Modelization of mass and energy flows from wood carbonization in retort kilns | Modelisation des flux massiques et energetiques dans la carbonisation du bois en four cornue
1999
Schenkel, Y.
The optimization of charcoal production in a retort kiln calls for control of the carbonization mass and energy flows. These ones depend essentially on three types of factors; the physico-chemical characteristics of the raw material, the operational parameters and the reactor parameters, A critical analysis of these factors has been conducted and completed by an evaluation of the existing pyrolysis models. The main objective of the thesis has been inferred : to define a general law describing existing links between the major physical characteristics of wood and the carbonization mass and energy flows. The carbonization experiments show the considerable importance of wood moisture content regarding mass and energy flows. The other physical properties - density, dimension, shape - are of a secondary importance. The heating rate is also a determining factor of mass and energy flows. The results of the carbonization experiments lead to the development of a phenomenological modelization of mass and energy flows of the total volatile matter produced through wood carbonization in retort kilns. This modelization is based on the logistic symmetric function. The mass flow model is applied to the industrial pilot kiln developed at the Centre de Recherche agronomique, Gembloux (Belgium). This application confirms the major effect of wood moisture content upon the economics of carbonization.
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