Use of preheated air for combustion of fuel in the furnace, increases the___________________?
Correct answer: C. Flame temperature
- A. Scale losses of the furnace stock
- B. Calorific value of the fuel
- C. Flame temperature
- D. None of these
Explanation
Preheating the combustion air adds sensible heat before burning, so less fuel energy is spent heating cold air. The resulting furnace flame temperature therefore increases, although the fuel calorific value is unchanged.
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