Numerical Analysis Of Flow Field And Key Structure Of Gas-Solid Two-Phase Self-Circulating Dust Suppression And Dust Removal Device

The transport system is an extremely important link in the process of material transportation,and it is also the key structure of modern bulk transport equipment.With the development of modern production,the problem of dust pollution in transport system has been paid more and more attention by the country and people.The traditional transport system mainly relies on external power to guide the dust directional movement while controlling the range of dust movement,so as to avoid the free diffusion of dust.Although this method has good dust suppression and dust removal effect,but the production cost,energy consumption cost and maintenance cost is high,the reliability is relatively low.According to the actual working condition of transfer station,the team put forward and designed a new type of the circulation of dust suppression dust removal device,to insure the effect of dust dust suppression in not using external add power at the same time,based on the autonomous power control the movement of the dust in the material handling,make the dust removal effect than the traditional schemes at the same time to save energy and reduce cost.In this paper,based on the actual working conditions of a bulk material conveying system,the supporting self-circulation dust suppression and dust removal device is designed,and the model of the device is established with Solid Works software.Then,discrete element software EDEM was used to quantitatively analyze the properties of material flow under normal working conditions by using field transport and transportation parameters,and obtain the cross section shape and falling velocity range of material flow in the discharge pipe at each moment,which were taken as the entry boundary conditions of the dust removal device.Then,the discrete phase model(DPM)in the computational fluid dynamics software Fluent was used to calculate and solve the flow field distribution and particle trajectory in the device,and the main structure in the device was monitored,which proved the feasibility of the dust removal effect of the equipment.After that,the single variable method was used for numerical simulation of the main structure of the equipment,such as the return pipe and the exhaust pipe,to obtain the detailed impact of the structural parameters on the dust suppression and dust removal efficiency.At the same time,the influence of adding stress baffle in the negative pressure area to improve the dust removal efficiency was explored,and the initial optimization of the addition of stress baffle was made.Finally,the main reasons and the most susceptible positions of the equipment structure strength are analyzed,and the dust particle erosion wear at the corner and intersection of the exhaust pipe is simulated,and the change rule of erosion rate under different structural parameters is obtained.The fluid-structure coupling numerical simulation of the rigid dust curtain is carried out to obtain the stress and strain of the rigid dust curtain and the modal vibration under the working condition,so as to ensure that the structural strength meets the design requirements.