Abstract: Coal yard is the main dust source for coal dust diffusion from the mining area to the surrounding environment. Using dust suppression nets and dust suppressants in the coal yard of the mining area can reduce pollution from coal dust. To optimize coal dust suppression measures in the coal yard, a wind tunnel simulation test was conducted to compare the amount, concentration, and wind speed of coal dust blowing through flexible polyester dust suppression nets in various layouts and the performance of three composite dust suppressants at various ratios. The results show that the best dust suppression was achieved through the spraying of 30 g·L^-1 environmental friendly dust suppressant and use of a double-layer dust suppression net. The findings indicate that spraying environmental friendly dust suppressant at a concentration of 30 g·L^-1 resulted in a threshold wind velocity of coal dust that was 17% higher than that of a double-layer dust suppression net, while the double-layer suppression net reduces the quantities and concentrations of coal dust. Altogether, spraying an environmental friendly dust suppressant at a 30 g·L^-1 concentration is effective in accounting for the threshold wind velocity of coal dust, while a double-layer dust suppression net is the optimal measure for reducing the quantity and concentration of coal dust.

Key words: coal dust, dust concentration, wind tunnel test, dust suppressant, dust suppression net