Abstract
Chemical-looping combustion (CLC) is a novel technology with the feature of CO2 inherent separation in which the fuel is converted via lattice oxygen (instead of gaseous oxygen) provided by the oxygen carrier that circulates between two structurally interconnected but atmosphere-isolated reactors, i.e., fuel reactor and air reactor. In the fuel reactor of in situ gasification CLC (iG-CLC), the pyrolysis and gasification products of coal are oxidized by lattice oxygen in the O2-free environment. Therefore, the characteristics of sulfur species evolution and distribution in the coal pyrolysis products are significantly different from those in the conventional combustion, gasification, and pyrolysis processes. In this study, a two-stage fluidized bed reactor was utilized to investigate the reaction between the oxygen carrier and in situ coal pyrolysis products, in which the coal and oxygen carrier particles are separately loaded in two reactors. In this way, the influence of oxygen carrier on the coal pyroly...
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