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Author(s): Carlos Pinho
Tânia Ferreira
Edmundo Marques
Diana Almeida
Carlos Pereira
João Monney Paiva
Title: Steady State Fixed Bed Combustion of Wood Pellets, A Simple Theoretical Model
Issue Date: 2014
Abstract: The combustion of biomass comes from a sequence of several distinct phases which begin when its ignitionoccurs, followed by drying, pyrolysis, gasification and combustion of carbonaceous residue. For small solid fuelboilers, as is the case of pellet boilers for domestic heating, biomass particles are continuously burned in fixed bedboilers or heaters. In these appliances the furnace is a kind of metallic basket into which fuel particles are thrown andburn in a fixed bed. The combustion air is introduced through orifices drilled in this metallic basket although somelateral air entrances are also found. The gaseous flow is a piston flow, the particles fall under gravity on the upper bedsurface and as they burn they slowly move downwards until their size is small enough to fall down through the airentrance orifices or are dragged by the upcoming combustion gas flow. So the gaseous current has an up flowmovement while the solid particles move downwards. It is assumed that the bed is at uniform temperature and all theaverage properties of the gaseous flow are constant with the exception of the oxygen concentration that reduces as thegas flow rises through the bed. This paper presents a simple mathematical model that allows that the steady stateburning time of a solid particle, as well as the amount of energy released, can be calculated and, later on, compared toexperimental data.
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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