Dust Control Technology in Dry Directional Drilling in Soft and Broken Coal Seams

Abstract

High rate of dust generation and serious dust diffusion in dry directional drilling in soft and broken coal seams (SBCS) have long been critical problems in the mining process. To solve these problems, in this study, a dust hood was designed and applied to realize non-contact dust control in drilling holes. The optimal performance of the dust hood was achieved when different technical parameters, including the gap width between the dust hood and the drill pipe, the air-slot width of the sealing device, the slag discharge pressure, and the air curtain pressure were controlled at 2 mm, 0.2 mm, 0.3 MPa, and 0.5 MPa, respectively. As a result, the dust concentration was reduced from 540 mg/m³ to 15 mg/m³, with dust control efficiency reaching 97.2%. The in situ test results confirmed good dust control effects, as the dust control efficiency reached 98.3% after using the dust hood.

Research on the Physical and Chemical Characteristics of Dust in Open Pit Coal Mine Crushing Stations and Closed Dust Reduction Methods

“…Wu, D.M. [36,37] designed and applied a dust cover to achieve non-contact dust control in the borehole, resulting in a reduction in dust concentration from 540 mg/m 3 to 15 mg/m 3 and a dust control efficiency of 97.2%. Ifelola, E.O.…”

Design and Optimization of a Novel Dust Collection Device for Underground Dry Drilling Based on Numerical Simulation and Field Testing

“…Therefore, dry drilling and slag removal by wind are the main operational methods for gas pre-drainage of underground soft coal seams when drilling holes along the seam [9]. In the drilling process, a large amount of dust is ejected from the drill hole under the action of the wind jet of the drill head [10]. Then, the dust spreads to the tunnels and causes pollution, posing a severe threat to the health and safety of the workers [11,12] and possibly even triggering coal dust explosions that result in injuries and casualties [13][14][15].…”

“…Researchers have conducted numerous studies on orifice dust collection devices [18,19]. For example, to optimize the sealing performance, Wu et al [20] developed an orifice dust collection device using compressed air for non-contact sealing to achieve better dust control. For the comprehensive management of dust and gas, Fan [21] proposed an orifice dust collection device consisting of two sets of four-way connectors.…”