Discussion
A plant must remove submicrometre particulate from a hot gas near its acid dew point.
Which device is least suitable?
Answer: D
Correct answer: A fabric filter, which would blind
A gas near its acid dew point is the one condition a fabric filter cannot tolerate: condensation within the cake produces a paste that no cleaning cycle will remove, and the bags are lost. A precipitator manages, a venturi scrubber is entirely at home with wet and near-saturated gas, and a cyclone is indifferent to it - though useless alone on submicrometre material, which is why the option pairs it with a filter downstream.
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