非传统动力学分析法解析生物质热解过程  

NEW KINETIC ANALYISIS METHOD TO STUDY BIOMASS PYROLYSIS PROCESS

作　　者：胡松[1] 孙路石[1] 向军[1] 张军营[1] 李培生[2] 付鹏[1] 杨涛[1] 陈巧巧[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074 [2]武汉大学动力与机械学院,武汉430072

出　　处：《太阳能学报》2008年第8期1038-1044,共7页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展规划项目(2006Cb200304-03);德国政府鸿堡基金

摘　　要：将一种新方法引入到生物质热解过程的分析中,该方法利用不同升温速率下的热重实验数据,基于合理的假设和非线性最小二乘法,确定出生物质热解过程中的反应分布,并最终计算得到对应的活化能、指前因子以及反应比率。在本研究中,首先将其用以计算模拟DTG数据,所得结果与预设数值非常吻合。同时,对纤维素热重实验数据进行分析,发现对于符合一级反应机理的脱挥发分过程,可以很好地计算各反应相关参数。最终将该方法应用到生物质热解过程研究中,结果表明不同生物质的热解过程是由具有不同特征的众多一级反应所组成。不同生物质单元反应的活化能、指前因子以及所对应的反应比率可分为3个部分。各部分的动力学参数以及分布状态与生物质的种类相关。A new method was introduced for determining the kinetics of biomass pyrolysis. The thermogravimetric experiments date at several different heating rates, but constant for each, were used to identify and characterize the reaction distribution in the biomass pyrolysis process. The logical hypothesis and non-linear square fitting were used to calculate integrate equation to get the values of activation energy of every individual reaction. Then, pre-exponent factor and mass fraction of every individual reaction could be evaluated. At first, this method was tested on imaginary data from simulated DTG experiments with three first-order reactions. Then, pyrolysis process of cellulose was studied by this method. The two tests prove that this method is satisfied to analyze the devolatilisation process which obeys first-order mechanism. At last, real data from thermogravimetric experiments about the biomass pyrolysis were analyzed. It is shown that biomass devolatilisation process is composed by several individual steps. Different biomasses have varied numbers and characteris- tics of individual steps. Values of the activation energy and pre-exponential factor for each individual step can be determined.

关 键 词：生物质 热解 动力学 非线性最小二乘法 热分解 

分 类 号：TK6[动力工程及工程热物理—生物能]