In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
Correct answer: D. More of excess air
- A. More of CO2 in flue gas
- B. Less of excess air
- C. More of CO in flue gas
- D. More of excess air
Explanation
An oxidising furnace atmosphere requires oxygen in excess of the stoichiometric combustion requirement, so excess air must be increased. Excess carbon monoxide would instead indicate reducing conditions or incomplete combustion.
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