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What is minimum amount of air required per m^3 of gaseous fuel for complete combustion?(a) 1/21 [(H2/2) + (CO/2) + 2CH4 + 3C2H4] m^3/m^3 of fuel(b) 1/100 [(H2/2) + (CO/2) + 2CH4 + 3C2H4] m^3/m^3 of fuel(c) 1/21 [(H2/2) + (CO/2) + 3C2H4] m^3/m^3 of fuel(d) 1/100 [(H2/2) + (CO/2) + 3C2H4] m^3/m^3 of fuelThis question was addressed to me in homework.I would like to ask this question from Calorific Value of Fuels topic in chapter Steam Power Plant of Energy Engineering

Answer»

The correct OPTION is (a) 1/21 [(H2/2) + (CO/2) + 2CH4 + 3C2H4] m^3/m^3 of FUEL

Easiest EXPLANATION: Volumetric analysis of fuels hydrogen, carbon monoxide, methane, ethane, carbon dioxide and nitrogen is done and required minimum AMOUNT of oxygen is found for one m^3 of GASEOUS fuel:

O2 required/m^3 of fuel = 1/100[(H2/2) + (CO/2) + 2CH4 + 3C2H4] m^3

As atmospheric air contains 21% of O2 by volume, minimum air required t burn one m^3 of gaseous fuel is given by,

Minimum volume of air required (cm^3/m^3 of fuel):

= 1/100 [(H2/2) + (CO/2) + 2CH4 + 3C2H4] 100/21

= 1/21 [(H2/2) + (CO/2) + 2CH4 + 3C2H4] m^3/m^3 of fuel.


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