混合碳氢制冷剂在螺旋折流板管壳式冷凝器壳侧冷凝特性的实验研究

Experimental Investigation on Mixed Hydrocarbon Refrigerant Flow Condensation Characteristics in Shell Side of Helically Baffled Shell-and-tube Condenser

螺旋折流板管壳式冷凝器在液化天然气工厂中应用广泛,了解乙烷/丙烷混合制冷剂在管壳式冷凝器壳侧的冷凝换热特性有助于优化换热器设计。本文对乙烷/丙烷混合制冷剂在螺旋折流板管壳式换热器壳侧的冷凝换热特性进行了实验研究。实验结果表明:壳侧换热系数随干度增加先增大后减小,在0.8~0.9附近达到峰值;换热系数随热流密度的增加而增大。新开发的换热关联式对乙烷/丙烷混合制冷剂在螺旋折流板管壳式冷凝器流动冷凝换热系数预测偏差在25%以内。

The helically baffled shell-and-tube condensers are widely used in liquefied natural gas（LNG） plants. Understanding the condensation heat transfer characteristics of ethane/propane mixture refrigerant in the shell side of helically baffled shell-and-tube condenser can contribute to the optimal design of heat exchanger. In the present study, the condensation heat transfer characteristics of it were experimentally investigated. The results show that, as the vapor quality increases, the heat transfer coefficient initially increases and then decreases, representing a maximum at vapor quality of 0.8~0.9; as the heat flux increases, the heat transfer coefficient increases. A new heat transfer coefficient correlation for the mixed hydrocarbon refrigerant flow condensation in shell side of helically baffled shell-and-tube condenser is developed with deviation of ±25%.