Sea water desalination and concentrated sea water concentration integrated system and treatment method

Abstract

The invention relates to a sea water desalination and concentrated sea water concentration integrated system and a treatment method. The sea water desalination and concentrated sea water concentrationintegrated system comprises a multiple-effect evaporation sea water desalination subsystem, a regenerative heat concentration subsystem, a regenerative heat absorbing subsystem and a solution regeneration subsystem. According to the system, environment sea water is adopted as a raw material, more-than-0.15MPa steam or more-than-125DEG C hot water is adopted as a drive heat source, a small amountof electric energy is added, and fresh water with the saline concentration being lower than 0.003 percent and the concentrated sea water with the saline concentration being higher than 12 percent canbe produced, so that the fresh water is high-efficiently produced, meanwhile, a high-quality raw material solution is provided for various chemical substances such as salts, and the system has the advantages of high energy utilization ratio, high fresh water recovery rate, slow deposit corrosion, good economical efficiency and the like.

Description

technical field [0001] The invention relates to the field of seawater desalination and concentration, in particular to an integrated system and treatment method for seawater desalination and concentrated seawater concentration. Background technique [0002] Seawater desalination technology extracts freshwater from huge reserves of seawater, which has become an effective way to solve the problem of freshwater shortage. According to the separation mechanism, desalination methods can be divided into two categories: membrane method and thermal distillation method. In the thermal distillation method, the low-temperature multi-effect evaporation technology has attracted attention in recent years due to its advantages such as low working temperature (the maximum temperature of brine is lower than 70°C), slow corrosion and scaling, low power consumption, good performance under variable working conditions, and low operating cost. . [0003] The low-temperature multi-effect evaporat...

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Problems solved by technology

[0005] Chinese invention patent CN104528850B discloses a freshwater sea-salt thermal energy trigeneration system, which deals with primary concentrated seawater (concentration lower than 7%) produced by seawater desalination, and combines deep concentration and salt production. This system cannot directly seawater for treatment

[0006] Chinese invention patent CN103112985B discloses a low-temperature multi-effect steam turbine pressure steam distillation-multi-stage flash seawater desalination system, which uses the back pressure steam of the power plant for seawater desalination, and applies two conventional seawater desalination technologies—— Multi-stage flash evaporation and low-temperature multi-effect evaporation, the obtained fresh water and seawater with a salt concentration lower than 7%, and the recovery rate of fresh water is lower than 50%

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