Effects of a carbon monoxide-dominant gas mixture on the explosion and flame propagation behaviors of methane in air |
| |
| Institution: | 1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China;2. Beijing Key Laboratory of Powertrain for New Energy Vehicle, Beijing Jiaotong University, Beijing, 100044, China;1. School of Safety Science & Engineering, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi''an 710054, Shaanxi, PR China;2. Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;3. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd, Xi''an, 710054, Shaanxi, PR China;4. Postdoctoral Program, School of Engery, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi''an 710054, Shaanxi, PR China;5. Journal Center, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;1. Priority Research Centre for Frontier Energy Technologies & Utilisation, Discipline of Chemical Engineering, School of Engineering, Faculty of Engineering & Built Environment, University of Newcastle, Callaghan, NSW 2308, Australia;2. Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada;1. State Key Lab of Coal Resources and Safe Mining, Beijing, 10083, PR China;2. State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology), Beijing, 10083, PR China;3. School of Resource and Safety Engineering, China University of Mining & Technology, Beijing, 10083, PR China;1. School of Safety Science and Engineering, Xi''an University of Science and Technology, Xi''an 710054, PR China;2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi''an 710054, PR China;3. Shaanxi Engineering Research Center for Industrial Process Safety and Emergency Rescue, Xi''an 710054, PR China;1. Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania;2. University of Bucharest, Department of Physical Chemistry, Bd. Regina Elisabeta 4-12, 030018 Bucharest, Romania;3. INSEMEX (National Institute for Research and Development in the Mine Safety and Protection to Explosion), Str. Gral. Vasile Milea 33-34, Petrosani, Romania |
| |
| Abstract: | This work aimed to experimentally evaluate the effects of a carbon monoxide-dominant gas mixture on the explosion characteristics of methane in air and report the results of an experimental study on explosion pressure measurement in closed vessel deflagration for a carbon monoxide-dominant gas mixture over its entire flammable range. Experiments were performed in a 20-L spherical explosion tank with a quartz glass window 110 mm in diameter using an electric spark (1 J) as the ignition source. All experiments were conducted at room temperature and at ambient pressure, with a relative humidity ranging from 52 to 73%. The peak explosion pressure (Pmax), maximum pressure rise rate ((dp/dt)max), and gas deflagration index (KG) were observed and analyzed. The flame propagation behavior in the initial stage was recorded using a high-speed camera. The spherical outward flame front was determined on the basis of a canny method, from which the maximum flame propagation speed (Sn) was calculated. The results indicated that the existence of the mixture had a significant effect on the flame propagation of CH4-air and increased its explosion risk. As the volume fraction of the mixed gas increases, the Pmax, (dp/dt)max, KG and Sn of the fuel-lean CH4-air mixture (7% CH4-air mixture) increase nonlinearly. In contrast, addition of the mixed gas negatively affected the fuel-rich mixture (11% CH4-air mixture), exhibiting a decreasing trend. Under stoichiometric conditions (9.5% CH4-air mixture), the mixed gas slightly lowered Pmax, (dp/dt)max, KG, and Sn. The Pmax of CH4-air mixtures at volume fractions of 7%, 9.5%, and 11% were 5.4, 6.9, and 6.8 bar, respectively. The Sn of CH4-air mixtures at volume fractions of 7%, 9.5%, and 11% were 1.2 m/s, 2.0 m/s, and 1.8 m/s, respectively. The outcome of the study is comprehensive data that quantify the dependency of explosion severity parameters on the gas concentration. In the storage and transportation of flammable gases, the information is required to quantify the potential severity of an explosion, design vessels able to withstand an explosion and design explosion safety measures for installations handling this gas. |
| |
| Keywords: | Methane-air explosion Peak explosion pressure Deflagration index Spherical outward flame propagation Maximum flame propagation speed Gas storage |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
