In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?
Correct answer: C. Imperfect mixing of fuel & air and infiltration of air
- A. Use of non-preheated combustion air
- B. Use of pulverised solid fuels
- C. Imperfect mixing of fuel & air and infiltration of air
- D. Use of excessive positive draft in the furnace
Explanation
Complete combustion would require perfect fuel-air mixing and no air leakage, conditions that are not achieved in practical furnaces. Therefore, excess oxygen and less than theoretical CO₂ commonly appear in the flue gas.
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