Refractory Degradation by Slag Attack in Coal Gasification

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 deg C at log(Po2) = -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 VOx 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.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2009
Accession Number
ADA538367

Entities

People

  • James M Bennett
  • Jinichiro Nakano
  • Kyei-sing Kwong
  • Sridhar Seetharaman
  • Tyler Moss

Organizations

  • United States Department of Energy

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Chemistry
  • Corrosion Resistance
  • Degradation
  • Electron Microscopy
  • Grain Boundaries
  • Heat Treatment
  • Materials
  • Metals
  • Microscopes
  • Microstructure
  • Particle Size
  • Particles
  • Physical Properties
  • Refractory Materials
  • Substrates
  • Temperature Gradients

Fields of Study

  • Materials science

Readers

  • Data Mining and Knowledge Discovery.
  • Polymer Science and Engineering.
  • Powder metallurgy of Titanium alloys.