Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?
Correct answer: C. Increase in calorific value of the fuel
- A. Reduction in scale losses
- B. Increase in flame temperature
- C. Increase in calorific value of the fuel
- D. Saving in fuel consumption
Explanation
Preheated air raises flame temperature, reduces scale formation and saves fuel by improving heat transfer and combustion. It cannot increase the fuel’s calorific value, which is an intrinsic property of the fuel.
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