非均匀分布可燃气云爆炸威力分析

ANALYSIS ON EXPLOSION POWER OF NON-HOMOSPHERE FLAMMABLE GAS CLOUD

以高斯分布气云为例,研究了非均匀分布可燃气云爆炸的威力与机理,并与相同泄漏量的均匀分布可燃气云爆炸进行了对比分析。结果表明,当高斯分布可燃气云爆炸时,由于其可燃气体浓度偏离最危险浓度,燃烧速率降低,火焰维持不了自加速运动,对火焰阵面前的气体扰动较小,不会产生较强的冲击波。泄漏量为2228.2 m3的乙炔形成的2种高斯分布气云爆炸时,最高超压分别为4.31、.8 kPa,最多具有使玻璃窗破碎的破坏能力。当同样泄漏量的乙炔形成半径20 m、乙炔体积分数为13.3%的均匀分布气云爆炸时,可产生42.3 kPa的最大超压,具有使砖墙倒塌的破坏能力。因此,在工业现场发生可燃气体泄漏时,首要任务是避免泄漏气体形成混合良好的均匀可燃气云。

Taking Gaussian distribution cloud as an example, the explosion power and mechanics of non homosphere flammable cloud was investigated and compared with homosphere flammable cloud involving same leakage amount of flammable gas. The results showed that, due to the deviation of flammable gas concentration from the most dangerous concentration, the burning rate decreased and the flame could not maintain self-acceleration motion when the non-homosphere flammable cloud exploded. The powerful shock wave was not built in such cloud explosion because the influence to the gas in front of flame surface was weak. The explosion caused by two Gaussian distribution clouds involving 2228.2 ma ethyne could produce the maximum overpressures of 4.3 and 1.8 kPa, respectively, only resulting in glass window broken, while the explosion of the homosphere cloud involving same leakage amount of ethyne, with a radius of 20 m and the ethyne concentration of 13.3%, could produce a maximum overpressure of 42. 3 kPa to destroy a brick wall. Hence, the most important thing is to avoid the flammable gas forming a well mixed flammable cloud when it is leakage at industry scenes.