298 / 2018-07-23 15:03:43

The Research On Chemical Looping Gasification Of Biomass With FeCaO As An Oxygen Carrier

全体主题 > 生物质多联产

Chemical looping gasification of biomass is one of the promising and efficient biomass gasification technologies. During the process, oxygen carrier (OC) provides lattice oxygen instead of molecular oxygen needed for gasification, and then the reduced OC is oxidized in the air atmosphere, thus the OC can be recycled. OC could play the dual role of oxygen providing and tar reforming, so the selection of the oxygen carrier is a crucial factor for chemical looping gasification of biomass. In this paper, in order to improve the oxidation and reduction of the OC and optimize the quality of the product syngas, the OCs of Fe/CaO with different concentrations were prepared by the mixing and impregnating methods for biomass chemical looping gasification. Multi techniques, such as BET, XRD, CO2-TPD and H2-TPR were performed to analyse the characterization of Fe/CaO OCs. Experiments of sawdust chemical looping gasification were performed on a fixed bed reactor. The results showed that with the same iron oxide loading, the OCs of Fe/CaO prepared by mixing method had better reactivity than that prepared by the impregnating method. And the higher concentration of –iron favored the syngas production under the reaction temperature of 850oC. Furthermore, the Mix-40%Fe/CaO was considered as the best OC during the prepared OCs, and the highest syngas yield of 453ml/g sawdust, and the yields of H2 and CO were 146.6ml and 306.8ml were achieved respectively. According to the characterization and experiment results, it can be conclude that the Fe/CaO oxygen carrier can provide oxygen for biomass gasification and reform the tars to syngas, so the quality of the product gas can be optimized.