Solar seawater desalination device which is provided with two opposite pipes and based on membrane distillation

Abstract

The invention discloses a solar seawater desalination device which is provided with two opposite pipes and based on membrane distillation and belongs to the technical field of solar seawater desalination. The main structure of the device comprises the solar vacuum heat collecting pipe, the waterproof air-permeable membrane pipe, a condenser, a heat exchanger, a water supplementing pump, a draughtfan, a fresh water collecting box, a sealing plug and a supporting net, wherein the solar vacuum heat collecting pipe and the waterproof air-permeable membrane pipe are opposite to each other. An inner pipe of the opposite solar vacuum heat collecting pipe absorbs solar energy for heating, and seawater between the inner pipe and the waterproof air-permeable membrane pipe is heated and evaporated;under the action of the vapor pressure difference between the inside and outside of the waterproof air-permeable membrane pipe, vapor enters the waterproof air-permeable membrane pipe. Under the action of the draught fan, the vapor in the pipe is taken out by an airflow and condensed into fresh water by the condenser. Low-temperature seawater is preheated by latent heat of vaporization which is released by condensation of the vapor in the condenser; high-temperature concentrated seawater in the heat exchanger preheats low-temperature air so as to further improve the water production efficiencyof a system. The solar seawater desalination device has the advantages of simple structure, high water production efficiency and the like, and is favorable for solving the water use problems of residents in coastal areas, isolated islands and the like.

Description

[0001] Technical field [0002] The invention belongs to the technical field of solar seawater desalination, and in particular relates to a seawater desalination device which utilizes the inner space of a solar vacuum heat collection tube to directly perform membrane distillation. Background technique [0003] About 70% of the earth's surface is covered by water, and the fresh water that humans can drink is very small and extremely unevenly distributed. Taking China as an example, most of the fresh water is distributed in the middle and lower reaches of the Yangtze River and other places, while in the northwest of China and the Loess Plateau, fresh water is in short supply. Therefore, the shortage of fresh water has become one of the main environmental resource problems in the world today. [0004] Seawater desalination technology is one of the main means to solve this problem, and has become the main research field in all countries in the world. Early seawater desalination ...

AI Technical Summary

Problems solved by technology

Taking the traditional solar vacuum heat collection tube as an example, the seawater is heated in the tube and transported to another device for evaporation through the pipeline. Mass production poses difficulties

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