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

Abstract

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.

Keywords

• explosion water mist
• water bag
• numerical simulation
• delayed exploding time
• spacing distance