Properties of biogas.
|Composition of biogas (% by volume)||Methane (CH4) = 50–70
Carbon dioxide (CO2) = 25–50
Hydrogen (H2) = 1–5
Nitrogen (N2) = 0.3–3
Water vapour (H2O) = 0.3
Hydrogen sulphide (H2S) in traces
|Research octane number$||130|
|Flammability limit (vol. % in air)*||7.5–11.7|
|Flame speed (m/s)*||21|
|Stoichiometeric air-fuel ratio (kg of air/kg of fuel)#||6.05|
|Density at 1 atm & 288 K (kg/m3)#||0.91|
|Auto-ignition temperature (K)#||1087|
|Calorific value (MJ/kg)#||20.67|
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