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The portion of flue gases carried away to produce draught could be utilized to _______

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The portion of flue gases carried away to produce draught could be utilized to _______

(a) Heat the air entering furnace

(b) Blow out the combustion products such as soot and ash

(c) Heat the fuel in ash chamber

(d) Support the combustion

The question was asked in an internship interview.

Question is taken from Draught System topic in chapter Steam Generators & Accessories of Energy Engineering

1 Answer

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Right answer is (a) Heat the air entering furnace

To elaborate: It is evident that the draught is created at the cost of thermal efficiency of boiler plant installation since a portion of flue gases carried away by the flue gases to produce the required draught could have been used either in heating the air entering the furnace or in heating the feed water, which would increase the thermal efficiency.

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