MDEA脱碳装置模拟与优化
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摘要
CO2脱除是天然气预处理等工业过程的重要工序之一,在天然气终端处理厂,特别是海上气田陆上终端,受气田开采周期及产量波动影响,装置通常分期建设,往往导致脱碳单元设计工况与实际工况偏差较大。针对实际工况合理选择操作参数对装置稳定运行、节能降耗及提高经济效益有重要意义。应用Aspen HYSYS软件对某天然气陆上终端一套采用MDEA工艺的脱碳装置进行了模拟及优化。对闪蒸塔压力、贫液及半贫液循环量配比等参数进行工况研究的结果表明:对于该装置,闪蒸塔压力由680 k Pa调整为830 k Pa,即富液压降为2 250 k Pa时,回收闪蒸气生产脱碳气,可以解决吸收塔底富液闪蒸气放空的问题;同时,贫液循环量由120 m3/h调整为100 m3/h,半贫液循环量调整为470 m3/h时能够有效降低脱碳工序能耗,增加脱碳气产量。研究结果对现场生产实现降本增效具有参考作用,闪蒸气回收方案在同类型装置中具有一定的推广性。
CO_2 removal process occupies an important position in industries such as natural gas pretreatment. In natural gas refining plant,especially for offshore gas field,off design conditions are quite normal in CO_2 removal unit due to yield fluctuation. In this paper,function of case studies in Aspen HYSYS was used in simulation of CO_2 removal process using MDEA amine to find optimal operation parameters such as flash column pressure,ratio between lean amine and semi lean solution. It was shown that the operating parameters of flash column pressure was adjusted from 680 k Pa to 830 k Pa,which means when liquid pressure drop was 2 250 k Pa,the flash gas was recyclable. As for a further comment,when lean solution circulation was adjusted from 120 m~3/h to 100 m~3/h,and semilean solution circulation adjusted to 470 m~3/h,lower energy consumption and better economic benefit would be achieved in this CO_2 removal process. The case study can be used as a guide to realize cost reduction and efficiency enhancement in field production,and the design of flash gas recovery can be promoted in similar unit.
CO_2 removal process occupies an important position in industries such as natural gas pretreatment. In natural gas refining plant,especially for offshore gas field,off design conditions are quite normal in CO_2 removal unit due to yield fluctuation. In this paper,function of case studies in Aspen HYSYS was used in simulation of CO_2 removal process using MDEA amine to find optimal operation parameters such as flash column pressure,ratio between lean amine and semi lean solution. It was shown that the operating parameters of flash column pressure was adjusted from 680 k Pa to 830 k Pa,which means when liquid pressure drop was 2 250 k Pa,the flash gas was recyclable. As for a further comment,when lean solution circulation was adjusted from 120 m~3/h to 100 m~3/h,and semilean solution circulation adjusted to 470 m~3/h,lower energy consumption and better economic benefit would be achieved in this CO_2 removal process. The case study can be used as a guide to realize cost reduction and efficiency enhancement in field production,and the design of flash gas recovery can be promoted in similar unit.
引文
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[12]Fujiao Song,Yunxia Zhao,Qin Zhong.Adsorption of Carbon Dioxide on Amine-modified Ti O2Nanotubes[J].Journal of Environmental Sciences,2013,25(3):554-560.
[13]Hongbin Xie,Pan Wang,Ning He,et al.Toward Rational Design of Amines for CO2Capture:Substituent Effect on Kinetic Process for The Reaction of Monoethanolamine with CO2[J].Journal of Environmental Sciences,2015,37(11):75-82.
[14]Tan L S,Lau K K,Bustam M A,et al.Removal of High Concentration CO2from Natural Gas at Elevated Pressure via Absorption Process in Packed Column[J].Journal of Natural Gas Chemistry,2012,21(1):7-10.
[15]李士富.油气处理工艺及计算[M].北京:中国石化出版社,2010.Li Shifu.Oil and Gas Treatment Process and Calculation[M].Beijing:China Petrochemical Press,2010.
[16]陈健,密建国,唐宏青.N-甲基二乙醇胺(MDEA)脱碳流程模拟研究[J].化学工程,2001,29(1):14-17.Chen Jian,Mi Jianguo,Tang Hongqing.A Study on Process Simulation for the Carbon Dioxide Removal with MDEA[J].Chemical Engineering,2001,29(1):14-17.
[17]马云,张吉磊,王新星,等.天然气甲基二乙醇胺法脱硫脱碳工艺过程模拟分析[J].化学工程,2015,43(4):69-74.Ma Yun,Zhang Jilei,Wang Xinxing,et al.Simulation of Natural Gas Methyldiethanolamine Decarbonization and Desulphurization Press[J].Chemical Engineering,2015,43(4):69-74.
[18]宋彬,陈赓良,罗云峰,等.醇胺法工艺模型化与模拟计算[M].北京:石油工业出版社,2011.Song Bin,Chen Gengliang,Luo Yunfeng,et al.Modelling and Simulation of Alkanolamine Purification Process[M].Beijing:Petroleum Industry Press,2011.
[19]唐浠,瞿杨,陈庭库,等.天然气净化厂MDEA再生系统优化运行探讨[J].石油与天然气化工,2014,43(5):492-496.Tang Xi,Qu Yang,Chen Tingku,et al.Optimal Operation of MDEA Regeneration System in Natural Gas Purification Plant[J].Chemical Engineering of Oil&Gas,2014,43(5):492-496.
[20]张立胜,裴爱霞,术阿杰,等.特大型天然气净化装置液力透平能量回收技术优化[J].天然气工业,2012,32(7):72-76.Zhang Lisheng,Pei Aixia,Shu Ajie,et al.Optimization of Power Recovery Turbine in the Ultra-Large Natural Gas Purification Plant,Puguang Gasfield[J].Natural Gas Industry,2012,32(7):72-76.
[2]王智力,黄爱斌,陈平,等.N-甲基二乙醇胺溶液对H2S和CO2的吸收模拟[J].化学工程,2010,38(6):5-9.Wang Zhili,Huang Aibin,Chen Ping,et al.Simulation of Absorbing H2S and CO2into Aqueous N-methyldienthanolamine Solution[J].Chemical Engineering,2010,38(6):5-9.
[3]刘练波,郜时旺,牛红伟.烟气CO2捕集工艺过程关键问题分析[J].中国电力,2014,47(2):130-134.Liu Lianbo,Gao Shiwang,Niu Hongwei.Study on Some Key Issues in the Process of Carbon Dioxide Capture Technology for Flue Gas[J].Electric Power,2014,47(2):130-134.
[4]李娜,何丽娟,焦坤灵,等.MDEA-TETA混合液捕集电厂烟气中CO2的实验研究[J].环境科学学报,2016,36(10):3576-3580.Li Na,He Lijuan,Jiao Kunling,et al.Experimental Study of CO2Capture from Plant Flue Gas Using MDEA-TETA Mixed Liquid[J].Acta Scientiae Circumstantiae,2016,36(10):3576-3580.
[5]戴海林,于景化,张相兵,等.天然气处理厂脱除油田伴生气中CO2技术分析与应用[J].现代化工,2013,33(4):103-105.Dai Hailin,Yu Jinghua,Zhang Xiangbing,et al.Analysis and Application of CO2Removal Technology of Oilfield Associated Gas in Natural Gas Processing Plant[J].Modern Chemical Industry,2013,33(4):103-105.
[6]王开岳.天然气净化工艺[M].北京:石油工业出版社,2005.Wang Kaiyue.Natural Gas Purification Process[M].Beijing:Petroleum Industry Press,2005.
[7]李志娟,曹利,黄学敏.膜法氨水吸收脱除烟气中CO2的研究[J].环境科学学报,2016,36(3):1050-1056.Li Zhijuan,Cao Li,Huang Xuemin.Ammonia Absorption of CO2from Flue Gas Using Hollow Fiber Membrane[J].Acta Scientiae Circumstantiae,2016,36(3):1050-1056.
[8]林名桢,贾建昌,王翀,等.CO2低温分馏提纯工艺优化与研究[J].石油与天然气化工,2012,41(6):547-550.Lin Mingzhen,Jia Jianchang,Wang Chong,et al.Optimization and Study of CO2Low Temperature Fractionation Purification Process[J].Chemical Engineering of Oil&Gas,2012,41(6):547-550.
[9]杨彦钢,丁艳宾,马正飞,等.复合床层变压吸附法脱除合成气中微量CO和CO2[J].化学工程,2012,40(8):42-46.Yang Yangang,Ding Yanbin,Ma Zhengfei,et al.Removal of CO and CO2from Ammonia Synthesis Gas by Pressure Swing Adsorption with Layered Bed[J].Chemical Engineering,2012,40(8):42-46.
[10]薛全民,周亚平,苏伟.甲基二乙醇胺水溶液吸收CO2的研究[J].化学工程,2009,37(9):1-4.Xue Quanmin,Zhou Yaping,Su Wei.Study on Absorption of CO2into Aqueous N-methyldienthanolamine[J].Chemical Engineering,2009,37(9):1-4.
[11]张亚萍,刘建周,季芹芹,等.醇胺法捕集燃煤烟气CO2工艺模拟及优化[J].化工进展,2013,32(4):930-935.Zhang Yaping,Liu Jianzhou,Ji Qinqin,et al.Process Simulation and Optimization of Flue Gas CO2Capture by the Alkanolamine Solutions[J].Chemical Industry and Engineering Progress,2013,32(4):930-935.
[12]Fujiao Song,Yunxia Zhao,Qin Zhong.Adsorption of Carbon Dioxide on Amine-modified Ti O2Nanotubes[J].Journal of Environmental Sciences,2013,25(3):554-560.
[13]Hongbin Xie,Pan Wang,Ning He,et al.Toward Rational Design of Amines for CO2Capture:Substituent Effect on Kinetic Process for The Reaction of Monoethanolamine with CO2[J].Journal of Environmental Sciences,2015,37(11):75-82.
[14]Tan L S,Lau K K,Bustam M A,et al.Removal of High Concentration CO2from Natural Gas at Elevated Pressure via Absorption Process in Packed Column[J].Journal of Natural Gas Chemistry,2012,21(1):7-10.
[15]李士富.油气处理工艺及计算[M].北京:中国石化出版社,2010.Li Shifu.Oil and Gas Treatment Process and Calculation[M].Beijing:China Petrochemical Press,2010.
[16]陈健,密建国,唐宏青.N-甲基二乙醇胺(MDEA)脱碳流程模拟研究[J].化学工程,2001,29(1):14-17.Chen Jian,Mi Jianguo,Tang Hongqing.A Study on Process Simulation for the Carbon Dioxide Removal with MDEA[J].Chemical Engineering,2001,29(1):14-17.
[17]马云,张吉磊,王新星,等.天然气甲基二乙醇胺法脱硫脱碳工艺过程模拟分析[J].化学工程,2015,43(4):69-74.Ma Yun,Zhang Jilei,Wang Xinxing,et al.Simulation of Natural Gas Methyldiethanolamine Decarbonization and Desulphurization Press[J].Chemical Engineering,2015,43(4):69-74.
[18]宋彬,陈赓良,罗云峰,等.醇胺法工艺模型化与模拟计算[M].北京:石油工业出版社,2011.Song Bin,Chen Gengliang,Luo Yunfeng,et al.Modelling and Simulation of Alkanolamine Purification Process[M].Beijing:Petroleum Industry Press,2011.
[19]唐浠,瞿杨,陈庭库,等.天然气净化厂MDEA再生系统优化运行探讨[J].石油与天然气化工,2014,43(5):492-496.Tang Xi,Qu Yang,Chen Tingku,et al.Optimal Operation of MDEA Regeneration System in Natural Gas Purification Plant[J].Chemical Engineering of Oil&Gas,2014,43(5):492-496.
[20]张立胜,裴爱霞,术阿杰,等.特大型天然气净化装置液力透平能量回收技术优化[J].天然气工业,2012,32(7):72-76.Zhang Lisheng,Pei Aixia,Shu Ajie,et al.Optimization of Power Recovery Turbine in the Ultra-Large Natural Gas Purification Plant,Puguang Gasfield[J].Natural Gas Industry,2012,32(7):72-76.