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How does an electrostatic precipitator work?

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An electrostatic precipitator is a device which is used to extract the suspended dust particles from the gas.

Working of an electrostatic precipitator is as follows:

 

  • High voltage charge is used to collect particles on the charged plates. Electrode wires, maintained at high voltages, produce a corona that releases electrons.
  • These electrons attach to dust particles and give them a net negative charge.
  • Grounded collecting plates attract negatively charged dust particles. Thus, dust particles are removed from the air. A spray of water or lime is generated in the scrubber and exhaust is passed through this spray. Scrubber removes gases, like Sulphur dioxide from the air. Thus, polluting gases like Sulphur dioxide are removed from the air.
  • Electrostatic precipitator can remove over 99% particulate matter present in the exhaust from a thermal power plant.
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