Which of the following would require maximum amount of % excess air for complete combustion ?
Correct answer: B. Lump coal (fixed on chain grate)
- A. Coke oven gas
- B. Lump coal (fixed on chain grate)
- C. Pulverised coal
- D. Furnace oil
Explanation
Lump coal on a chain grate has the poorest contact between fuel and air, so it needs the greatest excess-air supply for complete combustion. Coke oven gas and liquid fuel mix more readily with combustion air.
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