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The amount of CO2 formed in overfeed system entirely depends on ___________

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The amount of CO2 formed in overfeed system entirely depends on ___________

(a) Amount of ash produced

(b) Carbon content in fuel

(c) Rate of air supply

(d) Intensity of process

This question was addressed to me during an interview.

The doubt is from Principle of Stoker topic in chapter Steam Power Plant of Energy Engineering

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Correct choice is (c) Rate of air supply

The best I can explain: The rate of carbon-dioxide entirely depends on the rate of air supply. When the hot air after cooling the ash passes to incandescent coke bed, here the O2 reacts with C to form CO2.  Generally for fuel bed of 800mm depth all the O2 in the air is consumed in the incandescent region.

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