Improvement and Engineering Application on Pulse Power Supply of Electrostatic Precipitator in Coal-Fired Power Plant

doi:10.12096/j.2096-4528.pgt.23065

Abstract

Abstract:

Objectives High voltage power supply is the core equipment of electrostatic precipitator (ESP). Pulse power supply can achieve efficient removal of high specific resistance dust, but there are problems such as high pulse voltage causing heating and electromagnetic interference, which affect the stability of operation. Therefore, based on the conventional pulse power supply, an improved pulse power supply is designed. Methods The upgraded supporting technologies of pulse power supply, including dual-path pulse transformer, full-film oil-immersed capacitors, heat dissipation system combined with air-oil-natural forced cooling, anti-interference system, and pulse width adaptive algorithm, are proposed. The pulse power supply is tested on two ESPs on side A and side B of one furnace of 660 MW coal-fired unit. The first four electric fields on A-side use high-frequency power supply, while the fifth electric field uses an improved pulse power supply. As a comparison, all five electric fields on B-side use high-frequency power supply. Results The performance indicators reach a pulse peak voltage of 100 kV, a pulse peak current of 350 A, and a pulse repetition rate of 1-400 Hz, and the improved improved performance comparison test results show that the dust concentration at the outlet of the ESP is below 5 mg/m³, and the high voltage power consumption of the ESP decreases by 24.5% after the addition of improved pulse power supply and control system. Conclusions The improved pulse power supply increases parameters such as secondary voltage, solves problems such as heating and electromagnetic interference, and improves the efficiency of electrostatic precipitator, which is of great significance for improving the efficiency of high specific resistance dust capture.

Key words: coal-fired boiler, electrostatic precipitator (ESP), pulse power supply, pulse width adaptive algorithm, ultra-low emission, power consumption, electromagnetic interference, dust control

CLC Number:

TK 01

Haibao ZHAO, Yuzhong HE, Hanxiao LIU, Jiang LIANG. Improvement and Engineering Application on Pulse Power Supply of Electrostatic Precipitator in Coal-Fired Power Plant[J]. Power Generation Technology, 2025, 46(1): 154-160.

Figures/Tables 14

Fig. 1 Schematic diagram of dual pulse transformer

Fig. 2 Assembly diagram of full film oil immersed capacitor

Fig. 3 Simulation of heat dissipation system

Fig. 4 Disturbed waveform of primary current

Fig. 5 Schematic diagram of ground connection

Fig. 6 Waveform excluding interference

Fig. 7 Waveform comparison of secondary current

Fig. 8 Waveform comparison of secondary voltage

Fig. 9 3D model of pulse power supply

Fig. 10 Temperature test results of key parts

Tab. 1 Test results of temperature and temperature rise

部件	温度/℃	温升/℃
IGBT器件	53.6	≤30
变压器油温	35.5	≤12
储能电容	48.7	≤25
控制器	46.7	≤25

Fig. 11 Photos of improved pulse power supply

Fig. 12 Electrostatic precipitator of a 660 MW unit in Xinjiang

Tab. 2 Comparison of main indicators

项目	改进前	改进后	对比
采用的主要技术	高频电源、低低温电除尘、多场气流技术	改进脉冲电源及控制系统、低低温电除尘、多场气流技术	—
除尘效率/%	99.91	99.91	同一水平
出口粉尘质量浓度/(mg/m³)	<5	<5	同一水平
1台ESP 20 d电耗/(kW·h)	109 370	82 568	降低24.5%

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