高含氮天然气膨胀制冷液化工艺节能分析  

Energy-saving analysis on expanding refrigeration process of high-N_2 natural gas

作　　者：冉田诗璐 诸林[1] 

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《现代化工》2014年第6期142-145,共4页Modern Chemical Industry

摘　　要：在利用HYSYS对某高含氮天然气膨胀制冷液化工艺进行模拟的基础上,应用有效能分析法考察了该工艺过程中有效能损失的数量与分布,并提出节能的措施。研究表明,有效能损失主要集中在膨胀机、压缩机与冷箱,分别占总有效能损失的51.30%、35.61%和8.13%;适当降低制冷剂中N2摩尔分数、提高低压制冷剂温度与压力、减少高压制冷剂流量,可以达到改善膨胀机和压缩机能量利用效率的目的;回收储罐蒸发气(boil oil gas,BOG)的冷量用以预冷原料气及适当减少冷箱内换热温差、增大换热面积,能够有效降低冷箱的有效能损失。An expanding refrigeration process simulation of the natural gas with high content of nitrogen is conducted by HYSYS.The amount and distribution of exergy loss for high-N2 natural gas in this process are investigated.The energy-saving strategy is also put forward.The results show that the exergy loss is mainly in the expander,compressor and heat exchanger,and account for 51.30％,35.61％ and 8.13％ of the total exergy losses,respectively.Decreasing the N2 content in the refrigerant properly,improving the pressure and temperature of the low pressure refrigerant and reducing the flow of the high pressure refrigerant achieve the improved energy utilization efficiency of expander and compressor.For the heat exchangers,decreasing heat transfer temperature difference,enlarging heat transfer area and recycling the BOG cooling energy can reduce exergy losses of the heat exchangers effectively.

关 键 词：高含氮天然气 膨胀制冷 液化 节能 有效能损失 

分 类 号：TE08[石油与天然气工程]