用于燃煤电厂烟气CO_(2)捕集的新型节能工艺  

Novel Energy-Saving Process for CO_(2)Capture from Flue Gas in Coal-fired Power Plant

作　　者：龚杰松 王宇宁 周嘉斌 陈志远 纳薇[2,3] 郑敏[3] 王华[2,3] 高文桂[2,3] GONG Jiesong;WANG Yuning;ZHOU Jiabin;CHEN Zhiyuan;NA Wei;ZHENG Min;WANG Hua;GAO Wengui(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650093 [2]昆明理工大学冶金与能源工程学院,云南昆明650093 [3]昆明理工大学复杂有色金属资源清洁利用国家重点实验室,云南昆明650093

出　　处：《化学反应工程与工艺》2024年第5期436-444,共9页Chemical Reaction Engineering and Technology

基　　金：云南省重大科技专项计划项目(202302AG050005-2)。

摘　　要：使用单乙醇胺(MEA)进行碳捕集的工艺存在一个关键问题:进行溶剂再生需要大量再沸器热能。为了降低再沸器的热量需求,本研究提供了一种新型的节能工艺,该工艺在富蒸汽压缩(RVC)的工艺方案中引入了富液预热器(RSP),其中富液预热器的热源是燃煤电厂脱硫前的烟气。为显示该RVC+RSP工艺的协同效应和节能效果,采用Aspen Plus分别对基础工艺、RVC工艺、RSP工艺和RVC+RSP工艺进行建模,之后对每个工艺进行节能分析,并评估新型耦合工艺和基础工艺在操作参数发生变化时对节能效果的影响。结果表明:在RVC工艺中引入RSP后,捕获每单位二氧化碳的再生能耗从3.86 MJ/kg降至2.47 MJ/kg,与基础的工艺方案相比,RVC+RSP工艺节省了38.4%的再沸器能耗和19%的总等效能耗,在操作参数波动时该耦合工艺依然能够节约16%以上的等效能耗。The process of carbon capture using monoethanolamine(MEA)suffers from a critical problem:a large amount of reboiler heat is required to perform solvent regeneration,and in order to reduce the heat demand of the reboiler,this study provides a novel energy-saving process.The process introduced a rich solvent preheater(RSP)in a rich vapour compression(RVC)process plan,where the heat source for the RSP was the flue gas from a coal-fired power plant before desulphurisation.In order to show the synergistic effect and energy savings of the RSP+PVC process,the base process,the RVC process,the RSP process and the RVC+RSP process were modelled in Aspen Plus in this study.Afterwards,each process was analysed for energy savings and the impact of the novel coupled process and the base process on energy savings was assessed in the event of changes in operating parameters.With the introduction of RSP in the RVC process,the regeneration energy consumption per unit of CO_(2)captured was reduced from 3.86 MJ/kg to 2.47 MJ/kg.Compared to the base process plan,savings of 38.4%in reboiler heat consumption saving and 19%in total energy saving were achieved.The results of the evaluation showed that the coupled process was still able to provide equivalent energy savings of more than 16%at fluctuating operating parameters.

关 键 词：碳捕集 烟气废热 富液预热器 能耗评估 燃煤电厂 

分 类 号：TQ413.21[化学工程]