CCUS背景下的伴生气中CO_(2)回收工艺技术研究  

Research on CO_(2)recovery technology in associated gas under CCUS background

作　　者：田春 祁宝萍 金毅浪 李祁峰 TIAN Chun;QI Baoping;JIN Yilang;LI Qifeng(North China Company of China Petroleum Engineering&Construction Corp.;No.2 Oil Production Plant of Huabei Oilfield Company,CNPC;Northwest Sichuan Gas District of Southwest Oil&Gasfield Company,CNPC;Oil&Gas Metering Center of Southwest Pipeline Co.,Ltd.,PipeChina)

机构地区：[1]中国石油工程建设有限公司华北分公司,河北省任丘市062550 [2]中国石油华北油田公司第二采油厂 [3]中国石油西南油气田分公司川西北气矿 [4]国家管网集团西南管道有限责任公司油气计量中心

出　　处：《石油石化节能与计量》2025年第2期57-62,共6页Energy Conservation and Measurement in Petroleum & Petrochemical Industry

摘　　要：针对油田实施CCUS技术后,生产井伴生气中CO_(2)含量超标,现有工艺无法适应伴生气的处理等问题,在分析组分变化及CO_(2)分离特性的基础上,确定了采用萃取精馏的方式完成CO_(2)分离,对比了三塔工艺和四塔工艺在各方面的差异性,并针对四塔工艺的相关参数进行了模拟优化。结果表明,四塔工艺可直接产出液态CO_(2),与三塔工艺相比,脱乙烷塔塔底的温度较低,CO_(2)产量相对较高,综合能耗和比功耗相对较低,实现了CH_(4)和液态CO_(2)合格产品的双输出;多项工艺参数优化后,总能耗从1823 kW降低至1327 kW,降幅27.2%,CO_(2)产品纯度从95.21%提升至99.12%。研究结果可为CCUS技术中碳捕集的循环利用提供理论依据和实际参考。After the implementation of CCUS technology in oilfield,the CO_(2)content of the associated gas in the production well exceeds the standard,and the existing process cannot adapt to the treatment of associated gas.Based on the analysis of component changes and CO_(2)separation characteristics,the method of extractive distillation is determined to complete the CO_(2)separation,and the differences between the three-tower process and the four-tower process are compared in various aspects.The relevant parameters of the four-tower process are simulated and optimized.The results show that the four-tower process can directly produce liquid CO_(2).Compared with the three-tower process,the bottom temperature of the deethanization tower is lower,the CO_(2)production is relatively higher,the comprehensive energy consumption and specific power consumption are relatively lower,which realizes the double output of CH_(4) and liquid CO_(2)products.After the optimization of several process parameters,the total energy consumption is reduced from 1823 kW to 1327 kW,with a decrease of 27.2%,and the purity of CO_(2)products is increased from 95.21%to 99.12%.The results can provide theoretical basis and practical reference for the recycling of carbon capture in CCUS technology.

关 键 词：CO_(2)-C_(2)H_(6)二元体系 伴生气 萃取精馏 比功耗 产品纯度 

分 类 号：X70[环境科学与工程—环境工程]