Shenzhen solar energy distillation desalination of sea water
The water resources on the earth about salt water accounted for 97%, with the increase of population and the development of the industry, the city water shortage. In order to solve the problem of water shortage is increasingly serious, desalination of sea water has been paid more and more attention. The world's first solar water distiller is established in Chile in 1872, the area is 44504m2, Nissan freshwater 17.7t. The solar energy distillation desalination of sea water device has been working to Ulo years, visible solar desalination of sea water has a long history. In twentieth Century 70's energy crisis, the solar desalination of sea water has been more rapid development.
Solar desalination of sea water device in the most simple is his solar still (see Figure 2.13). It is filled with sea water and in its coverage of glass or transparent plastic Yi plate. The water wheel surface Xu black, bottom insulation. Cover plate, a roof type, tilt to the two lan. Solar radiation through the transparent cover, water after water absorption, evaporated into steam. The rising steam contact with the cover plate cooler is condensed into water, along the inclined plate flow gullies, and then injected into the water collecting tank. This pool type solar still is a direct distillation apparatus, which directly use solar energy to heat water and the evaporation. Pool type solar still has the advantages of simple structure, but also low efficiency of freshwater. There is another kind of multiple effect solar still, which is an indirect solar distiller, mainly by the absorption of solar collector and the evaporator, and the heat collector hot water in the evaporator of water evaporation. Diagram 2.14 is a solid German design flat type multifunctional solar distiller. The device can continuously produce fresh water.
In drought desert the saltwater on and Tada will be together promising greenhouse. Fig. 2.15 schematic diagram of the apparatus. This device adopts filter glass special, just stop the infrared light, and let the visible and ultraviolet through, for photosynthesis to. During the day with salt water sprayed on the glass plate, due to the absorption of infrared absorb the heat generated by the heat, and then flows back to the pool. Night storage water re circulation, to provide heat in greenhouse. Sprinkle on the glass plate on the saline part of evaporation, the steam condensation in the greenhouse and negative entropy board, and then along the plate into the water recycling pool. Preparation of seawater or brackish water from the fresh water except used to irrigate plants in greenhouses, nimble than fresh water can also be used for other purposes. |
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