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Title: Modeling Slag Penetration and Refractory Degradation Using the Finite Element Method

Abstract

Refractory degradation due to slag penetration can significantly reduce the service life of gasifier refractory linings. This paper describes a modeling approach that was developed to predict refractory spalling as a function of operating temperature, coal feedstock and refractory type. The model simulates the coupled thermal, diffusion, and mechanical interactions of coal slag with refractory ceramics. The heat transfer and slag diffusion solutions are directly coupled through a temperature-dependent effective diffusivity for slag penetration. The effective diffusivity is defined from slag penetration tests conducted in our laboratories on specific coal slag and refractory combinations. Chemically-induced swelling of the refractory and the build-up of mechanical stresses are functions of the slag penetration. The model results are compared with analytical spalling models and validated by experimental data in order to develop an efficient refractory degradation model for implementation in a systems level gasifier model. The ultimate goal of our research is to provide a tool that will help optimize gasifier performance by balancing conversion efficiency with refractory life.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
979857
Report Number(s):
PNNL-SA-61905
TRN: US201011%%426
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: The Twenty-Fifth Annual International Pittsburgh Coal Conference, Pittsburgh, PA, September 29 - October 2, 2008, 3:1687-1701
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CERAMICS; COAL; DIFFUSION; EFFICIENCY; FINITE ELEMENT METHOD; HEAT TRANSFER; IMPLEMENTATION; LINERS; PERFORMANCE; SERVICE LIFE; SIMULATION; SLAGS; STRESSES; SWELLING; coal gasification, finite element method, refractory degradation

Citation Formats

Johnson, Kenneth I, Williford, Ralph E, Matyas, Josef, Pilli, Siva Prasad, Sundaram, S K, and Korolev, Vladimir N. Modeling Slag Penetration and Refractory Degradation Using the Finite Element Method. United States: N. p., 2008. Web.
Johnson, Kenneth I, Williford, Ralph E, Matyas, Josef, Pilli, Siva Prasad, Sundaram, S K, & Korolev, Vladimir N. Modeling Slag Penetration and Refractory Degradation Using the Finite Element Method. United States.
Johnson, Kenneth I, Williford, Ralph E, Matyas, Josef, Pilli, Siva Prasad, Sundaram, S K, and Korolev, Vladimir N. 2008. "Modeling Slag Penetration and Refractory Degradation Using the Finite Element Method". United States.
@article{osti_979857,
title = {Modeling Slag Penetration and Refractory Degradation Using the Finite Element Method},
author = {Johnson, Kenneth I and Williford, Ralph E and Matyas, Josef and Pilli, Siva Prasad and Sundaram, S K and Korolev, Vladimir N},
abstractNote = {Refractory degradation due to slag penetration can significantly reduce the service life of gasifier refractory linings. This paper describes a modeling approach that was developed to predict refractory spalling as a function of operating temperature, coal feedstock and refractory type. The model simulates the coupled thermal, diffusion, and mechanical interactions of coal slag with refractory ceramics. The heat transfer and slag diffusion solutions are directly coupled through a temperature-dependent effective diffusivity for slag penetration. The effective diffusivity is defined from slag penetration tests conducted in our laboratories on specific coal slag and refractory combinations. Chemically-induced swelling of the refractory and the build-up of mechanical stresses are functions of the slag penetration. The model results are compared with analytical spalling models and validated by experimental data in order to develop an efficient refractory degradation model for implementation in a systems level gasifier model. The ultimate goal of our research is to provide a tool that will help optimize gasifier performance by balancing conversion efficiency with refractory life.},
doi = {},
url = {https://www.osti.gov/biblio/979857}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2008},
month = {Mon Sep 01 00:00:00 EDT 2008}
}

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