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Seawater Desalination Based on a Bubbling and Vacuum-Enhanced Direct Contact Membrane Distillation

文献类型： 外文期刊

作者： Cao, Guangfu 1 ; Ma, Qingfen 1 ; Li, Jingru 1 ; Wang, Shenghui 1 ; Wang, Chengpeng 2 ; Lu, Hui 3 ; Zheng, Yun 1 ;

作者机构： 1.Hainan Univ, Coll Mech & Elect Engn, Haikou 570228, Hainan, Peoples R China

2.MNR, Inst Seawater Desalinat & Multipurpose Utilizat, 55 Hanghai Rd, Tianjin 300192, Peoples R China

3.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Haikou 571101, Hainan, Peoples R China

期刊名称：INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING （ 影响因子：2.257； 五年影响因子：2.398 ）

ISSN： 1687-806X

年卷期： 2021 年 2021 卷

页码：

收录情况： SCI

摘要： A Bubbling and Vacuum-enhanced direct contact membrane distillation (BVDCMD) is proposed to improve the water production rate of the direct contact membrane distillation (DCMD-)based seawater desalination process. Its heat and mass transfer mechanism are theoretically analyzed, and a CFD model is established, which is verified by the published data. Four types of the noncondensable gas, "O-2," "air," "N-2," and "H-2," are adopted as the bubbling gas, and their process enhancements under different pressure of permeate side, temperature, and NaCl concentration of feed side and flow velocities are investigated. The results show that the permeate flux increased remarkably with the decrease in the viscosity of the bubbling gas, and hence, "H-2" is the best option for the bubbling gas, with the permeate flux being enhanced by 144.11% and the effective heat consumption being increased by 20.81% on average. The effective water production rate of BVDCMD is predicted to be 42.38% more than that of DCMD, proving its feasibility in the seawater desalination.

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