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Finite element (FE) computations have been performed to analyze the thermo-chemo-mechanical behavior of SiC-based refractory parts in linings used in waste-to-energy plants. These parts are in contact on one side with smoke and ashes at high temperature, and on the other side with the pressurized vapor pipe. Three multi-layered lining designs have been studied: two with tiles and one with a concrete panel. A coupled model taking into account the transport of dioxygen in the gas through the porosity, the reaction of dioxygen in contact with silicon carbide particles and the formation of solid components gradually clogging the pores, has been implemented in the finite element code ABAQUS ® . These phenomena affect the mass diffusion rate of dioxygen through the refractory layer and induce a macroscopic swelling of the material. The analysis of the numerical results allows for a better understanding of the influence of the lining design and the nature of the ceramics on the lifespan of such refractory parts. [ABSTRACT FROM AUTHOR]

Highlights: [•] The goal is the prediction of shape of SiC-based refractory part after long term oxidation. [•] The model takes into account oxygen diffusion through porosity and reaction with SiC grains in matrix. [•] The model takes into account the clogs of the porosity network. [•] The mechanical behaviour account for the local expansion induced by oxidation. [•] A long term oxidation test under thermal gradient was performed. [•] There is a good agreement between final experimental shape and numerical prediction. [Copyright &y& Elsevier]