太阳能中温闪蒸海水淡化系统产水性能研究

为提高系统产水性能并降低内部结垢,提出一种由非跟踪复合抛物面聚光器加热导热油至100 ℃以上作为供能热源,采用喷雾辅助闪蒸的海水淡化系统。实验研究实际天气中,不同太阳辐照度下进水口温度、进水流量对系统产淡水性能的影响。采用密封压力桶可将进水口温度升至沸点以上,最高可达123 ℃。太阳辐照度波动较大时,进水口温度保持稳定,系统可稳定运行。进水口温度对产水速率影响显著,平均进水口温度从100 ℃升至120 ℃时,产水速率提高47.61%。当进水流量为50 kg/h,压力维持在0.045 MPa时,系统产水速率最大,日累计淡水产量可达11.14 kg/（d·m²）,小时效率为81.45%,单级生产率为9.15%。

FRESH WATER PRODUCTION PERFORMANCE INVESTIGATION ON SOLAR MEDIUM TEMPERATURE FLASH EVAPORATION DESALINATION SYSTEM

In order to improve the water production performance and reduce the internal fouling, a flash evaporation desalination system with a non-tracking parabolic concentrator to heat the heat transfer oil to over 100 ℃ as an energy supply source and spray assisted flash was developed. The influences of water inlet temperature and flow rate on the fresh water production performance under different solar irradiance were experimentally explored in actual weather. The water inlet temperature can be enhanced above the boiling point （up to 123 ℃） by employing the sealed tank. In experiments, when the solar irradiance fluctuates greatly, the water inlet temperature remains stable and the system can operate stably. The water inlet temperature has a significant influence on the water production. When the average water inlet temperature increases from 100 ℃ to 120 ℃, the water production rate increases by 47.61%. When the water inlet flow rate is 50 kg/h and the pressure is 0.045 MPa, the system has the largest water production rate. The daily cumulative fresh water production reach 11.14 kg/（d·m²）, the hourly efficiency is 81.45%, and the single-stage productivity is 9.15%.