煤炭地下气化过程中还原区煤焦-CO_(2)气化反应动力学研究  

Study on Gasification Reaction Kinetics of Semi-Coke and CO_(2) in Reduction Zone During Underground Coal Gasification

作　　者：辛林[1,2] 徐伟豪 牛茂斐 杨敏[1] 李华龙 尚振杰 王欣[1] XIN Lin;XU Weihao;NIU Maofei;YANG Min;LI Hualong;SHANG Zhenjie;WANG Xin(College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学安全与环境工程学院,山东青岛266590 [2]山东科技大学矿山灾害预防控制-省部共建国家重点实验室培育基地,山东青岛266590

出　　处：《山东化工》2025年第4期6-11,共6页Shandong Chemical Industry

基　　金：国家自然科学基金(52374211,52304190,52304060);山东省自然科学基金(ZR2023QE117)。

摘　　要：煤炭地下气化可实现煤清洁利用,其产气的关键是发生在还原区中的煤焦与气化剂的反应。为探究煤炭地下气化过程中还原区煤焦与二氧化碳的气化反应动力学特性,采用Mettler TGA 2型热重分析仪研究了不同升温速率对煤焦气化特性的影响。通过分析TG/DTG曲线,确定不同升温速率下的反应特征温度,并选取均相模型、收缩未反应芯模型和随机孔模型进行计算对比,确定最能描述煤焦-CO_(2)气化反应过程的模型。结果表明:最大失重速率点对应的温度随升温速率的增加而增加,同时快速脱挥发分阶段的温度区间有所扩大。均相模型和随机孔模型拟合值较高,并且反应活化能和指前因子呈现出较好的动力学补偿效应,能较好描述其反应过程。低温段的快速脱挥发分阶段拟合程度相对更好,反应活化能更高,整个反应过程中拟合度平均值随升温速率的增加而增加,平均活化能随升温速率的增加而下降。Underground coal gasification can realize the clean utilization of coal.The key to its gas production is the reaction of char and gasification agent in the reduction zone.In order to explore the gasification kinetic characteristics of semi-coke and carbon dioxide in the reduction zone during underground coal gasification,the effects of different heating rates on the gasification characteristics of semi-coke were studied by Mettler TGA 2 thermogravimetric analyzer.By analyzing the TG/DTG curve,the reaction characteristic temperature at different heating rates was determined,and the homogeneous model,the shrinking unreacted core model and the random pore model were selected for calculation and comparison to determine the model that can best describe the char-CO_(2) gasification reaction process.The results show that the temperature corresponding to the maximum weight loss rate point increases with the increase of the heating rate,and the temperature range of the rapid devolatilization stage is expanded.The fitting values of the homogeneous model and the random pore model are higher,and the reaction activation energy and the pre-exponential factor show a better kinetic compensation effect,which can better describe the reaction process.The fitting degree of the rapid devolatilization stage in the low temperature section is relatively better,and the activation energy of the reaction is higher.The average fitting degree increases with the increase of the heating rate during the whole reaction process,and the average activation energy decreases with the increase of the heating rate.

关 键 词：煤炭地下气化 热重分析 反应动力学 升温速率 

分 类 号：TD843[矿业工程—煤矿开采]