eprintid: 10192269
rev_number: 9
eprint_status: archive
userid: 699
dir: disk0/10/19/22/69
datestamp: 2024-05-14 10:58:20
lastmod: 2024-05-14 10:58:20
status_changed: 2024-05-14 10:58:20
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Iannello, Stefano
creators_name: Sebastiani, Alex
creators_name: Errigo, Matteo
creators_name: Materazzi, Massimiliano
title: The behaviour of plastic particles during pyrolysis in bubbling fluidized bed reactors: Incipient agglomeration and axial segregation
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F43
keywords: Axial segregation, Agglomeration, Fluidized bed, Pyrolysis, Monte Carlo modelling, X-ray imaging
note: © 2024 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
abstract: Plastic-fluidized bed interaction has been investigated by non-invasive X-ray imaging techniques in the temperature range of 500–650 °C and under pyrolysis conditions. Experiments were conducted by feeding a single polypropylene particle using either overbed or underbed feeding methods. The fluidized bed was operated from minimum fluidization conditions to bubbling regime, up to 2Umf. Interestingly, experimental observations show that the understanding of the mixing/segregation behaviour of polypropylene in a hot fluidized bed does not appear to be as straightforward as in the case of more conventional feedstocks, such as biomass. Further analysis and an alternative point of view to investigate the complex behaviour observed for plastic feedstock have been provided. The interaction between the fluidized bed and a single polypropylene particle was modelled by means of an axial segregation model, and a physics-assisted stochastic approach. In the second case, it was possible to simulate the formation of the sand-plastic agglomerate (incipient agglomeration stage) and the evolution of its density over time. The models were then validated by means of axial segregation data obtained via X-ray imaging techniques and by measuring the physical properties of real sand-polypropylene agglomerates produced within the bed operating at high temperatures. Results obtained in this study show that the unpredictable sinking-floating behaviour of the plastic particles is not related to the change in density associated to the formation of the sand-polypropylene agglomerates over time.
date: 2024-05-15
date_type: published
publisher: Elsevier BV
official_url: http://dx.doi.org/10.1016/j.powtec.2024.119846
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2274947
doi: 10.1016/j.powtec.2024.119846
lyricists_name: Materazzi, Massimiliano
lyricists_id: MMATE98
actors_name: Materazzi, Massimiliano
actors_id: MMATE98
actors_role: owner
full_text_status: public
publication: Powder Technology
volume: 441
article_number: 119846
issn: 0032-5910
citation:        Iannello, Stefano;    Sebastiani, Alex;    Errigo, Matteo;    Materazzi, Massimiliano;      (2024)    The behaviour of plastic particles during pyrolysis in bubbling fluidized bed reactors: Incipient agglomeration and axial segregation.                   Powder Technology , 441     , Article 119846.  10.1016/j.powtec.2024.119846 <https://doi.org/10.1016/j.powtec.2024.119846>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10192269/1/Materazzi_1-s2.0-S0032591024004893-main.pdf