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Communication Dans Un Congrès Année : 2012

Modeling of coal drying

Damintode Kolani
  • Fonction : Auteur
  • PersonId : 933567
Eric Blond
Alain Gasser

Résumé

This work deals with the modeling of coal pyrolysis to coke for blast furnace which corresponds to the thermal decomposition process of organic substances in the absence of air. The final aim of the European project (SPRITCO) which includes this work is the prediction of the coal pushing on the heating wall in the coke oven battery to prevent their damage and then to increase their lifetime. The goal of this work is to develop a thermo-chemo-mechanical model of the coal paste which emphasis the mechanical effects of the pyrolysis. The first stage of the model corresponds to the drying of coal, modeled by a hygroscopic porous media. The mathematical formulation of the problem is a set of partial differential equations that combine mass balance, energy balance and state laws of each phase . The second stage concerns the change from coal to plastic phase which induces a mechanical behavior evolution of the skeleton, from elasticity to viscoplasticity. This transformation results in strong permeability decrease. The combination of the thermal gradient in the coal paste (at industrial size), the permeability evolution and the viscosity of the plastic phase have a major contribution to the final pushing pressure.This work deals with the modeling of coal pyrolysis to coke for blast furnace which corresponds to the thermal decomposition process of organic substances in the absence of air. The final aim of the European project (SPRITCO) which includes this work is the prediction of the coal pushing on the heating wall in the coke oven battery to prevent their damage and then to increase their lifetime. The goal of this work is to develop a thermo-chemo-mechanical model of the coal paste which emphasis the mechanical effects of the pyrolysis. The first stage of the model corresponds to the drying of coal, modeled by a hygroscopic porous media. The mathematical formulation of the problem is a set of partial differential equations that combine mass balance, energy balance and state laws of each phase . The second stage concerns the change from coal to plastic phase which induces a mechanical behavior evolution of the skeleton, from elasticity to viscoplasticity. This transformation results in strong permeability decrease. The combination of the thermal gradient in the coal paste (at industrial size), the permeability evolution and the viscosity of the plastic phase have a major contribution to the final pushing pressure.
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Dates et versions

hal-00787037 , version 1 (11-02-2013)

Identifiants

  • HAL Id : hal-00787037 , version 1

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Damintode Kolani, Eric Blond, Alain Gasser. Modeling of coal drying. 8th International Conference on Diffusion in Solids and Liquids, Jun 2012, Istanbul, Turkey. ⟨hal-00787037⟩
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