Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/326930
Type: Artigo
Title: Simplified Model And Simulation Of Biomass Particle Suspension Combustion In One-dimensional Flow Applied To Bagasse Boilers
Author: Navarrete Cereijo
German; Curto-Risso
Pedro; Bizzo
Waldir Antonio
Abstract: A simple numerical model is presented to simulate the combustion of a biomass particle in a vertical stream. Emphasis focuses on the trajectories of spherical and cylindrical particles in the furnace. Combustion is modeled in three sequential stages: drying, pyrolysis and char combustion. Biomass consumption is determined by correlations based on Arrhenius kinetics and mass transfer parameters. Pyrolysis is modeled using five first-order kinetic equations considering the following products: volatiles, char and tar. The char consumption rate is modeled by three first-order kinetic equations, considering that char reacts with oxygen, carbon dioxide and water. The model is validated by comparing the duration of each simulated stage against experimental data taken from the literature. It is validated for spherical particles of up to 5 mm in diameter using a shrinking core model and for cylindrical particles of up to 3 mm using an ash-segregated model. Particle trajectory results are presented in order to determine the geometry and functional parameters of the combustion chamber that ensure complete suspension-firing. The combustion chamber geometry and biomass distributor height are determined as a function of airflow velocity and biomass characteristics for the combustion of bagasse with moisture contents of 30%-50% and particle diameters of 0.5 mm-3.5 mm. This study also allows the airflow velocity to be determined based on the boiler dimensions and the biomass characteristics to ensure that no particle ends up on the grate. After establishing the velocity, it is possible to determine what particle size will reach the top of the chamber or burn completely in suspension. (C) 2017 Elsevier Ltd. All rights reserved.
Subject: Biomass Combustion
Numerical Simulation
Biomass Boilers
Sugarcane Bagasse
Editor: Pergamon-Elsevier Science LTD
Oxford
Rights: fechado
Identifier DOI: 10.1016/j.biombioe.2017.01.030
Address: http://www.sciencedirect.com/science/article/pii/S0961953417300570
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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