生物质加压热重分析研究  

Pressurized Thermogravimetric Analysis of Pyrolysis of Biomass

作　　者：肖军[1] 沈来宏[1] 王泽明[1] 仲晓黎[1] 

机构地区：[1]东南大学洁净煤发电及燃烧技术教育部重点实验室,南京210096

出　　处：《燃烧科学与技术》2005年第5期415-420,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金(50306002);国家自然科学基金重大资助项目(20590367);国家重点基础研究发展规划(973)资助项目(2003CB214500).

摘　　要：对两种生物质木屑和松针进行了不同压力和升温速率下的热重分析试验,通过生物质热重失重率(TG)和失重速率(DTG)曲线,获得了相关热解特性参数,提出了生物质的挥发分综合释放特性指数D.并通过热分析数学方法求取了生物质热解动力学参数.试验结果表明,氮气气氛中,木屑与松针常压和增压下主要热解阶段可认为两段一级反应;热解压力的提高,将延迟生物质挥发分初析温度和DTG峰值温度,降低最大析出率和DTG峰值,生物质的挥发分综合释放特性指数D也减小,增加了生物质挥发分的析出难度,并改变了热解反应活化能和频率因子.同一压力下,提高热解升温速率,生物质综合特性指数D将增加.The pressurized thermogravimetric analysis of two biomass samples （ sawdust and pine needle） in N2 was performed under different pressures and heating rates. The pyrolysis characteristics were obtained using TG and DTG curves. A pyrolysis index, D, was put forward to describe the biomass pyrolysis characteristics. And kinetic parameters of biomass were also calculated by thermal analysis mathematic method. The results show that the pyrolysis process of biomass can be dealt with as the first order reaction model in two stages for both sawdust and pine needle. With pyrolysis pressure increasing, the conversion and the peak in DTG decrease, but the initial temperature of biomass pyrolysis rises. This also results in the pyrolysis index, D, decreases. In addition, the activation energy and frequency factor of both biomass samples vary with different pressures. Under the same pressure, the pyrolysis index D can greatly rise with increasing heating rate.

关 键 词：生物质 加压 热解 热重分析 

分 类 号：TK6[动力工程及工程热物理—生物能]