51.
Write a note on working of electrostatic precipitator.
An electrostatic precipitator has electrode wires and a stage of collecting plates and scrubber. The electrode wires are maintained at several thousand volts, which produce a corona that releases electrons. These electrons attach to dust particles and give them a net negative charge within a very small fraction of a second. The collecting plates are grounded and attract the charged dust particles. The velocity of air between the plates is low enough and allows the dust to fall. The scrubber removes gases like sulphur dioxide by passing the the exhaust through a spray of water or lime.
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