正弦波纹挡板式沉降器内流动特性

doi:10.16085/j.issn.1000-6613.2019-1228

摘要/Abstract

摘要：

采用VOF模型对正弦波纹式入口挡板的重力非均相沉降器内流场进行数值模拟研究。对比了正弦波纹挡板与平挡板的平均流场分布情况，分析了沉降器的轴向流速均一程度（λ₁）随时间演化特性，探究了λ₁和面积加权平均湍流强度（I_a）在沉降器内空间分布特性；引入流场均稳指标USC，研究了冲击间距（L_b/D）对USC的影响。结果表明：正弦波纹挡板作为入口构件可以有效降低返混。在0.84＜L_b/D＜2.17范围内，正弦波纹板沉降器内流场的均一程度整体高于平面挡板；随着L_b/D减小，平挡板沉降器内流场的λ₁基本不变，但正弦波纹挡板沉降器内流场的λ₁降低，且对I_a的影响不明显。对比平挡板，正弦波纹挡板可以有效降低轴向速度的梯度，使返混区面积减小，流场稳定性提高。随着L_b/D增加，USC值呈现多峰值趋势，L_b/D=2.17时正弦波纹板沉降器的USC取得极大值为14.68，较平挡板提高了93.67%。

关键词: 数值模拟, 沉降器, 正弦波纹挡板, 多相流, 粒子图像测速

Abstract:

The volume of fluid (VOF) model was used to simulate the flow field in the sinusoidal corrugated baffle settler. The average flow field for the corrugated baffle and flat baffle were compared. The time evolution characteristics of axial velocity uniformity (λ₁) were analyzed, and the spatial distribution characteristics of λ₁ and area weighted average turbulence intensity (I_a) in the baffle settler were explored. Flow field uniform & steady criteria (USC)wasintroduced. The impact of distanc (L_b/D) on USC was studied. The results showed that corrugated baffle can reduce back mixing effectively. Within 0.84＜L_b/D＜2.17, the λ₁ in the corrugated plate settler was higher than that of the plane baffle. With the decrease of L_b/D, the λ₁ of the flat baffle settler was unchanged, but the λ₁ of the corrugated baffle settler decreased without any obvious influence on I_a. Compared with the flat baffle, the corrugated baffle can effectively reduce the gradient of velocity, reduce the back mixing area and improve the stability of the flow field. When L_b/D=2.17, USC of corrugated plate settler reached 14.68, which was 93.67% higher than that of the flat baffle.

Key words: numerical simulation, separator, sinusoidal corrugated baffle, multiphase flow, particle image velocimetry (PIV)

中图分类号:

TQ051.8

张玉辉,龚斌,王学平,张静,吴剑华. 正弦波纹挡板式沉降器内流动特性[J]. 化工进展, 2020, 39(4): 1273-1281.

Yuhui ZHANG,Bin GONG,Xueping WANG,Jing ZHANG,Jianhua WU. Flow field characteristics in sinusoidal corrugated baffle settler[J]. Chemical Industry and Engineering Progress, 2020, 39(4): 1273-1281.

图/表 12

图1 设备尺寸立体示意图1—进液圆管；2—正弦波纹挡板；3—斜板组；4—溢流堰

表1 不同网格尺寸划分方案

网格方案	网格体积×10^-9/m³		网格总数	平均偏差/%
网格方案	最小值	最大值	网格总数	平均偏差/%
1^#	3.02	19.77	644278	17.02
2^#	2.48	14.99	819495	13.86
3^#	1.09	10.58	1083770	2.698
4^#	0.70	6.073	1887723	—

图2 无关性验证

图3 实验装置示意图1—沉降器；2—正弦波纹挡板；3—排净阀；4—离心泵；5—缓冲罐；6—球阀；7—金属管转子流量计

图4 模型有效性验证

图5 截面Z/D=5.0处平均速度场

图6 轴向速度均一程度随时间演化情况

图7 轴向速度均一度的空间演化情况分析

图8 基于面积加权湍流强度的空间分布情况

图9 截面X/D=10的轴向平均速度云图

图10 截面X/D=10轴向速度均方根云图

图11 冲击间距对USC值的影响

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