The Experimental Research Of Biomass Thermo-chemical Conversion Process With Fe/CaO Catalyst

Currently,fossil fuel shortage,rising oil price and global demand for energy make alternative energy more and more important in the position of national economy.Compared with other alternative energy,biomass energy has advantages of renewable,less pollution and rich reserve.Biomass liquid fuel produced by thermal-chemical conversion method（namely syngas platform）can improve production rate and efficiency,which has well process efficiency.CO₂ removal,liquid macromolecular deep conversion and H₂/CO ratio adjustment problems in product gas should be solved in order to prepare high q uality syngas,and thus,Fe was introduced into CaO to build a Fe/CaO composite system,and CO₂ removal and liquid macromolecular deep conversion at 550℃⁷00℃ during biomass thermal-chemical conversion process were studied in this paper.Product gas composition adjustment and liquid macromolecular conversion process that influenced by CaO absorbing CO₂ at 550℃⁷00℃ were studied,and conclusions are: H₂ O and CO reaction equilibrium was moved and product gas composition was changed by CaO absorbing CO₂,and the highest H₂/CO is 4.56.Fe/CaO was found to significantly improve gas quality and promote liquid macromolecular conversion when Fe was introduced into CaO.Different temperatures and different Fe contents of Fe/CaO catalyst were studied in this paper,and conclusions are: with Fe-10% catalyst at 650℃,the H₂/CO rate of catalytic pyrolysis gas is 5.16,the gas density is 0.48g/L,and the gas caloric value is 19.21MJ/Nm³;Liquid macromolecular conversion has a good result.Biomass pyrolysis model and catalytic pyrolysis model were established based on Aspen Plus and used to simulate the process of biomass pyrolysis.Compare simulation results with experiment results produced by fixed bed and draw a conclusion:Aspen Plus is appropriate to simulate the biomass pyrolysis process,experiment results agreed to simulation results and simulation results could accurately reflect the biomass pyrolysis process at different temperatures: increasing temperature is helpful to improve the gas yield and decrease the solid yield;The solid yield will increase when CaO is introduced into the process of biomass pyrolysis.