CFD Simulation Based Ventilation and Dust Reduction Strategy for Large Scale Enclosed Spaces in Open Pit Coal Mines—A Case of Coal Shed

Abstract

The coal shed is an enclosed space where raw coal is stored and handled. The intensive operation of the machinery inside the coal shed generates a large amount of dust, and the wind speed inside the enclosed space easily leads to a high concentration of dust, which endangers the physical and mental health of the workers. In this paper, we first studied the particle size distribution of dust samples in the coal shed and found that 12.2% of the dust in the air of the coal shed was 10–100 μm, 87.8% was less than 10 μm, and 72.9% was less than 2.5 μm. Fluent was used to simulate the law of dust dispersion in the coal shed under different working conditions, and finally, the simulation results were used to guide the design of the ventilation site and dust-reduction scenario. The experimental and simulation results show that under the same working conditions, the average dust reduction efficiency of the ventilation method in which the north side and south side pump air outside was 9.9%. The ventilation method in which the north side blows inside and the south side pumps outside was 23.7%. The average dust reduction efficiency of the ventilation method in which the north side blows inside and the south side pumps outside + placing the fan in the middle was 59.9%. The research results can provide some reference value for indoor air quality improvement.

Numerical modeling of the wind regime on the beaches of the wash of the artificial storage facilities for mineral processing waste

“…Using these assumptions and formulas (1)-( 4), CFD model was developed to analyze the wind regime formed by the flow around the MPW. The model is based on the numerical integration of the 2D equation for the velocity potential by the Liebman method [2][3][4].…”

“…Mining companies play an important role in the country's export potential, as well as in the sustainable development of the regions where they are located [1][2][3][4][5]. However, each such enterprise is accompanied by waste storage facilities for mineral processing waste, which are mostly artificial formations on the earth's surface.…”

“…Taking into account the complex geometry of the outer surface of the MPW embankment dam, formed by the sequential repetition of the slope and the dam shelf when moving to a new embankment tier (figure 1), powerful aerodynamic models -CFD modelsshould be used to theoretically solve the problem of determining the wind speed along the beach. This approach has been successfully used by domestic and foreign experts in modeling the wind regime [1,2]. However, well-known models of this class, such as ANSYS CFX, require a very significant amount of time to calculate the airflow velocity field when flowing around structures with such a complex geometric shape as the MPW.…”

Investigation of Steep Waste Dump Slope Stability of Iron Ore Mine—A Case Study

“…It cannot be solely based on mathematical and mechanical methods for computational representation and evaluation. Instead, it must consider the geological conditions of slopes and rely on sound judgment [18][19][20], and the characteristics of the rock mass itself, are the key to improving the stability of slopes. Chen [21] collected soil samples from the discharge field and performed direct shear tests to obtain the shear strength parameters of the soil body, which provided a theoretical basis for the structural design of the discharge field.…”

Exploring Land-Cover Types and Their Changes in the Open-Pit Mining Area of Ordos City Using Sentinel-2 Imagery

“…Some of these large-scale coal mines, including open-pit and underground mines, are being extensively and intensively mined, leading to a variety of environmental problems [18,19]. With the increased emphasis on environmental protection, Ordos City is also actively promoting the greening and sustainability of coal production [19][20][21]. Therefore, it is of great significance to explore the land-cover types and their changes in the open-pit mining area in Ordos City in order to promote the environmental restoration of mines and the construction of green mining areas.…”