基于立式工业锅炉爆炸水汽泄漏过程的数值模拟

Numerical Simulation of Steam Leakage Process for Boiling Liquid Expanding & Vapour Explosion of Vertical Industrial Boiler

针对中小型立式工业锅炉,利用Fluent软件对锅炉缺水爆炸和超压爆炸水汽泄漏过程进行非稳态数值模拟,分别设定泄漏孔径为10 mm和20 mm,得到不同泄漏孔径下从泄漏开始到不同时刻的蒸汽速度分布情况,结果显示:蒸汽由孔口喷出,形成约400 m/s高速射流,距离孔口越远,速度越低;在10 mm孔口和20 mm孔口情况下,1 s时,距离孔口30 cm处,速度分别为117 m/s和237 m/s,是初始速度的30%和60%;孔口越大,射流刚性越强,速度衰减越慢,蒸汽速度场充满整个空间耗时越短。此研究真实形象地还原了锅炉爆炸水汽泄漏过程,为工业锅炉仿真技术研究提供了借鉴。

Oriented to small and medium sized vertical industrial boiler, its process of steam leakage of boiler because of water shortage and overpressure was numerical simulated by Fluent. By setting hole diameter of steam leakage of 10 mm and 20 ram, get the distribution of velocity from the ejection start to different time. Results showed that when steam flow eject from the hole can reach a high velocity of 400 m/s, the farther from the hole, the speed slower. At the moment of ls, the distance was 30 cm from the hole, the speed was 117 m/s and 237 m/s when the hole diameter changed from 10 mm to 20 mm; the hole larger, the rigidity of steam stronger, the speed decay slower, the time for steam full of the entire space shorter.