Reaction characteristic of the coke catalytic gasification with steam
The catalytic gasification of coke with steam was studied by using spent base catalysts as gasifi-cation raw material.On the premise of eliminating the influence of internal and external diffusion,the per-formance of gasification temperature,influent steam,gas mixture ratios and gasification time on the catalyt-ic gasification of coke steam were discussed.The results show that the reaction rate of coke catalytic gasi-fication on the base catalyst is proportional to gasification reaction temperature,and the effect of water va-por diffusion on the coke catalytic gasification can be basically eliminated,when the rate of inlet steam is 2.5 L/min.The conversion rate of coke on the alkaline reagent tends to be stable basically.The gasifica-tion reaction time is at least 30 min to achieve a better conversion of coke on the base spent catalyst.The product gasismainly composed of H2(approximately60%).Steam/oxygen gasification reagent isused in the gasification reaction,which could obviously improve the conversion rate of the coke,and meanwhile af-fect the composition of synthesis gas.The content of H2 and CO in syngas decreased,while the content of CO2 increased.
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