Research on the transportation mechanism of drum cutting dust and dust control technology in fully mechanized mining faces

Drums produce a large amount of dust during coal cutting operations, causing great harm to underground workers and the environment. To solve the problem of dust pollution from the drum cutoff, the transportation law of dust from the front drum and the double drum cutoff was simulated and studied. The results show that the front drum cutting dust produces an obvious sedimentation phenomenon of particle size grading during transportation, and the dust distribution is relatively greater in the space below the synthesized mining face. The dust transportation law is basically the same for the double drum and the front drum, and although the double drum cutoff dust concentration increases, it is not a simple twofold relationship. A high-pressure integrated spray dust control device for drum cutoff dust was developed, the factors affecting the dust removal performance, such as the structure type and jet water velocity, were analyzed, and the staggered structure type and 6 m/s jet water velocity were determined to be the optimal dust removal parameters. Field testing of the optimum parameterized unit was also conducted. The results show that the dust removal efficiency is close to 80% for both total and respiratory dust, providing an effective method for the control of drum cutoff dust.