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

Category: Gasification Technology

Volume: 16 | Issue: 4 | Pages: 1093-1103
DOI: 10.4209/aaqr.2015.05.0298
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Hsuan-Chih Wu, Young Ku

  • Department of Chemical Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Rd., Da’an Dist., Taipei 106, Taiwan

Highlights

Fe2O3/Al2O3 oxygen carriers was prepared and provided with applicable performance.
A moving bed reactor was employed as fuel reactor using iron-based oxygen carriers.
More CO and H2 were generated for charcoal gasification with steam/CO2 mixture.
FeO was observed in the reacted oxygen carriers out of the reactor.
Roughly 60% of output processing capacity was released for charcoal gasification.


Abstract

Charcoal used as solid fuel for chemical looping gasification (CLG) with Fe2O3/Al2O3 oxygen carriers was investigated in an annular dual-tube moving bed reactor (ADMBR). Pure CO2 and steam/CO2 mixture were used to gasify the charcoal in a fixed bed reactor. More combustible gases, CO and H2, were observed in the outlet gas streams for charcoal gasification conducted with steam/CO2 mixture than those with only CO2. 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 H2 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.

Keywords

Chemical looping gasification (CLG) Char gasification Fe2O3/Al2O3 composite oxygen carrier Moving bed reactor


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