Editorial Department of Power Generation Technology
Doi
Abstract
ObjectivesHigh 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.MethodsThe 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.ResultsThe 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.ConclusionsThe 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
