Research And Design Of High Pressure Gas Screw Mixed Conveying Device For Granular Materials

At present,the main problems of particle conveying devices at home and abroad are material blockage,back-flow and particle breakage rate.In view of the above problems,this thesis designs a high-pressure air flow screw mixed conveying device for granular materials,which adopts the principle of gas-solid mixed conveying as a whole,and adds a gas-solid mixing valve in the key part of gas-solid mixing,which can effectively avoid blocking and back-flow.The research contents are as follows:(1)In this thesis,the particle conveying device is taken as the research object,and a key technology including gas source device,feeding device,conveying pipeline and gas-solid mixing valve is proposed.(2)In this thesis,the gas-solid mixing process is studied theoretically,and the gas-solid two-phase flow model is established.Aiming at the turbulence effect,the standard k-ε model and the shear pressure transfer(SST)k-w model are established to close to the real gas-solid mixing process.At the same time,the movement state and stress condition of the particle phase are analyzed,which paves the way for the parameter matching of the gas-solid mixing transportation in the future.(3)In this thesis,based on the principle of gas-solid mixed transportation,taking the transportation process in the mixing valve as the research object,the numerical simulation of gas-solid mixing valve with different structure and size is carried out by using FLUENT software,and the mixing effect and influence law are obtained.(4)In this thesis,a gas-solid mixing experimental platform is built to explore the influence mechanism of different parameters on the mixing and conveying process,verify and improve the simulation process,and complete the research and design of the particle conveying device,which has certain reference value and engineering significance for the research and development of bulk particle conveying field.