`Sensitivity of Condensable Particulate Matter Speciation on Predicted Visibility Impacts – Case Study,` presented at the NCASI West Coast Conference, September 2005

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Courtesy of Trinity Consultants

Introduction
This paper evaluates a realistic case study for an existing major emission source that is required to evaluate visibility impacts at a nearby federally-protected Class I area. The fictitious source is a 1960's era coal-fired electric generating unit (EGU) characterized as a pulverized coal-fired, dry bottom, wall-fired boiler equipped with PM and NOx controls (i.e., electrostatic precipitator and low-NOx burners). Assuming the boiler is rated at S30 MMBtu/hr and combusts pulverized coal at 2.6% sulfur and 13% ash, the annual emissions of visibility affecting pollutants (VAPs) are calculated using U.S. EPA AP-42 methodologies as 17,916 tons per year (tpy) of SO2; 1,995 tpy of NOx; and 963 tpy of total PM10-

Two fictitious 'projects' are considered for this presentation:

BART Applicability
The EGU has been identified as a BART-eligible source and the State Agency has requested the owner perform a BART applicability analysis consistent with the VISTAS approved protocol to evaluate the source's impact on regional haze.

PSD Project
The owner wishes to make a major modification to the EGU, which triggers PSD review of NOx, S02, and PM10-  Besides the Class II Air Quality Analysis, the applicant needs to evaluate the secondary impacts, one of which is visibility degradation at affected Class I areas. Although unrealistic, this paper assumes the installation has emissions identical to the existing boiler.

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