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Which of the following is calculated by flue gas analysis?

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Which of the following is calculated by flue gas analysis?

(a) Amount of air used in combustion

(b) Rate of combustion

(c) Time required for combustion

(d) Amount of air present after combustion

The question was posed to me in examination.

My query is from Efficiency of Combustion in division Fuels and Combustion of Engineering Chemistry II

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The correct answer is (a) Amount of air used in combustion

Best explanation: The only practical way for determining the amount of air used in furnace is to analyse the flue gas for the constituents CO2, CO an O2. The control of air is by means of dampers.

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