| As a means of process intensification,hypergravity technology has been successfully applied in the dehydration process of TEG.However,as the device for realizing the supergravity TEG dehydration technology,the rotating bed,there is still a lack of in-depth research on the structure optimization and the determination of process parameters.Therefore,based on the structure optimization of the supergravity TEG dehydration rotary packed bed,this paper aims to explore the relationship between the structure of the rotary bed and the energy consumption and dehydration efficiency,and to determine the more suitable structure type and operating parameters,so as to provide ideas for the design and industrialization of TEG dehydration rotating bed.Based on the supergravity TEG dehydration experimental device,the wet-bed pressure drop and dehydration performance of six kinds of packed rotating beds under different operating conditions were investigated experimentally.The results show that the changing laws of the six packed rotating beds are basically the same.The pressure drop of wet bed increases with the increase of rotation speed and gas volume,and remains basically unchanged with the increase of liquid volume.The influence degree from large to small is: gas volume > rotation speed > liquid volume;The dehydration equilibrium degree increases with the increase of rotation speed and liquid volume,and the increasing trend gradually slows down.With the increase of gas volume,it first increases and then decreases.The influence degree from large to small is: gas volume ≥ liquid volume > rotation speed.The order of the average comprehensive performance of the six kinds of fillers from good to bad is: west tower ring > wire mesh >polypropylene mesh plate 3 > 304# mesh plate 1 > 304# mesh plate 2 > spherical.The experiment and simulation study of two kinds of TEG distributors(central tube type,T-shaped tube type)on the rotating bed were carried out.Fluent software was used to analyze the internal flow field of the two distributor rotating beds,as well as the staged pressure drop and TEG distribution under different operating conditions.The uniformity index is correlated with the dehydration equilibrium degree,and the wet bed pressure drop and dehydration equilibrium degree of the two distributor rotating beds at different rotational speeds,liquid volumes and gas volumes are compared through experiments.Experiments show that the pressure drop of the wet bed of the central tube type is generally about 10.87% higher than that of the T-shaped tube type;the dehydration equilibrium degree is generally about 9.14% higher.The effects of four gas inlet modes and three gas guide vanes on the pressure drop and gas distribution uniformity in the dry bed of the rotating bed were studied through numerical simulation under different rotational speeds and gas volumes.At the same time,experiments were carried out to verify the simulation results.Experiments show that: in the three radial inlet rotating beds,the dry bed pressure drop at the baffle inlet and the baffle opening inlet is 4.18%and 2.32% higher than the radial inlet,and the dehydration equilibrium degree is 3.41% and 0.36% higher;In the rotating bed with different guide vanes,the dry bed pressure drop of 90°guide vane,45° forward guide vane and 45° counter flow guide vane is 4.95%,2.06% and 2.95%higher than those without guide vane.The dehydration equilibrium degree is 1.75%,1.37%,and 2.20% higher.The pressure drop and dehydration performance of the rotating bed before and after optimization under different operating conditions were compared through experiments.After optimization,the wet bed pressure drop of the rotating bed decreased by 4.34% compared with that before optimization,and the dehydration equilibrium degree increased by 16.55%compared with that before optimization.It is determined that the optimal rotational speed of the rotating bed after optimization is 800 rpm,the optimal liquid volume is 350 L/h,and the optimal air volume is 3500 L/h. |
PDF Full Text Request