CFD Simulation of an Entrained-Flow Coal Gasifier for Coal IGCC Process

摘要

Coal gasifier is a key process to produce a high-quality gas inrnIntegrated-coal Gasification Combined-Cycle (IGCC) plants. Thernentrained-flow coal gasifier has been widely used in IGCC plants duernto the high gasification rate achievement and a relatively clean gasrnproduction.rnIn this study, a three-dimensional Computational Fluid Dynamicsrn(CFD) model is developed to predict the performance of coalrngasification in an entrained-flow gasifier using a CFD code, Fluentrn(Fluent, Inc., Lebanon, NH). The kinetic model is built by dividing therncoal gasification into sub-models such as pyrolysis, char gasification,rnand gas phase reactions. The discrete phase model (DPM) is used tornexamine the behavior of coal particles inside the gasifier. Carbonrncombustion and char gasification are taken into account by using thernMultiple Surfaces Reaction (MSR) model, and the gas phase reactionsrnare considered as the Turbulent Reacting Flow (TRF) model.rnThe simulation results provide the detailed information about the flowrnfield, temperature and species concentration distributions inside anrnentrained-flow gasifier including dry-feed and slurry-feed types. Thernnumerical results of the CFD simulation are compared to thernexperimental data from published works.