Effect of roll on pressure drop in concurrent gas-liquid columns with tridimensional rotational flow sieve tray

doi:10.11949/0438-1157.20221393

Abstract

Abstract:

With air-water as the experimental medium, the pressure drop of tridimensional rotational flow sieve tray (TRST) under gas-liquid co-flow mode was measured, under the range of different sprinkle density 78—182 m³·(m²·h)^-1, gas phase loading factor 1.19—2.77 m·s^-1·(kg·m^-3)^0.5, the rolling amplitudes Θ=5°—15°, and the rolling periods T=8—20 s. The effects of gas-liquid flux, the number, position and mode of tray installation on pressure drop were investigated and compared with the vertical and tilt conditions. It turns out that, the dry plate pressure drop is less than 35 Pa for forward installation and less than 80 Pa for backward installation. And the dry plate pressure drop is not affected by incline and rolling, but decreases slightly with the increase of incline and rolling amplitude when the gas volume is large. The wet plate pressure drop during rocking is between upright and inclined, and is greatly affected by the rocking angle, and is basically not affected by the cycle. Increasing the gas volume is beneficial to resist the influence of incline and rolling, while increasing the liquid volume will aggravate the influence of incline and rolling. On the whole, the wet pressure drop during the forward and backward installation of the tray is within 90 Pa and 170 Pa respectively, while the change rate of pressure drops during the backward installation is about twice of the forward installation. This is because the gas-liquid flow direction is changed under the backward installation and the energy loss is increased. The pressure drop and the pressure drop change rate of the second and third trays were similar. The prediction models of dry pressure drop and wet pressure drop of TRST under the rolling condition of gas-liquid co-current flow mode were established, and errors are within 10% and 15% respectively.

Key words: column, tridimensional rotational flow sieve tray, gas-liquid flow, rolling condition, pressure drop

摘要：

以空气-水为实验介质，在喷淋密度78~182 m³·(m²·h)^-1、气相动能因子1.19~2.77 m·s^-1·(kg·m^-3)^0.5、摇摆幅值Θ=5°~15°、周期T=8~20 s的条件下，测定了气液并流模式下立体旋流筛板（TRST）的压降，考察了气液通量、塔板数量、位置和方式对压降的影响，并与直立和倾斜工况对比。结果表明：增加倾斜及摇摆角度干板压降略微下降；摇摆时的湿板压降介于直立和倾斜之间，受摇摆角度影响较大，基本不受周期影响；增大气量有利于抵抗倾斜及摇摆的影响，而增大液量会使倾斜及摇摆的影响作用加剧。整体上，塔板顺、逆向安装时的湿板压降分别在100 Pa和170 Pa以内，而逆向安装的变化率约为顺向的2倍，这是由于逆向安装下改变了气液流动方向，增大了能量损失。建立了气液并流摇摆工况下TRST的湿压降预测模型，相对误差在15%以内。

关键词: 塔器, 立体旋流筛板, 气液两相流, 摇摆工况, 压降

CLC Number:

TQ 027.1

Jianzhao BAI, Zixuan GUO, Dewu WANG, Yan LIU, Ruojin WANG, Meng TANG, Shaofeng ZHANG. Effect of roll on pressure drop in concurrent gas-liquid columns with tridimensional rotational flow sieve tray[J]. CIESC Journal, 2023, 74(2): 707-720.

白剑钊, 郭子轩, 王德武, 刘燕, 王若瑾, 唐猛, 张少峰. 摇摆对气液并流模式立体旋流筛板压降的影响研究[J]. 化工学报, 2023, 74(2): 707-720.

Figures/Tables 15

Fig.1 Experimental equipment and flow chart

Fig.2 Schematic diagram of three-dimensional cyclone sieve plate structure

Table 1 Geometric parameters of TRST structure

参数	数值
塔板高度h/mm	25
外筒直径/mm	69
内筒直径/mm	13
扭转角β/（°）	90
筛板厚度/mm	1.5
筛孔个数	45
筛孔直径/mm	2.5

Fig.3 Rolling mode and the variation of both the instantaneous rolling angle and angular velocity during the rolling of the column

Fig.4 Dry plate pressure drop under different tray installation positions and modes of Fs

Fig.5 Influence of different inclined amplitude, rolling amplitude and period on pressure drop of dry plate

Fig.6 Wet plate pressure drop under different tray installation positions and modes

Fig.7 Wet plate pressure drop variation rate under different tray installation positions and modes under inclined conditions

Fig.8 Wet plate pressure drop variation rate under different tray installation positions and modes under rolling conditions

Fig.9 Influence of inclined and roll on wet plate pressure drop under different Fs and Lw

Fig.10 Wet plate pressure drop changed with inclined amplitude

Fig.11 Wet plate pressure drop changed with rolling amplitude

Fig.12 Wet plate pressure drop changes with rolling period

Fig.13 Comparison of experimental and calculated dry plate pressure drop values

Fig.14 Comparison of experimental and calculated wet plate pressure drop values

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