Funding: EUFP5(NNE5/363/2001)

Partners: Terra Humana (HU), ECN (NL), Rostock University (DE), Aristotle University of Thessaloniki (GR), CERTH/CSFTA (GR), CEREOL (HU), Latvian State Institute of Wood (LA), United European Environment Controls (UK)

SimTec participated in this project as a subcontractor of the Aristotle University of Thessaloniki. The contribution of SimTec was the formulation of a compact mathematical model for the simulation of low–temperature solid fuel carbonization in an industrial, heated rotary kiln reactor. A simple, yet comprehensive, chemical model was proposed, accounting for fuel drying, devolatilization, and char gasification. The model solves for the heterogeneous reactions between gaseous and solid species and is incorporated in the general Eulerian multiphase framework. Computations were performed in a three dimensional geometry of an industrial scale rotating kiln and in a two dimensional cross section with the Fluent CFD code, appropriately customized to incorporate the features of the proposed model. Results were reported in terms of gaseous and solids phase velocities, solid volume fractions, residence times, reaction rates and reactant and product concentrations as a function of the gasification temperature. The simulations were complemented by additional parametric studies.