auxiliary fuels such as charcoal used in catering industry belong to the category of biomass energy. According to the fuel classification, biomass energy refers to energy from plants, animals or other organic substances, which usually includes solid fuels (such as wood and charcoal), liquid fuels (such as biodiesel and bioethanol) and gaseous fuels (such as biogas and biogas). Charcoal fuel commonly used in catering industry is generally obtained by heating wood and other plant organic matter, which has the advantages of high combustion efficiency, large calorific value and less exhaust gas emission, and is a common form of biomass energy.