CFD Simulation Study On Flow Field Of Spiral Ventilation And Ability Of Dust Collection In Machine Operating Work Face

At present,there are some problems such as large dust production,high coal dust concentration,great harm and low efficiency of dust removal in machine operating work face in our country.In order to improve working environment of machine operating work face,numerical simulation contrastive study far-pressing-nearabsorption and mural chimney spiral flow ventilation in machine operating work face from two aspects of theoretical analysis an numerical simulation.Firstly,this paper research on the mechanisms of dust production and diffusion in machine operating work face,research shows that tunnel boring machine digging work way produce a large amount of coal dust inevitable and pick of tunnel boring machine grind with coal produce a large number of tiny dust.Secondly,Standard k-? mode for far-pressing-near-absorption hybrid ventilation and Realizable k-? mode for mural chimney spiral flow wind are established,by using FLIENT software numerical simulation the two ventilation modes,get the wind field velocity vector nephograms and dust concentration distribution nephograms.The study found that spiral flow movement along the direction of tunnel wall after mural chimney installed in the front of forced duct,diffusion range of dust in the roadway is smaller and dust concentration decreased,improve the efficiency of dust removal in machine operating work face.Finally,by use the Eulerian-Lagrangian method,pressure and velocity coupling way chose SIMPLE solution,numerical simulation deposition dust of driving roadway secondary flying.The results show that when forced duct ventilation quantity is lower than 270 min/3m,the dust mainly distribute below 0.5m,the height of the dust can be controlled in the front of the forced duct.