Discussion
Statement I: Fabric filters must be kept above the acid dew point of the gas.
Statement II: Condensation blinds the fabric with a paste that cleaning cannot remove.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both are true and the second gives the consequence. If the gas falls below its acid dew point, sulphuric acid condenses within the cake and turns it into a paste that cleaning cannot dislodge - the bags are blinded, the pressure drop climbs and they must be replaced. The remedy is to keep the whole filter, including the hopper and casing, above the dew point by insulation and by heating during start-up and shutdown.
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