Regarding the calculation of fuel calorific value
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This post was last edited by asolos2010 on 2018-10-30 09:02. I encountered a small problem while self-studying the calorific value of fuels, and I would like some guidance regarding it: When looking for formulas to calculate the calorific value of fuels, I found online the formula QL=81C+246H+26(S-O)-6W; by applying this formula to methane, the result obtained was 36561 KJ/Nm3； By searching online for the low calorific value of methane, which is 35,880 KJ/Nm3, the results show little variation. Then, the calculation is carried out using bond energy: using the reaction CH4 + 2O2 → CO2 + 2H2O, with bond energies of 4*415 + 2*498 → 2*728 + 4*465; the result is an exothermic release of 660 KJ/mol, which converts to 29464 KJ/Nm3. So, where did the mistake lie? Toluene was also included, and the bond energy calculated for it turned out to be low as well.
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