Shenzhen solar thermal power generation
Solar thermal power generation is the use of collector solar radiation energy into heat energy, and then through the turbine, generator to generate electricity. According to the heat collecting temperature, solar thermal power generation can be divided into high power and low power two. According to the solar energy collection mode classification, solar thermal power stations are mainly type and plate type tower, channel three.
Tower solar thermal power generation is a large high temperature solar thermal power generation, as shown in figure 2.11. America, Japan and Europe have been built some of the thousands of solar power plant MW. Tower solar thermal power generation is the collector on the top of the tower, parts of it are the mirror array, towers, heat collector, heat storage, generator etc.. The mirror array composed of many mirror arranged according to certain rules. These mirror automatic tracking the sun, reflected light can be accurately projected onto the collector window. The tower can be built in the mirror array central or south. The collector is designed according to the demand to unilateral light or surrounded by light. When the sunlight to heat collector is absorbed into the heat, the heating coil inside the flowing medium (water or other media) to generate steam. A part of the heat is used to drive the turbine generator set; another part of the heat is stored in the Qiang heat exchanger, for no sunlight power generation. The key technology of tower solar power has the following three aspects:
1) mirror and its automatic Lang trace
Since the power requirements of high temperature and high pressure, to focus the sunlight must be greater concentration ratio, by using dry hundred mirror, and have a reasonable layout, the reflected light can be concentrated to the collector in a smaller window. Mirror reflecting rate in more than 80% 90%, automatic tracking to synchronize the sun, a computer control.
2) collector
The collector must meet the requirements of small size, high conversion efficiency. The current collector in various forms, a cavity type, disc, cylinder etc.. Is generally believed that the disk solar boiler in Italy developed better, superheated steam which can produce 15Wa, 600 ℃, for 350 Kw generating units.
Heat 3)
Due to the sun radiation intensity changes with time, in order to ensure the power is relatively stable, must adopt measures, heat, which is indispensable in the tower solar thermal power generation part, but has not found the ideal thermal storage materials. America Nirvana salty Er company on 300 kinds of melting in the mixture of salt of 262 - 321 ℃ was evaluated, selected from 10 kinds of good heat storage material. |
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