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Explosion characteristics assessment of premixed biogas/air mixture in a 20-L spherical vessel

Sulaiman, Siti Zubaidah and Muhammad Harinder Khan, Nur Aqidah and Izhab, Izirwan and Md. Shaarani, Shalyda and Abdul Mudalip, Siti Kholijah and Che Man, Rohaida and Mohd Arshada, Zatul Iffah and Md. Kasmani, Rafiziana and Sulaiman, Sarina (2020) Explosion characteristics assessment of premixed biogas/air mixture in a 20-L spherical vessel. Chemical Engineering Communications. pp. 1-9. ISSN 0098-6445 E-ISSN 1563-5201

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Abstract

The understanding of biogas explosion characteristics is needed to describe the severity of the explosion. Biogas is a flammable gas and will explode when ignited. This study reports the experimental results on biogas explosion characteristics in a standard 20-L spherical vessel under quiescent conditions using electric spark (10 J) as an ignition source. Computational Fluid Dynamic (CFD) code FLame ACcelaration Simulator (FLACs) was used to simulate the biogas explosion based on the experimental case study. The dependence of explosion characteristics such as explosion pressure (Pmax), rate of pressure rise (dP/dt), and deflagration index (KG), on biogas concentration and carbon dioxide, CO2 composition is demonstrated. The data allow for the evaluation of the potential severity of biogas explosion, which in turn helps engineers design the explosion mitigation and prevention device related to this gas. The experimental data reported from this study concluded that Pmax ¼ 8–8.50 bar, the dP/dt¼100–400 bar/ms and the KG ¼ 32.7–121 bar m/ms were recorded at equivalence ratio, (ER) ¼ 1.2 with CO2 composition in the biogas ¼ 30% vol/vol. It was found that the severity of the biogas explosion increased proportionally with the biogas concentration. On the contrary, the explosive intensity was weakened by increasing the CO2 concentration due to the physical effects of CO2 and thermal instability. This study also recorded that the biogas explosion was categorized under hazard level¼St-3 indicating a catastrophic explosion. These data are important for preventing and mitigating the biogas explosion.

Item Type: Article (Journal)
Additional Information: 6797/86333
Uncontrolled Keywords: Biogas; deflagration index; explosion pressure; maximum explosion overpressure; maximum rate of pressure rise
Subjects: T Technology > TP Chemical technology
T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering
Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User: Dr Sarina Sulaiman
Date Deposited: 21 Dec 2020 17:50
Last Modified: 10 Jun 2021 14:31
URI: http://irep.iium.edu.my/id/eprint/86333

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