Study on the law of airflow-coal dust escape and prevention technology in fully mechanized mining face based on multiple reference frame model[J]. Journal of Mine Automation.
Citation: Study on the law of airflow-coal dust escape and prevention technology in fully mechanized mining face based on multiple reference frame model[J]. Journal of Mine Automation.

Study on the law of airflow-coal dust escape and prevention technology in fully mechanized mining face based on multiple reference frame model

  • During the coal cutting process of a fully mechanized mining face shearer, significant turbulent wind is generated, causing variations in wind speed within the mining area and inducing lateral diffusion of dust particles towards the pedestrian area. To investigate the influence of cutting-induced turbulent wind on the lateral diffusion of coal dust, a Multiple Reference Frame (MRF) model was employed to simulate the coal cutting process with rotating drums. Numerical simulations were conducted to study the coupled airflow-coal dust transport patterns in fully mechanized mining faces under different coal cutting conditions, analyzing the airflow distribution and dust concentration distribution within the working face. Based on the research findings, a dust source tracking and spraying technology for shearers was developed, and its application effect was evaluated through actual measurements of coal dust concentration, while also validating the accuracy of the numerical simulations. The results indicate that the cutting-induced turbulent wind generated by the rotating drums under different coal cutting conditions causes the airflow to deflect towards the pedestrian area, with lateral deflection velocity exceeding 0.54 m/s. Compared to upwind coal cutting, the lateral deflection effect of the cutting-induced turbulent wind on the airflow is more pronounced during downwind coal cutting. Additionally, during the coal-cutting process, the drums entrain surrounding airflow, causing it to deflect towards the drum-coal wall side. This deflection is more evident during upwind coal cutting, with lateral deflection velocities of the airflow surrounding the drums exceeding 0.50 m/s. Under the influence of the cutting-induced turbulent wind, dust particles diffuse towards the pedestrian area, resulting in dust clusters with concentrations exceeding 300 mg/m3 in this region. Lateral dust diffusion is more significant during downwind coal cutting. In response, a dust source tracking and spraying dust suppression technology for shearers was developed, achieving a dust suppression rate of 83.68% after field application.
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