Characteristics of dust distributions and dust control measures around road-header drivers in mining excavation roadways--颗粒学报PARTICUOLOGY

Hu, S., Gao, Y., Feng, G., Huang, Y., Shao, H., Liao, Q., & Hu, F. (2021). Characteristics of dust distributions and dust control measures around road-header drivers in mining excavation roadways. Particuology, 58, 268-275. https://doi.org/10.1016/j.partic.2021.03.017

Characteristics of dust distributions and dust control measures around road-header drivers in mining excavation roadways

Shengyong Hu ^a *, Yang Gao ^a, Guorui Feng ^{b c *}, Yisheng Huang ^a, He Shao ^a, Qi Liao ^a, Fei Hu ^a

a College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
b College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
c Green Mining Engineering Technology Research Center of Shanxi Province, Taiyuan 030024, China

10.1016/j.partic.2021.03.017

Volume 58, October 2021, Pages 268-275

Received 14 November 2019, Revised 11 February 2020, Accepted 26 March 2021, Available online 24 April 2021, Version of Record 17 May 2021.

E-mail: hsyztx@163.com; fgrhsy@163.com

Highlights

• Dust dispersion characteristics during CRP and SRP were simulated respectively.

• Dust distributions and migration actions around road-header drivers have been analyzed.

• Dust separation and extraction systems used for driver protection was developed.

• Effect of dust removal before and after application of the systems was analyzed.

Abstract

In the present study, a numerical simulation method was adopted in order to examine the characteristics of dust dispersion during continuous dust release periods (CRP) and stop dust release periods (SRP). The purpose was to analyze the dust distributions and migration actions around road-header drivers in excavation roadways, and then determine effective dust control measures for underground coal mines. This study’s simulation results showed that the dust concentrations continuously increased, and then gradually reached a stability level during the CRP. During that time, the locations of the drivers were always at the intersection of the original migration dust and the backflow dust, and the drivers were invaded by these two strands dust. However, during the SRP, the dust concentrations gradually decreased under the actions of the roadway ventilation. Besides, obvious backflow phenomena were observed around the road-header during the SRP. The locations of the drivers were still within the backflow paths of the high dust concentrations. At the present time, dust separation and extraction systems have been implemented in coal mines, including vacuuming and air knife devices, which are designed to control the dust around the road-header drivers. The field applications of these systems were conducted in the 26 mechanized excavation faces of the Zhangcun Coal Mine. The results revealed that the use of these dust removal systems could effectively reduce the dust concentrations around the road-header drivers. In the present study, the dust removal rates during the CRP and SRP were determined to reach up to 88.7% and 94.6%, respectively. Therefore, the results of this research study provided effective theoretical guidance of the characteristics of dust distributions in coal mines, and introduced effective control methods for the hazardous dust concentrations around road-header drivers during the excavation process.

Graphical abstract

Keywords

Excavation roadway; Road-header driver; Dust distribution; Dust control; Numerical simulation

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