生物质热解后氮元素迁移的试验研究  

Experiment Investigated on N Migration of Biomass Pyrolysis

作　　者：陈吟颖[1,2] 阎维平[3] 王淑娟[1] 

机构地区：[1]清华大学热能系,北京100084 [2]内蒙古电力工程技术研究院,内蒙古呼和浩特010020 [3]华北电力大学能源与动力工程学院,河北保定071003

出　　处：《锅炉技术》2010年第5期75-78,共4页Boiler Technology

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.

关 键 词：生物质 热解 N迁移 升温速率 

分 类 号：X705[环境科学与工程—环境工程]