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Flash recovery system analysis and flashing tank optimization in desalination plants

机译：海水淡化厂闪蒸回收系统分析和闪蒸罐优化

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Highlights•The model of MED flash system was established for flash analysis.•Flashing account for 6.0% of the total water production of MED was obtained.•Factors related to the flash efficiency were simulated and analyzed.•Results highlight the importance of structure improvement to flash efficiency.AbstractThis study established and calculated the flash system model of 7-effects low-temperature multi-effect distillation (LT-MED) system with an installed capacity of 4500 m3/d. The calculation results showed that the brine and distillate flashing accounts for 6.0% of the total water production, which indicate the significant effect of such flashing heat recovery system. Furthermore, a three-dimensional simulation of water–vapor flow in the flashing tank of a LT-MED plant was conducted by using a FLUENT CFD code coupled with a user-defined function. The factors related to the flash efficiency, including flashing tank diameter, length, and internal platform height, were simulated and analyzed. Finally, an improved scheme for setting a platform inside the flashing tank was proposed. The simulation results revealed that the improved scheme ensures the sufficient flash of water inside the tank. These finds of the present study can serve as a reliable reference for the design of flashing tank in LT-MED plant.
机译： 突出显示 • 已建立MED闪存系统的模型以进行闪存分析。 < ce：list-item id =“ o0010”> • 冲洗水占MED水总产量的6.0％ • 与闪光效率相关的因素得到了仿真和分析。 •< / ce：label> 结果突出显示了结构改进对闪存效率的重要性。 摘要 该研究建立并计算了装机容量为4500 m 3 / d。计算结果表明，盐水和馏出物的闪蒸占总产水量的6.0％，表明该闪蒸热回收系统的显着效果。此外，通过使用FLUENT CFD代码和用户定义的功能，对LT-MED工厂闪蒸罐中的水蒸气流进行了三维模拟。模拟和分析了与闪蒸效率有关的因素，包括闪蒸罐直径，长度和内部平台高度。最后，提出了一种在闪蒸罐内设置平台的改进方案。仿真结果表明，改进的方案可以确保水箱内有足够的水闪蒸。本研究结果可为LT-MED厂闪蒸罐的设计提供可靠的参考。

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