| Molten salt provides more electricity in solar power plant |
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 Salt in the absorption tube is heated to 500 ° By using molten salt instead of oil to solar power stations more efficient, But one problem is that the salt can "freeze". Solar power plants that generate electricity using concave mirrors, directed against the sun's rays, one absorption tube in the mirror focus. In pipe flows usually oil is heated to about 400 ° C and pumped to a heat exchanger that heats water into steam, which, through a turbine and generator generates electricity. The higher the temperature of the heat conveying liquid the better the efficiency of the steam turbine, Researchers at Siemens will build a research facility with power conditioners at the University of the Evora in Portugal where the oil as the heating medium is replaced with molten salt. This allows the temperature raised to 500 ° C, which would improve the efficiency of this type of solar power plants. Another advantage of the saline solution compared with oil is that the pressure increases, and that it is not flammable. But the problem with salt is that it solidifies "freeze", at a temperature of 220 ° C. The researchers' task is to find the right mix of sodium and kaliumnitrater that keeps the salt liquid at temperatures below 150 ° C. A test facility in Portugal a power of 50 MW, There steam generator, absorption tube and the pumps are tested for the higher temperature, and the new medium's unique characteristics. |
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| Last Updated ( Saturday, 22 October 2011 ) |
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