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Analysis of temperature effects on the specific energy consumption in reverse osmosis desalination processes
Desalination ( IF 9.9 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.desal.2019.114213
C.P. Koutsou , E. Kritikos , A.J. Karabelas , M. Kostoglou

Abstract Specific Energy Consumption (SEC) is key parameter involved in optimizing design and operation of RO-desalination plants, used for treating various feed-waters. This study deals with feed-water temperature Tf effects on the performance of a typical RO unit (operating in constant recovery mode), that includes an energy recovery device (ERD), focusing on SEC for brackish and sea-water desalination. Account is taken of temperature-effects on physico-chemical water-properties and membrane performance-parameters, that enable reliable determination of itemized contributions to SEC; the latter include energy losses in mechanical devices (pumps and ERD) and in the RO process, mainly due to species separation and fluid-friction through membranes and narrow flow-channels. In general, within a Tf range ~15 to 40 °C, increased feed-water temperature results in SEC reduction in desalinating low salinity waters. However, for high salinities as in sea-water, the significantly increasing osmotic pressure (with Tf) tends to neutralize other positive effects, thus leading to a minimum SEC at ~30 °C for typical membrane-module parameter-values. Furthermore, increased Tf in desalination of both low- and high-salinity waters tends to negatively impact on membrane salt rejection and scaling, which should be considered in optimization studies. The methodology adopted in this work would be useful in such studies.

中文翻译:

反渗透海水淡化过程中温度对单位能耗的影响分析

摘要 比能耗 (SEC) 是涉及 RO 海水淡化厂优化设计和运行的关键参数,用于处理各种给水。本研究涉及给水温度 Tf 对典型 RO 装置(在恒定回收模式下运行)性能的影响,该装置包括能量回收装置 (ERD),重点关注用于苦咸水和海水淡化的 SEC。考虑了温度对物理化学水特性和膜性能参数的影响,从而能够可靠地确定对 SEC 的逐项贡献;后者包括机械设备(泵和 ERD)和 RO 过程中的能量损失,主要是由于物质分离和通过膜和窄流道的流体摩擦。通常,在 Tf 范围 ~15 至 40 °C 内,给水温度升高导致脱盐低盐度水的 SEC 减少。然而,对于海水中的高盐度,显着增加的渗透压(与 Tf)往往会抵消其他积极影响,从而导致典型的膜组件参数值在 ~30 °C 时的最低 SEC。此外,在低盐度和高盐度海水淡化中增加 Tf 往往会对膜脱盐和结垢产生负面影响,这应该在优化研究中加以考虑。这项工作中采用的方法将在此类研究中有用。因此,对于典型的膜组件参数值,在 ~30 °C 时的 SEC 最低。此外,在低盐度和高盐度海水淡化中增加 Tf 往往会对膜脱盐和结垢产生负面影响,这应该在优化研究中加以考虑。这项工作中采用的方法将在此类研究中有用。因此,对于典型的膜组件参数值,在 ~30 °C 时的 SEC 最低。此外,在低盐度和高盐度海水淡化中增加 Tf 往往会对膜脱盐和结垢产生负面影响,这应该在优化研究中加以考虑。这项工作中采用的方法将在此类研究中有用。
更新日期:2020-02-01
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