| As the development of chemical industry, the traditional trays cannot meet the actual production. So in order to achievement the goal of high efficiency, high-throughput and high operating flexibility, this paper devises a new type of tray components called swirl-contacting components according to the original column’s isolation downcomer structural advantages in laboratory. Gas forms a highly swirl flow field after the gas goes into the component tangentially, because of the role of guide vanes and the acceleration effect of tapered flow path. Liquid into the swirl center directly along the inlet tube, then was broken into droplets since the swirl gas flow field. So that, the droplets can contact and transfer with gas, before they are separated to the wall. Finally liquid is discharged from the slit, completing separation process of gas-liquid on the column.This paper establishes multiple swirl-contacting component models with different parameters about component using three-dimensional modeling software after discussing the relationship between the minimum flow area with the vane’s parameters, then these models are make numerical calculation using business software Fluent. The calculations show that the structure of 6 vanes is advantaged, because it has a greater tangential velocity, the pressure drop is moderate and the flow field is evenly distributed. Under the condition of causing insignificant changes on the swirl flow field, the slits are designed at 10 mm of width,65 mm of length.New component has been made based on the simulation and optimization results, and is subjected to a gas-liquid two-phase experiment after build the experimental platform obtaining the relationship between the pressure drop and operating parameters. The experiments show that the pressure drop mainly depends on the gas flow rate which is in a linear relationship with the square of flow rate, but changing liquid flow rate only caused minor fluctuations in pressure drop. Then, further experiments have done to collect the performance curve of the swirl contacting component:the lowest limits of liquid flow rate is 50 L/h; the upper limits is restricted by the slit’s capacity of drainage liquid; only when the gas volume flow rate is exceed 600 m3/h the downcomer starts flooding; the gas flow rate of occurring entrainment is gradually decreases with the increasing of liquid flow rate. The swirl-contacting component can normal operate at the valve hole kinetic energy factor between 8.8 to 21.2, this is much higher than ordinary columns; and its gas flow fluctuation range is greater than 2, the maximum fluctuation range of liquid is up to 20 with a good separation effect, so this design achieves the goal of improving the capacity.In addition, this paper carries out numerical simulation about gas-liquid two-phase flow field in the component against specific working conditions using VOF model. The results show that the liquid forms a liquid film after pouring out the inlet tube firstly. Then it is torn and blown into droplets of different sizes. Furthermore, the simulation found that the liquid leakage generated by the liquid cannot be transported to the discharge port, instead of the liquid fall along the inlet tube as it cannot be dispersed. Those conclusions can provide ideas for subsequent optimization.Synthesizing the results of numerical simulation and experiment, the swirl-contacting component has the characteristics of high-throughput and high flexibility. |
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