Numerical simulation of the dust movement and particle size distribution during dry drilling in a coal seam

ZHANG Fuhong; CHEN Jushi; GAO Yang; JI Yinfeng

doi:10.16511/j.cnki.qhdxxb.2018.22.046

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (10) : 872-880. DOI: 10.16511/j.cnki.qhdxxb.2018.22.046

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Numerical simulation of the dust movement and particle size distribution during dry drilling in a coal seam

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Abstract

This paper describes a numerical simulation of the dust movement during dry drilling in a coal seam to reduce dust pollution and improve dust control in a mine. SolidWorks and DesignModeler are used to build the models with Fluent then used to calculate the flow field. The results show that the jet flow from the cyclic slits and the continuous rotation of the drill pipe spew dust particles out from the bottom hole at high speed in the direction of the orifices. As the dust particles move away from the drill, the dust diffusion and mass flow rate gradually decrease. The R-R distribution index increases slowly with the median dust particle diameter and the R-R characteristic size first increasing and then decreasing. The dust concentration gradually increases to a maximum and then fluctuates a small amount around the maximum over time. The dust mass concentration along the seam quickly rose to a maximum, then dropped sharply and then more slowly. The results are then used to determine the structural parameters of dust control equipment during dry drilling in coal seams.

Key words

dust / dry drilling in coal seams / movement regularities / particle size distribution / numerical simulation

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ZHANG Fuhong, CHEN Jushi, GAO Yang, JI Yinfeng. Numerical simulation of the dust movement and particle size distribution during dry drilling in a coal seam[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(10): 872-880 https://doi.org/10.16511/j.cnki.qhdxxb.2018.22.046

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