Development of a Slag Submodel for an Entrained-Flow Gasifier

摘要

In slagging gasifiers with hot wall configurations, a portion of the molten slag flows along theinner walls of the gasifier. The slag can penetrate into the gasifier refractory causing degradation.However, due to the harsh operating conditions inside such a gasifier, it is impossible to measurethe refractory degradation with current measurement technology. Therefore, a mathematicalmodel can be useful in understanding the effects of various operating conditions andphysicochemical properties on the degradation characteristics.With this incentive, a slag sub-model is being developed. This sub-model will be eventuallyintegrated with a 1D steady-state model of a single-stage, downward-firing, oxygen-blown,slurry-fed, entrained-flow gasifier previously developed at WVU using Aspen Custom Modeler?(ACM). In this paper, we have presented a model for calculating the deposition rate of thedetached slag droplets considering Illinois#6 coal as the gasifier feed. The model is then used toinvestigate the effect of the droplet size distribution on the deposition rate.