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A 15kg of air is supplied per kg of fuel burnt to the combustion chamber of a boiler using fuel 600kg/hr. the temperature of flue gases and ambient air are 273°C and 32°C. If the minimum draught required to start the flue is 9.5mm of water, find out the minimum height of the chimney?

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A 15kg of air is supplied per kg of fuel burnt to the combustion chamber of a boiler using fuel 600kg/hr. the temperature of flue gases and ambient air are 273°C and 32°C. If the minimum draught required to start the flue is 9.5mm of water, find out the minimum height of the chimney?

(a) 22.66m

(b) 23.84m

(c) 24.52m

(d) 25.16m

I have been asked this question by my college director while I was bunking the class.

Asked question is from Draught System topic in division Steam Generators & Accessories of Energy Engineering

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The correct answer is (a) 22.66m

The explanation is: Temperature of fuel gases Tg = 237 + 273 = 510K

      Temperature of ambient air Ta = 32 + 273 = 305K

                Drought in mm of water Hw = 9.5mm

                       Mass of air mg = 15kg

We have,

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