Coal pyrolysis in a rotary kiln: Part I. Model of the pyrolysis of a single grain View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2000-04

AUTHORS

Fabrice Patisson, Etienne Lebas, François Hanrot, Denis Ablitzer, Jean-Leon Houzelot

ABSTRACT

A mathematical model is presented which describes the pyrolysis of a single grain of coal and is designed to be incorporated into an overall model simulating the rotary kiln coal pyrolysis process. The grain model takes into account the principal physical phenomena occurring during the conversion of coal to coke, namely, heat transfer toward and within the grain, drying of the coal, and the evolution of volatile species. Particular care has been taken in the determination of the thermophysical and kinetic parameters necessary for the model. Thus, the drying kinetics for Lorraine coal were measured by thermogravimetry. The kinetics of pyrolysis were determined by both thermogravimetry and gasphase chromatography, in order to separately monitor the evolution of the nine gaseous species considered. The true specific heat and the thermal conductivity of the solid were also measured as a function of temperature. The numerical model, based on the finite-volume method, calculates the temperature, composition, and mass flow rates for the different gases evolved at each point in the grain at any instant of time. The model was, finally, validated by comparing the calculated and measured values of the overall conversion of the pyrolysis reaction and the temperature at the center of the grain. More... »

PAGES

381-390

References to SciGraph publications

  • 2000-04. Coal pyrolysis in a rotary kiln: Part II. Overall model of the furnace in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11663-000-0056-5

    DOI

    http://dx.doi.org/10.1007/s11663-000-0056-5

    DIMENSIONS

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