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发本文介绍了储气库放空系统工况,根据集注站放空量的大小,运用PHAsT软件对放空量大于4×10~4m~3/h的情况下的天然气的扩散过程进行定量模拟,研究了放空速率、大气稳定度和风速对天然气扩散范围、闪火、爆炸和喷射火的影响。研究表明:放空速率越大,可燃气体爆炸范围越大:大气稳定度越高,越不有利于可燃气体的扩散,天然气爆炸范围越大,危险区域就越大;风速越小,天然气扩散越慢,危险区域越大,同时风速对闪火和辐射强度也有一定的影响,因此在放空时应限制放空速率,同时应考虑环境因素对扩散的影响,以便实现在储气库安全放空时降低事故发生率的目标。
In this paper, the condition of venting system of gas storage is introduced. According to the venting amount of collector station, the natural gas diffusion process is quantitatively simulated by PHAsT software when the venting volume is more than 4 × 10 ~ 4m ~ 3 / h. Venting rate, atmospheric stability and wind speed on the extent of natural gas spreads, flash fires, explosions and jet fires. The results show that the bigger the venting rate is, the bigger the combustible gas explosion range is: the higher the atmospheric stability is, the less it is conducive to the diffusion of combustible gas. The larger the natural gas explosion range is, the bigger the danger zone is. The smaller the wind speed, the slower the natural gas diffusion , The greater the danger zone, and the wind speed has a certain impact on flash fire and radiation intensity. Therefore, the venting rate should be limited during venting. At the same time, the influence of environmental factors on diffusion should be taken into account in order to reduce the accident when venting safely Rate the goal.