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The molecular weight for the gas mixture is calculated below for a 100 lb mol basis: 100 lb mol basis 1 lb mol lb mols MW (lb/lb mol) Weight (lb) MW (lb/lb mol) Fuel Constituent mol percent CH4 4.0 4.0 CO 0.4 0.4 CO2 17.6 17.6 H2 75.0 75.0 H2O 3.0 3.0 T otal 100.0 100.0 16.04 28.01 44.01 2.016 18.02 64.16 11.20 774.58 151.20 55.06 1056.2 10.56 b) The higher heating value of the fuel gas can be reasonably predicted from the composition. The following table presents the higher heating value for common fuel gas constituents: Table 9-1 HHV Contribution of Common Gas Constituents Higher Heating Value Gas Btu/lb Btu/ft3 H2 CO CH4 C2H6 C3H8 C4H10 H2O, CO2, N2, O2 Reference (12) HHV (Btu/ft3) at 1 atm and 60 oF. 60,991 325 4,323 321 23,896 1014 22,282 1789 22,282 2573 21,441 3392 0 0 Using these HHV contributions, the gas composition, and the ideal gas law, calculate the overall HHV on a basis of 100 ft3 in the following table: 100 ft3 Basis Fuel mol Volume HHV Heat Input Constituents percent (ft3) (Btu/ft3) (Btu) 1 ft3 Basis HHV (Btu/ft3) 285.6 CH4 4.0 4.0 CO 0.4 0.4 CO2 17.6 17.6 H2 75.0 75.0 H2O 3.0 3.0 T otal 100.0 100.0 1014 4056 321 128 0 0 325 24,375 0 0 28,559 9-23PDF Image | Fuel Cell Handbook (Seventh Edition)
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