低温混合工质循环多股流换热器性能分析  

Performance analysis of multi-stream heat exchanger in low temperature mixed-refrigerant-cycle

作　　者：张镨[1] 鹿来运[1] 郭开华[1] 

机构地区：[1]中山大学工学院,广州510006

出　　处：《低温工程》2012年第5期46-50,共5页Cryogenics

基　　金：中山大学-BP液化天然气中心资助项目(编号:99103-9390001);广东省教育厅液化天然气与低温技术重点实验室资助项目(编号:39000-3211101)

摘　　要：基于混合工质低温气体液化装置的一个稳定生产液化空气的实验工况,得到多股流换热器纵向温度分布及分段热负荷分布,并分析其出现的原因;核算了板翅式多股流换热器的漏冷量,得到因轴向导热产生的漏冷量为258.1 W,因热辐射、对流传热等漏向大气环境的冷量约386.6 W,多股流换热器存在着严重漏冷现象,大大的影响了系统效率;在对实验系统中各主要换热部件的热负荷核算的基础上,分析了增大预冷负荷将对多股流换热器工作性能及系统热力效率的影响。The performance of multi-stream heat exchanger was studied in low temperature, based on the steady-state experiment of liquefied air production using the mixed-refrigerant gas liquefier. The vertical temperature and heat load profile of the multi-stream heat exchanger were obtained and discussed. Severe cold leak phenomenon happens on the multi-stream plate fin heat exchanger. Axial cold leak caused by heat conduction in the heat exchanger is 258.1W, and the cold leak due to heat radiation and convection in the atmosphere is about 386.6 W, by which system efficiency is decreased a lot. At last,on the basis of analy- sis of the heat load of each component device of the experimental system, the performance of the multi- stream heat exchanger and thermodynamic efficiency of the system were discussed when the pre-cool heat load was increased.

关 键 词：多股流换热器 混合工质 低温漏冷 热负荷匹配 

分 类 号：TB651[一般工业技术—制冷工程]