The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation

Wang, Junjian; Zhao, Shuqi; Xu, Yu

doi:10.1177/1420326x211051414

Cited by 9 publications

(16 citation statements)

References 54 publications

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“…The advantages of this invention are that the installation position of the fan is fixed, the length of the pipeline is long, but there are problems such as slow smoke exhaust rate and high ventilation energy consumption. The method of pipeline ventilation is to set a ventilation hole near the front of the drilling hole that passes through the ventilation pipe, in order to discharge the unclean gas in the drilling hole into the front end of the drilling hole [6]. This method has the advantage of good smoke exhaust effect, but there is a need to move the position of the roadway and ventilation device forward, which affects engineering construction.…”

Section: Current Status Of Tunnel Construction Ventilation Technologymentioning

confidence: 99%

Ventilation Simulation and Gas Safety Risk Assessment for Non Coal on Gas Tunnel Construction

2023

jceup

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The construction of underground tunnels generally includes characteristics such as large scale, difficult conditions, long construction period, and strong concealment. Therefore, in the construction of subway tunnels, there are often safety issues that affect the quality of the entire project. In the process of underground tunnel construction, various factors that affect its safety should be carefully analyzed based on engineering practice, and scientifically and reasonably selected to ensure the safety and quality of the entire project. At the junction of tunnels and gas tunnels, it is necessary to correctly apply safety management measures for gas tunnel construction, prevent gas accidents, strengthen the effectiveness of safety management measures, and enhance ventilation stability during construction. This article aims to address the above issues and construct a gas safety risk assessment system based on the NCM (normal cloud model). The experiment has proven that the safety risk assessment and discrimination results of gas leakage in the system are III-IV, which is consistent with the reality of high oil and gas content at the construction site, susceptibility to gas overflow, and high risk of tunnel excavation.

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Section: Current Status Of Tunnel Construction Ventilation Technologymentioning

confidence: 99%

Ventilation Simulation and Gas Safety Risk Assessment for Non Coal on Gas Tunnel Construction

2023

jceup

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“…The specific location of the mine is shown in Figure 1 . A number of scholars have investigated the environmental characteristics and production situation of the Pulang copper mine, and have taken it as an example to conduct research on roadway ventilation [ 17 , 18 , 31 ]. The setting of atmospheric pressure, air density, and temperature can be directly referenced by these studies.…”

Section: Numerical Analysismentioning

confidence: 99%

“…Atmospheric pressure, air density, and air temperature were set to the same parameters as the Pulang copper mine roadway model [18]. The k-epsilon turbulence model is suitable for solving exterior flow problems involving complex geometry [26,34], and a number of scholars have experimentally verified that the realizable k-epsilon model is suitable and accurate for the study of oxygen supply ventilation systems [17]; hence, the realizable k-epsilon model is adopted in this paper. The realizable k-epsilon model considers two equation models that deal with turbulent kinetic energy, k, and its rate of dissipation, ε, which are coupled with turbulent viscosity.…”

Section: Boundary Conditions and Turbulence Modelmentioning

confidence: 99%

“…Li et al [ 15 ] designed an oxygen dispersal supply system that was a reliable approach to ensuring proper working conditions in high-altitude areas. Li et al analyzed the oxygen enrichment effect of a small-hole oxygen supply port [ 16 , 17 ] at the end of the oxygen supply duct, and developed a local oxygen supply nozzle [ 18 ] to form local oxygen enrichment at the human nose and mouth. Liu et al [ 19 ] proposed a novel point source local diffuse oxygen supply method in order to improve the oxygen environment for sleeping.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Optimization and Oxygen-Enrichment Effect of Ventilation Scheme in a Blind Heading of Plateau Mine

2022

IJERPH

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There are abundant mineral resources in plateau areas, but it is difficult to extract them safely because the problem of hypoxia in plateau mines seriously affects the life and health of workers. In order to address the problem of hypoxia in the blind heading of a plateau metal mine, a three-dimensional roadway model was established based on field data of the Pulang copper mine in Yunnan province, China. The computational fluid dynamics (CFD) method was used to explore the optimal type of oxygen supply duct outlet, and to reveal the oxygen diffusion law influencing different ventilation factors. Grey correlation analysis was used to study the correlation values of the ventilation factors on the oxygen-enrichment effect in blind headings, such as forcing duct position, exhausting duct position, and extraction pressure ratio. The results demonstrated that the oxygen-enrichment effect of a slit oxygen outlet was better than that of the traditional oxygen supply method. When the direction of the oxygen outlet hole was 30° and the height above the roadway floor was 1.95 m, the oxygen increase effect was better than other forms of oxygen supply duct outlets. Grey correlation analysis revealed that the major influencing factors of the oxygen-enrichment effect in the roadway of the plateau mine, were, in descending order, as follows: forcing duct position, extraction pressure ratio, and exhausting duct position. This study has a positive guiding significance for improving the respiration environment in blind headings of plateau mines.

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“…West et al [19] illustrated that indoor oxygenation would benefit people at high altitudes by analogy to air conditioning regulation for oxygen regulation. Li et al [20] developed a multi-component fluid model for diffusive oxygen supply in single-headed tunnels to optimize the oxygen supply method and ventilation system design, and concluded that the oxygen mass fraction distribution in single-headed tunnels showed a similar trend of increasing and then decreasing at different altitudes. Li et al [21] used computational fluid dynamics methods to explore the optimal type of oxygen supply pipe outlet based on field data from the Pulang Copper Mine in Yunnan Province, revealing the oxygen diffusion pattern affecting different ventilation factors.…”

Section: Introductionmentioning

confidence: 99%

Optimization of controlled circulating ventilation and oxygen supply scheme for high-altitude mine heading face based on CFD

Zhang¹,

Wang²,

Zhang³

et al. 2023

3rd International Conference on Applied Mathematics, Modelling, and Intelligent Computing (CAMMIC 2023)

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With the depletion of mineral resources in the plains, Chinese mining industry has shifted to higher altitudes where low pressure and low oxygen has become a bottleneck limiting further development of mining technology. The traditional diffusion type of oxygen supply has low oxygen utilization. Controlled circulation ventilation offers a good alternative for oxygen supply to workers in high altitude mines. In this study, a CFD approach was used to conduct a single factor analysis of circulating duct height, distance between circulating duct outlet and heading face, oxygen supply duct height, forcing duct air velocity and circulating duct air velocity to investigate their effects on the oxygen mass fraction located at the heading face. In addition, an orthogonal experiment was designed to analyze the effect of the above five factors on the distribution of oxygen mass fraction in the heading face. The results showed that the effect of forcing duct air velocity on the oxygen mass fraction in the heading face was the greatest. The average oxygen mass fraction in the heading face is highest when the height of circulating duct was 0.9 m, the distance between circulating duct outlet and heading face was 2 m, the height of oxygen supply duct was 1.0 m, the air velocity of forcing duct was 3 m/s and the air velocity of circulating duct was 2.5 m/s.

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The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation

Cited by 9 publications

References 54 publications

Ventilation Simulation and Gas Safety Risk Assessment for Non Coal on Gas Tunnel Construction

Ventilation Simulation and Gas Safety Risk Assessment for Non Coal on Gas Tunnel Construction

Study on the Optimization and Oxygen-Enrichment Effect of Ventilation Scheme in a Blind Heading of Plateau Mine

Optimization of controlled circulating ventilation and oxygen supply scheme for high-altitude mine heading face based on CFD

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