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A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by...

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Mechanical Engineering

A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8)and 15% butene (C4H8) by volume. It is to be fed to the combustionchamber in 10% excess air at 25ºC, where it is completely burnt tocarbon dioxide and water. The flue gases produced are to be used togenerate 5 bar steam from water at 90ºC. With the aid of the dataat the end of the question, steam tables and the enthalpy tablegiven in the Appendix of lesson HTC - 4 - 2:

(CV) per m3 of the fuel/air mix i have 108.135 MJ/m3

(CV) per kmol of the fuel/air mix i have 2456.51 MJ/Kmol

on a wet basis i have CO2 - 11.07%, N2 - 73.68%, O2 - 1.78%, H2O- 13.48%

on a dry basis. CO2 - 12.79%, N2 - 85.15%, O2 - 2.06%

(f) Determine the ‘furnace efficiency’ if the flue gasesleave the boiler at300ºC.

Data: Net calorific value (MJ/m3 ) at 25ºC of:

Butane (C4H10) = 111.7 MJ/m3

Butene (C4H8) = 105.2 MJ/m3

Propane (C3H8) = 85.8 MJ/m3

Air is 21% oxygen, 79% nitrogen by volume and 23.3% oxygen and76.7% nitrogen by mass.

Atomic mass of C = 12, O = 16, N=14 and H = 1.

Please write as clearly as possible so i can read what is put ortyped would be even better. Please go through the answer asthoroughly as you can too. Please only provide and answerfor furnace efficiency.

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