Std. 617. CCA617. Inconel 740. Haynes 230. Advanced Austenitic. Alloys (Super
304H,. 347HFG, NF709, etc.) Haynes 282. Average Temperature for Rupture in ...
Primary Technical Goals of US A-USC Materials Programs • Materials Technology Evaluation • Focus on nickel-based alloys • Development of fabrication and joining technology for new alloys
• Unique Conditions for US Program Considerations • Higher-temperatures than European Program (760°C versus 700°C) means additional alloys are being evaluated • Corrosion resistance for US coals • Data for ASME code acceptance of new materials • Phase II Boiler work includes Oxycombustion ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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‘Aggressive’ goals for increased steam turbine temperatures are in-line with gas turbine improvements
ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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Materials Limit the Current Technology o
Average Temperature for Rupture in 100,000 hours ( F) 1100
1200
1300
1400
500
70
Nickel-Based Alloys
Inconel 740
50
300
Age Hardenable = A-USC 760°C (1400°F)
°
30
Stress (ksi)
Stress (MPa)
Haynes 282
Std. 617
CCA617
100 80 60
40
Steels = USC 620°C (1150°F) 9-12Cr Creep-Strength Enhanced Ferritic Steels (Gr. 91, 92, 122)
550
600
Solid Soln’ = A-USC ~700°C (1300°F)
10 8
Advanced Austenitic Alloys (Super 304H, 347HFG, NF709, etc.)
650
700
Haynes 230 750
800 o
Average Temperature for Rupture in 100,000 hours ( C) ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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Minimum Desired 6 Strength at Application Temperature
Piping System Comparison: 704/704°C (1300F/1300°F)
740 Double MS &HRH
617 Double MS & HRH
ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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71mm (3inches)
740 Single MS & HRH
Highlights: World’s First Inconel®740 Pipe Extrusion • Special Metals (Huntington, WV) & Wyman-Gordon (Houston, TX) Project not consortium funded • 15-inch (381mm) O.D. X 8-inch (203mm) I.D. X 34-1/2 feet (10.4m) long • Larger forging window for Inconel 740 compared to CCA617 (same size pipe extrusion was shorter, 8.9m)
Inconel®740H Pipe after Extrusion at Wyman-Gordon ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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Cost of Electricity and CO2 Avoid Costs for USbased Coal Power Plants
Cost of Electricity ($/MWhr) or CO2 Avoided Cost ($/metric ton)
70 60 50 1100degF $/MWhr 1400degF $/MWhr CO2 avoided cost
40 30 20 10 0 EPRI
NETL
(NETL electricity costs are higher due to smaller plant size) ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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UN-PRESENTED SLIDES FOLLOWFOR ADDITIONAL INFORMATION
[email protected]
ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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A-USC Steam Turbine Highlight: Large Step Casting Produced • Research by NETL & ORNL led to selection of key turbine cast alloys for casings & valve bodies – Haynes 282 (primary) & Alloy 263 – Numerous trial plates produced for welding repair studies • Scale-up Efforts (Haynes 282) – 150 kg step casting (Manufacturer 1) – ~500 kg finished weight step casting (Manufacturer 2 )
Largest cross-section = ~300mm (12inch) cube ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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Advanced Ultrasupercritical (A-USC) Steam Boiler Highlight: A-USC + Oxycombustion Design • 1 OEM Design Completed • Air vs. Oxy. Case Considered (no capture) • Aux. Load: 5.1% Air, 27.8% Oxy. • Efficiency (HHV) drops by 9.3 points = ~21% relative drop • No major change in materials selection for Air vs. Oxy. • Future Work: – 2 other OEM designs in process Conceptual Material Layout: 730C/760C/35MPa A-USC courtesy: ALSTOM Power ASERTTI Webcast January 2013 © 2007 Electric Power Research Institute, Inc. All rights reserved.
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