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Title: Understanding Corrosion Mechanisms in Oxy-Fired Systems

Abstract

Replacing air with oxygen in coal-fired boilers (i.e. oxy-firing) combined with flue gas recirculation is a leading strategy to concentrate CO{sub 2} and assist in carbon capture and sequestration. A significant area of concern is the fireside corrosion with oxy-firing due to the higher CO{sub 2} levels in the combustion gas and potentially higher SO{sub x} and H{sub 2}O levels. In order to investigate this complicated issue, laboratory experiments are being conducted with and without synthetic ash to assess the potential effect of oxy-firing on fireside corrosion rates. The initial results of this project focus on commercial and model Fe-base alloys at 600 C. Without ash, a 50%H{sub 2}O-50%(CO{sub 2}-0.15O{sub 2}) environment was the most aggressive condition, requiring higher Cr contents than 100% H{sub 2}O or Ar-50%CO{sub 2}. With the specimens covered in ash, several gas compositions were examined, including different levels of H{sub 2}O and SO{sub 2} to simulate various oxy-firing strategies. Results also are presented for several laser-clad coating compositions for protecting tubes. An additional task is examining the effect of environment on mechanical properties. Initial work studied Ni-base alloys in steam at 800 C and found little effect of steam on the creep rupture life of alloymore » 230 but a 35% decrease for alloy 740.« less

Authors:
 [1];  [1];  [2]
  1. ORNL
  2. Tennessee Technological University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
FE USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
1036570
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 25th Annual Conference on Fossil Energy Materials, Portland, OR, USA, 20110426, 20110428
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; AIR; ALLOYS; BOILERS; CARBON; COATINGS; COMBUSTION; CORROSION; CREEP; FLUE GAS; MECHANICAL PROPERTIES; OXYGEN; RUPTURES; STEAM; oxy-firing; fireside corrosion; coatings

Citation Formats

Pint, Bruce A, Dryepondt, Sebastien N, and Zhang, Ying. Understanding Corrosion Mechanisms in Oxy-Fired Systems. United States: N. p., 2011. Web.
Pint, Bruce A, Dryepondt, Sebastien N, & Zhang, Ying. Understanding Corrosion Mechanisms in Oxy-Fired Systems. United States.
Pint, Bruce A, Dryepondt, Sebastien N, and Zhang, Ying. Sat . "Understanding Corrosion Mechanisms in Oxy-Fired Systems". United States.
@article{osti_1036570,
title = {Understanding Corrosion Mechanisms in Oxy-Fired Systems},
author = {Pint, Bruce A and Dryepondt, Sebastien N and Zhang, Ying},
abstractNote = {Replacing air with oxygen in coal-fired boilers (i.e. oxy-firing) combined with flue gas recirculation is a leading strategy to concentrate CO{sub 2} and assist in carbon capture and sequestration. A significant area of concern is the fireside corrosion with oxy-firing due to the higher CO{sub 2} levels in the combustion gas and potentially higher SO{sub x} and H{sub 2}O levels. In order to investigate this complicated issue, laboratory experiments are being conducted with and without synthetic ash to assess the potential effect of oxy-firing on fireside corrosion rates. The initial results of this project focus on commercial and model Fe-base alloys at 600 C. Without ash, a 50%H{sub 2}O-50%(CO{sub 2}-0.15O{sub 2}) environment was the most aggressive condition, requiring higher Cr contents than 100% H{sub 2}O or Ar-50%CO{sub 2}. With the specimens covered in ash, several gas compositions were examined, including different levels of H{sub 2}O and SO{sub 2} to simulate various oxy-firing strategies. Results also are presented for several laser-clad coating compositions for protecting tubes. An additional task is examining the effect of environment on mechanical properties. Initial work studied Ni-base alloys in steam at 800 C and found little effect of steam on the creep rupture life of alloy 230 but a 35% decrease for alloy 740.},
doi = {},
url = {https://www.osti.gov/biblio/1036570}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {1}
}

Conference:
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