Steam Oxidation and Chromia Evaporation in Ultra-Supercritical Steam Boilers and Turbines

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Description

U.S. Department of Energy’s goals include power generation from coal at 60% efficiency, which requires steam conditions of up to 760 °C and 340 atm, so-called ultra-supercritical (USC) conditions. Evaporation of protective chromia scales is expected to be a primary corrosion mechanism. A methodology to calculate Cr evaporation rates from chromia scales was developed and combined with Cr diffusion calculations within the alloy (with a constant flux of Cr leaving the alloy from evaporation) to predict Cr concentration profiles and to predict the time until breakaway oxidation. At the highest temperatures and pressures, the time until breakaway oxidation was predicted ... continued below

Physical Description

156-159

Creation Information

Holcomb, Gordon H. January 1, 2009.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this article can be viewed below.

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  • National Energy Technology Laboratory (U.S.)
    Publisher Info: National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States); In-house Research
    Place of Publication: Pittsburgh, Pennsylvania

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Description

U.S. Department of Energy’s goals include power generation from coal at 60% efficiency, which requires steam conditions of up to 760 °C and 340 atm, so-called ultra-supercritical (USC) conditions. Evaporation of protective chromia scales is expected to be a primary corrosion mechanism. A methodology to calculate Cr evaporation rates from chromia scales was developed and combined with Cr diffusion calculations within the alloy (with a constant flux of Cr leaving the alloy from evaporation) to predict Cr concentration profiles and to predict the time until breakaway oxidation. At the highest temperatures and pressures, the time until breakaway oxidation was predicted to be quite short for the turbine blade, and of concern within the steam pipe and the higher temperature portions of the superheater tube. Alloy additions such as Ti may allow for a reduction in evaporation rate with time, mitigating the deleterious effects of chromia evaporation.

Physical Description

156-159

Source

  • Journal Name: Journal of the Electrochemical Society; Journal Volume: 156; Journal Issue: 9

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  • Report No.: NETL-TPR-3099
  • Report No.: ORD-09-220682-1
  • Grant Number: NONE
  • Office of Scientific & Technical Information Report Number: 1009428
  • Archival Resource Key: ark:/67531/metadc840025

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Creation Date

  • January 1, 2009

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

Description Last Updated

  • June 8, 2016, 12:23 p.m.

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Holcomb, Gordon H. Steam Oxidation and Chromia Evaporation in Ultra-Supercritical Steam Boilers and Turbines, article, January 1, 2009; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc840025/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.