The 'electrostatic precipitator' (ESP) works on the principle of:
Choose the correct answer
Filtration through cloth bags (like fabric filter)
Corona discharge ionises particles; electric field attracts them to grounded collection plates
Centrifugal separation (like cyclone)
Water scrubbing
Correct Answer
B. Corona discharge ionises particles; electric field attracts them to grounded collection plates
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ESP: particles passing between high-voltage electrodes (discharge electrode at −30 to −60 kV DC, collecting plate grounded). Corona discharge ionizes air → ions attach to particles → charged particles attracted to collecting plates. Plates rapped (vibrated) → dust falls to hopper. Efficiency > 99% for particles > 1 μm. Used for: coal power plants (fly ash), cement kilns, steel plants. High capital cost, low operating cost.
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