Prediction of the air pollution in workplaces near railways

Authors

  • M. M. Biliaiev Dr. Sc. (Tech.), Prof., Ukraine
  • Mutiu Olatoye Oladipo postgraduate, Ukraine
  • O. V. Gyrkalo stud., Ukraine

Keywords:

air pollution, railway transport, transportation of coal, numerical modeling, removal of coal dust from the wagon

Abstract

Abstract.  Purpose. Development of a CFD model for estimating the level of air pollution in the working areas near the railroad during coal transportation. Methodology. To solve the problem, a CFD model based on the application of the equations of motion of inviscid incompressible fluid and mass transfer has been developed to determine the velocity field of the wind flow near the wagon and in the working area near the railway line. For numerical integration of the coal dust transfer equation, an implicit alternating-triangular difference scheme was used. When constructing a difference scheme, the transport equation is split, which makes it possible to construct an effective algorithm for solving a differential problem. The unknown value of the concentration of coal dust at each step of the splitting is determined by the explicit scheme – the running counting method, which ensures a simple numerical realization of the splitting equations. For the numerical integration of the equation for the velocity potential, the Richardson method is applied. The developed numerical models form the basis of the created package of applied programs. Based on the constructed numerical models, a 3D computational experiment was performed to estimate the level of atmospheric pollution during the removal of coal dust from a wagon. Findings. A 3D numerical model has been developed that belongs to the class of "diagnostic models". This model takes into account the main physical factors that affect the process of dispersal of coal dust in the work area near the railway line during the transportation of coal. The proposed model requires a small amount of computer time in practical implementation on small and medium power computers. This model can be used to perform calculations to assess the influence of various factors on the level of contamination of working areas near the railroad. Calculations have been performed to determine the concentration of coal dust in the working area near the railway car. The results of a laboratory experiment on the study of the formation of contamination zones near the car model are presented. Originality. A CFD model has been created that allows to take into account the significant factors that influence the process of coal dust dispersion in working areas near the railway main  Practical value. An effective CFD model for the express calculation of the level of air pollution in working areas near the railway line for the transportation of coal is considered. The model can be applied to the development of measures to protect workers of the mainland from dust pollution. The proposed model allows to calculate the 3D aerodynamics of the air flow and the process of scattering of coal dust on the mainland territory.

Author Biographies

M. M. Biliaiev, Dr. Sc. (Tech.), Prof.

Department of «Hydraulics and Water Supply», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, 2, Lazaryan St., Dnipropetrovsk, 49010, Ukraine, tel. +38(056) 373-15-09

Mutiu Olatoye Oladipo, postgraduate

Department of «Hydraulics and Water Supply», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, 2, Lazaryan St., Dnipropetrovsk, 49010, Ukraine, tel. +38(056) 373-15-09

O. V. Gyrkalo, stud.

Department of «Hydraulics and Water Supply», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, 2, Lazaryan St., Dnipropetrovsk, 49010, Ukraine, tel. +38(056) 373-15-09

References

Belyaev N.N., Berlov A.V., Mashikhina P.B. Modelirovanie nestacionarnyh processov avarijnogo zagryazneniya atmosfery [Simulation of non-stationary processes of emergency air pollution]. Dnepropetrovsk, Aktsent PP Publ., 2014, 127 p.

Belyaev N.N., Gunko Ye.Yu., Mashikhina P.B. Matematicheskoye modelirovaniye v zadachakh ekologicheskoy bezopasnosti i monitoringa chrezvychaynykh situatsiy [Mathematical modeling in problems of environmental safety and monitoring emergencies]. Dnepropetrovsk, Aktsent PP Publ., 2013, 159 p.

Belyayev N.N., Karpo A.A. Zashhita okruzhayushhej sredy pri transportirovke uglya [Protecting the environment from coal transportation]. Zbirnyk naukovykh prats NHU [Proc. of NMU]. Dnipropetrovsk, Natsionalnyi hirnychyi universytet Publ., 2015, № 48, pp. 223 – 228.

Belyayev N.N., Karpo A.A. Modelirovanie processa snosa ugolnogo koncentrata iz poluvagonov [Simulation of the process of coal concentrate out from halfwagons]. Zbirnyk naukovykh prats «Naukovyi visnyk budivnytstva» [Proc. «Scientific Bulletin of construction»], Kharkiv, 2016, issue 1 (83), pp. 196 – 199.

Berlyand M.Ye. Prognoz i regulirovaniye zagryazneniya atmosfery [Prediction and regulation of air pollution]. Leningrad, Gidrometeoizdat Publ., 1985. 273 p.

Bruyatskiy Ye.V. Teoriya atmosfernoy diffuzii radioaktivnykh vybrosov [The theory of atmospheric diffusion of radioactive emissions]. Kiev, Institut gidromekhaniki NAN Ukrainy Publ., 2000. 443 p.

Gusev N.G., Belyaev V.A. Radioaktivnye vybrosy v biosfere [Radioactive emissions in the biosphere]. Moscow, Energoatomizdat Publ., 1991. 257 p.

Marchuk G.I. Matematicheskoye modelirovaniye v probleme okruzhayushchey sredy [Mathematical modeling in the environmental problem]. Moscow, Nauka Publ., 1982. 320 p.

Samarskiy A.A. Teoriya raznostnykh skhem [The theory of difference schemes]. Moscow, Nauka Publ., 1983. 616 p.

Uork, K., Uorner S. Zagryazneniye vozdukha. Istochniki i kontrol [Air pollution. Sources and control]. Moscow, Mir Publ., 1980. 539 p.

Biliaiev, M. Numerical Simulation of Indoor Air Pollution and Atmosphere Pollution for Regions Having Complex Topography / M. Biliaiev // NATO Science for Peace and Security Series C: Environmental Security. – 2012. – P. 87–91. doi: 10.1007/978-94-007-1359-8_15.

Biliaiev M. The Numeric Forecast of Air Pollution Caused by a Blasting Accident in the Enterprise Responsible for Rocket Fuel Utilization in Ukraine / M. Biliaiev, M. Kharitonov // Disposal of Dangerous Chemicals in Urban Areas and Mega Cities. Proceedings of the NATO Advanced Research Workshop. – Springer, 2013. – P. 313–327.

Published

2017-04-27

Issue

Section

Energy, ecology, computer technology in construction