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Numerical simulation on the effect of concentration on premixed CH4/CO2/air explosion characteristics

Nur Aqidah, Muhammad Harinder Khan and Siti Zubaidah, Sulaiman and Izirwan, Izhab and Siti Kholijah, Abdul Mudalip and Rohaida, Che Man and Shalyda, Md Shaarani and Zatul Iffah, Mohd Arshad and Kasmani, R. M. and Sarina, Sulaiman (2019) Numerical simulation on the effect of concentration on premixed CH4/CO2/air explosion characteristics. Journal of Chemical Engineering and Industrial Biotechnology (JCEIB), 5 (5). pp. 39-47. ISSN 0126-8139

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Abstract

In this study, a numerical simulation on the premixed CH4/CO2/air (methane/carbon dioxide/air) mixture explosion characteristics was conduted by using the Flame ACcelaration Simulator (FLACs) software. The domain used in the 20 L spherical vessel with 0.808 m diameter. The effect of various equivalence ratios on the explosion characteristics such as the explosion pressure, Pex, maximum explosion overpressure, Pmax, the maximum rate of pressure rise, (dP/dt)max and gas deflagration index, KG, were studied. For this purpose, the mixture concentrations range from equivalence ratio (ER) 0.8 to 1.5 (9.6 to 18% vol/vol) were considered. From this study, the explosion pressure, Pex, maximum explosion overpressure, Pmax, the maximum rate of pressure rise, (dP/dt)max, at various ER was the maximum at a slightly rich concentration (ER=1.2). At lean and rich mixtures, the Pex, Pmax, (dP/dt)max and KG decreases. It can be said that, at ER=1.2, the role of thermal-diffusive instability and its effets on the flame speed during the pressure development process dah causes the diffused methane, CH4 present in the lean and rich mixtures. The CH4/CO2/air mixtures studied in this study were also found to have the highest level of hazard potential when exploded.

Item Type: Article
Additional Information: Indexed by MyCite
Uncontrolled Keywords: Explosion characteristics; FLACs; Numerical simulation; Carbon dioxide; CH4/CO2/air mixture
Subjects: Q Science > QD Chemistry
T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 25 Oct 2019 02:03
Last Modified: 25 Oct 2019 02:03
URI: http://umpir.ump.edu.my/id/eprint/25237
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