Discussion
Corrosion in a stack lining is a particular concern when
Answer: C
Correct answer: Flue gas falls below its dew point
Sulphur trioxide in the flue gas combines with water vapour, and below the acid dew point - typically 110 to 140°C for a sulphur-bearing fuel - sulphuric acid condenses on the lining and attacks it. Keeping the gas above that temperature, or lining the stack with an acid-resistant material, is what prevents it.
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