Hot film coupling seawater desalination process

Abstract

The invention relates to a hot film coupling seawater desalination process, which comprises a sea water pretreatment procedure, a hot method seawater desalination procedure and a film method seawater desalination procedure, wherein the hot method seawater desalination procedure comprises evaporation and condensation; the film method seawater desalination procedure comprises sand filtering, ultra filtering and reverse osmosis; according to different relationship between the cooling water discharging water quality generated through the hot method seawater desalination and the water inlet water quality of the film method seawater desalination, the water inlet resources of the film method seawater desalination are flexibly controlled. The hot method seawater desalination and the film method seawater desalination are organically combined; the seawater and heat utilization rate is high; the film method seawater desalination sufficiently utilizes the hot method seawater desalination heat; the film flux is increased; the seepage pressure is reduced; the efficiency is improved; the cooling discharge water generated by the hot method seawater desalination is directly used as the film method seawater desalination inlet water, so that the seawater taking quantity and the water discharging quantity are obviously reduced; the hot method seawater desalination and the film method seawater desalination share one set of pretreatment device; the cost is reduced; finished product water tanks are respectively set for the film method seawater desalination and the hot method seawater desalination; the operation is flexible; different requirements can be met.

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 process. 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 dema...

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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 metho

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