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作 者:程相龙 郭晋菊 张延兵 辛坤涵 任海波 马名杰[2] 张海永[3] CHENG Xianglong;GUO Jinju;ZHANG Yanbing;XIN Kunhan;REN Haibo;MA Mingjie;ZHANG Haiyong(School of Materials and Chemical Engineering, Henan University of Urban Construction, 467036 Pingdingshan, China;School of Materials and Chemical Engineering, Henan Polytechnic University, 454150 Jiaozuo, China;School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), 100083 Beijing, China)
机构地区:[1]河南城建学院材料与化工学院,河南平顶山467036 [2]河南理工大学材料科学与工程学院,河南焦作454150 [3]中国矿业大学(北京)化学与环境工程学院,北京100083
出 处:《煤炭转化》2021年第6期81-94,共14页Coal Conversion
基 金:国家自然科学基金资助项目(21506251);河南省科技攻关计划项目(202102310238).
摘 要:以夹带流反应器、流化床反应器和热重分析仪三种传统反应器类型为主线,分析和讨论了褐煤氧化反应与水蒸气气化反应的协同作用及气化动力学等方面的研究进展。分析认为,在夹带流和流化床中发现的协同作用是由于氧化反应开孔和扩孔作用丰富了半焦孔隙,同时促进了半焦中CO键和—C—O键的断裂和高活性COO—的生成,但协同作用的微观机理、差异性(夹带流反应器中协同作用较强)及其对气化动力学和反应器建模影响的定量表达等均有待研究,而目前研究多是在外热式条件下开展的,研究自热条件下协同作用更有应用价值;缩核和随机孔等模型的气化动力学方程是特定条件下的“产物”,在应用时研究者应重新推导自己实验条件下的方程;压力对气化速率的影响主要取决于气化剂分压,氧载体可以方便地改变气化剂分压,H_(2)O和CO_(2)分压对气化速率的影响分别与氧交换、双复合物机理吻合。In this paper,these studies are classified and summarized according to the reactor types,such as entrained flow,fluidized bed,and TG.Correspondingly,main research findings and progress are discussed,such as synergistic effect of the oxidation and gasification reactionsand gasification kinetics.It is concluded that the synergistic effect found in the entrained flow reactor and the fluidized bed reactoris due to that the oxidation reaction can make more carbon active sites being exposed by producing microspores and mesopores,and prompt small groups as>CO&>C—O—being fractured while prompt the generation of COO—.However,its mechanism,different performance(stronger synergistic effect in the entrained flow reactor)and quantitative expression in the gasification kinetics and the reactor modeling process are not yet clear.And most researches are carried out under the external heating condition.However,the study under the autothermal condition should be more valuable.The kinetic equation of the unreacted shrinking core model and the random pore model are subject to the specific conditions,and researchers should derive the equations according to their specific experimental conditions.The effect of the pressure on the gasification rate is mainly dependent on the partial pressure of the gasification agent,which could be easily changed by the oxygen carrier.The effect of the H_(2)O and CO_(2) partial pressure on the gasification rate is in accordance with the oxygen exchange mechanism and the double compound mechanism,respectively.This research is expected to provide references for the further study and research directions.
分 类 号:TQ53[化学工程—煤化学工程]
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