Research on corrosion mechanism of refractory lining in drip zone of COREX melting gasifier

In this paper, the COREX-3000 melting gasifier was dissected and sampled to obtain the macroscopic erosion appearance of refractories lining in the drip zone, and the erosion behavior and mechanism of refractory bricks in the drip zone were analyzed by means of chemical analysis, XRD, SEM and determination of physical characteristics. The results showed that the maximum average erosion of refractory lining bricks in the drip zone was 220 mm and the erosion rate was up to 69%. Its surface was mainly affected by slag erosion and mechanical scour of slag, but at high temperature, the surface of refractory could be re-sintered, forming a protective layer, which improved the volume density and high compressive strength of refractory, which was advantageous to the improvement of refractory brick slag resistance invasion and mechanical erosion resistance. Relevant research results can provide theoretical basis for the selection of refractories lining in the drip zone of COREX melting gasifier. (authors)