基于热管传热的盐溶液真空雾化闪蒸水分离实验研究

Experimental Study on Desalinationof Salt Solution by Vacuum Flashing with Low Grade Heat Source

基于利用低品位热源探求新的节能途径以降低海水淡化成本的目的,借用热管的高热流密度传热特性设计并搭建了盐溶液在真空条件下的雾化闪蒸水分离实验台,实验初步测试了影响水分离率的主要因素,分析了不同壁厚热管轴向的温度分布规律及传热性能。结果表明：喷雾特性、低品位热源温度等都是影响水分离率的重要因素;热管能迅速将热量传递给正处于闪蒸降温过程中的盐溶液液滴,即使在35~40℃的低品位热源驱动下,也可实现较高的水分离率;直径10 mm长450mm的热管导热功率最高可达150 W。

Here,we experimentally addressedthe desalination of salt solutionby vacuum flashing with the lab-built test-bench,consisting of vacuum system,low-grade heat-source,thermal conductive pipes,flashing atomization,water-cooling and control units.The influence of the realistic situation,including but not limited to the geometry,thermal conductivity and axial temperature distributions of heat pipes,spraying performance,temperatures of heat source and cooling water,on the separation rate was investigated.The preliminary results show that depending on the source temperature and spraying characteristics,a fairly high separation rate can be obtained with a 35℃ ~ 40℃ heat source,and that the heat pipes are capable of rapidly transporting heat to the droplets cooled by vacuum flashing.To be specific,the highest thermal power of the pipe,450 mm long and 10 mm in diameter,was estimated to be 150 W.