Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?
Correct answer: B. Reduce SO2 content in
- A. Catalytically convert SO2 to SO3 in
- B. Reduce SO2 content in
- C. Increase the dew point of
- D. None of these
Explanation
Limestone, mainly calcium carbonate, reacts with sulphur dioxide in the boiler or flue-gas system to form calcium sulphite or sulphate. This captures SO2 and lowers its concentration in the flue gas rather than converting it catalytically to SO3.
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