Discussion
A flue gas at \( 145 \) degrees is cooled by a wet scrubber to \( 55 \) degrees against an acid dew point of \( 120 \) degrees. The gas is now
Answer: A
Correct answer: Below the dew point; acid will condense
At 55°C the gas is well below its acid dew point of 120°C, so sulphuric acid will condense on the stack lining and corrode it. This is exactly why a wet scrubber is followed either by reheat - raising the gas back above the dew point - or by an acid-resistant lining. Reheat costs fuel but also restores some buoyant plume rise.
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