Optimization of glycol solvent to reduce BTEX emission
SHAN Yong-kang1, JIANG Hong1, HE Guang-mang2
1. College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China; 2. Kuqa Oil and Gas Development Department, PetroChina Tarim Oilfield Company, Kuerle 841000, China
Abstract: By means of conventional glycol dehydration process,the performances of three kinds of glycols (diethylene glycol,monoethylene glycol and triethylene glycol,i.e.DEG,MEG and TEG) are analyzed and compared through evaluating the reboiler load,the loss of glycol and the emission of benzene,toluene,ethylbenzene and xylenes (BTEX).It is found that the loads of dehydration reboiler for DEG and EG are low,the BTEX emission is reduced by more than 90% but the loss amount of glycol is large when the glycol circulation reaches 4 m3·h-1.The loss of glycol can be reduced by recycling glycol.Finally,it is concluded that TEG can be replaced by DEG and EG to solve the problem of excessive emission of BTEX in the regenerated gas when natural gas contains high contents of BTEX.
[1] 王倩.天然气脱水技术现状[J].上海化工,2015,(4):29-31. [2] 罗小军,刘晓天,万书华.分子筛吸附法在高酸性天然气脱水中的应用[J].石油与天然气化工,2007,36(2):118-123. [3] 高莉,蒋洪.三甘醇脱水中再生废气的回收利用[J].油气田地面工程,2017,36(7):47-50. [4] 诸林.天然气加工工程[M].北京:石油工业出版社,2008. [5] 仇登可.三甘醇脱水技术在煤制天然气中影响因素的研究[J].辽宁化工,2016,(9):1194-1197. [6] Pearce R L,Protz J E,Lyon G W.Dry gas to low dew points[J].Hydrocarbon Processing,1972,51(12):79-81. [7] 王开岳.甘醇脱水中的芳烃排放及控制措施[J].油气田地面工程,1997,(5):21-24. [8] Eldemerdash U,Kamarudin K.Assessment of new and improved solvent for pre-elimination of BTEX emissions in glycol dehydration processes[J].Chemical Engineering Research & Design,2016,115:214-220. [9] Braek A M,Almehaideb R A,Darwish N,et al.Optimization of process parameters for glycol unit to mitigate the emission of BTEX/VOCs[J].Process Safety & Environmental Protection,2001,79(4):218-232. [10] 刘佳,邓道明,何思宏.影响TEG脱水装置BTEX排放的工艺因素分析[J].现代化工,2015,35(8):160-164. [11] 陈赓良.天然气三甘醇脱水工艺的技术进展[J].石油与天然气化工,2015,44(6):1-9. [12] Covington K,Lyddon L,Ebeling H.Reduce emissions and operating costs with appropriate glycol selection[A].77th Annual Convention of the Gas-Processors-Association[C].DALLAS TX,1998. [13] 贺三,刘阳,樊林华,等.DRIZO脱水工艺模拟分析[J].天然气与石油,2016,34(1):44-48. [14] 郝蕴.三甘醇脱水工艺探讨[J].中国海上油气,2001,13(3):22-29. [15] Saidi M,Parhoudeh M,Rahimpour M R.Mitigation of BTEX emission from gas dehydration unit by application of Drizo process:A case study in Farashband gas processing plant;Iran[J].Journal of Natural Gas Science & Engineering,2014,19(7):32-45.