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Lumped Kinetics for Homogeneous Reactions of n-Hexadecane and n-Decene as Model Compounds for PE Pyrolysis Primary Tars

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  • Osvalda Senneca

    (’Istituto di Scienze e Tecnologie per l’Energia e la Mobilità Sostenibili (STEMS), Consiglio Nazionale delle Ricerche, P.le V.Tecchio 80, 80125 Naples, Italy)

  • Teresa Tucciullo

    (Dipartimento di Ingegneria Chimica dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V.Tecchio 80, 80125 Naples, Italy)

Abstract

The focus of this paper is to establish a lumped kinetic scheme for secondary reactions of tar produced from pyrolysis of plastics or polymer-based wastes. Notably, the focus is not on the detailed yield of all reaction intermediates and products but on the propensity to form soot. Based on the assumption that that primary tar from pyrolysis of plastic wastes is mostly formed by aliphatics which can undergo progressive aromatization to polycyclic aromatic hydrocarbons (PAHs) and soot, a reaction network with 198 species and 6307 reactions proposed by Ranzi and coworkers was lumped into a very simple five reaction mechanism. The lumped kinetic model has been used to predict PAHs and soot formation in different conditions and proved to be a good alternative to comprehensive kinetic models up for relatively low temperature and short residence times (of up to 1 min at 1200 K, up to 1 s at 1400 K). At higher temperature/longer residence times, the simplified model still provides reasonable qualitative trends but the amount of PAHs and soot is underestimated. The timescale of aromatization under inert conditions appears similar for all the alkanes and alkenes examined and also the yields in main reaction products seem to scale well with the number of carbon and hydrogen atoms of the parent alkane/alkene. Evolution of the young aliphatic tar into large aromatics is prevented as long as gaseous oxygen being available for oxidation. The lumped kinetic model has been used to highlight the effect of different modes of oxygen feeding and of incomplete mixing of fuel and oxygen on the formation of PAH and soot.

Suggested Citation

  • Osvalda Senneca & Teresa Tucciullo, 2020. "Lumped Kinetics for Homogeneous Reactions of n-Hexadecane and n-Decene as Model Compounds for PE Pyrolysis Primary Tars," Energies, MDPI, vol. 13(20), pages 1-18, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5466-:d:431388
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    References listed on IDEAS

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    1. Fivga, Antzela & Dimitriou, Ioanna, 2018. "Pyrolysis of plastic waste for production of heavy fuel substitute: A techno-economic assessment," Energy, Elsevier, vol. 149(C), pages 865-874.
    2. Umeki, Kentaro & Yamamoto, Kouichi & Namioka, Tomoaki & Yoshikawa, Kunio, 2010. "High temperature steam-only gasification of woody biomass," Applied Energy, Elsevier, vol. 87(3), pages 791-798, March.
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    Cited by:

    1. Muhammad Irfan & Rao Adeel Un Nabi & Hammad Hussain & Muhammad Yasin Naz & Shazia Shukrullah & Hassan Abbas Khawaja & Saifur Rahman & Abdulnoor A. J. Ghanim & Izabela Kruszelnicka & Dobrochna Ginter-K, 2022. "Response Surface Methodology Analysis of Pyrolysis Reaction Rate Constants for Predicting Efficient Conversion of Bulk Plastic Waste into Oil and Gaseous Fuels," Energies, MDPI, vol. 15(24), pages 1-17, December.

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