Refractory degradation by slag attack in coal gasification

Jinichiro Nakano, Sridhar Seetharaman, James Bennett, Kyei Sing Kwong, Tyler Moss

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

This research investigates sessile drop interfacial reactions between two refractory materials (high-chromia and alumina) and two synthetic slags (coal and petcoke). Pulverized slag samples were placed at specific microstructure locations on refractory substrates and heated to 1500 °C at log(Po 2) = -9, using a high-speed heating chamber. Cross-sections of the slag/refractory interface indicated unique slag penetration into preferred areas of the refractory and grain dissolution into the slag through a de-bonding mechanism. Initially, the slag attacked both grain boundaries and fine microstructure areas, freeing alumina grains into the slag. Crystalline VO x formation in the petcoke slag was found to alter the overall liquid composition. Chemical spallation of Cr-containing crystal layer facilitated degradation of the refractory.

Original languageEnglish (US)
Title of host publicationTMS 2009 - 138th Annual Meeting and Exhibition - Supplemental Proceedings
Pages197-204
Number of pages8
StatePublished - 2009
Externally publishedYes
EventTMS 2009 - 138th Annual Meeting and Exhibition - San Francisco, CA, United States
Duration: Feb 15 2009Feb 19 2009

Publication series

NameTMS Annual Meeting
Volume2

Other

OtherTMS 2009 - 138th Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Francisco, CA
Period2/15/092/19/09

Keywords

  • Alumina
  • Chromia
  • Coal
  • Integrated gasification combined cycle
  • Petcoke
  • Vanadium oxide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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