Heat accumulating type humidification and dehumidification solar seawater desalination system and technological method thereof

Abstract

The invention discloses a heat accumulating type humidification and dehumidification solar seawater desalination system and a technological method thereof. A heat tube-vacuum tube type solar thermal collector is used for directly heating the air and the seawater in a bubbler; a porous bubbling discharge pipe is dipped into the seawater so as to enable the air to bubble and humidify adding in the seawater in a spraying way; a humidifier is simple in structure, and easy to processing, disassembly and descaling. The condensation latent heat of vapor is recovered by the lower part of a fin inorganic heat tube in a dehumidifier and is then transmitted to a phase-change material and the seawater; part of the heat is used for heating and humidifying the air above a seawater desalter by means of the seawater desalter so as to generate fresh water, and the other part of heat is stored in a solid-liquid form and is released out at night; therefore, the condensation latent heat utilization rate and the fresh water yield are higher. The phase-change material is used for storing heat, so that the temperature at a heat exchange cold end of the heat tube is constant, and the heat exchange effect is good. A power grid or an independent photovoltaic power generation system is used for supplying power for the seawater desalination system, so that the seawater desalination system is flexible in scale and wide in application range, and can be used for desalting the coastal and island seawater and desalting the bitter salt water in inland remote and border areas.

Description

technical field [0001] The invention relates to the technical field of solar seawater desalination, in particular to a thermal storage type humidification and dehumidification solar seawater desalination system and a process method. Background technique [0002] The humidification and dehumidification method is the method with the highest thermal efficiency among many solar desalination methods, and is suitable for small and medium-sized solar desalination devices. Humidification and dehumidification In solar desalination processes, air and / or seawater are heated by solar energy. When the air and / or seawater are forced to circulate, the water production is relatively large, but power consumption is required, which is called an active process; on the contrary, if the air flows by natural circulation and the seawater does not flow, no power consumption is required, but The water production is relatively low, which is called a passive process. [0003] The main advantages of ...

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Problems solved by technology

[0006] In 2016, in the magazine "Desalination", Egypt's A.E. Kabeel et al. used the method of spraying bubbling humidification downwards for the first time by porous pipes, instead of bubbling upwards with porous sieve plates, and solved the problem of leakage caused by bubbling with sieve plates. However, the latent heat of water vapor condensation is not recovered in the process, resulting in a low utilization rate of solar heat and a relatively low water production rate.

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