“渤海蓬勃”号FPSO露点控制系统乙二醇损耗原因分析及应对措施
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摘要
"渤海蓬勃"号FPSO露点控制系统由于设备老化、流程状态改变等原因,存在水合物抑制剂乙二醇损耗量偏大的问题。在对露点控制系统工艺流程和参数进行分析的基础上,运用HYSYS软件建立模型进行模拟计算,结合现场试验,对乙二醇注入浓度和注入量、重沸器塔底温度、乙二醇进入干气、乙二醇进入轻烃回收流程、轻烃进入乙二醇再生系统、闪蒸罐油室、排污阀内漏或误打开等方面原因进行了分析,结果表明:乙二醇发泡、操作温度低导致乙二醇进入轻烃回收流程和轻烃进入乙二醇再生系统是造成乙二醇损耗高的主要原因;乙二醇注入量偏大是造成乙二醇损耗高的次要原因。提出了定期排烃、添加消泡剂和降低乙醇注入量等3种应对措施,现场实施效果表明,"渤海蓬勃"号FPSO露点控制系统运行可靠,乙二醇平均日消耗量从450L降低至130L,有效解决了乙二醇损耗量大的难题,取得了可观的社会和经济效益。
Due to aging of equipment,changes in process state and other reasons,BHPB FPSO is challenged with a problem of increasing loss of glycol as hydrate inhibitor in the dew point control unit.The process and parameters of the dew point control unit was analyzed,and one model was then built by using HYSYS on this basis for simulation calculation.Combining with field tests,the cause analysis was conducted on the aspects of injection concentration and injection volume of glycol,bottom temperature of reboiler,process of glycol entering into dry gas,recovery process of glycol entering into light hydrocarbon,light hydrocarbon entering into glycol regeneration system,mistaken emissions of flash drum,and internal leakage or misoperation of drain valve.The analysis results prove that the primary cause for increasing loss of glycol was that glycol enters into light hydrocarbon recovery process and light hydrocarbon enters into glycol regeneration system due to foaming of glycol and low operating temperature;and the secondary cause was large injection volume of glycol.Three countermeasures were proposed,including regular hydrocarbon expulsion,addition of defoamer and reduction of injection volume,and good field application result was achieved,where the dew point control unit of BHPB FPSO works reliably and the average daily consumption of glycol has been decreased from 450 Lto 130 L.The problem of increasing loss of glycol was effectively solved and considerable social and economic benefits have been obtained.
Due to aging of equipment,changes in process state and other reasons,BHPB FPSO is challenged with a problem of increasing loss of glycol as hydrate inhibitor in the dew point control unit.The process and parameters of the dew point control unit was analyzed,and one model was then built by using HYSYS on this basis for simulation calculation.Combining with field tests,the cause analysis was conducted on the aspects of injection concentration and injection volume of glycol,bottom temperature of reboiler,process of glycol entering into dry gas,recovery process of glycol entering into light hydrocarbon,light hydrocarbon entering into glycol regeneration system,mistaken emissions of flash drum,and internal leakage or misoperation of drain valve.The analysis results prove that the primary cause for increasing loss of glycol was that glycol enters into light hydrocarbon recovery process and light hydrocarbon enters into glycol regeneration system due to foaming of glycol and low operating temperature;and the secondary cause was large injection volume of glycol.Three countermeasures were proposed,including regular hydrocarbon expulsion,addition of defoamer and reduction of injection volume,and good field application result was achieved,where the dew point control unit of BHPB FPSO works reliably and the average daily consumption of glycol has been decreased from 450 Lto 130 L.The problem of increasing loss of glycol was effectively solved and considerable social and economic benefits have been obtained.
引文
[1]梁平,单华,雷政,等.克拉2气田中央处理厂降低乙二醇损耗措施[J].天然气工业,2008,28(6):124-126.LIANG Ping,SHAN Hua,LEI Zheng,et al.Measures for reducing glycol loss at the central natural gas processing plant in the Kela-2gas field[J].Nature Gas Industry,2008,28(6):124-126.
[2]陶波,王同峰,刘永明,等.乙二醇在天然气处理工艺中的损耗分析与研究[J].化学工程与装备,2013(9):89-90.TAO Bo,WANG Tongfeng,LIU Yongming,et al.Analysis and study of the consumption of ethylene glycol in natural gas treatment process[J].Chemical Engineering&Equipment,2013(9):89-90.
[3]马全天,王玉,杜福祥,等.牙哈气田凝析气处理装置乙二醇系统工艺优化[J].天然气工业,2006,26(1):141-142.MA Quantian,WANG Yu,DU Fuxiang,et al.Process optimization for glycol subsystem of Yaha condensate gas processing plant[J].Nature Gas Industry,2006,26(1):141-142.
[4]任缘.乙二醇的损耗控制措施研究及其循环工艺参数优化[D].重庆:重庆科技学院,2016.REN Yuan.Study on the consumption control of ethylene glycol and the optimization of its cycle process parameters[D].Chongqing:Chongqing University of Science and Technology,2016.
[5] MOHAMMADI A H,ESLAMIMANESH A,YAZDIZADEH M,et al.Glycol loss in a gaseous system:Thermodynamic assessment test of experimental solubility data[J].Journal of Chemical&Engineering Data,2011,56(11):4012-4016.
[6] MOYER G A.Glycol regeneration:U.S.Patent 4,010,009[P].1977-3-1.
[7] ESLAMIMANESH A,MOHAMMADI A H,YAZDIZADEH M,et al.Chrastil-type approach for representation of glycol loss in gaseous system[J].Industrial&Engineering Chemistry Research,2011,50(17):10373-10379.
[8] GHARAGHEIZI F,ESLAMIMANESH A,MOHAMMADI A H,et al.Assessment test for glycol loss in gaseous system[J].Fuel processing technology,2013,115:254-260.
[9] GANDHIDASAN P.Parametric analysis of natural gas dehydration by a triethylene glycol solution[J].Energy Sources,2003,25(3):189-201.
[10] SCHIEVELBEIN V H,PIGLIA T J.Glycol dehydration apparatus for natural gas:U.S.Patent 5,141,536[P].1992-8-25.
[11]丁启耀.天然气脱水工艺乙二醇损耗大原因分析及处理[J].广州化工,2013(21):133-135.DING Qiyao.Analysis and treatment of the glycol loss in the process of natural gas treatment[J].Guangzhou Chemical Industry,2013(21):133-135.
[2]陶波,王同峰,刘永明,等.乙二醇在天然气处理工艺中的损耗分析与研究[J].化学工程与装备,2013(9):89-90.TAO Bo,WANG Tongfeng,LIU Yongming,et al.Analysis and study of the consumption of ethylene glycol in natural gas treatment process[J].Chemical Engineering&Equipment,2013(9):89-90.
[3]马全天,王玉,杜福祥,等.牙哈气田凝析气处理装置乙二醇系统工艺优化[J].天然气工业,2006,26(1):141-142.MA Quantian,WANG Yu,DU Fuxiang,et al.Process optimization for glycol subsystem of Yaha condensate gas processing plant[J].Nature Gas Industry,2006,26(1):141-142.
[4]任缘.乙二醇的损耗控制措施研究及其循环工艺参数优化[D].重庆:重庆科技学院,2016.REN Yuan.Study on the consumption control of ethylene glycol and the optimization of its cycle process parameters[D].Chongqing:Chongqing University of Science and Technology,2016.
[5] MOHAMMADI A H,ESLAMIMANESH A,YAZDIZADEH M,et al.Glycol loss in a gaseous system:Thermodynamic assessment test of experimental solubility data[J].Journal of Chemical&Engineering Data,2011,56(11):4012-4016.
[6] MOYER G A.Glycol regeneration:U.S.Patent 4,010,009[P].1977-3-1.
[7] ESLAMIMANESH A,MOHAMMADI A H,YAZDIZADEH M,et al.Chrastil-type approach for representation of glycol loss in gaseous system[J].Industrial&Engineering Chemistry Research,2011,50(17):10373-10379.
[8] GHARAGHEIZI F,ESLAMIMANESH A,MOHAMMADI A H,et al.Assessment test for glycol loss in gaseous system[J].Fuel processing technology,2013,115:254-260.
[9] GANDHIDASAN P.Parametric analysis of natural gas dehydration by a triethylene glycol solution[J].Energy Sources,2003,25(3):189-201.
[10] SCHIEVELBEIN V H,PIGLIA T J.Glycol dehydration apparatus for natural gas:U.S.Patent 5,141,536[P].1992-8-25.
[11]丁启耀.天然气脱水工艺乙二醇损耗大原因分析及处理[J].广州化工,2013(21):133-135.DING Qiyao.Analysis and treatment of the glycol loss in the process of natural gas treatment[J].Guangzhou Chemical Industry,2013(21):133-135.