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《Natural Gas Industry》 2009-10
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Pinch analysis on the heat exchanger network of the triethylene glycol(TEG) dehydration unit in gas purification plants

LI Qi1,JI Zhong-li1,ZHANG De-yuan2,ZHAN Zhao1(1.School of Mechanical and Electrical Engineering,China University of Petroleum,Beijing 102249,China;2.Natural Gas Research Institute,PetroChina Southwest Oil & Gasfield Company,Chengdu 610213,China)  
The natural gas triethylene glycol(TEG) dehydration process is most widely used in current natural gas purification plants all over the world.In order to reduce the energy consumption,we used the pinch analysis for the heat exchanger network of a TEG dehydration unit,adopted the software HYSYS to simulate the TEG dehydration process,from which the properties of hot and cold streams involved in the heat exchange were obtained.Then we applied the temperature-enthalpy diagram,the grid diagram and the questionnaire method of pinch analysis technology to analyze the heat exchanger network of the TEG dehydration,and found out the "bottleneck" of this unit-a big temperature difference between hot and cold streams,which stopped the further recovery of heat.Through comprehensive analysis on the temperature-enthalpy diagram and the TEG regeneration process,we found that if the temperature of rich TEG solution after heat exchanger was raised,the heat transfer temperature difference would reduce and the heat recovery would increase.In contrast to the data from the HYSYS simulation before and after optimization of the TEG dehydration process,we discovered that the heating load of the TEG regenerator reduces by 39.40% in the optimized TEG dehydration unit,and the cooling load of poor TEG solution reduces 156.20 kW after being computationally optimized by the questionnaire method.
【Key Words】: natural gas purification TEG dehydration pinch analysis heat exchanger network HYSYS simulation energy consumption decrease
【CateGory Index】: TE644
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【Citations】
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1 Wang Le, Jia Limin, Fu Menggui, Song Haichao (Henan Zhongyuan Green Energy Hi-Tech Ltd.).;TECHNICAL REFORM OF GAS DEHYDRATION SYSTEM[J];Natural Gas Industry;2005-08
【Co-citations】
Chinese Journal Full-text Database 2 Hits
1 DONG Jia-qing, ZHANG Yun-xiao (LNG Manufacturer of Green Energy High Technology Co., Ltd., SINOPEC Zhongyuan Oilfield Company).;REFORM ON DE-BENZENE TECHNOLOGY IN LNG MANUFACTURERS[J];Natural Gas Industry;2007-06
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