辐射松和稻壳及其三组分热重动力学

摘要

利用热天平对两种植物生物质(辐射松和稻壳)及其三组分半纤维素、纤维素和木质素分别在不同的升温速率下进行热重分析，调查这些样品随热解温度的失重情况以及热解动力学。随着升温速率的增加，半纤维素的DTG曲线表现出不同于其他实验样品的规律，即DTG曲线的峰值向低温区移动。使用Kissinger微分法、FWO法和Popescu法联合对热解数据进行分析，分别计算反应活化能E和指前因子A，以及最可几机理函数，其中Jander方程G(α)=13α)(1-]2为纤维素、辐射松和稻壳的最可几机理函数，反Jander方程12)3G(α)=[(1+α-1]为半纤维素和木质素的最-[1可几机理函数，可以较好地解决植物生物质及其三组分的动力学参数的求算。%Different pyrolysis characteristics of wood biomass(radiata pine and rice husk)and their three biomass compo-nens(hemicellulose,cellulose and lignin)at different heating rates were studied with TG. The DTG curves of the hemicellu-lose was different from other samples,and they moved towards the low temperature region with the increase of heating rate. Three methods,Kissinger,FWO and Popescu,were used to determine the kinetics. Based on the characteristics of different methods,the pre-exponential factor,activation energies and most probable mechanism functions of the five samples were detemined. The most probable mechanical functions of cellulose,pinups radiate and rice husk were Jander equation:1 32G(α)=[1-(1-α)],while others were anti Jander equation:1 23G(α)=[(1+α)-1]. The kinetic paramenters of the five sam-ples could be solved well by using the three methods in combination.