Abstract
The high-temperature environment is a major factor that affects deep mining. Cooling has become a major expense, accounting for up to 25% of the total energy consumption of such mines. To address methods of cooling and the cooling cost, this paper studies the influence of the ventilation duct layout on the cooling effect. Six models were created in ICEM-CFD (3D modeling software), and the influence of cold airflow diffusion on the temperature of the mine environment was numerically simulated using ANSYS Fluent. Under the condition of the same ventilation volume, two models utilizing single pipe and double pipe scenarios were established, and six points were selected as the pipeline suspension position, forming six ventilation duct models. The cooling effect of each model was evaluated by analyzing the average temperature of the roadway section, the three-dimensional distribution of the roadway temperature and the velocity streamline of the whole roadway. The results show that the double-tube model has greater advantages than the single-tube model does, due to its superior local temperature, average temperature of the cross-section, range below 303 K, temperature uniformity and local wind speed. Among the models, model 4 (diameter of 0.5 m, 1.9 m away from the bottom of the roadway and 2.4 m away from the center of the circle) is the best pipeline layout scheme for comprehensive temperature values, roadway temperature uniformity and other factors. The average temperature is 299.3 K within 8 m from the mining face, which is 1.66 K lower than that of the single tube model. This configuration will increase the comfort of the mining environment and reduce cooling costs. These results can provide a reference for ventilation duct layouts of roadways in high temperature mines.
Highlights
Sustainable development is a lifelong challenge around the world
In the two-tube model, the pipe diameter was reduced while reducing the wind speed in order to maintain the same amount of cold air flow as in the single pipe model
This paper investigated six roadway ventilation duct models and analyzed the cooling effects of each model, combined with numerical simulations, with a purpose of achieving a more comfortable
Summary
Sustainable development is a lifelong challenge around the world. Considering relevant environmental factors, economic development, and sustainable development, energy demand should be controlled. As mining depths have increased, (the current depth is over 3 km [6], which is called ultradeep mining), increases in VRT and air self-compression heat have made the mining environment very unfavorable, which has led to a significant increase in mining cost (in deep mines, the cost of air conditioning cooling systems accounts for approximately 1/4 of the total energy consumption of the mine [7,8]). Air ventilation is insufficient to remove the heat generated by the deep surrounding rock, mining equipment and blasting (the outdoor temperature in summer in southern China can exceed 308 K). Sasmito et al [6] created a three-dimensional model for underground mine thermal management These studies lack a systematic, integral analysis of the design of air conditioning ventilation ducts for high temperature mines. Under the premise of the same ventilation conditions, the quality of each model was evaluated by analyzing the tunnel temperature and distribution
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