Question

The main purpose of electrostatic precipitators in power plants is:




to remove bottom ash from the flue gas


to remove NOx from the flue gas


to remove SOx from the flue gas


to remove fly ash from the flue gas

Answer 1

to remove fly ash from the flue gas

Electrostatic precipitators charge fine particulate (fly ash) in the flue gas and collect it on plates using electrostatic forces. (NOx and SOx require other controls—SCR/ SNCR for NOx, scrubbers/FGD for SOx; bottom ash is collected from the furnace.)