【摘要】 生物质是可转化为可替代常规化石燃料和其他化学品的可再生碳资源。为了更充分的利用木质资源，本文采用TAQ500热重分析仪研究槐木粉体热解行为。采用FWO法探讨活化能分布，dollimore的形状和特征值推断最概然，机理函数法确定热解动力学模型。结果表明：干燥槐木粉体在氮气氛围下热解：在650K时炭得率26.48%；在室温到800℃整个过程都在失重；半纤维素的热解在450K-590K，纤维素的热解在590K-650K；大于650K，主要是木质素热解，木质素的热解产物绝大部分为焦炭。活化能随转化率的增加呈现曲线分布，证明木材中主要成分热解活化能及遵循的机理不同。DTG曲线形状证明半纤维素热解属于化学反应控制、纤维素热解阶段属于扩散或边界反应为控制步骤。机理函数法拟合获得，在475K-590K阶段，半纤维素热解，F₁活化能213.68 kJ·mol^-1；在590K-630K，纤维素和半纤维素同时热解，D₂活化能是261.34 kJ·mol^-1。结合双分子碰撞理论和Arrhenius活化能意义，证明槐树粉体在480K-640K整个热解过程可以用机理函数F₂解释，热解动力学方程为dα/dt=1.160*10⁹e^-21672/T（1-α）²。更多还原

【Abstract】 Biomass is the only renewable carbon resource that can be converted into alternative to conventional fossil fuels and other chemicals. In order to make full use of wood resources, the pyrolysis behavior of Robinia powder was studied by using TAQ500 thermogravimetric analyzer. FWO method was used to investigate the activation energy distribution, Dollimore shape and characteristic values were deduced to be the most probable, and mechanism function method was used to determine the pyrolysis kinetics model. The results showed that the char yield of dried black locellia wood powder was 26.48% at 650K in nitrogen atmosphere. The whole process was in weight loss from room temperature to 800℃. The pyrolysis of hemicellulose happened in 450K-590K, and that of cellulose was 590K-650K. When it was larger than 650K, it is mainly lignin pyrolysis, and most of the pyrolysis products are coke. The activation energy showed a curvilinear distribution with the increase of conversion, which indicated that the activation energy and mechanism of pyrolysis of main components in wood were different. The shape of DTG curve proved that hemicellulose pyrolysis was controlled by chemical reaction and the pyrolysis stage of cellulose was controlled by diffusion or boundary reaction. By fitting mechanism function method, hemicellulose was pyrolyzed in 475K-590K, and F₁ activation energy was 213.68 kJ·mol^-1. In 590K-630K, cellulose and hemicellulose were simultaneously pyrolyzed, and D₂ activation energy was 261.34 kJ·mol^-1. Combined with the bilimolecar collision theory and activation energy, it was proved that the whole pyrolysis process of Robinia powder in 480K-640K could be explained by the mechanism function F₂, and the pyrolysis kinetics equation was dα/dt=1.160*10⁹e^-21672/T（1-α）².更多还原