About Analysis of gas leakage in mine rock drill
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6 FAQs about [Analysis of gas leakage in mine rock drill]
What is the mechanism of air leakage from drilling and extraction?
Mechanism of Air Leakage from Drilling and Extraction. In the process of gas extraction, the air outside the coal body is constantly mixed into the extracted gas flow through the fissure channel of the surrounding rock in the coal roadway, which reduces the gas concentration.
How to control air leakage during drilling and extraction?
Herein, we qualitatively analyze the mechanism of air leakage during drilling and extraction, verify the accuracy of the mechanism based on measured data at the site, and propose short-hole grouting and plugging of the coal wall of the roadway gang to control air leakage from the main channel in order to enhance the gas extraction eficiency.
What causes air leakage in a coal extraction borehole?
Secondly, due to the dynamic pressure disturbance from the extraction borehole and the coal matrix shrinkage, the cracks surrounding the borehole gradually develop, resulting in a decrease in air leakage resistance and an increase in air leakage.
Does air leakage restrict gas extraction in Qingdong coal seam?
Given that forming a normal hole in the prominent coal seam of the Qingdong Coal Mine is impossible and that air leakage leads to dificulties in prepumping gas in the coal seam, we selected coal seam 3# as the object of this study. First, qualitative analysis determined that the air leakage channel restricted efective gas extraction.
How does borehole pressure affect air leakage?
Different negative pressures of extraction have an impact on the air leakage in the cracks surrounding the borehole. Figure 7 illustrates the borehole drainage, including borehole gas flow, air leakage, and gas concentration, under different borehole negative pressures (13 kPa, 15 kPa, 17 kPa, and 20 kPa).
Does gas flow occur around drilled holes during coal seam extraction?
Liang et al. [ 18] constructed a multi-field coupling model incorporating stress–diffusion–seepage to investigate the gas flow behavior around drilled holes during coal seam extraction, focusing on the optimal spacing of boreholes for gas drainage.