Optimization of spraying dust reduction technology of continuous miner machine and the dust environment in a tunnel, based on computational fluid dynamics (CFD) technology

We aimed to solve the problem of excessive dust concentration during the tunneling process of continuous mining. According to the analysis, the optimal nozzle was an X-type 2.0-mm nozzle, and the optimal layout was eight nozzles on the upper side of the cutting arm of a continuous miner machine, alo...

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Bibliographic Details
Published in:Powder technology 2022-01, Vol.398, p.117044, Article 117044
Main Authors: Nie, Wen, Guo, Cheng, Zhang, Shaobo, Peng, Huitian, Xu, Changwei, Ma, Qingxin, Yuan, Mingyue, Zhou, Weiwei, Guo, Lidian, Cheng, Lei
Format: Article
Language:English
Subjects:
Air pollution
Clean environment
Coal mines
Coal mining
Computational fluid dynamics
Computer applications
Continuous miner machine
Dust
Dust control
Flow rates
Flow velocity
Fluid dynamics
Hydrodynamics
Machine tools
Miners
Mining
Nozzles
Numerical simulation
Optimization
Polluted environment
Reduction
Spraying
Spraying dust reduction
Technology
Tunnels
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Summary:We aimed to solve the problem of excessive dust concentration during the tunneling process of continuous mining. According to the analysis, the optimal nozzle was an X-type 2.0-mm nozzle, and the optimal layout was eight nozzles on the upper side of the cutting arm of a continuous miner machine, along with three nozzles on the left side, three nozzles on the right side, and four nozzles on the lower side. The spraying pressure was 6 MPa, and the spray flow rate was 2.484 L/s. The field application was carried out in the continuous mining tunnel of Jinjitan Coal Mine, China. During the field application, the total dust concentration was reduced to 16.9 mg/m3, the respirable dust concentration was reduced to 5.3 mg/m3, and the dust reduction rate was more than 89.2%. As a result, the problem of dust pollution in the continuous mining tunnel was effectively solved. [Display omitted] •Analyze the main characteristics of the nozzle through the spray experiment.•Numerical simulation of spray dust suppression device of continuous miner.•The optimum nozzle layout of continuous mining machine is obtained.•According to the characteristics of the fog field, the best spray pressure is 6 MPa.•Field measurement shows that the optimized dust removal rate is as high as 89%.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2021.117044