海水-混合冷剂换热器热力设计研究

摘要

混合冷剂与海水-混合冷剂换热器现场测量数据表明,混合冷剂在壳程冷凝过程包含入口至相分离点的整体冷凝、部分冷凝、出口处的直接接触冷却.以Aspen Hysys软件建立海水混合冷剂换热器冷凝过程的物理模型,确定整体冷凝与部分冷凝分界点温度.采用Bell-Ghaly法进行混合冷剂冷凝膜传热系数计算,将计算结果与原设计进行对比,有效传热面积和有效长度偏差为0.16％,验证了物理模型和计算方法的有效性,为海水混合冷剂换热器热力设计提供借鉴.%The field measurement data of seawater-mixed refrigerant heat exchanger showed condensation process of mixed refrigerant comprised the integral condensation from the inlet to phase separation,differential condensation and the direct contact cooling at the outlet in the shell.To investigate the separation point between integral condensation and differential condensation,a physical model of the condensation process was established in Aspen Hysys.Condensing heat transfer coefficient of mixed refrigerant was calculated using the Bell-Ghaly method.The results compared with the original design showed that the deviation of the effective heat transfer area and the effective length were both only 0.16％.The validity of the physical model and calculation method is verified,which can provide reference for the thermodynamic design of seawater mixed refrigerant heat exchanger.