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Title: Enriched hydrogen production over air and air-steam fluidized bed gasification in a bubbling fluidized bed reactor with CaO: Effects of biomass and bed material catalyst

Journal Article · · Energy Conversion and Management

Gasification is one of the methods of generating biopower or biofuels from biomass waste. In this study, a benchscale fluidized bed reactor was used for biomass air and air-steam gasification. Gasification was performed under constant operating conditions (~780 °C, equivalence ratio = ~0.32) to investigate the effect of biomass (switchgrass, pine residues) and bed materials (sand, CaO+ sand, Al2O3, and CaO + Al2O3). All gasification products, such as synthesis gas (syngas), contaminant gases, tar, and biochar (solid) were comprehensively analyzed. The composition of biomass significantly impacted CO and H2 yield from volatile combustible matter and fixed carbon. Further, the presence of CaO made the condition favorable for the water-gas shift (WGS) reaction combined with the CO2 carbonation reaction, which increased H2 concentration. Additional steam with CaO increased H2 concentration closer to 50% (N2 free condition) through the combination reactions of steam hydrocarbon reforming and WGS by producing 44 gH2/kgdry biomass and 143 gCO/kgdry biomass. The usage of steam reduced the overall yield of contaminant gases, whereas the usage of CaO or Al2O3 decreased the amount of gasification tar by approximately 5.8–6.5 gtar/kgdry biomass. In conclusion, this study can provide valuable experimental data for biomass waste to produce better quality syngas.

Research Organization:
Univ. of Tennessee, Knoxville, TN (United States); Auburn Univ., AL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); US Department of Agriculture (USDA); Korea Institute of Energy Research (KIER)
Grant/Contract Number:
EE0006639; ALA014-1-19068; C0-2422
OSTI ID:
1781059
Alternate ID(s):
OSTI ID: 1664596
Journal Information:
Energy Conversion and Management, Vol. 225; ISSN 0196-8904
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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