Abstract
Dust is one of the main pollutants in coal mines, which seriously affects the physical and mental health of workers, as well as the safe production in underground mines. Dual-radial swirl shielding ventilation is a new ventilation method for a fully mechanized excavation face and can effectively reduce the dust concentration in the underground. The dust control effect of dual-radial swirl shielding ventilation is mainly affected by the thickness and integrity of the shielding air curtain, as well as the disturbance of the flow field near the air curtain. By changing the blowing and suction air volume ratio of the air duct, the strength of the radial air curtain can be improved, and the dust control effect of the dual-radial swirl shielding ventilation system can be effectively improved. In order to determine the optimal operating parameters of the dual-radial swirl shielding ventilation system, a numerical simulation method was used to conduct an in-depth study on the blowing and suction air volume ratio of the system. The results showed that when the blowing and suction air volume ratio of the air duct was 1.5, the radial air curtain had the highest strength. Under this condition, the dust concentration at the driver’s position of the roadheader was the lowest, and the dual-radial swirl shielding ventilation system can achieve an ideal dust control effect.
Highlights
Coal resources are an important energy mineral resource
The validity of the model was verified by a custom-designed experimental model which is geometrically proportional to the real roadway
Under the same working conditions with the numerical simulation, the experimental results and numerical simulation results were compared to verify that the numerical model of the dual-radial swirl shielding ventilation system was effective and can be used for more indepth researches on system dust control optimization
Summary
Coal resources are an important energy mineral resource. China’s total coal consumption accounts for about 60% of the country’s total energy consumption [1, 2]. The wall-attached air duct can greatly improve the working environment of the fully mechanized excavation face, prevent gas accumulation on the top of the roadway, and ensure the safe production of the mine [25, 26]. In order to solve the problems of high dust concentration and turbulent air organization in the fully mechanized excavation face, the wall-attached swirl ventilation system was improved to form a new type of ventilation system for the fully mechanized excavation face, i.e., the dual-radial swirl shielding ventilation system. A simulated tunnel model was built to scale, and the airflow field structure and dust movement rules in the roadway under the dual-radial swirl shielding ventilation system were studied using Fluent software, especially the dust concentration in the working area of the roadheader driver. Numerical simulations were used to study the dust control effect of the dual-radial swirl shielding ventilation system under different air duct blowing and suction volume ratios, and the working condition parameters for the best dust control were obtained
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