Continuous solar desalination based on restricted salt crystallization zone
Continuous solar desalination based on restricted salt crystallization zone
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DOI：
10.1016/j.desal.2020.114911
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发表时间：
2021-04
期刊：
影响因子：
9.9
通讯作者：
Changkun Liu;Yeping Peng;Xinzhen Zhao
中科院分区：
文献类型：
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作者：
Changkun Liu;Yeping Peng;Xinzhen Zhao
盐结晶是制约太阳能海水淡化长期应用的关键因素。为了控制太阳能蒸发过程中的盐析晶现象，本研究成功地研制了一种新型的横向流道松散的太阳能蒸发器。所制备的蒸发器的蒸发率和太阳能蒸发效率分别提高到1.32 kg/m2.h和88%。长期使用高浓度盐水进行蒸发处理，蒸发速率保持在1.2 kg/m2h以上，盐析晶区局限于光热层边缘。再溶的聚乙二醇组成为氧化石墨烯(GO)光热层中盐溶液横向输送的光滑通道，由于太阳蒸发过程中向上输送的阻力，浓缩的盐溶液更有可能横向输送到GO层的边缘。由于结晶盐的形成区域仅限于光热层的边缘，因此保持了光热层的有效蒸发面积，从而保证了太阳能连续海水淡化。
Salt crystallization is a key factor restricting the long-term application of solar desalination. In this study, a new type of solar evaporator with loose lateral channels was successfully prepared to control the salt crystallization phenomenon during solar evaporation process. The evaporation rate and solar evaporation efficiency of the prepared evaporator increased to 1.32 kg/m2h and 88%, respectively. The evaporation rate was maintained above 1.2 kg/m2h when the high concentration brine was used for evaporation treatment for a long time, and the salt crystallization zone was limited to the edge of the photothermal layer. The re-dissolved polyethylene glycol (PEG) constructed the smooth lateral channels for salt solution transport in the graphene oxide (GO) photothermal layer, and the concentrated salt solution was more likely to be transported laterally to the edge of GO layer due to the resistance of upward transport during solar evaporation. Because the formation area of crystalline salt was limited to the edge of the photothermal layer, the effective evaporation area of the photothermal layer was maintained, thereby ensuring continuous solar desalination.