含菌-无机盐超细水雾抑制甲烷爆炸试验研究

Experimental study on suppression of methane explosion with ultra-fine water mist containing both optimized methane oxidizing bacteria and inorganic salt

为进一步提高超细水雾抑制甲烷爆炸的效率,搭建抑制甲烷爆炸试验平台,开展用含甲烷氧化菌-无机盐超细水雾降解与抑爆甲烷的试验研究,考虑降解时间、第1次通雾量、第2次通雾量等3个因素进行正交试验,分析不同试验条件下甲烷爆炸压力和火焰传播过程。结果表明:改性培养基中的甲烷氧化菌降解甲烷效果优于普通培养基;降解时间对甲烷最大爆炸超压ΔP_(max)有显著影响,第2次通雾量对甲烷最大爆炸超压ΔP_(max)有一定影响;降解时间对火焰平均传播速度有显著影响,第2次通雾量对火焰平均传播速度有一定影响;同时增加降解时间和第2次通雾量可以降低平均升压速率和火焰平均传播速度。

To further improve the suppression efficiency of ultra-fine water mist on methane explosion,methane-air explosion inhibition experiments were carried out by using a experiment platform.In the experiments,ultra-fine water mists containing methane-oxidizing bacteria-inorganic salts were used as the inhibitors.Three factors including the degradation time,the first spraying volume and secondary spraying volume were taken into consideration,and orthogonal experiments were carried out.The methane explosion pressure and flame propagation process under different experiment conditions were analyzed.The experimental results show that the effect of methane-oxidizing bacteria degradating methane in the modified medium is better than that in the normal medium;the degradation time has a significant influence on the maximum explosion overpressureΔPmax of methane-air mixture,the secondary spraying volume has a certain influence on the maximum explosion overpressureΔPmax of methane-air mixture.The degradation time has a significant influence on the average flame propagation speed,the secondary spraying volume has a certain influence on the average flame propagation speed.Simultaneous increasing both the degradation time and the secondary spraying volume can reduce both the average pressure increasing rate and the average flame propagation speed.