梭式窑自吸式烧嘴内部流动和传质特性的研究

发布时间：2018-06-19 04:32

本文选题：自吸式烧嘴 + 流动和传质特性　；参考：《陶瓷学报》2017年01期

【摘要】：利用ANSYS14.0软件,对某梭式窑的自吸式烧嘴在冷态、风门开度为10 mm、烧嘴出口相对压强为0 Pa、燃气相对压强分别为20000(工况1)和40000 Pa(工况2)两种典型工况下内部的流动和传质过程进行了数值模拟。模拟得到的烧嘴出口流速等与实测值吻合良好。根据模拟结果,对烧嘴内部的流动和传质特性进行了研究,得出结论:工况1、2烧嘴燃气入口的平均流速分别为5.49、6.71 m/s,燃气喷嘴中心处的速度分别为134、180 m/s,烧嘴出口的平均流速分别为2.49、4.07 m/s;因为管径突变,在烧嘴出口附近的贴壁处出现较大旋涡区,从而增加了流体机械能的损失;烧嘴轴线上存在压强较低的负压点,这是自吸式烧嘴能吸入空气的动力所在;工况1和2中,分别在混合管的1/2和3/4长度处,液化石油气与空气已基本混合均匀;工况1和2的实际一次空气消耗系数分别为0.92和1.06。
[Abstract]:Using ANSYS14.0 software, the self-priming burner of a shuttle kiln is in cold state. The flow and mass transfer processes were numerically simulated under two typical conditions, namely, the opening of the wind valve was 10 mm, the relative pressure of the burner was 0 Pa, and the relative pressure of the gas was 20 000 (working condition 1) and 40000 Pa (working condition 2), respectively. The simulated velocity of the burner outlet is in good agreement with the measured value. Based on the simulation results, the flow and mass transfer characteristics in the burner are studied. It is concluded that the average velocity of gas inlet is 5.49 ~ 6.71 m / s, the velocity at the center of the nozzle is 134180 m / s, and the average velocity at the outlet of the burner is 2.49 ~ 4.07 m / s, respectively. A large vortex region appears at the wall near the burner outlet, which increases the loss of fluid mechanical energy; there is a low pressure negative pressure point on the burner axis, which is where the self-priming burner can inhale the air; in working conditions 1 and 2, At the length of 1 / 2 and 3 / 4 of the mixing pipe, the mixing of LPG and air is basically uniform, and the actual primary air consumption coefficients of working conditions 1 and 2 are 0.92 and 1.06, respectively.
【作者单位】：景德镇陶瓷大学;
【基金】：国家自然科学基金(61563022)
【分类号】：TQ174.653

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