三倍浓缩低温多效海水淡化装置的工艺设计及验证

Process design and verification of the triple-concentrated,low temperature and multiple-effect desalination system

对三倍浓缩低温多效海水淡化技术的工艺流程、参数及运行效果进行了介绍。充分考虑高浓缩倍率的结垢风险,设计采用海水顺流流程,对蒸发器效数、效间传热温差、海水喷淋密度等进行了优化,并将一套二倍浓缩1 000 t/d低温多效海水淡化装置进行技术改造,对三倍浓缩工艺进行了试验验证,测试了蒸发器的抗结垢性能和耐腐蚀性能。运行结果显示,浓缩比、造水比等各项性能指标达到预期目标。

The process flow, parameters and operating results of triple-concentrated, low temperature, multiple ef- fect desalination （LTMED） technology is introduced. By fully taking the scaling risk of highly concentrated multi- plying ratio into consideration, the seawater downstream flow has been used, the parameters such as the number of effect of evaporators, heat transfer temperature difference between effects, spray density of seawater, etc. opti- mized, and a set of double-concentrated 1 000 t/d LTMED device modified technically, the triple-concentrated process tested and verified, and the anti-scaling and corrosion-resistance performances of the evaporator tested. The running results show that all the performance indexes, including concentration ratio and water producing ratio achieve the expected objective.