Simulation of fixed-bed pressurized slagging gasification process
In order to study the gasification reaction process and optimal process parameters of fixed-bed pressurized slagging gasifier,a kinetics model of the gasifier was built by Aspen Plus.Then the model was used to simulate a fixed bed pressurized slagging gasifier in Inner Mongolia.The error between the calculation results and the industrial data was less than 5％,which proved the accuracy of the model.Based on this model,the composition and temperature distribution inside the gasifier and the effects of different operation parameters on the performance of the gasifier were analyzed.The results show that the highest temperature which is near the oxygen-steam nozzle is 2 019 ℃.15％of the reaction layer in the gasifier is combustion layer,25％is the gasification layer,and 60％is the dry distillation and drying layer.With the increase of the steam-oxygen ratio,the carbon conversion rate increases and the steam decomposition rate decreases.When the steam-oxygen ratio is between 0.95-1.0,the performance of the gasifier is the best.With the increase of oxygen-coal ratio,the carbon conversion rate increases,and the steam decomposition increases firstly and then decreases.When the oxy gen-coal ratio is between 0.45-0.46,the performance of the gasifier is also the best.The results can provide a theoretical basis for the design and operation of fixed-bed pressurized slagging gasifiers.
fixed-bed pressurized slagging gasificationgasification modelreaction kineticssteam-oxygen ratiooxygen-coal ratio
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