Question
Describe the functioning of electrostatic precipitator along with a schematic diagram.
✓
Answer
Electrostatic precipitator:
- It is the most widely used method for removal of particulate matter, about 90% of particulate matter is removed from the exhaust of thermal power plants.
- It has electrode wires and a stage of collecting plates.
- The electrode wires are maintained at several thousand volts, which produce a corona that releases electrons.
- These electrons get attached to the (dust) particles and give them a net negative charge within a very small fraction of a second.
- The collecting plates are grounded and hence attract the charged particles.
- The velocity of air between the plates must be low enough to allow the particles to fall on them.
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