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Maryland Utility NOx RACT Update Report



This report provides a discussion of the measures utilities have implemented at power plants in Maryland to meet nitrogen oxide (NOx) Reasonably Available Control Technology (RACT) requirements. Low NOx burners and overfire air were the technologies chosen for emissions reductions to meet RACT emission limits. A review of the effectiveness of the installed technologies since installation is provided in comparison with emission reductions from similar units operating in surrounding states. The impact of regulations recently promulgated or in development that will require additional NOx emission reductions are discussed.

With the exception of the Potomac Electric Power Company’s Chalk Point Unit 4, which was already equipped with low NOx burners, no utility boiler in Maryland was able to comply with the presumptive NOx RACT limits of COMAR 26.11.09. As a result, alternative emission limits were proposed by utility sources to comply with RACT. Low NOx burners were proposed by utility sources, where economically feasible, to comply with the alternative limits. A total of nine of the 19 operating units in Maryland currently utilize low NOx burners; the remainder have no add-on control or burner modifications to reduce NOx emissions. It is noted that similar units (boiler type, size, and fuel combusted) operating in surrounding states with low NOx burners have reported NOx emissions and emissions reductions similar to those experienced by Maryland units. Additional NOx emissions reductions will be required to meet NOx emissions limits for utility units mandated by other air regulations. A summary of the required restrictions for Maryland utility units is provided in this report.

Above is the abstract. The entire report (1 Mb) is available on-line in pdf format (you will need the Adobe Acrobat reader to view it.)

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This page was updated on May 4, 2001.