| 摘要： |
Chemical Looping Gasification (CLG) is a promising technology to produce syngas from renewable biomass material without the need for upstream air separation. It has been proposed as an innovative scheme for eliminating the tar through hot gas cleaning after biomass is gasified. Lignin is the main component of biomass and the second-most abundant organic material on the planet. Also, lignin is a waste by-product from integrated bio-refineries. Four bimetallic oxygen carriers (CaFe2O4, CaMn2O4, BaFe2O4 and BaMn2O4) are systemically studied for CLG of biomass-based lignin as fuel source. Based on thermodynamic analysis and online mass spectral data, BaFe2O4 demonstrated the best ability to selectively gasify lignin and had good regeneration, which made it very attractive for potential chemical looping partial oxidation of biomass in commercial applications. All oxygen carriers studied showed the ability to be fully regenerated in the air after reduction. Adding CO2 increased production of CO due to reverse Boudouard reaction (C+ CO2 = 2CO) and accelerated both biomass conversion and reaction kinetics of the gasification process in the presence of these bimetallic oxygen carriers. |
