Research On A Small Dry Dust Collector Suitable For Local Dust Removal In Mines

Straight-through leaf micro-cyclone group dust collector is suitable for the initial dust removal of the working place with large dust concentration restricted space of the mine,and has the characteristics of compact structure and no need to clean.At present,there are few relevant theoretical studies on the straight-through leaf micro-cyclone group,and its use conditions and internal flow field lack relevant technical guidance.This paper focuses on the above problems of the straight-through leaf micro-cyclone group dust collector,using numerical simulation and experiment to study the dust removal efficiency and internal air flow distribution under different conditions,providing a theoretical basis for its optimal design.On this basis,it is combined with the filter cartridge to conduct a preliminary test of dust removal efficiency.Using the combination of numerical simulation software and experiment,the internal flow field of the straight-through leaf micro-cyclone group dust collector was calculated,and the effects of flow rate and air extraction rate on the dust removal efficiency were analyzed.Finally,the joint working characteristics of the straight-through leaf micro-cyclone group and the filter cartridge are studied.The numerical simulation results show that the straight-through leaf micro-cyclone group has a dust removal efficiency of 99.9%for dust with a uniform particle size of 10-50μm,and gradually reduces the dust removal efficiency for dust with a uniform particle size of 50-200μm from 99.9%to 85%,And the flow rate is less than or equal to 2000m³/h,the reunion of fine particles is obvious.For the dust with the same distribution as the experimental dust d₅₀=10μm,the simulation calculation results that the straight-through leaf micro-cyclone group has the best dust removal efficiency at an air volume of 1602⁴165m³/h and air pumping rate of 5%.Through further experimental research,it was found that when the air volume is1602m³/h and the dust concentration is 200¹200mg/m³:under the condition of no air pumping,the dust removal efficiency of the straight-through leaf micro-cyclone group to the coarser dust of d₅₀=33μm The best,the dust removal efficiency of the dust with a concentration of 600¹000mg/m³ is relatively stable;under the condition of air pumping,the dust removal efficiency of the straight-through leaf micro-cyclone group for the dust of d₅₀=10μm is 79⁹4%,and When the dust concentration is 1000mg/m³ and the air pumping rate is 5%,the dust removal efficiency can reach 94%;under the conditions of air pumping,for the fly ash of d₅₀=33μm and the glass beads of d₅₀=48μm,The dust removal efficiency of the straight-through leaf micro-cyclone group is less affected by the dust concentration and more affected by the air pumping,and the dust removal efficiency is best when the air pumping rate is 3%.When the straight-through leaf micro-cyclone group is used in combination with the filter cartridge,the dust removal efficiency reaches 99.99%,and the average emission concentration meets the national standard.The overall combined dust collector can work continuously for595 minutes without clean,however,there is too much system resistance,and the joint working characteristics of the dust removal system still need to be further optimized.