INVESTIGADORES
MAZZA German Delfor
congresos y reuniones científicas
Título:
CFD Modeling of char particle combustion in a Fluidized Bed
Autor/es:
JOSÉ SORIA; MARIANA T. ZAMBON; ROSA RODRÍGUEZ; STELLA UDAQUIOLA; DANIEL GAUTHIER; GILLES FLAMANT; GERMÁN D. MAZZA
Lugar:
Lille
Reunión:
Congreso; XIIIème Congrès de la Société Française de Génie des Procédés; 2011
Institución organizadora:
SFGP
Resumen:
Combustion technologies are strongly developing over the world for two main reasons: theyreduce the weight and volume of waste, while producing thermal energy. They can be used foreliminating all types of waste: Municipal Solid Waste (MSW) after sorting, as well asHazardous Waste (HW), Medical Waste (MW), or Sewage Sludge. Although they are a goodway of processing waste, their environmental impact is of great concern. Therefore,understanding the mechanisms and processes involved in the combustion of particles is of keyimportance in the development of more efficient combustion systems.The char combustion process is selected since this is usually the limiting stage in the overallprocess of combustion of coal particle in the Fluidized Bed and the char temperature during thisstage is significantly higher than the temperature in the surroundings.In this work, Computational Fluid Dynamics tool is used for modeling the processes that takeplace in a single particle during Fluidized Bed combustion. The unsteady model comprisesphenomena of heat and mass transfer through a porous char particle, thermal non-equilibriumbetween the phases, as well as heterogeneous reaction inside the char particle along with theshrinkage of the particle.In this paper the volatiles evolution and combustion and heavy metal vaporization are notconsidered. Although these are important aspects for most practical wastes, the purpose here isto develop and validate a char model as a foundation on which to base later models of volatilesand pollutant processes.The results calculated via CFD are verified with experimental data, obtained in a laboratoryscale bubbling fluidized bed incinerator, and also compared with a previous model developedby the group [1]. This model combines an asymptotic-combustion model for carbonaceous-solidcombustion and a shrinking-core model to describe the heavy metal vaporization phenomenon,in which the particle is considered non-isothermal.