Biomass gas is a combustible gas produced by the pyrolysis or gasification of biomass at high temperatures, using materials containing biomass such as crop straw, forest waste, edible mushroom residue, livestock manure, and sewage sludge as raw materials. Biomass gas contains 15.27% hydrogen, 3.12% oxygen, 56.22% nitrogen, 1.57% methane, 9.76% carbon monoxide, 13.75% carbon dioxide, 0.10% ethylene, 0.13% ethane, 0.03% propane, and 0.05% propylene.