小龙潭褐煤的高温气化反应动力学研究  

Study on Gasification Kinetic of Xiaolongtan Lignite at High Temperature

作　　者：魏蕊娣[1] 任立伟[1] WEI Ruidi;REN Liwei(Hebei Key Laboratory of Heterocyclic Compounds,Handan University,Hebei Handan 056005,China)

机构地区：[1]邯郸学院河北省杂环化合物重点实验室,河北邯郸056005

出　　处：《广州化工》2024年第19期48-50,96,共4页GuangZhou Chemical Industry

基　　金：河北省“三三三人才工程”资助项目(No:A202102018);国家自然科学基金项目(No:21706047);邯郸市科学技术研究与发展计划项目(No:23422404145zc)。

摘　　要：以小龙潭褐煤为研究对象,在下落式固定床中对其二氧化碳高温气化反应性进行了研究。在1000~1500℃温度范围内,测定了小龙潭褐煤气化碳转化率与时间的关系。采用缩核芯模型、均相体积模型和表观动力学模型,对气化实验数据进行了拟合,得到了煤样二氧化碳高温气化反应的速率常数、活化能和指前因子等动力学参数。从三种模型的拟合结果可以看出:三种模型均能有效拟合褐煤的高温气化过程,相关系数都在0.96以上;相比之下,缩核芯模型的拟合效果最好,表观动力学模型次之,表明缩核芯模型的模型假设更接近褐煤高温气化反应过程,即褐煤高温气化反应以气体扩散控制为主,反应主要在煤样/半焦外表面进行;由三种模型拟合计算所得褐煤的表观活化能分别为45.6 kJ/mol、45.8 kJ/mol、47.1 kJ/mol,缩核芯模型和表观动力学模型拟合所得活化能非常接近,印证了模型拟合结果具有较高的可信度。The gasification kinetic characteristics of a lignite were simulated by using Shrink core model(SCM),Volume reaction model(VRM)and Apparent kinetic model(AKM)at temperatures of 1000~1500℃.The differences of kinetic parameters obtained by the three different models were compared and analyzed.It can be seen from the fitting results of the three models,the SCM model had the best fitting effect,followed by the AKM model and the VRM model.This result indicated that high-temperature gasification process of the lignite was obviously controlled by gas diffusion.The apparent activation energy of the lignite calculated by the three models were 45.6,45.8 and 47.1 kJ·mol-1,respectively.The difference was small and the credibility was high.

关 键 词：褐煤 高温气化 气化反应性 动力学模型 

分 类 号：TQ530.2[化学工程—煤化学工程]