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AWMA Presentation Application of Two State-of-the-art Dispersion Models
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AWMA Presentation Application of Two State-of-the-art Dispersion Models

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AWMA Presentation : Application of Two State-of-the-art Dispersion Models

AWMA Presentation : Application of Two State-of-the-art Dispersion Models


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  • WELCOME TO NANTICOKE
  • Transcript

    • 1. Paul Complin 1 , Robert Lyng 2 , Hong Liu 3 , Alan Cocks 4 1ORTECH Environmental, [email_address] 2 Ontario Power Generation Inc., rob.lyng@opg.com 3 PhD Candidate, York University, [email_address] 4 EnviroAnalytics, alan.cocks@enviroanalytics.com Application of Two State-of-the-art Dispersion Models
    • 2.
      • Ontario Regulation 419/05 under the Ontario Environmental Protection Act introduced new air requirements including updated air dispersion models.
      New Ontario Air Regulatory Regime
    • 3.
      • All Ambient Air Criteria Met for current Regime
      • But Preliminary Screening Indicated Potential for Hundreds of Hours of Exceedances
      • SO 2 selected as the basis for assessing compliance risk.
      Compliance Issue
    • 4.
      • Develop a Risk Based Operational Regime that meets the new Requirements
        • Operational Restrictions
        • Fuel Switching
        • Capital Upgrades (e.g. FGD)
      Overall Project
    • 5.
      • SO 2 selected as the basis for assessing compliance risk.
      • AERMOD and ADMS selected as the Assessment Models
      Modelling Project
    • 6.
        • Eight Coal Fired Power Generation Units
        • Range of coal types and blends
        • Two 200 metre stacks with four flues each
        • CEMs measure SO2 emission rates, exhaust velocities, exhaust temperatures
        • Lakeshore site, flat terrain
      Nanticoke Generating Station
    • 7. Lake Erie Lake Ontario Nanticoke GS Buffalo Toronto Detroit
    • 8.
    • 9.
      • Regulation 419/05 and the Air Dispersion Modelling Guideline for Ontario
      • Issued in 2005, updated March 2009
      • Screen3/AERMOD as the primary model
      • Regional 5 year Meteorological Data Sets
      • Highest 8 hours Excluded as Outliers
      • Alternate Models ‘If Conditions Warrant’
      Modelling Protocol
    • 10. AERMOD Performance
    • 11. Modelling Methodology
    • 12. Two Models: AERMOD & ADMS AERMOD ADMS Both “New Generation” models Components are based on similar sets of state-of-the-art algorithms to describe the state of atmospheric boundary layer Bimodal distribution of turbulent vertical velocities for convective conditions. Regulatory model in US & Ontario and Alternative model elsewhere. Regulatory model in UK and Alternative model in US. Allows vertical profiles of wind and temperature to be input. Requires only one level of near-ground observations to be input, but could take the state of the art ABL as input. Contains shoreline module.
    • 13. Dispersion Factors for Five Scenarios (all units at MCR)
    • 14. Key Model Parameters Monin-Obukhov Length Boundary Layer Depth y
    • 15. Wind Speed versus Dispersion Factor
    • 16. 1/L mo versus Dispersion Factor
    • 17. Model Parameters for 1000 highest Maximum Dispersion Factors Monin-Obukhov Length Boundary Layer Depth
    • 18. Dispersion Factors for Five Scenarios (all units at MCR)
    • 19. Conclusions
      • Two state-of-the-art models were applied in compliance mode to assess their differences. 
      • The models' different treatment of key model parameters results in significantly different outputs. 
      • The identification of the compliance parameters, and therefore the cost of compliance, can be strongly influenced by model selection. 
      • ADMS offers a shoreline module whereas AERMOD currently does not. This difference may be important for facilities near large bodies of water.
    • 20. Paul G. Complin Principal- Compliance and Permitting ORTECH Environmental 804 Southdown Road Mississauga, ON, Canada L5J 2Y4 Phone 905 822-4120 e266 or 877-774-6560 e266 Fax 905 855-0406 [email_address] www.ortech.ca Questions?