The effect of process variable on the production of hydrogen-rich gas from glucose by supercritical water gasification in an inclined tubular reactor

Title
The effect of process variable on the production of hydrogen-rich gas from glucose by supercritical water gasification in an inclined tubular reactor
Authors
수산티김재훈
Issue Date
2011-08
Publisher
Supergreen 2011
Abstract
Hydrogen as a secondary energy carrier can be produced from various renewable and unrenewable feedstocks. In particular, biomass is considered as a potential source of hydrogen since it is renewable and highly abundant in quantity. The lignocellulosic biomass which consists of cellulose, hemicellulose and lignin is often modeled with D-glucose because it is found in the decomposition or solvolysis study of cellulose and hemicellulose. In this research, glucose is used as a model compound of biomass gasified in supercritical water. The reforming in supercritical water offers great advantages for production of hydrogen-rich gas. The homogenous phase of organic, gas produced and water eliminate the mass transfer barrier. This enables to conduct the reaction at short time with compact reactor and subsequent unit because of the high pressure operation. It is also possible to conduct experiments in the absence of catalyst by optimizing the operating condition for high yield of product by eliminating coke/tar production. In this experiment the effects of temperature, residence time and concentration are investigated. The inclined tubular reactor is used as the supercritical water gasifier. The reactor was positioning 75° from vertical position with additional of air-cooled tube for gradual decrease of temperature. It was proved that this particular reactor design had high performance in the gasification of isooctane in our previous study. In this research temperature are investigated from 600 to 766℃, residence time from 15 to 60 s and concentration from 1.8-15 wt%. The hydrogen yield was almost reached the theoretical value at 766℃, 25 MPa, 1.8 wt% and 60 s residence time, which is 11.5 mol H2/mol glucose (theoretical value: 12 mol H2/mol glucose). Beside hydrogen (50-78%), carbon dioxide (20-40%) and methane (2-6%) are produced as major gases while carbon dioxide and C2+ are produced in minor quantity.
URI
http://pubs.kist.re.kr/handle/201004/40271
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KIST Publication > Conference Paper
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