Modelling and simulation of time-dependent coal combustion processes in stacks

F. Chejne, J. P. Hernandez, W. F. Florez, A. F.J. Hill

    Research output: Contribution to journalArticlepeer-review

    9 Scopus citations

    Abstract

    A time-dependent mathematical model and a numerical algorithm have been developed to simulate the combustion of piled coal particles. The model can predict the evolution profiles of unburned solid fraction along the bed height, the gas composition, heat of reaction, gas temperature and the coal (solid phase) temperature. Also, it predicts the radial temperature profile inside the particles. The model includes a system of six differential equations derived from the mass and energy balances for all phases at any point along the bed height and within each particle. For the numerical solution, implicit collocation and relaxation techniques were used with finite differences for the time advance. Additionally, the model can be used to optimise the combustion process varying the excess of air, particle size distribution, coal type, geometry of the reactor, different types of ignition mechanisms and the velocity of the grate.

    Original languageEnglish
    Pages (from-to)987-997
    Number of pages11
    JournalFuel
    Volume79
    Issue number8
    DOIs
    StatePublished - Jun 2000

    Bibliographical note

    Funding Information:
    The authors wish to thank COLCIENCIAS (Instituto Colombiano para el desarrollo de la Ciencia y Tecnologia Francisco José Caldas), MINERCOL (Minerales de Colombia) and DIRECCION DE INVESTIGACIONES of the Universidad Pontificia Bolivariana for their logistic and economic support.

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