Phase-change heat-storage-type salt water desalting device based on diurnal temperature variation and using method

Abstract

The invention discloses a phase-change heat-storage-type salt water desalting device based on a diurnal temperature variation and a using method. The phase-change heat-storage-type salt water desalting device comprises a water supplying device, a phase-change heat storage device, a sleeve and a water storage tank. The phase-change heat storage device is a solar energy heat collection and storage device which uses a phase-change material as a heat storage working medium. A salt water desalting method comprises the following steps: while receiving illumination at daytime, converting solar energyto heat energy for storing by the phase-change material; at night, salt water to be processed is heated to a certain temperature through a copper pipe in the heat storage device and flows into an inner pipe of the sleeve, part of the heated salt water is evaporated into water vapor, is condensed when encountering the inner wall of the outer pipe with a low temperature and is converged in the outer pipe, then flows to the water storage tank through the outer pipe. The heat storage device can store a large amount of heat and heat the salt water to the higher temperature. The salt water of whichthe temperature is reduced can be reflowed and reheated, so that a purpose of maximally using the heat is achieved. The device is capable of, through developing an efficient photo-thermal conversionphase-change heat storage material, improving a solar radiation utilization ratio, and reducing energy consumption for unit fresh water.

Description

technical field [0001] The patent of the present invention belongs to the field of solar thermal utilization, and relates to a device and method of using solar energy for desalination of salt water, in particular to a phase-change heat storage type salt water desalination device and method of use based on the temperature difference between day and night. Background technique [0002] my country is a country seriously short of water, with a per capita water resource of about 2400 m 3 , which is only 1 / 4 of the global per capita water volume, and the temporal and spatial distribution is uneven, and the water environment pollution is serious, especially in the arid areas of Northwest China. Salt, high fluorine content. Solar-powered salt water desalination technology is of great significance to solve problems such as the shortage of fresh water resources and the desalination of polluted water. At present, the solar distillation devices developed generally have disadvantages s...

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Problems solved by technology

At present, the solar distillation devices developed generally have disadvantages such as low water production, low solar energy utilization efficiency, and high equipment investment. Therefore, it is necessary to conduct in-depth research and development on the basis of existing solar distillation technology.

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