Research on the blowing-spraying synergistic dust removal technology for clean environment in large-scale mechanization coal mine

In this study, we developed a blowing-spraying synergistic dust collector installed on a hydraulic support with the aim of reducing dust pollution at fully mechanized faces. A high-speed airflow in the same direction of the dust collector's spray improved its effective range and created high-quality spray and wind curtains. These curtains covered the space between the fully mechanized face coal wall and the hydraulic support column, thus promoting dust removal. A numerical simulation of the spray of the blowing-spraying synergistic dust collector was conducted based on a local model of the full scale fully mechanized face. The results showed that, when the hydraulic motor was disabled and the spray pressure increased from 2 to 5 MPa, the proportion of area covered by the high-quality spray field (where the concentration was > 10 g/m3) in Section Q rapidly increased from 3.62% (2 MPa) to 32.47% (5 MPa). When the hydraulic motor was enabled, the proportion of area covered by the high-quality spray field in Section Q increased to 85.6%: indicating that the effective coverage of the spray field in the fully mechanized face was greatly enhanced under the action of the high-speed airflow. Application and dust measurements were conducted in the 22,104 fully mechanized face of Shangwan Coal Mine. After the activation of blowing-spraying synergistic dust collectors at the front and rear drums of the shearer, the respirable dust concentration at the place of the shearer driver's location diminished to 19.7 mg/m3 and the dust removal rate became 90.3%, indicating an effective dust removal.

Automated summary

This study developed a blowing-spraying synergistic dust collector to reduce dust pollution at fully mechanized faces, utilizing high-speed airflow to improve the effective range and create high-quality spray and wind curtains for effective dust removal.