Influence of Oxygen/Steam Addition on the Quality of Producer Gas during Direct (Air) Gasification of Residual Forest Biomass

Helena G. M. F. Gomes, Manuel A. A. Matos and Luís A. C. Tarelho ()
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Helena G. M. F. Gomes: Department of Environment and Planning, CESAM—Centre for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Manuel A. A. Matos: Department of Environment and Planning, CESAM—Centre for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Luís A. C. Tarelho: Department of Environment and Planning, CESAM—Centre for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal

Energies, 2023, vol. 16, issue 5, 1-20

Abstract: Biomass gasification is a relevant option to produce a gaseous fuel, it faces, however, several barriers regarding its quality for energetic applications. Therefore, in this study, air-steam and O 2 -enriched air mixtures were used as gasification agents during the gasification of residual biomass from eucalyptus to improve the producer gas quality. The steam addition promoted an increase in CO 2 and H 2 concentrations, whilst decreasing the CO and CH 4 concentrations. The steam addition had no evident impact on the lower heating value of the dry producer gas and a positive effect on gas yield and the H 2 :CO molar ratio, attaining the later values up to 1.6 mol H 2 ∙mol −1 CO . The increase in O 2 concentration in the gasification agent (φ) promoted an increase in all combustible species and CO 2 concentrations. The lower heating value of the dry producer gas underwent an increase of 57%, reaching a value of 7.5 MJ∙Nm −3 dry gas , when the φ increased from 20 to 40 %vol. O 2 , dry GA . The gas yield had a significant decrease (33%) with φ increase. This work showed that the addition of steam or O 2 during air gasification of residual biomass improved producer gas quality, overcoming some of the barriers found in conventional air gasification technology.

Keywords: bubbling fluidized bed gasifier; eucalyptus residues; hydrogen; H 2 :CO molar ratio; lower heating value (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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