| In order to investigate the hydrodynamic performance and optimize the structure of a new type of plug flow electrochemical reactor with mesh plate electrode,PIV experiment and phenol simulated wastewater electrolysis experiment were carried out in this paper.The experimental results show that the inlet jet will cause backflow and vortex in the area in front of the plate,which will make the flow in the reactor unstable and have a great impact on the flow of gas and liquid in the reactor.The increase of liquid flow rate will make the reactor flow field become unstable,which should not be too large or too small,which is one of the main factors affecting the flow in the reactor.The mesh structure of the plate will have a diversion effect after the liquid flows through the plate,and has a certain influence on the gas-liquid flow in the plate area.Bubbles in the plate surface,in low current intensity,the bubble number is less,the buoyancy,the flow of the escape of liquid flow has strong disturbance effect,strengthened the reaction and mass transfer process,with the increase of the intensity of electric current,a large number of bubbles floating and escape,the upper part of the air bubbles to escape gathered in reactor liquid level,hindered the flow of liquid phase plate area and update,weaken the reaction and mass transfer process of simulated wastewater experimental results also show that the reactor internal electric catalytic oxidation of phenol suffer indignities phase perturbation is larger,the influence of the mass transfer process so bubble flow is also one of the main factors influencing the flow reactor plate area;At the same time,the influence of plate arrangement was investigated in the simulated wastewater experiment.The experimental results showed that the arrangement of inclined plate could accelerate the renewal of the components around the plate,make the bubbles on the surface of the plate break off faster,increase the effective plate area and promote the reaction.Based on the experimental results of simulated wastewater,the change curves of phenol concentration and COD in wastewater were obtained,and the mass transfer coefficient was fitted.The experimental results show that the reaction efficiency and mass transfer performance of the new type of plunger flow reactor can be improved by changing the plate arrangement and the flow channel.In order to further explore the flow law and mass transfer law of the new type electrochemical reactor with grid plate plunger flow,3d CFD numerical simulation was carried out by using FLUENT ANSYS software.The simulation results of single phase flow show that the flow field in the reactor presents a stable plunger flow pattern.By comparing the simulation results with the experimental results,the reliability of the simulation method is verified.The flow field of gas-liquid two-phase flow in the reactor is simulated under the actual working conditions,and the results show that the gas has a great influence on the flow field,and too many bubbles are not conducive to the reaction and mass transfer.The flow field is mainly affected by the liquid phase flow when the gas phase velocity is small.The flow field and component distribution in a reactor with chemical reaction were simulated.The results show that the distribution of hydroxyl radicals on the surface of the plate is determined by the gas-phase flow and there is a reaction stagnation zone at the bottom of the reactor.The inclined plate promotes the electrochemical reaction and is an effective way to optimize the reactor structure.Through the analysis,the method of reducing gas production and accelerating gas discharge should be adopted to optimize the process,optimize the reactor structure,and reduce the disturbance effect of gas on the flow in the reactor,which is conducive to the stability of the flow pattern of the reactor plunger and the stable and efficient operation of the reactor. |
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