Steam oxidation and chromia evaporation in ultrasupercritical steam boilers and turbines
Abstract
The U.S. Department of Energy's goals include power generation from coal at 60% efficiency, which requires steam conditions of up to 760 {sup o}C and 340 atm, so-called ultrasupercritical conditions. Evaporation of protective chromia scales is 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 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.
- Authors:
-
- US DOE, Albany, OR (United States)
- Publication Date:
- OSTI Identifier:
- 21222338
- Resource Type:
- Journal Article
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 156; Journal Issue: 9; Journal ID: ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 20 FOSSIL-FUELED POWER PLANTS; SUPERCRITICAL STATE; FOSSIL-FUEL POWER PLANTS; COAL; CORROSION; CHROMIUM OXIDES; SCALING; CHROMIUM; ALLOYS; OXIDATION; EVAPORATION; TURBINE BLADES; PIPES; TUBES; TITANIUM; STEAM; GAS TURBINES; BOILERS; CORROSION PROTECTION
Citation Formats
Holcomb, G R. Steam oxidation and chromia evaporation in ultrasupercritical steam boilers and turbines. United States: N. p., 2009.
Web. doi:10.1149/1.3155442.
Holcomb, G R. Steam oxidation and chromia evaporation in ultrasupercritical steam boilers and turbines. United States. https://doi.org/10.1149/1.3155442
Holcomb, G R. 2009.
"Steam oxidation and chromia evaporation in ultrasupercritical steam boilers and turbines". United States. https://doi.org/10.1149/1.3155442.
@article{osti_21222338,
title = {Steam oxidation and chromia evaporation in ultrasupercritical steam boilers and turbines},
author = {Holcomb, G R},
abstractNote = {The U.S. Department of Energy's goals include power generation from coal at 60% efficiency, which requires steam conditions of up to 760 {sup o}C and 340 atm, so-called ultrasupercritical conditions. Evaporation of protective chromia scales is 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 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.},
doi = {10.1149/1.3155442},
url = {https://www.osti.gov/biblio/21222338},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 9,
volume = 156,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 2009},
month = {Wed Jul 01 00:00:00 EDT 2009}
}