New energy-saving and environmental protection technology: Graphene coated condenser can save energy for power plants
Massachusetts Institute of Technology research shows that the power plant condenser is coated with graphene can improve energy efficiency. According to the data provided by the American Electric Power Research Institute, the efficiency can be increased by 2% to 3% if this condenser is used throughout the plant. Relevant papers published in the Nano Express report pointed out that one of the basic elements of steam power generation is the heat transfer of condensate water. In a steam-powered power plant, water is heated to produce steam to propel the turbine into rotation, turning the turbine to generate electricity. During this process, the steam is condensed back to the water and the cycle begins again. According to IEEE's Spectrum magazine website, MIT's team scrutinized the condensers and found a fourfold increase in thermal conductivity when graphene coatings were added to their surfaces. Paper author Daniel Preston said: "This means that every power plant can save millions of dollars per year." The condenser efficiency is improved because graphene can resist the formation of a condensate film. In a typical condenser system, a metal coil, usually copper, is placed in the steam stream, and in some systems, the condensation process results in a thin film of water outside the metal coil; in other systems, Form water droplets. When the water film is formed, the heat conduction of the condenser is suppressed to some extent. Researchers use the hydrophobic nature of graphene to ensure that water droplets form on the condenser coil. Although polymer coatings can achieve this effect more or less, they degrade rapidly, and worse, sometimes too thick, but more problematic than the water film itself inhibits To be serious. After testing the material at 100 degrees Celsius in pure water vapor, the researchers found that graphene-coated metals were 4 times more thermally conductive than bare metals and they calculated that their efficiencies could be increased by a factor of 5 by optimizing different temperatures in the system To 7 times. Most importantly, there was no evidence of digestion during the test period of more than two weeks for the graphene coating, whereas the polymer coating began to degrade within 3 hours and failed completely within 12 hours.
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