On the intrinsic reaction rate of biomass char gasification with carbon dioxide and steam

• Published in: Fuel (Guildford) Vol. 84; no. 7; pp. 885 - 892
• Main Authors: Klose, Wolfgang, Wölki, Michael
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2005; Elsevier
• Subjects: Applied sciences; Biomass; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fuels; Intrinsic reaction rate; Natural energy; Reactive surface area; Temperature-programmed desorption; Intrinsic reaction rate; Biomass; Reactive surface area; Temperature-programmed desorption; Particle size; Flow rate; Wood; Carbon dioxide; Water vapor; Reaction rate; Palm oil; Char; Gasification; Surface area
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2004.11.016

The gasification of beech wood char and oil palm shell char with carbon dioxide and steam was studied. To avoid heat and mass transport limitations during gasification, the amount of char, particle size and flow rate were varied in isothermal experiments. A rate expression of the Langmuir–Hinshelwood-type was applied to match the experimental data at different partial pressures and reaction temperatures in the intrinsic regime. Furthermore, the reactive surface area (RSA) of the biomass chars was determined as a function of the degree of conversion by the temperature-programmed desorption technique (TPD). The results show that the reaction rate is in general proportional to the RSA. The surface related reaction rates for the studied biomass chars are comparable to surface related reaction rates for coal chars at similar reaction temperatures.