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Numerical and experimental study of the influence of CO2 dilution on burning characteristics of syngas/air flame

Numerical and experimental study of the influence of CO2 dilution on burning characteristics of syngas/air flame
Numerical and experimental study of the influence of CO2 dilution on burning characteristics of syngas/air flame

In this study, effect of carbon dioxide dilution on explosive behavior of syngas/air mixture was investigated numerically and experimentally. Explosion in a 3-D cylindrical geometry model with dimensions identical to the chamber used in the experiment was simulated using ANSYS Fluent. The simulated results showed that after ignition, the flame front propagated outward spherically until it touched the wall, like the propagating flame observed in the experiment. Both experimental and simulated results presented a same trend of decreasing the maximum explosion pressure and prolonging the explosion time with CO2 dilution. The results showed that for CO2 additions, the maximum explosion pressure decreased linearly and the explosion time increased linearly, while the maximum rate of pressure rise decreased nonlinearly, which can be correlated to an exponential equation. In addition, both results showed a good agreement for syngas/air flame with CO2 addition up to 20% in volume. However, larger discrepancies were observed for higher levels of CO2 dilutions. Of the three diluents tested, carbon dioxide displayed the strongest effect in reducing explosion hazard of syngas/air flame compared to helium and nitrogen. Chemical kinetic analysis results showed that maximum concentration of major radicals and net reaction rates of important reactions drastically decreased with CO2 addition, causing a reduction of laminar flame speed.

CO dilution, Explosion, Numerical simulation, Rate of pressure rise, Syngas
1743-9671
1379-1387
Tran, Manh Vu
0a5a5a74-9c01-47bd-8f71-19da7460246e
Scribano, Gianfranco
8ed7796f-0354-4ec0-a7fd-06fa13e298f0
Chong, Cheng Tung
65b12c86-8a3e-45e8-873c-7db0c8b2cbd9
Ng, Jo Han
4c9c51bd-1cfc-46c0-b519-23b77566fe50
Ho, Thinh X.
ae205fc3-5663-40d6-9def-4b2de90b2611
Tran, Manh Vu
0a5a5a74-9c01-47bd-8f71-19da7460246e
Scribano, Gianfranco
8ed7796f-0354-4ec0-a7fd-06fa13e298f0
Chong, Cheng Tung
65b12c86-8a3e-45e8-873c-7db0c8b2cbd9
Ng, Jo Han
4c9c51bd-1cfc-46c0-b519-23b77566fe50
Ho, Thinh X.
ae205fc3-5663-40d6-9def-4b2de90b2611

Tran, Manh Vu, Scribano, Gianfranco, Chong, Cheng Tung, Ng, Jo Han and Ho, Thinh X. (2019) Numerical and experimental study of the influence of CO2 dilution on burning characteristics of syngas/air flame. Journal of the Energy Institute, 92 (5), 1379-1387. (doi:10.1016/j.joei.2018.09.004).

Record type: Article

Abstract

In this study, effect of carbon dioxide dilution on explosive behavior of syngas/air mixture was investigated numerically and experimentally. Explosion in a 3-D cylindrical geometry model with dimensions identical to the chamber used in the experiment was simulated using ANSYS Fluent. The simulated results showed that after ignition, the flame front propagated outward spherically until it touched the wall, like the propagating flame observed in the experiment. Both experimental and simulated results presented a same trend of decreasing the maximum explosion pressure and prolonging the explosion time with CO2 dilution. The results showed that for CO2 additions, the maximum explosion pressure decreased linearly and the explosion time increased linearly, while the maximum rate of pressure rise decreased nonlinearly, which can be correlated to an exponential equation. In addition, both results showed a good agreement for syngas/air flame with CO2 addition up to 20% in volume. However, larger discrepancies were observed for higher levels of CO2 dilutions. Of the three diluents tested, carbon dioxide displayed the strongest effect in reducing explosion hazard of syngas/air flame compared to helium and nitrogen. Chemical kinetic analysis results showed that maximum concentration of major radicals and net reaction rates of important reactions drastically decreased with CO2 addition, causing a reduction of laminar flame speed.

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More information

Accepted/In Press date: 19 September 2018
e-pub ahead of print date: 4 October 2018
Published date: 1 October 2019
Keywords: CO dilution, Explosion, Numerical simulation, Rate of pressure rise, Syngas

Identifiers

Local EPrints ID: 433925
URI: http://eprints.soton.ac.uk/id/eprint/433925
ISSN: 1743-9671
PURE UUID: 926faf0a-637b-46f0-af8d-42d6b6910bbc

Catalogue record

Date deposited: 06 Sep 2019 16:30
Last modified: 07 Oct 2020 01:00

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