Too much of excess air in combustion results in high___________________?
Correct answer: D. All A., B. and C.
- A. Fuel consumption for the same heat load
- B. Stack gas temperature
- C. Percentage of oxygen in flue gases
- D. All A., B. and C.
Explanation
Excess air carries additional nitrogen and oxygen through the furnace, increasing fuel use for a fixed heat load, residual oxygen, and usually stack-gas heat loss and temperature. Therefore, all three listed effects are associated with excessive air.
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