The explosion severity of biogas(CH4-CO2)/air mixtures in a closed vessel

Muhammad Harinder Khan, Nur Aqidah and Sulaiman, Siti Zubaidah and Izhab, Izirwan and Abdul Mudalip, Siti Kholijah and Che Man, Rohaida and Md Shaarani, Shalyda and Mohd Arshad, Zatul Iffah and Md Kasmani, Rafiziana and Sulaiman, Sarina (2019) The explosion severity of biogas(CH4-CO2)/air mixtures in a closed vessel. Materials Science and Technology, 964. pp. 33-39. ISSN 1662-9752

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Abstract

Biogas which consists of methane (CH4) and carbon dioxide (CO2) could explode when diluted to a certain degree with air in the presence of ignition source. The maximum explosion overpressure (Pmax), the maximum rate of pressure rise (dP/dt)max, flammability limits, and deflagration index are the most important explosion severities parameters to characterize the risk of explosion. In this research paper, the effect of equivalence ratio (ER) of biogas/air mixtures and the effect of CO2 concentrations presence in biogas were studied in a 20 L spherical vessel. The values of Pmax and (dP/dt)max of biogas/air mixtures were more severe at ER 1.2. At various CO2 content, Pmax and (dP/dt)max of biogas/air mixtures were the least affected at 45% vol/vol of CO2. On the other hand, deflagration index (KG) of biogas/air mixtures trend was the most severe at 35% vol/vol of CO2 content despite the lowest Pmax and (dP/dt)max at 45% vol/vol of CO2 content. The lowest values in Pmax and (dP/dt)max were due to the diffusivity properties of CH4 that had surpassed the CO2 suppression effect. Furthermore, the presence of CO2 in biogas/air mixtures had increased the upper flammability limit and lower flammability limit of biogas.

Item Type:	Article (Journal)
Additional Information:	6797/76625
Uncontrolled Keywords:	biogas, flammability limit, deflagration index, maximum explosion overpressure, maximum rate of pressure rise
Subjects:	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:	10 Dec 2019 11:20
Last Modified:	20 Feb 2020 22:59
URI:	http://irep.iium.edu.my/id/eprint/76625

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