技术领域technical field
本发明涉及脱硫技术领域，具体而言，涉及一种脱硫用罗茨风机调速装置及调速方法。The invention relates to the technical field of desulfurization, in particular to a speed regulating device and a speed regulating method of a Roots blower for desulfurization.
背景技术Background technique
在保证机组正常、稳定的运行同时，需要进一步优化系统结构，减少系统的能耗，在脱硫系统中采用必要的节能降耗措施，以减少脱硫系统的运行费用，将会产生一定程度上的经济效益和环境效应。在整个脱硫系统中，若脱硫剂为石灰石粉，氧化风机的电耗约占脱硫系统的10％；若脱硫剂为石灰石块，氧化风机的电耗约占脱硫系统的6～8％，氧化风机的电耗在脱硫系统的电耗中的比重也相对较大，节能降耗具有重大的意义。While ensuring the normal and stable operation of the unit, it is necessary to further optimize the system structure to reduce the energy consumption of the system, and adopt necessary energy-saving and consumption-reducing measures in the desulfurization system to reduce the operating cost of the desulfurization system, which will generate a certain degree of economic benefits and environmental effects. In the whole desulfurization system, if the desulfurizer is limestone powder, the power consumption of the oxidation fan accounts for about 10% of the desulfurization system; if the desulfurizer is limestone, the power consumption of the oxidation fan accounts for about 6-8% of the desulfurization system, and the oxidation fan The proportion of power consumption in the desulfurization system is also relatively large, so energy saving and consumption reduction are of great significance.
脱硫系统中的氧化风机主要分为罗茨风机、多级离心风机和单级高速离心风机三种形式，其中多级离心风机和单级高速离心风机的运行方式和控制方式基本上相同，罗茨风机与离心风机的运行不相同。罗茨鼓风机属于容积式气体压缩机，输送的风量与转数成比例。其工作原理是：由两个叶轮(或三叶)在箱体内互为反方向匀速旋转，使箱体和叶轮所包围着的一定量的气体由吸入的一侧输送到排出的一侧。罗茨鼓风机的主要特点是：1)叶轮和轴为整体结构，且叶轮无磨损，风机性能持久不变，可以长期连续运转；2)具有硬排气特性，压力变化时，流量变化很小，在设计压力范围内，管网阻力变化时其流量变化很小，适用于在流量要求稳定而阻力变化幅度较大的工作场合；3)由于罗茨鼓风机在工作过程中存在冲击脉动，导致罗茨鼓风机噪声较高，会给周围环境带来极大的影响。The oxidation fan in the desulfurization system is mainly divided into three types: Roots blower, multi-stage centrifugal fan and single-stage high-speed centrifugal fan. The operation and control methods of the multi-stage centrifugal fan and single-stage high-speed centrifugal fan are basically the same. Fans operate differently than centrifugal fans. The Roots blower is a volumetric gas compressor, and the air volume delivered is proportional to the number of revolutions. Its working principle is: two impellers (or three leaves) rotate at a constant speed in opposite directions in the box, so that a certain amount of gas surrounded by the box and the impeller is transported from the suction side to the discharge side. The main features of the Roots blower are: 1) The impeller and shaft are integral structures, and the impeller has no wear, the performance of the fan lasts unchanged, and it can run continuously for a long time; 2) It has a hard exhaust feature, and the flow rate changes little when the pressure changes. Within the design pressure range, when the resistance of the pipe network changes, the flow rate changes very little, which is suitable for working occasions where the flow requirement is stable and the resistance changes greatly; The blower noise is high, which will have a great impact on the surrounding environment.
目前脱硫用罗茨风机为固定状态运行，现场不会随着机组负荷以及现场的实际情况进行相应的调整运行，该运行方式在机组较大负荷运行或脱硫系统入口烟气参数与设计相匹配时运行情况合适，实际运行中易出现较大的能源浪费。为了保证脱硫系统安全、经济运行，脱硫用罗茨风机随着机组的运行负荷、烟气参数的变化需要进行调整。现有技术在氧化风机利旧改造时，增加了变频器，能够实现节电30％左右，虽然节电效果明显，但需增加变频器室及其配套设施，改造内容相对较多，投资也相对较大。同时，现有氧化风机所配电机均为异步电动机，虽然其运行稳定，故障率低，但从节能角度来看，异步电动机体现不出节能效果。At present, the Roots blower for desulfurization is operated in a fixed state, and the site will not adjust the operation according to the load of the unit and the actual situation on site. This operation mode is used when the unit is operating under a large load or the flue gas parameters at the inlet of the desulfurization system match the design. The operating conditions are suitable, and the actual operation is prone to large energy waste. In order to ensure the safe and economical operation of the desulfurization system, the Roots blower for desulfurization needs to be adjusted according to the operating load and flue gas parameters of the unit. In the existing technology, frequency converters are added when the oxidation fan is recycled, which can save about 30% of electricity. Although the power saving effect is obvious, it is necessary to increase the frequency converter room and its supporting facilities. The renovation content is relatively large, and the investment is relatively relatively large. larger. At the same time, the motors used for the existing oxidation fans are all asynchronous motors. Although they operate stably and have a low failure rate, from the perspective of energy saving, the asynchronous motors do not show energy-saving effects.
发明内容Contents of the invention
为解决上述问题，本发明的目的在于提供一种脱硫用罗茨风机调速装置及调速方法，无需增加变频室即可实现较好的节能效果。In order to solve the above problems, the object of the present invention is to provide a speed control device and a speed control method for Roots blower for desulfurization, which can achieve better energy saving effect without adding a frequency conversion room.
本发明提供了一种脱硫用罗茨风机调速装置，包括连接在永磁同步变频电机和罗茨风机之间的永磁耦合调速器，所述永磁耦合调速器包括：固定在所述永磁同步变频电机输出轴上的铜导体转子、固定在所述罗茨风机输入轴上的永磁体转子、用于调整所述铜导体转子和所述永磁体转子之间气隙厚度或者啮合面积的调节机构，以及用于驱动所述调节机构的调速驱动器；The invention provides a Roots blower speed regulating device for desulfurization, which includes a permanent magnet coupling speed governor connected between a permanent magnet synchronous variable frequency motor and a Roots blower, and the permanent magnet coupling speed governor includes: fixed on the The copper conductor rotor on the output shaft of the permanent magnet synchronous variable frequency motor, the permanent magnet rotor fixed on the input shaft of the Roots blower, are used to adjust the air gap thickness or meshing between the copper conductor rotor and the permanent magnet rotor an area adjustment mechanism, and a variable speed drive for driving said adjustment mechanism;
所述罗茨风机上设置有转速传感器，所述调速驱动器输入端与所述转速传感器及上位机连接，所述调速驱动器输出端与所述调节机构连接驱动所述调节机构动作；The Roots blower is provided with a rotational speed sensor, the input end of the speed regulating driver is connected with the rotational speed sensor and the host computer, and the output end of the speed regulating driver is connected with the regulating mechanism to drive the regulating mechanism to act;
其中，所述罗茨风机用于将氧化空气输送至脱硫吸收塔内将亚硫酸钙强制氧化，所述永磁同步变频电机与所述罗茨风机配套使用。Wherein, the Roots blower is used to transport the oxidized air to the desulfurization absorption tower to forcibly oxidize calcium sulfite, and the permanent magnet synchronous frequency conversion motor is used in conjunction with the Roots blower.
作为本发明进一步的改进，所述铜导体转子和所述永磁体转子均为圆盘式转子。As a further improvement of the present invention, both the copper conductor rotor and the permanent magnet rotor are disc rotors.
作为本发明进一步的改进，所述调节机构用于调节所述铜导体转子与所述永磁体转子之间的气隙厚度。As a further improvement of the present invention, the adjustment mechanism is used to adjust the thickness of the air gap between the copper conductor rotor and the permanent magnet rotor.
作为本发明进一步的改进，所述铜导体转子和所述永磁体转子均为筒形转子。As a further improvement of the present invention, both the copper conductor rotor and the permanent magnet rotor are cylindrical rotors.
作为本发明进一步的改进，所述调节机构用于调节所述铜导体转子与所述永磁体转子之间的啮合面积。As a further improvement of the present invention, the adjustment mechanism is used to adjust the meshing area between the copper conductor rotor and the permanent magnet rotor.
本发明还提供了一种脱硫用罗茨风机调速装置的调速方法，包括以下步骤：The present invention also provides a speed regulating method of a Roots blower speed regulating device for desulfurization, comprising the following steps:
步骤1，上位机根据脱硫系统所需氧化风的流量，计算出罗茨风机的理论转速；Step 1, the upper computer calculates the theoretical speed of the Roots blower according to the flow rate of the oxidation air required by the desulfurization system;
步骤2，所述罗茨风机上的转速传感器获取所述罗茨风机的当前转速，上位机结合步骤1中的理论转速，得到所述罗茨风机所需要的调整转速；Step 2, the speed sensor on the Roots blower obtains the current speed of the Roots blower, and the host computer combines the theoretical speed in step 1 to obtain the adjusted speed required by the Roots blower;
步骤3，所述调速驱动器根据接收到的调整转速的调整信号，将该调整信号转换成电流信号后驱动所述调节机构动作，所述调节机构调节固定在永磁同步变频电机输出轴上的铜导体转子和固定在所述罗茨风机输入轴上的永磁体转子之间的气隙厚度或啮合面积，改变所述铜导体转子和所述永磁体转子之间的传递转矩，从而改变所述罗茨风机的输出转速。Step 3. According to the received adjustment signal for adjusting the rotational speed, the speed-regulating driver converts the adjustment signal into a current signal and drives the adjustment mechanism to act. The adjustment mechanism adjusts the output shaft of the permanent magnet synchronous variable frequency motor. The air gap thickness or meshing area between the copper conductor rotor and the permanent magnet rotor fixed on the input shaft of the Roots blower changes the transmission torque between the copper conductor rotor and the permanent magnet rotor, thereby changing the Describe the output speed of the Roots blower.
作为本发明进一步的改进，步骤3中：当所述调整转速是降低转速时，所述调速驱动器驱动所述调节机构增大所述铜导体转子和所述永磁体转子之间的气隙厚度，所述铜导体转子远离所述永磁体转子，穿过所述铜导体转子的磁力线数量减小，感应磁场变小，此时，所述铜导体转子和所述永磁体转子之间的传递转矩变小，所述罗茨风机的输出转速变小；As a further improvement of the present invention, in step 3: when the adjusting speed is to reduce the speed, the speed regulating driver drives the regulating mechanism to increase the thickness of the air gap between the copper conductor rotor and the permanent magnet rotor , the copper conductor rotor is far away from the permanent magnet rotor, the number of magnetic field lines passing through the copper conductor rotor decreases, and the induced magnetic field becomes smaller. At this time, the transfer rotation between the copper conductor rotor and the permanent magnet rotor The torque becomes smaller, and the output speed of the Roots blower becomes smaller;
当所述调整转速是升高转速时，所述调速驱动器驱动所述调节机构减小所述铜导体转子和所述永磁体转子之间的气隙厚度，所述铜导体转子距离所述永磁体转子较近，穿过所述铜导体转子的磁力线数量增加，感应磁场变大，此时，所述铜导体转子和所述永磁体转子之间的传递转矩变大，所述罗茨风机的输出转速变大。When the adjusting speed is to increase the speed, the speed regulating driver drives the adjusting mechanism to reduce the thickness of the air gap between the copper conductor rotor and the permanent magnet rotor, and the distance between the copper conductor rotor and the permanent magnet rotor is The magnet rotor is closer, the number of magnetic force lines passing through the copper conductor rotor increases, and the induced magnetic field becomes larger. At this time, the transmission torque between the copper conductor rotor and the permanent magnet rotor becomes larger, and the Roots blower output speed increases.
作为本发明进一步的改进，步骤3中：当所述调整转速是降低转速时，所述调速驱动器驱动所述调节机构减小所述铜导体转子和所述永磁体转子之间的啮合面积，作用在所述铜导体转子的磁力线数量减小，感应磁场变小，此时，所述铜导体转子和所述永磁体转子之间的传递转矩变小，所述罗茨风机的输出转速变小；As a further improvement of the present invention, in step 3: when the adjusting speed is to reduce the speed, the speed regulating driver drives the regulating mechanism to reduce the meshing area between the copper conductor rotor and the permanent magnet rotor, The number of magnetic force lines acting on the copper conductor rotor decreases, and the induced magnetic field becomes smaller. At this time, the transmission torque between the copper conductor rotor and the permanent magnet rotor becomes smaller, and the output speed of the Roots blower becomes smaller. Small;
当所述调整转速是升高转速时，所述调速驱动器驱动所述调节机构增大所述铜导体转子和所述永磁体转子之间的啮合面积，作用在所述铜导体转子的磁力线数量增加，感应磁场变大，此时，所述铜导体转子和所述永磁体转子之间的传递转矩变大，所述罗茨风机的输出转速变大。When the adjusting speed is to increase the speed, the speed regulating driver drives the adjusting mechanism to increase the meshing area between the copper conductor rotor and the permanent magnet rotor, and the number of magnetic force lines acting on the copper conductor rotor increases, the induced magnetic field becomes larger, at this time, the transfer torque between the copper conductor rotor and the permanent magnet rotor becomes larger, and the output speed of the Roots blower becomes larger.
本发明的有益效果为：The beneficial effects of the present invention are:
1、罗茨风机能够实现0～25％的节能，甚至更多；1. Roots blower can achieve 0-25% energy saving, or even more;
2、罗茨风机的启动能够逐步运行，避免现场的突然启动和停止，能够更好地保护设备，增加设备及其零部件的使用寿命，减少现场检修维护量和维护费用；2. The startup of the Roots blower can be operated step by step, avoiding sudden start and stop on site, better protecting the equipment, increasing the service life of the equipment and its parts, and reducing the amount of on-site maintenance and maintenance;
3、永磁耦合调速器为机械零件，没有其他配件，减少后续的运行与维护成本；3. The permanent magnetic coupling governor is a mechanical part without other accessories, which reduces the subsequent operation and maintenance costs;
4、现场能够根据机组的实际运行情况调整的风机的运行状况，减少设备的浪费，降低现场的运行费用。4. The operation status of the fan can be adjusted on site according to the actual operation of the unit, reducing the waste of equipment and reducing the operation cost on site.
附图说明Description of drawings
图1为本发明实施例所述的一种脱硫用罗茨风机调速装置的示意图。Fig. 1 is a schematic diagram of a Roots blower speed regulating device for desulfurization according to an embodiment of the present invention.
图中，In the figure,
1、永磁同步变频电机；2、永磁耦合调速器；3、罗茨风机。1. Permanent magnet synchronous frequency conversion motor; 2. Permanent magnet coupling speed controller; 3. Roots blower.
具体实施方式Detailed ways
下面通过具体的实施例并结合附图对本发明做进一步的详细描述。The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.
实施例1，如图1所示，本发明实施例的一种脱硫用罗茨风机调速装置，其特征在于，包括连接在永磁同步变频电机1和罗茨风机3之间的永磁耦合调速器2，永磁耦合调速器2包括：固定在永磁同步变频电机1输出轴上的铜导体转子、固定在罗茨风机3输入轴上的永磁体转子、用于调整铜导体转子和永磁体转子之间气隙厚度或者啮合面积的调节机构，以及用于驱动调节机构的调速驱动器；Embodiment 1, as shown in FIG. 1 , a Roots blower speed regulating device for desulfurization according to the embodiment of the present invention is characterized in that it includes a permanent magnet coupling connected between the permanent magnet synchronous variable frequency motor 1 and the Roots blower 3 Governor 2, permanent magnet coupling governor 2 includes: copper conductor rotor fixed on the output shaft of permanent magnet synchronous variable frequency motor 1, permanent magnet rotor fixed on the input shaft of Roots blower 3, used to adjust the copper conductor rotor An adjustment mechanism for air gap thickness or meshing area with the permanent magnet rotor, and a speed-adjustable driver for driving the adjustment mechanism;
罗茨风机3上设置有转速传感器，调速驱动器输入端与转速传感器及上位机连接，调速驱动器输出端与调节机构连接驱动调节机构动作；The Roots blower 3 is provided with a speed sensor, the input end of the speed regulating driver is connected with the speed sensor and the host computer, and the output end of the speed regulating driver is connected with the regulating mechanism to drive the regulating mechanism to act;
罗茨风机3用于将氧化空气输送至脱硫吸收塔内将亚硫酸钙强制氧化，永磁同步变频电机1与罗茨风机3配套使用。The Roots blower 3 is used to deliver the oxidized air to the desulfurization absorption tower to forcibly oxidize calcium sulfite, and the permanent magnet synchronous frequency conversion motor 1 is used in conjunction with the Roots blower 3 .
本发明将配套使用的异步电机替换为永磁同步变频电机，具有以下特点：The present invention replaces the matching asynchronous motor with a permanent magnet synchronous variable frequency motor, which has the following characteristics:
(1)具有高效率、高节能经济运行特性范围宽的特点(负载在25～120％时，效率可达95％以上)，比如负载率为50％时，异步电机的效率下降到89％，永磁同步变频依然可以保持95％的高效。(1) It has the characteristics of high efficiency, high energy saving and wide range of economic operation characteristics (when the load is 25-120%, the efficiency can reach more than 95%). For example, when the load rate is 50%, the efficiency of the asynchronous motor drops to 89%. Permanent magnet synchronous frequency conversion can still maintain 95% high efficiency.
(2)具有高启动转矩、高嵌入转矩、高过载能力、高功率密度的特点，使得在永磁同步变频与变频器、或与永磁同步变频软启动器配合使用时，可以根据实际轴功率大大降低设备驱动电机的装机容量，减少了电机的空载损耗。(2) It has the characteristics of high starting torque, high embedded torque, high overload capacity and high power density, so that when the permanent magnet synchronous frequency conversion is used in conjunction with the frequency converter, or with the permanent magnet synchronous frequency conversion soft starter, it can be used according to the actual situation. The shaft power greatly reduces the installed capacity of the equipment drive motor and reduces the no-load loss of the motor.
(3)具有高功率因数的特点(功率因数可达98％以上)，使得供电系统中无需再提供无功，取消了无功功率补偿器，减少了设备投资和故障点。同时由于有功、无功电流的大幅下降(比同容量异步电机下降30％)，使得所有供电电缆截面、供电变压器、柜内母牌、开关等容量都会降低，减少设备投资的同时，减少了变压器及输电线路的损耗。(3) It has the characteristics of high power factor (the power factor can reach more than 98%), so that there is no need to provide reactive power in the power supply system, cancel the reactive power compensator, and reduce equipment investment and failure points. At the same time, due to the sharp drop in active and reactive current (30% lower than that of asynchronous motors with the same capacity), the capacity of all power supply cable sections, power supply transformers, master plates in cabinets, switches, etc. will be reduced, reducing equipment investment and reducing transformers. and transmission line losses.
(4)具有高可靠性、高互换性的特点，即与同容量的异步电机有相同的机座号和出线方式，使得永磁同步变频替换异步电机是非常简单方便。(4) It has the characteristics of high reliability and high interchangeability, that is, it has the same frame size and outlet mode as the asynchronous motor with the same capacity, making it very simple and convenient to replace the asynchronous motor with permanent magnet synchronous frequency conversion.
罗茨风机属于定容式回转鼓风机，相当于恒流源，转子在一定的转速下，当压升在允许的涉及范围内变化适用时，其流量几乎稳定不变，根据罗茨风机的流量的特性计算式：The Roots blower belongs to the constant-capacity rotary blower, which is equivalent to a constant current source. At a certain speed of the rotor, when the pressure rise changes within the allowable range, the flow rate is almost stable. According to the flow rate of the Roots blower Characteristic calculation formula:
式中，D为转子直径(m)，l为转子长度(m)，n为转子转速(r/min)，λv为容积系数，λv＝0.55～0.9。In the formula, D is the diameter of the rotor (m), l is the length of the rotor (m), n is the rotational speed of the rotor (r/min), λv is the volume coefficient, λv =0.55～0.9.
从上式可以看出，改变与罗茨风机连接的转子的速度即可改变流量。It can be seen from the above formula that the flow rate can be changed by changing the speed of the rotor connected to the Roots blower.
罗茨风机转速改变以后，其轴功率就相应改变，用下式计算：After the Roots fan speed changes, its shaft power will change accordingly, which is calculated by the following formula:
式中，ΔP为罗茨风机进出口压差，ηv、ηm为容积效率、机械传动效率。In the formula, ΔP is the pressure difference between the inlet and outlet of the Roots blower, andηv andηm are the volumetric efficiency and mechanical transmission efficiency.
从上式可以看出，罗茨风机的性能特点是转速和流量之间保持正比的关系，转速与功率也成正比关系，通过改变转速可以实现选择最佳工作点。改变罗茨风机转速可以实现选择最佳工作点的目标，合理控制使用风量即流量大小，根据罗茨风机转速与功率成正比的关系，罗茨风机的转速减小，罗茨风机需要消耗的电功率也下降，从而实现罗茨风机的节能降耗。It can be seen from the above formula that the performance characteristic of the Roots blower is that the speed and flow maintain a proportional relationship, and the speed and power are also proportional. By changing the speed, the best operating point can be selected. Changing the speed of the Roots blower can achieve the goal of selecting the best working point, and reasonably control the air volume used, that is, the flow rate. According to the relationship between the speed and power of the Roots blower, the speed of the Roots blower decreases, and the electrical power that the Roots blower needs to consume Also decreased, so as to realize the energy saving and consumption reduction of Roots blower.
本发明的永磁耦合调速器2可采用盘式永磁耦合调速器和筒形永磁耦合调速器。The permanent magnetic coupling speed governor 2 of the present invention can adopt a disc type permanent magnetic coupling speed governor and a cylindrical permanent magnetic coupling speed governor.
采用盘式永磁耦合调速器时，铜导体转子和永磁体转子均为圆盘式转子，此时，调节机构用于调节铜导体转子与永磁体转子之间的气隙厚度，通过气隙厚度的变化来调节铜导体转子和永磁体转子之间的传递转矩，从而完成罗茨风机3转速的调节。When the disc type permanent magnet coupling speed governor is used, both the copper conductor rotor and the permanent magnet rotor are disc rotors. At this time, the adjustment mechanism is used to adjust the thickness of the air gap between the copper conductor rotor and the permanent magnet rotor. The change of the thickness is used to adjust the transfer torque between the copper conductor rotor and the permanent magnet rotor, thereby completing the adjustment of the Roots blower 3 speed.
采用筒形永磁耦合调速器时，铜导体转子和永磁体转子均为筒形转子，此时，调节机构用于调节铜导体转子与永磁体转子之间的啮合面积，通过啮合面积的变化来调节铜导体转子和永磁体转子之间的传递转矩，从而完成罗茨风机3转速的调节。When the cylindrical permanent magnet coupling governor is used, both the copper conductor rotor and the permanent magnet rotor are cylindrical rotors. At this time, the adjustment mechanism is used to adjust the meshing area between the copper conductor rotor and the permanent magnet rotor. Through the change of the meshing area To adjust the transfer torque between the copper conductor rotor and the permanent magnet rotor, so as to complete the adjustment of the Roots blower 3 speed.
采用本发明的脱硫用罗茨风机调速装置后，脱硫系统及氧化风机节能降耗情况表如下：After adopting the Roots fan speed regulating device for desulfurization of the present invention, the energy-saving and consumption-reducing situation tables of the desulfurization system and the oxidation fan are as follows:
从结果可以看出，采用这种调速装置，风机能够实现0～25％的节能，甚至更多，风机的启动能够逐步运行，避免现场的突然启动和停止，能够更好地保护设备，增加设备及其零部件的使用寿命，减少现场检修维护量和维护费用。It can be seen from the results that with this speed control device, the fan can achieve energy saving of 0-25%, or even more. The service life of the equipment and its parts can be reduced, and the amount of on-site maintenance and maintenance costs can be reduced.
实施例2，一种脱硫用罗茨风机调速装置的调速方法，包括以下步骤：Embodiment 2, a kind of speed regulating method of Roots fan speed regulating device for desulfurization, comprises the following steps:
步骤1，上位机根据脱硫系统所需氧化风的流量，计算出罗茨风机3的理论转速；Step 1, the host computer calculates the theoretical rotational speed of the Roots blower 3 according to the flow rate of the oxidizing air required by the desulfurization system;
步骤2，罗茨风机3上的转速传感器获取罗茨风机3的当前转速，上位机结合步骤1中的理论转速，得到罗茨风机3所需要的调整转速；Step 2, the rotational speed sensor on the Roots blower 3 acquires the current rotational speed of the Roots blower 3, and the host computer combines the theoretical rotational speed in step 1 to obtain the adjusted rotational speed required by the Roots blower 3;
步骤3，调速驱动器根据接收到的调整转速的调整信号，将该调整信号转换成电流信号后驱动调节机构动作，调节机构调节固定在永磁同步变频电机1输出轴上的铜导体转子和固定在罗茨风机3输入轴上的永磁体转子之间的气隙厚度或啮合面积，改变铜导体转子和永磁体转子之间的传递转矩，从而改变罗茨风机的输出转速。Step 3: According to the received adjustment signal for adjusting the speed, the speed control driver converts the adjustment signal into a current signal and drives the adjustment mechanism to act. The adjustment mechanism adjusts the copper conductor rotor fixed on the output shaft of the permanent magnet synchronous variable frequency motor 1 and the fixed The thickness of the air gap or the meshing area between the permanent magnet rotors on the input shaft of the Roots blower 3 changes the transfer torque between the copper conductor rotor and the permanent magnet rotor, thereby changing the output speed of the Roots blower.
本发明的永磁耦合调速器2可采用盘式永磁耦合调速器和筒形永磁耦合调速器。The permanent magnetic coupling speed governor 2 of the present invention can adopt a disc type permanent magnetic coupling speed governor and a cylindrical permanent magnetic coupling speed governor.
当采用盘式永磁耦合调速器时，铜导体转子和永磁体转子均为圆盘式转子，此时，调节机构用于调节铜导体转子与永磁体转子之间的气隙厚度，通过气隙厚度的变化来调节铜导体转子和永磁体转子之间的传递转矩，从而完成罗茨风机3转速的调节。步骤3中具体的调节方式为：When the disc-type permanent magnet coupling governor is used, both the copper conductor rotor and the permanent magnet rotor are disc rotors. At this time, the adjustment mechanism is used to adjust the thickness of the air gap between the copper conductor rotor and the permanent magnet rotor. The change of the thickness of the gap is used to adjust the transfer torque between the copper conductor rotor and the permanent magnet rotor, thereby completing the adjustment of the Roots blower 3 speed. The specific adjustment method in step 3 is:
当调整转速是降低转速时，调速驱动器驱动调节机构增大铜导体转子和永磁体转子之间的气隙厚度，铜导体转子远离永磁体转子，穿过铜导体转子的磁力线数量减小，感应磁场变小，此时，铜导体转子和永磁体转子之间的传递转矩变小，罗茨风机的输出转速变小；When adjusting the speed is to reduce the speed, the speed control driver drives the adjustment mechanism to increase the thickness of the air gap between the copper conductor rotor and the permanent magnet rotor. The magnetic field becomes smaller, at this time, the transfer torque between the copper conductor rotor and the permanent magnet rotor becomes smaller, and the output speed of the Roots blower becomes smaller;
当调整转速是升高转速时，调速驱动器驱动调节机构减小铜导体转子和永磁体转子之间的气隙厚度，铜导体转子距离永磁体转子较近，穿过铜导体转子的磁力线数量增加，感应磁场变大，此时，铜导体转子和永磁体转子之间的传递转矩变大，罗茨风机的输出转速变大。When the speed is adjusted to increase the speed, the speed control driver drives the adjustment mechanism to reduce the thickness of the air gap between the copper conductor rotor and the permanent magnet rotor. The copper conductor rotor is closer to the permanent magnet rotor, and the number of magnetic force lines passing through the copper conductor rotor increases. , the induced magnetic field becomes larger, at this time, the transmission torque between the copper conductor rotor and the permanent magnet rotor becomes larger, and the output speed of the Roots blower becomes larger.
当采用筒形永磁耦合调速器时，铜导体转子和永磁体转子均为筒形转子，此时，调节机构用于调节铜导体转子与永磁体转子之间的啮合面积，通过啮合面积的变化来调节铜导体转子和永磁体转子之间的传递转矩，从而完成罗茨风机3转速的调节。步骤3中具体的调节方式为：When the cylindrical permanent magnet coupling speed governor is used, both the copper conductor rotor and the permanent magnet rotor are cylindrical rotors. At this time, the adjustment mechanism is used to adjust the meshing area between the copper conductor rotor and the permanent magnet rotor. Change to adjust the transfer torque between the copper conductor rotor and the permanent magnet rotor, so as to complete the adjustment of the Roots blower 3 speed. The specific adjustment method in step 3 is:
当调整转速是降低转速时，调速驱动器驱动调节机构减小铜导体转子和永磁体转子之间的啮合面积，作用在铜导体转子的磁力线数量减小，感应磁场变小，此时，铜导体转子和永磁体转子之间的传递转矩变小，罗茨风机的输出转速变小；When the speed is adjusted to reduce the speed, the speed-adjusting driver drives the adjustment mechanism to reduce the meshing area between the copper conductor rotor and the permanent magnet rotor, the number of magnetic force lines acting on the copper conductor rotor decreases, and the induced magnetic field becomes smaller. At this time, the copper conductor The transmission torque between the rotor and the permanent magnet rotor becomes smaller, and the output speed of the Roots blower becomes smaller;
当调整转速是升高转速时，调速驱动器驱动调节机构增大铜导体转子和永磁体转子之间的啮合面积，作用在铜导体转子的磁力线数量增加，感应磁场变大，此时，铜导体转子和永磁体转子之间的传递转矩变大，罗茨风机的输出转速变大。When the speed is adjusted to increase the speed, the speed control driver drives the adjustment mechanism to increase the meshing area between the copper conductor rotor and the permanent magnet rotor, the number of magnetic force lines acting on the copper conductor rotor increases, and the induced magnetic field becomes larger. At this time, the copper conductor The transmission torque between the rotor and the permanent magnet rotor becomes larger, and the output speed of the Roots blower becomes larger.
本发明脱硫用的罗茨风机搭配永磁同步变频电机，增加的配套设施少，无需对原有脱硫系统进行大量改造，投资成本小，并采用永磁耦合调速器调速，能够实现风机较大的节能效果，避免了脱硫系统运行中的能源浪费。The Roots blower used for desulfurization in the present invention is matched with a permanent magnet synchronous frequency conversion motor, which requires few additional supporting facilities, does not require a large number of modifications to the original desulfurization system, and has low investment costs. Great energy-saving effect, avoiding energy waste in the operation of the desulfurization system.
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810458358.7ACN108443153A (en) | 2018-05-14 | 2018-05-14 | A kind of desulfurization roots blower speed regulation device and speed regulating method |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810458358.7ACN108443153A (en) | 2018-05-14 | 2018-05-14 | A kind of desulfurization roots blower speed regulation device and speed regulating method |
| Publication Number | Publication Date |
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| CN108443153Atrue CN108443153A (en) | 2018-08-24 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810458358.7APendingCN108443153A (en) | 2018-05-14 | 2018-05-14 | A kind of desulfurization roots blower speed regulation device and speed regulating method |
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| CN (1) | CN108443153A (en) |
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