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Open AccessArticle

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

1
’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
2
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
*
Author to whom correspondence should be addressed.
Energies 2020, 13(20), 5466; https://doi.org/10.3390/en13205466
Received: 31 August 2020 / Revised: 8 October 2020 / Accepted: 13 October 2020 / Published: 19 October 2020
(This article belongs to the Special Issue Thermochemical Conversion of Biomass and Waste)
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. View Full-Text
Keywords: pyrolysis; combustion; lumped kinetics; tar; soot; plastics pyrolysis; combustion; lumped kinetics; tar; soot; plastics
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MDPI and ACS Style

Senneca, O.; Tucciullo, T. Lumped Kinetics for Homogeneous Reactions of n-Hexadecane and n-Decene as Model Compounds for PE Pyrolysis Primary Tars. Energies 2020, 13, 5466. https://doi.org/10.3390/en13205466

AMA Style

Senneca O, Tucciullo T. Lumped Kinetics for Homogeneous Reactions of n-Hexadecane and n-Decene as Model Compounds for PE Pyrolysis Primary Tars. Energies. 2020; 13(20):5466. https://doi.org/10.3390/en13205466

Chicago/Turabian Style

Senneca, Osvalda; Tucciullo, Teresa. 2020. "Lumped Kinetics for Homogeneous Reactions of n-Hexadecane and n-Decene as Model Compounds for PE Pyrolysis Primary Tars" Energies 13, no. 20: 5466. https://doi.org/10.3390/en13205466

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