TANG Jian-xin, JIA Jiang-qing, HU Guo-zhong, et al. Design and experimentation of high-pressure water jet set applied to incising coal seam in boreholes[J]. 2007, 28(7).
TANG Jian-xin, JIA Jiang-qing, HU Guo-zhong, et al. Design and experimentation of high-pressure water jet set applied to incising coal seam in boreholes[J]. 2007, 28(7).DOI:
In allusion to the problems of the low gas-penetration and low ratio of gas drainage during draining gas and prevention outburst
it is designed the high-pressure water jet installation of cutting coal which is installed in the draining bore
and tested the nozzle and the ejector in scene. The result showed that the effect of the coal cut by high-pressure water jet is the best when the angle of water jet is +100
the diameter of nozzle is 1.5mm
the cutting speed is 0.2m/min and the pressure of the pump is 30MPa; it is showed that the draining ratio is raised about 18.8% and the draining time is shorten over 90% when the coal is cut by the high-pressure water jet
too. Therefore
the technology is very important to the draining gas and preventing outburst.