Abstract:

A scheme for refrigerant direct-contact seawater desalination utilizing LNG cold energy is presented in this paper.On one hand，it can achieve seawater crystallization to produce freshwater continuously.On the other hand，because of making full use of LNG cold energy，the system could avoid the need for electricity-driving refrigerator and save energy，satisfying the requirements of energy-saving and ejection-decreasing.The process of seawater desalination system，the choice of middle refrigerant and the determination of main process parameters are discussed.The size of the crystallizer is estimated with volume heat transfer coefficient and evaporation height.The inlet and outlet parameters of the pre-cooling heat exchanger are also discussed.The system process simulation results show that this kind of seawater desalination process is an efficient and feasible one.

摘要：

提出了一种利用LNG冷能进行冷媒直接接触法海水淡化的具体方案，一方面，能够实现连续式海水结晶，从而使得海水能持续淡化;另一方面，充分利用了LNG冷能，避免了系统中电驱动制冷机的需要，从而节省了能耗，实现了节能减排的要求。讨论了海水淡化系统的流程、中间冷媒的选择、主要参数的确定等问题。参照相关体积传热系数和蒸发高度初步估算了试验样机中结晶器的大小，并且对预冷换热器进出口参数进行了求解。对系统相关流程进行了模拟，结果表明这种海水淡化方案是高效可行的。