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Low-temperature multi-effect seawater desalting system and desalting method

A low-temperature, multi-effect distillation technology, applied in seawater treatment, general water supply saving, heating water/sewage treatment, etc., can solve the problems of low process recovery rate, high energy consumption, complex system, etc., and achieve high material water recovery rate, Low power consumption, low equipment investment and low operating costs

Inactive Publication Date: 2016-11-23
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology

[0006] In view of this, the present invention aims to propose a low-temperature multi-effect seawater desalination system and desalination method to solve the low recovery rate of the parallel feeding process, and the need to set up multiple flash tanks to recover concentrated water heat, system Complexity, high energy consumption and other issues

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  • Low-temperature multi-effect seawater desalting system and desalting method

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Embodiment Construction

[0036] Unless otherwise specified, the terms used herein have the meanings commonly understood by those skilled in the art. In order to facilitate the understanding of the present invention, some terms used herein are defined as follows.

[0037] As used in the specification and claims, TVC is a vapor compression ejector; both the pre-TVC desuperheating device and the TVC post-TVC desuperheating device are existing desuperheating devices.

[0038] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the ...

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Abstract

The invention provides a low-temperature multi-effect seawater desalting system and desalting method. Before raw materials enter a low-temperature multi-effect distillation system, when the raw material temperature is lower than the set temperature of materials entering a tail effect group of evaporators, the raw materials are preheated through a concentrated seawater heat exchanger, so that the raw materials reach the preset value when entering the evaporators; different-effect ingredient sections are used for feeding; concentrated water in the later effect group of evaporators is subjected to heat exchange with concentrated water recovered by the first effect group of evaporators through a concentrated water heat exchanger and enters the front effect group of evaporators. The problem of low material sea water recovery rate of the conventional parallel feeding flow process can be solved; the chemical adding and electric consumption cost is reduced; the defects of a conventional process mode are overcome; in addition, the heat efficiency of a low-temperature multi-effect desalting system is further improved; the equipment investment and operation cost is reduced; the technical flow process has the advantages of high water preparation ratio, high material water recovery rate, low electricity consumption, high heat efficiency, low equipment investment, low operation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a low-temperature multi-effect seawater desalination system and a desalination method. Background technique [0002] Low-temperature multi-effect distillation seawater desalination technology refers to the distillation and desalination technology whose maximum evaporation temperature of seawater is lower than 70°C. Evaporation and condensation, so as to obtain a desalination process of distilled water that is multiple times the amount of steam. [0003] The low-temperature multi-effect seawater desalination process is mainly composed of the material inlet method, the selection of the evaporator effect group, the heat exchanger form and position setting, etc. [0004] Depending on the process flow, the performance indicators of the low-temperature multi-effect distillation seawater desalination device are different, and the resulting equipment investment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F103/08
CPCC02F1/04C02F2103/08Y02A20/124
Inventor 袁秀坤唐刚郝兆朋蒋辰翔李桃高奇
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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