Effect of N2 and CO2 on explosion behavior of syngas/air mixtures in a closed duct |
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| Affiliation: | 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, PR China;3. China Coal Technology and Engineering Group Corp Chongqing Research Institute, Chongqing, 400039, PR China;1. State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology -Beijing, Beijing, 100083, China;2. College of Resource and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China;3. School of Safety Engineering, North China Institute of Science and Technology, Sanhe, 065201, China;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China;3. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China;3. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China |
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| Abstract: | The explosion behavior of syngas/air mixtures under the effect of N2 and CO2 addition is experimentally investigated in three cases of N2 and CO2 volume fractions (0, 20% and 40%). Tests are performed for syngas/air mixtures with varying equivalent ratios (from 0.8 to 2.5) and hydrogen fractions (from 25% to 75%). The effects of N2 and CO2 addition on flame structure evolution, flame speed and overpressure histories are analyzed. The results showed that the tulip shaped flames appear in all cases regardless of whether N2 and CO2 are added. After flame inversion, the appearance of tulip shaped flame distortion can be observed in syngas/air without N2 and CO2 addition and meanwhile the oscillations are seen in the flame front position and speed trajectories. The flame distortion becomes less pronounced with N2 and CO2 addition, and the oscillation amplitude of the flame front position and speed reduce accordingly. Both addition of N2 or CO2 decrease the flame speed and the maximum overpressure. Therefore, it increases the time required for flame arriving to the discharge vent. Whereas CO2 has evidently better inhibition performance for syngas/air explosion. |
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| Keywords: | Syngas/air Explosion behavior Flame speed Overpressure |
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