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

Alexander A. R. Gamboa (), Leila R. dos Santos, Cristiane A. Martins, Ana M. A. Rocha, Carlos A. Alvarado-Silva and João A. de Carvalho
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Alexander A. R. Gamboa: Programa de Investigación Formativa e Integridad Científica, Universidad César Vallejo, Trujillo CEP 13001, Peru
Leila R. dos Santos: Combustion, Propulsion and Energy Laboratory, Technological Institute of Aeronautics, São José dos Campos CEP 12228-900, Brazil
Cristiane A. Martins: Combustion, Propulsion and Energy Laboratory, Technological Institute of Aeronautics, São José dos Campos CEP 12228-900, Brazil
Ana M. A. Rocha: School of Mines, Federal University of Ouro Preto, Ouro Preto CEP 35400-000, Brazil
Carlos A. Alvarado-Silva: Programa de Investigación Formativa e Integridad Científica, Universidad César Vallejo, Trujillo CEP 13001, Peru
João A. de Carvalho: Campus of Guaratinguetá, São Paulo State University, Guaratinguetá CEP 12516-410, Brazil

Energies, 2023, vol. 16, issue 24, 1-26

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.

Keywords: tyre pyrolysis; thermodynamic analysis; heat for pyrolysis; energy self-sufficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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