Optimization and Research on Borehole Water Injection Parameters of Coal Seam in the 10604 Working Face of Malan Mine
In response to the problem of generating a large amount of coal dust during the stoping of the 10604 working face in Malan Mine,through using the method of COMSOL Multiphysics numerical simulation software,the coal seam water injection effects under different borehole water injection parameters such as water injection pressure and water injection borehole diameter are numerically simulated and analyzed and optimized.A set of optimal water injection technology schemes suitable for the working face is proposed to significantly reduce the dust production quantity of this working face.The relevant research results indicate that with the extension of water injection time,the water injection effect enhances and reaches saturation state at around 30 hours;With the increase of borehole diameter,the water injection effect is also enhanced,from 1.52 m of effective wetting radius when d=0.05 m to 2.78 m when d=0.2 m.However,considering that hole collapse may be caused when the borehole diameter is too large,a diameter of d=0.06 m is chosen;With the increase of water injection pressure,the water injection effect is also enhanced.The effective wetting radius of water injection at P=6 MPa increases from 1.33 m to 2.95 m at P=12 MPa.Combined with the on-site conditions,the water injection pressure P=12.5 MPa is ultimately selected.Finally,the accuracy of the simulation results is verified through on-site application.
coal dustcoal seam water injectionborehole water injection parameternumerical simulation
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