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Environmental System

Wet Electrostatic Precipitator

System Description

ACTIVE Wet Electrostatic Precipitators (WEP) are designed to meet the needs of the most demanding applications. Particle collection occurs in an electric field. This minimizes energy costs compared to scrubbers and baghouses which require large amounts of energy to overcome the resistance to air flow. Wet Electrostatic Precipitators may also be designed with an optional scrubber section for removal of acid gases. This makes this unit the most versatile air pollution control system on the market.

Wet operation offers several advantages to the operation of an electrostatic precipitator:

• Gas absorption can take place.
• The water tends to provide a continuous cleaning action.
• Water acts as a quenching medium to cool the inlet gas to its adiabatic
   saturation temperature, eliminating the need for a heat exchanger.
• With re-entrainment eliminated, performance levels can be very high

Principles of Operation

Stack gases containing particles or acid mist to be removed, flow upward through an electrically grounded tube (collector cell). A concentric discharge electrode is maintained at a high negative DC electric potential. Particles or acid mist passing through the intense electromagnetic filed (corona) are charged negatively and are attracted to the grounded collector cell. Collector surfaces are kept wet and ash resistivity minimized by using water sprays. Particles reaching the collector walls are captured and drain down into a sump for removal.