摘要
对部分干气再循环工艺(RSV)进行了模拟,处理高含CO_(2)(2.0%~3.5%,物质的量分数)凝析气,发现乙烷回收率小于90%,且对原料气中CO_(2)含量波动适应性差。从脱甲烷塔顶进料气质和脱甲烷塔结构两方面进行了改进,提出了部分原料气过冷乙烷回收工艺(SVFS)、两塔型部分原料气过冷乙烷回收工艺(SVFS-2T)。对SVFS-2T工艺进一步分析发现,增加原料气过冷分流比可提高吸收塔CO_(2)冻堵裕量;而增加原料气过冷分流比、低温分离器液相分流比及降低脱甲烷塔顶分离器温度可提高乙烷回收率;在原料气CO_(2)含量3.0%~3.2%情况下,改进工艺的乙烷回收率可达到90%;随着CO_(2)含量增加,与RSV工艺相比改进工艺的总压缩功耗减少2.8%~5.2%。
The partial dry gas recirculation(RSV)process to treat condensate gas with high CO_(2) content(2.0%-3.5%,mole fraction)was simulated.It is found that the ethane recovery rate is less than 90%,the process has poor adaptability to the fluctuation of CO_(2) content in the raw gas.Improvements were made from the top feed gas quality of the demethanizer and the structure of the demethanizer,and the Split-Vapor and Feed Subcooled(SVFS)process and the Split-Vapor and Feed Subcooled-2Tower(SVFS-2T)process were proposed.Through further analysis of the SVFS-2T process,it is found that increasing the feed gas subcooling split ratio can increase the CO_(2) freeze-blocking margin of the absorption tower,increasing the subcooling split ratio of feed gas,the liquid phase split ratio of the cryogenic separator and lowering the temperature of the separator at the top of the demethanizer can increase the ethane recovery rate.When the CO_(2) content of the feed gas is 3.0%-3.2%,the ethane recovery rate of the improved process can reach 90%.With the increase of CO_(2) content,the total compression power consumption of the improved process is reduced by 2.8%-5.2%compared with the RSV process.
作者
朱倩谊
易驰
杨雨林
李玮
彭清华
张伟
杨冬磊
李乐
ZHU Qian-yi;YI Chi;YANG Yu-lin;LI Wei;PENG Qing-hua;ZHANG Wei;YANG Dong-lei;LI Le(School of Public Utilities,Jiangsu Urban and Rural Construction Vocational College,Changzhou 213147,Jiangsu,China;School of Materials and Science Engineering,Changzhou University,Changzhou 213147,Jiangsu,China;Oil and Gas Transportation and Marketing Department,PetroChina Tarim Oilfield Company,Kuerle 841000,Xinjiang,China;Chengdu China Resources Gas Design Co.,Ltd.,Chengdu 610000,Sichuan,China;PetroChina Natural Gas Co.,Ltd.Natural Gas Sales Jiangxi Branch,Nanchang 330000,Jiangxi,China)
出处
《天然气化工—C1化学与化工》
CAS
北大核心
2021年第3期107-113,127,共8页
Natural Gas Chemical Industry
基金
苏城建院2019年度校级自然科学课题(2019KYC019)
苏城建院2019年度校级自然科学课题(2019KYC003)。
关键词
二氧化碳
中压凝析气
乙烷回收
工艺改进
适应性分析
CO_(2)
medium pressure condensate gas
ethane recovery
process improvement
adaptability analysis
