Electrostatic Separation Of Catalyst Particles From Slurry In Dynamic System

Fluid catalytic cracking slurry(FCCS)contains a large amount of saturated hydrocarbons and aromatic hydrocarbons,and is a high-quality raw material for the production of high-value products such as needle coke,carbon black,and carbon fiber.However,the catalyst particles in it will have a serious impact on its subsequent processing,and different products have different requirements for the content of catalyst particles.At present,the commonly used methods for removing catalyst particles include sedimentation,centrifugation,filtration and electrostatic methods.Among them,the electrostatic method is suitable for catalyst particles with small particle size and has high separation efficiency,and is especially suitable for working conditions with low solid phase concentration.Based on the principle of electrostatic method,this paper designs and builds a set of dynamic electrostatic separation device by itself.According to the influence of parameters such as voltage,filler amount and inlet flow rate on electrostatic separation efficiency,the experimental research under dynamic system is carried out,and COMSOL numerical simulation software is used to analyze The movement and adsorption of catalyst particles in the process of dynamic electrostatic separation are numerically calculated.The research results provide a theoretical basis for the industrial design and application of electrostatic separation devices.In order to study the adsorption law of catalyst particles in a dynamic system,a micro electrostatic separation device was designed and built by itself.It is found through experiments that the movement of the catalyst particles presents a certain law,and only part of the catalyst particles meeting the conditions will be adsorbed on the surface of the filler,that is,there is an "effective adsorption area".Through theoretical analysis and numerical calculation of the movement of the catalyst particles under the dynamic system,it is found that the catalyst particles mainly move under the action of drag force,pressure gradient force and dielectrophoresis force.At the same time,the size of the effective adsorption area also depends on the medium of the particles.The electrophoresis force and pressure gradient force,and the movement of the catalyst particles have an equilibrium point,can be used as a criterion to measure the size of the effective adsorption area.The research results show that the effective adsorption area decreases with the increase of voltage and ion carrier concentration.Through a combination of experiments and numerical calculations,the effects of parameters such as voltage,filler amount and inlet flow rate on the separation performance such as saturated adsorption capacity and separation efficiency were studied.The research results show that the saturated adsorption capacity of the device increases with the increase of the voltage and the amount of packing,and first increases and then decreases with the increase of the inlet flow;the separation efficiency of the device increases with the increase of the voltage and the amount of packing,and with the increase of the inlet flow Increase and decrease.When the processing capacity per unit time of the electrostatic separation device is greater than the number of catalysts entering the device,the separation efficiency can reach 100%;the lower the processing capacity per unit time,the faster the separation efficiency decreases with time.The research results of this paper will provide a theoretical basis for optimizing the structure of electrostatic separator,improving the efficiency of electrostatic separation and the industrial application of electrostatic method.