Interactions of refractory materials with molten gasifier slags

Journal Article · Fri Apr 01 04:00:00 EDT 2011 · International Journal of Hydrogen Energy

DOI:https://doi.org/10.1016/j.ijhydene.2010.04.117· OSTI ID:1053582

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

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% Cr{sub 2}O{sub 3}–10 wt% Al{sub 2}O{sub 3} and 100 wt% Al{sub 2}O{sub 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{sub 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 VO{sub x}-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.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE Office of Fossil Energy (FE)
• DOE Contract Number: FE0004000
• OSTI ID: 1053582
• Report Number(s): TPR-3011
• Journal Information: International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: 7 Vol. 36; ISSN 0360-3199
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
10 SYNTHETIC FUELS
36 MATERIALS SCIENCE
AI{sub 2}O{sub }3
Coal
Cr{sub 2}O{sub 3}
Integrated gasification combined cycle (IGCC)
Petcoke
Refractory
Slag
Vanadium oxide