Desalting apparatus and process for seawater or brackish water by moistening-drying

A brackish water and seawater technology, which is applied in seawater treatment, water/sewage treatment, degassed water/sewage treatment, etc., can solve the problems of difficult sealing of equipment, reduction of effective heat transfer area, difficulty in heat transfer enhancement, etc. Achieve the effect of small investment, flexible device scale and large output

Inactive Publication Date: 2006-05-10
TIANJIN UNIV
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Problems solved by technology

Some people use multi-layer flat polyester polymer film to form a compression plate and frame heat exchange structure. However, due to the consideration of heat exchange efficiency, the polymer film can only be used in a very thin thickness. Adjacent layers of films are pasted together, and a sufficient distance must be kept between adjacent layers, which greatly reduces the effective heat transfer area of ​​the entire device per unit volume
Another disadvantage of the flat film structure is that it is difficult to seal the entire device, and it is difficult to effectively enhance heat transfer

Method used

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  • Desalting apparatus and process for seawater or brackish water by moistening-drying

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Embodiment Construction

[0013] use as figure 1 The shell-and-tube desalination unit shown is operated vertically. The evaporation and humidification process is completed on the tube side of the heat exchanger, and the condensation and dehumidification process is completed on the shell side of the heat exchanger. The preheated seawater or brackish water is introduced into the upper head 4 from the hot brine inlet 3, through overflow, or through a specially designed liquid distribution device, so that the seawater or brackish water is evenly distributed into the pipe, and the water is discharged by gravity. The effect is the falling film flow along the inner wall of the tube. The temperature of the feed water is generally between 50 and 95 °C, and the flow rate varies depending on the number and diameter of the heat exchange tubes of the equipment. Usually, the falling film load is 0.0001 to 0.01 kg m -2 the s -1 between 0.0008~0.008kg m -2 the s -1 better. The carrier gas is introduced into the ...

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Abstract

A moistening-demoistening apparatus for desalinating seawater or bitter saline is composed of a main body which is a vertical heat exchanger consisting of heat eaxchanging tube and casing, an auxiliary heating connection tube on its top closure head, a boffling barrier between said heat exchanger and casing, and a lower closure head with carrier gas inlet and concentrated saline outlet. Its desalinating process features that the seawater or bitter saline flows downward while the carrier gas flows upward and is continuously moistened, and the carrier gas is then cooled and demoistened to obtain fresh water.

Description

technical field [0001] The invention relates to a humidification-dehumidification desalination device and process, belonging to seawater or brackish water desalination technology. Background technique [0002] Ordinary humidification-dehumidification and desalination process is developed on the basis of solar distiller, which separates the evaporation equipment from the condensation equipment, controls their respective temperatures, humidifies the air with brine in the evaporation equipment, and humidifies the air in the condensation equipment. The humid air is condensed to dehumidify to obtain fresh water. This process can be carried out with various types of evaporating and condensing equipment. For example, ZL98232617.3 adopts a paper cross-type paper honeycomb structure or porous ceramic structure evaporation equipment as the core component, and forms a set of humidification-dehumidification desalination system with another condensation equipme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/10C02F1/20C02F103/08
CPCY02A20/124
Inventor 王世昌熊日华王志解利昕李凭力徐世昌王纪孝王宇新朱爱梅丁涛
Owner TIANJIN UNIV
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