Kang Cen, , , Yanling Yang*, , , Yulong Duan, , , Hongfu Mi, , , Gang Xi*, , and , Shuo Wang,
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引用次数: 0
Abstract
As the operating years of the underground integrated pipe increase and the aging of various pipelines progresses, as well as coal mining operations, the potential risks of fire and explosion gradually rise. To effectively alleviate the harm caused by explosion accidents, a synergistic suppression method is proposed. This paper aimed to study the synergistic effects of porous sliding devices and water mist on methane/air explosions with different equivalent ratios by changing the porosity of porous medium and spray pressure. The results indicate that the combined use of porous sliding devices and water mist yields better synergistic suppression effects in terms of the explosion overpressure and the flame propagation velocity. Based on the orthogonal test results, the optimal synergistic combination was obtained, that is, a porosity of 60 PPI and a spray pressure of 0.1 MPa. The flame propagation velocity with Φ = 1.0 decreases by 17.91%, and the peak overpressure rate of explosion decreases by 34.72%. In addition, the relationship between explosion energy, flame propagation velocity, and explosion overpressure is established according to the Buckingham Π theorem. The establishment of the model and the experimental results have important theoretical significance for evaluating the degree of explosion risk after the addition of synergistic devices. Finally, the suppression mechanism of the synergistic device in the methane/air explosion process was elucidated by combining the key free radicals and basic reactions involved in the methane explosion process through chemical kinetics simulations. This study can provide numerical data support and a theoretical reference for active suppression systems applied in realistic scenarios.