engleski

MODELING OF DISPERSION AND DIFFUSION OF POLLUTANTS FROM INDUSTRIAL CHIMNEY STACKS IN RIJEKA REFINERY

Numerical simulation of dispersion of pollutants from two chimneystacks situated in Rijeka’ s refinery were defined. Detection of ground-level concentrations of hazardous effluents (p.e. SO2, CO2) on a complex terrain around Bakar’ s bay (vicinity of Rijeka) was performed. Importance of conveying such a simulation is to ensure that pollutants are well dispersed and significant consequences on surrounding populated area detected. IDEAS CAD software was used to make geometry based on terrain topology and to generate mesh needed for FLUENT a fluid analysis software. Geometry was made as ‘ box model’ (in atmospheric modelling one of the most used one) which bottom side was replaced with terrain topology. Unstructured tetrahedral mesh that consists of 250000 elements was generated. Five different south wind profiles (directed NW, N, NE, E and SE) with reference values of 2.5, 5 and 10 ms-1 were used as air velocity inlets. Combustion products from chimneys were set as effluent velocity inlets. Results that are depicted from set boundary conditions give an insight to behaviour of pollutants in a crossflow. 3D simulation gave results with no simplifications and approximations that usually exist in 1D and 2D environmental models and that are readily used for fast analysis. It opened a window to amazing set of 3D effects that exist in nature.

Atmospheric modelling; air pollution; ground concentrations; plume rise

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