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The Explosion Severity of Biogas(CH4-CO2)/Air Mixtures in a Closed Vessel

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 Rafiziana, Md Kasmani and Sarina, Sulaiman (2018) The Explosion Severity of Biogas(CH4-CO2)/Air Mixtures in a Closed Vessel. In: The 4th International Seminar of Science and Technology (ISST) 2018, 9 August 2018 , Surabaya, Indonesia. pp. 1-8.. (Unpublished)

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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: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: biogas, flammability limit, deflagration index, maximum explosion overpressure, maximum rate of pressure rise
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Noorul Farina Arifin
Date Deposited: 22 Apr 2019 08:45
Last Modified: 22 Apr 2019 08:45
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