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.