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Heat of combustion of methane
 |
(13) |
| CH4 (g) + 2O2 (g) = CO2 (g) + 2H2O (l) |
(14) |
Heat of combustion = (Heat of formation of products) − (Heat of formation of reactants)
By substituting the values of heats of formation, one obtains heat of combustion equals
 . 14 respectively.
Similarly, combustion equations for  and  can be written and heat of combustion value can be calculated.
Heat of combustion of  and of  kcal/kgmol when reference state of POC is vapour. Thus net calorific value of natural gas is
|NCV| = 0.94 ×194.91 × 103 + 0.03 × 350.56 × 103 + 0.005 × 498.18 ×103
= 8.76 × 103 kcal/m3 (1 atm and 273K)
References:
(1) R. Schuhmann: Metallurgical Engineering, Vol.1 Engineering Principles
(2) O.P.Gupta: elements of fuels, furnaces and Refractories, Khanna Publishers
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