3种生物质的裂解特性及动力学建模  

Pyrolysis characteristics and kinetic modeling of three biomass species

作　　者：王君[1] 张明旭[2] 陈明强[1] 闵凡飞[2] 王新运[1] 邵群[1] 张学才[1] 张素平[3] 任铮伟[3] 颜涌捷[3] 

机构地区：[1]安徽理工大学化学工程系,安徽淮南232001 [2]安徽理工大学材料科学与工程系,安徽淮南232001 [3]华东理工大学能源化工系,上海200237

出　　处：《煤炭学报》2007年第2期194-197,共4页Journal of China Coal Society

基　　金：国家重大基础研究前期研究专项基金资助项目(2004CCA07300);国家自然科学基金资助项目(20676002);安徽省优秀青年科技基金资助项目(04044059)

摘　　要：在流动氮气气氛和不同的加热速率下对马尾松、棉杆和杉木进行了热分析实验.裂解温度与灰分进行关联表明,生物质中的内在矿物质对裂解有催化作用.采用非线性最小平方的算法按三组分独立平行一级反应建立了裂解动力学模型,求解的动力学参数与文献报道值吻合,且发现随着加热速率的增加,纤维素和木质素的裂解活化能增大,其对失重的贡献率呈减小的趋势,半纤维素裂解活化能减小,其对失重的贡献率呈增大的趋势.根据木质纤维素类生物质的主要结构成分特性分析了形成这种变化趋势的潜在原因.Thermal analysis of pine wood, cotton＂ stalk and fir wood sawdust was carried out under various heating rates and dynamic nitrogen atmosphere. The correlation between pyrolysis temperature and ash in the biomass indicates that the inherent minerals in the biomass can catalyze the pyrolysis. Modehng of the pyrolysis of the three biomass species assuming hemicellulose, cellulose and lignin pyrolyzing independently and parallelly obeying first order reaction mechanism was accomphshed employing the nonlinear least squares algorithm. The calculated kinetic parameters are in agreement with those reported. In addition, it was found that, as heating rate increases, activation energy values of cellulose and hgnin increases and their contribution to weight loss tends to fall, whereas those of hemicellulose decreases and its contribution to weight loss tends to rise. The underlying Cause of this changing trend was analyzed in terms of the properties of the main components of the hgnocellulosic biomass.

关 键 词：生物质 裂解 动力学 

分 类 号：TQ352[化学工程]