Numerical Simulation Of Gasification Process With 2000t/d Two-stage Dry Pulverized Coal Gasifier

The Integrated Gasification Steam Gas Combined Cycle?IGCC?is a highly efficient clean coal utilization technology,and the gas bed gasifier is an important part of coal clean use.In this paper,an industrial type 2000t/d two-stage dry coal gasifier is used as the research object to carry on the numerical simulation,and carries on the comparison with the actual operation data collected in the DCS system of the power station centralized control room.The main contents of this paper are as follows:In this thesis,a mathematical model of computational fluid dynamics?CFD?for dry coal pulverization is established.Among them,the k-?model can be realized by gas phase turbulence.The particle tracing model is used to analyze the flow rate model.The gas phase turbulence reaction is represented by the vortex dissipation concept model?EDC?.The coke reaction adopts the multi-step surface reaction model,and the P1 model is used for the radiation transmission.The gasification process on the KIER small gasification test furnace?1t/d?was numerically simulated and the error of the volume fraction of the main gas CO,CO₂,H₂ and the experimental data was within 5%.The model can simulate the gasification process in the reaction furnace.Then,the above model was applied to a 2000t/d two-stage dry pulverized coal gasifier,and two different working conditions under low load?65%?and high load?95%?were simulated to study the next Reaction zone and the reaction zone of the second reaction zone.The simulation results show that the error of the temperature of the nozzle,the yield of the effective gas CO and H₂ is within 10%of the operating data,and the actual gas The gasification process in the furnace;the reaction of the burner in the second stage reaction zone has little effect on the reaction zone,and the reaction product is mainly CO in the lower part of the shrinkage section.The hypoxic environment of the second reaction zone is more beneficial to the gasification reaction,followed by CO+H₂O gasification reaction and C+H₂O gasification reaction,CO volume fraction decreased first and then increased.