作　　者： ; ; ; (罗海银）; (熊家佳）;

机构地区： 长沙理工大学能源与动力工程学院

出　　处： 《西北大学学报（自然科学版）》 2014年第6期923-929,共7页

摘　　要： 利用热重分析仪与气相色谱/质谱联用仪（TG-GC/MS）对木质素进行了动态升温热裂解研究。利用傅里叶变换红外光谱仪分析木质素微观结构,得到不同升温速率下的热重曲线,研究表明,木质素高温热裂解可以分为3个阶段,分别为干燥失水阶段、挥发分析出阶段和炭化阶段;随着升温速率的增加,各个阶段的最大失重率所对应的温度均向高温侧轻微移动,并且失重程度也随之增加;升温速率对木质素热裂解挥发分析出阶段机理模型的选择没有影响,其热裂解反应机理是一级反应控制机理,木质素热裂解挥发分析出阶段在不同升温速率下的表观活化能为54~63 k J·mol-1;对TG-GC/MS的联用提出了新的见解,设计加装了空气驱动阀,获得了主要热裂解气体产物CO,CO2,CH4和H2在不同温度下的析出规律。 The non-isothermal pyrolysis of （kraft） lignin, in an inert atmosphere, has been studied by thermo-gravimetric analyzer （TGA）-coupled with a gas chromatograph/mass spectrometry analyzer（GC/MS）in this paper. Get the TG and DTG curves at different heating rates based on the typical micro-structure of lignin, which is analyzed by Fourier transform infrared spectroscopy, results show that ： the pyrolysis of lignin at high temperature can be divided into three stages： drying stage, devolatilization stage and carbonization stage, re- spectively. Corresponding temperature of the maximum weight loss rate of each stage moves slightly towards higher temperature with the increase of heating rate, the degree of weight loss also increases. There has no effect on lignin pyrolysis devolatilization stage mechanism model selection, and the pyrolysis mechanism is first-order reaction control mechanism, the lignin pyrolysis devolatilization stage apparent activation energy under different heating rates has been obtained, the numerical value is 54 - 63 kJ · mol^-1. New insights for TG-GC/MS combined use is proposed, air actuated valve designed, obtained the precipitation characteristics of main pyrolysis gas products of CO , CO2, CH4 and H2 at different temperatures

关 键 词： 木质素 热裂解 官能团 动力学 热重 气相色谱 质谱联用仪

领　　域： [动力工程及工程热物理]