Table 1

Properties of biogas.

Property Value
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

#For biogas containing 60% CH4 and 40% CO2.

$For biogas containing 57.4% CH4 and 42.1% CO2.

*For biogas containing 73% CH4 and 17.4% CO2.

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