Results 1 to 10 of about 83 (75)
Meikuang Anquan, 2023 In order to solve the problems of dust pollution, poor lubrication of screw motor and overtemperature in the hole during air directional drilling in broken soft coal seams, an intelligent multifunctional dust removal system was developed for the first ...
LI Kun, ZHANG Jie
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The key technology of lubrication for screw motor in air directional drilling
Meikuang Anquan, 2023 When the air directional drilling technology is used for drilling construction, whether the screw motor can be well lubricated is a key factor affecting its life.
LI Kun
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Minimum wind flow of air directional drilling technology in soft-fragmentized coal seam
Meikuang Anquan, 2021 In order to solve the problem that it is difficult to determine the range of the minimum wind flow of air directional drilling technology in soft-fragmentized coal seam, in this paper, loading of cuttings in air drilling is analyzed, and the critical ...
SUN Lihai
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Meikuang Anquan, 2022 In order to study the effect of particle size and air volume on the deposition, migration and distribution law of pulverized coal in the annulus of drill pipe and hole wall, the Euler-Euler model is used to numerically simulate the gas-solid two-phase ...
NIE Chao, WANG Yi, YAO Yafeng
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ProcessesAbundant industrial experiences have shown that directional air drilling technology is effective for gas drainage when drilling broken and soft coal seams. In this paper, the Eulerian–Eulerian model was used to simulate the gas–solid two-phase flow behavior of compressed air transporting coal dust in broken soft coal seams. The relationship between the
Xianyu Yang
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Meikuang Anquan, 2022 In view of the characteristics of large coal dust production, fast flow rate and high gas content in the air directional drilling of broken soft coal seam, the dust removal device of negative pressure suction and classification purification was designed ...
CHU Zhiwei
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Meikuang Anquan, 2022 In view of the common use before mining at 402 face in Tingnan Coal Mine, there are some problems in the process of pressure relief drilling, such as high drilling cost, long construction period, drilling deviation, which will cause air leakage in the ...
SHEN Jianting, WANG Fei, HUANG He
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Gong-kuang zidonghua, 2020 In view of problems of rotary drilling technology for soft-fragmentized coal seam, such as shallow borehole completed depth, uncontrollable borehole trajectory, low drilling efficiency and poor gas drainage effect, pneumatic directional drilling ...
KONG Qingjun, CHU Zhiwei
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Study on long drilling long-distance fixed-point gas content measurement
Gong-kuang zidonghua, 2021 The sampling time of long drilling fixed-point gas content measurement is long. And it is unable to measure the gas content in coal seams accurately due to the absence of desorption on site. In order to solve the above problems, a method of using analogy
ZHANG Jianguo1 +3 more
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Dust Control Technology in Dry Directional Drilling in Soft and Broken Coal Seams
Energies, 2022 High rate of dust generation and serious dust diffusion in dry directional drilling in soft and broken coal seams (SBCS) have long been critical problems in the mining process.
Dongmei Wu, Jie Gao, Ke Lu
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