不同农业生物质废弃物的热解特性及动力学对比  

Comparative Study on Pyrolysis Characteristics and Dynamics Characteristics of Different Agriculture Biomass Wastes

作　　者：姚锡文[1] 许开立[1] 闫放[1] 何钟琦[2] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《东北大学学报（自然科学版）》2016年第11期1593-1597,共5页Journal of Northeastern University(Natural Science)

基　　金：农业部农村能源综合建设项目(2015-36);辽宁省自然科学基金资助项目(2013020137)

摘　　要：为了充分利用农业生物质废弃物进行热解气化,以玉米芯、花生壳、稻壳和稻秸为研究对象,以髙纯氮气为载气,通过热重分析和质谱分析联用技术,考察了其热解过程的失重机制、热流变化规律、小分子可燃气体（C O , H2 和CH4 ） 的释放规律及综合热解特性.结果表明,生物质的热解失重主要发生在220-410 t ,玉米芯在该区间的失重最髙,占总失重的8 0% - 9 0 % ;挥发分综合释放指数D ：玉米芯 〉 稻秸 〉 稻壳〉 花生壳,活化能：稻壳 〉 玉米芯 〉 稻秸 〉 花生壳,固体剩余物：稻壳 〉 花生壳 〉 稻秸 〉 玉米芯,总体上看,玉米芯和稻秸的热稳定性较差,而稻壳和花生壳的热稳定性较好;通过Coats - Redfern法计算得到了相应的活化能和频率因子,计算结果与热重试验基本-致.For efficiently utilizing the agricultural biomass wastes through pyrolysis and gasification, thermogravimetric and mass spectrometry experimentation of corn cob, peanut shell, rice husk and rice straw were performed by thermogravimetric analysis and mass spectrometry. Mechanism of weightlessness, regularities of heat flow and the releasing combustible and small moleacule and small moleacule gases (CO, H2and CH4) as well as the pyrolysis characteristics were thoroughly studied. The results showed that the weight loss of biomass mainly occurs within 220~410. As for corn cob, the weightlessness between 220 and 410 is the highest, which accounts for 80%~90% of the total weight loss. The pyrolysis index D is corn cob > rice straw > rice husk > peanut shell. The activation energy is rice husk > corn cob > rice straw > peanut shell. The char yield is rice husk > peanut shell > rice straw > corn cob. Generally, thermal stabilities of corn cob and rice straw are poor while thermal stabilities of rice husk and peanut shell are relatively stable. The activation energy and frequency factor are obtained by Coasts-Redfern method. Numerical results show a good consistency with thermogravimetric data. © 2016, Editorial Department of Journal of Northeastern University. All right reserved.

关 键 词：生物质 热解 热重分析 质谱 动力学 

分 类 号：TK6[动力工程及工程热物理—生物能]