Experimental Study And Numerical Simulation Of Coal Catalytic Gasification Process

Syngas is an important intermediate gas for chemical reactions.There are many downstream products prepared from syngas as raw materials and the economic benefits are good.Therefore,exploring the preparation of new synthesis gas has far-reaching significance for the preparation of synthesis gas.Coal catalytic gasification technology is a promising new gasification technology,and its catalyst can be used as a heat carrier and oxygen carrier for gasification reaction.At present,the technology of catalytic gasification of solid fuels based on coal is still in the research stage.The design and operation of the reactor,the performance of the catalyst and the gas-solid flow characteristics in the reactor are all to be further explored.In this paper,the combination of experimental and numerical simulation is used to study the catalytic gasification technology of coal.In this paper,Fe2O3 was used as a catalyst and water vapor was used as a gasification agent.A fluidized bed reactor was used to conduct a pilot study on the catalytic gasification process of Ningdong coal.The experimental research on the influence of operating conditions such as O/C mole rate,water vapor volume and gasification temperature on gasification performance is carried out.The results show that when the temperature is 900?,the O/C mole rate is 0.5:1 and the water vapor flow is 1.8 mL/min,the outlet syngas content reaches a maximum of 71%and the carbon conversion rate is 84%.When the water vapor flow at 2.2 ml/min,the gasification efficiency reached a maximum of 62%.Based on the pilot study of coal-catalyzed gasification in laboratory fluidized bed reactor,the numerical simulation of the catalytic gasification process of coal was carried out.A numerical model was established according to the reactor of the pilot study and a chemical reaction model was established:the coal volatilization adopts a two-step competitive reaction;the coal coke gasification reaction uses a finite rate model;the water gas conversion reaction and the machination reaction are limited.Rate/vortex dissipation model;the reduction reaction of Fe2O3 catalyst adopts the spherical shrinkage nucleus(SCM)model.The results show that when the O/C molar ratio is 0.5:1,the water vapor flow rate is 2.2mL/min,and the gasification temperature is 900?,the output syngas content reaches the maximum value of 70%,Compared with the experimental results,the error range is within 2%.Comparing the experimental results with the simulated values,it can be seen that the gas-solid flow and chemical reaction models constructed by the simulation can accurately predict the characteristics of coal catalytic gasification in the fluidized bed fuel reactor and effectively supplement and expand the experimental research.It provides powerful technical support and guidance for the amplification design of the reactor and the optimization of operating parameters.