Abstract
The current study focuses on the analysis of sessile-drop interfacial reactions between two synthetic slags (based on average ash chemistries of coal and petcoke feedstock) and two refractory materials (90 wt% Cr2O 3-10 wt% Al2O3 and 100 wt% Al2O 3), using a Confocal Scanning Laser Microscope (CSLM). Ground slag samples (less than 325 mesh) were placed at specific microstructure locations on refractory substrates and heated to 1500°C in an atmosphere of CO/CO 2 gas mixture (volume ratio = 1.8), using a gold-image 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 which promoted spalling of the refractory. Initially, the slag attacked both grain boundaries and fine microstructure areas, freeing alumina grains into the slag. The formation of VOx-based crystalline material in the petcoke slag was found to alter the liquid composition. Chemical spalling of Cr-containing crystal layer also facilitated degradation of the refractory.
Original language | English (US) |
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Pages (from-to) | 4595-4604 |
Number of pages | 10 |
Journal | International Journal of Hydrogen Energy |
Volume | 36 |
Issue number | 7 |
DOIs | |
State | Published - Apr 2011 |
Externally published | Yes |
Keywords
- Al O
- Coal
- CrO
- Integrated gasification combined cycle (IGCC)
- Petcoke
- Refractory
- Slag
- Vanadium oxide
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology