Optimization method of electrostatic precipitator operation

Abstract

The present invention aims at the problem that the electrostatic precipitator systems in the prior art are all uniformly controlled and coordinated by a distributed control system or a computer control system, and the optimization control has poor real-time control capability and untimely dynamic response. The present invention proposes an electrostatic precipitator operation optimization method, including a data acquisition system and a high-voltage power supply operation optimization system; the high-voltage power supply operation optimization system includes a plurality of parallel operation optimization groups, and the operation optimization group includes a plurality of high-voltage power supply control systems, a high-voltage power supply and a high-voltage electric field for the electrostatic precipitator. The present invention cancels the distributed control system or computer control system for uniformly controlling and deploying the high-voltage power supply control system, avoiding the problem that the entire electrostatic precipitator system cannot operate normally due to a failure of the distributed control system or the computer control system, and each high-voltage power supply control system cooperates with each other for control, the transmission link of the control signal is shorter, and the dynamic response is more timely.

Description

Technical Field

[0001] The invention belongs to the technical field of electrostatic precipitators, and in particular relates to an electrostatic precipitator operation optimization method. Background Art

[0002] An electrostatic precipitator system includes many high-voltage power supplies. Each high-voltage power supply has an independent embedded control system responsible for controlling the high-voltage power supply of the electrostatic precipitator electric field and adjusting the voltage and current output of a single electric field according to changes in working conditions. At the same time, the embedded control system of each high-voltage power supply is connected to the distributed control system or computer control system through a communication bus. For example, the patent number is CN202210262328.5, and the patent name is the invention patent of energy-saving optimization method and optimization system of electrostatic precipitator system of thermal power unit. Since the distributed control system or computer control system is a third-party software and hardware platform, there is a big difference between an electrostatic precipitator system and the embedded control system of the high-voltage power supply. In order to realize the optimization control of the high-voltage power supply on the distributed control system or computer control system, the electrostatic precipitator system can only modify the secondary voltage and current limit values ​​of the high-voltage power supply in operation through the communication bus according to the boiler load signal, the turbidity signal of the outlet, etc., which affects the output of the high-voltage power supply. There are problems such as poor real-time control capability of optimization control, untimely dynamic response, and single optimization method. At the same time, the high-voltage power supply embedded control system was originally designed according to standardization, and the control method was mainly designed according to the power supply system. In addition, the high-voltage power supply mainly solves the power supply problem of a single electric field, which leads to great limitations in the optimization control of the embedded system. Summary of the invention

[0003] Aiming at the problems in the prior art that the electrostatic precipitator systems are all uniformly controlled and coordinated by a distributed control system or a computer control system, the optimization control has poor real-time control capability and untimely dynamic response, the present invention proposes an electrostatic precipitator operation optimization method.

[0004] The invention object of the present invention is achieved through the following technical solutions: an electrostatic precipitator operation optimization method, a high-voltage power supply operation optimization system is composed of a plurality of operation optimization groups with the same total power, the operation optimization group includes a plurality of high-voltage electric fields connected end to end, each high-voltage electric field is powered by a separate high-voltage power supply, and each high-voltage electric field and the corresponding high-voltage power supply are configured with a separate high-voltage power supply control system for control;

[0005] The target power of each high-voltage electric field in the operation optimization group is different;

[0006] The electrostatic precipitator is also provided with a data acquisition system for collecting the real-time flow rate of the electrostatic precipitator flue gas inlet, the real-time emission value of the flue gas outlet, the emission standard of the flue gas outlet, the boiler load signal, and the coal type information, and transmitting the collected information to each high-voltage power supply control system, and determining the rated target output power of each high-voltage power supply control system in the operation optimization group according to the various parameters of the data acquisition system;

[0007] The high-voltage power supply control systems within the operation optimization group share parameters and operation data with each other, and monitor each other to see if there are any abnormalities in the operation of the high-voltage electric field;

[0008] When an abnormal power drop occurs in a high-voltage electric field within a single operation optimization group, the remaining high-voltage power supply control systems within the operation optimization group increase the output power of the controlled high-voltage electric field according to the priority to ensure that the total power target of the operation optimization group remains unchanged;

[0009] The priority is determined according to the distance between the high-voltage electric field in the operation optimization group and the flue gas inlet, and the high-voltage electric field closest to the flue gas inlet has the highest priority.

[0010] In the above scheme, the high-voltage power supply operation optimization system is composed of several high-voltage power supply control systems, which independently control the operation of their respective electric fields, and perform more refined operation optimization through each high-voltage power supply control system, so as to achieve better energy conservation and emission reduction effects. In addition, the distributed control system or computer control system for unified control and deployment of these high-voltage power supply control systems is eliminated, so as to avoid the problem that the entire electrostatic precipitator system cannot operate normally due to failure of the distributed control system or computer control system, and improve the reliability of the control of the entire electrostatic precipitator system. In addition, each high-voltage power supply control system cooperates with each other for control, the transmission link of the control signal is shorter, the dynamic response is more timely, and the accuracy of control will be greatly improved.

[0011] Preferably, the high-voltage power supply control system is connected by a ring network topology structure communication. The ring network topology structure ensures that when one of the high-voltage power supply control systems in the operation optimization system fails, other high-voltage power supply control systems in the same operation optimization system can also receive signals from other high-voltage power supply control systems, ensuring that the communication of the remaining high-voltage power supply control systems is normal.

[0012] Preferably, the monitoring module of the high-voltage power supply control system monitors the operating conditions of the high-voltage electric field and the high-voltage power supply in real time, and compares the rated operating condition parameters set by the power supply control module of the high-voltage power supply control system. If the operating condition parameters of the monitoring module do not match the rated operating condition parameters of the power supply control module, the operation of the high-voltage electric field becomes abnormal.

[0013] Preferably, the high voltage power supply control system includes

[0014] Communication module for receiving real-time data from data acquisition system and sharing control parameters and operation data of the same optimization group.

[0015] Monitoring module for collecting real-time operating data of high-voltage power supply and high-voltage electric field.

[0016] A power control module for controlling the power output of the high-voltage power supply to the high-voltage electric field,

[0017] A distribution module for allocating high voltage power supply control priorities within the same operation optimization group,

[0018] A power compensation module is used to compensate for operating power loss when other high-voltage electric fields in the same operation optimization group have insufficient operating power.

[0019] Preferably, the data collected by the monitoring module include the input voltage, input current, bus voltage, high-voltage electric field secondary voltage, high-voltage electric field secondary current, dust collecting area of ​​the high-voltage electric field anode plate, type of high-voltage electric field discharge electrode, and total length of the high-voltage electric field discharge electrode.

[0020] Preferably, the parameters set by the power control module include a secondary voltage rated value, a secondary current rated value, a secondary voltage setting value, a secondary current setting value, and an operating frequency setting value of the high voltage electric field.

[0021] Preferably, the power compensation module is used to compensate for abnormal power output difference caused by abnormal output power of other high-voltage electric fields within the same operation optimization system.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention eliminates the distributed control system or computer control system for uniformly controlling and deploying the high-voltage power supply control system, thereby avoiding the problem that the entire electrostatic precipitator system cannot operate normally due to a failure of the distributed control system or computer control system, and improving the reliability of the control of the entire electrostatic precipitator system. In addition, each high-voltage power supply control system cooperates with each other for control, the transmission link of the control signal is shorter, the dynamic response is more timely, and the accuracy of the control is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structure diagram of the system for optimizing the operation of electrostatic precipitator;

[0025] Figure 2 To provide a structural diagram of the operation optimization team;

[0026] Figure 3 This is the internal structure schematic diagram of the high voltage power supply control system;

[0027] Figure 4Flowchart of the optimization method for the operation optimization team. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0029] like Figure 1 , Figure 2 , Figure 3 As shown, an electrostatic precipitator operation optimization system includes a data acquisition system and a high-voltage power supply operation optimization system; the high-voltage power supply operation optimization system includes multiple parallel operation optimization groups, the operation optimization group includes multiple high-voltage power supply control systems, high-voltage power supplies and high-voltage electric fields for electrostatic precipitators, the high-voltage power supply control system is connected to the high-voltage power supply, and the high-voltage power supply provides high-frequency power to the high-voltage electric field for electrostatic precipitators. The high-voltage electric fields in the same optimization group are connected in sequence. The high-voltage power supply control systems in the operation optimization group are connected to each other to form a ring network topology structure. Ensure that if one of the high-voltage power supply control systems in the operation optimization system fails, the other high-voltage power supply control systems in the same operation optimization system can receive signals from other high-voltage power supply control systems to ensure that the communication of the remaining high-voltage power supply control systems is normal.

[0030] An electrostatic precipitator operation optimization method, a high-voltage power supply operation optimization system is composed of a plurality of operation optimization groups with the same total power, the operation optimization group includes a plurality of high-voltage electric fields connected end to end, each high-voltage electric field is powered by a separate high-voltage power supply, and each high-voltage electric field and the corresponding high-voltage power supply are configured with a separate high-voltage power supply control system;

[0031] The target power of each high-voltage electric field in the operation optimization group is different;

[0032] The electrostatic precipitator is also provided with a data acquisition system for collecting the real-time flow rate of the electrostatic precipitator flue gas inlet, the real-time emission value of the flue gas outlet, the emission standard of the flue gas outlet, the boiler load signal, and the coal type information, and transmitting the collected information to each high-voltage power supply control system, and determining the rated target output power of each high-voltage power supply control system in the operation optimization group according to the various parameters of the data acquisition system;

[0033] The high-voltage power supply control systems within the operation optimization group share parameters and operation data with each other, and monitor each other to see if there are any abnormalities in the operation of the high-voltage electric field;

[0034] When an abnormal power drop occurs in a high-voltage electric field within a single operation optimization group, the remaining high-voltage power supply control systems within the operation optimization group increase the output power of the controlled high-voltage electric field according to the priority to ensure that the total power target of the operation optimization group remains unchanged;

[0035] The priority is determined according to the distance between the high-voltage electric field in the operation optimization group and the flue gas inlet, and the high-voltage electric field closest to the flue gas inlet has the highest priority.

[0036] The above-mentioned high voltage power supply control system includes a communication module for receiving real-time data from a data acquisition system and for sharing control parameters and operation data of the same optimization group.

[0037] Monitoring module for collecting real-time operating data of high-voltage power supply and high-voltage electric field.

[0038] A power control module for controlling the power output of the high-voltage power supply to the high-voltage electric field,

[0039] A distribution module for allocating high voltage power supply control priorities within the same operation optimization group,

[0040] A power compensation module is used to compensate for operating power loss when other high-voltage electric fields in the same operation optimization group have insufficient operating power.

[0041] The parameters set by the above power control module include the secondary voltage rated value, secondary current rated value, secondary voltage setting value, secondary current setting value and operating frequency setting value of the high voltage electric field.

[0042] The above data acquisition system collects the real-time flow rate of the flue gas inlet of the electrostatic precipitator, the real-time emission value of the flue gas outlet, the flue gas outlet emission standard, the boiler load signal, and the coal type information, and transmits the collected information to each high-voltage power supply control system.

[0043] The operation optimization group in this embodiment is composed of 5 high-voltage electric fields, each of which is powered by a high-voltage power supply alone, and each high-voltage power supply is controlled by a high-voltage power supply control system. The more high-voltage electric fields there are in the same operation optimization group, the better the dust removal effect of the electrostatic precipitator system is, and the higher the environmental requirements of the flue gas discharged by the electrostatic precipitator system are, the more the number of high-voltage electric fields in the same operation optimization group can be increased or decreased according to environmental protection requirements in the specific implementation. The 5 high-voltage electric field equipment in this embodiment are numbered as high-voltage electric field 1, high-voltage electric field 2, high-voltage electric field 3, high-voltage electric field 4, and high-voltage electric field 5, respectively, and the corresponding high-voltage power supply numbers are high-voltage power supply 1, high-voltage power supply 2, high-voltage power supply 3, high-voltage power supply 4, and high-voltage power supply 5, and the corresponding high-voltage power supply control system numbers are control system 1, control system 2, control system 3, control system 4, and control system 5. The number of the high-voltage power supply control system is also the priority level of the high-voltage power supply control system in the operation optimization group, and the control system 1 has the highest priority and the control system 5 has the lowest priority. Before operation, the operation power target value of each high-voltage electric field in the operation optimization group is set by the high-voltage power supply control system, as shown in Table 1.

[0044] Table 1 Target power of each high voltage electric field in the same operation optimization system

[0045] name High voltage electric field 1 High voltage electric field 2 High voltage electric field 3 High voltage electric field 4 High voltage electric field 5 Electric field identification 1 2 3 4 5 Priority 1 2 3 4 5 Power target value 55% rated 50% rated 45% rated 40% rated 38% rated

[0046] In each high-voltage electric field of the operation optimization group, the flue gas first flows into the high-voltage electric field marked 1, then into the high-voltage electric field marked 2, and so on. The dust in the flue gas of the high-voltage electric field marked 1 has never been treated, so the dust content in the flue gas is the highest. After the flue gas of the high-voltage electric field marked 1 is treated, the flue gas flows into the high-voltage electric field marked 2. At this time, the dust in the flue gas has been greatly reduced. The dust content of the flue gas of the subsequent high-voltage electric fields is reduced step by step. When it reaches the flue gas outlet, the dust meets the emission standard. Therefore, the power required for the operation of high-voltage electric fields with different marks in each column of electric fields is different.

[0047] Electrostatic precipitator system operation:

[0048] like Figure 4 As shown, the data acquisition system will collect the real-time flow rate of the flue gas inlet of the electrostatic precipitator, the real-time emission value of the flue gas outlet, the emission standard of the flue gas outlet, the boiler load signal, and the coal type information, and transmit the collected information to each high-voltage power supply control system. The coal type information includes the designed coal type calorific value, the current coal type calorific value and the current coal type ash content specific resistance. The current coal type ash content specific resistance value is different, and there will be different resistance characteristics. When the dust specific resistance is high, the high-resistance dust is not easy to charge in the high-voltage electric field, and it is easy to produce back corona. The high-voltage power supply adopts a pulse power supply mode to adapt to this dust and meet the emission standards. In the continuous power supply mode, the high-voltage power supply frequency is linearly increased and decreased from 0 to 30000HZ, and adjusted to the target value of the single high-voltage power supply operation power. The output high-voltage voltage value is stable, and the DC ripple fluctuation is small, which is suitable for dust with normal dust specific resistance. In pulse power supply mode, the frequency of the high-voltage power supply changes in a jumpy manner. The high-voltage power supply is controlled by period, pulse width, and duty cycle parameters and adjusted to the target operating power value of a single high-voltage power supply. The output high-voltage voltage value fluctuates greatly, and there is a huge difference between the voltage peak and the voltage valley. When the output voltage peaks, a large current is generated for rapid charging of high-resistance dust in the high-voltage electric field. The voltage valley is prone to small current output suppression to produce back corona.

[0049] When the output power of the high-voltage power supply is increased, it is easy to encounter high-voltage breakdown of the high-voltage electric field of the electrostatic precipitator, resulting in frequent flashovers, and even causing a short circuit in the electric field, resulting in the real-time output power of the high-voltage power supply failing to reach the target value of the high-voltage output power of the current high-voltage electric field. The embedded control system of the high-voltage power supply of the same operation optimization group can obtain the shared parameters of the high-voltage power supplies of other high-voltage electric fields in the group in real time. When it is found that the output power of the high-voltage power supply of other high-voltage electric fields is insufficient due to working conditions, it will increase the output of its own high-voltage power supply according to the priority level, and compensate the high-voltage electric field with insufficient output power to ensure the dust removal efficiency. Compensation priority description: When the high-voltage electric field marked 1 is abnormal, compensation is sorted according to the priority of 2-3-4-5; when the high-voltage electric field marked 2 is abnormal, compensation is sorted according to the priority of 1-3-4-5; when the high-voltage electric field marked 3 is abnormal, compensation is sorted according to the priority of 1-2-4-5; when the high-voltage electric field marked 4 is abnormal, compensation is sorted according to the priority of 1-2-3-5; when the high-voltage electric field marked 5 is abnormal, compensation is sorted according to the priority of 1-2-3-4.

[0050] When abnormal operating conditions occur in multiple high-voltage electric fields within the same optimization group and the actual operating value cannot reach the power target value, all target difference values ​​are accumulated, and the high-voltage electric fields that are operating normally perform power compensation for the target value difference according to their priority.

[0051] When a high-voltage electric field in normal operating state is providing power compensation to a high-voltage electric field in abnormal operating state, it enters an abnormal state due to the increase in high-voltage power supply output. Then, the high-voltage electric field exits the compensation state, returns to the power target value, and is compensated by other high-voltage electric fields with lower priority.

[0052] After the high-voltage electric field under abnormal operating conditions resumes normal operation, the high-voltage electric field participating in power compensation exits the compensation state and resumes operation at the power target value.

[0053] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A method for optimizing the operation of an electrostatic precipitator, characterized in that: The high-voltage power supply operation optimization system is composed of a number of operation optimization groups with the same total power, wherein the operation optimization group includes a number of high-voltage electric fields connected end to end, each high-voltage electric field is powered by a separate high-voltage power supply, and each high-voltage electric field and the corresponding high-voltage power supply are configured with a separate high-voltage power supply control system; The target power of each high-voltage electric field in the operation optimization group is different; The electrostatic precipitator is also equipped with a data acquisition system for collecting the real-time flow rate of the electrostatic precipitator flue gas inlet, the real-time emission value of the flue gas outlet, the emission standard of the flue gas outlet, the boiler load signal, and the coal type information, and transmitting the collected information to the data acquisition system of each high-voltage power supply control system, and determining the rated target output power of each high-voltage power supply control system in the operation optimization group according to the various parameters of the data acquisition system; The high-voltage power supply control systems within the operation optimization group share parameters and operation data with each other, and monitor each other to see if there are any abnormalities in the operation of the high-voltage electric field; When an abnormal power drop occurs in a high-voltage electric field within a single operation optimization group, the remaining high-voltage power supply control systems within the operation optimization group increase the output power of the controlled high-voltage electric field according to the priority to ensure that the total power target of the operation optimization group remains unchanged; The priority is determined according to the distance between the high-voltage electric field in the operation optimization group and the smoke inlet, and the high-voltage electric field closest to the smoke inlet has the highest priority; When the actual output power of the queried first-priority high-voltage electric field has a power loss anomaly, the second-priority high-voltage electric field is queried according to priority until the power difference is compensated.

2. The electrostatic precipitator operation optimization method according to claim 1, characterized in that: The high-voltage power supply control system is a ring network topology structure communication connection.

3. The electrostatic precipitator operation optimization method according to claim 1, characterized in that: The monitoring module of the high-voltage power supply control system monitors the operating conditions of the high-voltage electric field and the high-voltage power supply in real time, and compares the rated operating condition parameters set by the power supply control module of the high-voltage power supply control system. If the operating condition parameters of the monitoring module do not match the rated operating condition parameters of the power supply control module, the operation of the high-voltage electric field becomes abnormal.

4. The electrostatic precipitator operation optimization method according to claim 1, characterized in that: The high voltage power supply control system comprises: Communication module for receiving real-time data from data acquisition system and sharing control parameters and operation data of the same optimization group. Monitoring module for collecting real-time operating data of high-voltage power supply and high-voltage electric field. A power control module for controlling the power output of the high-voltage power supply to the high-voltage electric field, A distribution module for allocating high voltage power supply control priorities within the same operation optimization group, A power compensation module is used to compensate for operating power loss when other high-voltage electric fields in the same operation optimization group have insufficient operating power.

5. The electrostatic precipitator operation optimization method according to claim 3, characterized in that: The data collected by the monitoring module include the input voltage, input current, bus voltage, high-voltage electric field secondary voltage, high-voltage electric field secondary current, dust collection area of ​​the high-voltage electric field anode plate, type of high-voltage electric field discharge electrode, and total length of the high-voltage electric field discharge electrode.

6. The electrostatic precipitator operation optimization method according to claim 3, characterized in that: The parameters set by the power control module include the secondary voltage rated value, secondary current rated value, secondary voltage setting value, secondary current setting value, and operating frequency setting value of the high voltage electric field.

7. The electrostatic precipitator operation optimization method according to claim 4, characterized in that: The power compensation module is used to compensate for the abnormal power output difference caused by the abnormal output power of other high-voltage electric fields in the same operation optimization system.

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