Seawater desalination system capable of producing water according to quality and synchronously concentrating reverse osmosis

Abstract

A raw water pump is connected with a first-stage high-pressure pump and then is connected with a water inlet of a first-stage first-section reverse osmosis membrane stack, and a concentrated water opening of the first-stage first-section reverse osmosis membrane stack is connected with an inter-section booster pump and then is connected with a water inlet of a first-stage second-section reverse osmosis membrane stack and a drain valve; a concentrated water port of the first-stage and second-section reverse osmosis membrane stack is connected with a circulating pump through a pipeline and then is connected with a discharge valve; a concentrated water end water producing port of the first-stage and first-section reverse osmosis membrane stack is respectively connected with a second-stage high-pressure pump and a water producing port of the first-stage and second-section reverse osmosis membrane stack through pipelines; the second-stage high-pressure pump is connected with a water inlet of the second-stage reverse osmosis membrane stack through a pipeline; a water production port of the secondary reverse osmosis membrane stack is connected with a product water pipe; a water outlet at the water inlet end of the first-stage first-section reverse osmosis membrane stack is connected with a product water pipe through a pipeline; and a concentrated water port of the second-stage reverse osmosis membrane stack is connected with an inlet of the first-stage high-pressure pump through a pipeline. According to the invention, high-efficiency concentration of seawater is synchronously realized in the high-recovery-rate quality-divided water production process.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a seawater desalination system for water production by quality and simultaneous concentration and reverse osmosis. Background technique [0002] As an open source incremental technology, seawater desalination is currently widely used in electric power, chemical industry, petroleum and other industries. Among them, circulating cooling water is the main use. It has clear requirements for the salinity and chloride content in the desalinated water. The primary reverse osmosis water is subject to Due to the influence of water quality requirements and seawater temperature, the salinity and chloride content of produced water are difficult to meet the requirements of industrial circulating cooling water. Generally, two-stage reverse osmosis desalination is required. The traditional two-stage reverse osmosis scale is large and the investment is high, which further...

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Problems solved by technology

[0002] Seawater desalination, as an open-source incremental technology, is currently widely used in electric power, chemical, petroleum and other industries, among which circulating cooling water is the main purpose, and it has clear requirements for salinity and chloride content in desalinated water. Due to the influence of water quality requirements and seawater temperature, the salinity and chloride content of the produced water are difficult to meet the requirements of industrial circulating cooling water. Generally, two-stage reverse osmosis desalination is required. The traditional two-stage reverse osmosis has a large scale and high investment, which further increases In addition, the recovery rate of the current reverse osmosis desalination system is only 40-45%, and most of the concentrated seawater is directly discharged. The concentrated seawater is rich in bromine, potassium, sodium, magnesium and other elements, which can be used as important raw materials for the salt chemical industry. Concentrated brine is subject to the influence of low salinity, and direct use will lead to high cost. Therefore, it is necessary to develop desalination technology with high recovery rate to further increase the salinity of concentrated seawater, which will help to promote the complete solution of the discharge problem of concentrated seawater

[0003] Chinese patent CN 113354032 A discloses a reverse osmosis system for seawater desalination, using multi-stage reverse osmosis systems connected in series, a freshwater circulation pump is installed on the freshwater side to circulate the freshwater, and a circulation pump is installed on the concentrated water side to circulate the concentrated water, and the salinity of concentrated seawater is significant Although the patent can realize high salinity concentrated seawater with high recovery rate, but because the feed water side is equipped with a certain salinity liquid circulation, the system does not produce desalinated water, only the concentration system

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