Thermodynamic analysis for syngas production from volatiles released in waste tire pyrolysis

Juan Daniel Martínez, Ramón Murillo, Tomás García, Inmaculada Arauzo

    Research output: Contribution to journalArticle in an indexed scientific journalpeer-review

    40 Scopus citations

    Abstract

    This paper shows the maximum limit on syngas composition obtained from volatiles released in waste tire pyrolysis when they are submitted to an air-steam partial oxidation process. Thus, from mass and energy balances and a stoichiometric equilibrium model, syngas composition and reaction temperature as well as some process parameters were predicted by varying both the equivalence ratio (ER) and the steam to fuel ratio (SF). In addition, pyrolysis experiments were performed using a continuous auger reactor, and the influence of pyrolysis temperature on composition of both volatiles and char was studied. Consequently, the resulting syngas characteristics were correlated with the pyrolysis temperature. The stoichiometric equilibrium model showed that an ER down to 0.4 is a practical limit to perform the air-steam partial oxidation process. When the process is carried out only with air, volatiles obtained at high pyrolysis temperature lead to lower reaction temperature and higher LHV of syngas in comparison with those found at low pyrolysis temperature. The H2 production is favored between 0.20 and 0.40 of ER and seems to be more influenced by the H/C ratio than by the water gas-shift reaction. On the other hand, the steam addition shows a more notable effect on the H2 production for volatiles obtained at the highest pyrolysis temperature (600 C) in agreement with the lower reaction temperature under these experimental conditions. This thermodynamic analysis provides essential data on the optimization of syngas production from volatiles released in waste tire pyrolysis prior to run any test.

    Original languageEnglish
    Pages (from-to)338-353
    Number of pages16
    JournalEnergy Conversion and Management
    Volume81
    DOIs
    StatePublished - May 2014

    Bibliographical note

    Funding Information:
    This study has been carried out under the framework of the PET2008-0103 project financed by the Spanish Ministry of Science and Innovation. The authors would also like to thank MINECO and FEDER funds for providing partial support (project CTQ2012-37984-C02-01) as well as Aragon Regional Government (DGA). J.D. Martínez acknowledges to Departamento Administrativo de Ciencia, Tecnología e Innovación, COLCIENCIAS, for the fellowship.

    Keywords

    • Gasification
    • Pyrolysis
    • Syngas
    • Thermodynamic equilibrium
    • Waste tire

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