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CN117797950A - Inlet smoke box composite flow field pre-dedusting system and dedusting method of electric dust collector - Google Patents

Inlet smoke box composite flow field pre-dedusting system and dedusting method of electric dust collector
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Publication number
CN117797950A
CN117797950ACN202311081273.9ACN202311081273ACN117797950ACN 117797950 ACN117797950 ACN 117797950ACN 202311081273 ACN202311081273 ACN 202311081273ACN 117797950 ACN117797950 ACN 117797950A
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China
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dust
laminar flow
flow plate
plate
flue gas
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Inventor
解标
马修远
张涛
孙志国
单永华
邴玉良
岳显
邱建民
任厚银
韦飞
杨震
黄细聪
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Anhui Deyuan Environment Technology Co ltd
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Anhui Deyuan Environment Technology Co ltd
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Priority to CN202311081273.9ApriorityCriticalpatent/CN117797950A/en
Publication of CN117797950ApublicationCriticalpatent/CN117797950A/en
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Abstract

The invention belongs to the technical field of electrostatic dust collector equipment matched with industrial kiln dust purification, and discloses an inlet smoke box composite flow field pre-dedusting system and a dedusting method of an electrostatic dust collector, wherein a small laminar flow plate or a large laminar flow plate is used for secondarily distributing high-speed airflow from a flue to form a flat flow field, labyrinth porous media in a multi-character shape are arranged in a turbulent flow plate, the parallel or vertical passing airflow is formatted to form a turbulent flow field, dust-containing airflow suddenly changes due to wind speed and wind direction when passing through, and the dust is stripped and attached to an obstacle due to centrifugal force formed under the action of the suddenly changed wind speed and wind direction due to different inertia of gas and particles, so that the separation of the air and the dust is realized; the turbulence plate is connected with a vibration system which is connected with a vibration control system. The inlet flow field of the electric dust collector is more uniform, so that the inlet smoke box has higher capability of removing dust of large particle dust and condensing dust of small particle dust, the dust concentration of an electric field is reduced, and the electric field is promoted to improve the collection capability of fine dust.

Description

Inlet smoke box composite flow field pre-dedusting system and dedusting method of electric dust collector
Technical Field
The invention belongs to the technical field of electrostatic precipitator equipment matched with industrial kiln smoke purification, and particularly relates to a pre-dedusting inlet smoke box of a composite flow field of an electrostatic precipitator and a design method.
Background
Known electrostatic precipitator import smoke box includes: the dust collecting device comprises a quadrangular frustum pyramid type shell, two to three layers of hole type air flow distribution plates, a pipe support and the like, wherein the air flow distribution plates have the function of homogenizing a flow field, but do not have dust collecting capacity or limited dust collecting capacity, so that the air flow distribution plates are generally not provided with a vibration dust removing mechanism, and special conditions such as excessive inlet dust concentration, excessive ammonia escape of a denitration system, leakage of an economizer and the like cause the blocking of ash adhesion of the air flow distribution plate holes, an air flow distribution plate vibration device is needed to be arranged, and the air flow distribution plates are rarely provided with vibration devices.
The known electric dust collector has a multiple-peculiar-efficiency formula, one of the assumed conditions for establishment of the theory is that the airflow field of the airflow flowing through the electric dust collector is uniform, and the partial dust collection capacity of the electric dust collector is lower due to the non-uniform airflow, so that the average efficiency of the electric dust collector is reduced, the uniformity of the airflow field is one of the conditions for establishment of the multiple-peculiar-efficiency formula, and the electric dust collector is one of the technical difficulties of the electric dust collector.
The inlet smoke box of the electric dust collector is used as a transition section for enabling the flue with more than ten square sections to be transited to an electric field with hundreds of square sections, so that the flue gas flow rate of more than ten meters per second is reduced to the electric field wind speed of about one meter per second in a few seconds through a path of about five meters long, and for the asymmetric air inlet flue, the air speed and the air flow uniformity of the electric field are controlled to be higher in flue gas level, so that the control is very difficult in practice.
The main component of flue gas dust of the coal-fired industrial kiln is fly ash, the fly ash is a coal combustion product, and the components of the fly ash are greatly different according to the sources and the components of the combustion coal, but all the fly ash contains a large amount of silicon dioxide (SiO)2 ) (amorphous and crystalline), alumina (Al2 O3 ) And calcium oxide (CaO) is a major mineral compound in coal-bearing rock formations, and observation with a scanning electron microscope according to the prior art and the like shows that fly ash is composed of a plurality of particles, wherein the beaded particles comprise five large varieties of hollow glass beads (floating beads), thick-wall and solid micro beads (sinking beads), iron beads (magnetic beads), carbon particles, irregular glass bodies and porous glass bodies, wherein the irregular glass bodies are one of more particles in the fly ash, and are mostly composed of various conglomerate particles with different degrees of sphericity and non-sphericity, and the particles are quickly solidified when suspended in exhaust gas, so that the fly ash particles are generally spherical, the size range of dust with the particle size is 0.5-300 μm, the dust with the particle size range is reduced to 1m/s through a variable cross-section flow field from 10-13m/s of the inlet section of a smoke box at 2-4s, and the flow field for rapid braking of the wind speed is reduced to 1m/s, and a dynamic field condition is created for stripping the dust and the gas.
The total resistance of the known electric dust collector is generally about 200Pa, and the inlet smoke box is the largest component for generating resistance, so that the function of the inlet smoke box of the electric dust collector is upgraded, and the potential influence problem of the increase of the resistance is controlled as much as possible.
The known inlet smoke box of the electric dust remover has the functions of transition from a flue to the dust remover, does not pursue dust removal capability, and is required to strengthen the dust removal capability in each link under the current potential requirement of ultra-low near zero emission of the dust emission concentration required by the electric dust remover, so that the dust removal capability of the inlet smoke box is improved, the dust concentration entering a first electric field can be reduced, the collection capability of the first electric field on fine dust is improved, and the overall performance of the electric dust remover is improved.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the invention discloses a composite flow field pre-dedusting inlet smoke box of an electric dust remover and a design method. In particular to a pre-dedusting device component of an inlet smoke box composite flow field of an electric dust remover.
The technical scheme is as follows: the composite flow field pre-dedusting inlet smoke box of the electric dust remover is provided with an inlet flange which is connected to the forefront part of the inlet smoke box shell and is connected with an expansion joint of an air inlet flue;
a small laminar flow plate, a turbulent flow plate and a large laminar flow plate are sequentially arranged in the inlet smoke box shell from front to back, and the small laminar flow plate and the large laminar flow plate are respectively composed of a porous flow equalizing module and a baffle plate which are arranged by vertical air flow and are used for secondarily distributing high-speed air flow from a flue to form a flat flow field;
the turbulent flow plate is internally provided with a labyrinth porous medium in a multi-character shape, a turbulent flow field is formed while formatting air flows passing in parallel or vertically, dust-containing flue gas is under the action of the turbulent flow field, the dust has a speed difference with the flue gas due to the action of gravity, the dust is intercepted and adhered in collision, the flue gas passes through holes of the labyrinth porous medium, fine dust is condensed into large particles in the collision process, and the dust is further collected by a first electric field under the reduction of dust concentration in the flue gas flow entering the first electric field;
the turbulence plate is connected with a vibration system for vibrating and intercepting adhered turbulent dust particles, and the vibration system is connected with a vibration control system for adjusting the running time, the stop time, the vibration frequency and the vibration intensity of the vibration system.
Further, the inlet flange is rectangular or circular in shape;
the inlet smoke box shell comprises an upper top plate, side plates and a lower bottom plate, the inlet smoke box shell is in a prismatic table shape, and the included angle between the side plates and the smoke flat line is larger than 60 degrees.
Further, the small laminar flow plate or the large laminar flow plate is 1-3 groups;
the hole patterns on the small laminar flow plate or the large laminar flow plate are divided into round holes, square holes and diamond holes, the depths of the round holes, the square holes and the diamond holes are the same as the thickness of the small laminar flow plate or the large laminar flow plate or the thickness is designed according to actual needs, and the depths of the round holes, the square holes and the diamond holes are not more than 50mm.
Further, the turbulence plates are 1-3 groups, W, V, chinese character 'ri' or 'mu' shaped are arranged in the turbulence plates, and the turbulence plates are vertically arranged.
Further, the vibration system has two forms, the first is a top vibration system, which is installed on top of the turbulence plate; the second is mechanical rapping;
the mechanical vibration scoring is in three forms, including: the device comprises a top flue gas external vibration system, a bottom flue gas external vibration system and a bottom flue gas internal vibration system.
Further, the top vibration system adopts an electromagnetic vibration control mode, and comprises an alternating current-to-direct current variable voltage power supply loop, a line matrix program control loop and a communication loop, wherein the line matrix adopts 4×6, 4×8, 4×10 and 4×20 control loops;
the top flue gas external vibration system, the bottom flue gas external vibration system and the bottom flue gas internal vibration system (5) all adopt mechanical vibration control modes, and the mechanical vibration control modes comprise a power supply loop, an operation, a stop time control loop and a communication loop, wherein a single-chamber or double-chamber electric dust collector is provided with a vibration power supply loop, and an electric dust collector of a 1000MW thermal power generating unit is provided with two vibration power supply loops for three parallel-connected chambers.
The invention further aims to provide a design method for realizing the pre-dedusting inlet smoke box of the composite flow field of the electric dust collector, which is used for reducing the dust concentration of the inlet of the first electric field and carrying out integral dust collection of the electric dust collector under the conditions of strengthening the uniform distribution of the flow field and improving the pre-dedusting by adopting CFD numerical simulation and object model design.
Further, CFD numerical simulation, thing mould design electrostatic precipitator complex flow field is dust removal import smoke box in advance includes: the method is characterized in that an electric field is not added, the air flow dynamics theory is utilized, physical dust removal is carried out, the dust removal effect is not influenced by dust specific resistance, flow equalization is carried out under the different influences of dust viscosity, particle size and wind speed, the aperture ratio design on a small laminar flow plate and a large laminar flow plate is carried out, and the labyrinth porous medium density and the multi-character design of the multi-character modeling of the turbulent flow plate arrangement are carried out.
Further, the design of the opening rate of the small laminar flow plate and the large laminar flow plate comprises the design of the hole type and the depth of the hole;
the hole pattern and the depth design of the hole comprise:
(1) Current resistance spectrum extraction of dust particles and flue gas: on the original resistance spectrograms of the closed small-layer flow plate and the large-layer flow plate, for dust particles of the small-layer flow plate and the large-layer flow plate, calculating the sum of resistance signal intensities in the corresponding original range in the time domain of each resistance spectrum in the range of the area 2 and the area 3, and constructing the current resistance spectrums of the dust particles of the small-layer flow plate and the large-layer flow plate; for the flue gas, in the range of the region 4, calculating the sum of resistance signal intensities in the corresponding original range in the time domain of each resistance spectrum, and constructing the current resistance spectrum of the flue gas;
(2) Characterization of depth structure of small laminar plate, large laminar plate hole type and hole: carrying out dust removal experiments on the closed small laminar flow plate and the large laminar flow plate, and dividing the small laminar flow plate and the large laminar flow plate after the dust removal experiments into 3 parts; testing dust particle adsorption after dust particle interception treatment to obtain specific surface area and pore diameter distribution parameters of a small laminar flow plate or a large laminar flow plate; secondly, carrying out saturated dust particle treatment and testing the current resistance spectrum of the dust particles; thirdly, saturated smoke treatment is carried out, and the current resistance spectrum of the smoke is tested;
(3) Resistivity ρ2 And (3) determining: determining the resistivity rho of saturated dust particles and saturated smoke according to the following formula2
Wherein V and S are the hole depth and the hole type specific surface area of the small laminar flow plate and the large laminar flow plate respectively, cm3 /g and m2 G, obtained by dust particle adsorption experiments; t (T)2LM Is the logarithmic average value of the current resistance spectrum when saturated dust particles or saturated smoke are adopted; t (T)2i Is the throughput; a is thati Is T2i Resistance signal intensity at time;
(4) Characterization of dust particles and smoke occurrence aperture: under the condition that the depths of the hole patterns and the holes of the small laminar flow plate and the large laminar flow plate are round holes, square holes and diamond holes, according to the obtained resistivity, the dust particle resistance spectrum of the airtight small laminar flow plate and the large laminar flow plate and the resistance spectrum of the smoke are combined, and the occurrence Kong Houdu d of the current dust particles and the smoke is represented:
d=4ρ2 T2
further, the labyrinth porous medium density design of the multi-character modeling comprises:
(1) Determining a density value q of the labyrinth porous medium according to the current dust concentration signal concentration value p of the flue gas;
(2) Let i=1, take S2 I to i+p-1 data, the rest is set to 0, S is calculated1 (1, 2, …, n) and S2 Cross correlation coefficient R of (i, i+1, i+2, …, i+p-1)i The method comprises the steps of carrying out a first treatment on the surface of the Signals received by front and rear end sensors of the labyrinth porous medium are respectively recorded as S1 And S is2 The total dust concentration of the signal is n,
(3) Let i=i+1, repeat (2) until i=n-p+1;
(4) Calculating Ri The corresponding I value is denoted as I2 Signal S2 (I2 ,I2 +1,I2 +2,…,I2 +p-1)S2 The area where the effective signal is located;
(5) Let i=1, take S1 I to i +p-1 data, put the rest to 0, calculate S1 (i, i+1, i+2, …, i+p-1) and S2 (I2 ,I2 +1,I2 +2,…,I2 Cross-correlation coefficient R of +p-1)i
(6) Let i=i+1, repeat (5) until i=n-p+1;
(7) Calculating Ri The corresponding I value is denoted as I1 Signal S1 (I1 ,I1 +1,I1 +2,…,I1 +p-1) is S1 The area where the effective signal is located;
the average of the number of interception concentrations of group 3 was taken as the final number of interception concentrations Corrmax And determining the concentration delta T of the current dust concentration of the flue gas at the front end and the rear end of the labyrinth porous medium by using the following formula:
ΔT=(Corrmax -n)/Fs
according to the obtained concentration delta T, calculating the final value of the current dust concentration source of the flue gas, wherein the density of the labyrinth porous medium is as follows:
L′=(L-vΔT)/2;
wherein L is the density of the labyrinth porous medium, and v is the flue gas speed.
By combining all the technical schemes, the invention has the advantages and positive effects that: the main technical means of the airflow field of the electric dust collector provided by the invention is that the airflow field distribution is simulated through CFD modeling, and after the shaping, the airflow field distribution is verified and revised through a physical model test, and the airflow field is amplified to industrial application for 1:1, actually measuring and correcting, wherein CFD simulation is basically consistent with physical test, thus obtaining an ideal uniform flow field and simultaneously achieving the effect of improving the pre-dedusting capacity. The invention makes the inlet flow field of the electric dust collector more uniform, makes the inlet smoke box have higher capability of removing dust of large particle dust and condensing small particle dust, reduces the dust concentration of the electric field, promotes the electric field to improve the collection capability of the fine dust, thereby improving the integral dust removing capability of the electric dust collector, and upgrading the functionality of the inlet smoke box but not at the cost of increasing the resistance. The invention has the beneficial application of technical upgrading and reconstruction of the known dust remover and direct technical application of newly-built dust remover.
The small laminar flow plate or the large laminar flow plate is used for secondarily distributing high-speed airflow from the flue to form a flat flow field; the turbulent flow plate is internally provided with a labyrinth porous medium in a multi-character shape, and formats air flow passing in parallel or vertically to form a turbulent flow field, dust-containing air flow suddenly changes due to wind speed and wind direction when passing through, and the dust is peeled off and attached to an obstacle by centrifugal force formed under the action of the suddenly changed wind speed and wind direction due to different inertia of the air and particles, so that the separation of the air and the dust is realized; the turbulence plate is connected with a vibration system which is connected with a vibration control system. The invention makes the inlet flow field of the electric dust collector more uniform, makes the inlet smoke box have higher capability of removing dust of large particle dust and condensing small particle dust, reduces the dust concentration of the electric field, promotes the electric field to improve the collection capability of the fine dust, thereby improving the integral dust removing capability of the electric dust collector, and upgrading the functionality of the inlet smoke box but not at the cost of increasing the resistance. Based on the functional structural design of the device, the working condition parameters affecting the performance such as different air inlet modes, dust characteristics and the like are subjected to data processing, and the composite flow field is subjected to computer calculation through the algorithm of the invention, so that the structural design diagram of the engineering application device is automatically generated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure;
FIG. 1 is a schematic diagram of a pre-dedusting inlet smoke box of a composite flow field of an electric precipitator adopting an upper air inlet mode, which is provided by the embodiment of the invention;
FIG. 2 is a schematic diagram of a pre-dedusting inlet smoke box of a composite flow field of an electric precipitator adopting a lower air inlet mode, which is provided by the embodiment of the invention;
FIG. 3 is a schematic diagram of a pre-dedusting inlet smoke box of a composite flow field of an electric precipitator adopting a smoke horizontal direction air inlet mode, which is provided by the embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of a pre-dedusting inlet smoke box of a composite flow field of the electric precipitator adopting a smoke horizontal direction air inlet mode provided in FIG. 3 according to an embodiment of the present invention;
FIG. 5 is a block diagram of a top vibration system provided by an embodiment of the present invention;
FIG. 6 is a block diagram of a vibrating system in bottom flue gas provided by an embodiment of the present invention;
in the figure: 1. a small laminar flow plate; 2. a turbulence plate; 3. a large laminar flow plate; 4. a top vibration system; 4-1, an electromagnetic vibrator; 4-2, a vibrator piston; 4-3, double-ended screws; 4-4, nuts; 4-5, sealing sleeve; 4-6, a gasket; 4-7, a grounding bolt; 4-8, a grounding wire; 4-9, tightly holding the clamp; 5. a bottom flue gas internal vibration system; 5-1, a transmission motor; 5-2, a vibrating hammer; 5-3, a vibrating rod; 6. a bottom flue gas external vibration system; 7. an inlet flange; 8. a suspension plate; 9. a suspension beam; 10. a limiting device; A. expansion joint of air inlet flue; B. an upper top plate; C. a side plate; D. a lower bottom plate.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
Embodiment 1, as shown in FIG. 1, the composite flow field pre-dedusting inlet smoke box of the electric precipitator provided by the embodiment of the invention comprises a small laminar flow plate 1, a turbulent flow plate 2, a large laminar flow plate 3, a top vibration system 4, an electromagnetic vibrator 4-1, a vibrator piston 4-2, a double-head screw 4-3, a nut 4-4 and a sealing sleeve 4-5; the device comprises a gasket 4-6, a grounding bolt 4-7, a grounding wire 4-8, a holding clamp 4-9, a bottom flue gas internal vibration system 5, a transmission motor 5-1, a vibrating hammer 5-2, a vibrating rod 5-3, a bottom flue gas external vibration system 6, an inlet flange 7, an expansion joint A of an air inlet flue, an upper top plate B, two side plates C and a lower bottom plate D;
the inlet flange 7 is positioned at the forefront part of the inlet smoke box shell, is connected with the expansion joint A of the air inlet flue at the forefront part of the inlet smoke box shell, and is connected with the inlet smoke box shell, the inlet flange 7 can be rectangular or circular in shape, and the sectional area of the inlet flange ensures that the air inlet smoke speed is not less than 11m/s and not more than 13m/s.
The inlet smoke box shell comprises an upper top plate B, two side plates C (two symmetrically arranged pieces) and a lower bottom plate D which form the shell of the device, the inlet smoke box shell is in a prismatic table shape, the included angle between the two side plates C and a smoke flat line is not less than 60 degrees, and the concentration value of smoke flowing through the smoke box shell is generally not less than 3 meters and not more than 6 meters.
The inlet smoke box shell is shaped in three modes of flat air inlet, lower air inlet and upper air inlet of smoke according to the air inlet flow direction. As shown in fig. 1,2 and 3;
the expansion joint A of the air inlet flue at the front part of the outlet flange 7 is connected with the inlet smoke box shell, and is connected with the first electric field of the electric dust collector, and the connecting surface is in sealing welding.
The small laminar flow plate 1 or the large laminar flow plate 3 is formed by arranging porous flow equalizing modules and baffle plates in 1-3 groups of vertical air flows, and the porous flow equalizing modules and the baffle plates are used for enabling high-speed air flows from a flue to be secondarily distributed in an inlet smoke box under certain resistance to form a flat flow field.
The hole patterns on the small laminar flow plate 1 or the large laminar flow plate 3 are divided into round holes, square holes and diamond holes, the depth of the holes is the thickness of the plate or the thickness of the special design, and the thickness is generally not more than 50mm.
The turbulent flow plate 2 is in a shape of 1-3 groups of ' W, V, chinese character ' ri ' and ' mu ', is vertically arranged, namely is formed by labyrinth porous media of parallel or vertical air flow, forms a turbulent flow field when the air flow is formatted, dust-containing flue gas has a speed difference between dust and flue gas under the action of the turbulent flow field due to the gravity action, the dust is intercepted and adhered by the turbulent flow plate 2 in collision, the air passes through medium holes of the turbulent flow plate 2, fine dust is condensed into large particles in the collision process, the dust concentration in the air flow entering the first electric field is reduced, and the dust is relatively easier to collect by the first electric field.
The embodiment of the invention provides a pre-dedusting inlet smoke box of a composite flow field of an electric precipitator, which further comprises: the suspension device comprises a laminar flow plate suspension and a turbulent flow plate 2 suspension, and specifically comprises a suspension plate 8 and a suspension beam 9 which are connected with the upper top plate B of the inlet smoke box shell, wherein the lower part of the suspension beam 9 is connected with the small laminar flow plate 1. As shown in fig. 4.
The embodiment of the invention provides a pre-dedusting inlet smoke box of a composite flow field of an electric precipitator, which further comprises: the limiting device 10 is that the limiting device 10 arranged at the lower part and the two sides of the small laminar flow plate 1 or the large laminar flow plate 3 or the turbulent flow plate 2 is generally formed by steel, channel steel or angle steel.
The vibration system has two forms, namely a top vibration system 4 and mechanical vibration;
the mechanical vibration scoring is in three forms: the first is a top flue gas external vibration system (not shown), the second is a bottom flue gas external vibration system 6, and the third is a bottom flue gas internal vibration system 5.
As shown in fig. 5, the top vibration system 4 comprises an electromagnetic vibrator 4-1, a vibrator piston 4-2, a double-ended screw 4-3, a nut 4-4 and a sealing sleeve 4-5; the device comprises a gasket 4-6, a grounding bolt 4-7, a grounding wire 4-8 and a clamping hoop 4-9;
the electromagnetic vibrator 4-1 is connected with the vibrator piston 4-2 through a double-headed screw 4-3 and a nut 4-4;
the sealing sleeve 4-5 and the gasket 4-6 are sleeved outside the vibrator piston 4-2; the sealing sleeve 4-5 is sleeved on the vibrator piston 4-2 through a tightly-holding clamp 4-9;
the washer 4-6 is connected with the outer shell of the vibrator piston 4-2 through the nut 4-4, the grounding bolt 4-7 and the grounding wire 4-8;
as shown in fig. 6, the bottom in-flue gas vibration system 5 includes: a transmission motor 5-1, a vibrating hammer 5-2 and a vibrating rod 5-3;
the driving motor 5-1 is connected with the vibrating rod 5-3, and a plurality of vibrating hammers 5-2 are arranged on the vibrating rod 5-3;
the composite flow field pre-dedusting inlet smoke box of the electric precipitator provided by the embodiment of the invention further comprises: and the vibration control system is used for respectively controlling and adjusting the running time, the stop time, the vibration frequency and the vibration intensity of the top vibration system 4, the bottom flue gas external vibration system 6 and the bottom flue gas internal vibration system 5.
The top vibration system 4 adopts an electromagnetic vibration control mode, and comprises an alternating current-to-direct current transformation power supply loop, a line matrix program control loop and a communication loop, wherein the line matrix is generally 4×6, 4×8, 4×10, 4×20 and other algorithms.
The bottom flue gas external vibration system 6 and the bottom flue gas internal vibration system 5 are respectively in a mechanical vibration control mode, and comprise a power supply loop, an operation time control loop, a stop time control loop and a communication loop, wherein the power supply loop is used for one vibration of a general single-chamber or double-chamber electric precipitator, two vibration power supply loops are configured for the electric precipitator of the 1000MW thermal power generating unit, and each vibration is distributed with 1.5 electric precipitator composite flow field pre-dedusting inlet smoke boxes (horn mouth devices).
The dust removal efficiency of the device is influenced by factors such as dust particle size, instantaneous speed of smoke flowing through a composite flow field, viscosity of the dust, reynolds number of the smoke and the like, and according to experience, the dust removal efficiency of the device is not lower than 15%, and the dust removal efficiency can be verified from the increase of the dust collection amount of the first electric field before and after transformation.
The influence of the invention on the integral dust removal efficiency of the dust remover can be compared through the dust remover performance test before and after transformation, and the experience value is that the dust removal efficiency of the dust remover is improved by not less than 30%.
The embodiment shows that in order to break through the limitation of low homogenization flow field and dust removal capability of the traditional inlet smoke box of the electric dust collector, besides the basic functions of the traditional inlet smoke box shell and main body configuration, a low-resistance porous medium composite flow field pre-dust removal system device is developed through CFD numerical simulation, object model, industrial verification and other means, and has the effects of strengthening the uniform distribution of the flow field, improving the pre-dust removal capability, reducing the concentration of dust at the inlet of a first electric field and improving the overall dust removal efficiency of the electric dust collector.
The advantages of the invention include: the root mean square deviation of the airflow velocity is less than 0.2, the airflow distribution uniformity index reaches a high level, the surface area of the dust collecting device arranged in the inlet smoke box shell is equal to the surface area of the anode plate of an electric field, the overall dust removing efficiency of the inlet smoke box is not less than 15%, the dust removing efficiency of the inlet smoke box is 100% for dust with the particle size of more than 30 mu m, and the system resistance from the inlet flange 7 to the inlet section of the electric field is less than 100Pa.
The invention utilizes the inlet smoke box as the Venturi effect of the smoke transition section, and in a certain sense, the inlet smoke box has the function of a gravity settling chamber.
The invention is typically characterized in that: low resistance, uniform flow, pre-dedusting, and fine dust collision and agglomeration into large particle dust, and improves the dedusting efficiency of the electric precipitator system.
The core technology of the invention can be used for improving the efficiency of the traditional electric dust collector, and can also be directly used for newly building the electric dust collector as a whole.
The core technology of the invention can be used in the targeted smoke component field when different materials are selected, is used for smoke pretreatment, can be independently used as pretreatment equipment, and can also be used in combination with fine treatment equipment, such as an air preheater front section, a wet electric precipitator front section, a desulfurizing tower front section or a rear section.
The device does not add an electric field, utilizes the airflow dynamics theory, physically removes dust, has a dust removal effect which is not influenced by dust specific resistance, and can be specifically designed according to the characteristics of airflow and dust characteristics under the condition that the viscosity, the particle size and the wind speed of dust are different, and the core technical parameters such as the aperture ratio of a flow equalizing and dust collecting part, the density of a porous medium and the like.
Embodiment 2 of the present invention provides a design method of a pre-dedusting inlet smoke box of a composite flow field of an electric precipitator, including:
through CFD numerical simulation and object model design electrostatic precipitator complex flow field preliminary dedusting import smoke box, under strengthening flow field evenly distributed and improving preliminary dedusting, reduce first electric field import dust concentration, carry out the whole dust removal of electrostatic precipitator.
In the embodiment of the invention, the CFD numerical simulation and object model design electric precipitator composite flow field pre-dedusting inlet smoke box comprises: the method is characterized in that an electric field is not added, the air flow dynamics theory is utilized, physical dust removal is carried out, the dust removal effect is not influenced by dust specific resistance, flow equalization is carried out under the different influences of dust viscosity, particle size and wind speed, the aperture ratio design on the small laminar flow plate 1 and the large laminar flow plate 3 is carried out, and the labyrinth porous medium density and the multi-character design of the multi-character model are carried out by arranging the turbulent flow plates 2.
In the embodiment of the invention, the design of the opening ratio of the small laminar flow plate 1 and the large laminar flow plate 3 comprises the design of the hole type and the depth of the hole;
the hole pattern and the depth design of the hole comprise:
(1) Extracting the current resistance spectrum of dust particles and smoke: on the original resistance spectrograms of the closed small laminar flow plate 1 and the large laminar flow plate 3, for dust particles of the small laminar flow plate 1 and the large laminar flow plate 3, calculating the sum of resistance signal intensities in the corresponding original range in the time domain of each resistance spectrum in the range of the area 2 and the area 3, and constructing the current resistance spectrums of the dust particles of the small laminar flow plate 1 and the large laminar flow plate 3; for the flue gas, in the range of the region 4, calculating the sum of resistance signal intensities in the corresponding original range in the time domain of each resistance spectrum, and constructing the current resistance spectrum of the flue gas;
(2) And (3) hole type and hole depth structural characterization of the small laminar flow plate 1 and the large laminar flow plate 3: carrying out a dust removal experiment on the closed small laminar flow plate 1 and the large laminar flow plate 3, and dividing the small laminar flow plate 1 and the large laminar flow plate 3 after the dust removal experiment into 3 parts; testing dust particle adsorption after dust particle interception treatment to obtain specific surface area and pore diameter distribution parameters of the small laminar flow plate 1 or the large laminar flow plate 3; secondly, carrying out saturated dust particle treatment and testing the current resistance spectrum of the dust particles; thirdly, saturated smoke treatment is carried out, and the current resistance spectrum of the smoke is tested;
(3) Resistivity ρ2 And (3) determining: determining the resistivity rho of saturated dust particles and saturated smoke according to the following formula2
Wherein V and S are the hole depth and the hole type specific surface area of the small laminar flow plate 1 and the large laminar flow plate 3, respectively, cm3 /g and m2 G, obtained by dust particle adsorption experiments; t (T)2LM Is the pair of current resistance spectrums when saturated dust particles or saturated smokeA number average; t (T)2i Is the throughput; a is thati Is T2i Resistance signal intensity at time;
(4) Characterization of dust particles and smoke occurrence aperture: under the condition that the hole type and hole depth of the small laminar flow plate 1 and the large laminar flow plate 3 are round holes, square holes and diamond holes, according to the obtained resistivity, the dust particle resistance spectrum of the closed small laminar flow plate 1 and the large laminar flow plate 3 and the resistance spectrum of smoke are combined, and the occurrence Kong Houdu d of the current dust particles and smoke is represented:
d=4ρ2 T2
in an embodiment of the present invention, a labyrinth porous medium density design with a multiple-word shape includes:
(1) Determining a density value q of the labyrinth porous medium according to a current dust concentration signal concentration value p of the flue gas;
(2) Let i=1, take S2 I to i+p-1 data, the rest is set to 0, S is calculated1 (1, 2, …, n) and S2 Cross correlation coefficient R of (i, i+1, i+2, …, i+p-1)i The method comprises the steps of carrying out a first treatment on the surface of the Signals received by front and rear end sensors of the labyrinth porous medium are respectively recorded as S1 And S is2 The total dust concentration of the signal is n,
(3) Let i=i+1, repeat (2) until i=n-p+1;
(4) Calculating Ri The corresponding I value is denoted as I2 Signal S2 (I2 ,I2 +1,I2 +2,…,I2 +p-1)S2 The area where the effective signal is located;
(5) Let i=1, take S1 I to i+p-1 data, the rest is set to 0, S is calculated1 (i, i+1, i+2, …, i+p-1) and S2 (I2 ,I2 +1,I2 +2,…,I2 Cross-correlation coefficient R of +p-1)i
(6) Let i=i+1, repeat (5) until i=n-p+1;
(7) Calculating Ri The corresponding I value is denoted as I1 Signal S1 (I1 ,I1 +1,I1 +2,…,I1 +p-1) is S1 Is of the effective signalA region;
the average of the number of interception concentrations of group 3 was taken as the final number of interception concentrations Corrmax And determining the concentration delta T of the current dust concentration of the flue gas at the front end and the rear end of the labyrinth porous medium by using the following formula:
ΔT=(Corrmax -n)/Fs
according to the obtained concentration delta T, calculating the final value of the current dust concentration source of the flue gas, wherein the density of the labyrinth porous medium is as follows:
L′=(L-vΔT)/2;
wherein L is the density of the labyrinth porous medium, and v is the flue gas speed.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The content of the information interaction and the execution process between the devices/units and the like is based on the same conception as the method embodiment of the present invention, and specific functions and technical effects brought by the content can be referred to in the method embodiment section, and will not be described herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present invention. For specific working processes of the units and modules in the system, reference may be made to corresponding processes in the foregoing method embodiments.
Based on the technical scheme recorded in the embodiment of the invention, the following corresponding hardware equipment is further provided according to the algorithm of the device structure.
According to an embodiment of the present application, the present invention also provides a computer apparatus, including: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, which when executed by the processor performs the steps of any of the various method embodiments described above.
Embodiments of the present invention also provide a computer readable storage medium storing a computer program which, when executed by a processor, performs the steps of the respective method embodiments described above.
The embodiment of the invention also provides an information data processing terminal, which is used for providing a user input interface to implement the steps in the method embodiments when being implemented on an electronic device, and the information data processing terminal is not limited to a mobile phone, a computer and a switch.
The embodiment of the invention also provides a server, which is used for realizing the steps in the method embodiments when being executed on the electronic device and providing a user input interface.
Embodiments of the present invention also provide a computer program product which, when run on an electronic device, causes the electronic device to perform the steps of the method embodiments described above.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application implements all or part of the flow of the method of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing device/terminal apparatus, recording medium, computer Memory, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), electrical carrier signals, telecommunications signals, and software distribution media. Such as a U-disk, removable hard disk, magnetic or optical disk, etc.
While the invention has been described with respect to what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (10)

8. The design method according to claim 7, wherein the CFD numerical simulation and object model design electric precipitator composite flow field pre-dedusting inlet smoke box comprises: the method is characterized in that an electric field is not added, the air flow dynamics theory is utilized, physical dust removal is carried out, the dust removal effect is not influenced by dust specific resistance, flow equalization is carried out under the different influences of dust viscosity, particle size and wind speed, the aperture ratio design on a small laminar flow plate (1) and a large laminar flow plate (3) is carried out, and the labyrinth porous medium density and the multi-character modeling design of the multi-character modeling of the arrangement of the turbulent flow plates (2) are carried out.
(1) Current resistance spectrum extraction of dust particles and flue gas: on the original resistance spectrograms of the closed small laminar flow plate (1) and the large laminar flow plate (3), for dust particles of the small laminar flow plate (1) and the large laminar flow plate (3), calculating the sum of resistance signal intensities in the corresponding original range in the time domain of each resistance spectrum in the range of the area 2 and the area 3, and constructing the current resistance spectrums of the dust particles of the small laminar flow plate (1) and the large laminar flow plate (3); for the flue gas, in the range of the region 4, calculating the sum of resistance signal intensities in the corresponding original range in the time domain of each resistance spectrum, and constructing the current resistance spectrum of the flue gas;
(2) And (3) hole type and hole depth structural characterization of the small laminar flow plate (1) and the large laminar flow plate (3): carrying out dust removal experiments on the closed small laminar flow plate (1) and the large laminar flow plate (3), and dividing the small laminar flow plate (1) and the large laminar flow plate (3) after the dust removal experiments into 3 parts; testing dust particle adsorption after dust particle interception treatment to obtain specific surface area and pore diameter distribution parameters of a small laminar flow plate (1) or a large laminar flow plate (3); secondly, carrying out saturated dust particle treatment and testing the current resistance spectrum of the dust particles; thirdly, saturated smoke treatment is carried out, and the current resistance spectrum of the smoke is tested;
CN202311081273.9A2023-08-252023-08-25Inlet smoke box composite flow field pre-dedusting system and dedusting method of electric dust collectorPendingCN117797950A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
CN120126271A (en)*2025-05-152025-06-10赛特威尔电子股份有限公司 A smoke sensor maze optimization design and dust pollution resistance method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
CN120126271A (en)*2025-05-152025-06-10赛特威尔电子股份有限公司 A smoke sensor maze optimization design and dust pollution resistance method

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