Abstract
We investigated the impact of exhaust emissions from hydraulic support transporters on the air quality in roadways in mines. The dispersion distribution of diesel exhaust pollutants emitted by hydraulic support transporters was simulated with a dynamic mesh and computational fluid dynamics (CFD) simulations. More specifically, the dispersion and distribution of the main exhaust pollutants CO, HC, and NOx emitted by vehicles under the influence of the roadway wind flow were simulated with CFD simulations; in addition, the dispersion characteristics of exhaust pollutants from hydraulic support transporters during multiple driving phases in an alleyway (from transporting material, being unloaded at idle speed, to driving off without load) were predicted. The simulation results show that exhaust pollutants emitted by moving hydraulic support transporters can pollute the air in roadways and negatively affect the performance of gas monitoring devices in the roadway. Therefore, coal mining companies should optimize the ventilation design scheme to improve the air quality in roadways: they should increase the ventilation volume to dilute the emitted pollutants; in addition, the positions of underground gas monitoring devices should be adjusted to prevent interference from exhaust pollutants emitted by vehicles. This paper provides the theoretical basis and results of a preliminary investigation of the dispersion and transportation characteristics of exhaust pollutants emitted by vehicles in roadways. The results in this paper can serve as guidance for reducing the risk of occupational diseases.
Highlights
In operation since the twentieth century, trackless rubber-tire vehicles can be loaded and unloaded and have a high load capacity and good transportation efficiency; their use in coal mines has indirectly improved the economic efficiency of coal mines (IARC 2014)
computational fluid dynamics (CFD) simulations are used to evaluate downhole fluid dynamics and to study the dispersion characteristics of exhaust from coal mining vehicles in underground mines to identify the areas with high particulate matter concentrations and reduce the risk of occupational diseases
To analyze more thoroughly the distribution and dispersion characteristics of exhaust pollutants emitted by vehicles, a complete tunnel model, 3D vehicle models, numerical simulation methods based on the RNG k–ε turbulence model, and the gas dispersion and mixture multiphase flow models were used to simulate the coupling scenario and diffusion distribution of the emissions with respect to the tunnel airflow
Summary
In operation since the twentieth century, trackless rubber-tire vehicles can be loaded and unloaded and have a high load capacity and good transportation efficiency; their use in coal mines has indirectly improved the economic efficiency of coal mines (IARC 2014). Many computational fluid dynamics (CFD) techniques have widely been used to solve mining-related issues. At this stage, CFD simulations are used to evaluate downhole fluid dynamics and to study the dispersion characteristics of exhaust from coal mining vehicles in underground mines to identify the areas with high particulate matter concentrations and reduce the risk of occupational diseases. Silvester et al modeled the effects of flow ventilation, underground crushing installations, and dump trucks for loading
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