A major impact on the economics of coal gasification is the spalling degradation of hot-face refractories in slagging coal gasifiers. Two predictive models for spalling have been previously proposed and benchmarked. Both models express molten slag ingress into the porous refractory in terms of an effective diffusivity, a formulation for which is developed in the present Communication. The results appear useful for predicting the lifetimes of refractories in slagging coal gasifiers, and for determining whether the spall originated from tensile or compressive mechanisms.
Revised: February 16, 2009 |
Published: January 8, 2008
Citation
Williford R.E., K.I. Johnson, S.K. Sundaram, and S. Pilli. 2008.Effective Diffusivity and Spalling Models for Slagging Coal Gasifiers.Journal of the American Ceramic Society 91, no. 12:4016-4022.PNNL-SA-58518.doi:10.1111/j.1551-2916.2008.02755.x