Study On Structure Optimization And Performance Of Concurrent Flow Tray

The dual-flow tray usually use the no downcomer and multi channel design.gas and liquid go through the channel.Dual-flow tray has advantages of simple structure,large capacity,low pressure drop,and anti clogging performance.So it's widely used in absorbing,washing,dusting and other fields.using gas-liquid cocurrent operation.when the gas flux is larger,using gas-liquid cocurrent operation the dual-flow tray is prone to flooding and entrainment.Based on the excellent properties of the dual-flow tray using gas-liquid cocurrent operation,the tridimensional rotating sieve tray is a new type of column internals the independent designed by Zhang Shaofeng research group in Hebei University of Technology.Compared with the single swirl plate,plate and conventional stereo wear plate,tridimensional rotating sieve tray has the advantages of large circulation area,good mass transfer effect,lower pressure drop,and large processing capacity.Meanwhile,the flooding and entrainment phenomenon don't occur for gas-liquid flow,the tray has been widely used in industrial production.The gas phase flow field inside of the plate has an important influence in the optimization design,scale-up predictions and strengthening the gas-liquid absorption mass transfer.And dry plate pressure drop gas phase is an important the part of wet tray pressure drop informed by gas-liquid two-phase.Preliminary experimental study only measured the dry plate pressure drop,didn't make analysis of gas flow field characteristics in the tridimensional rotating sieve tray.The paper utilize the STAR-CCM+ software numerical simulation of gas flow field in the tridimensional rotating sieve tray was investigated on the basis of preliminary experimental study.The pressure distribution and velocity vector distribution of the longitudinal and circumferential position of the tray under different kinetic energy factor F were investigated,in order to provide reference for the analysis,design,and structure optimization of gas liquid two phase flow.The simulation results showed that,the space of tridimensional rotating sieve tray mainly existed two flow ways that perforation flow closing to sieve plate wall and rotating flow between the two sieve plate;the pressure difference between the sieve plate sides was the main reason of perforation flow,and gas flow process in tridimensional rotating sieve tray was divided into rotary and swirl development stage.The gas flow field of the 8 plate is similar to the 12 inside the sieve plates.But the swirl gas is more,the perforated gas is less,and dry plate pressure drop is below 8 plate pressure drop.When the gas flows through the first layer of the plate,the gas flow is similar to that in the Twin Towers plate.For installation mode,cyclone developed more and more fully.Reverse installation,the gas flow experienced to the spin up state and a swirl development stage with sieve plate rotation.The regional velocity was increased with the increase of gas kinetic energy factor,but the curve distribution trend is basically unchanged.The research carried out in this work provided an effective method for the simulation of gas flow field in tridimensional rotating sieve tray.The results are helpful to the structural optimization and large-scale designing.Also,the work provided the foundation for further research.