Modelling of High-Chromia Refractory Spalling in Slagging Coal Gasifiers

Journal Article · Fri Oct 31 00:00:00 EDT 2008 · Ceramics International, 34(8):2085-2089

DOI:https://doi.org/10.1016/j.ceramint.2007.08.011· OSTI ID:946385

Williford, Rick E; Johnson, Kenneth I; Sundaram, S K

The economic viability of converting coal into clean burning liquid fuels in slagging coal gasifiers is compromised by the limited service lifetime of hot-face refractories. One of the most severe refractory degradation mechanisms is spalling, which can occur by either volume expansion phenomena (compressive stresses) or by volume shrinkage phenomena (tensile stresses). A volume shrinkage model is benchmarked to high-chromia refractory material properties and performance under gasifier operating conditions. The model is found to be appropriate for first order estimates of gasifier refractory lifetime when the apparent diffusivity of volatized Cr in the refractory includes the effects of slag-filled pores and cracks.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 946385
• Report Number(s): PNNL-SA-54788
• Journal Information: Ceramics International, 34(8):2085-2089, Journal Name: Ceramics International, 34(8):2085-2089
• Country of Publication: United States
• Language: English

Related Subjects

Failure Analysis
Interfaces
Mechanical Properties
Refractories