关键词:

数值模拟, 简化PDF, 异相反应

Abstract:

Based on commercial CFD software Fluent, numerical simulations of the coal gasification process for a Texaco gasifier was investigated with a comprehensive model, which contained several simplified sub-models.Chemical process was described with assumed PDF model.In this model, coal slurry was defined as the fuel stream, pure oxygen was defined as the oxidizer stream.According to the numerical simulation of the cold flow field, the mesh mainly composed of hexahedral structure was adopted and realizable k-ε turbulent model was used.The coupling effect between gas phase and discrete phase was considered by using Particle Source In Cell (PSIC) model.A stochastic tracking method was used to simulate turbulent dispersion of the particles.P-1 model was also adopted to include the radiation in the gasifier.Heterogeneous reactions, including carbon with O₂, H₂O, CO₂ and H₂, were considered by User Defined Functions (UDF).The comparison between the industrial performance and the prediction data showed that the model could describe the gasification process correctly.The gasification process in an industrial gasifier could be regarded as in kinetic equilibrium.

Key words:

数值模拟, 简化PDF, 异相反应