A NOx Plume Dispersion Model with Chemical Reaction in Polluted Environment

Recently, because of the regulatory enhancement together with the technology development, concentration of pollutants in emission sources are decreasing significantly. Nitrogen oxides concentrations in stack gases of electric power plants are around 10ppm, and for gas combined power plant it is less...

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Bibliographic Details
Published in:	JSME International Journal Series B Fluids and Thermal Engineering Vol. 49; no. 1; pp. 42 - 47
Main Authors:	KITABAYASHI, Koji, KONISHI, Shigeru, KATATANI, Atsushi
Format:	Journal Article
Language:	English
Published:	Tokyo The Japan Society of Mechanical Engineers 01-01-2006 Japan Society of Mechanical Engineers Japan Science and Technology Agency
Subjects:	Air Pollution Applied sciences Atmospheric Dispersion Atmospheric pollution Automobile Exhaust Gas Exact sciences and technology NOx Plume Model Pollutants physicochemistry study: properties, effects, reactions, transport and distribution Pollution Road Tunnel Ventilation Nitrogen oxide Plume Model Electric power plant Pollutant behavior Differential equation Automobile Exhaust Gas Gauss method Urban area Plume Road Tunnel Ventilation Modeling Road tunnel Atmospheric chemistry Algorithm performance NOx Air pollution Numerical simulation Atmospheric dispersion Combined power plant
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Summary:	Recently, because of the regulatory enhancement together with the technology development, concentration of pollutants in emission sources are decreasing significantly. Nitrogen oxides concentrations in stack gases of electric power plants are around 10ppm, and for gas combined power plant it is less than that for facilities constructed in city areas. Therefore, the concentrations at emission sources are less than one hundred times of the ambient concentrations in urban areas or for some cases almost ten times of them. The ventilation towers for automobile tunnels in urban areas are an another typical example. For such kind of low concentration sources, particularly, for nitrogen oxides dispersion, the inert gas assumption of usual plume dispersion model is not suitable, since the dispersion and chemical reactions took place together in the atmosphere. They are the major controlling factors of the diffusion in the atmosphere. We developed an Integrated Plume Dispersion Model of NOx with Chemical Reactions and examined the performance of the model. The model is based on Gaussian plume dispersion model in integrated forms, and atmospheric diffusion and chemical reactions of NO, NO2, O3, O in the plume and ambient atmosphere are described by a set of ordinary differential equations. The model was solved for different emission conditions and back ground concentrations, and reasonable results were obtained.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	1340-8054 1347-5371
DOI:	10.1299/jsmeb.49.42