Spalling degradation of Cr2O3-Al2O3-ZrO2 refractories for coal-water slurry gasifier linings: Role of phosphatewww

Two kinds of high chromia bricks with and without phosphate as gasifier linings were postmortem analyzed during their whole service life. The effect of phosphate on the microstructure and phase composition of refractory sections was analyzed. The dense phosphate enrichment layer was observed between the slag penetration layer and the virgin layer, which was considered to reduce the damage of gasifier lining caused by spalling. Phosphate could decompose and migrate slowly under suitable temperature gradient existing in the bricks in service, which would result in the densification of the microstructure earlier than slag penetration. The phosphate in high chromia bricks reduced frequency of spalling due to penetration, which would lead to the lower early wear rate and longer lifetime.

Automated summary

Two types of high chromia bricks, one with phosphate and one without phosphate, were analyzed throughout their service life. The effect of phosphate on the microstructure and phase composition of the refractory sections was studied. It was found that the presence of phosphate resulted in the formation of a dense phosphate enrichment layer, which reduced damage caused by slag penetration, leading to lower wear rates and longer lifespan.