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Chapter 3 Working hypotheses and preliminary analysis The methane combustion reaction in air can be written as follows: CH4 +2(O2 +3.76N2)CO2 +2H2O+7.52N2 (3.1) This means that burning 1 m3 of methane requires 2 · (1 + 3.76) = 9.52 m3 of air. Bearing in mind that the chemical elements molecular weights (MW) in the reactants, expressed in kg/kmol, are: H – 1, C – 12, N – 14 and O – 16, stoichiometric mass air to fuel ratio, αst, can be then easily calculated as follows: αst,CH4 = 2 MWair = 2 (2⋅16+3.76⋅2⋅14) kga/kmol = 17.16 kga (3.2) MWCH4 12+4⋅1 kgf /kmol kgf On the other hand, in Section 2.3 it has already been explained that SI engines normally operate in lean conditions. In this regard, Figure 3.15 shows real air/fuel ratio values for commercial models9. 40 35 30 25 20 Internal combustion engines (natural gas) - Air to fuel ratio (α) 15 100 1000 Power output [kWel] 10000 Figure 3.15 – Air to fuel ratio in methane-fed SI internal combustion engines. 9 Data are taken from [TF] and several technical catalogues. 110 Air to fuel ratio (α)PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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