In order to enhance the adaptability of electrostatic precipitator(ESP) to wide load range condition of circulating fluidized bed(CFB) boiler

an experimental research about the ESP operating power and emission control was carried out in a 135 MW CFB boiler

and the relationship between the particulate matters emission concentration and ESP operating power was obtained. The results indicate that

due to the variation in unit load

the flue gas temperature changed

which directly affected operating power of the ESP

so dust removal effect of the ESP is very sensitive to the boiler load change. With the flue gas temperature ranging from 100 ℃ to 200℃

the operating power of the ESP would increase by about 100 k W and the dust specific resistance would reduce by about 1 magnitude when the flow gas temperature reduces by about 20 ℃. Decreasing the flue gas temperature plays an important role in keeping the ESP operating stably with a high efficiency.