Study on Dust Pollution Law and Multi-section Fog Curtain Dust Control Technique at Transfer Point of Inclined Roadway
In view of serious dust pollution problem in sloping road transfer point,the geometric modelling of the No.3 transfer point of Qipanjing Coal Mine was carried out by using COMSOL software,and based on the particle tracking model of Computational Fluid Dynamics(CFD),finite element method,and k-ε turbulence model,the distribution of wind flow stream-line,the distribution of velocity multicut section and the trajectory of dust particles in the No.3 transfer point were computed,the changes of wind flow and dust transport law were investigated in the No.3 transfer point during production work.The wind flow changes and dust transport law at the No.3 transfer point during production work are studied,and a multi-section fog cur-tain dust control technology is proposed,which is based on principles of spiral fog curtain dust control and supersonic dust iso-lation,can form a long-distance and wide coverage fog curtain to wrap dust particles to maximum extent to achieve highly effi-cient purification of dust,and finally,through dust control experiments and on-site application of the technology at No.3 trans-fer point of Qipanjing Coal Mine,the high efficiency of this technology in terms of dust reduction characteristics and reliability are verified.The study results show that:the wind flow distribution is mainly affected by combined effect of belt speed,traction and induced airflow,and is distributed in layers along horizontal and vertical directions,forming a dense vortex with an average speed of 0.5 m/s.Dust is easily affected by vortex spreading in all directions,it is mainly distributed on downwind side,the particles of sizes between 5 μm and 15 μm are more susceptible to diffusion of wind flow,and are gathered in height of the workers'respiratory zones,which is seriously contaminated.After the dust control experiment and on-site application of this technology,the dust reduction efficiency of whole dust and exhaled dust is as high as 93.65%and 85.59%respectively.
transfer pointnumerical modellingmulti-section fog screendust transportdust removal efficiency
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