The Explosion Severity of Biogas(CH4-CO2)/Air Mixtures in a Closed Vessel
| Autor: | Siti Kholijah Abdul Mudalip, Shalyda Md Shaarani, Nur Aqidah Muhammad Harinder Khan, Siti Zubaidah Sulaiman, Rohaida Che Man, Rafiziana Md. Kasmani, Zatul Iffah Mohd Arshad, Sarina Sulaiman, Izirwan Izhab |
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| Rok vydání: | 2019 |
| Předmět: |
021110 strategic
defence & security studies Materials science 020209 energy Mechanical Engineering 0211 other engineering and technologies Analytical chemistry 02 engineering and technology Condensed Matter Physics Methane Overpressure law.invention Ignition system chemistry.chemical_compound CO2 content chemistry Biogas Mechanics of Materials law Carbon dioxide 0202 electrical engineering electronic engineering information engineering Deflagration General Materials Science Flammability limit |
| Zdroj: | Materials Science Forum. 964:33-39 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.964.33 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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