Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?
Correct answer: C. Blast furnace gas with air
- A. Furnace oil with air
- B. Furnace oil with oxygen
- C. Blast furnace gas with air
- D. Blast furnace gas with oxygen
Explanation
Blast-furnace gas contains large amounts of inert nitrogen and other diluents, so burning it with air produces a large flue-gas mass and heat loss at 600°C. Oxygen firing greatly reduces this nitrogen load, making option c the maximum-loss case.
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