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Thermodynamic Evaluation of the Energy Self-Sufficiency of the Tyre Pyrolysis Process

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  • Alexander A. R. Gamboa

    (Programa de Investigación Formativa e Integridad Científica, Universidad César Vallejo, Trujillo CEP 13001, Peru
    These authors contributed equally to this work.)

  • Leila R. dos Santos

    (Combustion, Propulsion and Energy Laboratory, Technological Institute of Aeronautics, São José dos Campos CEP 12228-900, Brazil
    These authors contributed equally to this work.)

  • Cristiane A. Martins

    (Combustion, Propulsion and Energy Laboratory, Technological Institute of Aeronautics, São José dos Campos CEP 12228-900, Brazil
    These authors contributed equally to this work.)

  • Ana M. A. Rocha

    (School of Mines, Federal University of Ouro Preto, Ouro Preto CEP 35400-000, Brazil
    These authors contributed equally to this work.)

  • Carlos A. Alvarado-Silva

    (Programa de Investigación Formativa e Integridad Científica, Universidad César Vallejo, Trujillo CEP 13001, Peru
    These authors contributed equally to this work.)

  • João A. de Carvalho

    (Campus of Guaratinguetá, São Paulo State University, Guaratinguetá CEP 12516-410, Brazil
    These authors contributed equally to this work.)

Abstract

The aim of this paper is to evaluate the energy self-sufficiency of the tyre pyrolysis process using the pyrolysis gas produced as a heat source. Experimental data on the properties of the tyre and the main pyrolysis products (char, pyrolysis gas, and condensable vapours) have been compiled for a pyrolysis temperature range from 698 to 848 K. The laws of thermodynamics were used to calculate the energy demand of the tyre pyrolysis process, which was divided into heat for the pyrolysis reaction and heat transferred to the carrier gas. The pyrolysis gas was composed of 15 components, and its composition was calculated using a nonstoichiometric equilibrium model. For the temperature range studied, the heat required for the pyrolysis reaction was between 1.41 and 2.16 kJ/g of tyre. In addition, hydrocarbons (71 to 73 wt.%) were the major components in the calculated pyrolysis gas composition. An average lower heating value of 37.3 MJ/kg was calculated for the pyrolysis gas. The heat required for the tyre pyrolysis reaction was provided for burning 30–50% of the pyrolysis gas produced, thus making it self-sustaining. Energy self-sufficiency may not be achieved if the heat losses due to poor reactor insulation are high. However, this problem can be overcome by heating the combustion air using the heat released by the pyrolysis products during cooling.

Suggested Citation

  • Alexander A. R. Gamboa & Leila R. dos Santos & Cristiane A. Martins & Ana M. A. Rocha & Carlos A. Alvarado-Silva & João A. de Carvalho, 2023. "Thermodynamic Evaluation of the Energy Self-Sufficiency of the Tyre Pyrolysis Process," Energies, MDPI, vol. 16(24), pages 1-26, December.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:24:p:7932-:d:1294925
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    References listed on IDEAS

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