High sulphur content in a fuel ______________ of the flue gases?
Correct answer: D. Both B. and C.
- A. Decreases the dew point
- B. Increases the dew point
- C. Reduces the combustion efficiency by limiting the permissible temperature reduction
- D. Both B. and C.
Explanation
Sulphur burns mainly to sulphur dioxide, which can oxidise further to sulphur trioxide and form sulphuric acid vapour. This raises the acid dew point and prevents cooling the flue gas too far, reducing recoverable efficiency.
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