含瓦斯腔体及内置ABC干粉对瓦斯爆炸影响研究

Effect of gas-containing cavity and its built-in ABC dry powder on gas explosion

为探索一种瓦斯泄漏至硐室结构后发生爆炸的抑制方法,自行搭建管径为200 mm、总长为17 500 mm并含500 mm×500 mm×200 mm(长×宽×高)腔体的大型圆管爆炸试验系统,测试该尺寸腔体内含瓦斯和其内置ABC干粉的抑爆效果;利用数值模拟方法,分析上述尺寸腔体内含瓦斯时的爆炸传播特征。结果表明:无瓦斯腔体结构对瓦斯爆炸有较好抑制效果,而含瓦斯腔体结构则相反,其腔体后较腔体前爆炸火焰及冲击波峰值超压分别增大1. 68倍和1. 45倍;含瓦斯腔体结构内置ABC干粉量分别为400和300 g时,腔体后较腔体前的爆炸火焰大小及冲击波峰值超压由增加变为减小,当内置ABC干粉量为600 g时,火焰及冲击波抑制率较无内置ABC干粉时抑制率分别提高108. 4%和77. 46%。

In order to explore a method for explosion suppression after gas leakage into chamber structure,a large-scale round tube explosion test system,200 mm wide and 17 500 mm long with a500 mm×500 mm×200 mm( length×width×height) cavity,was built. Then,explosion suppression effect of gas-containing cavity and its ABC dry powder was tested. And explosion propagation characteristics in the above-mentioned cavity was analyzed with numerical simulation. The results show that while gas-free cavity structure has a better suppression effect on gas explosion,gas-containing cavity structure is the opposite,and explosion flame and shock wave peak overpressure in the back of it increase by 1. 68 and1. 45 times respectively compared to its front. When mass of ABC dry powder in gas-containing cavity structure is 400 g and 300 g,explosion flame and shock wave peak overpressure in its back change from increase to decrease compared to its front. When dry power is 600 g,suppression rates of flame and shock wave are increase by 108. 4% and 77. 46% respectively compared to those without ABC dry powder.