CN-121972297-A - Self-adaptive switching device for power supply of high-voltage dust removal plate

CN121972297ACN 121972297 ACN121972297 ACN 121972297ACN-121972297-A

Abstract

The invention discloses a self-adaptive switching device for supplying power to a high-voltage dust collecting plate, which comprises a voltage regulating executing component, a dust concentration collecting component, a physical isolating switch component and a control module, wherein the voltage regulating executing component comprises a first rectifying circuit, an inverter circuit, a high-frequency step-up transformer and a second rectifying circuit which are electrically connected in sequence to form an electric energy conversion link from power frequency alternating current to high-voltage direct current, the physical isolating switch component comprises a high-voltage isolating switch and a status indicator lamp, the physical isolating switch component and the voltage regulating executing component are connected in series in a power supply loop of the high-voltage dust collecting plate, the control module of a built-in concentration-voltage mapping algorithm receives a dust concentration signal of the dust concentration collecting unit, and the control module outputs a corresponding PWM control instruction to the inverter circuit according to the dust concentration to adjust the duty ratio so as to change the power supply voltage of the dust collecting plate. The self-adaptive switching device for the power supply of the high-voltage dust removal plate has the beneficial effects of self-adaptive working condition of the voltage of the dust removal plate and high response speed.

Inventors

SONG CHANGYONG
BAI FAN
Deng Hongshuang
LIU GUOYU
ZHANG HAN
YANG DEZHI

Assignees

华能鹤岗发电有限公司

Dates

Publication Date: 20260505
Application Date: 20260112

Claims (10)

1. The self-adaptive switching device for supplying power to the high-voltage dust removing plate is characterized by comprising a voltage regulating executing assembly, a dust concentration collecting assembly, a physical isolating switch assembly and a control module; the voltage regulation execution assembly comprises a first rectifying circuit, an inverter circuit, a high-frequency step-up transformer and a second rectifying circuit which are electrically connected in sequence to form an electric energy conversion link from power frequency alternating current to high voltage direct current; the physical isolating switch assembly comprises a high-voltage isolating switch and a status indicator lamp, wherein the status indicator lamp is used for indicating the gear of the high-voltage isolating switch; the physical isolating switch assembly and the voltage regulating executing assembly are connected in series in a power supply loop of the high-voltage dust removing plate; the control module is internally provided with a concentration-voltage mapping algorithm, receives a smoke concentration signal of the dust concentration acquisition unit, outputs a corresponding PWM control instruction to the inverter circuit according to the smoke concentration, and adjusts the duty ratio to change the power supply voltage of the dust removal plate.
2. The adaptive switching device for high voltage dust collector board power supply of claim 1, further comprising a current collection assembly for collecting dust collector board power supply loop current and feeding it back to the control module, wherein the control module triggers an alarm when the power supply loop current exceeds a prescribed threshold.
3. The adaptive switching device for high voltage dust collector of claim 2, wherein said control module obtains the rate of change of current to the dust collector ; When the change rate of the load current is positive and exceeds the threshold value, the control module reduces the PWM duty ratio output to the inverter circuit and reduces the power supply voltage; when the change rate of the load current is negative and exceeds the threshold value, the control module increases the PWM duty ratio output to the inverter circuit and increases the power supply voltage.
4. The adaptive switching device for power supply of a high voltage dust removing plate according to any one of claims 1 to 3, wherein the concentration-voltage mapping algorithm presets a plurality of smoke concentration thresholds, each smoke concentration threshold corresponds to a reference power supply voltage, and the control module outputs a PWM control command to enable the power supply voltages to match the corresponding reference voltages according to a threshold interval in which the smoke concentration signal is located.
5. The adaptive switching device for supplying power to a high-voltage dust removing plate according to claim 4, wherein the inverter circuit is formed by an IGBT switch tube into a full-bridge inverter topology, and PWM control command frequency output by the control module is 10-20kHz.
6. The self-adaptive switching device for supplying power to a high-voltage dust removing plate according to any one of claims 1 to 3 and 5, wherein the high-voltage direct-current voltage output by the voltage regulating executing component ranges from 0 kV to 72kV.
7. The adaptive switching device for supplying power to a high-voltage dust removing plate according to claim 6, wherein the dust concentration collecting assembly comprises a laser scattering sensor, and the dust concentration collecting assembly is disposed in front of the high-voltage dust removing plate.
8. The adaptive switching device for supplying power to a high voltage dust removing board according to claim 7, wherein the physical isolating switch assembly further comprises an arc suppressing unit, the arc suppressing unit is an RC absorption circuit or a zinc oxide arrester, and is used for suppressing high voltage arc generated during switching on and off of the switch.
9. The adaptive switching device for supplying power to a high-voltage dust removing plate according to claim 8, further comprising a communication module, wherein the control module is connected with the upper computer through the communication module, and the communication module is used for realizing data interaction between the control module and the upper computer.
10. The adaptive switching device for power supply of a high voltage dust removing board according to claim 9, wherein the communication mode of the communication module is any one of bluetooth, WIFI, 4G, 5G, zigBee, loRa, NB-loT.

Description

Self-adaptive switching device for power supply of high-voltage dust removal plate Technical Field The invention relates to the technical field of environmental protection equipment, in particular to a self-adaptive switching device for power supply of a high-voltage dust removal plate. Background In the electric dust removal field of power plant, the polar plate power supply of traditional electrostatic precipitator has the problem that voltage regulation and control ability is not enough for a long time, is difficult to adapt to complicated changeable operating mode. On one hand, the early power supply device mostly adopts a fixed voltage output mode, the electrode plate voltage is kept constant for a long time after being preset, and the fluctuation of the smoke and dust concentration caused by the fluctuation of the boiler load and the quality change of the fire coal cannot be responded. For example, the concentration of dust is suddenly increased when the boiler is in full-load operation, the electric field strength at a fixed voltage is insufficient to enable a large amount of dust to be fully charged and adsorbed, the dust is easy to escape, and the fixed high voltage can cause serious energy consumption waste under the working condition of low load and low dust. On the other hand, although some improved devices support voltage regulation, most of the devices are controlled by single electric field independently and manually, and have no linkage coordination mechanism. When the smoke concentration is changed, the voltage set value is manually adjusted, so that the labor intensity is high, the problem of adjustment hysteresis exists, and the condition that the turbidity of the discharged smoke exceeds the standard is often caused. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides the self-adaptive switching device for the power supply of the high-voltage dust removing plate, which has the advantages of self-adaptive working condition of the voltage of the dust removing plate and high response speed. The technical scheme of the invention is as follows: the self-adaptive switching device for supplying power to the high-voltage dust removing plate comprises a voltage regulating executing assembly, a dust concentration collecting assembly, a physical isolating switch assembly and a control module; the voltage regulation execution assembly comprises a first rectifying circuit, an inverter circuit, a high-frequency step-up transformer and a second rectifying circuit which are electrically connected in sequence to form an electric energy conversion link from power frequency alternating current to high voltage direct current; the physical isolating switch assembly comprises a high-voltage isolating switch and a status indicator lamp, wherein the status indicator lamp is used for indicating the gear of the high-voltage isolating switch; the physical isolating switch assembly and the voltage regulating executing assembly are connected in series in a power supply loop of the high-voltage dust removing plate; the control module is internally provided with a concentration-voltage mapping algorithm, receives a smoke concentration signal of the dust concentration acquisition unit, outputs a corresponding PWM control instruction to the inverter circuit according to the smoke concentration, and adjusts the duty ratio to change the power supply voltage of the dust removal plate. Preferably, the dust removing device further comprises a current collection assembly, wherein the current collection assembly is used for collecting the current of the power supply loop of the dust removing plate and feeding the current back to the control module, and when the current of the power supply loop exceeds a specified threshold value, the control module triggers an alarm. In any of the above schemes, preferably, the control module obtains the current change rate of the dust removing plate; When the change rate of the load current is positive and exceeds the threshold value, the control module reduces the PWM duty ratio output to the inverter circuit and reduces the power supply voltage; when the change rate of the load current is negative and exceeds the threshold value, the control module increases the PWM duty ratio output to the inverter circuit and increases the power supply voltage. In any of the above schemes, preferably, the concentration-voltage mapping algorithm presets a plurality of smoke concentration thresholds, each smoke concentration threshold corresponds to a reference power supply voltage, and the control module outputs a PWM control command to enable the power supply voltage to match with the corresponding reference voltage according to a threshold interval in which the smoke concentration signal is located. In any of the above schemes, preferably, the inverter circuit is formed by an IGBT switching tube into a full-bridge inverter topology, and the PWM control comman