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Numerical simulation of influencing factors on dust movement during coal cutting at fully mechanized working faces

2014; University of Science and Technology Beijing; Linguagem: Inglês

Tan Con,

Drilling and Well Engineering

To resolve the problem of high dust concentration during the process of coal cutting at fully-mechanized working faces and obtain rational dust control parameters,as well as to meliorate working conditions,considering No.2225 working face in Xingdong Mine as a research background,numerical simulation was performed using FLUENT software to track dust movement laws during coal cutting at the fully-mechanized working face based on the theory of gas-solid two-phase flow.Compared with the actual dust concentration distribution in the mine,the simulation results are basically consistent with the actual data.The wind velocity at the fully-mechanized working face,shearer drum rotation speed,valve speed,and wall condition mainly affect the dust concentration distribution at the fully-mechanized working face.It is concluded that the dust removal effect is better when the average wind velocity is 1.4 m·s- 1,the drum rotation speed is no more than 2.5 rad·s- 1,and the valve speed is less than1.5m·s- 1.Meanwhile,sprinkling water,which can keep the coal wall moist,plays a significant role in capturing dust.