Numerical Simulation of the Influence of Pressure on the Coal Gasification in a Spouted Fluidized Bed

With the aid of a CFD(Computational Fluid Dynamics) software platform,established for the first time was a three-dimensional gasification dynamic model for a spouted fluidized bed.The model included the following sub-models:those for gas-solid flow,coal volatile precipitation and coke gasification reaction,as well as a homogeneous reaction sub-model between gas phases.The model was mainly used to investigate the influence of the change of operating pressure on coal gasification.When the pressure is 0.1 MPa,the mole fractions of carbon monoxide,hydrogen and methane are 8.75%,10.5% and 3% respectively.When the pressure is 0.3 MPa,the mole fractions of the above items are 11.2%,12.81% and 4.27% respectively.The quality of coal gas was improved significantly after being pressurized.Finally,the simulation calculated results were verified by test ones.