Experimental and numerical study of steam gasification of a single charcoal particle
- CIRAD-Foret, UPR 42 Biomasse Energie, TA 10/16, 73 Rue JF Breton, 34398 Montpellier Cedex 5 (France)
- LAEGO-ENSG-INPL, Rue du Doyen Marcel Roubault, BP 40, 54501 Vandoeuvre-les-Nancy (France)
- LGPSD, UMR 2392 CNRS, Ecole des Mines d'Albi-Carmaux, Route de Teillet, 81013 Albi CT Cedex 09 (France)
The present work deals with a study coupling experiments and modeling of charcoal gasification by steam at large particle scale. A reliable set of experiments was first established using a specially developed 'macro-TG' apparatus where a particle was suspended and continuously weighed during its gasification. The main control parameters of a fixed-bed process were modified separately: steam gasification of beech charcoal spheres of different diameters (10 to 30 mm) was studied at different temperatures (830 to 1030{sup o}C), different steam partial pressures (0.1 to 0.4 atm H{sub 2}O), and different gas velocities around the particle (0.09 to 0.30 m/s). Simulations with the particle model were performed for each case. Confrontations with experimental data indicate that the model predictions are both qualitatively and quantitatively satisfactory, with an accuracy of 7%, until 60% of conversion, despite the fact that the phenomena of reactive surface evolution and particle fracturing are not well understood. Anisotropy and peripheral fragmentation make the end of the process difficult to simulate. Finally, an analysis of the thermochemical situation is proposed: it is demonstrated that the usual homogeneous or shrinking core particle models are not satisfying and that only the assumption of thermal equilibrium between the particle and the surrounding gas is valid for a model at bed scale. (author)
- OSTI ID:
- 20727293
- Journal Information:
- Combustion and Flame, Vol. 145, Issue 1-2; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
Similar Records
CFD Simulations of a Regenerative Process for Carbon Dioxide Capture in Advanced Gasification Based Power Systems
Integrated Biomass Gasification with Catalytic Partial Oxidation for Selective Tar Conversion