Thermal membrane coupling seawater desalination system

Abstract

The invention discloses a thermal membrane coupling seawater desalination system which comprises a seawater pretreatment unit, a hot-method seawater desalination unit and a membrane-method seawater desalination unit, wherein the seawater pretreatment unit comprises a seawater taking pump station and a mixing flocculation sedimentation basin; the hot-method seawater desalination unit comprises a hot-method seawater desalination seawater inlet tank, a low-temperature multi-effect distillation seawater desalination device and a hot-method seawater desalination finished product water tank; the membrane-method seawater desalination unit comprises a membrane-method seawater desalination seawater inlet tank, a sand filtering tank, an ultrafiltration device, a reverse osmosis device and a membrane-method seawater desalination finished product water tank. With organic combination of hot-method seawater desalination and membrane-method seawater desalination, a high seawater and heat utilization rate can be increased; the heat of the hot-method seawater desalination is sufficiently utilized in membrane-method seawater desalination, the membrane flux is increased, the osmotic pressure is reduced, and the efficiency is improved; cooled discharge water generated from hot-method seawater desalination is directly used as fed water of membrane-method seawater desalination, so that the seawater amount and the discharge amount are remarkably reduced; as hot-method seawater desalination and membrane-method seawater desalination share one set of pretreatment devices, the investment and operation cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a thermal film coupled seawater desalination system. Background technique [0002] There is a shortage of fresh water resources in my country, especially the northern coastal areas are one of the most severe water shortage areas in my country. Seawater desalination is an inevitable trend to solve the shortage of water resources in coastal cities in my country. [0003] At present, seawater desalination technology is relatively mature. The commonly used seawater desalination technologies are mainly divided into thermal method and membrane method. Both methods have their own advantages and limitations. The thermal method is to heat and evaporate seawater to obtain steam, and then condense the steam into fresh water. Its advantages are low requirements on raw seawater, simple pretreatment, and low salt content in desalinated water. Phase change, high deman...

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Problems solved by technology

[0004] However, most of the current thermal film coupled seawater desalination technologies are simply a combination of the two methods, not a complete integration, and cannot give full play to the advantages of the two, resulting in high energy consumption and cost.

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