The main drawback of supplying more excess air in the combustion of fuel is the_________________?
Correct answer: B. Enhanced sensible heat loss in the flue gas
- A. Excessive power requirement of air blower
- B. Enhanced sensible heat loss in the flue gas
- C. Intermittent and uncontrolled combustion of the fuel
- D. High exit flue gas temperature from the furnace
Explanation
Excess air increases the amount of nitrogen and unused oxygen carried through the furnace, so more hot flue gas must be heated and discharged. This raises sensible heat loss and lowers combustion efficiency.
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