露天深孔爆破自由面前水袋爆炸降尘关键参数研究

本文采用ANSYS Fluent数值软件与现场实验相结合的方法研究了水袋降尘原理，重点分析了水袋起爆时差与间隔距离对降尘效果的影响。结果表明:第一排水袋起爆与深孔爆破时差在1~1.5 s时，爆破水雾浓度较大且扩散范围最广，能够与爆破产生的粉尘云充分接触；第一排与第二排水袋起爆时差在0.5~1.0 s时，水袋沿途降尘效果较优；两水袋间隔距离在10~15 m时，爆破雾化的覆盖面积大，爆破后粉尘的捕捉能力更好。采用水雾捕尘措施后，50 m处落尘量与未采取措施相比增加了27 %，100 m处落尘量增加12 %，150 m处落尘量减少16 %，爆后50 s粉尘浓度降低36 %。水雾与尘粒作用，加速了尘粒的沉降，近区落尘量增加，远处落尘量减小。

Study on key parameters of water bag dust removal in open air deep hole blasting

In this paper, the principle of water bag dust removal is studied by using ANSYS Fluent numerical software combined with field experiment.The influence of the detonation time difference and the distance between the water bag and the dust removal effect is analyzed emphatically.The results show that when the time difference between the first row of water bag initiation and the deep hole blasting is within the range of 1~1.5 s, the blasting water mist concentration is larger and the diffusion range is the widest, enabling the blasting water mist to fully contact with the dust cloud diffused over.When the detonation time between the first row and the second row of water bags is 0.5~1.0 s, the dust removal effect along the water bags is better.When the distance between the two water bags is 10~15 m, the coverage area of blasting atomization is larger, and the ability to capture dust after blasting is better.The field experiment results show that the dust fall at 50m increases by 27 %, the dust fall at 100 m increases by 12 %, and the dust fall at 150m decreases by 16 %.The effect of water mist and dust particles accelerates the settling of dust particles, and the dust fall in the near area increases, while the dust fall in the distance decreases.The dust concentration of the 50s after explosion is reduced by 36 % after the adoption of water mist dust capture measures.