Low temperature multiple-effect seawater last effect evaporator and working method thereof

Abstract

The invention relates to a low temperature multiple effect seawater desalination final-effect condenser, which is characterized in that the condenser comprises a shell, a feeding seawater heat exchange tube, a cooling water heat exchange tube, a tube plate and an intermediate diaphragm; the working procedure thereof is as follows: (1) a final-effect secondary steam enters into the shell pass of the shell of the final-effect condenser from an inlet; (2) feeding sea water enters into the tube pass of the feeding seawater heat exchange tube from a feeding seawater inlet and is discharged from a feeding seawater outlet after being preheated; (4) steam is controlled by quantity of water and water temperature in the two heat exchange tubes and is freely distributed; (5) the feeding seawater in the tube pass of the feeding seawater heat exchange tube and the cooling water in the cooling water heat exchange tube are respectively warmed by the steam of the shell pass, and simultaneously the steam in the shell pass is condensed into the fresh water. The condenser simplifies the equipment layout, pipeline design and reduces the cost.

Description

(1) Technical field: [0001] The invention relates to the field of seawater desalination, in particular to a low-temperature multi-effect seawater desalination final-effect condenser and a working method thereof. (two) background technology: [0002] Seawater desalination, also known as seawater desalination, is the technology and process of separating salt and water in seawater. [0003] Distillation, that is, thermal method, is the earliest seawater desalination technology and the most important method for seawater desalination. Seawater desalination by distillation is the process of heating and evaporating seawater, and then condensing the steam to obtain fresh water. [0004] Multi-effect evaporation is to evaporate the heated seawater in multiple evaporators in series. The steam evaporated from the previous evaporator is used as the heat source of the next evaporator and condensed into fresh water. This evaporation and condensation process follows a series of evaporator...

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Problems solved by technology

[0009] 3. The manufacturing materials, manufacturing costs and heat loss of two heat exchangers will be relatively large;

[0010] 4. For scheme two, the final effect condenser must be made of the same material, and all heat exchange tubes must be made of titanium tubes or other high-corrosion-resistant tubes, which will increase the cost of the device;

[0011] 5. A heat exchanger must use pretreated seawater to condense, which will increase the burden of seawater pretreatment and cause waste

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