Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?
Correct answer: C. Calorific value of the fuel
- A. Speed of combustion of fuel
- B. Flame temperature achieved
- C. Calorific value of the fuel
- D. Heat transfer rate to the stock in the furnace
Explanation
Preheating combustion air raises flame temperature, accelerates combustion and improves heat transfer, but it cannot alter the chemical calorific value of the fuel. The fuel releases the same heat per unit amount when completely burned.
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