U.S. researches heat capture power generation to improve energy efficiency
Rows of solar panels gleaming loomingly on the roof; the matrix-like windmills are spinning elegantly on the seashore, and such scenes are dotted with reports on the feasibility of clean energy. However, a more effective hope might come from those large factories-although some of them have installed special devices to harvest energy from their wasted heat. More importantly, this energy cycle process can reduce energy consumption and save a lot of money for companies and society.
This is a message released by the Energy Circulation Committee at the annual meeting of the American Association for the Advancement of Science in San Diego on February 21st. To clarify this issue, at this meeting, Lester Lave, an economist at Carnegie Mellon University in Pennsylvania, enumerated the results of the analysis recently obtained by a committee of the National Academy of Sciences under his chairmanship on the future of the US energy. -These analyses give first-hand "hard" data on energy efficiency.
Lave said: "For decades, the United States has been trying to solve the energy crisis by producing more energy." However, the committee found that by 2030, the energy efficiency of US energy use will be reduced by 28%.
Thomas Casten, chairman of the Recycling Energy Development Corporation in Westmont, Illinois, said that reusing waste heat to generate electricity is one of the most effective ways to improve energy efficiency. The company installed an industrial-scale energy recycling system.
Casten describes the work his company is doing at Cokenergy Mittal Steel Company, an Indiana-based steel plant, and he illustrates the potential advantages of this method. Steel mills bake coal into metallurgical coke, which is used to melt and mix steel. Casten said that the equipment added by the Recycling Energy Development Company can capture the heat released by the baking process, and then produce steam to drive the turbine, which ultimately generates 95 megawatts of electricity-a number equivalent to 2004 solar collectors worldwide The total amount of electricity produced. Similarly, the heat generated by power plants burning fossil fuels can be recycled, thereby doubling the efficiency of electricity production and halving the resulting carbon dioxide gas emissions.
Casten said that unlike other clean energy sources, the recycling of wasted energy actually makes it more profitable to reduce carbon dioxide emissions. He said: "This is good for the company, good for investors, and good for society."
PP plastic, also known as polypropylene plastic, is another fine resin varieties, following the development of nylon, which is a semi-crystalline materials, the advantage is obvious, with excellent mechanical properties and heat resistance, with a high not hydrophilic sex, almost non-absorbent. The disadvantage is poor low temperature impact resistance, easier to aging. However, for comparison PE plastic having a higher melting point.
PE plastic is polyethylene plastic, its corrosion resistance and electrical insulation are very strong. Rigid hardness and strength are relatively high, and the same PP plastic, it also very small water absorption.
Polycarbonate (referred PC) is a polymer molecular chain containing a carbonate group, an ester group according to the structure can be divided into aliphatic, aromatic, aliphatic - aromatic and other types. Which due to the aliphatic and aliphatic - aromatic polycarbonate lower mechanical properties, thereby limiting its application in engineering terms. Currently, only the aromatic polycarbonate obtained industrial production. Due to the special nature of the polycarbonate structure, it has now become the top five fastest growing engineering plastics in general engineering plastics.
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