摘要
为充分利用我国北方农村地区丰富的生物质资源,针对现今农村生物质锅炉氮氧化物排放浓度高的问题,设计一种新型炉膛结构的生物质锅炉以及尿素喷淋脱氮系统,并进行生物质燃烧试验。试验通过改变风道中球阀开度的大小来调节过量空气系数以及一、二次风量的比例,并测量相同重量的生物质颗粒燃料在不同燃烧工况下的氮氧化物排放浓度。试验结果数据分析表明,随着过量空气系数α的增加,氮氧化物折算排放浓度先降低后增加,在α=1.1时达到最小值;增大一、二次风量的比值会导致炉膛内燃烧温度先升高后降低,综合锅炉燃烧效率,在一、二次风量比为6∶4时为最佳燃烧工况,此时氮氧化物排放折算浓度为141.74 mg/m^(3)。对比燃煤锅炉,此生物质锅炉的硫氧化物排放浓度很低,并且新型结构的生物质锅炉添加尿素溶液后氮氧化物排放量明显减少,具有良好的环境效益。
In order to fully utilize the abundant biomass resources in the rural areas of northern China,a biomass boiler with a new furnace structure and a urea spray denitrification system were designed to solve the problem of high nitrogen oxide emission concentration in the rural biomass boilers.And biomass combustion experiments were carried out.The experiment adjusted the excess air coefficient and the proportion of primary and secondary air by changing the opening of ball valve in the air duct,and measured the NO_(X) emission concentration of biomass particulate fuel with the same weight under different combustion conditions.The experimental results showed that with increase in excess air coefficient α,the converted NO_(X) emission concentration first decreased and then increased,reaching the minimum value when α=1.1.Additionally,increasing the ratio of primary and secondary air lead to the combustion temperature in the furnace first increasing and then decreasing.Considering the combustion efficiency of the boiler comprehensively,when the air volume ratio was 6∶4,the converted NO_(X) emission concentration was optimal,and the converted concentration of nitrogen oxide emission was 141.74 mg/m^(3).Compared with coal-fired boiler,the SO_(X) emission concentration of the biomass boiler was very low,and the nitrogen oxide emission of the biomass boiler with new structure was significantly reduced after adding urea solution,which showed good environmental benefits.
作者
张兴惠
翟雨轩
张聪
李曌
张宏
Zhang Xinghui;Zhai Yuxuan;Zhang Cong;Li Zhao;Zhang Hong(School of Civil Engineering,Taiyuan University of Technology,Taiyuan,030024,China)
出处
《中国农机化学报》
北大核心
2022年第5期115-120,共6页
Journal of Chinese Agricultural Mechanization
基金
山西省重点研发计划项目(201803D31035、201903D321043)。
关键词
生物质颗粒
炉膛结构
燃烧
氮氧化物
环境效益
biomass pellet
furnace structure
combustion
nitrogen oxides
environmental benefit
