Numerical study on fine dust pollution characteristics under various ventilation time in metro tunnel after blasting

Xie, Zhuwei; Xiao, Yimin; Jiang, Congxin; Ren, Zhili; Li, Xueqin; Yu, Kecheng

doi:10.1016/j.buildenv.2021.108111

Cited by 32 publications

(8 citation statements)

References 55 publications

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“…Because of the small volume fraction of tail gas particles in the whole flow field, tail gas particles are treated as discrete medium in the fluid, and the discrete phase model is used to describe the trajectory of tail gas particles 34 – 36 . The specific mathematical equation is as follows: …”

Section: Mathematical Model Constructionmentioning

confidence: 99%

Influence of mixed ventilation on particulate-gas diffusion and distribution of diesel engine exhaust in fully mechanized excavation face

Zhou

Yang

Duan

et al. 2023

Sci Rep

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Tail gas emitted by underground trackless rubber wheel cars poses a serious threat to the health and safety of underground workers. To effectively reduce the tail gas concentration of a comprehensive excavation face, this study adopted a numerical simulation method to investigate the influence of air suction volume Q and distance L between trackless rubber wheel cars and headfaces on the diffusion law of diesel particulate matter, CO, and NOx under long suction and short pressure ventilation. The results showed that under the condition of L = 20 m, the trackless rubber wheel car is closer to the suction air duct. At this point, when Q = 600 m3/min, the tail gas control effect in the roadway is optimum. In addition, under the condition of L = 40 m, the trackless rubber wheel car is in the middle of the roadway. At this point, when Q = 300 m3/min, the tail gas control effect in the roadway is optimum. When L = 60 m and Q = 200 m3/min, the ventilation mode in the roadway is mainly pressure-in ventilation. The high-volume-fraction NOx region and the medium-volume-fraction NOx region under this air volume are small.

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Section: Mathematical Model Constructionmentioning

confidence: 99%

Influence of mixed ventilation on particulate-gas diffusion and distribution of diesel engine exhaust in fully mechanized excavation face

Zhou

Yang

Duan

et al. 2023

Sci Rep

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“…Furthermore, Hu et al used Monte Carlo and airflow–dust unidirectional coupling methods to study the dust transport in blasting excavation tunnels and revealed the temporal distribution characteristics of total and respiratory dust particles . For the blasting area of subway tunnels, Xie et al analyzed the effects of the volume flow rate of forced air ducts and total mass of explosives on ventilation and dust removal time based on different upper limits of dust concentration …”

Section: Introductionmentioning

confidence: 99%

“…24 For the blasting area of subway tunnels, Xie et al analyzed the effects of the volume flow rate of forced air ducts and total mass of explosives on ventilation and dust removal time based on different upper limits of dust concentration. 25 As mentioned above, the vast majority of numerical studies on dust diffusion are focused on coal mine fully mechanized mining faces, whose calculation domain is mostly rectangular or Ushaped, which is different from underground metal mining stopes. 26 Second, metal mines are mainly excavated by blasting, where the blasting face instantly releases a large number of dust particles with rich sizes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gas–Solid Flow Characteristics of Airflow and Dust Particles in Blasting Excavation of Underground Metal Mine Tunnels

Pang,

Ren,

Wang

et al. 2024

ACS Omega

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Effective dust removal has long been a challenge in the blasting mining of underground metal mine tunnels, and uncontrolled dust diffusion seriously endangers workers' respiratory systems and the underground space safety environment. However, the vast majority of existing numerical studies on dust diffusion are focused on coal mine fully mechanized mining, which is different from metal mine blasting excavation in terms of stope structure and dust properties. Furthermore, the mechanism by which the forced and exhaust ventilation modes affect the diffusion characteristics of inhalable particles is unclear. In this work, gas−solid flow characteristics for dust diffusion in a typical metal mine blasting tunnel were numerically investigated based on the Euler−Lagrange method, where the blasting face instantly released 6.37 × 10 7 particles with 100 different sizes, ranging from 0.8 to 200 μm. The interphase forces between airflow and dust particles are comprehensively modeled, and the particle diffusion effect caused by fluid turbulence is described by a discrete random walk model. Detailed information for airflow turbulence and particle migration was revealed, and dust removal efficiencies for inhalable particulate matter (PM10) by forced, exhaust, and hybrid ventilation were analyzed. Numerical results predict a complex airflow pattern in the working roadway, including the jet-flow region, return airflow core region, airflow disorder region, and secondary flow region. Dust diffusion temporal characteristics can be divided into three stages, namely, the initial stage of dust generation, the efficient ventilation and dust removal stage, and the later stage of dust diffusion. Dust diffusion spatial characteristics indicate that under the Coanda wall attachment effect, the dust concentration exhibits nonuniform distribution in both vertical and horizontal directions of the return air roadway. The dust removal efficiency of hybrid ventilation on inhalable particles above respiratory height is better than that of forced ventilation, especially in the return air roadway. The additional exhaust air duct based on forced ventilation can discharge more inhalable particles from the tunnel.

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“…In the process of exploitation in open-pit limestone mines, a large amount of dust is emitted in the blasting operation [1]. The blasting dust not only increase the prevalence of pneumoconiosis among miners but also pollute atmospheric environment [2]. The gases produced by explosive explosion include CO 2 , CO, N 2 , and NO X [3].…”

Section: Introductionmentioning

confidence: 99%

Study on the Factors Influencing on Wetting Performance of Blasting Dust in a Limestone Mine

Nie

Yuan

Li³

et al. 2022

Geofluids

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In order to find out the factors influencing on wetting performance of blasting dust in open-pit limestone mines, the blasting dusts in a limestone mine in Tongling, Anhui Province, were studied. The samples of hydrophobic dust (MD) and hydrophilic dust (ND) were obtained by hydrostatic separation experiment. The contact angle of water on dust samples, particle size distribution, surface oxygen-containing functional groups, surface mineral composition and content, and surface pore structure was determined. The measurement results of contact angle indicate that the wetting performance of MD is weaker than that of ND. By comparative analyzing, the surface characteristics of MD and ND factors influencing on the wetting performance of the dusts were determined. The results showed that MD has a smaller particle size, higher volume fraction of hydrophobic groups, and more complex surface morphology than that of ND, which leads to its weaker wetting performance than that of ND.

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Numerical study on fine dust pollution characteristics under various ventilation time in metro tunnel after blasting

Cited by 32 publications

References 55 publications

Influence of mixed ventilation on particulate-gas diffusion and distribution of diesel engine exhaust in fully mechanized excavation face

Influence of mixed ventilation on particulate-gas diffusion and distribution of diesel engine exhaust in fully mechanized excavation face

Gas–Solid Flow Characteristics of Airflow and Dust Particles in Blasting Excavation of Underground Metal Mine Tunnels

Study on the Factors Influencing on Wetting Performance of Blasting Dust in a Limestone Mine

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