Semi-immersed type solar seawater desalination system

Abstract

The invention discloses a semi-immersed type solar seawater desalination system, which belongs to the field of solar heat collection and seawater desalination. The semi-immersed type solar seawater desalination system comprises a Fresnel lens, a curved light-transmitting membrane, a light-transmitting thin plate, a vacuum tube, a condenser tube, a water collection bottle and so on. During operation of the desalination system, sunlight is converged onto sea surface by the Fresnel lens and is absorbed by the black absorption coating on the inner side wall surface of the vacuum tube after two times of refraction, the generated heat is used for heating and evaporating the seawater in the vacuum tube, and the generated vapor condenses on the surface of the condenser tube to obtain fresh water. In addition, the heat released by condensation is used to heat and evaporate the seawater in the condenser tube, the generated vapor enters the condensation cavity formed by the light-transmitting membrane and the light-transmitting thin plate from the outlet of the condenser tube and condenses to obtain fresh water again, and a user can directly collect fresh water via a non-return valve on the water collection bottle. The semi-immersed type solar seawater desalination system disclosed by the invention can directly float on the sea surface, adopts a two-stage evaporation structure, and can efficiently realize seawater desalination.

Description

technical field [0001] The invention relates to a semi-submerged solar seawater desalination system, which belongs to the technical field of solar heat collection and seawater desalination. Background technique [0002] As an indispensable and important resource in human life, fresh water has been paid more and more attention to by people, especially in coastal areas. Seawater desalination technology is an important means for us to obtain fresh water resources, and solar desalination technology is an emerging seawater desalination technology. At present, solar desalination technology is mainly divided into two categories, one is membrane desalination system using reverse osmosis technology, and the other is thermal desalination system using distillation technology. Among them, the current reverse osmosis technology mainly uses photothermal or photovoltaic power generation to power the pumps in the system, but the reverse osmosis method requires more stringent seawater pretr...

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Problems solved by technology

[0003] (1) If solar cells or heat collectors are used, the manufacturing cost is high, which is not conducive to popularization

[0004] (2) The seawater storage in the device is large and the thermal inertia is high, which reduces the system efficiency and is not conducive to the upgrade of the device

[0005] (3) The raw water in the device is extracted from the sea, which consumes a certain amount of energy

[0006] (4) The device needs a large receiving area to absorb solar energy, and the cost of land use is too high; therefore, to overcome the above four defects and strengthen the evaporation and condensation process is the main direction to improve the performance of the solar desalination device

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