The explosion severity of biogas(CH4-CO2)/air mixtures in a closed vessel
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...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Scientific.Net
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/76625/ http://irep.iium.edu.my/76625/ http://irep.iium.edu.my/76625/ http://irep.iium.edu.my/76625/1/76625_The%20Explosion%20Severity%20of%20Biogas.pdf http://irep.iium.edu.my/76625/7/76625_The%20explosion%20severity%20of%20biogas%28Ch4-co2%29%20or%20air%20mixtures%20in%20a%20closed%20vessel_Scopus.pdf |
| Summary: | 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. |
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