China to produce Advanced Alloys for SuperCritical Steam Turbines (US)

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China has already manufactured a 12% Chromium high-quality forged rotor for an 1,000MW USC (ultra-supercritical) steam turbine under high pressure. (Credit Photo @ China Tech Gadget)

Focus

  • Up to now the key high temperature materials for supercritical and ultra supercritical power units are still mainly imported from foreign countries.
  • China requires to make the key high temperature materials by our national enterprises
  • For making seamless tubes and large pipes, China enterprises will be equipped with more 35MN, 60MN and one 350MN extrusion machines in the near future.
  • Large-scale castings for 1000MW USC steam turbine already can be made in China
  • Large-scale forging have been also trial-produced.
  • China has already manufactured a 12% Chromium high-quality forged rotor for an 1,000MW USC (ultra-supercritical) steam turbine under high pressure.

AA

China’s strategy to meet its greenhouse gas commitment is to continue full steam ahead converting its coal-fired power plant fleet from a conventional one to an ultra-supercritical one — a move that will decrease its energy intensity from coal-generated power by more than 20 percent. A coal-fired power plant operates by boiling water to create a high-pressure steam that drives a turbine which produces electricity by moving an electrical wire through a magnetic field. A conventional (or subcritical) plant typically operates at temperatures up to 1050 degrees Fahrenheit and has an efficiency of between 33 and 39 percent. Operating a plant at higher temperatures and pressures can increase its efficiency, potentially lowering emissions of carbon dioxide (CO2) in the process. A so-called supercritical plant operates at sufficiently high pressures and temperatures (between 1000 and 1075 degrees Fahrenheit) such that the water and steam become indistinguishable (the critical point of a liquid), allowing efficiency rates to reach 42 percent. An ultra-supercritical plant operates at temperatures of 1075 degrees Fahrenheit and above and can achieve efficiencies of more than 42 percent. China has jumped into the ultra-supercritical game with both feet. It is busy building supercritical and ultra-supercritical power plants at an astonishing rate — a whole lot faster, by the way, than we are here in the United States. And China’s ultra-supercritical power plant that went online in Yuhuan in 2006 reportedly holds the record as “the world’s cleanest, most efficient and most advanced ultra-supercritical units” with an efficiency of 46 percent. Up to now the key high temperature materials for supercritical and ultra supercritical power units are still mainly imported from foreign countries. China requires to make the key high temperature materials by our national enterprises. For making seamless tubes and large pipes, China enterprises will be equipped with more 35MN, 60MN and one 350MN extrusion machines in the near future. Large-scale castings for 1000MW USC steam turbine already can be made in China. Large-scale forging have been also trial-produced. High-purity low alloy steel forging for low pressure rotor and 12%Cr high-quality forged rotor for 1000MW USC steam turbine high pressure rotor are made in China.

Source : China Tech Gadget

Posted in Strategy.

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