Waste tire valorization by intermediate pyrolysis using a continuous twin-auger reactor: Operational features

Juan Daniel Martínez, Felipe Campuzano, Natalia Cardona-Uribe, Cindy Natalia Arenas, Daniel Muñoz-Lopera

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    12 Scopus citations

    Abstract

    Pyrolysis can be regarded as a roadmap towards a circular and sustainable economy for waste tires (WT). This work investigates the operational characteristics of a novel twin-auger reactor to transform WT by intermediate pyrolysis into tire pyrolysis oil (TPO), recovery carbon black (rCB), and tire pyrolysis gas (TPG). The influence of four operating parameters: reactor temperature (X1), WT mass flow rate (X2), solid residence time (X3) and N2 volumetric flow rate (X4), was assessed in order to maximize the TPO yield (Y1), while keeping the rCB one (Y2) as low as possible. The experimental campaign was conducted based on central composite design (CCD). The analysis of variance (ANOVA) showed that X1 and X2 exhibit the highest statistical influence. An optimization of both responses resulted in TPO, rCB, and TPG yields of 45, 40 and 15 wt%, respectively, when the pyrolyzer is operated at 475 °C, 1.16 kg/h, 3.5 min and 300 mL/min. At these conditions, the resulting TPO showed contents of C, H, S, N and O around 88.2, 9.7, 1.3, 0.7 and <0.1 wt%, respectively, along with a heating value of 42.02 MJ/kg. The rCB is comprised of moisture, volatile matter, fixed carbon, and ash around 2.5, 3.7, 75.5, and 18.3 wt%, respectively; while the TPG was mainly composed of H2 (23.7 vol%) and CH4 (28.2 vol%). Overall, these results suggest that twin-auger pyrolyzers are well suited for valorizing WT by intermediate pyrolysis.

    Original languageEnglish
    Pages (from-to)404-412
    Number of pages9
    JournalWaste Management
    Volume113
    DOIs
    StatePublished - 15 Jul 2020

    Bibliographical note

    Funding Information:
    The authors would like to express their sincere gratitude to COLCIENCIAS for the financial support given by the research project ( 1210-715-51742 ). F. Campuzano is in debt to COLCIENCIAS for the PhD scholarship ( 757-2016 ). D. Muñoz-Lopera expresses his gratitude to CIDI-UPB and its program “Formación Investigativa” for the MSc scholarship. The authors are also deeply grateful to GIMEL group from UdeA and Mr. Cristian Ortiz-Córdoba for their valuable support in the experimental campaign.

    Funding Information:
    The authors would like to express their sincere gratitude to COLCIENCIAS for the financial support given by the research project (1210-715-51742). F. Campuzano is in debt to COLCIENCIAS for the PhD scholarship (757-2016). D. Muñoz-Lopera expresses his gratitude to CIDI-UPB and its program “Formación Investigativa” for the MSc scholarship. The authors are also deeply grateful to GIMEL group from UdeA and Mr. Cristian Ortiz-Córdoba for their valuable support in the experimental campaign.

    Publisher Copyright:
    © 2020 Elsevier Ltd

    Keywords

    • Circular economy
    • Response surface methodology
    • Tire pyrolysis oil, recovery carbon black

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