CN103557992A - Method for detecting inner leakage of steam hydrophobic valve based on valve front pipe wall temperature detection - Google Patents
Method for detecting inner leakage of steam hydrophobic valve based on valve front pipe wall temperature detectionDownload PDFInfo
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及蒸汽疏水阀内漏检测技术，具体涉及一种基于阀前管壁温度检测的蒸汽疏水阀内漏检测方法。The invention relates to a steam trap internal leakage detection technology, in particular to a steam trap internal leakage detection method based on the temperature detection of the pipe wall in front of the valve.
背景技术Background technique
蒸汽供热工程、蒸汽动力发电厂中大量使用的蒸汽疏水阀，由于运行工况条件恶劣，阀门启闭操作日益频繁，导致阀门发生故障的因素多，阀门“跑、冒、滴、漏”现象时有发生。蒸汽疏水阀门一旦泄漏，不仅会导致设备性能下降，造成能量损失和经济损失，而且可在短时间内造成阀门损坏，对设备的安全构成严重威胁。目前，治理阀门泄漏是蒸汽热力工程企业节能降耗、提高设备运行安全性和稳定性的重要举措。The steam traps widely used in steam heating projects and steam power plants, due to the harsh operating conditions, the valve opening and closing operations are becoming more and more frequent. happens sometimes. Once the steam trap valve leaks, it will not only lead to equipment performance degradation, energy loss and economic loss, but also damage the valve in a short time, posing a serious threat to the safety of the equipment. At present, controlling valve leakage is an important measure for steam thermal engineering enterprises to save energy and reduce consumption, and improve the safety and stability of equipment operation.
阀门的泄漏可分为外漏和内漏。与外漏相比，阀门内漏一般较难发现，易造成突发的恶性事故。目前，常用的阀门内漏检测方法主要包括红外线测温法、超声波检测法、负压波法等，但这些方法均有其使用局限性。目前，工程领域中应用较多的蒸汽疏水阀门内漏诊断方法是温度诊断法，其基本原理是根据阀体及其与阀门连接的管道在运行过程中的温度变化规律，来判断阀门是否出现泄漏。蒸汽疏水阀门泄漏诊断一方面可利用对阀门在线监测所获得的阀门泄漏实时数据，定量诊断泄漏程度，预测发展趋势，并采取有效的维修和控制措施，减少维修费用和能量损失；另一方面可有效防止阀门泄漏故障引起的后果向相邻设备的扩展，提高企业生产的安全性和经济性。但是，由于介质工作参数、隔热层性能、阀门与管道系统结构等工况条件的差异，使得采用该方法判断阀门泄漏成为一项非常复杂的技术问题，误判断的情况屡屡发生，造成了严重的经济损失，给设备运行留下许多安全隐患。Valve leakage can be divided into external leakage and internal leakage. Compared with external leakage, internal leakage of valves is generally more difficult to find, and it is easy to cause sudden and vicious accidents. At present, the commonly used valve internal leakage detection methods mainly include infrared temperature measurement method, ultrasonic detection method, negative pressure wave method, etc., but these methods have their limitations. At present, the internal leakage diagnosis method of steam trap valves that is widely used in the engineering field is the temperature diagnosis method. Its basic principle is to judge whether the valve leaks according to the temperature change law of the valve body and the pipeline connected to the valve during operation. . On the one hand, the leakage diagnosis of steam trap valves can use the real-time data of valve leakage obtained from online monitoring of valves to quantitatively diagnose the degree of leakage, predict the development trend, and take effective maintenance and control measures to reduce maintenance costs and energy losses; on the other hand, it can Effectively prevent the expansion of the consequences caused by valve leakage failures to adjacent equipment, and improve the safety and economy of enterprise production. However, due to the differences in the working conditions of the medium, the performance of the heat insulation layer, the structure of the valve and the pipeline system, etc., it is a very complicated technical problem to use this method to judge the leakage of the valve. economic losses, leaving many safety hazards for equipment operation.
发明内容Contents of the invention
本发明要解决的技术问题是提供一种能够实现阀门内漏的定性及定量检测或者在线监测、内漏检测准确度高、检测速度快、应用范围广的基于阀前管壁温度检测的蒸汽疏水阀内漏检测方法。The technical problem to be solved by the present invention is to provide a steam drainage system based on the temperature detection of the pipe wall in front of the valve, which can realize the qualitative and quantitative detection or on-line monitoring of the internal leakage of the valve, the detection accuracy of the internal leakage is high, the detection speed is fast, and the application range is wide. Valve internal leakage detection method.
为了解决上述技术问题，本发明采用的技术方案为：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种基于阀前管壁温度检测的蒸汽疏水阀内漏检测方法，实施步骤如下：A steam trap internal leakage detection method based on the temperature detection of the pipe wall in front of the valve, the implementation steps are as follows:
1）分别根据式（1）计算出第一个代表点的正常管壁温度、第二个代表点的正常管壁温度，所述第一个代表点位于待检测蒸汽疏水阀前端的疏水管道上靠近待检测蒸汽疏水阀的位置，所述第二个代表点位于待检测蒸汽疏水阀前端的疏水管道上，且所述第二个代表点在疏水管道上位于第一个代表点的前端且与第一个代表点间距指定距离；1) Calculate the normal pipe wall temperature of the first representative point and the normal pipe wall temperature of the second representative point respectively according to formula (1), and the first representative point is located on the drain pipe at the front end of the steam trap to be tested Close to the position of the steam trap to be tested, the second representative point is located on the drain pipe at the front end of the steam trap to be tested, and the second representative point is located on the drain pipe at the front end of the first representative point and The first represents the specified distance between points;
tgb1=β0'+β1'1(P/Pcr)+β1'2(P/Pcr)2+β2'1(T/Tcr)+β2'2(T/Tcr)2tgb1 =β0 '+β1 '1 (P/Pcr )+β1 '2 (P/Pcr )2 +β2 '1 (T/Tcr )+β2 '2 (T/Tcr )2
+β3'1(L/Lmax)+β3'2(L/Lmax)2+β4'1(D/Dmax)+β4'2(D/Dmax)2 （1）+β3 '1 (L/Lmax )+β3 '2 (L/Lmax )2 +β4 '1 (D/Dmax )+β4 '2 (D/Dmax )2 (1)
+β5'1(hgb/hgb-max)+β5'2(hgb/hgb-max)2+β6'1(hbw/hbw-max)+β6'2(hbw/hbw-max)2+β5 '1 (hgb /hgb-max )+β5 '2 (hgb /hgb-max )2 +β6 '1 (hbw /hbw-max )+β6 '2 (hbw /hbw-max )2
+β7'1(ta/ta-max)+β7'2(ta/ta-max)2+ε'+β7 '1 (ta /ta-max )+β7 '2 (ta /ta-max )2 +ε'
式（1）中，tgb1表示第一个代表点或者第二个代表点的正常管壁温度，β0'、β1'1、β1'2……β'71、β'72表示计算管壁温度的拟合系数，ε'表示计算管壁温度的随机误差，P表示待检测蒸汽疏水阀前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L表示第一个代表点前端或者第二个代表点前端疏水管道的长度，Lmax表示同类型蒸汽疏水系统中疏水管道的最大长度，D表示待检测蒸汽疏水阀前端疏水管道的内径，Dmax表示同类型蒸汽疏水系统中疏水管道最大管道内径，hgb表示待检测蒸汽疏水阀前端疏水管道的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道管壁最大厚度，hbw表示待检测蒸汽疏水阀前端疏水管道的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道的保温层最大厚度，ta表示待检测蒸汽疏水阀前端疏水管道的环境温度，ta-max表示同类型蒸汽疏水系统中蒸汽疏水阀前端疏水管道的环境最大温度；In formula (1), tgb1 represents the normal tube wall temperature of the first representative point or the second representative point, β0 ', β1 '1 , β1 '2 ... β'71 , β'72 represent the calculated The fitting coefficient of the pipe wall temperature, ε' represents the random error in calculating the pipe wall temperature, P represents the steam pressure conveyed in the pipe at the front end of the steam trap to be tested, Pcr represents the critical pressure of the steam, and T represents the steam trap to be tested The temperature of the steam transported in the pipeline at the front end, Tcr represents the critical temperature of the steam, L represents the length of the drain pipe at the front end of the first representative point or the front end of the second representative point, Lmax represents the maximum value of the drain pipe in the same type of steam drain system Length, D represents the internal diameter of the drain pipe at the front end of the steam trap to be tested, Dmax represents the maximum internal diameter of the drain pipe in the same type of steam trap system, hgb represents the wall thickness of the drain pipe at the front end of the steam trap to be tested, hgb-max Indicates the maximum thickness of the drain pipe wall in the same type of steam trap system, hbw represents the thickness of the thermal insulation layer of the drain pipe at the front end of the steam trap to be tested, hbw-max represents the maximum thickness of the thermal insulation layer of the drain pipe in the same type of steam trap system, ta represents the ambient temperature of the drain pipe at the front end of the steam trap to be tested, and ta-max represents the maximum ambient temperature of the drain pipe at the front end of the steam trap in the same type of steam trap system;
2）分别检测第一个代表点、第二个代表点的管壁温度，根据第一个代表点的实测管壁温度、第一个代表点的正常管壁温度计算出第一个代表点的实测温度升高值，根据第二个代表点的实测管壁温度、第二个代表点的正常管壁温度计算出第二个代表点的实测温度升高值；根据第一个代表点的实测管壁温度、第二个代表点的实测管壁温度计算出第一个代表点、第二个代表点之间的实测温度差值；2) Detect the tube wall temperature of the first representative point and the second representative point respectively, and calculate the measured value of the first representative point according to the measured tube wall temperature of the first representative point and the normal tube wall temperature of the first representative point Temperature rise value, calculate the measured temperature rise value of the second representative point according to the measured pipe wall temperature of the second representative point and the normal pipe wall temperature of the second representative point; according to the measured pipe wall temperature of the first representative point Calculate the measured temperature difference between the first representative point and the second representative point;
3）分别指定微漏、一般内漏或者严重内漏的泄漏量阈值；分别根据式（2）计算出第一个代表点或第二个代表点分别在微漏泄漏量阈值的最大泄漏量下的第一温度临界值，根据式（3）计算出第一个代表点或第二个代表点分别在严重泄漏量阈值的最小泄漏量下的第二温度临界值；3) Designate the leakage thresholds of micro-leakage, general internal leakage or serious internal leakage respectively; calculate the first representative point or the second representative point under the maximum leakage value of the micro-leakage leakage threshold respectively according to formula (2) Calculate the first temperature critical value according to the formula (3) and calculate the second temperature critical value of the first representative point or the second representative point respectively under the minimum leakage of the serious leakage threshold;
tgb2-G100=β0''+β1''1(P/Pcr)+β1''2(P/Pcr)2+β2''1(T/Tcr)+β2''2(T/Tcr)2tgb2-G100 =β0 ''+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β2 ''1 (T/Tcr )+β2 ''2 (T/Tcr )2
+β3''1(L/Lmax)+β3''2(L/Lmax)2+β4''1(D/Dmax)+β4''2(D/Dmax)2 （2）+β3 ''1 (L/Lmax )+β3 ''2 (L/Lmax )2 +β4 ''1 (D/Dmax )+β4 ''2 (D/Dmax )2 (2)
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β6''1(hbw/hbw-max)+β6''2(hbw/hbw-max)2+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β6 ''1 (hbw /hbw-max )+β6 ''2 (hbw /hbw-max )2
+β7''1G1+β7''2G12+β7''3G13+ε''+β7 ''1 G1 +β7 ''2 G12 +β7 ''3 G13 +ε''
tgb3-G500=β0'''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β'2''1(T/Tcr)+β'2''2(T/Tcr)2tgb3-G500 =β0 '''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β'2 ''1 (T/Tcr ) +β'2 ''2 (T/Tcr )2
+β3'''1(L/Lmax)+β3'''2(L/Lmax)2+β4'''1(D/Dmax)+β4'''2(D/Dmax)2 （3）+β3 '''1 (L/Lmax )+β3 '''2 (L/Lmax )2 +β4 '''1 (D/Dmax )+β4 '''2 (D/ Dmax )2 (3)
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β6'''1(hbw/hbw-max)+β6'''2(hbw/hbw-max)2+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β6 '''1 (hbw /hbw-max )+ β6 '''2 (hbw /hbw-max )2
+β7'''1G2+β7'''2G22+β'7''3G23+ε'''+β7 '''1 G2 +β7 '''2 G22 +β'7 ''3 G23 +ε'''
式（2）和式（3）中，tgb2-G100表示第一个代表点或第二个代表点分别在微漏泄漏量阈值的最大泄漏量下的第一温度临界值；tgb3-G500表示第一个代表点或第二个代表点分别在严重泄漏量阈值的最小泄漏量下的第二温度临界值；β0''、β1''1、β1''2、……β'7'1、β'7'2、β'7'3分别表示计算管壁温度的拟合系数、ε''表示计算管壁温度的随机误差，β0'''、β1'''1、β1'''2、……β'7''1、β'7''2、β'7'3分别表示计算管壁温度的拟合系数，ε'''表示计算管壁温度的随机误差，P表示待检测蒸汽疏水阀前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L表示第一个代表点前端或者第二个代表点前端疏水管道的长度，Lmax表示同类型蒸汽疏水系统中疏水管道的最大长度，D表示待检测蒸汽疏水阀前端疏水管道的内径，Dmax表示同类型蒸汽疏水系统中疏水管道最大管道内径，hgb表示待检测蒸汽疏水阀前端疏水管道的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道管壁最大厚度，hbw表示待检测蒸汽疏水阀前端疏水管道的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道的保温层最大厚度，G1代表微漏泄漏量阈值的最大泄漏量，G2代表严重泄漏量阈值的最小泄漏量；In formula (2) and formula (3), tgb2-G100 represents the first temperature critical value of the first representative point or the second representative point respectively at the maximum leakage of micro-leakage threshold; tgb3-G500 Indicates the second temperature critical value of the first representative point or the second representative point respectively under the minimum leakage of the serious leakage threshold; β0 '', β1 ''1 , β1 ''2 , ... β '7 '1 , β'7 '2 , β'7 '3 denote the fitting coefficients of the calculated tube wall temperature, ε'' denotes the random error of the calculated tube wall temperature, β0 ''', β1 '''1 , β1 '''2 , ... β'7 ''1 , β'7 ''2 , β'7 '3 respectively represent the fitting coefficients for calculating the tube wall temperature, ε''' denotes the calculated tube wall temperature P represents the steam pressure delivered in the pipeline at the front end of the steam trap to be tested, Pcr indicates the critical pressure of the steam, T indicates the temperature of the steam delivered in the pipeline at the front end of the steam trap to be tested, and Tcr indicates the critical value of the steam Temperature, L represents the length of the drain pipe at the front end of the first representative point or the front end of the second representative point, Lmax represents the maximum length of the drain pipe in the same type of steam trap system, D represents the inner diameter of the drain pipe at the front end of the steam trap to be tested, Dmax represents the maximum inner diameter of the drain pipe in the same type of steam trap system, hgb represents the pipe wall thickness of the drain pipe at the front end of the steam trap to be tested, hgb-max represents the maximum thickness of the drain pipe wall in the same type of steam drain system, hbw represents the thickness of the thermal insulation layer of the drain pipe at the front end of the steam trap to be tested, hbw-max represents the maximum thickness of the thermal insulation layer of the drain pipe in the same type of steam trap system, G1 represents the maximum leakage of the microleakage threshold, and G2 represents The minimum leakage volume for the serious leakage volume threshold;
4）选择第一个代表点的实测管壁温度或者第二个代表点的实测管壁温度作为泄漏状态判定管壁温度，在泄漏状态判定管壁温度大于所选择代表点的正常管壁温度的前提下，将泄漏状态判定管壁温度减去所选择代表点的正常管壁温度得到的温度差值，然后根据所述温度差值判断蒸汽疏水阀的泄漏状态，如果满足式（4）则判定泄漏状态处于微漏状态，如果满足式（5）则判定泄漏状态处于一般内漏状态，如果满足式（6）则判定泄漏状态处于严重内漏状态；如果不满足式（4）、式（5）、式（6）中的任意一个，则判定待检测蒸汽疏水阀未发生泄漏并结束检测或者返回执行步骤2）；4) Select the actual measured pipe wall temperature of the first representative point or the actual measured pipe wall temperature of the second representative point as the leakage state to determine the pipe wall temperature, and determine the pipe wall temperature in the leakage state is greater than the normal pipe wall temperature of the selected representative point Under the premise, the leakage state is determined by subtracting the temperature difference obtained by subtracting the normal pipe wall temperature of the selected representative point from the leakage state, and then judging the leakage state of the steam trap according to the temperature difference. If formula (4) is satisfied, then the The leakage state is in the state of micro-leakage. If formula (5) is satisfied, it is judged that the leakage state is in the state of general internal leakage. If formula (6) is satisfied, the leakage state is judged to be in the state of serious internal leakage; ), formula (6), then it is judged that the steam trap to be tested has no leakage and ends the test or returns to step 2);
△ts≤tgb2-G100-tgb1 （4）△ts ≤tgb2-G100 -tgb1 (4)
tgb2-G100-tgb1<△ts≤tgb3-G500-tgb1 （5）tgb2-G100 -tgb1 <△ts ≤tgb3-G500 -tgb1 (5)
△ts>tgb3-G500-tgb1 （6）△ts >tgb3-G500 -tgb1 (6)
式（4）、式（5）和式（6）中，△ts表示泄漏状态判定管壁温度减去第一个代表点或者第二个代表点的正常管壁温度得到的温度差值，tgb2-G100表示第一温度临界值；tgb3-G500表示第二温度临界值，tgb1表示第一个代表点或者第二个代表点的正常管壁温度；分别将第一个代表点或者第二个代表点作为当前代表点，跳转执行下一步；In formula (4), formula (5) and formula (6), △ ts represents the temperature difference obtained by subtracting the normal pipe wall temperature of the first representative point or the second representative point from the leakage state determination pipe wall temperature, tgb2-G100 represents the first temperature critical value; tgb3-G500 represents the second temperature critical value, tgb1 represents the normal pipe wall temperature of the first representative point or the second representative point; The second representative point is used as the current representative point, jump to the next step;
5）根据判定得到的当前泄漏状态设置一个假定泄漏量，如果当前泄漏状态为微漏，则根据式（7）计算得到当前代表点在假定泄漏量下对应的温度理论升高值，如果当前泄漏状态为一般内漏，则根据式（8）计算得到当前代表点在假定泄漏量下对应的温度理论升高值，如果当前泄漏状态为严重内漏，则根据式（9）计算得到当前代表点在假定泄漏量下对应的温度理论升高值；5) Set a hypothetical leakage amount according to the current leakage state determined. If the current leakage state is a microleakage, then calculate the theoretical temperature rise value corresponding to the current representative point under the assumed leakage amount according to formula (7). If the current leakage If the state is general internal leakage, then calculate the theoretical temperature rise value corresponding to the current representative point under the assumption of leakage according to formula (8); if the current leakage state is serious internal leakage, then calculate the current representative point according to formula (9) The corresponding theoretical temperature rise value under the assumption of leakage;
△t1=(β'0'+β1''1(P/Pcr)+β1''2(P/Pcr)2+β'2'1(T/Tcr)+β'2'2(T/Tcr)2△t1 =(β'0 '+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β'2 '1 (T/Tcr )+β'2 '2 (T/Tcr )2
+β3''1(L/Lmax)+β3''2(L/Lmax)2+β'4'1(D/Dmax)+β'4'2(D/Dmax)2+β3 ''1 (L/Lmax )+β3 ''2 (L/Lmax )2 +β'4 '1 (D/Dmax )+β'4 '2 (D/Dmax )2
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β'6'1(hbw/hbw-max)+β'6'2(hbw/hbw-max)2 （7）+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β'6 '1 (hbw /hbw-max )+β'6 '2 (hbw /hbw-max )2 (7)
+β'7'1G+β'7'2G2+β'7'3G3+ε'')-tgb1+β'7 '1 G+β'7 '2 G2 +β'7 '3 G3 +ε'')-tgb1
△t2=(β'0''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β'2''1(T/Tcr)+β'2''2(T/Tcr)2△t2 =(β'0''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β'2 ''1 (T/Tcr ) +β'2 ''2 (T/Tcr )2
+β3'''1(L/Lmax)+β3'''2(L/Lmax)2+β'4''1(D/Dmax)+β'4''2(D/Dmax)2+β3 '''1 (L/Lmax )+β3 '''2 (L/Lmax )2 +β'4 ''1 (D/Dmax )+β'4 ''2 (D/ Dmax )2
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β'6''1(hbw/hbw-max)+β'6''2(hbw/hbw-max)2 （8）+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β'6 ''1 (hbw /hbw-max )+ β'6 ''2 (hbw /hbw-max )2 (8)
+β'7''1G+β'7''2G2+β'7''3G3+ε''')-tgb1+β'7 ''1 G+β'7 ''2 G2 +β'7 ''3 G3 +ε''')-tgb1
△t3=(β'0'''+β1'''1'(P/Pcr)+β1''''2(P/Pcr)2+β'2'''1(T/Tcr)+β'2'''2(T/Tcr)2△t3 =(β'0 '''+β1 '''1 '(P/Pcr )+β1 ''''2 (P/Pcr )2 +β'2 '''1 (T /Tcr )+β'2 '''2 (T/Tcr)2
+β3''''1(L/Lmax)+β3''''2(L/Lmax)2+β'4'''1(D/Dmax)+β'4'''2(D/Dmax)2 （9）+β3 ''''1 (L/Lmax )+β3 ''''2 (L/Lmax )2 +β'4 '''1 (D/Dmax )+β'4 '''2 (D/Dmax )2 (9)
+β5''''1(hbw/hbw-max)+β5''''2(hbw/hbw-max)2+β'6'''1G+β'6'''2G2+ε'''')-tgb1+β5 ''''1 (hbw /hbw-max )+β5 ''''2 (hbw /hbw-max )2 +β'6 '''1 G+β'6 '''2 G2 +ε'''')-tgb1
式（7）、式（8）和式（9）中，△t1表示微漏情况下假定泄漏量对应的当前代表点的温度理论升高值，△t2表示一般内漏情况下假定泄漏量对应的当前代表点的温度理论升高值，△t3表示严重内漏情况下假定泄漏量对应的当前代表点的温度理论升高值，β0''、β1''1、β1''2、……β'7'1、β'7'2、β'7'3分别表示计算管壁温度的拟合系数，ε''表示计算管壁温度的随机误差；β0'''、β1'''1、β1'''2、……β'7''1、β'7''2、β7''3'分别表示计算管壁温度的拟合系数，ε'''表示计算管壁温度的随机误差；β0''''、β1''1''、β1''2''……β6'''1'、β6'''2'分别表示计算管壁温度的拟合系数，ε''''表示计算管壁温度的随机误差；P表示待检测蒸汽疏水阀前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L表示第一个代表点前端或者第二个代表点前端疏水管道的长度，Lmax表示同类型蒸汽疏水系统中疏水管道的最大长度，D表示待检测蒸汽疏水阀前端疏水管道的内径，Dmax表示同类型蒸汽疏水系统中疏水管道最大管道内径，hgb表示待检测蒸汽疏水阀前端疏水管道的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道管壁最大厚度，hbw表示待检测蒸汽疏水阀前端疏水管道的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道的保温层最大厚度，G表示假定泄漏量；tgb1表示当前代表点的正常管壁温度；In formula (7), formula (8) and formula (9), △t1 represents the theoretical temperature rise value of the current representative point corresponding to the assumed leakage amount in the case of micro-leakage, and △t2 represents the assumed leakage value in the case of general internal leakage △t3 represents the theoretical temperature rise value of the current representative point corresponding to the assumed leakage in the case of severe internal leakage, β0 '', β1 ''1 , β1 ''2 , ... β'7 '1 , β'7 '2 , β'7 '3 represent the fitting coefficients for calculating the tube wall temperature respectively, ε'' denotes the random error for calculating the tube wall temperature; β0 ''', β1 '''1 , β1 '''2 , ... β'7 ''1 , β'7 ''2 , β7 ''3 'represent the fitting coefficients for calculating the tube wall temperature, ε' '' indicatesthe randomerrorof calculatingthetubewalltemperature; 'represents the fitting coefficient of the calculated pipe wall temperature, ε''''represents the random error of the calculated pipe wall temperature; P represents the steam pressure transported in the pipeline at the front end of the steam trap to be tested, Pcr represents the critical pressure of the steam, T represents the temperature of the steam transported in the pipeline at the front end of the steam trap to be tested, Tcr represents the critical temperature of the steam, L represents the length of the drain pipe at the front end of the first representative point or the front end of the second representative point, and Lmax represents the same type of steam The maximum length of the drain pipe in the drain system, D is the inner diameter of the drain pipe at the front end of the steam trap to be tested, Dmax is the maximum inner diameter of the drain pipe in the same type of steam drain system, hgb is the diameter of the drain pipe at the front end of the steam trap to be tested Wall thickness, hgb-max represents the maximum thickness of the pipe wall of the drain pipe in the same type of steam drain system, hbw represents the thickness of the insulation layer of the drain pipe at the front end of the steam trap to be tested, hbw-max represents the drain pipe in the same type of steam drain system The maximum thickness of the insulation layer, G represents the assumed leakage; tgb1 represents the normal pipe wall temperature of the current representative point;
6）判断当前代表点在假定泄漏量下对应的温度理论升高值是否满足条件式（10），如果不能满足条件式（10）则返回重新迭代执行步骤5）；如果满足条件式（10）则将假定泄漏量作为当前代表点对应的泄漏量，当得到第一个代表点或者第二个代表点对应的泄漏量后跳转执行步骤7）；6) Judging whether the theoretical temperature increase value corresponding to the current representative point under the assumed leakage rate satisfies the conditional formula (10), if the conditional formula (10) cannot be satisfied, return to step 5) for re-iteration; if the conditional formula (10) is satisfied Then assume the leakage amount as the leakage amount corresponding to the current representative point, and jump to step 7 after getting the leakage amount corresponding to the first representative point or the second representative point);
|△tjd-△ts|/△ts≤0.1% （10）|△tjd -△ ts |/△ts≤0.1 % (10)
式（10）中，△tjd表示当前代表点在假定泄漏量下对应的温度理论升高值，△ts表示当前代表点的实测温度升高值；In formula (10), △tjd represents the theoretical temperature rise value corresponding to the current representative point under the assumption of leakage, and △ts represents the measured temperature rise value of the current representative point;
7）根据判定得到的当前泄漏状态设置一个假定泄漏量，如果当前泄漏状态为微漏，则根据式（11）计算得到第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值；如果当前泄漏状态为一般内漏，则根据式（12）计算得到第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，如果当前泄漏状态为严重内漏，则根据式（13）计算得到第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值；7) Set a hypothetical leakage amount according to the current leakage state obtained from the judgment. If the current leakage state is microleakage, calculate according to formula (11) to obtain the assumed leakage amount between the first representative point and the second representative point. Theoretical temperature difference; if the current leakage state is general internal leakage, then calculate the theoretical temperature difference between the first representative point and the second representative point under the assumed leakage amount according to formula (12), if the current leakage state If it is serious internal leakage, calculate the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage according to formula (13);
δt1=[β0''+β1''1(P/Pcr)+β1''2(P/Pcr)2+β2''1(T/Tcr)+β2''2(T/Tcr)2δt1 =[β0 ''+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β2 ''1 (T/Tcr )+β2 ''2 (T/Tcr )2
+β3''1(L1/Lmax)+β3''2(L1/Lmax)2+β'4'1(D/Dmax)+β'4'2(D/Dmax)2+β3 ''1 (L1 /Lmax )+β3 ''2 (L1 /Lmax )2 +β'4 '1 (D/Dmax )+β'4 '2 (D/Dmax )2
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β6''1(hbw/hbw-max)+β6''2(hbw/hbw-max)2+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β6 ''1 (hbw /hbw-max )+β6 ''2 (hbw /hbw-max )2
+β7''1G+β7''2G2+β7''3G3+ε''] （11）+β7 ''1 G+β7 ''2 G2 +β7 ''3 G3 +ε''] (11)
-[β0''+β1''1(P/Pcr)+β1''2(P/Pcr)2+β2''1(T/Tcr)+β2''2(T/Tcr)2-[β0 ''+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β2 ''1 (T/Tcr )+β2 ''2 ( T/Tcr )2
+β3''1(L2/Lmax)+β3''2(L2/Lmax)2+β4''1(D/Dmax)+β4''2(D/Dmax)2+β3 ''1 (L2 /Lmax )+β3 ''2 (L2 /Lmax )2 +β4 ''1 (D/Dmax )+β4 ''2 (D/Dmax )2
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β6''1(hbw/hbw-max)+β6''2(hbw/hbw-max)2+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β6 ''1 (hbw /hbw-max )+β6 ''2 (hbw /hbw-max )2
+β7''1G+β7''2G2+β7''3G3+ε'']+β7 ''1 G+β7 ''2 G2 +β7 ''3 G3 +ε'']
δt2=[β0'''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β2'''1(T/Tcr)+β2'''2(T/Tcr)2δt2 =[β0 '''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β2 '''1 (T/Tcr )+ β2 '''2 (T/Tcr )2
+β3'''1(L1/Lmax)+β3'''2(L1/Lmax)2+β4'''1(D/Dmax)+β4'''2(D/Dmax)2+β3 '''1 (L1 /Lmax )+β3 '''2 (L1 /Lmax )2 +β4 '''1 (D/Dmax )+β4 '''2 ( D/Dmax )2
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β6'''1(hbw/hbw-max)+β6'''2(hbw/hbw-max)2+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β6 '''1 (hbw /hbw-max )+ β6 '''2 (hbw /hbw-max )2
+β7'''1G+β7'''2G2+β'7''3G3+ε'''] （12）+β7 '''1 G+β7 '''2 G2 +β'7 ''3 G3 +ε'''] (12)
-[β0'''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β2'''1(T/Tcr)+β2'''2(T/Tcr)2-[β0 '''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β2 '''1 (T/Tcr )+β2 '''2 (T/Tcr )2
+β3'''1(L2/Lmax)+β3'''2(L2/Lmax)2+β'4''1(D/Dmax)+β4'''2(D/Dmax)2+β3 '''1 (L2 /Lmax )+β3 '''2 (L2 /Lmax )2 +β'4 ''1 (D/Dmax )+β4 '''2 ( D/Dmax )2
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β6'''1(hbw/hbw-max)+β6'''2(hbw/hbw-max)2+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β6 '''1 (hbw /hbw-max )+ β6 '''2 (hbw /hbw-max )2
+β7'''1G+β7'''2G2+β'7''3G3+ε''']+β7 '''1 G+β7 '''2 G2 +β'7 ''3 G3 +ε''']
δt3=[β0''''+β1'''1'(P/Pcr)+β1'''2'(P/Pcr)2+β2''''1(T/Tcr)+β2''''2(T/Tcr)2δt3 =[β0 ''''+β1 '''1 '(P/Pcr )+β1 '''2 '(P/Pcr )2 +β2 ''''1 (T/ Tcr )+β2 ''''2 (T/Tcr )2
+β3''''1(L1/Lmax)+β3''''2(L1/Lmax)2+β'4'''1(D/Dmax)+β'4'''2(D/Dmax)2+β3 ''''1 (L1 /Lmax )+β3 ''''2 (L1 /Lmax )2 +β'4 '''1 (D/Dmax )+β'4 '''2 (D/Dmax )2
+β5''''1(hbw/hbw-max)+β5''''2(hbw/hbw-max)2+β6''''1G+β6''''2G2+ε'''']（13）+β5 ''''1 (hbw /hbw-max )+β5 ''''2 (hbw /hbw-max )2 +β6 ''''1 G+β6 ''''2 G2 +ε''''] (13)
-[β0''''+β1'''1'(P/Pcr)+β1'''2'(P/Pcr)2+β2''''1(T/Tcr)+β2''''2(T/Tcr)2-[β0 ''''+β1 '''1 '(P/Pcr )+β1 '''2 '(P/Pcr )2 +β2 ''''1 (T/Tcr )+β2 ''''2 (T/Tcr )2
+β3''''1(L2/Lmax)+β3''''2(L2/Lmax)2+β4''''1(D/Dmax)+β4''''2(D/Dmax)2+β3 ''''1 (L2 /Lmax )+β3 ''''2 (L2 /Lmax )2 +β4 ''''1 (D/Dmax )+β4 ''''2 (D/Dmax )2
+β5''''1(hbw/hbw-max)+β5''''2(hbw/hbw-max)2+β6''''1G+β6''''2G2+ε'''']+β5 ''''1 (hbw /hbw-max )+β5 ''''2 (hbw /hbw-max )2 +β6 ''''1 G+β6 ''''2 G2 +ε'''']
式（11）、式（12）和式（13）中，δt1表示微漏情况下第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，δt2表示一般泄漏情况下第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，δt3表示严重泄漏情况下第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，β0''、β1''1、β1''2、……β'7'1、β'7'2、β'7'3分别表示计算管壁温度的拟合系数，ε''表示计算管壁温度的随机误差；β0'''、β1'''1、β1'''2、……β'7''1、β'7''2、β7''3'分别表示计算管壁温度的拟合系数，ε'''表示计算管壁温度的随机误差；β0''''、β1''1''、β1''2''……β6'''1'、β6'''2'分别表示计算管壁温度的拟合系数，ε''''表示计算管壁温度的随机误差；P表示待检测蒸汽疏水阀前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L1表示第一个代表点前段疏水管道的长度，L2表示第二个代表点前段疏水管道的长度，Lmax表示同类型蒸汽疏水系统中疏水管道的最大长度，D表示待检测蒸汽疏水阀前端疏水管道的内径，Dmax表示同类型蒸汽疏水系统中疏水管道最大管道内径，hgb表示待检测蒸汽疏水阀前端疏水管道的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道管壁最大厚度，hbw表示待检测蒸汽疏水阀前端疏水管道的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道的保温层最大厚度，G表示假定泄漏量；In Equation (11), Equation (12) and Equation (13), δt1 represents the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage in the case of microleakage, and δt2 represents In the case of general leakage, the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage, δt3 represents the temperature difference between the first representative point and the second representative point in the case of serious leakage Theoretical temperature difference under leakage, β0 '', β1 ''1 , β1 ''2 , ... β'7 '1 , β'7 '2 , β'7 '3 respectively represent the calculated pipe wall The fitting coefficient of temperature, ε'' represents the random error in calculating the tube wall temperature; β0 ''', β1 '''1 , β1 '''2 ,... β'7 ''1 , β'7 ''2 , β7 ''3 'represent the fitting coefficients of the calculated tube wall temperature, ε'''represents the random error of the calculated tube wall temperature; β0 '''', β1 ''1 '', β1 ''2 ''... β6 '''1 ', β6 '''2 ' represent the fitting coefficients for calculating the tube wall temperature respectively, ε'''' represent the random error in calculating the tube wall temperature; P represents The pressure of the steam transported in the pipeline at the front end of the steam trap to be detected, Pcr represents the critical pressure of the steam, T represents the temperature of the steam transported in the pipeline at the front end of the steam trap to be detected, Tcr represents the critical temperature of the steam, L1 represents the first One represents the length of the drain pipe in front of the point, L2 represents the length of the drain pipe in the front of the second point, Lmax represents the maximum length of the drain pipe in the same type of steam trap system, and D represents the inner diameter of the drain pipe at the front end of the steam trap to be tested , Dmax represents the maximum inner diameter of the drain pipe in the same type of steam trap system, hgb represents the pipe wall thickness of the drain pipe at the front end of the steam trap to be tested, hgb-max represents the maximum thickness of the drain pipe wall in the same type of steam trap system, hbw represents the thickness of the thermal insulation layer of the drain pipe at the front end of the steam trap to be tested, hbw-max represents the maximum thickness of the thermal insulation layer of the drain pipe in the same type of steam trap system, and G represents the assumed leakage;
8）判定第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值与第一个代表点、第二个代表点之间的实测温度差值是否满足式（14），如果满足式（14）则将当前的假定泄漏量作为第一个代表点、第二个代表点之间温度差值对应的泄漏量，跳转执行步骤9），否则跳转执行步骤7）重新假定泄漏量以确定第一个代表点、第二个代表点之间温度差值对应的泄漏量；8) Determine whether the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage and the measured temperature difference between the first representative point and the second representative point satisfy the formula (14 ), if formula (14) is satisfied, the current assumed leakage is taken as the leakage corresponding to the temperature difference between the first representative point and the second representative point, and skip to step 9), otherwise, skip to step 7 ) Re-assume the leakage to determine the leakage corresponding to the temperature difference between the first representative point and the second representative point;
|δjd-δs|/δs≤0.1% （14）|δjd -δs |/δs≤0.1 % (14)
式（14）中，δjd表示第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，δs表示第一个代表点、第二个代表点之间的实测温度差值；In formula (14), δjd represents the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage, and δs represents the temperature difference between the first representative point and the second representative point Measured temperature difference;
9）根据第一个代表点对应的泄漏量、第二个代表点对应的泄漏量以及第一个代表点、第二个代表点之间温度差值对应的泄漏量三者中选择一个作为待检测蒸汽疏水阀的最终内漏泄漏量输出。9) According to the leakage amount corresponding to the first representative point, the leakage amount corresponding to the second representative point, and the leakage amount corresponding to the temperature difference between the first representative point and the second representative point, select one as the target Detects the final internal leakage output of steam traps.
进一步地，所述步骤9）实施步骤如下：判断第一个代表点对应的泄漏量、第二个代表点对应的泄漏量以及第一个代表点、第二个代表点之间温度差值对应的泄漏量三者是否满足式（15），如果满足式（15），则从所述第一个代表点对应的泄漏量、第二个代表点对应的泄漏量以及第一个代表点、第二个代表点之间温度差值对应的泄漏量中任意选择一个作为待检测蒸汽疏水阀的最终内漏泄漏量输出；否则将第一个代表点对应的泄漏量作为待检测蒸汽疏水阀的最终内漏泄漏量输出；Further, the implementation steps of step 9) are as follows: determine the leakage amount corresponding to the first representative point, the leakage amount corresponding to the second representative point, and the corresponding temperature difference between the first representative point and the second representative point Whether the leakage amount of the three satisfies the formula (15), if it satisfies the formula (15), then from the leakage amount corresponding to the first representative point, the leakage amount corresponding to the second representative point and the first representative point, the second representative point Any one of the leakage corresponding to the temperature difference between the two representative points is selected as the final internal leakage output of the steam trap to be tested; otherwise, the leakage corresponding to the first representative point is used as the final internal leakage of the steam trap to be tested Internal leakage output;
|G11-G12|/G11≤1%且|G11-G13|/G11≤1% （15）|G11 -G12 |/G11 ≤1% and |G11 -G13 |/G11 ≤1% (15)
式（15）中，G11表示第一个代表点对应的泄漏量，G12表示第二个代表点对应的泄漏量，G13表示第一个代表点、第二个代表点之间温度差值对应的泄漏量。In formula (15), G11 represents the leakage amount corresponding to the first representative point, G12 represents the leakage amount corresponding to the second representative point, and G13 represents the temperature difference between the first representative point and the second representative point The value corresponds to the amount of leakage.
本发明基于阀前管壁温度检测的蒸汽疏水阀内漏检测方法具有下述优点：The steam trap internal leakage detection method based on the detection of the pipe wall temperature in front of the valve has the following advantages:
1、本发明计算代表点的正常管壁温度、判断蒸汽疏水阀的泄漏状态、计算代表点在假定泄漏量下对应的温度理论升高值、计算得到第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值时，上述计算都建立在蒸汽疏水系统的通用物理模型的基础上，综合考虑了待检测蒸汽疏水阀前端的管道内输送的蒸汽压力、蒸汽的临界压力、待检测蒸汽疏水阀前端的管道内输送的蒸汽温度、蒸汽的临界压力、代表点前端疏水管道的长度、疏水管道的最大长度、待检测蒸汽疏水阀前端疏水管道的内径、疏水管道最大管道内径、待检测蒸汽疏水阀前端疏水管道的管壁厚度、疏水管道管壁最大厚度、待检测蒸汽疏水阀前端疏水管道的保温层厚度、疏水管道的保温层最大厚度、待检测蒸汽疏水阀前端疏水管道的环境温度、蒸汽疏水阀前端疏水管道的环境最大温度，依据蒸汽、汽水混合物、水的流动和传热过程特点，综合了理论计算方法和实际的温度检测，利用理论计算方法获得阀门泄漏工况诊断的参考温度点和温升幅值标准，为泄漏工况诊断提供理论依据，能够及时准确地反映出阀门泄漏的情况，不仅可以根据阀门运行状态安排检修，避免目前电厂计划性停机检修，而且减少了发电厂阀门流量，降低了运行供电耗煤，提高了火电厂运行经济性；而且泄漏量的定量检测为汽轮机热耗实验提供了参考依据，能够可克服复杂疏水管道系统中相互影响问题，能够实现阀门内漏的定性及定量检测或者在线监测，具有内漏检测准确度高、检测速度快、应用范围广的优点。1. The present invention calculates the normal pipe wall temperature of the representative point, judges the leakage state of the steam trap, calculates the theoretical temperature rise value corresponding to the representative point under the assumption of leakage, and calculates the first representative point and the second representative point The above calculations are based on the general physical model of the steam trap system, taking into account the steam pressure transported in the pipeline at the front end of the steam trap to be tested and the critical value of the steam. Pressure, temperature of steam transported in the pipeline at the front end of the steam trap to be tested, critical pressure of the steam, length of the drainage pipeline at the front end of the representative point, maximum length of the drainage pipeline, inner diameter of the drainage pipeline at the front end of the steam trap to be tested, and the maximum diameter of the drainage pipeline Inner diameter, pipe wall thickness of the drain pipe at the front end of the steam trap to be tested, the maximum thickness of the pipe wall of the drain pipe, the thickness of the insulation layer of the drain pipe at the front end of the steam trap to be tested, the maximum thickness of the insulation layer of the drain pipe, and the front end of the steam trap to be tested The ambient temperature of the pipeline and the maximum ambient temperature of the drain pipe at the front end of the steam trap are based on the characteristics of steam, steam-water mixture, water flow and heat transfer process, and the theoretical calculation method and actual temperature detection are integrated, and the valve leakage work is obtained by using the theoretical calculation method. The reference temperature point and temperature rise amplitude standard for condition diagnosis provide a theoretical basis for leakage condition diagnosis, which can timely and accurately reflect the valve leakage situation, not only can arrange maintenance according to the valve operating status, avoid the current planned shutdown of power plants for maintenance, Moreover, the valve flow rate of the power plant is reduced, the coal consumption of the power supply is reduced, and the operation economy of the thermal power plant is improved; and the quantitative detection of the leakage provides a reference for the heat consumption experiment of the steam turbine, which can overcome the mutual influence problem in the complex drainage pipeline system , can realize the qualitative and quantitative detection or online monitoring of the internal leakage of the valve, and has the advantages of high accuracy of internal leakage detection, fast detection speed and wide application range.
2、本发明根据第一个代表点对应的泄漏量、第二个代表点对应的泄漏量以及第一个代表点、第二个代表点之间温度差值对应的泄漏量三者选择一个作为待检测蒸汽疏水阀的最终内漏泄漏量输出，不论是热源靠近某一个代表点，还是热源同时靠近两个代表点，本发明通过上述方式均可以排除热源对阀门内漏检测的影响，使得阀门内漏检测准确可靠。2. The present invention selects one of the three as the leakage amount corresponding to the first representative point, the leakage amount corresponding to the second representative point, and the leakage amount corresponding to the temperature difference between the first representative point and the second representative point. The output of the final internal leakage of the steam trap to be detected, whether the heat source is close to a certain representative point or the heat source is close to two representative points at the same time, the present invention can eliminate the influence of the heat source on the internal leakage detection of the valve through the above method, so that the valve The internal leakage detection is accurate and reliable.
附图说明Description of drawings
图1为本发明实施例的基本方法流程示意图。FIG. 1 is a schematic flowchart of a basic method of an embodiment of the present invention.
图2为应用本实施例方法的蒸汽疏水系统的结构示意图。Fig. 2 is a schematic structural view of the steam drainage system applying the method of this embodiment.
图3为本发明实施例中判断泄漏状态的流程示意图。Fig. 3 is a schematic flow chart of judging a leakage state in an embodiment of the present invention.
图4为本发明实施例中计算代表点对应的泄漏量的流程示意图。Fig. 4 is a schematic flow chart of calculating the leakage amount corresponding to the representative point in the embodiment of the present invention.
图5为本发明实施例中计算第一个代表点、第二个代表点之间温度差值对应的泄漏量的流程示意图。Fig. 5 is a schematic flowchart of calculating the leakage corresponding to the temperature difference between the first representative point and the second representative point in the embodiment of the present invention.
图6为本发明实施例中选择一个泄漏量作为待检测蒸汽疏水阀的最终内漏泄漏量输出的流程示意图。Fig. 6 is a schematic flowchart of selecting a leakage amount as the output of the final internal leakage amount of the steam trap to be tested in the embodiment of the present invention.
具体实施方式Detailed ways
如图1所示，本实施例基于阀前管壁温度检测的蒸汽疏水阀内漏检测方法的步骤如下：As shown in Figure 1, the steps of the steam trap internal leakage detection method based on the pipe wall temperature detection in front of the valve in this embodiment are as follows:
1）分别根据式（1）计算出第一个代表点的正常管壁温度、第二个代表点的正常管壁温度，第一个代表点位于待检测蒸汽疏水阀前端的疏水管道上靠近待检测蒸汽疏水阀的位置，第二个代表点位于待检测蒸汽疏水阀前端的疏水管道上，且第二个代表点在疏水管道上位于第一个代表点的前端且与第一个代表点间距指定距离；1) Calculate the normal pipe wall temperature of the first representative point and the normal pipe wall temperature of the second representative point respectively according to formula (1). To detect the position of the steam trap, the second representative point is located on the drain pipe at the front end of the steam trap to be tested, and the second representative point is located on the drain pipe at the front end of the first representative point and is at a distance from the first representative point specified distance;
tgb1=β0'+β1'1(P/Pcr)+β1'2(P/Pcr)2+β2'1(T/Tcr)+β2'2(T/Tcr)2tgb1 =β0 '+β1 '1 (P/Pcr )+β1 '2 (P/Pcr )2 +β2 '1 (T/Tcr )+β2 '2 (T/Tcr )2
+β3'1(L/Lmax)+β3'2(L/Lmax)2+β4'1(D/Dmax)+β4'2(D/Dmax)2（1）+β3 '1 (L/Lmax )+β3 '2 (L/Lmax )2 +β4 '1 (D/Dmax )+β4 '2 (D/Dmax )2 (1)
+β5'1(hgb/hgb-max)+β5'2(hgb/hgb-max)2+β6'1(hbw/hbw-max)+β6'2(hbw/hbw-max)2+β5 '1 (hgb /hgb-max )+β5 '2 (hgb /hgb-max )2 +β6 '1 (hbw /hbw-max )+β6 '2 (hbw /hbw-max )2
+β7'1(ta/ta-max)+β7'2(ta/ta-max)2+ε'+β7 '1 (ta /ta-max )+β7 '2 (ta /ta-max )2 +ε'
式（1）中，tgb1表示第一个代表点或者第二个代表点的正常管壁温度，β0'、β1'1、β1'2……β'71、β'72表示计算管壁温度的拟合系数，ε'表示计算管壁温度的随机误差，P表示待检测蒸汽疏水阀前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L表示第一个代表点前端或者第二个代表点前端疏水管道的长度，Lmax表示同类型蒸汽疏水系统中疏水管道的最大长度，D表示待检测蒸汽疏水阀前端疏水管道的内径，Dmax表示同类型蒸汽疏水系统中疏水管道最大管道内径，hgb表示待检测蒸汽疏水阀前端疏水管道的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道管壁最大厚度，hbw表示待检测蒸汽疏水阀前端疏水管道的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道的保温层最大厚度，ta表示待检测蒸汽疏水阀前端疏水管道的环境温度，ta-max表示同类型蒸汽疏水系统中蒸汽疏水阀前端疏水管道的环境最大温度。In formula (1), tgb1 represents the normal tube wall temperature of the first representative point or the second representative point, β0 ', β1 '1 , β1 '2 ... β'71 , β'72 represent the calculated The fitting coefficient of the pipe wall temperature, ε' represents the random error in calculating the pipe wall temperature, P represents the steam pressure conveyed in the pipe at the front end of the steam trap to be tested, Pcr represents the critical pressure of the steam, and T represents the steam trap to be tested The temperature of the steam transported in the pipeline at the front end, Tcr represents the critical temperature of the steam, L represents the length of the drain pipe at the front end of the first representative point or the front end of the second representative point, Lmax represents the maximum value of the drain pipe in the same type of steam drain system Length, D represents the internal diameter of the drain pipe at the front end of the steam trap to be tested, Dmax represents the maximum internal diameter of the drain pipe in the same type of steam trap system, hgb represents the wall thickness of the drain pipe at the front end of the steam trap to be tested, hgb-max Indicates the maximum thickness of the drain pipe wall in the same type of steam trap system, hbw represents the thickness of the thermal insulation layer of the drain pipe at the front end of the steam trap to be tested, hbw-max represents the maximum thickness of the thermal insulation layer of the drain pipe in the same type of steam trap system, ta represents the ambient temperature of the drain pipe at the front end of the steam trap to be tested, and ta-max represents the maximum ambient temperature of the drain pipe at the front end of the steam trap in the same type of steam trap system.
如图2所示，应用本实施例方法的蒸汽疏水系统中，蒸汽疏水系统的凝汽器通过疏水管道2与蒸汽管道1连通，疏水管道2上设有待检测蒸汽疏水阀3。标号位置5表示待检测蒸汽疏水阀3前端的疏水管道2上靠近待检测蒸汽疏水阀3的位置设有的第一个代表点，标号位置4表示待检测蒸汽疏水阀3前端的疏水管道2上设有的第二个代表点，标号位置4和标号位置5之间间距指定距离。As shown in Figure 2, in the steam trap system using the method of this embodiment, the condenser of the steam trap system communicates with the steam pipe 1 through the
2）分别检测第一个代表点、第二个代表点的管壁温度，根据第一个代表点的实测管壁温度、第一个代表点的正常管壁温度计算出第一个代表点的实测温度升高值，根据第二个代表点的实测管壁温度、第二个代表点的正常管壁温度计算出第二个代表点的实测温度升高值；根据第一个代表点的实测管壁温度、第二个代表点的实测管壁温度计算出第一个代表点、第二个代表点之间的实测温度差值。2) Detect the tube wall temperature of the first representative point and the second representative point respectively, and calculate the measured value of the first representative point according to the measured tube wall temperature of the first representative point and the normal tube wall temperature of the first representative point Temperature rise value, calculate the measured temperature rise value of the second representative point according to the measured pipe wall temperature of the second representative point and the normal pipe wall temperature of the second representative point; according to the measured pipe wall temperature of the first representative point temperature, the measured tube wall temperature of the second representative point to calculate the measured temperature difference between the first representative point and the second representative point.
3）分别指定微漏、一般内漏或者严重内漏的泄漏量阈值；分别根据式（2）计算出第一个代表点或第二个代表点分别在微漏泄漏量阈值的最大泄漏量下的第一温度临界值，根据式（3）计算出第一个代表点或第二个代表点分别在严重泄漏量阈值的最小泄漏量下的第二温度临界值；3) Designate the leakage thresholds of micro-leakage, general internal leakage or serious internal leakage respectively; calculate the first representative point or the second representative point under the maximum leakage value of the micro-leakage leakage threshold respectively according to formula (2) Calculate the first temperature critical value according to the formula (3) and calculate the second temperature critical value of the first representative point or the second representative point respectively under the minimum leakage of the serious leakage threshold;
tgb2-G100=β0''+β1''1(P/Pcr)+β1''2(P/Pcr)2+β2''1(T/Tcr)+β2''2(T/Tcr)2tgb2-G100 =β0 ''+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β2 ''1 (T/Tcr )+β2 ''2 (T/Tcr )2
+β3''1(L/Lmax)+β3''2(L/Lmax)2+β4''1(D/Dmax)+β4''2(D/Dmax)2（2）+β3 ''1 (L/Lmax )+β3 ''2 (L/Lmax )2 +β4 ''1 (D/Dmax )+β4 ''2 (D/Dmax )2 (2)
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β6''1(hbw/hbw-max)+β6''2(hbw/hbw-max)2+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β6 ''1 (hbw /hbw-max )+β6 ''2 (hbw /hbw-max )2
+β7''1G1+β7''2G12+β7''3G13+ε''+β7 ''1 G1 +β7 ''2 G12 +β7 ''3 G13 +ε''
tgb3-G500=β0'''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β'2''1(T/Tcr)+β'2''2(T/Tcr)2tgb3-G500 =β0 '''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β'2 ''1 (T/Tcr ) +β'2 ''2 (T/Tcr )2
+β3'''1(L/Lmax)+β3'''2(L/Lmax)2+β4'''1(D/Dmax)+β4'''2(D/Dmax)2（3）+β3 '''1 (L/Lmax )+β3 '''2 (L/Lmax )2 +β4 '''1 (D/Dmax )+β4 '''2 (D/ Dmax )2 (3)
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β6'''1(hbw/hbw-max)+β6'''2(hbw/hbw-max)2+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β6 '''1 (hbw /hbw-max )+ β6 '''2 (hbw /hbw-max )2
+β7'''1G2+β'7''2G22+β'7''3G23+ε'''+β7 '''1 G2 +β'7 ''2 G22 +β'7 ''3 G23 +ε'''
式（2）和式（3）中，tgb2-G100表示第一个代表点或第二个代表点分别在微漏泄漏量阈值的最大泄漏量下的第一温度临界值；tgb3-G500表示第一个代表点或第二个代表点分别在严重泄漏量阈值的最小泄漏量下的第二温度临界值；β0''、β1''1、β1''2、……β'7'1、β'7'2、β'7'3分别表示计算管壁温度的拟合系数、ε''表示计算管壁温度的随机误差，β0'''、β1'''1、β1'''2、……β'7''1、β'7''2、β'7'3分别表示计算管壁温度的拟合系数，ε'''表示计算管壁温度的随机误差，P表示待检测蒸汽疏水阀3前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀3前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L表示第一个代表点前端或者第二个代表点前端疏水管道2的长度，Lmax表示同类型蒸汽疏水系统中疏水管道2的最大长度，D表示待检测蒸汽疏水阀3前端疏水管道2的内径，Dmax表示同类型蒸汽疏水系统中疏水管道2最大管道内径，hgb表示待检测蒸汽疏水阀3前端疏水管道2的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道2管壁最大厚度，hbw表示待检测蒸汽疏水阀3前端疏水管道2的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道2的保温层最大厚度，G1代表微漏泄漏量阈值的最大泄漏量，G2代表严重泄漏量阈值的最小泄漏量。In formula (2) and formula (3), tgb2-G100 represents the first temperature critical value of the first representative point or the second representative point respectively at the maximum leakage of micro-leakage threshold; tgb3-G500 Indicates the second temperature critical value of the first representative point or the second representative point respectively under the minimum leakage of the serious leakage threshold; β0 '', β1 ''1 , β1 ''2 , ... β '7 '1 , β'7 '2 , β'7 '3 denote the fitting coefficients of the calculated tube wall temperature, ε'' denotes the random error of the calculated tube wall temperature, β0 ''', β1 '''1 , β1 '''2 , ... β'7 ''1 , β'7 ''2 , β'7 '3 respectively represent the fitting coefficients for calculating the tube wall temperature, ε''' denotes the calculated tube wall temperature P represents the steam pressure conveyed in the pipeline at the front end of the steam trap 3 to be detected, Pcr represents the critical pressure of the steam, T represents the temperature of the steam conveyed in the pipe at the front end of the steam trap 3 to be detected, and Tcr represents the steam L represents the length of the drain pipe 2 at the front end of the first representative point or the front end of the second representative point, Lmax represents the maximum length of the drain pipe 2 in the same type of steam trap system, and D represents the front end of the steam trap 3 to be tested The inner diameter of the drain pipe 2, Dmax represents the maximum inner diameter of the drain pipe 2 in the same type of steam trap system, hgb represents the wall thickness of the drain pipe 2 at the front end of the steam trap 3 to be tested, hgb-max represents the same type of steam drain system The maximum thickness of the pipe wall of the medium drain pipe 2, hbw represents the thickness of the thermal insulation layer of the drain pipe 2 at the front end of the steam trap 3 to be tested, hbw-max represents the maximum thickness of the thermal insulation layer of the drain pipe 2 in the same type of steam drain system, G1 represents The maximum leakage amount of the microleakage threshold, andG2 represents the minimum leakage amount of the serious leakage threshold.
本实施例中指定微漏、一般内漏或者严重内漏的泄漏量阈值具体如表1所示。In this embodiment, the leakage volume thresholds for specifying micro-leakage, general endoleak or serious endoleak are specifically shown in Table 1.
表1：三种泄漏状态的泄漏量阈值表。Table 1: Leakage threshold table for three leakage states.
参见表1，当待检测蒸汽疏水阀3的阀门通径不大于DN50mm时，如果泄漏量小于或者等于100kg/h，则将泄漏状态判定为微漏，如果泄漏量在100～500kg/h之间，则将泄漏状态判定为一般泄漏，如果泄漏量大于500kg/h，则将泄漏状态判定为严重泄漏，此时tgb2-G100表示第一个代表点或第二个代表点分别在100kg/h泄漏量下的第一温度临界值；tgb3-G500表示第一个代表点或第二个代表点分别在500kg/h泄漏量下的第二温度临界值；当待检测蒸汽疏水阀3的阀门通径大于DN50mm时，如果泄漏量小于或者等于500kg/h，则将泄漏状态判定为微漏，如果泄漏量在500～1500kg/h之间，则将泄漏状态判定为一般泄漏，如果泄漏量大于1500kg kg/h，则将泄漏状态判定为严重泄漏，此时tgb2-G100表示第一个代表点或第二个代表点分别在500kg/h泄漏量下的第一温度临界值；tgb3-G500表示第一个代表点或第二个代表点分别在1500kg/h泄漏量下的第二温度临界值。See Table 1, when the valve diameter of the steam trap 3 to be tested is not greater than DN50mm, if the leakage is less than or equal to 100kg/h, the leakage state is judged as a microleakage, and if the leakage is between 100 and 500kg/h , the leakage state is judged as general leakage. If the leakage is greater than 500kg/h, the leakage state is judged as serious leakage. At this time, tgb2-G100 means that the first representative point or the second representative point are respectively at 100kg/h The first temperature critical value under the leakage rate; tgb3-G500 represents the second temperature critical value of the first representative point or the second representative point under the leakage rate of 500kg/h respectively; when the valve of the steam trap 3 to be tested When the diameter is greater than DN50mm, if the leakage is less than or equal to 500kg/h, the leakage state will be judged as microleakage; 1500kg kg/h, the leakage state is judged as serious leakage, at this time tgb2-G100 represents the first temperature critical value of the first representative point or the second representative point under the leakage rate of 500kg/h respectively; tgb3- G500 represents the second temperature critical value of the first representative point or the second representative point at the leakage rate of 1500kg/h respectively.
4）如图3所示，选择第一个代表点的实测管壁温度或者第二个代表点的实测管壁温度作为泄漏状态判定管壁温度，在泄漏状态判定管壁温度大于所选择代表点的正常管壁温度的前提下，将泄漏状态判定管壁温度减去所选择代表点的正常管壁温度得到的温度差值，然后根据温度差值判断蒸汽疏水阀3的泄漏状态，如图3所示，如果满足式（4）则判定泄漏状态处于微漏状态，如果满足式（5）则判定泄漏状态处于一般内漏状态，如果满足式（6）则判定泄漏状态处于严重内漏状态；如果不满足式（4）、式（5）、式（6）中的任意一个，则判定待检测蒸汽疏水阀3未发生泄漏并结束检测或者返回执行步骤2）；如果判定待检测蒸汽疏水阀3未发生泄漏并结束检测时，本实施例为实现单次内漏检测状态，如果返回执行步骤2），则本实施例为实现内漏在线检测状态。4) As shown in Figure 3, select the actual measured pipe wall temperature of the first representative point or the actual measured pipe wall temperature of the second representative point as the leakage state to determine the pipe wall temperature, and determine the pipe wall temperature in the leakage state to be greater than the selected representative point Under the premise of the normal pipe wall temperature, determine the leakage state by subtracting the temperature difference obtained by subtracting the normal pipe wall temperature of the selected representative point from the leakage state, and then judge the leakage state of the steam trap 3 according to the temperature difference, as shown in Figure 3 As shown, if formula (4) is satisfied, it is judged that the leakage state is in a micro-leakage state; if formula (5) is satisfied, it is judged that the leakage state is in a general internal leakage state; if formula (6) is satisfied, it is judged that the leakage state is in a serious internal leakage state; If any one of formula (4), formula (5) and formula (6) is not satisfied, it is judged that the steam trap 3 to be tested has no leakage and ends the test or returns to step 2); if it is judged that the steam trap to be tested 3 When no leakage occurs and the detection ends, this embodiment is in the state of realizing a single internal leakage detection, and if it returns to step 2), this embodiment is in the state of realizing the online detection of internal leakage.
△ts≤tgb2-G100-tgb1 （4）△ts ≤tgb2-G100 -tgb1 (4)
tgb2-G100-tgb1<△ts≤tgb3-G500-tgb1 （5）tgb2-G100 -tgb1 <△ts ≤tgb3-G500 -tgb1 (5)
△ts>tgb3-G500-tgb1 （6）△ts >tgb3-G500 -tgb1 (6)
式（4）、式（5）和式（6）中，△ts表示泄漏状态判定管壁温度减去第一个代表点或者第二个代表点的正常管壁温度得到的温度差值，tgb2-G100表示第一温度临界值；tgb3-G500表示第二温度临界值，tgb1表示第一个代表点或者第二个代表点的正常管壁温度；分别将第一个代表点或者第二个代表点作为当前代表点，跳转执行下一步开始执行步骤5）。In formula (4), formula (5) and formula (6), △ ts represents the temperature difference obtained by subtracting the normal pipe wall temperature of the first representative point or the second representative point from the leakage state determination pipe wall temperature, tgb2-G100 represents the first temperature critical value; tgb3-G500 represents the second temperature critical value, tgb1 represents the normal pipe wall temperature of the first representative point or the second representative point; The second representative point is used as the current representative point, jump to the next step and start to execute step 5).
如图4所示，本实施例采用假设迭代法分别计算两个代表点（第一个代表点和第二个代表点）对应的泄漏量，其详细步骤参见下述步骤5）和步骤6）。As shown in Figure 4, this embodiment adopts the hypothetical iteration method to calculate the leakage corresponding to two representative points (the first representative point and the second representative point), and the detailed steps refer to the following step 5) and step 6) .
5）根据判定得到的当前泄漏状态设置一个假定泄漏量，如果当前泄漏状态为微漏，则根据式（7）计算得到当前代表点在假定泄漏量下对应的温度理论升高值，如果当前泄漏状态为一般内漏，则根据式（8）计算得到当前代表点在假定泄漏量下对应的温度理论升高值，如果当前泄漏状态为严重内漏，则根据式（9）计算得到当前代表点在假定泄漏量下对应的温度理论升高值；5) Set a hypothetical leakage amount according to the current leakage state determined. If the current leakage state is a microleakage, then calculate the theoretical temperature rise value corresponding to the current representative point under the assumed leakage amount according to formula (7). If the current leakage If the state is general internal leakage, then calculate the theoretical temperature rise value corresponding to the current representative point under the assumption of leakage according to formula (8); if the current leakage state is serious internal leakage, then calculate the current representative point according to formula (9) The corresponding theoretical temperature rise value under the assumption of leakage;
△t1=(β'0'+β1''1(P/Pcr)+β1''2(P/Pcr)2+β'2'1(T/Tcr)+β'2'2(T/Tcr)2△t1 =(β'0 '+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β'2 '1 (T/Tcr )+β'2 '2 (T/Tcr )2
+β3''1(L/Lmax)+β3''2(L/Lmax)2+β'4'1(D/Dmax)+β'4'2(D/Dmax)2+β3 ''1 (L/Lmax )+β3 ''2 (L/Lmax )2 +β'4 '1 (D/Dmax )+β'4 '2 (D/Dmax )2
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β'6'1(hbw/hbw-max)+β'6'2(hbw/hbw-max)2 （7）+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β'6 '1 (hbw /hbw-max )+β'6 '2 (hbw /hbw-max )2 (7)
+β'7'1G+β'7'2G2+β'7'3G3+ε'')-tgb1+β'7 '1 G+β'7 '2 G2 +β'7 '3 G3 +ε'')-tgb1
△t2=(β'0''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β'2''1(T/Tcr)+β'2''2(T/Tcr)2△t2 =(β'0 ''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β'2 ''1 (T/Tcr ) +β'2 ''2 (T/Tcr )2
+β3'''1(L/Lmax)+β3'''2(L/Lmax)2+β'4''1(D/Dmax)+β'4''2(D/Dmax)2+β3 '''1 (L/Lmax )+β3 '''2 (L/Lmax )2 +β'4 ''1 (D/Dmax )+β'4 ''2 (D/ Dmax )2
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β'6''1(hbw/hbw-max)+β'6''2(hbw/hbw-max)2 （8）+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β'6 ''1 (hbw /hbw-max )+ β'6 ''2 (hbw /hbw-max )2 (8)
+β'7''1G+β'7''2G2+β'7''3G3+ε''')-tgb1+β'7 ''1 G+β'7 ''2 G2 +β'7 ''3 G3 +ε''')-tgb1
△t3=(β'0'''+β1'''1'(P/Pcr)+β1''''2(P/Pcr)2+β'2'''1(T/Tcr)+β'2'''2(T/Tcr)2△t3 =(β'0 '''+β1 '''1 '(P/Pcr )+β1 ''''2 (P/Pcr )2 +β'2 '''1 (T /Tcr )+β'2 '''2 (T/Tcr )2
+β3''''1(L/Lmax)+β3''''2(L/Lmax)2+β'4'''1(D/Dmax)+β'4'''2(D/Dmax)2 （9）+β3 ''''1 (L/Lmax )+β3 ''''2 (L/Lmax )2 +β'4 '''1 (D/Dmax )+β'4 '''2 (D/Dmax )2 (9)
+β5''''1(hbw/hbw-max)+β5''''2(hbw/hbw-max)2+β'6'''1G+β'6'''2G2+ε'''')-tgb1+β5 ''''1 (hbw /hbw-max )+β5 ''''2 (hbw /hbw-max )2 +β'6 '''1 G+β'6 '''2 G2 +ε'''')-tgb1
式（7）、式（8）和式（9）中，△t1表示微漏情况下假定泄漏量对应的当前代表点的温度理论升高值，△t2表示一般内漏情况下假定泄漏量对应的当前代表点的温度理论升高值，△t3表示严重内漏情况下假定泄漏量对应的当前代表点的温度理论升高值，β0''、β1''1、β1''2、……β'7'1、β'7'2、β'7'3分别表示计算管壁温度的拟合系数，ε''表示计算管壁温度的随机误差；β0'''、β1'''1、β1'''2、……β'7''1、β'7''2、β7''3'分别表示计算管壁温度的拟合系数，ε'''表示计算管壁温度的随机误差；β0''''、β1''1''、β1''2''……β6'''1'、β6'''2'分别表示计算管壁温度的拟合系数，ε''''表示计算管壁温度的随机误差；P表示待检测蒸汽疏水阀3前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀3前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L表示第一个代表点前端或者第二个代表点前端疏水管道2的长度，Lmax表示同类型蒸汽疏水系统中疏水管道2的最大长度，D表示待检测蒸汽疏水阀3前端疏水管道2的内径，Dmax表示同类型蒸汽疏水系统中疏水管道2最大管道内径，hgb表示待检测蒸汽疏水阀3前端疏水管道2的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道2管壁最大厚度，hbw表示待检测蒸汽疏水阀3前端疏水管道2的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道2的保温层最大厚度，G表示假定泄漏量；tgb1表示当前代表点的正常管壁温度。In formula (7), formula (8) and formula (9), △t1 represents the theoretical temperature rise value of the current representative point corresponding to the assumed leakage amount in the case of micro-leakage, and △t2 represents the assumed leakage value in the case of general internal leakage △t3 represents the theoretical temperature rise value of the current representative point corresponding to the assumed leakage in the case of severe internal leakage, β0 '', β1 ''1 , β1 ''2 , ... β'7 '1 , β'7 '2 , β'7 '3 represent the fitting coefficients for calculating the tube wall temperature respectively, ε'' denotes the random error for calculating the tube wall temperature; β0 ''', β1 '''1 , β1 '''2 , ... β'7 ''1 , β'7 ''2 , β7 ''3 'represent the fitting coefficients for calculating the tube wall temperature, ε' '' indicatesthe randomerrorof calculatingthetubewalltemperature; 'represents the fitting coefficient of the calculated pipe wall temperature, ε''''represents the random error of the calculated pipe wall temperature; P represents the steam pressure transported in the pipeline at the front end of the steam trap 3 to be tested, and Pcr represents the critical pressure of the steam , T represents the temperature of the steam transported in the pipeline at the front end of the steam trap 3 to be tested, Tcr represents the critical temperature of the steam, L represents the length of the drain pipe 2 at the front end of the first representative point or the front end of the second representative point, and Lmax represents The maximum length of the drain pipe 2 in the same type of steam trap system, D represents the inner diameter of the drain pipe 2 at the front end of the steam trap 3 to be tested, Dmax represents the maximum inner diameter of the drain pipe 2 in the same type of steam drain system, hgb represents the steam to be detected The pipe wall thickness of the drain pipe 2 at the front end of the steam trap 3, hgb-max represents the maximum thickness of the pipe wall of the drain pipe 2 in the same type of steam trap system, hbw represents the thickness of the insulation layer of the drain pipe 2 at the front end of the steam trap 3, hbw-max represents the maximum thickness of the thermal insulation layer of the drain pipe 2 in the same type of steam drain system, G represents the assumed leakage; tgb1 represents the normal pipe wall temperature at the current representative point.
6）判断当前代表点在假定泄漏量下对应的温度理论升高值是否满足条件式（10），如果不能满足条件式（10）则返回重新迭代执行步骤5）；如果满足条件式（10）则将假定泄漏量作为当前代表点对应的泄漏量，当得到第一个代表点或者第二个代表点对应的泄漏量后跳转执行步骤7）；6) Judging whether the theoretical temperature increase value corresponding to the current representative point under the assumed leakage rate satisfies the conditional formula (10), if the conditional formula (10) cannot be satisfied, return to step 5) for re-iteration; if the conditional formula (10) is satisfied Then assume the leakage amount as the leakage amount corresponding to the current representative point, and jump to step 7 after getting the leakage amount corresponding to the first representative point or the second representative point);
|△tjd-△ts|/△ts≤0.1% （10）|△tjd -△ts |/△ts ≤0.1% (10 )
式（10）中，△tjd表示当前代表点在假定泄漏量下对应的温度理论升高值，△ts表示当前代表点的实测温度升高值。In formula (10), △tjd represents the theoretical temperature rise value corresponding to the current representative point under the assumption of leakage, and △ts represents the measured temperature rise value of the current representative point.
如图5所示，本实施例采用假设迭代法计算第一个代表点、第二个代表点之间温度差值对应的泄漏量，其详细步骤参见下述步骤7）和步骤8）。As shown in FIG. 5 , this embodiment adopts a hypothetical iterative method to calculate the leakage corresponding to the temperature difference between the first representative point and the second representative point. For detailed steps, refer to the following steps 7) and 8).
7）根据判定得到的当前泄漏状态设置一个假定泄漏量，如果当前泄漏状态为微漏，则根据式（11）计算得到第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值；如果当前泄漏状态为一般内漏，则根据式（12）计算得到第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，如果当前泄漏状态为严重内漏，则根据式（13）计算得到第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值；7) Set a hypothetical leakage amount according to the current leakage state obtained from the judgment. If the current leakage state is microleakage, calculate according to formula (11) to obtain the assumed leakage amount between the first representative point and the second representative point. Theoretical temperature difference; if the current leakage state is general internal leakage, then calculate the theoretical temperature difference between the first representative point and the second representative point under the assumed leakage amount according to formula (12), if the current leakage state If it is serious internal leakage, calculate the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage according to formula (13);
δt1=[β0''+β1''1(P/Pcr)+β1''2(P/Pcr)2+β2''1(T/Tcr)+β2''2(T/Tcr)2δt1 =[β0 ''+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β2 ''1 (T/Tcr )+β2 ''2 (T/Tcr )2
+β3''1(L1/Lmax)+β3''2(L1/Lmax)2+β'4'1(D/Dmax)+β'4'2(D/Dmax)2+β3 ''1 (L1 /Lmax )+β3 ''2 (L1 /Lmax )2 +β'4 '1 (D/Dmax )+β'4 '2 (D/Dmax )2
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β6''1(hbw/hbw-max)+β6''2(hbw/hbw-max)2+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β6 ''1 (hbw /hbw-max )+β6 ''2 (hbw /hbw-max )2
+β7''1G+β7''2G2+β7''3G3+ε''] （11）+β7 ''1 G+β7 ''2 G2 +β7 ''3 G3 +ε''] (11)
-[β0''+β1''1(P/Pcr)+β1''2(P/Pcr)2+β2''1(T/Tcr)+β2''2(T/Tcr)2-[β0 ''+β1 ''1 (P/Pcr )+β1 ''2 (P/Pcr )2 +β2 ''1 (T/Tcr )+β2 ''2 ( T/Tcr )2
+β3''1(L2/Lmax)+β3''2(L2/Lmax)2+β4''1(D/Dmax)+β4''2(D/Dmax)2+β3 ''1 (L2 /Lmax )+β3 ''2 (L2 /Lmax )2 +β4 ''1 (D/Dmax )+β4 ''2 (D/Dmax )2
+β5''1(hgb/hgb-max)+β5''2(hgb/hgb-max)2+β6''1(hbw/hbw-max)+β6''2(hbw/hbw-max)2+β5 ''1 (hgb /hgb-max )+β5 ''2 (hgb /hgb-max )2 +β6 ''1 (hbw /hbw-max )+β6 ''2 (hbw /hbw-max )2
+β7''1G+β7''2G2+β7''3G3+ε'']+β7 ''1 G+β7 ''2 G2 +β7 ''3 G3 +ε'']
δt2=[β0'''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β2'''1(T/Tcr)+β2'''2(T/Tcr)2δt2 =[β0 '''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β2 '''1 (T/Tcr )+ β2 '''2 (T/Tcr )2
+β3'''1(L1/Lmax)+β3'''2(L1/Lmax)2+β4'''1(D/Dmax)+β4'''2(D/Dmax)2+β3 '''1 (L1 /Lmax )+β3 '''2 (L1 /Lmax )2 +β4 '''1 (D/Dmax )+β4 '''2 ( D/Dmax )2
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β6'''1(hbw/hbw-max)+β6'''2(hbw/hbw-max)2+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β6 '''1 (hbw /hbw-max )+ β6 '''2 (hbw /hbw-max )2
+β7'''1G+β'7''2G2+β'7''3G3+ε'''] （12）+β7 '''1 G+β'7 ''2 G2 +β'7 ''3 G3 +ε'''] (12)
-[β0'''+β1'''1(P/Pcr)+β1'''2(P/Pcr)2+β2'''1(T/Tcr)+β2'''2(T/Tcr)2-[β0 '''+β1 '''1 (P/Pcr )+β1 '''2 (P/Pcr )2 +β2 '''1 (T/Tcr )+β2 '''2 (T/Tcr )2
+β3'''1(L2/Lmax)+β3'''2(L2/Lmax)2+β'4''1(D/Dmax)+β4'''2(D/Dmax)2+β3 '''1 (L2 /Lmax )+β3 '''2 (L2 /Lmax )2 +β'4 ''1 (D/Dmax )+β4 '''2 ( D/Dmax )2
+β5'''1(hgb/hgb-max)+β5'''2(hgb/hgb-max)2+β6'''1(hbw/hbw-max)+β6'''2(hbw/hbw-max)2+β5 '''1 (hgb /hgb-max )+β5 '''2 (hgb /hgb-max )2 +β6 '''1 (hbw /hbw-max )+ β6 '''2 (hbw /hbw-max )2
+β7'''1G+β'7''2G2+β'7''3G3+ε''']+β7 '''1 G+β'7 ''2 G2 +β'7 ''3 G3 +ε''']
δt3=[β0''''+β1'''1'(P/Pcr)+β1'''2'(P/Pcr)2+β2''''1(T/Tcr)+β2''''2(T/Tcr)2δt3 =[β0 ''''+β1 '''1 '(P/Pcr )+β1 '''2 '(P/Pcr )2 +β2 ''''1 (T/ Tcr )+β2 ''''2 (T/Tcr )2
+β3''''1(L1/Lmax)+β3''''2(L1/Lmax)2+β'4'''1(D/Dmax)+β'4'''2(D/Dmax)2+β3 ''''1 (L1 /Lmax )+β3 ''''2 (L1 /Lmax )2 +β'4 '''1 (D/Dmax )+β'4 '''2 (D/Dmax )2
+β5''''1(hbw/hbw-max)+β5''''2(hbw/hbw-max)2+β6''''1G+β6''''2G2+ε'''']（13）+β5 ''''1 (hbw /hbw-max )+β5 ''''2 (hbw /hbw-max )2 +β6 ''''1 G+β6 ''''2 G2 +ε''''] (13)
-[β0''''+β1'''1'(P/Pcr)+β1'''2'(P/Pcr)2+β2''''1(T/Tcr)+β2''''2(T/Tcr)2-[β0 ''''+β1 '''1 '(P/Pcr )+β1 '''2 '(P/Pcr )2 +β2 ''''1 (T/Tcr )+β2 ''''2 (T/Tcr )2
+β3''''1(L2/Lmax)+β3''''2(L2/Lmax)2+β4''''1(D/Dmax)+β4''''2(D/Dmax)2+β3 ''''1 (L2 /Lmax )+β3 ''''2 (L2 /Lmax )2 +β4 ''''1 (D/Dmax )+β4 ''''2 (D/Dmax )2
+β5''''1(hbw/hbw-max)+β5''''2(hbw/hbw-max)2+β6''''1G+β6''''2G2+ε'''']+β5 ''''1 (hbw /hbw-max )+β5 ''''2 (hbw /hbw-max )2 +β6 ''''1 G+β6 ''''2 G2 +ε'''']
式（11）、式（12）和式（13）中，δt1表示微漏情况下第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，δt2表示一般泄漏情况下第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，δt3表示严重泄漏情况下第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，β0''、β1''1、β1''2、……β'7'1、β'7'2、β'7'3分别表示计算管壁温度的拟合系数，ε''表示计算管壁温度的随机误差；β0'''、β1'''1、β1'''2、……β'7''1、β'7''2、β7''3'分别表示计算管壁温度的拟合系数，ε'''表示计算管壁温度的随机误差；β0''''、β1''1''、β1''2''……β6'''1'、β6'''2'分别表示计算管壁温度的拟合系数，ε''''表示计算管壁温度的随机误差；P表示待检测蒸汽疏水阀3前端的管道内输送的蒸汽压力，Pcr表示蒸汽的临界压力，T表示待检测蒸汽疏水阀3前端的管道内输送的蒸汽温度，Tcr表示蒸汽的临界温度，L1表示第一个代表点前段疏水管道2的长度，L2表示第二个代表点前段疏水管道2的长度，Lmax表示同类型蒸汽疏水系统中疏水管道2的最大长度，D表示待检测蒸汽疏水阀3前端疏水管道2的内径，Dmax表示同类型蒸汽疏水系统中疏水管道2最大管道内径，hgb表示待检测蒸汽疏水阀3前端疏水管道2的管壁厚度，hgb-max表示同类型蒸汽疏水系统中疏水管道2管壁最大厚度，hbw表示待检测蒸汽疏水阀3前端疏水管道2的保温层厚度，hbw-max表示同类型蒸汽疏水系统中疏水管道2的保温层最大厚度，G表示假定泄漏量。In Equation (11), Equation (12) and Equation (13), δt1 represents the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage in the case of microleakage, and δt2 represents In the case of general leakage, the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage, δt3 represents the temperature difference between the first representative point and the second representative point in the case of serious leakage Theoretical temperature difference under leakage, β0 '', β1 ''1 , β1 ''2 , ... β'7 '1 , β'7 '2 , β'7 '3 respectively represent the calculated pipe wall The fitting coefficient of temperature, ε'' represents the random error in calculating the tube wall temperature; β0 ''', β1 '''1 , β1 '''2 ,... β'7 ''1 , β'7 ''2 , β7 ''3 'represent the fitting coefficients of the calculated tube wall temperature, ε'''represents the random error of the calculated tube wall temperature; β0 '''', β1 ''1 '', β1 ''2 ''... β6 '''1 ', β6 '''2 ' represent the fitting coefficients for calculating the tube wall temperature respectively, ε'''' represent the random error in calculating the tube wall temperature; P represents The pressure of the steam transported in the pipeline at the front end of the steam trap 3 to be tested, Pcr indicates the critical pressure of the steam, T indicates the temperature of the steam transported in the pipeline at the front end of the steam trap 3 to be tested, Tcr indicates the critical temperature of the steam, L1 Indicates the length of the drainage pipeline 2 in the front section of the first representative point, L2 indicates the length of the drainage pipeline 2 in the front section of the second representative point, Lmax indicates the maximum length of the drainage pipeline 2 in the same type of steam drainage system, and D indicates the steam drainage to be tested The inner diameter of the drain pipe 2 at the front end of the valve 3, Dmax indicates the maximum inner diameter of the drain pipe 2 in the steam trap system of the same type, hgb indicates the wall thickness of the drain pipe 2 at the front end of the steam trap 3 to be tested, and hgb-max indicates the same type The maximum thickness of the pipe wall of the drain pipe 2 in the steam drain system, hbw represents the thickness of the thermal insulation layer of the drain pipe 2 at the front end of the steam trap 3 to be tested, hbw-max represents the maximum thickness of the thermal insulation layer of the drain pipe 2 in the same type of steam drain system, G represents the assumed leakage amount.
8）判定第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值与第一个代表点、第二个代表点之间的实测温度差值是否满足式（14），如果满足式（14）则将当前的假定泄漏量作为第一个代表点、第二个代表点之间温度差值对应的泄漏量，跳转执行步骤9），否则跳转执行步骤7）重新假定泄漏量以确定第一个代表点、第二个代表点之间温度差值对应的泄漏量；8) Determine whether the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage and the measured temperature difference between the first representative point and the second representative point satisfy the formula (14 ), if formula (14) is satisfied, the current assumed leakage is taken as the leakage corresponding to the temperature difference between the first representative point and the second representative point, and skip to step 9), otherwise, skip to step 7 ) Re-assume the leakage to determine the leakage corresponding to the temperature difference between the first representative point and the second representative point;
|δjd-δs|/δs≤0.1% （14）|δjd -δs |/δs ≤0.1% (14)
式（14）中，δjd表示第一个代表点、第二个代表点之间在假定泄漏量下的理论温度差值，δs表示第一个代表点、第二个代表点之间的实测温度差值。In formula (14), δjd represents the theoretical temperature difference between the first representative point and the second representative point under the assumption of leakage, and δs represents the temperature difference between the first representative point and the second representative point The measured temperature difference.
9）根据第一个代表点对应的泄漏量、第二个代表点对应的泄漏量以及第一个代表点、第二个代表点之间温度差值对应的泄漏量三者中选择一个作为待检测蒸汽疏水阀3的最终内漏泄漏量输出。9) According to the leakage amount corresponding to the first representative point, the leakage amount corresponding to the second representative point, and the leakage amount corresponding to the temperature difference between the first representative point and the second representative point, select one as the target Detect the final internal leakage output of the steam trap 3.
如图6所示，本实施例中步骤9）实施步骤如下：判断第一个代表点对应的泄漏量、第二个代表点对应的泄漏量以及第一个代表点、第二个代表点之间温度差值对应的泄漏量三者是否满足式（15），如果满足式（15），则从第一个代表点对应的泄漏量、第二个代表点对应的泄漏量以及第一个代表点、第二个代表点之间温度差值对应的泄漏量中任意选择一个作为待检测蒸汽疏水阀3的最终内漏泄漏量输出；否则将第一个代表点对应的泄漏量作为待检测蒸汽疏水阀3的最终内漏泄漏量输出；As shown in Figure 6, the implementation steps of step 9) in this embodiment are as follows: determine the leakage amount corresponding to the first representative point, the leakage amount corresponding to the second representative point, and the difference between the first representative point and the second representative point. Whether the leakage corresponding to the temperature difference between the three satisfies the formula (15), if it satisfies the formula (15), then from the leakage corresponding to the first representative point, the leakage corresponding to the second representative point and the first representative point, the leakage corresponding to the temperature difference between the second representative point, select any one as the final internal leakage leakage output of the steam trap 3 to be tested; otherwise, the leakage corresponding to the first representative point is used as the steam to be detected Output of final internal leakage of steam trap 3;
|G11-G12|/G11≤1%且|G11-G13|/G11≤1% （15）|G11 -G12 |/G11 ≤1% and |G11 -G13 |/G11 ≤1% (15)
式（15）中，G11表示第一个代表点对应的泄漏量，G12表示第二个代表点对应的泄漏量，G13表示第一个代表点、第二个代表点之间温度差值对应的泄漏量。In formula (15), G11 represents the leakage amount corresponding to the first representative point, G12 represents the leakage amount corresponding to the second representative point, and G13 represents the temperature difference between the first representative point and the second representative point The value corresponds to the amount of leakage.
以上所述仅是本发明的优选实施方式，本发明的保护范围并不仅局限于上述实施例，凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理前提下的若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above descriptions are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.
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