摘要
为了研究CO_(2)对掺氢甲烷燃爆火焰向封闭空间传播的影响,采用半封闭试验管道,在开口端点火的条件下,研究CO_(2)对不同掺氢比例掺氢甲烷预混气体燃爆火焰传播的抑制试验。试验结果显示:掺氢比例的增加使掺氢甲烷火焰传播速度加快,爆炸压力升高。随着掺氢甲烷中CO_(2)体积分数的增加,指形火焰传播距离变长,郁金香火焰结构逐渐失稳,火焰传播速度减小,爆炸压力峰值降低,火焰和爆炸压力出现大幅度振荡的时间延后,振荡幅度减小。当CO_(2)体积分数达到15%时,不再形成郁金香火焰,火焰和爆炸压力不再大幅度振荡。研究表明,添加CO_(2)可以有效抑制掺氢甲烷燃爆火焰向封闭空间的传播。
To study the inhibition effect of CO_(2) on the propagation of hydrogen-doped methane deflagration flame into closed space,the experimental study on the inhibition effect of CO_(2) on the flame propagation of hydrogen-doped methane premixed gas with three different hydrogen blending ratios of 0,10%,and 20% were completed by using a semi-closed experimental pipeline under the condition of ignition at the opening end.The experimental results show that with the increase of hydrogen fraction,the flame propagation velocity of hydrogen-doped methane increases,the explosion pressure increases,and the arrival time of maximum explosion pressure decreases significantly.Adding CO_(2) can effectively reduce the fire risk of hydrogenated methane.With the increase of the volume fraction of CO_(2) in hydrogen-doped methane,the propagation distance of the finger flame becomes longer,and the structure of the formed tulip flame gradually loses stability.Besides,the addition of CO_(2) reduces the flame propagation velocity of hydrogen-doped methane,the peak value of explosion pressure decreases,the arrival time of maximum explosion pressure is significantly prolonged,the time of large oscillation of flame and explosion pressure is delayed,and the oscillation amplitude decreases.When the volume fraction of CO_(2) reaches 15%,the tulip flame is no longer formed.The flame only propagates forward slowly and uniformly with the finger-shaped flame,and the flame propagation back to the opening end is no longer observed.The flame front and the explosion pressure no longer oscillate greatly.At this time,the explosion pressure only oscillates at a very small amplitude of 0.1 kPa.With increasing volume fraction of CO_(2),the effect of hydrogen fraction on the velocity of flame propagation of hydrogenated methane decreases.In addition,the flame propagation velocity-time curve is in good agreement with the explosion pressure-time curve.The results show that the addition of CO_(2) can effectively suppress the hydrogenated methane flame in a closed space.
作者
陈晓坤
马赛燕
程方明
罗振敏
杨帅
王琛琛
CHEN Xiaokun;MA Saiyan;CHENG Fangming;LUO Zhenmin;YANG Shuai;WANG Chenchen(School of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Xi'an Urban Public Safety and Fire Rescue Key Laboratory,Xi'an 710054,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2023年第12期4279-4286,共8页
Journal of Safety and Environment
关键词
安全工程
甲烷
氢
火焰传播特性
气体爆炸抑制
半封闭空间
safety engineering
methane
hydrogen
flame propagation characteristics
gas explosion suppression
semi-closed space
