What are the broad and narrow definitions of biomass boiler fuel?

　　Biomass boiler biomass materials are renewable, low pollution, and widely distributed.

　　Broad concept Biomass includes all plants, microorganisms, and animals that feed on plants and microorganisms and their production wastes. Crop waste, wood waste and animal manure are the most representative biomass raw materials.

　　The narrow concept of biomass mainly refers to lignocellulose such as straw and waste materials in the agricultural and forestry production process, except for grain and fruit, leftovers from the agricultural product processing industry, agricultural and forestry waste, and livestock manure and waste in the livestock production process, etc. substance.