论文部分内容阅读
降膜蒸发是海水淡化的一项主要技术。传热管是降膜蒸发器的核心部件。螺旋槽管是一种应用广泛的高效强化传热管,但在海水淡化中应用较少,缺乏相关的实验数据。为论证螺旋槽管用于海水淡化的可行性,首先在水平管降膜蒸发传热实验平台上,以自来水为工质,研究了螺旋槽管的强化传热特性,分析了喷淋密度、热通量、传热温差和蒸发温度对其传热的影响;然后借助低温多效蒸馏(LT-MED)海水淡化中试装置,在海水淡化实际工况下,运行测试180 d,研究了螺旋槽管的结垢特性。在本实验中,螺旋槽管传热系数较光管平均提高35%左右;其结垢厚度小于光管,结垢疏松多孔,易于清除。
Falling film evaporation is one of the major technologies for seawater desalination. Heat transfer tubes are the core components of falling film evaporators. Spiral groove tube is a widely used highly efficient heat transfer tube, but less used in desalination, the lack of relevant experimental data. In order to demonstrate the feasibility of using helical fluted tube for seawater desalination, the enhanced heat transfer characteristics of the spiral fluted tube were studied on the experiment platform of horizontal tube falling film evaporation heat transfer with tap water as the working fluid. The effects of spray density, Volume, heat transfer temperature difference and evaporation temperature on the heat transfer of the desalinated seawater desalination unit. Then the low temperature multi-effect distillation (LT-MED) desalination pilot plant was used to run the test for 180 days under seawater desalination. Fouling characteristics. In this experiment, the spiral tube heat transfer coefficient than the average increase of about 35% of the light tube; its fouling thickness is less than the light pipe, fouling loose porous, easy to remove.