INVESTIGATION OF POLLUTION PROCESS OF THE ATMOSPHERE OF OPEN PIT SPACE FROM POINT STATIONARY SOURCES UNDER CONDITIONS OF TEMPERATURE INVERSIONS AND STILL
DOI:
https://doi.org/10.25635/2313-1586.2021.04.097Keywords:
CFD-modeling, open pit, atmosphere, aerothermodynamics, temperature inversions, pollution, ventilation, level of concern, ANSYS FluentAbstract
The aim of the work is to obtain while the process of modeling new knowledge, patterns and relationships of the distribution of harmful gas in open pit space under conditions of atmosphere temperature inversion and still, with the use of computational fluid dynamics software ANSYS Fluent. The studies were carried out on the basis of the developed 3-D CFD-models of the
open-pit mine atmosphere aerothermodynamic at Zhelezny mine of AO «Kovdorsky GOK». The geometry of the model takes into account the complex orography of the territory adjacent to the quarry from the North-West, West and South-West sides, as well as the height difference on the sides of the open pit. The incompressible fluid approximation is used to describe aerodynamic processes. The mathematical aerothermodynamics model of the open-pit atmosphere is based on the continuity equation, the Reynolds-averaged Navier-Stokes equation and the turbulent heat transfer equation. Boundary conditions of
the first and second order are implemented in the models. The direction of the wind flow is chosen from west to east. The wind speed at a height of 10 m above the pit wall is 0.1 m/s (still conditions) and 2 m/s.
Stationary sources of pollutant emissions are located on the sides of the quarry. The distribution of pollutants is considered by the example of the distribution of the gas component over carbon monoxide (CO).
The results of numerical modeling are analyzed in the form of the spatial distribution of the CO gas component over various sections and in the form of a graph of the concentration distribution depending on the height. It is shown, that with a decrease in the speed of the wind flow the time of contamination of the open pit atmosphere decreases. For speeds below 2 m/s,
when thermal forces prevail, the results of numerical modeling correlate well with empirical and calculated data obtained as a result of mathematical calculations published in other science papers on this theme. It was found that during still, when the zone of exceeding the maximum permissible concentration reaches the day surface, an arbitrary diffusion removal of pollutants from the open pit area is observed.
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