【摘要】 我国长江中下游地区有大面积分布的芒属、芦苇、狼尾草,研究很少,应用少。为草类生物质能的开发与利用提供又一途径。对芒属、芦苇、狼尾草进行常压热重分析,同时与常见的稻草相比较,通过生物质热解失重率(TG)和失重速率(DTG)曲线,获得相关热解特性参数,采用生物质挥发分综合释放指数(D),并通过热分析数学方法求取生物质热解动力学参数。试验结果表明:草类生物质热解过程可以分为4个阶段,在563 K附近存在一个肩峰,失重都集中在460 K~673 K,挥发分综合释放指数则芒属>稻草>狼尾草>芦苇,活化能则芒属>稻草>狼尾草>芦苇,固体剩余物则芒属>狼尾草>稻草>芦苇,所以总体上看芒属的热解稳定性相对较差,芦苇的热解稳定性较好,同时采用二级反应动力学模型由Coats-Redfern法求的相应得活化能和频率因子。也为今后更好、更合理高效的利用这些草类提供实验数。更多还原

【Abstract】 Miscanthus spp,Phragmites australis and Pennisetum of which the distributions are in a large area on the middle and lower reaches of the Yangtze River in China have been rarely studied and have not been fully utilized.In order to the development of biomass utilization and provide another way for a better future.In order to provide experimental data for a more rational and efficient use of these grasses.The article main study the thermogravimetric annlysis for Miscanthus spp,Phragmites australis,Pennisetum,comparing rice straw.The pyrolysis characteristics were obtained using TG and DTG curves.A pyrolysis index,D,was to describe the biomass pyrolysis characteristics.And kinetic parameters of biomass were also calculated by thermal analysis mathematic method.The result show that the pyrolysis process of these samples could be separated into four stages.Biomass have a shoulder volatilization peaks at about 563K.The main weight loss rang is from 460K to 673K.The pyrolysis index D is Miscanthus spp > rice straw > Phragmites australis > Pennisetum.The activation energy is Pennisetum > Miscanthus spp > rice straw > Phragmites australis.The char yield are Miscanthus spp > Pennisetum > rice straw >Phragmites australis.Generally spesking thermal stability of Miscanthus spp is relatively poor,Phragmites australis is relatively stable.The pyrolysis process can be described by second order reaction model,with the method of Coasts-Redfern,the activation energy and frequency factor of different kinds of floristic biomass were attained.更多还原