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
王涛 1史世杰 1曾丽瑶 1罗珊 1周振华 1丁锋 1王召民 2高继峰1
作者信息
- 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
- 折叠
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CH4、H2、CO2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CO2的脱除和H2的提纯.地下煤合成气经过二级膜分离单元的处理,实现了CO2/H2与CH4的分离并得到了脱碳净化气,其中CO2含量(物质的量分数)≤3%,该膜分离工艺所需能耗为0.297 kW·h/m3.使用醇胺吸收法处理CO2/H2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H2纯度(物质的量分数)≥99%的产品,该醇胺吸收法的能耗为0.341 kW·h/m3.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CO2和工业级H2,提高了项目的经济价值,具有较大的应用潜力.
Abstract
In response to the characteristics of high synthesis gas temperature(＞200℃),high pressure(3.35 MPa),high saturated water content and complex components(including CH4,H2,CO2,CO,etc.)prepared by underground coal gasification(UCG)technology,a membrane separation + solvent absorption coupling treatment method was designed to achieve CO2 removal and H2 purification from underground coal gasification syngas.The underground coal gasification syngas was treated by a secondary membrane separation unit to achieve the separation of CO2/H2 and CH4,and the decarbonized purified gas is obtained,where the CO2 content(mole fraction)is less than 3%.The energy consumption required for this membrane separation process is 0.297 kW·h/m3.The CO2/H2 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 H2 purity(mole fraction)≥99%is obtained.The energy consumption of the amine absorption method is 0.341 kW·h/m3.Using membrane separation + solvent absorption coupling treatment method to treat underground coal synthesis gas under complex working conditions,decarbonized purified gas,pure CO2 and industrial grade H2 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Key words
underground coal gasification/membrane separation/solvent absorption method/decarbonization/hydrogen extraction引用本文复制引用
基金项目
中国石化石油工程公司课题(SG21-48J)
出版年
2024
国家科技期刊平台
NSTL
万方数据