Design of Biomass Stove Based on Variable Pressure Jet Combustion Technology

Biomass stoves are environmentally friendly stoves that provide heat through biomass eombustion, which have a long history and extensive foundation in China. It has the advantages of high efficiency, environmental protection, high thermal efficiency, low smoke and dust emission, etc. It is widely used in domestic hot water, building heating and industrial heating and other fields. In the combustion process, however, due to technical limitations, it is difficult to ensure the full combustion of biomass fuels, and problems such as low boiler thermal efficiency and environmental pollution have become constraints on the development of biomass stoves in China. To solve this problem, a biomass molding combustion stove was proposed based on variable pressure jet combustion technology. During the combustion process, the primary air and secondary air formed by the two air intake mechanisms of the stove were in the furnace body in the form of spin, integral rotation or superposition of the two, changing the air volume ratio and air intake position of the secondary air and the inflation angle. As a result, different air pressure jets were formed in the stove to strengthen the heat and mass transfer, ensure the burnout effect, and effectively control the generation and emission of nitrogen oxides during the combustion process. The fuel combustion test results showed that the combustion thermal efficiency of corn stover was 85. 97%, the bottom ash slagging rate was 3. 42%, and the biomass particles were fully burned; the SO2emission was 18. 34 mg/m3, the NOxemission measurement was 91. 45 mg/m3, and the CO volume fraction was 0. 092% . The pollutant discharge met the national standard. The boiler had good stability and met the design requirements. © 2022 Chinese Society of Agricultural Machinery. All rights reserved.