典型盐粉及盐溶液对甲烷爆燃火焰传播特性的影响研究

Influence of typical salt powder and salt solution on flame propagation characteristics of methane deflagration

为了探究典型盐粉及盐溶液对瓦斯爆炸的抑制规律,在自行搭建的不锈钢火焰加速管道内开展了NaCl、KCl粉末及NaCl溶液抑制甲烷/空气预混气体爆炸试验,研究了不同粉末铺设面密度、铺设长度、铺液浓度、铺液长度对甲烷爆燃火焰传播的抑制效果及其抑爆机理。结果表明,铺设NaCl、KCl盐粉对甲烷爆燃火焰传播具有抑制作用,爆燃压力及火焰平均传播速度均低于空白对照组;当NaCl、KCl盐粉的铺设面密度为150mg/cm^(2)时,两种盐粉的火焰平均传播速度均衰减最大;随着粉末铺设长度的增加,对火焰传播抑制和促进作用均增强,KCl粉末的抑制作用相对于NaCl粉末更明显。布设NaCl溶液,爆燃火焰压力低于空白组。随着NaCl浓度的增加,爆燃压力的变化不明显,火焰平均传播速度呈降低趋势。溶液铺设长度增加,火焰平均传播速度、爆燃峰值压力逐渐降低。

To explore the suppression rules of gas explosion with typical salt powder and salt solution.We studied the influence of NaCl,KCl powder and NaCl solution on the deflagration flame propagation characteristics of methane/air premixed gas and built a stainless steel flame equipped.The results show that laying NaCl and KCl salt powder can inhibit the propagation of methane deflagration flame,and the deflagration pressure and average flame propagation speed are lower than those of the blank control group.When the laying surface density of NaCl and KCl salt powder is 150 mg/cm^(2),the average flame propagation velocity of the two salt powders attenuates the most.With the increase of the powder laying length,the inhibition and promotion of flame propagation are enhanced,but the degree of inhibition of KCl is more evident than that of NaCl.When laying out the NaCl solution,the deflagration flame pressure is smaller than that of the blank group.As the concentration of NaCl solution increases,the deflagration pressure changes non-significantly,and the average flame propagation velocity declines;as laying length of the solution increases,the average flame propagation velocity and peak pressure of deflagration decreases gradually.