摘要：

随着我国沿海液化天然气（LNG）接收站的迅速发展，LNG冷能有望成为冷冻法海水淡化的低成本冷源。在此前提下，研究了人工海冰在不同融化率下的重力脱盐效果，结果表明，当融化率达到79.53%时，Cl^-、TDS、总硬度这3项指标可达到饮用水标准。当融化率为39.81%时，将冷冻-重力脱盐产水作为反渗透系统进水的运行模式，相较单纯冷冻-重力脱盐模式，饮用水产水率由20.47%上升到45.1%；相较直接将原海水进行反渗透处理，水泵吨水能耗从3.39 kW·h下降到0.87 kW·h。

关键词: 冷冻法, 重力脱盐, 反渗透, 液化天然气

Abstract:

With the rapid development of Liquefied Natural Gas(LNG) receiving stations along the coastal area of China, LNG cold energy is expected to become the low-cost cold source for seawater freezing desalination method. On this premise, the gravity-induced desalination effect of artificial sea ice was studied under different melted proportions. The experimental results showed that when the melted proportion reached 79.53%, the contents of Cl^-, TDS and total hardness in water product could meet the requirement of the drinking water standard. In the combined freezing, gravity-induced and reverse osmosis desalination(FGROD) method, the water produced is used to freeze and the gravity-induced desalination(FGD) method is used as feed water of the reverse osmosis(RO) process. Thus, the fresh water yield rate can be increased greatly. For example, the drinkable water yield rate can be increased from 20.47% to 45.1%, when FGROD method with 39.81% melted proportion rather than FGD was employed to deal with seawater. Using FGROD method, the energy consumption of the pump can be decreased from 3.39 kW·h to 0.87 kW·h, comparing with using RO method.

Key words: freezing desalination, gravity-induced desalination, reverse osmosis, LNG

中图分类号: 

• P747