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【关键词】 热工学; 间接冷冻法海水淡化; 中间冷媒; LNG冷能; 相变; 【英文论文关键词】 Thermal engineering Indirect freezing seawater desalination Middle refrigerant LNG cold energy Phase change; 【论文摘要】 淡水资源缺乏已成为全球性问题,海水淡化方法的研究也日益引起重视。液化天然气在气化时有大量冷能可以利用,考虑到冷冻法海水淡化需要大量冷能,可以把LNG的冷能和冷冻法海水淡化结合起来,形成利用LNG能冷的冷冻法海水淡化流程。本文以间接冷冻法为例,介绍了LNG冷能在海水淡化中的利用;并针对系统中冷媒是否相变而提出了无相变流程和有相变流程,通过HYSYS软件进行模拟,比较分析了各自的优缺点。结果说明无相变流程设备简单,控制方便,但冷媒质量流量大;有相变流程冷媒质量流量小,但流程、设备与控制均较复杂,气相部分体积流量较大,使得气态管路直径较大,相应的换热器尺寸也会更大。 【英文论文摘要】 Lack of freshwater resources has become a global problem, and desalination methods have been studied more and more. LNG will release a lot of cold energy during its vaporization process. Considering that freezing desalination systems needs much cold energy, they can be integrated with utilization of LNG cold energy. This paper studies indirect freezing seawater desalination with LNG cold energy utilization, and presents two cycle schemes in accordance with the state of middle refrigerant, that are non-phase