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supercritical pressures

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Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 930-938, October 21–24, 2019,
... Abstract Direct-fired supercritical CO 2 (sCO 2 ) cycles are expected to result in sCO 2 with higher impurity levels compared to indirect-fired cycles. Prior work at ambient pressure showed minimal effects of O 2 and H 2 O additions, however, a new experimental rig has been built to have...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 844-854, October 11–14, 2016,
..., ppm levels of O2, H2O, etc.) [11-19]. A few studies have begun to look at the effect of impurities in CO2 at high temperature and pressure [20-22]. However, there are few experimental facilities 844 where impurities of 1-10%H2O and 1-3%O2 can be controlled and monitored at supercritical pressures...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 1183-1194, October 15–18, 2024,
... Abstract Supercritical carbon dioxide cooling during machining has been identified as an effective measure to mitigate the risk of stress corrosion cracking in materials utilized in the primary circuit of light water reactors, particularly in pressure vessel structural steels. This study aims...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 86-97, October 22–25, 2013,
... the fluid moves up twice through the same elevation, then a third pass continues up to the roof [6]. Exit fluid temperature reaches about 385C (725F). Enclosure circulation requires increasing pressure to 24.1 MPa (3500 psi) supercritical operation (called constant pressure) after the convection pass outlet...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 885-896, October 15–18, 2024,
... Diego, CA. 894 [12] Pint B. A., Brese, R. G., High-Temperature Materials, in Fundamentals and Applications of Supercritical Carbon Dioxide Based Power Cycles, K. Brun and P. Friedman, eds., Elsevier, London, (2017), pp.67-104. [13] Pint, B. A., Brese, R. G., Keiser, J. R., Effect of Pressure...
Proceedings Papers

AM-EPRI2004, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Fourth International Conference, 602-622, October 25–28, 2004,
... Abstract Current state-of-the-art coal-fired supercritical steam power plants operate with high-pressure turbine inlet steam temperatures close to 600°C. The best of the recently developed and commercialized advanced 9-12Cr martensitic-ferritic steels may allow prolonged use at temperatures...
Proceedings Papers

AM-EPRI2004, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Fourth International Conference, 451-462, October 25–28, 2004,
... alloys for use in USC systems, with emphasis placed on alloys for high- and intermediate-pressure turbine sections. Initial results of this research are presented. coal generation coal power plants steam temperature steam turbines ultra supercritical steamside oxidation httpsdoi.org/10.31399...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 924-930, October 11–14, 2016,
... out in a supercritical water (SCW) autoclave at 700°C/250 bar with 150 ppb dissolved oxygen in the inlet flow and a pH of 7 (measured at room temperature in the low pressure part of the recirculation loop). The test duration was up to 1000 h. The autoclave is connected to a recirculation water loop...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 254-264, October 22–25, 2013,
... Abstract Significant development is being carried out worldwide for establishing advanced ultra supercritical power plant technology which aims enhancement of plant efficiency and reduction of emissions, through increased inlet steam temperature of 750°C and pressure of 350 bar. Nickel base...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 791-802, October 22–25, 2013,
... Abstract To improve the efficiency of fossil fuel power plants the operating temperatures and pressures need to be increased. However, at high temperatures the steam side oxidation resistance becomes a critical issue for the steels used especially at the final stages of superheaters...
Proceedings Papers

AM-EPRI2004, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Fourth International Conference, 552-558, October 25–28, 2004,
... Abstract Improving power plant efficiency through supercritical steam pressures and very high steam temperatures up to 700°C and beyond is an effective approach to reducing fuel consumption and CO2 emissions. However, these extreme steam temperatures necessitate the use of nickel-base alloys...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 55-65, October 11–14, 2016,
... strength have led to increased use of thermo-mechanically processes stainless steels such as Super 304H and 347HFG, inner diameter (ID) shot peeing, and higher chromium alloys such as HR3C [2]. With respect to waterwall tubing, the concern is twofold. High supercritical pressures and the use of high heat...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 347-355, October 11–14, 2016,
... Failure Analysis, Vol. 50, (2015), pp20-28. [6] Viswanathan, R., Coleman, K. C., Materials for Ultra-Supercritical Coal-Fired Power Plant Boilers, Pressure Vessels and Piping, Vol. 83, (2006), pp778 783. 355 Copyright © 2016 ASM International. All rights reserved. 2016 ASM International ...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1215-1223, October 21–24, 2019,
... Abstract Both of high pressure main throttle valves and one governing valves were jammed during the cold start of steam turbine served for 8541 hours at 600 °C in an ultra supercritical power plant. Other potential failure mechanisms were ruled out through a process of elimination, such as low...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 460-469, October 21–24, 2019,
... Abstract Materials are the key to develop advanced ultra-supercritical (A-USC) steam generators. Operating at temperature up to 760°C and sustained pressure up to 4500 psi. Pressure vessel and piping materials may fail due to creep, oxidation, and erosion. Valves are particularly subjected...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 1268-1282, October 22–25, 2013,
... Abstract Alloy 718, widely used for its high-temperature performance in various applications, is being investigated for use in advanced power plants. Driven by the need for efficiency improvements, these plants demand higher temperatures and pressures, putting significant stress on critical...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 647-654, October 21–24, 2019,
... up to 20 000 hours. The morphology of the oxide scale and the microstructure of the bulk material were investigated. In addition, the effect of surface finish and pressure on the steam oxidation were also studied. advanced ultra-supercritical fossil power plants austenitic stainless steel...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 823-831, October 11–14, 2016,
... and ultrasonically degreased in ethanol. Exposure testing was carried out in a supercritical water (SCW) autoclave at 650°C/250 bar with 150 ppb dissolved oxygen in the inlet flow and a pH of 7 (measured at room temperature in the low pressure part of the recirculation loop). The test durations were 1200 h and 1800...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 1001-1009, October 11–14, 2016,
... Abstract The efficiency of power plants is depending on the steam temperature and/or the steam pressure. Efficiency increasing from 35% to 42-45% require increasing of the steam temperature over 600°C and the pressure over 26 MPa. According to the designer opinion it is not profitable to use...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1476-1486, October 21–24, 2019,
... of challenges for the future of coal as a sustainable and viable fuel source. Since the cycle efficiency of a steam power plant is directly related to the steam temperature and pressure, advanced ultra-supercritical (A-USC) steam cycles have the potential to improve cycle efficiency, reduce fuel costs...