Research On Dust Distribution Law And Dust Removal Optimization At The Feed Port End Of Intelligent Throwing Equipment

With the increasing requirements for coal mining efficiency and modernization,the requirements for coal sorting are also becoming higher.The sorting industry has huge development space,and intelligent throwing equipment is gradually emerging in China.During the operation of intelligent throwing equipment,a considerable amount of coal dust is generated,which not only poses a hazard to the environment but also affects the subsequent sorting accuracy of equipment.Currently,most enterprises set up ventilation,dust removal and suction devices for throwing equipment,but the dust removal efficiency is low and long-term use can affect the working efficiency of equipment.Therefore,the research work of this article mainly starts from the perspective of practical situations.Taking the dust generated in different suction hood structures and positions of the feed bin of a certain enterprise’s intelligent throwing equipment as the research object,the coal dust concentration and airflow movement were studied.Firstly,the geometric model was established and the control equations of the numerical theoretical model were determined based on the on-site investigation.Then,the FLUENT software was used to simulate the numerical model of the intelligent throwing equipment under the original dust removal system,and the reasons for the poor dust removal effect under the original working conditions were analyzed.Then,optimization strategies such as the inclination angle,size and height of the suction hood port,and the position of the suction hood were proposed to achieve better dust removal effect.The diffusion of coal dust and the distribution of airflow in the feed bin were analyzed,and the optimal dust removal conditions of the equipment were determined to provide decision-making references for dust control of the throwing equipment.Through analysis of the simulation results,it can be seen that the dust removal effect of the original dust removal equipment in the feed bin of the intelligent throwing equipment is not ideal,and a large amount of dust is suspended inside the equipment,which can easily affect the sorting accuracy of the equipment in subsequent work.Through the method of controlling variables,it is found that the size of the suction hood,the inclination angle of the suction hood,the ventilation volume,the height of the suction hood and the placement position of the hood not only affect the diffusion of dust but also the movement of the airflow in the feed bin.When the position of the hood is fixed,the larger the ventilation volume,the lower the dust concentration in the feed bin of the intelligent throwing equipment.The dust concentration in the feed bin decreases as the size of the hood opening increases.When the size of the suction hood is 1.2 m×1.2 m,it has the best effect on capturing dust.When the size of the opening is0.8 m×0.8 m,there is a high-concentration dust area in the feed bin and the dust cannot be discharged,and the diffusion area of the dust is the largest.When the inclination angle of the suction hood is 30°,the dust concentration in the feed bin is lower than that of 15°and 45°.Therefore,when the position of the hood is fixed,the optimal dust removal effect is achieved with a ventilation volume of 12000 m~3/h,a hood size of 1.2 m×1.2 m,and an inclination angle of 30°.When studying the variable of the hood position,at a constant ventilation volume,the height of the suction hood,the distance between the suction hood opening and the feed end,and the size of the suction hood can also affect the distribution of dust in the feed bin.The dust removal effect is better when the distance between the suction hood opening and the feed end is 0.35 m than when it is 0.05 m or 0.2 m.The dust concentration in the feed bin is the lowest when the height of the suction hood is 0.08 m and the highest when it is 0.2 m.Therefore,the optimal dust removal effect is achieved with the suction hood opening 0.35 m from the feed end,a hood size of 1.2 m×1.2 m,and a suction hood height of 0.08 m.After optimizing the suction hood opening,the ventilation condition significantly reduces the area affected by dust,effectively solving the problem of dust distribution in the original state.