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

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. © 2023 Chemical Industry Press. All rights reserved.