Experimental investigation and application of mine airflow purification and reuse technology

Research of wet string grid dust removal vehicle and creation of dust control area on tunnel working face

“…Wetting fine wire air cleaning technology with high dust removal efficiency, low resistance and stable performance and other characteristics, which captures dust effectively by forming a dynamic water film through the wetting and coagulation of spray droplet groups and dust particles, as well as droplet groups on the fine wire surface causes collision, developing into a kind of promising engineering application. [18].…”

“…The water film ruptures under the action of wind flow, and continuously generates new water film under the action of continuous spray droplets. The water mist formed by the rupture of the string grid is defogged by the water baffle, which further separates the dust contained in the water mist and discharges clean air [22~24].3.3 Optimization of the operating parameters of the wet chord grid dust removal crawler vehicleThe formation and crushing of the water film on the surface and between the strings of the wet string grid are mainly affected by the water supply pressure of the nozzle and the filter wind speed of the string grid section.Due to the limited water supply pressure of the vehicle-mounted water pump, there are many impurities in the water source in the tunnel, and the nozzle with a small aperture is easy to be blocked, and the atomization effect is poor; The nozzle with a large pore size is selected, and the particle size of the spray droplet is too large, and it is difficult to form a water film between the string grids; Finally, a low-pressure atomizing nozzle with an aperture of 2.0 mm was selected, and the dust removal effect was significant when the water supply pressure was 0.6 MPa[18].Under different fan frequencies, the air volume inhaled by the dust collection port is different, which will lead to the difference in the filtration air speed of the wet chord grid section, which will affect the dust removal efficiency. The wind speed of the chord grid section under the conditions of 20, 30, 40 and 50 Hz was measured by the TSI air speed…”

Experimental study on a novel double Y-shaped filter and its dust removal characteristics

“…(Zhou &Qin 2021). They can be classified as dry or wet depending on whether or not water is utilized in the dust removal procedure (Li et al 2017, Wu et al 2021. Dry dust collectors are appropriate for some water-short mines, but they have a number of drawbacks, including high operational resistance, high construction, operation, and maintenance.…”