Research on dust control technology of dry directional drilling in soft-fragmentized coal seam

WU Dongmei; GONG Xiaobing; LU Ke; XING Pengchao

doi:10.19835/j.issn.1008-4495.2021.02.012

Mining Safety & Environmental Protection > 2021 > 48(2): 61-65. > DOI: 10.19835/j.issn.1008-4495.2021.02.012

WU Dongmei, GONG Xiaobing, LU Ke, XING Pengchao. Research on dust control technology of dry directional drilling in soft-fragmentized coal seam[J]. Mining Safety & Environmental Protection, 2021, 48(2): 61-65. DOI: 10.19835/j.issn.1008-4495.2021.02.012

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Research on dust control technology of dry directional drilling in soft-fragmentized coal seam

1. Yongcheng Vocational College, Yongcheng 476600, China;
2. CCTEG Chongqing Research Institute, Chongqing 400037, China;
3. Chongqing University of Science & Technology, Chongqing 401331, China

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Received Date: June 22, 2020
Revised Date: June 22, 2020
Available Online: September 16, 2022

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Abstract

Abstract

In view of the problem that dry directional drilling of soft-fragmentized coal seam produces large amount of dust and serious dust diffusion, a non-contact dust control technology scheme for drilling holes was proposed, and a prototype of dust collection cover was designed and developed. The process parameters affecting the dust control effect, such as the gap width between the dust collection cover and the drill rod, the air gap width of the sealing device, and the pressure of the dust control air curtain, were studied experimentally, and the optimum process parameters were obtained in this paper. The research results show that:when the gap width between the drill rod and the dust collection cover is 2.0 mm, the air gap width is 0.2 mm, the slag discharge gas pressure is 0.3 MPa, and the pressure of the dust control air curtain is 0.5 MPa, the dust mass concentration is reduced from 540 mg/m³ to 15 mg/m³, the dust control efficiency reaches 97.2%. The field application results show that the dust control efficiency can reach 98.3% after using the dust collection cover, and the dust control effect is good.
- soft-fragmentized coal seam,
- directional drilling,
- non-contact dust control,
- dust collection cover,
- dust control

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References

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