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Experimental study on a rapid air purification system for deep mine circular ventilation

  • English Author:
  • Xie Yixiao¹, Nie Xingxin¹, Zhang Xin¹, Sun Zeyu¹, Zhao Yidi¹, Zhang Chenyu¹, Zhao Linhai², Li Zongli²

  • Unit:
  • (1. School of Resources Engineering, Xi’an University of Architecture and Technology; 2. Baoji Erlihe Mining Co., Ltd., NWME Group Ltd.)
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Abstract:

To improve the air cleanliness of controllable circular ventilation in deep mines and to accelerate thefiltration and discharge of blasting⁃related dust and toxic gases, a rapid air purification system combining a micro⁃nanobubble water spray system and a water bath wirecarbon system was proposed. Based on a self⁃designed experimentalplatform for rapid air purification, micro⁃nano bubble water and atomizing nozzles were investigated to determine theoptimal nozzle aperture for the best atomization performance. The dust suppression efficiency of tap water and micro⁃nanobubble water sprays was compared. Single⁃factor experiments were conducted using a wet spray fiber grid and a carbonadsorption mesh to identify optimal inpidual performance parameters. Finally, an optimal combination purificationexperiment was performed using the best⁃performing parameters. The results show that under the same operating condi⁃tions, a pressure fan⁃shaped nozzle with a 0.4 mm aperture achieved the largest atomization angle, reaching up to 90°.The dust suppression efficiency of micro⁃nano bubble water was consistently higher than that of tap water, and micro⁃nanobubbles more effectively captured respirable dust. Wet spray fiber grids with larger apertures formed larger water films,increasing the contact area with water⁃soluble gases and thereby improving filtration efficiency. Thicker activatedcarbon fiber cotton offered more pores and a larger surface area, significantly enhancing CO adsorption. The optimalparameter combination for the rapid air purification system was as follows: micro⁃nano bubble water as the spray medium;high⁃pressure nozzles with a 0.4 mm aperture and 3 MPa water supply pressure; wet spray fiber grid using double⁃layer10⁃mesh metal screen; and 5 mm thick activated carbon fiber cotton for the carbon adsorption mesh. Under this optimalconfiguration, the total dust and respirable dust removal efficiencies reached 72.83 % and 79.12 %, respectively, whilethe purification efficiencies for CO, H₂S, and SO₂ were 84.47 %, 78.56 %, and 55.42 %, respectively.

Keywords:

deep mining; circular ventilation; metal mine; rapid air purification system; blasting dust toxins; spraydust suppression; micro⁃nano bubble water; water bath wire mesh