A solar seawater evaporator

Abstract

The invention relates to a solar sea water evaporator. The solar sea water evaporator comprises a sea water pretreatment unit (1), a sea water tank (3), a lift pump (5) and a heat exchange water tank (8) which are sequentially connected, wherein the heat exchange water tank (8) is internally provided with a spiral heat exchange tube (9); the lower end of the spiral heat exchange tube (9) is provided with a fresh water collection outlet; an outlet at the lower side of the heat exchange water tank (8) is connected with a water inlet in one end of a solar heat pipe type heat collector (14); a water outlet in the other end of the solar heat pipe type heat collector (14) is connected with a solar still (21); condensation pipelines at the two sides of the solar still (21) are connected with a connector at the upper end of the spiral heat exchange tube (9) after passing through an air pump (20); the tail of the solar still (21) is provided with a fresh water collecting outlet and a strong brine collecting outlet. A solar sea water desalination core technology is adopted by the solar sea water evaporator, and the water production rate of solar sea water desalination is multiplied.

Description

technical field [0001] The invention relates to a high-efficiency and energy-saving seawater desalination device, in particular to a solar seawater evaporator. Background technique [0002] At present, the capacity of seawater desalination devices in the world is growing rapidly, at a rate of 10% to 30%, and the growth rate is still increasing gradually. More than 130 countries around the world are desalinating seawater, and more than half of the desalination capacity is concentrated in the Middle East Gulf countries, accounting for 70% of the Middle East's freshwater sources. There are mainly two kinds of engineering seawater desalination process routes at home and abroad: thermal method and membrane method. However, these two methods have the problems of complicated pretreatment, low localization of equipment, large energy consumption, and high processing costs. The comprehensive cost of seawater desalination per ton of water is about 8 yuan. It is difficult to use it o...

AI Technical Summary

Problems solved by technology

At present, the research and application of solar desalination is mainly based on distillation, and the output per unit area of ​​traditional solar stills is too low (in fine weather, the fresh water production per square meter of daylighting area is about 3.5-4.0kg

) is the main reason for its difficulty in large-scale promotion

There are three serious defects in the existing solar stills, one is that the latent heat of condensation of the steam is not reused, but is lost to the atmosphere through the cover plate; the other is the heat transfer mode of natural convection in the traditional solar stills , which greatly limits the improvement of the thermal performance of the still; the third is that the heat capacity of the seawater to be evaporated in the traditional solar still is too large, which limits the increase of the operating temperature, thereby weakening the driving force of evaporation

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