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Dispersion Air Modeling


Dispersion air modeling provides an important tool for air quality assessments.  Air dispersion modeling provides a prediction of the air quality impact from pollutants emitted from facility operations.  The impact can vary based on stack parameters (location, height, exit temperature and exit gas velocity).  Other factors that affect the modeled impact include the facility configuration, the ground level height compared to the stack height, and the local meteorological conditions. Air dispersion modeling takes all of this into account to allow the user to predict what impact one can expect adjacent to an industrial facility.  In addition, what-if scenarios can also be modeled.  For example, what happens if we move the stack x-meters from its proposed height?  What happens if one increases production (resulting in an increase level of air-emissions)? Or how does the impact from a neighboring plant combine with your facility affect the general public. The versatility of air dispersion modeling allows industrial facilities to optimize their operations and to minimize their impact off-plant property.

Industries Using Air Dispersion Modeling

Air quality control agencies usually require that industries simulate the impact of an expansion within their plants by the use of dispersion models. Applications for major permits must contain the modeling results. Shell Engineering and Associates, Inc., has been conducting dispersion modeling studies since 1975 and provided modeling training to overseas students.   Clients include almost every type of industrial plant: power plants, steel plants, charcoal plants, automobile plants, manufacturing industries, incinerators, refractories and iron ore palletizing plants.

Why Choose Shell Engineering for Air Dispersion Modeling

The staff of Shell Engineering uses EPA guideline models, and is especially adept at developing complete permitting packages. Dispersion modeling, coupled with expertise in monitoring and dealing with governmental agencies, will provide you with the information you need for virtually any case or permitting action in which you are involved.

The permitting and dispersion modeling services typically include:

  • Determining the impact of existing and new sources and assistance in obtaining necessary permits.
  • Use of the EPA GEP guidelines to determine the best location and height for a new stack.
  • Determining possible methods of control and their effect on the potential impact.
  • Determining the impact due to fuel switching (coal/gas/fuel oil).
  • Determining the impact of changing stack height, flow rates or temperature.
  • Determining the impact of new standards such as a one hour SO2 standard.
  • Statistically correlating monitoring data to modeling data and determining trend analysis (actual data to predicted data).
  • Use of dispersion modeling to select monitoring site locations through the execution of EPA guideline models.
  • Determining possible site locations for new facilities