基于水冷压缩式制冷循环的CO2水合物海水淡化实验研究

Experimental Research on CO2 Hydrate Desalination Based on Water-Cooled Compression Refrigeration Cycle

提出一种基于水冷压缩式制冷循环的CO2水合物海水淡化方法,并进行了CO2水合物海水淡化实验,实验选取4种不同的初始海水盐度(10‰、20‰、30‰、40‰),控制其温度为20℃,在4种不同的充注压力(3.6 MPa、3.8 MPa、4.0 MPa、4.2 MPa)下进行实验,考察了初始海水盐度和充注压力对海水淡化效果的影响。结果表明,充注压力越高,初始海水盐度越低,水合反应预冷时间越短。在充注压力为4.2 MPa、初始海水盐度为10‰时,预冷时间最短(15.01 min),淡化水产量最高(3172.34 g),淡化速率最快(211.35 g/min),淡化水盐度最低(4.49‰),盐去除率为5.11‰。在充注压力为4.2 MPa、初始海水盐度为30‰时,淡化水产量为2868.66 g,淡化速率为165.63 g/min,淡化水盐度为6.49‰,盐去除率最高,为8.37‰。充注压力越高,初始海水盐度越低,则淡化水能耗越低。

A hydrate seawater desalination method based on water-cooled refrigeration cycle was proposed and the hydrate seawater desalination experiment was carried out.Four different initial seawater salinities(10‰,20‰,30‰,40‰)were chosen and were experimented at controlled temperature of 20°C and 4 different filling pressures(3.6 MPa,3.8 MPa,4.0 MPa,4.2 MPa),the effects of the initial seawater salinity and charging pressure on the desalination effect were studied.Results showed that the higher the charging pressure,the lower the initial seawater salinity and the shorter the pre-cooling time of the hydration reaction.When the charging pressure was 4.2 MPa and the initial seawater salinity was 10‰,the pre-cooling time(15.01 min)was the shortest,the desalination water output was the highest(3172.34 g),the desalination rate was the fastest(211.35 g/min),the desalination water salinity was the lowest(4.49‰),the salt removal rate was 55.11‰.When the charging pressure was 4.2 MPa and the initial seawater salinity was 30‰,the desalination water output was 2868.66 g,the desalination rate was 165.63 g/min,the desalination water salinity was 6.49‰,and the salt removal rate was the highest(78.37‰).The higher the charging pressure and the lower the initial seawater salinity was,the lower the energy consumption of desalinated water was.