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首页> 外文期刊>Journal of Membrane Science >Ion-exchange membrane electrodialytic salt production using brine discharged from a reverse osmosis seawater desalination plant
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Ion-exchange membrane electrodialytic salt production using brine discharged from a reverse osmosis seawater desalination plant

机译：使用反渗透海水淡化厂排放的盐水生产离子交换膜电渗析盐

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摘要

Operating parameters of an ion-exchange membrane electrodialytic salt manufacturing plant (NaCl production capacity: 200,0001 per year) using brine discharged from a reverse osmosis (RO) seawater desalination plant are discussed. The results were compared with the data obtained from a salt manufacturing plant using seawater. The specifications of the electrodialyzer are: the thickness of the desalting cell, 0.05 cm; the flow-pass length in a desalting cell, 2 m; effective membrane area, 2 m~2; overall osmotic coefficient of a membrane pair, 30 cm~4/(eq. h); and solution velocity at the inlets of desalting cells, 5 cm/s. The electrolyte concentration at the inlets of desalting cells was set at 1.5 eq./dm~3, which is consistent with the electrolyte concentration of brine discharged from a reverse osmosis seawater desalination plant. The energy consumed in the salt manufacturing process was assumed to be supplied by a simultaneous heat-generating electric power unit using a back-pressure turbine. The number of evaporators (evaporation pans) was selected to minimize the electric power shortfall of the salt manufacturing process but to be larger than zero. The electric power shortage was assumed to be made up by purchased electric power, which is generated by a condensing turbine. The energy consumption in a salt manufacturing process was obtained by adding the generation energy in the back-pressure turbine, the evaporation energy in the No. 1 evaporator in multiple-effect evaporators, the condensing energy in the heater in the No. 1 evaporator and purchased energy. The energy consumption in a salt manufacturing process using the brine discharged from a reverse osmosis seawater desalinating plant was 80% of the energy consumption in the process using seawater. The optimum current density at which the energy consumption is minimized was 3 A/dm~2 for both electrodialyses of brine discharged from the reverse osmosis desalination plant and of seawater.
机译：讨论了使用从反渗透（RO）海水淡化厂排放的盐水的离子交换膜电渗析盐制造厂（每年的NaCl生产能力：200,0001）的运行参数。将结果与使用海水制盐厂获得的数据进行了比较。电渗析仪的规格为：脱盐槽的厚度为0.05厘米；脱盐室的通流长度为2 m；有效膜面积2 m〜2；膜对的总渗透系数为30 cm〜4 /（eq。h）;脱盐池入口处的溶液速度为5 cm / s。脱盐池入口处的电解质浓度设置为1.5 eq./dm~3，与反渗透海水淡化厂排放的盐水的电解质浓度一致。盐制造过程中消耗的能量被假定为通过使用背压式涡轮机的同时发热的电力装置提供的。选择蒸发器（蒸发盘）的数量以最大程度地减少制盐过程中的电力短缺，但应大于零。假定电力短缺是由冷凝式涡轮机产生的购买的电力弥补的。盐制造过程中的能耗是通过将背压式涡轮机的发电能量，多效蒸发器中的1号蒸发器中的蒸发能量，1号蒸发器中的加热器中的冷凝能量和购买能源。使用从反渗透海水淡化厂排放的盐水制盐的过程中的能耗为使用海水的过程中能耗的80％。从反渗透海水淡化厂排放的盐水和海水都进行电渗析，使能量消耗最小的最佳电流密度为3 A / dm〜2。

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