Effect of oxy-firing on corrosion rates at 600°-800°C

B. A. Pint, J. K. Thomson

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Using oxygen, rather than air, in coal-fired boilers is a leading strategy to reduce NOx emissions and concentrate CO2 for capture. However, with flue gas recirculation, higher levels of CO2 and possibly H 2O and SO2 are expected and there is concern that higher corrosion rates may occur. Using synthetic coal ash, the behavior of a range of ferritic, austenitic and Ni-base alloys has been investigated from 600°-800°C to cover current to advanced ultrasupercritical boiler conditions. Both commercial and model alloys indicate that the worst-case oxy-firing condition is not significantly different than air-firing using the same synthetic ash. The oxide thickness measurements focused on the highest alloyed materials. For these materials, there was not a major increase in the amount of reaction product at 700°C. The results from the binary Fe-Cr alloys indicated that 30%Cr is protective over this temperature range.

Original languageEnglish
Title of host publicationNACE International - Corrosion 2013 Conference and Expo
StatePublished - 2013
EventCorrosion 2013 - Orlando, FL, United States
Duration: Mar 17 2013Mar 21 2013

Publication series

NameNACE - International Corrosion Conference Series
ISSN (Print)0361-4409

Conference

ConferenceCorrosion 2013
Country/TerritoryUnited States
CityOrlando, FL
Period03/17/1303/21/13

Keywords

  • Boiler
  • CO
  • Coal ash corrosion
  • HO
  • High temperature oxidation

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