Discussion
Arrange the consequences of cooling flue gas in a wet scrubber:
1. Gas temperature falls sharply as the gas is washed
2. The gas falls below its acid dew point
3. Sulphuric acid condenses on the stack lining
4. Reheat or an acid-resistant lining becomes necessary
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4
The sequence is causal: the wet scrubber cools the gas sharply → it falls below the acid dew point → sulphuric acid condenses on the lining → reheat or an acid-resistant lining becomes necessary. Each step follows from the one before, and the last is the design response to the first three.
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