| Evaluating Ni-Based Alloys for A-USC Component Manufacturing and Use |  |  |
Project Information
| Prime Performer: | Oak Ridge National Laboratory (ORNL) (Oak Ridge, TN) | Agreement Number: | FWP-FEAA152 | |
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| Project Duration: | 10/01/2019 - 09/30/2025 | Total Award Value: | $2,315,000 | |
| Technology Area: | Advanced Energy Materials | DOE Share: | $2,315,000 | |
| Key Technology: | Advanced Materials Development | Performer Share: | $0 | |
Project Description
The objective of this project is to evaluate advanced nickel (Ni)-based alloys to support the manufacturing and use of components under advanced ultra-supercritical (A-USC) steam conditions, which range up to 760 °C (1400 °F) and 35 MPa (5000 psig). In particular, this project focuses on evaluating materials from near-to-full-scale components, such as Haynes 282 large rotor forging, half-valve body casting, and steam turbine nozzle carrier casting, to provide insights into potential manufacturability issues related to large-scale components made from Ni-based alloys and engineering data and support for actual A-USC plant design. In addition, this project contains substantial efforts in weld characterization and long-term creep testing of Ni-based alloy weldment, which should provide useful data for filler metal selection and future ASME code qualification efforts for cast Haynes 282 weldment.
Project Benefits
The bulk of the U.S. fleet of supercritical coal-fired boilers operates with maximum steam conditions of 566°C (1050 °F) and 238 bar (3450 psig), and net plant efficiencies on the order of 30-32% higher heating value (HHV). In Europe, interest in advanced steam cycles with significantly increased efficiency (and reduced emissions) resulted in the initiation of projects to produce technology capable of operation with 650°C/340 bar (1202 °F/4930 psig) steam in the COST-522 project, and 700 °C/340 bar (1292 °F/4930 psig) steam in the Thermie project. The efficiencies associated with these advanced steam conditions range up to 45% HHV, representing a reduction in emissions of approximately 28% compared to the U.S. base-case conditions. Various developments in Japan and China are now aimed at 700 °C (1292 °F) capabilities as well. Operation at higher efficiencies/lower emissions is dependent on materials capable of operating at higher temperatures. Therefore, new ferritic and austenitic steels as well as nickel alloys are being explored for use in components and processing for these high temperature and pressure applications.
Contact Information
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