System and method for performing comprehensive utilization of concentrated seawater by utilizing frequent electrode transfer electrodialysis
A technology of frequent electrode reversal and electrodialysis, applied in seawater treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of marine ecological environment pollution, unfavorable, large land area occupied by calcium removal, etc., to reduce operating costs cost, increase system efficiency, and reduce pollution
Inactive Publication Date: 2016-12-07
HARBIN BOILER
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Problems solved by technology
[0003] The concentrated seawater produced by the existing seawater desalination plant will produce calcium sulfate scaling during the further evaporation and concentration process, resulting in the failure of the evaporation device to operate normally
Since the problem of calcium sulfate scaling cannot be solved, the concentrated seawater is basically returned to the sea, causing great pollution to the marine ecological environment
[0004] The conventional solarization method for decalcification occupies a large amount of land area, which is not conducive to improving the utilization rate of resources
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[0020] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Furthermore, it should be understood that development work, while potentially complex and time-consuming, would be a routine undertaking for those skilled in the art having the benefit of this disclosure.
[0021] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the solution ac...
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The invention relates to a system and method for performing comprehensive utilization of concentrated seawater by utilizing frequent electrode transfer electrodialysis and belongs to the technical field of utilization of concentrated seawater. The concentrated seawater continues to be concentrated through an automatic frequent electrode transfer electrodialysis device, and permselectivity of an ion exchange membrane is utilized to block divalent ions to prevent an evaporator from scaling. After being concentrated, the concentrated seawater is preheated through a preheater to enter a NaCl mechanical steam recompression system to undergo evaporation and concentration to obtain NaCl salt slurry. The salt slurry is centrifuged through a centrifuge to obtain finished NaCl, and bittern after centrifugal removal of NaCl serves as a raw material for preparing KCl, is preheated through the preheater and then enters a KCl mechanical steam recompression system; and KCl salt slurry is obtained through evaporation and concentration. After undergoing cooling crystallization, carnallite is processed through the centrifuge to obtain finished KCl salt, and old brine after the removal of KCl serves as a bromine extraction raw material to be substituted with Cl2 to obtain bromine. By adoption of the system, the pollution to the marine ecological environment caused by the discharge of the concentrated seawater is reduced.
Description
technical field [0001] The invention relates to a system and method for comprehensive utilization of concentrated seawater by frequent electrode reversal electrodialysis, through selective ion exchange membrane treatment and separation process and mechanical vapor recompression system to improve salt production efficiency and obtain valuable products such as NaCl, KCl and Br . Background technique [0002] With the rise of the seawater desalination industry, the negative impact of the discharge of by-product concentrated seawater on the environment has gradually emerged. Using concentrated seawater to make salt is an effective way to solve the problem of concentrated seawater discharge. [0003] The concentrated seawater produced by the existing seawater desalination plant will produce calcium sulfate scaling during the further evaporation and concentration process, which will cause the evaporation device to fail to operate normally. Since the problem of calcium sulfate sca...
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IPC IPC(8): C02F9/10C01D3/06C01B7/09C02F103/08
CPCC01B7/096C01D3/06C02F1/041C02F1/4693C02F2103/08
Inventor 李崇超任显龙原雪迪王新鹏苏晓雯张振华白浩李睿于得旭纪红
Owner HARBIN BOILER