Study on Chemical Looping Gasification of Biomass for Hydrogen-rich Syngas Production
In this paper,Ca2Fe2O5 oxygen carrier was prepared by sol-gel method for the produc-tion of hydrogen-rich syngas from chemical looping gasification of biomass.The results show that compared with the conventional pyrolysis and steam gasification of biomass,the synergistic effect of steam and oxygen carrier greatly improves the H2 yield and carbon conversion rate when Ca2Fe2O5 is used as oxygen carrier.The comparison of different oxygen carrier and thermodynamic analysis highlights the excellent reaction characteristics of Ca2Fe2O5 oxygen carrier.By optimizing the reac-tion conditions,the optimum reaction conditions were obtained as follows:gasification temperature 850℃,steam concentration 30％and oxygen-fuel ratio 0.2.Under this condition,the H2 yield and total gas yield were 0.91 m3/kg and 1.83 m3/kg,respectively,and the H2/CO ratio was close to 3.Finally,10 cycles of experiments and oxygen carrier characterization results show that the Ca2Fe2O5 oxygen carrier has good cycle stability,where the crystal phase and microstructure of the oxygen carrier have almost no change.
chemical looping gasificationoxygen carrierhydrogen-rich Syngas
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