Chemical Looping Gasification of Charcoal with Iron-Based Oxygen Carriers in an Annular Dual-Tube Moving Bed Reactor

Charcoal used as solid fuel for chemical looping gasification (CLG) with Fe_2O_3/Al_2O_3 oxygen carriers was investigated in an annular dual-tube moving bed reactor (ADMBR). Pure CO_2 and steam/CO_2 mixture were used to gasify the charcoal in a fixed bed reactor. More combustible gases, CO and H_2, were observed in the outlet gas streams for charcoal gasification conducted with steam/CO_2 mixture than those with only CO_2. The yields of fuel gases were determined to modify the equation of oxygen carrier-to-fuel ratio (ϕ) for moving bed operation. More CO and H_2 were generated for charcoal gasification conducted in the moving bed reactor operated with higher oxygen carrier-to-fuel ratios. The heat demand for experiment conducted in the ADMBR was calculated to be 60% of output processing capacity due to the heat consumptions of fuel gasification. In sum, ADMBR is technically feasible to be a fuel reactor for partial oxidization of charcoal by CLG to achieve syngas production under appropriate operating conditions without auxiliary fuel.

並列關鍵字

Chemical looping gasification (CLG) ； Char gasification ； Fe_2O_3/Al_2O_3 composite oxygen carrier ； Moving bed reactor.

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