Open Access
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 |
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