Scale formation of carbonates and sulphates is one of the most well-known types of crystallization fouling in heat exchangers. Tackling crystallization fouling in Once-Through Multistage Flash Desalination (MSF-OT) is one of the most challenging tasks in the desalination industry. In this paper, a fouling model is developed and then incorporated into a MSF model to investigate the fouling behaviour under variable seawater temperature. The proposed dynamic model investigates the crystallization of calcium carbonate and magnesium hydroxide at the inside tube surface areas by considering the attachment and removal mechanisms. The results show that the fouling rate is higher at high constant seawater temperature. Overall, the fouling rate is lower at the seasonal variation of the seawater temperature, resulting in a higher performance ratio (PR). The results also show that although the brine heater duty increases in winter due to low seawater temperature, the drop of fouling rate in cold months may save some energy.

碳酸盐和硫酸盐的结垢是换热器中最著名的结晶结垢类型之一。解决直通式多级闪蒸海水淡化 (MSF-OT) 中的结晶污垢是海水淡化行业最具挑战性的任务之一。在本文中，开发了污垢模型，然后将其合并到 MSF 模型中，以研究可变海水温度下的污垢行为。所提出的动态模型通过考虑附着和去除机制研究了碳酸钙和氢氧化镁在管内表面区域的结晶。结果表明，在较高的恒定海水温度下，污染率较高。总体而言，随着海水温度的季节性变化，污染率较低，从而导致较高的性能比（PR）。