Research And Application Of New Dust Collector Based On Coanda Effect

Mine dust is one of the main disasters in the coal mine,and respiratory dust is especially harmful to the physical and mental health of workers.Workers are prone to pneumoconiosis after long-term work in a dense dust environment,and dust accumulation is also easy to cause explosion accidents,posing a serious threat to the safety of mine production.Dust collector is one of the main dust removal technologies in coal mines at present.Dry dust collector can't remove toxic and harmful components in the gas.And the larger volume leads to the inconvenience of installation and movement.Wet dust collector needs to consume water compared with dry dust collector,and the power plant of existing dust collector generally uses electric parts.The working noise is large,which not only affects the work of workers,but also has potential electrical safety hazards for highly gassy mine.Therefore,based on the basic principle of Coanda effect,the basic structure of new dust collector is introduced.By controlling the variable method,the air extraction angle ?,outlet angle ?,the number of gas nozzles,the type of filter,the number of filter and the length of flexible air duct,the suction air volume and suction rate of new dust collector under different structural parameters is obtained,and the optimum structural parameters of new dust collector is determined.The optimum structural parameters of the dust collector are determined as follows: the inlet inclination angle is 15 degrees,the outlet inclination angle is 5 degrees,the number of nozzles is 36,the three-layer mesh filter,and the longer the telescopic duct is,the lower the suction rate is.Then the change rule of the suction rate under different wind pressures(flow rate)is studied.The relationship between suction air volume and gas pressure is approximately as follows: y(28)352.86x(10)12.818.Meanwhile,the spray device is installed inside the dust collector to capture and settle the dust.Combined with numerical simulation and experimental study,the influence of different spray location and spray pressure force(flow rate)on the suction rate and the range changes of spray under different spray pressure(flow rate)are studied.The results show that when the gas outlet pressure is 0.4 MPa,the relationship between the suction volume and the gas pressure is approximately: y(28)20.691x(10)163.15.Before the water pressure reaches 1.5MPa,the spray coverage radius increases with the increase of water pressure.After 1.5MPa,the radius is basically unchanged,while the spray length grows faster.On the basis of the above work,using numerical simulation software FLUENT,combined with the actual situation of fully mechanized excavation face,the airflow distribution and dust distribution in the roadway before and after the dust collector are simulated and analyzed.The results show that the dust collector can reduce the dust concentration at different locations of the roadway in varying degrees.After the dust removal efficiency of the dust collector itself was verified by experiment,the industrial text is carried out on the heading face of-830 m horizontal transportation roadway in Zhangshuanglou Coal Mine.The results show that the dust concentration of the roadway before and after the start-up of the machine is remarkable,and the maximum dust reduction efficiency reaches 80.7%.