【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.更多还原

【Abstract】 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.Modeling of the pyrolysis of the three biomass species assuming hemicellulose,cellulose and lignin pyrolyzing independently and parallelly obeying first order reaction mechanism was accomplished 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 lignin 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 lignocellulosic biomass.更多还原