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采用化学方法测量纤维素生物质稻秆、棉秆及松木屑的纤维素及木质素含量,利用Malek法逻辑选择得到较合理的最概然机理函数G(α)或f(α),并通过热重法分析纤维素含量对热解特性的影响规律.结果表明:纤维素含量越高,热解速率越大;木质素含量越高,热解速率越小;随着样品升温速率的提高,热解曲线向低温区偏移,热解速度加快;样品粒径越小,颗粒间的空隙越小,传质传递的阻力增大,失重速率降低,最大反应速率降低;利用Malek法推断最概然机理函数十分有效,通过分析得到稻秆热解过程应分为两个阶段分别建立动力学模型,前段采用D1模型,后段采用F1模型.
The cellulose and lignin content of cellulose biomass rice straw, cotton stalk and pine sawdust were measured by chemical method. The most probable mechanism function G (α) or f (α) was obtained by Malek’s method. The results showed that the higher the cellulose content was, the higher the pyrolysis rate was. The higher the lignin content, the smaller the pyrolysis rate was. With the increase of the heating rate, The pyrolysis curve shifts to the low temperature region and the pyrolysis rate is accelerated. The smaller the particle size of the sample, the smaller the interspace between the particles, the larger the resistance of mass transfer, the lower the weight loss rate and the lower the maximum reaction rate. However, the mechanism function is very effective. Through the analysis, the pyrolysis process of rice stems should be divided into two stages to establish the dynamic model respectively. The former uses D1 model and the latter adopts F1 model.