eprintid: 10192717
rev_number: 7
eprint_status: archive
userid: 699
dir: disk0/10/19/27/17
datestamp: 2024-05-24 08:14:14
lastmod: 2024-05-24 08:14:14
status_changed: 2024-05-24 08:14:14
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Hou, Fei
creators_name: Zhong, Xiaoxing
creators_name: Zanoni, Marco AB
creators_name: Rashwan, Tarek L
creators_name: Torero, José L
title: Multi-step scheme and thermal effects of coal smouldering under various oxygen-limited conditions
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F44
keywords: Coal fires; Smouldering; Multi-step scheme; Thermal effects; Oxygen-limited
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: Coal smouldering fires are global disasters and notoriously challenging to characterize. To better understand combustion and chemistry within these coal fires, TG-DSC experiments were carried out in two different coal samples in nitrogen and oxygen-limited (including ambient air) atmospheres. A mechanism with 8-step reactions simulating coal combustion was proposed, including one drying, two pyrolysis, two oxygen adsorption, and three high-temperature oxidations. The kinetic parameters were optimized via a Genetic Algorithm (GA). It was found that this 8-step mechanism created unnecessary overfitting to the TGA data. Therefore, two alternative schemes were developed with 5- and 4-step, which included and neglected oxygen adsorption, respectively. To compare the two schemes, GA and Gaussian multi-modal fitting were used to quantify the mass change rates in each step and their thermal effects as functions of oxygen concentrations. Moreover, the heat flow rates of coal samples were calculated and compared with measured DSC curves. The results indicated that oxygen adsorption could play a critical role in the transition from water evaporation to high-temperature combustion, and the 5-step scheme could reflect coal's intrinsic oxygen-limited combustion characteristics more accurately. Altogether, this study provides novel insight into coal smouldering under oxygen-limited conditions.
date: 2024-07-15
date_type: published
publisher: Elsevier BV
official_url: http://dx.doi.org/10.1016/j.energy.2024.131421
full_text_type: other
language: eng
verified: verified_manual
elements_id: 2271688
doi: 10.1016/j.energy.2024.131421
lyricists_name: Rashwan, Tarek
lyricists_name: Torero Cullen, Jose
lyricists_id: TLRRA25
lyricists_id: JLTOR59
actors_name: Torero Cullen, Jose
actors_id: JLTOR59
actors_role: owner
full_text_status: restricted
publication: Energy
volume: 299
article_number: 131421
issn: 0360-5442
citation:        Hou, Fei;    Zhong, Xiaoxing;    Zanoni, Marco AB;    Rashwan, Tarek L;    Torero, José L;      (2024)    Multi-step scheme and thermal effects of coal smouldering under various oxygen-limited conditions.                   Energy , 299     , Article 131421.  10.1016/j.energy.2024.131421 <https://doi.org/10.1016/j.energy.2024.131421>.      
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10192717/1/Fei-Manuscript-upload.pdf