生物质三组分燃烧特性及动力学分析

采用热重分析法对纤维素、木聚糖和木质素的燃烧特性及动力学进行研究,考察了不同升温速率(20、40、60、80℃/min)对燃烧特性的影响,求出了生物质三组分的燃烧特性参数和动力学参数。研究表明:纤维素和木质素的燃烧失重分别集中在挥发分和焦炭的燃烧阶段,而木聚糖的燃烧在这2个阶段失重都比较大。纤维素和木质素在低温段和高温段燃烧的最佳反应级数分别为1和2,而木聚糖在这2个温度区间燃烧的最佳反应级数都为1。

Combustion characteristics and dynamic analysis ofthree biomass components

Thermogravimetric analysis(TGA) was used to investigate the combustion characteristics and kinetics of cellulose,xylan and lignin.The influences of different heating rates(20,40,60,80℃/min) on their combustion behavior were analyzed.The combustion characteristic parameters and the kinetic parameters were determined.The results show that:The weight loss of cellulose and lignin combustion is concentrated in the burning process of the volatile matter and coke respectively,but that of xylan combustion is large in these two processes.It is observed that the optimum reaction order of cellulose and lignin is one in the low temperature region and two in the high temperature region,while that of xylan is one in two temperature regions.