引火点位置对连续重整反应器氢气爆炸的影响

Impact of ignition point on hydrogen explosion incontinual reform reactor

分析催化重整工艺的危险性,应用流体力学软件FLACS建立事故模型,分顶部引火和中部引火研究重整反应器不同位置氢气管道爆炸超压情况,分析爆炸超压发展过程、压力分布。研究表明,反应器顶部周边障碍物较少,不同泄漏量场景下的最大爆炸超压随着引火点与氢气-空气气团中心距离的增加先增加后减小;反应器中部周边障碍物较多,不同泄漏量场景下的最大爆炸超压受障碍物的约束以及引火点距氢气-空气气团距离的影响,呈现不一致的规律;反应器中部泄漏7~9 min后发生了由爆燃向爆轰的转变。

The fire danger of catalytic reforming process was analyzed. The computational fluid dynamics software （FLACS） was applied to build the accident model,then the explosion overpres sure in different position of hydrogen pipe were researched under conditions of top ignition and central ignition. The developing process of overpressure and the pressure distribution were analyzed. The results showed that, in the top of the reactor which has less obstacle, the maximum overpressure firstly increases and then decreases with the increasing distance between ignition position and the center of gas cloud; in the middle of the reactor which has more obstacle, the maximum overpressure was effected by obstacle and the distance between ignition position and the center of gas cloud and showed different trend; when the leakage time between 7-9 minutes in the middle of the reactor, deflagration-to-detonation transition was found.