混合工质低温系统启动特性动态模拟研究  

Study on dynamic simulation of start-up characteristics of mixed-refrigerant low temperature system

作　　者：张镨[1] 郭开华[1] 邓文源[1] 邓励强 

机构地区：[1]中山大学工学院,广州510006

出　　处：《低温与超导》2014年第9期4-9,共6页Cryogenics and Superconductivity

摘　　要：为保证混合工质循环低温气体液化系统的安全启动、快速降温、高效运行,系统启动的动态特性的研究和设计至关重要。基于气液两相的容积节点原理建立了混合工质低温循环系统动态模拟方法,并成功与实际混合工质循环气体液化系统的动态实验数据相验证。重点研究了系统中的压缩机特性及多股流换热器中高沸点工质屯液相变对系统启动过程的影响规律。研究结果表明：启动过程动态特性在关键节点压力、温度参数上与实验数据吻合较好。通过对压缩机的吸气腔容积和系统屯液量对系统启动特性影响进行参量研究,得出系统压缩机吸排气腔容积比在3~4时,可避免高压超压及低压震荡;系统中工质屯液量约为0.36 kg/（kW压缩机排量）时,利于系统启动过程的快速降温及可靠运行。The start - up characteristics are crucial for the design and running of Mixed - Refrigerant （MR） low temperature system. Based on the fundamental principle of two phase volume node, this article established dynamic simulation method for MR low temperature system. The simulation results were validated by the experimental data successfully. Tile rule of the system＇ s start - up characteristics influenced by the characteristics of compressor and evaporation of MR liquid hold - up in MSHE were highlighted. The simulation results revealed that the dynamic characteristics of pressure and temperature at key parameter points were in good accordance with experimental data. Through the parameter studies of the compressor inlet drum volume and MR liq- uid hold - up mass, the simulated start - up characteristics result indicates that the system＇ s pressure can be stable and safe when the compressor inlet drum volume is 3 - 4 times of its outlet drum, and when the liquid hold - up mass is around 0.36 kg/ kW, the temperature decreasing rate and working condition of the system can be promoted effectively during start - up process.

关 键 词：动态模拟 启动特性 混合工质 压缩机模型 工质屯液 

分 类 号：TB64[一般工业技术—制冷工程]