COBEM99

SR4 Combustão

Title:

MODELLING AND SIMULATION OF WOOD CARBONIZATION PROCESS IN A RECTANGULAR OVEN

Summary :

MINAS GERAIS IS THE MAJOR CHARCOAL PRODUCER IN BRAZIL, HAVING ITS STEEL MILL SECTOR AS THE PRINCIPAL CONSUMER. THE SUBSTITUTION OF THE SURFACE OVENS BY RECTANGULAR ONES BY MANNESMANN FLORESTAL, CALLED MAFLA, IN THE LAST DECADE, HAS BROUGHT SOME BENEFITS TO THE CARBONIZATION PROCESS EFFICIENCY AND PRODUCTIVITY. IN THE PRESENT WORK THE POSSIBILITIES OF ENERGY SAVING AND PRODUCTIVITY IMPROVEMENT ARE DESCRIBED. IT S ALSO PRESENTED A PROTOTYPE INSTALLATION SCHEME, CONSTRUCTED ON ONE OF THE MAFLA S CHARCOAL PLANTS, WITH A DATA ACQUISITION SYSTEM FOR THE WOOD CARBONIZATION MONITORING. A NUMERICAL MODEL OF WOOD CARBONIZATION PROCESS, BASED ON THE REPRESENTATION OF THE GLOBAL THERMO-CHEMICAL SYSTEM BY ADEQUATE SUB-SYSTEMS, AND ITS COMPUTATIONAL SIMULATION ARE PROPOSED. THESE SUB-SYSTEMS, IN A FUTURE PUBLICATION, WILL BE REPRESENTED BY PHYSIC-MATHEMATICAL MODELS OF THE FOLLOWING PROCESSES: TAR AND NON CONDENSED GAS COMBUSTION, GASEOUS STREAM MIXING, HEAD LOSS AND HEAT TRANSFER ON THE DISTRIBUTION PIPING AND ON THE WOOD BED LOADED IN THE OVEN, AND WOOD DRYING AND CARBONIZATION. THE SOLUTION OF THE RESULTING EQUATION SYSTEM, WITH TRANSIENT BOUNDARY CONDITIONS, WILL PROVIDE THE TIME EVOLUTION OF THE INTERESTING VARIABLES, SPECIALLY THE GAS AND WOOD TEMPERATURE AND THE OXYGEN FRACTION IN THE OVEN. COMPARISON OF THE EXPERIMENTAL AND SIMULATED RESULTS WILL SUPPLY CONDITIONS TO VALIDATE THE NUMERICAL MODEL. KEYWORDS: CHARCOAL, BIOMASS, CARBONIZATION, SIMULATION, RECTANGULAR OVEN.

Author :

França, Geraldo Augusto Campolina
França, Geraldo Augusto C.
Nogueira, Clovis Pupo
Souza Junior, Lelio 0

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