CN-122006902-A - Dynamic collaborative flashover control method and system for electric dust remover

CN122006902ACN 122006902 ACN122006902 ACN 122006902ACN-122006902-A

Abstract

The invention relates to a dynamic collaborative flashover control method and system for an electric precipitator, and belongs to the technical field of electric precipitator power supply control. The method comprises the steps of collecting dust concentration at an inlet and an outlet of an electric dust collector and secondary voltage and secondary current data of each electric field in the electric dust collector, setting flashover frequency values of head and tail electric fields according to comparison results of dust concentration values and preset mapping curves, calculating flashover frequency set values of electric fields in all stages in the electric dust collector by using gradient coefficients, controlling high-voltage power supply closing duration according to a charge release time constant of a dust layer when flashover occurs in a single electric field, then recovering to flashover critical voltage through a two-stage boosting process, and dynamically reducing flashover electric field voltage according to flashover voltage and real-time frequency and correspondingly improving normal electric field voltage when flashover occurs in a plurality of electric fields.

Inventors

LI XIN
MAO CHUNHUA
HUANG YAOLONG
PAN XINGZHEN
CHEN YING
CHEN WENBIN
MA QINLIANG
HUANG JUCAI
WANG HONGMING
WU CHAOCHENG
BU FANWEI
DONG QINGWU
WU ZHENLIANG

Assignees

华电邹县发电有限公司
福建龙净环保股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251223

Claims (9)

1. The dynamic collaborative flashover control method for the electric dust remover is characterized by comprising the following steps of: collecting dust content at an inlet and an outlet of an electric dust collector in real time, and collecting secondary current and secondary voltage of each electric field; The method comprises the steps of setting a gradient flashover frequency set value for each electric field according to dust content at an inlet and the arrangement sequence of each electric field along the airflow direction, detecting a dust content change value at the inlet in real time, and self-adaptively adjusting the flashover frequency set value of each electric field based on a preset dust-frequency response curve when the change value is not zero; The method comprises the steps of monitoring whether spark flashover occurs in electric fields or not in real time according to secondary current and secondary voltage of each electric field, obtaining corresponding real-time flashover frequency and flashover voltage values, executing a flashover response control strategy to adjust voltage control spark flashover frequency if spark flashover occurs in a single electric field, and dynamically distributing working voltage of each electric field to control spark flashover frequency according to the real-time flashover frequency, flashover voltage values and dust content at an outlet of each electric field if spark flashover occurs in a plurality of electric fields by utilizing a dynamic optimization strategy based on fuzzy control.
2. The method of claim 1, wherein the method sets a graded flashover frequency set value for each electric field, specifically, the flashover frequency set value of the first electric field is highest along the air flow direction in the electric precipitator, and the flashover frequency set value of each electric field is gradually decreased along the air flow direction according to a preset decreasing amplitude.
3. The method for controlling dynamic collaborative flashover of an electric precipitator according to claim 1, wherein the flashover response control strategy is specifically: when the spark flashover of a single electric field is monitored, the output of a high-voltage power supply of the electric field is immediately closed, the charge release time constant of a dust layer in the electric field is used as the restarting time of the high-voltage power supply of the electric field, when the closing duration time of the high-voltage power supply reaches the restarting time, the output of the high-voltage power supply is opened, the high-voltage power supply of the electric field is controlled to be rapidly boosted to a preset intermediate voltage value, and after the voltage is boosted to the intermediate voltage value, the high-voltage power supply of the electric field is controlled to be slowly boosted to the flashover critical voltage of the electric field.
4. A method for controlling dynamic collaborative flashover of an electric precipitator according to claim 3, characterized in that the step of calculating the preset intermediate voltage value comprises: when the real-time flashover frequency of the single electric field is smaller than the flashover frequency set value, the intermediate voltage value is expressed as the following formula: ; In the formula, Which represents the value of the intermediate voltage, As a result of the empirical coefficient, Representing a flashover point voltage value; When the real-time flashover frequency of the single electric field is larger than or equal to the flashover frequency set value, the intermediate voltage value is expressed as the following formula: ; In the formula, Representing the frequency of the real-time flashover, Indicating the flashover frequency set point.
5. The method of claim 4, further comprising calculating a slow boost rate, wherein when executing the flashover response control strategy, the high voltage power source of the electric field is controlled to slowly boost to a flashover threshold voltage of the electric field according to the slow boost rate, specifically: when the real-time flashover frequency of the single electric field is smaller than the flashover frequency set value, the boosting rate is expressed as follows by a formula: ; In the formula, The rate of boost is indicated as being the rate of boost, Representing the rate of boost coefficient of the power-up, Representing the boost rate set point; when the real-time flashover frequency of the single electric field is greater than or equal to the flashover frequency set value, the boosting rate is expressed as the following formula: ; In the formula, Representing the frequency of the real-time flashover, Indicating the flashover frequency set point.
6. The method for controlling spark flashover by dynamic cooperation of electric dust collector according to claim 1, wherein said dynamically distributing the working voltage of each electric field to control the spark flashover frequency by utilizing a dynamic optimization strategy based on fuzzy control, specifically, adjusting the working voltage of each electric field, comprises: aiming at an electric field with real-time flashover frequency reaching or exceeding a flashover frequency set value, the working voltage of the electric field is gradually reduced according to the flashover point voltage of the electric field, and the reduction amplitude of the working voltage is positively correlated with the excess degree of the flashover frequency of the electric field exceeding a preset flashover frequency set value, and the electric field flashover frequency is expressed as follows in a formula: ; In the formula, Indicating the magnitude of the decrease in the operating voltage, Representing the frequency of the real-time flashover, Indicating the set point for the flashover frequency, Representing a flashover point voltage value; While reducing the working voltage of the electric field, gradually increasing the working voltage of the electric field with the real-time flashover frequency not reaching or exceeding the flashover frequency set value, wherein the voltage boosting amplitude is expressed as the following formula: ; In the formula, The voltage step-up amplitude is indicated, Representing the compensation coefficient of the compensation coefficient, Indicating the working voltage of the electric field before the boost amplitude is not increased; After the working voltage of each electric field is adjusted, the dust content at the outlet of the electric dust collector is continuously monitored, and the compensation coefficient is corrected according to the change trend of the dust content at the outlet.
7. A dynamic collaborative flashover control system of an electric precipitator, comprising: the collecting module is used for collecting dust content at the inlet and the outlet of the electric dust collector in real time and secondary current and secondary voltage of each electric field; The parameter setting and adjusting module is used for respectively setting graded flashover frequency set values for the electric fields according to the dust content at the inlet and the arrangement sequence of the electric fields along the airflow direction, detecting the dust content change value at the inlet in real time, and self-adaptively adjusting the flashover frequency set values of the electric fields based on a preset dust-frequency response curve when the change value is not zero; The flashover frequency control module is used for monitoring whether the electric fields are in spark flashover or not in real time according to secondary current and secondary voltage of each electric field, acquiring corresponding real-time flashover frequency and flashover voltage values, executing a flashover response control strategy to adjust voltage to control the spark flashover frequency if the electric fields are in spark flashover, and dynamically distributing working voltage of each electric field to control the spark flashover frequency according to the real-time flashover frequency, the flashover voltage values of each electric field and dust content at an outlet if the electric fields are in spark flashover according to a plurality of electric fields.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 6 when the program is executed by the processor.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1 to 6.

Description

Dynamic collaborative flashover control method and system for electric dust remover Technical Field The invention relates to a dynamic collaborative flashover control method and system for an electric precipitator, and belongs to the technical field of electric precipitator power supply control. Background As one of the core technologies of industrial flue gas purification, the electric dust remover can efficiently remove dust, smoke and micron-sized particles generated in the industrial production process, and has irreplaceable importance in modern industrial systems. The working principle of the electric dust collector is that a high-voltage power supply for dust collection applies direct-current high voltage between a discharge electrode and a dust collection electrode to excite corona discharge with negative polarity, so that dense ions are generated. When the dust-containing flue gas passes through the electric field, the dust particle charge is separated from the air flow under the action of the electric field, migrates to the dust collecting electrode, deposits on the dust collecting electrode, and finally removes dust on the dust collecting electrode by physical methods such as vibration and the like; in the operation process, when the electric field strength reaches a critical point, the gas between the cathode and anode plates is broken down, and instant spark flashover can be generated. The discharge phenomenon is accompanied by obvious detonating sound, visible electric spark and voltage and current dip, so that not only is the dust removal efficiency affected, but also the equipment safety is possibly threatened. And the complicated and changeable actual working conditions lead to spark flashover in an electric field to be difficult to avoid. Frequent spark flashovers can significantly reduce dust removal efficiency, affecting the reliability of the power supply system. Meanwhile, if the flashover frequency is set too low, the electric field strength may be reduced in order to control the flashover phenomenon, which is disadvantageous for dust collection. For example, the Chinese patent application with publication number CN107727978A discloses a spark flashover detection method and a spark flashover detection system for an electric field of an electric dust collector, which comprises the steps of collecting feedback signals of secondary voltage and secondary current of the electric field in the electric dust collector, setting a plurality of time parameters to perform specific operation on the feedback signals to obtain a plurality of smooth movement average lines of the feedback signals, forming a smooth movement average line group by the plurality of smooth movement average lines, judging a spark flashover signal based on the intersection relation of the smooth movement average lines in the smooth movement average line group, and generating a spark flashover energy level. The patent focuses on the detection and energy level analysis of spark flashover, obtains a smooth movement average line family through calculation of a feedback signal, judges according to an intersecting relation, but needs to calculate a plurality of smooth movement average lines at the same time, has high requirements on real-time sampling frequency and MCU computing capacity, judges the energy level according to the number of homogeneous intersection points, and can be misjudged as single large flashover when dense small-amplitude sparks occur. For example, the Chinese patent application with publication number CN106391314A discloses a spark tracking control method of an electrostatic precipitator, which comprises the steps of predicting possible fault voltage of a current electric field through analysis of near flashover fault voltage and generalized regression neural network, improving a three-wire method based on the possible fault voltage, designing a more reasonable fault starting voltage value setting strategy and a voltage lifting rate calculating method, focusing on spark tracking control, improving a voltage recovery strategy through fault voltage, lifting electric field average voltage, deleting old data simply by a data updating mechanism, ignoring trend change in gradual change of working conditions, and needing historical flashover voltage data initialization when GRNN is used again, and predicting failure under cold start or low spark rate working conditions. In order to meet the frequent peak regulation requirement of the power grid, the coal-fired boiler often needs to greatly adjust the load operation in a short time, so that the dust concentration at the inlet of the electric dust collector fluctuates severely. However, the existing flashover control method is mostly regulated and controlled based on the working condition before flashover occurs and the frequency control preset value, so that the condition that the inlet dust concentration suddenly changes is difficult to effectively cope with. Theref