For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?
Correct answer: B. Decrease
- A. Increase
- B. Decrease
- C. Increase or decrease depending on the fuel type
- D. Not change
Explanation
Increasing the air/fuel ratio adds excess nitrogen and oxygen that must be heated, so more heat is carried by the combustion gases and the adiabatic flame temperature falls. This is why excess air improves completeness of combustion but lowers flame temperature.
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