Abstract:Biomass pellet fuel made from crop straw has the advantages of convenient storage and transportation, high combustion heat efficiency, and can be used to replace coal as the main energy source for cooking and winter heating in rural households. However, the combustion of biomass particles will emit a large amount of nitrogen oxides. Currently, biomass denitrification is mainly used in large industrial furnaces, and there are basically no nitrogen oxide treatment devices in rural household biomass boilers. Based on the combustion characteristics of biomass fuel, the structure and key combustion technologies of a special stove for straw briquette fuel were firstly introduced, and then combustion experiments were conducted on corn straw briquette fuel. KM9106 flue gas analyzer was used to measure NO, NO2 and oxygen content in flue gas during combustion. The results indicated that by changing the air volume ratio, intake position, and inflation angle of the two winds, different air pressure jets were formed within the furnace to strengthen heat and mass transfer, ensure burnout effect, and effectively control the generation and emission of nitrogen oxides during the combustion process. Analysis of experimental data showed that when the ratio of primary to secondary air flow was 3∶1, when distributing secondary air by air pressure jet formed by disturbing flow, the straw shaped fuel had the highest combustion temperature, sufficient combustion, which can meet the requirements of efficient and clean combustion, and had high promotion and utilization value.
