烟梗结构特征及其热解特性研究
Study on structural and thermal decomposition characteristics of tobacco stem
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摘要: 以河南产烟梗为研究对象，通过化学成分分析、红外光谱分析和结晶度分析对其进行结构表征，利用热重分析法研究烟梗的热解特性，并计算其热解动力学参数.结果表明：烟梗中纤维素、半纤维素、木质素和果胶质量分数分别为28.15%、20.01%、5.67%和5.32%，含有典型的生物质成分；烟梗具有木质纤维素特征结构基团；烟梗中纤维素的结晶度为25.37%，更易发生热解反应；烟梗热解过程中，纤维素、半纤维素和木质素的热解失重率分别为18.83%、17.89%和15.06%，对应的热解反应活化能分别为31.72 kJ/mol、27.82 kJ/mol和58.99 kJ/mol，其中纤维素和半纤维素热解过程符合一级化学反应，木质素热解过程符合三级化学反应.Abstract: The structure of tobacco stems from He'nan province was characterized by chemical composition analysis,infrared spectrum analysis and crystallinity analysis.The thermal decomposition characteristics of tobacco stems were studied by thermogravimetric analysis,and the pyrolysis kinetic parameters were also calculated.Results showed that there were typical biomass components in tobacco stems,and the contents of cellulose,hemicellulose,lignin and pectin were 28.15%,20.01%,5.67% and 5.32%,respectively.There were characteristic structural groups of lignocellulose in tobacco stem.The crystallinity of tobacco stem was 25.37%,which indicated that the pyrolysis reaction of tobacco stem was easier to be carried out.During the pyrolysis of tobacco stems,the weight loss of cellulose,hemicellulose and lignin were 18.83%,17.89% and 15.06%,respectively.Corresponding activation energies of pyrolysis reactionswere 31.72 kJ/mol,27.82 kJ/mol and 58.99 kJ/mol,respectively.The pyrolysis of cellulose and hemicellulose were dominated by a first-order chemical reaction,while lignin pyrolysis was controlled by a third-order chemical reaction.
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