Research on the coupling diffusion law of airflow-dust-gas under the modularized airflow diverging dust control technology

Abstract

In order to guide the application of the modularized airflow diverging dust control technology in high-gas fully mechanized excavation roadways, this study established an airflow-dust-gas coupling migration model, and the influence law of the air-blowing volume Q b and the air-exhaust volume Q e on the airflow-dust-gas coupling diffusion in the roadway was simulated and studied. Through on-site measurement, the average relative errors of wind speed and dust concentrations were 7.35% and 10.62% respectively. Then, similar experiments were carried out to further prove the effectiveness of this technology. The results showed that this technology formed a dust-blocking air curtain through airflow diverging, the increase of airflow volume had little effect on the airflow structure and dust diffusion distance d f . Compared with the traditional technology, d f was reduced by about 79.3%. The increase of airflow volume reduced the dust concentration and gas concentration in local areas, and the gas concentration in the upper corner of the air-blowing side was reduced from 2.39% to 1.06%. The gas safety under this technology is better than the traditional technology, and the gas concentration under the traditional technology and this technology was roughly in the ranges of 0% ~ 0.48% and 0.96% ~ 1.44%, respectively. When Q b = 1260 m 3 /min and Q e = 1008 m 3 /min, the dust control effect and gas condition were better, which provides a theoretical reference for the application of this dust control technology in high-gas fully mechanized excavation roadways. • Guided the application of modularized dust control technology in high-gas roadway. • The law of air-dust-gas coupling migration under different air volume was obtained. • The airflow-dust-gas diffusion results of new and old technologies were compared. • The reference air volume considering dust control and gas safety was put forward.