Abstract:

A semi-confined chamber was designed and an explosion suppression experiment on the effect of different spraying volume of methane-oxidizing bacteria and ultra-fine water mist on methane-air premixed mixture was studied. The methane-oxidative bacteria morphology, flame change visualization in the explosion suppression process, maximum explosion overpressure and the average pressure rise rate are analyzed. The results show that the ultra fine water mist containing methane-oxidizing bacteria-inorganic salt can effectively degrade methane, the larger the spray amount is, the faster the methane degradation speed is. With the methane volume being 9.5% and the flame propagation rate being 0.7 ml, when the methane had degraded after 360 min, the flame brightness and the flame propagation rate were lower than the situation caused by methane that had not degraded. When the spraying volume was added from 0.7 ml to 4.9 ml, the maximum explosion overpressure in the chamber decreased and the average pressure over the close part of the chamber decreased. The results indicate the synergistic effect of methane oxidizing bacteria-inorganic salt and ultrafine water mist on methane explosion. It can effectively degrade the methane in certain period of time.

Key words: methane, methane-oxidizing bacteria, ultrafine water mist, explosion suppression, safety

摘要：

搭建了半封闭的实验管道平台，开展了不同喷雾量的超细水雾降解与抑制甲烷爆炸的实验研究，分析了甲烷氧化菌的形态，抑爆过程中火焰变化，管道内部最大爆炸超压，平均升压速率的变化规律。结果表明：含甲烷氧化菌-无机盐的超细水雾能够有效降解甲烷，喷雾量越大，降解甲烷的速率越快，当甲烷的体积分数为9.5%，在喷雾量达到0.7 ml，立即引爆后的火焰亮度和火焰传播速率明显高于降解时间为360 min且二次喷雾量为0.7 ml的工况。喷雾量从0.7 ml增加至4.9 ml，无论近端还是远端最大爆炸超压均呈现下降的趋势，对于近端的平均升压速率也呈现下降的趋势。以无机盐为培养基的甲烷氧化菌和超细水雾降解与抑制甲烷爆炸具有协同作用，能够在一定时间内有效降解甲烷。

关键词: 甲烷, 甲烷氧化菌, 超细水雾, 爆炸抑制, 安全