Synergistic Catalysis Of Red Mud And Distiller's Grains On Coal Gasification

The co-gasification of coal and biomass to produce hydrogen-rich synthesis gas is a research hotspot in the field of efficient and clean utilization of coal and biomass.In order to improve the gasification efficiency,it is usually necessary to add a catalyst to improve the gasification activity and hydrogen production efficiency.On the other hand,CO₂ resources Chemical utilization is also a matter of widespread concern in the current scientific community.This research uses Guizhou’s local characteristic resources anthracite（Coal）,solid waste Bayer red mud（RM）and spirit-based distillers’grains（SDG）as raw materials,using a fixed-bed reactor to study The co-gasification reaction characteristics and synergistic effect mechanism of RM,SDG and Coal in different gasification agent atmospheres（H₂O,CO₂ and H₂O/CO₂）are discussed.The main contents and conclusions of the research are as follows:（1）The reaction characteristics of RM,SDG and Coal co-gasification under different material ratios were investigated in a steam atmosphere.Research on gasification reaction activity shows that adding RM can increase the rate of gasification reaction.Research on the synergy factor found that when RM and SDG play a catalytic role together,the final catalytic efficiency is not the weighted average of the respective catalytic efficiencies,but the two components The result of synergistic catalysis.（2）The synergistic effect mechanism of RM and SDG on coal steam gasification was studied using a two-stage fixed-bed reactor.The results showed that the synergistic effect was due to the fact that the Fe,K,and Ca in RM and SDG would change during the gasification reaction.The formation of uniformly dispersed molten microspheres,these eutectics containing catalytically active components will catalyze the water gas shift reaction to improve gasification activity and H₂ yield,but at the same time will also lead to an increase in CO₂ yield.（3）The reaction characteristics of co-gasification under H₂O/CO₂ mixed atmosphere were investigated,and it was found that the instantaneous release rate of H₂ during H₂O/CO₂ co-gasification was much higher than the sum of the instantaneous release rates when H₂O and CO₂ gasification agent were used alone.This shows that H₂O/CO₂ co-gasification has a synergistic effect.At the same time,RM and SDG in the H₂O/CO₂ mixed atmosphere still show a synergistic catalytic effect on the gasification reaction.（4）Using a fixed bed reactor to study the reaction characteristics and synergy mechanism of H₂O/CO₂ co-gasification with different gasification agent composition.The results show that the synergistic effect of H₂O/CO₂ on the gasification reaction promotes the steam gasification reaction and the water-gas shift reaction,thereby increasing the H₂ production.At the same time,the synergistic effect also promotes Boudouard reaction and methanation reaction.