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Forward osmosis and multi-stage flash evaporation coupled seawater desalination system

A technology of forward osmosis and forward osmosis membrane, which is applied in the field of seawater desalination, can solve the problems of reducing the water production rate, the concentration of the draw solution cannot be too high, and the problem of the treatment of concentrated salt wastewater can not be solved, so as to achieve the effect of reducing the discharge

Active Publication Date: 2017-01-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its limitations are that it still fails to solve the problem of concentrated salt wastewater treatment after flash evaporation, and the problem that the concentration of the draw solution after flash evaporation cannot be too high due to scaling restrictions, thereby reducing the water production rate.

Method used

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  • Forward osmosis and multi-stage flash evaporation coupled seawater desalination system
  • Forward osmosis and multi-stage flash evaporation coupled seawater desalination system

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Embodiment Construction

[0037] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and embodiments. As a preferred embodiment, the present invention can be used for obtaining fresh water on ocean-going ships.

[0038] Such as figure 1 and 2 As shown, the system is mainly composed of a liquid supply unit and a multi-stage flash evaporation unit. The multi-stage flash unit consists of an auxiliary condensate heat exchanger 101 and a three-stage flash chamber, and each stage of flash chamber includes: an upper flash chamber 102, a water collection tray 103, a wire mesh demister 104, and a jacket water exchange unit. Heater 105 and lower flash chamber 106. The liquid supply unit consists of a draw liquid pump 107 and a forward osmosis membrane module 108 .

[0039] The forward osmosis membrane assembly 108 includes: a plurality of forward osmosis membrane filaments 202 arranged parallel to each other to form a column; three orifice plat...

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Abstract

The invention discloses a forward osmosis and multi-stage flash evaporation coupled seawater desalination system, which comprises a multi-stage flashing evaporation unit and a liquid supply unit, wherein the liquid supply unit comprises a forward osmosis membrane assembly for sucking the water in seawater through osmotic pressure difference and a sucked liquid pump for pumping the dilute sucked liquid in the forward osmosis membrane assembly into the multi-stage flashing evaporation unit to extract fresh water, and the outlet of the multi-stage flashing evaporation unit is connected to the forward osmosis membrane assembly to convey the concentrated sucked liquid into the forward osmosis membrane assembly. According to the present invention, the forward osmosis and multi-stage flash evaporation coupled seawater desalination system has advantages of fresh water yield increasing, service life prolonging, environmental protection, power consumption saving, and the like.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a seawater desalination system coupled with forward osmosis and multistage flash evaporation. Background technique [0002] Seawater desalination is an effective way to solve the freshwater crisis. At present, the widely used seawater desalination technologies include distillation and reverse osmosis. Among them, the distillation method is mainly based on low-temperature multi-effect and multi-stage flash evaporation. Reverse osmosis can produce large-scale fresh water in industry, but there are problems such as high energy consumption, low water recovery rate and difficult treatment of concentrated salty wastewater. [0003] Forward osmosis (FO), as an emerging membrane separation technology, uses the osmotic pressure difference on both sides of the membrane to realize the process of spontaneous water transfer, that is, water spontaneously diffuses from the highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/08
CPCY02A20/131Y02W10/37C02F1/445C02F1/06C02F2103/08C02F2301/08
Inventor 李扬王彬张靖鹏王勤金洪明沃崇娜金健安
Owner ZHEJIANG UNIV