Study on the characteristics of compound dust source pollution and foam dust suppression technology in coal mine anchor excavation production

Abstract

To guard against the damage caused by the dust pollution of the shuttle driver in the anchor excavation production, the Discrete Phase Model(DPM)-Discrete Element Model(DEM) was constructed based on the gas-solid two-phase flow theory, the dust pollution characteristics of the shuttle transfer stage were numerically simulated, and a dual carborne combined foam dust suppression system was developed. The results showed that at the rear of the transfer machine, due to the reduction of the roadway section space during transferring made the wind velocity relatively maximum, and the space after transferring dispersed many cutting dust and transferring dust, resulting in the wind velocity after transferring was slightly smaller than before transferring, and the wind velocity difference was 0.18 m/s on average. The dust pollution in the operating environment of the shuttle driver before, during and after transferring was more serious, with 162.1 mg/m³, 340.7 mg/m³ and 540.8 mg/m³. There was variability in the particle diameter of dust generated by different processes, and smaller micron-sized dust particles were generated during transferring, of which respiratory dust below 7.07 μm accounted for up to 21% of the total. To reduce the high concentration of respiratory dust clusters, a strong wettability high-fold foam dust suppressant was prepared and applied to a dual carborne combined foam dust suppression system, and the average dust reduction rates of total dust and respiratory dust reached 91.9% and 93.6%, respectively.