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Abstract
This work studied generation of producer gas using oxygen-enriched air and steam mixture as gasifying medium. Corn residues consisting of cobs and stover were used as biomass feedstock. Both corn residues were pelletized and gasified separately with normal air, oxygen enriched air and steam mixture in a fixed bed reactor. Effects of oxygen concentration in enriched air (21-50%), equivalence ratio (0.15-0.35), and steam to biomass ratio (0-0.8) on the yield of product gas, the combustible gas composition such as H2, CO, and CH4, the lower heating value (LHV), and the gasification efficiency were investigated. It was found that the decrease in nitrogen dilution in oxygen enriched air increased proportion of combustible gas components, improved the LHV of producer gas, but gasification efficiency was not affected. The increase in equivalence ratio favoured high product gas yield but decreased combustible gas components and LHV. It was also observed that introduction of steam enhanced H2 production but excessive steam degraded fuel gas quality and decreased gasification efficiency. The highest gasification efficiency of each oxygen concentration was at equivalence ratio of 0.3 and steam to biomass ratio of 0.58 for cob, and 0.22 and 0.68 for stover, respectively. ©2019. CBIORE-IJRED. All rights reserved
Highlights
Most common method of gasification is using air as reacting agent
The experimental result showed that the enrichment of air made it possible to increase the gasification efficiency from 54 to 68% and the lower heating value (LHV) of the gas from 5 to 9.3 MJ/m3, while reaching maximum carbon conversion of 97%
The gas production increased with equivalence ratio (ER) and steam-tobiomass ratio (SB), while decreased with oxygen content (OC)
Summary
Most common method of gasification is using air as reacting agent This method is straight forward and very simple, requiring less capital and operating cost (Tippayawong et al, 2011; 2013). Lv et al (2004) studied the characteristics of biomass air- steam gasification in a fluidized bed. Compared with biomass air gasification, the introduction of steam greatly improved heating value (from 6.7 to 9.1 MJ/m3), gas yield and carbon conversion efficiency. Campoy et al (2009) studied the effect of oxygen in the gasification agent by enriched air- steam biomass gasification in a fluidized bed gasifier. The experimental result showed that the enrichment of air made it possible to increase the gasification efficiency from 54 to 68% and the LHV of the gas from 5 to 9.3 MJ/m3, while reaching maximum carbon conversion of 97%
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