点火位置和开口率对泄压管道内爆炸压力的影响

Influence of ignition position and opening ratio on explosion pressure in pressure-relief pipe

为探究2种初始条件对天然气爆炸压力的影响特性,搭建球形容器泄压管道试验系统,通过在球形容器和泄压管道内布置压力传感器,研究不同点火位置(距球心0、2. 7、4. 7 m)和开口率(0%、25%、60%、100%)对天然气爆炸压力特性的影响。结果表明:当点火位置位于2. 7和4. 7 m时,球形容器内的峰值压力和升压速率显著大于0 m处点火的数值;设置泄压口明显降低了球形容器内的峰值压力,而随泄压口开口率增大,球内峰值压力降低幅度较小;容器密闭时,管道末端峰值压力在0 m处点火时最大,容器设有泄压口时,管道末端峰值压力在4. 7 m处点火时最大;在0 m处点火后管道末端的最大升压速率小于在2. 7和4. 7 m处点火后的速率。

In order to study the influence of different initial conditions on the explosion pressure of natural gas,an experimental system of a spherical vessel connecting to pressure relief pipe was built. By the pressure sensors placed in spherical vessels and pressure relief pipes,the characteristics of explosion pressure were obtained at the ignition position of 0,2. 7 and 4. 7 m from spherical vessel center and the opening ratio of 0%,25%,60% and 100%. The results show that when the ignition position is located at 2. 7 and 4. 7 m,the peak pressure and pressure increase rate in spherical vessel are significantly larger than the values after ignition at 0 m,that setting the pressure relief port obviously reduces the peak pressure in spherical vessels,but with the increasing of the opening ratio,the decreasing of peak pressure is not obvious,that the peak pressure at the end of the pipe is maximum at the ignition position of 0 m without the relief port while it is maximum at the ignition position of 4. 7 m with a pressure relief port,and that when the ignition position is at 0 m,the maximum pressure increase rate at the end of the pipe is less than that at the ignition position of 2. 7 and 4. 7 m.