Three-phase current transformer rectifier sets - High-voltage power supplies for difficult conditions in electrostatic precipitators

摘要

Stack gases, which are generated by coal-fired power plants, waste-to-energy, and biomass combustion plants as well as exhaust gases from steel- and cement factories have a substantial adverse effect on the environment and according to legislation, they have to be purified before they are released into the ambient air. Solid particles, such as fly ash are captured by a filter system through which the exhaust gas stream is flowing. Given the varying compositions of exhaust gases and the solid particles they are transporting, the reliable separation of dusts is frequently a technical challenge; hence the choice of the most compatible filter system and its voltage supply as well as its concise alignment with the respective situation are extremely important. Fundamentally, a distinction is made between two filter principles: fabric filters that retain dust particles by mechanical means and electrostatic precipitators (ESP), which use a strong electrostatic field to divert the dust particles to separation panels where they are deposited. The paper at hand describes the power sources' and operating modes that work well under difficult ESP conditions.