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82 MaGaZine high-performance materials enhanCeD perForManCe for power plants (here in scholven) thanks to the new material from thyssenkrupp VDM. ---
high-performance materials MaGaZine speCiaL aLLoy For The eCo-FrienDLier poWer pLanT GeneraTions oF The FuTure --- As part of a team of power plant operators, boiler manufacturers and component producers, ThyssenKrupp VDM has developed a material which helps boost the performance of power plants. Modern plants have an energy conversion efficiency (ratio of energy input to energy output) of around 43 percent. Increasing temperatures and pressure permits higher conversion efficiencies which in turn reduce CO2 emissions. Attention is focusing in particular on so-called 700 degree technology, which will operate at temperatures of 700 degrees and a pressure of 350 bar. “This new power plant generation needs materials capable of meeting the extremely high requirements involved,” says Dr. Jutta Klöwer, head of research and development at ThyssenKrupp VDM in Werdohl. “We have developed an alloy which has already proved its suitability in extensive testing.” Nickel-based superalloys are already an established part of the gas turbines used in combined cycle power plants. The development of 700°C technology means they must now also be used in the boilers and steam turbines of coal-fired power plants. In collaboration with power plant operators and manufacturers, ThyssenKrupp VDM developed the special alloy Nicrofer 5520CoB-alloy 617b specifically for use in power plant boilers. It is based on the gas turbine material Nicrofer 5520Co-alloy 617. “By adding boron and controlling the content of strength-enhancing elements such as aluminum, titanium and cobalt, we succeeded in increasing the permissible mechanical stresses by 20 percent,” says Dr. Jutta Klöwer. “That allows engineers to use thinner-walled parts.” Pipes and components made from this alloy are already being used in a test plant in North Rhine-Westphalia – construction work on the first 700 degree power plant is scheduled to start in 2010. “The next step is to validate the cost-effective production of standard components from this alloy,” says Dr. Jutta Klöwer. “This will focus in particular on the extremely high quality requirements made by power utilities on boiler materials.” But research work is continuing: Engineers are already working on materials for the next-butone generation of coal-fired power plants. And not without reason: By the year 2030, global demand for electricity is expected to double. Innovations in the technology and materials of fossil-fueled power plants will play a key role in protecting the environment and conserving resources. --- 83
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Stainless + Alloys Our materials ar
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Contents 03 --- ThyssenKrupp Stainl
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To the business partners, friends a
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03 01 02 01 --- Jürgen H. Fechter
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01 Strategic focus sTainless sTraTe
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Strategic focus The goal of Thyssen
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02 Market environment/ Business per
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Market environment ThyssenKrupp sTa
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Business performance In fiscal 2007
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innovaTive maTerials New applicatio
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03 Employees services In our servic
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Employees ThyssenKrupp sTainless aG
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ThyssenKrupp sTainless aG Employees
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04 Capital expenditures compeTiTive
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Page 31 and 32: The construction of the ThyssenKrup
Page 33 and 34: 05 Research and development maTeria
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Page 37 and 38: ThyssenKrupp sTainless aG Research
Page 39 and 40: 06 Sustainability/ Environmental pr
Page 41 and 42: Sustainability ThyssenKrupp Stainle
Page 43 and 44: Environmental protection ThyssenKru
Page 45 and 46: 07 Operating companies/ Further inf
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