Discussion
Consider the following statements about excess air.
1. Too little gives incomplete combustion and unburned fuel.
2. Too much carries heat out of the stack and lowers efficiency.
3. More excess air always raises the flame temperature.
Answer: D
The first two are correct and between them define the optimum. The third is inverted, since the extra nitrogen and oxygen absorb heat and the flame temperature falls. Around fifteen per cent excess is typical for gas firing.
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