地下煤气化合成气的脱碳提氢耦合工艺探讨  

Discussion on coupling process of decarbonization and hydrogen extraction for underground coal gasification syngas

作　　者：王涛 史世杰 曾丽瑶 罗珊 周振华 丁锋 王召民 高继峰 WANG Tao;SHI Shijie;ZENG Liyao;LUO Shan;ZHOU Zhenhua;DING Feng;WANG Zhaomin;GAO Jifeng(SINOPEC Petroleum Engineering Zhongyuan Corporation,Zhengzhou 451000,Henan,China;SINOPEC Petroleum Engineering&Construction Corporation,Beijing 100020,China)

机构地区：[1]中石化中原石油工程设计有限公司,河南郑州451000 [2]中石化石油工程建设有限公司,北京100020

出　　处：《低碳化学与化工》2024年第1期125-132,共8页Low-Carbon Chemistry and Chemical Engineering

基　　金：中石化石油工程公司课题(SG21-48J)。

摘　　要：针对煤炭地下气化(UCG)技术制备的合成气具有温度高(>200℃)、压力大(3.35 MPa)、饱和含水量大及组分复杂(含CH_(4)、H_(2)、CO_(2)和CO等)的特点,设计并采用膜分离+溶剂吸收耦合的处理方法以实现地下煤合成气中CO_(2)的脱除和H_(2)的提纯。地下煤合成气经过二级膜分离单元的处理,实现了CO_(2)/H_(2)与CH_(4)的分离并得到了脱碳净化气,其中CO_(2)含量(物质的量分数)≤3%,该膜分离工艺所需能耗为0.297 k W·h/m^(3)。使用醇胺吸收法处理CO_(2)/H_(2)混合气,并通过配方溶液筛选、工艺流程优化和校验分析等方法开展了研究,最终得到了H_(2)纯度(物质的量分数)≥99%的产品,该醇胺吸收法的能耗为0.341 k W·h/m^(3)。使用膜分离+溶剂吸收耦合处理复杂工况的地下煤合成气,可得到脱碳净化气、纯CO_(2)和工业级H_(2),提高了项目的经济价值,具有较大的应用潜力。In response to the characteristics of high synthesis gas temperature (>200℃),high pressure (3.35 MPa),high saturated water content and complex components (including CH_(4),H_(2),CO_(2),CO,etc.) prepared by underground coal gasification (UCG) technology,a membrane separation+solvent absorption coupling treatment method was designed to achieve CO_(2) removal and H_(2) purification from underground coal gasification syngas.The underground coal gasification syngas was treated by a secondary membrane separation unit to achieve the separation of CO_(2)/H_(2) and CH_(4),and the decarbonized purified gas is obtained,where the CO_(2) content (mole fraction) is less than 3%.The energy consumption required for this membrane separation process is 0.297 k W·h/m^(3).The CO_(2)/H_(2) mixture was treated by amine absorption method,and the research was conducted by the methods of formula solution screening,process optimization and check analysis.Finally,the product with H_(2) purity (mole fraction)≥99%is obtained.The energy consumption of the amine absorption method is 0.341 k W·h/m^(3).Using membrane separation+solvent absorption coupling treatment method to treat underground coal synthesis gas under complex working conditions,decarbonized purified gas,pure CO_(2) and industrial grade H_(2) can be obtained,greatly improving the economic value of the project and having great application potential.

关 键 词：地下煤气化 膜分离 溶液吸收法 脱碳 提氢 

分 类 号：TQ54[化学工程—煤化学工程]