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A computational model to simulate self-heating ignition across scales, configurations, and coal origins
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1-s2.0-S001623611831603X-main.pdf | Published version | 2.5 MB | Adobe PDF | View/Open |
Title: | A computational model to simulate self-heating ignition across scales, configurations, and coal origins |
Authors: | Yuan, H Restuccia, F Richter, F Rein, G |
Item Type: | Journal Article |
Abstract: | Self-heating of fuel layers can trigger ignition when the temperature of the surroundings is sufficiently high. Self-heating ignition has been a hazard and safety concern in raw materials production, transportation, and storage facilities for centuries. Hot plate and oven-basket experiments are the two most used lab-scale experiments to assess the hazard of self-heating ignition. While extensive experiments have been done to study this phenomenon, modelling of the experiments is substantially lagging behind. A computational model that can accurately simulate self-heating ignition under the two experimental configurations has not been developed yet. In this study, we build such a model by coupling heat transfer, mass transfer, and chemistry using the open-source code Gpyro. Due to the accessibility of large amount of experimental data, coal is chosen as the material for model validation. A literature review of the kinetic parameters for coal samples from different origins reveals that there is a compensation effect between the activation energy and exponential factor. Combining the compensation effect with our model, we simulate 6 different experimental studies covering the two experimental configurations, a wide range of sample sizes (heights ranging from 5 mm to 126 mm), and various coal origins (6 countries). The model accurately predicts critical ignition temperature (Tig) for all 24 experiments with an error below 7 °C. This computational model unifies for the first time the two most used self-heating ignition experiments and provides theoretical insights to understand self-ignition for different fuels under different conditions. |
Issue Date: | 15-Jan-2019 |
Date of Acceptance: | 11-Sep-2018 |
URI: | http://hdl.handle.net/10044/1/64683 |
DOI: | https://dx.doi.org/10.1016/j.fuel.2018.09.065 |
ISSN: | 0016-2361 |
Publisher: | Elsevier |
Start Page: | 1100 |
End Page: | 1109 |
Journal / Book Title: | Fuel |
Volume: | 236 |
Copyright Statement: | © 2018 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/) |
Sponsor/Funder: | Commission of the European Communities EPSRC Engineering and Physical Sciences Research Council |
Funder's Grant Number: | 682587 EP/M506345/1 EP/L504786/1 |
Keywords: | Science & Technology Technology Energy & Fuels Engineering, Chemical Engineering Self-heating Ignition Coal Hot plate Oven-basket LOW-TEMPERATURE OXIDATION SMOLDERING COMBUSTION KINETIC-PARAMETERS THERMAL IGNITION DUST LAYERS HOT SURFACE PYROLYSIS BEHAVIOR BIOMASS LIGNITE 0904 Chemical Engineering 0913 Mechanical Engineering 0306 Physical Chemistry (Incl. Structural) Energy |
Publication Status: | Published |
Online Publication Date: | 2018-09-24 |
Appears in Collections: | Mechanical Engineering Faculty of Engineering |