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设计了球形容器内气体爆炸通过导管泄爆的试验系统,选用体积分数为10%(特殊说明除外)的甲烷和空气预混气体开展试验,研究了泄爆导管长度、容器容积、点火位置、气体体积分数、破膜压力等因素的影响。结果表明:泄爆导管越长,容器内的正压力峰值和负压力峰值越大;密闭爆炸时,球形容器的容积对爆炸压力峰值几乎无影响;不同容积球形容器内气体爆炸通过相同导管泄爆时(导管长度均为6 m,直径均为0.06 m),容积大的容器内的压力锋值为小容器压力值的3.3倍,且大容器内的压力上升速率也明显高于密闭爆炸的情况;有泄爆导管存在时,尾部点火容器内的压力峰值高于中心点火;泄爆导管的存在使得容器内的压力峰值高于直接泄爆时的压力峰值;无论有、无泄爆导管,容器内的压力峰值均随破膜压力增加而增加,但差值越来越小,说明导管的存在对容器爆炸泄爆过程的影响趋向缓和,但导管的存在总是阻碍了泄爆过程,增加了爆炸的严重程度,因此,在泄爆设计时要充分考虑导管的影响,适当提高容器自身的耐压强度。
A test system of gas explosion in spherical vessel through vent pipe was designed. The experiment was conducted on methane and air premixed gas with a volume fraction of 10% (except for special instructions). The effects of vent pipe length, vessel volume, ignition position, gas Volume fraction, rupture pressure and other factors. The results show that the longer the vent pipe, the larger the peak value of positive pressure and the negative pressure in the vessel. The volume of the spherical vessel has almost no effect on the peak value of explosion pressure during closed explosion. The gas explosion in different volume of spherical vessel leaks through the same conduit (Both 6 m in length and 0.06 m in diameter), the pressure front in a large container is 3.3 times the pressure in a small container and the rate of pressure rise in a large container is also significantly higher than in a closed explosion ; When a vent pipe exists, the pressure peak in the tail ignition vessel is higher than the center ignition; the existence of the vent pipe causes the pressure peak value in the vessel to be higher than the pressure peak value at the time of direct venting; whether or not there is a vent tube, Pressure peak value increased with the increase of rupture pressure, but the difference was smaller and smaller, indicating that the existence of catheter tends to ease the explosion of container explosion process, but the existence of the catheter is always hindered the process of explosion, an increase of Explosion of the severity, therefore, in the design of venting to take full account of the impact of the catheter, appropriately increase the container’s own compressive strength.