In-situ reforming of biomass primary tars via reactive flash volatilization

Tigabwa Y. Ahmed, Andrew F.A. Hoadley and Akshat Tanksale

Renewable Energy, 2020, vol. 147, issue P1, 1180-1187

Abstract: Tar formation during biomass gasification has remained a major challenge. Using acetol and guaiacol as model tar compounds from cellulose and lignin, respectively, in-situ tar conversion into synthesis gas (H2 and CO) was studied using a Rh–Ni/Al2O3 catalyst under reactive flash volatilization conditions. The influence of operating conditions, including temperature, steam-to-carbon molar ratio (S/C), carbon-to-oxygen molar ratio (C/O), gas hourly space velocity (GHSV), and catalyst weight, on the H2/CO molar ratio in the product gas were experimentally examined. The contribution of non-catalytic thermal oxidation on overall conversion was also measured by varying the distance between the catalyst bed and the feeding point position. In the case of acetol reforming at 650 °C, more than 60% of the carbon in the feed was converted via thermal oxidation into permanent gases before reaching the catalytic bed. Moreover, a minimum reaction temperature of 500 °C was necessary to avoid coke formation and the optimal operating conditions for reforming of acetol were 650 °C, C/O = 1.7, S/C = 1.2, and atmospheric pressure. Likewise, for guaiacol, the minimum operating temperature of 600 °C was required. By using two pure components, this study has provided insight into how reactive flash volatilization generates tar-free synthesis gas.

Keywords: Reforming; Acetol; Guaiacol; Reaction kinetics; Reactive flash volatilization (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:147:y:2020:i:p1:p:1180-1187

DOI: 10.1016/j.renene.2019.09.051

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