Wet electrostatic precipitator ( ESP ) particulate control system designs can be either up flow or down flow relative to where polluted air enters the ESP during the particulate control process. Turning vanes and perforated plate evenly distribute the gas flow inside of the wet electrostatic precipitator.
Assuming a down flow design: The gas then enters the wet electrostatic precipitator ( ESP ) deviceís round collection tubes, which are bundled, between two tube sheets in a honeycomb type arrangement. Above the collection tubes are two sets of spray headers. The first spray header continually mists the collection tubes with small water droplets, which are immediately charged and flow down the tube, in the direction of the gas flow. This continually wets the tubes to prevent sticky particulates from adhering to the tubes during the particulate control process. The second spray header is the flushing header, which periodically sprays a larger amount of water to flush the collected precipitate out of the collection tubes into the lower plenum, during the particulate control process.
In the middle of each ESP collection tube is a rigid pin corona-generating electrode. Each electrode suspends from an alignment rack, which is supported by insulators located out of the gas stream. A 65-80 KV transformer rectifier energizes the electrode rack with an automatic controller.
As the dust and aerosol particles enter the collection tubes, located inside of the wet electrostatic precipitator, they become charged from a bombardment of negatively charged electrons. The negatively charged particles adhere to the wetted collection tube and are periodically flushed into the electrostatic precipitatorís lower plenum.
The lower plenum is designed to demist the gas stream and drain all of the collected precipitate to the collection system, completing the particulate control process. All of our electrostatic precipitator ( ESP ) devices as well as our biofilter and biofiltration equipment meet MACT.