... weeds, pine needle, leaf, crops straw, cattle and sheep dung. HYBB-1 biomass gasifierstraw gasifier technology principle:In ... leaf, crops straw, cattle and sheep dung, mushroom residue) the percent of the carbon element is about forty percent, followed ... , nitrogen, oxygen, magnesium, silicon, phosphorus, potassium, calcium element. the organic composition in the plant straw is mainly hemicellulose ...