气液逆流洗涤器内两相流场的实验研究与数值模拟

发布时间：2018-10-14 15:11

【摘要】：采用RNG k-ε湍流模型和欧拉双流体多相流模型模拟了气液逆流接触洗涤器内的两相流场,将计算结果用实验验证.通过考察两相流速、湍流强度、压降、气含率等参数验证了模型的可靠性,对不同喷嘴结构和操作条件下的泡沫区流场特性进行了模拟分析.结果表明,气液撞击形成的泡沫区湍流强度高,气液两相径向与切向速度较大,轴向速度较小,可用湍流强度大小表征泡沫区的大小.泡沫区占整个洗涤器的体积分数β随气液质量流量比增大先增大后减小,气液质量流量比为0.0096时达峰值;随进液轴/切流量比增大β先增大后减小,流量比为0.66时达峰值.喷口直径为8 mm、切向进液倾斜角为60°时气液传质效果最好.
[Abstract]:RNG k- 蔚 turbulence model and Euler two-fluid multiphase flow model are used to simulate the two-phase flow field in gas-liquid countercurrent contact scrubber. The calculated results are verified by experiments. The reliability of the model is verified by investigating the parameters of two-phase flow velocity, turbulence intensity, pressure drop and gas holdup. The flow field characteristics in the foam zone under different nozzle structures and operating conditions are simulated and analyzed. The results show that the turbulent intensity of the foam zone formed by gas-liquid impact is high, the radial and tangential velocity of gas-liquid two-phase is larger, and the axial velocity is smaller. The size of the foam zone can be characterized by the turbulence intensity. The volume fraction 尾 of foam region to the whole scrubber increases first and then decreases with the increase of the gas-liquid mass flow ratio, and reaches the peak value when the gas-liquid mass flow ratio is 0.0096, and then decreases with the increase of the axial / tangent flow ratio, and reaches the peak when the flow ratio is 0.66. The gas-liquid mass transfer is the best when the nozzle diameter is 8 mm, tangential inlet inclination angle is 60 掳.
【作者单位】：中石化洛阳工程有限公司;中国石油大学(北京)重质油国家重点实验室;
【基金】：国家自然科学基金资助项目(编号:21476254)
【分类号】：TQ051

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