含添加剂细水雾有无覆盖点火源条件下燃气爆炸特性OA

Gas leakage explosions in semi-enclosed spaces such as urban utility tunnels,catering establishments,and residential buildings pose severe threats to urban safety.To understand the influence of whether the atomization zone of explosion-suppressing fine water mist covers the ignition source on gas explosion characteristics,an independently designed explosion experimental system was used to simulate explosion suppression under two typical conditions(atomization zone covering the ignition source or not)with different additives.The influence laws of fine water mist containing potassium carbonate,sodium carbonate,potassium chloride,and procyanidins on the overpressure and flame morphology of methane-air explosions were clarified.The results showed that the explosion suppression effect when the fine water mist atomization zone covered the ignition source was more prominent than when it did not.Under the additive-containing fine water mist,the flame showed significant deformation and color changes,the explosion overpressure and dynamic pressure were significantly lower than those without fine water mist.The suppression capacities of fine water mist containing potassium carbonate,sodium carbonate,potassium chloride,and procyanidins were all greater than that of pure water fine water mist,among which potassium carbonate showed the strongest suppression capacity,followed by sodium carbonate,potassium chloride,and procyanidins.The maximum overpressure reduction rate under the ignition source coverage condition was 66%,and that under the non-coverage condition was 43.9%.The dynamic pressure was reduced by 55.9%,and the flame duration was extended by 134.8%.Covering the ignition source with the atomization zone can significantly reduce the destructiveness of gas explosions.The conclusions could provide support for the application of fine water mist explosion suppression technology.