Multi-stage falling film seawater desalination device combined with parabolic surface concentration and hot steam pulsation

Abstract

The invention discloses a paraboloid condensation and hot steam pulsation combined multistage falling-membrane seawater desalination device. The paraboloid condensation and hot steam pulsation combined multistage falling-membrane seawater desalination device comprises a compound parabolic concentrator, a convex transparent material, water distributors, a heat receiver and a semipermeable membrane. Light rays are focused on the heat receiver after entering the compound parabolic concentrator and being subjected to reflection of the inner surface and secondary reflection of the vertical wall face, and with temperature rising continuously, the heat receiver heats seawater. A bottom chamber is similar to a cytomembrane structure, the seawater evaporates continuously, and pressure in the chamber increases to enable bottom hot seawater to be pumped from a guide pipe into the top water distributor by means of pulsation and then form falling-membrane flowing on the upper surface of a convex. Steam close to a lower chamber condensates on the lower surface of the convex, and heat is transferred to a falling-membrane water body on the upper surface to enable the steam to evaporate. The seawater flows down stage by stage under the action of gravity, the concentration of the seawater in the bottom chamber increases, and external seawater is supplied due to the fact that pure water decreases in the chamber under the action of the semipermeable membrane on the bottom side of the chamber. Fresh water tanks disposed on reflection surfaces of evaporation chambers in all layers are used for outputting fresh water.

Description

Technical field [0001] The invention belongs to the technical field of solar energy concentration and desalination utilization. Specifically, it is a new structure composed of compound parabolic concentrator and multi-stage falling film seawater desalination with pulsating pump water. Background technique [0002] Almost all of the water on Earth is stored in the oceans. When the water on the earth is irradiated by sunlight, it turns into water vapor and is evaporated into the air. When the water vapor meets the cold air at high altitude, it condenses into small water droplets, and the small water droplets form clouds, and finally fall to the land. Fresh water is used by humans. Solar desalination is a fundamental way nature produces fresh water. The use of solar energy desalination can better balance the needs of energy and water sources, save energy, protect the environment, and form huge economic and environmental benefits. Development of desalination technology. How...

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Problems solved by technology

The space utilization rate of the device is low, the latent heat of condensation of hot steam is not recovered, and the water production is low

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