Steam is required for the heating, dissolution, processing, black liquor concentration, and press drying of chemicals during pulp production. Therefore, steam boilers are the main driving force of paper mills. They use coal or other fuels to generate high-temperature steam through conversion energy, and deliver steam to various workshops for steaming and drying. The paper industry is one of the major industries that emit pollution and is also a major energy consumer. Under the strict environmental supervision, the frequency of gas furnaces, fluidized beds and biomass boilers is getting higher and higher.