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为提高双P型辐射管的循环倍率,运用FLUENT软件数值模拟研究了喷口喷射速度、喷口位置、出口压力和支管结构对双P型辐射管烟气循环的影响规律。结果表明,喷口喷射速度由75 m/s提高到150 m/s,辐射管烟气循环倍率提高约60%;喷口从外侧(x=-115 mm)移动到中心(x=0),循环倍率提高约8%。此外,将直角式的回流支管结构改为弯管式结构能促使循环倍率提高约2.5%~8%;而出口压力变化对循环倍率影响不大。
In order to improve the cycle rate of double P type radiant tube, the influence of jet velocity, position of nozzle, outlet pressure and branch structure on flue gas cycle of double P type radiant tube was studied by numerical simulation with FLUENT software. The results show that the jet velocity increases from 75 m / s to 150 m / s and the circulation rate of the flue gas increases by about 60%. The jet moves from the outside (x = -115 mm) to the center (x = 0) Increase about 8%. In addition, changing the structure of the right-angle return branch to the bent-tube structure can promote the circulation rate to increase about 2.5% -8%; and the change of the outlet pressure has little effect on the circulation rate.