摘要
利用热重分析仪(TGA)对华北地区常见的农业、林业废弃物等生物质及其混合物进行热解试验,研究秸秆、玉米芯、沙柳枝和叶、紫花苜蓿等11种生物质及其混合物热解后的半焦产率,分析了不同升温速率下生物质混合物的挥发分与半焦中N的分配比。研究结果显示:农作物废弃物中的N在热解过程中至少有50%残留在半焦中;生物质的叶、大多数林业废弃物和草本类生物质热解过程中残留在半焦中的N低于33%,其余随挥发分析出。生物质混合物在热解过程中,大量的N随挥发分析出,随着升温速率的提高,迁移到气态中的N含量降低。试验结果可为生物质发电减排NOx提供参考依据。
11 kinds of biomass and the biomass mixture were investigated, such as straw, saw dust, branch and leaves of salix psammophia, alfalfa etc. Product distribution of pyrolytic char and N ratio of gas/char of bomass and the biomass mixture pyrolysis were analyzed, N migration characteristic were investigated on different heating rates of the biomass mixture. The result shows： N component of pyrolytic char is more than 50% about agriculture residues, N yield of pyrolytic char is less than 33% to biomass leaves of most of forest residues and herbaceous biomass. During biomass mixture pyrolysis, a mass of N precipitate with volatile, and N yield of gas decrease when different pyrolysis heating rates incresing. Experiment results are also a reference for reducing NOx emission of biomass power plants.
出处
《锅炉技术》
北大核心
2010年第5期75-78,共4页
Boiler Technology
关键词
生物质
热解
N迁移
升温速率
biomass
pyrolysis
N Migration
different heating rates
