气液两相并流向下通过筛板孔口单元的压降特性

doi:10.16085/j.issn.1000-6613.2019-0625

摘要/Abstract

摘要：

针对堆叠筛板填料的基本单元，采用12种不同规格的孔板，研究了气液两相并流向下通过孔口的压降特性，阐明了气液流量、孔板结构对压降的影响规律。结果表明：压降随气液流量的增加而增大；随孔径的增大而减小；在筛板常用厚度范围内，孔口锐缘效应使得压降随板厚减小而增大。根据孔口压降行为不同，以气相雷诺数Re_G=5000分界，建立了单一气相向下通过孔口的压降预测关联式；然后利用气相折算因子对关联式进行修正，得到了Re_G>5000时气液并流向下通过孔口的压降预测关联式；当Re_G<5000时，通过直接对单一气相阻力系数进行修正，得到了相应气相雷诺数范围内的气液两相压降预测关联式。

关键词: 堆叠筛板填料, 孔口单元, 气液两相流, 压降, 预测关联式

Abstract:

For the basic unit of stacked sieve plate packing, 12 orifice plates were used to study the pressure drop characteristics of gas-liquid two-phase co-current flowing down through the orifice, and the influence of flowrates and the orifice plate structure was clarified. The experimental results showed that the pressure drop increases with the increase of gas-liquid flow rate, decreases with the increase of orifice diameter. In the usual thickness range of the sieve plate, the pressure drop increases with the decrease of plate thickness due to the sharp edge effect of the orifice. According to the different behaviors of the pressure, the pressure drop prediction correlation of a single gas phase downward through the orifice was established with the Reynolds number of 5000 as the demarcation. When the gas Reynolds number is greater than 5000, the correlation is modified by using the gas phase conversion factor, and the pressure drop prediction correlation of gas-liquid two phases flowing down through the orifice was obtained. When the gas Reynolds number is less than 5000, the prediction correlation of gas-liquid two-phase pressure drop in the corresponding range of gas Reynolds number was obtained by directly modifying the single gas resistance coefficient.

Key words: stacked sieve plate packing, orifice unit, gas-liquid flow, pressure drop, correlation

中图分类号:

TQ 021.1

张安琪,谯敏,武劭恂,毛宇,黄卫星. 气液两相并流向下通过筛板孔口单元的压降特性[J]. 化工进展, 2020, 39(1): 49-55.

Anqi ZHANG,Min QIAO,Shaoxun WU,Yu MAO,Weixing HUANG. Pressure drop of gas-liquid two phase co-current flowing down through the orifice unit of sieve plate[J]. Chemical Industry and Engineering Progress, 2020, 39(1): 49-55.

图/表 10

图1 实验流程1—风机；2—排空管路；3—气体流量计；4—气相分布板；5—测试孔板；6—气液分离板；7—排空管路；8—水槽；9—清水泵；10—液体流量计；11—液相分布板；12—U形管

表1 孔板几何参数

编号	d/mm	t/d	A₁/A₂
A	6	0.13	0.0017
B	6	0.5	0.0017
C	6	0.95	0.0017
D	6	1.33	0.0017
E	10	0.12	0.0047
F	10	0.49	0.0047
G	10	0.93	0.0047
H	10	1.37	0.0047
I	14	0.11	0.0091
J	14	0.53	0.0091
K	14	0.94	0.0091
L	14	1.24	0.0091

图2 气液流量对压降的影响

图3 孔径对压降的影响

图4 相对板厚对压降的影响

图5 阻力系数随气相雷诺数的变化规律

图6 阻力系数计算值与实验值的误差

图7 修正系数与质量含气率的关系

图8 ReG≥5000时阻力系数计算值与实验值的误差

图9 ReG＜5000时阻力系数计算值与实验值的误差

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