Reliability and applicability of empirical equations in predicting the reduced explosion pressure of vented gas explosions |
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| Affiliation: | 3. HSE management, NIOC, 8th Centre Building, Yaghma St., Tehran, Iran;1. College of Environment and Resources, Fuzhou University, Fuzhou 350116, PR China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, PR China;3. Anhui Electric Power Research Institute, Hefei 230601, PR China;1. School of Civil Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;2. Anhui International Joint Research Center on Hydrogen Safety, Hefei, 230009, PR China;1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China;2. College of Environment and Resources, Fuzhou University, Fuzhou, 350116, China;3. Anhui Electric Power Research Institute, Hefei. 230601, China;4. Department of Fire Protection Engineering, China People''s Police University, Langfang, 065000, Hebei, China;1. School of Civil Engineering, Hefei University of Technology, Hefei, Anhui, 230009, PR China;2. Anhui International Joint Research Center on Hydrogen Safety, Hefei, 230009, PR China;3. College of Environment and Resources, Fuzhou University, Fuzhou, 350116, PR China;4. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230009, PR China;5. Engineering Research Center of Safety Critical Industrial Measurement and Control Technology, Ministry of Education, PR China;1. School of Civil Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;2. Anhui International Joint Research Center on Hydrogen Safety, Hefei 230009, PR China;3. Engineering Research Center of Safety Critical Industrial Measurement and Control Technology, Ministry of Education, PR China |
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| Abstract: | Explosions caused by the rapid release of energy from the expansion of burnt gases, along with an associated pressure rise, in an enclosure can be mitigated by venting. Many empirical equations have been derived based on vented gas deflagration phenomena. In the present paper, four empirical equations for gas venting were reviewed, i.e., NFPA 68, the European Standard (EN 14994), Molkov et al. and Bradley and Mitcheson in order to assess their reliability and applicability for predicting the reduced explosion pressure (Pred) of propane-air, methane-air and hydrogen-air mixtures at three different chamber-scale volumes. The results showed that the NFPA 68 correlation is the most appropriate method for predicting Pred, while Bradley and Mitcheson gave values closer to those of experimental data for propane-air mixtures in medium and larger chambers, respectively. However, none of the predicted correlations was able to provide a reasonable prediction of Pred in a hydrogen-air explosion. In addition, these predicted correlations showed greater discrepancies in Pred values in the presence of vent area, ignition position and obstacles. |
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| Keywords: | Vented gas explosion Chambers |
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