Heat-collection type solar multistage flash evaporation seawater desalting device and method

Abstract

The invention provides a heat-collection type solar multistage flash evaporation seawater desalting device which comprises a solar heat collector, an auxiliary electric heater, a flash evaporation device, a heat exchanger, a cavity, a fresh water collector, a seawater inlet pump, a vacuum pump, a seawater circulation pump, a concentrated seawater outlet pump and a PLC, wherein the flash evaporation device comprises a first-stage flash evaporation bucket, a second-stage flash evaporation bucket and a third-stage flash evaporation bucket which are serially connected in sequence from bottom to top through a pipeline; the pressure of the flash evaporation buckets is reduced gradually. The heat-collection type solar multistage flash evaporation seawater desalting device provided by the invention is capable of heating seawater with solar energy sufficiently, is relatively low in cost, good in seawater desalting effect, free of chemical addition and clear in obtained fresh water; moreover, after heat exchange of concentrated seawater discharged from a final stage and newly fed seawater, the discharge seawater can be adopted to make salt, so that waste recycling can be achieved; in addition, as fresh water can be output, the operation that the seawater is directly pumped out by using power devices such as a pump can be avoided, and a cavity is selected as a liquid conveying device instead, so that a very small amount of energy can be consumed.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and mainly relates to a heat-collecting solar multi-stage flash seawater desalination device and method. Background technique [0002] With the growth of the world's population, rapid economic development and climate change, the crisis of global fresh water resources continues to aggravate. About 36% of the world's population lacks clean and safe drinking water. At the same time, the shortage of water resources also hinders the development of industries. . my country is also one of the countries with water shortages. Due to environmental pollution in recent years, fresh water resources have decreased sharply, which has had a great impact on the stable development of society. The lack of fresh water resources is a problem faced by all countries in the world, and the use of seawater desalination to solve the shortage of water resources has become a problem that many countries are pay...

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention aims at the problems encountered by the current seawater desalination equipment, and provides a simple structure, good seawater desalination effect, and a reasonable design of heat-collecting solar multi-stage flash seawater desalination device and method

Images