A new ZLD process for the salinity range beyond 70,000 ppm has been developed to reduce the volume of brine. We use the fluidised bed heat exchanger to cool down the brine to nucleate ice crystals and separate freshwater from the concentrated brine. Particle and wall collision and pressure fronts induced by particle-particle collision prevent ice formation in the internal surface of the heat exchanger. The concept of transition temperature difference, which is the limit for ice scaling, is used for our process simulation. We use the growth tank and wash column as part of the new process to increase the crystal size and wash the ice crystals efficiently. The new process benefits from the self-cleaning effect, and there is an improvement in the fluidised bed heat transfer coefficient. The process can be scaled up to increase brine mass flow rate using a tube bundle or achieve high concentrations by adding more fluidised bed heat exchangers.

已开发出一种用于盐度范围超过 70,000 ppm 的新 ZLD 工艺，以减少盐水的体积。我们使用流化床热交换器冷却盐水，使冰晶成核，并将淡水与浓缩盐水分离。颗粒与壁面碰撞以及颗粒-颗粒碰撞引起的压力前沿可防止换热器内表面结冰。转变温度差的概念是冰结垢的极限，用于我们的过程模拟。我们使用生长槽和洗涤柱作为新工艺的一部分，以增加晶体尺寸并有效地洗涤冰晶。新工艺受益于自清洁效果，流化床传热系数有所提高。