The Simulation And Optimization Analysis Of The Mixer

The mixing of powder materials is a very important process in industrial production.It has been widely used in chemical industry,metallurgy,pharmacy,papermaking,food and wastewater treatment.This paper explores the movement of the particle material in the mixing machine and simulate the particle material movement based on the discrete element method.The main purpose of this paper aim to provide the guidance to the optimization of the mixer by researching the influence of different structure of the mixer and different working state.The main contents of this paper are as follows:1.Preliminary exploration of the movement of particle material by discrete element method.During the working process,the working state affect the mixing.According to the actual situation of material movement in the mixing machine and material properties of the particle material,doing numerical simulation of mixing machine at different working state by using EDEM and acquiring the best working state by analyzing the result;2.Optimizing the structure of stirring blades.There are a lot of parameters will influence the efficiency such as speed,filling rate,leaf blade configuration,leaf number,mixing canister tube length and tube diameter,etc.in the mixer.It is a difficult point in the study of this article that these parameters are interfere with each other when doing further study.In this paper,the structure of the mixer,especially the structure of the mixing blades will be simplified according to the flow of the material field in the mixer.at the same time orthogonal analysis was carried out on the key parameters of the mixing blade,mixing the sensitivity of the key parameters,analyzes the key parameters of the mixing blades for the influence of the mixing efficiency,and then obtain the optimal solution;3.Exploring the relationship between the number of mixed blades and the mixing efficiency.Due to the movement condition in the material field in the mixing machine is very complicated,when multiple mixing blades installed on the stirring shaft,the mixing efficiency and the number of the mixing blade is not simple linear superposition,therefore,this article will be simulated under different mixing blade number of combinations,a mixture of mixing equipment efficiency,material field is analyzed with the mixing time and mixing blade number show cyclical changes;4.The effect of reverse blade on mixing was studied by comparative study.Establishing the mixer which equipped with different mixing blade and comparing the mixing situation between the mixer which was equipped with the reverse mixing blades and the mixer which was not equipped the reverse mixing blade by using numerical simulation,through the result,it was found that average axial displacement are much smaller than the mixer which was not equipped with the reverse mixing blades.Mixing uniformity was slightly higher than the mixer which was not equipped with the reverse mixing blades.In order to avoid the mixing uniformity of the particle material is not enough because of the time,installation reverse mixing blade is helpful for improving the efficiency of mixing.