庆华烟煤有机显微组分化学链气化反应特性及动力学分析  

Reactive characteristics and kinetic analysis of organic macerals in Qinghua bituminous coal via chemical looping gasification

作　　者：万慧凝 王强 姚奇 陆有朋 吴建波[1] 吴玉花[1] 张慧 白红存[1] WAN Huining;WANG Qiang;YAO Qi;LU Youpeng;WU Jianbo;WU Yuhua;ZHANG Hui;BAI Hongcun(State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学化学化工学院省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021

出　　处：《洁净煤技术》2025年第2期93-102,共10页Clean Coal Technology

基　　金：宁夏自然科学基金优青资助项目(2024AAC05001);国家自然科学基金资助项目(22478206)。

摘　　要：煤化学链气化是实现煤炭资源清洁利用与高效转化的关键技术,是具备新质生产力特色的过程方法,对于可持续发展十分重要。煤化学链气化过程主要涉及煤中不同显微组分在载氧体作用下与气化剂的反应,但不同显微组分转化行为和机制的区别仍不明确。研究采用热重分析法探究庆华烟煤显微镜质组和惰质组的化学链气化特性,基于气固反应模型对化学链气化反应的动力学进行分析。结果显示,显微镜质组和惰质组的化学链气化反应均对应3个反应阶段,相同温度下镜质组反应活性高于惰质组。由于惰质组结构较镜质组更稳定,镍基载氧体对镜质组的催化作用更显著。不同气化温度下,显微组分的碳转化率均随着气化反应时间增加而呈现增加趋势。基于3种气固反应动力学模型拟合结果,球对称收缩核模型能够较好反映庆华烟煤显微组分的化学链气化反应过程,该模型为最佳机理函数。选择该模型对化学链气化反应动力学参数开展了计算。镜质组和惰质组化学链气化反应的活化能值分别为169.78、176.46kJ/mol。惰质组化学链气化反应的活化能较高,说明相较于镜质组而言惰质组的化学链气化反应性较差,需要在反应中重点强化。Coal chemical looping gasification(CLG)is a pivotal technology for the clean utilization and efficient transformation of coal resources.It represents a novel and high-quality approach with distinctive innovative productivity and holds significant importance for sustainability.Coal CLG process mainly involves the reaction of different organic macerals in coal with gasification agents under the action of oxygen carriers(OCs).However,the differences in the transformation behavior and mechanism of these macerals remain unclear.In this study,we used thermo-gravimetric analysis(TGA)to investigate the CLG characteristics of the vitrinite and inertinite components of Qinghua bituminous coal.We also analyzed the kinetics of CLG reaction based on gas-solid reaction models.The results showed that the chemical looping gasification reactions of vitrinite and inertinite correspond to three distinct reaction stages.The reactivity of vitrinite was higher than that of inertinite at the same temperature.This is attributed to the greater structural stability of the inertinite compared to the vitrinite.Additionally,nickel-based OCs exhibited a more pronounced catalytic effect upon the vitrinite.At different gasification temperatures,the carbon conversion rate of organic macerals increased with the gasification reaction time.Based on the fitting results of three gas-solid reaction kinetic models,the spherical shrinking core model effectively represented the CLG process of the microcomponents in Qinghua bituminous coal.It emerged as the optimal mechanistic function.This model was selected to calculate the kinetic parameters of the CLG reaction.The activation energies for the vitrinite and inertinite were 169.78 kJ/mol and 176.46 kJ/mol,respectively.The higher activation energy of the inertinite indicates that it has poorer chemical looping gasification reactivity compared to vitrinite.This difference needs to be emphasized in the reaction process.

关 键 词：化学链 载氧体 烟煤 显微组分 镜质组 

分 类 号：TQ546[化学工程—煤化学工程]