This work presents an improved evaporator design of the Multi Effect Distillation (MED) to minimize the thermal losses and footprint of the evaporator. An advanced modular MED pilot plant has been installed with a nominal capacity of 25 m³/day to validate the concept under a seawater salinity of 57,500 ppm (Dukhan Coast, West of Qatar), at the top brine temperature of 65 °C. Both the pilot testing and the simulation results confirm the features of the novel design of the MED. By implementing this invention's design, the heat transfer area has been decreased and accordingly, the capital cost of the evaporator is reduced by 20%. The tube arrangement with new vapor route allows the removal of the traditional demister, which accordingly reduces the footprint of the desalination plant by 65%. The sieve tray for spraying the seawater over the rectangular and inline tube bundle creates a uniform wettability. The improved design also discloses the utilization of an online vent water-ejector, for vent out of the non-condensable gases (NCGs). The novel evaporator design based low temperature MED technology, shows a potential solution for the industrial applications of high salinity byproduct and solar desalination.

这项工作提出了多效蒸馏 (MED) 的改进蒸发器设计，以最大限度地减少蒸发器的热损失和占地面积。已安装标称容量为 25 m ³的先进模块化 MED 中试设备/天以在海水盐度为 57,500 ppm（卡塔尔西部杜罕海岸）、最高盐水温度 65 °C 下验证该概念。试点测试和模拟结果都证实了 MED 新颖设计的特点。通过实施本发明的设计，传热面积已经减小，因此蒸发器的资本成本降低了20%。带有新蒸汽路径的管道布置允许去除传统的除雾器，从而将海水淡化厂的占地面积减少 65%。用于将海水喷洒在矩形和直列管束上的筛盘可产生均匀的润湿性。改进的设计还公开了使用在线排放水喷射器来排放不可冷凝气体 (NCG)。