RESULTS “We saw significant NOx reduction with a relatively small capital investment. We recouped our investment after two months of operation.” Steve Stultz Constellation Energy Technical Engineer APPLICATION Unit 1 is a 200 MW B&W sub-critical once-through cyclone boiler. Unit 2 is a 205 MW B&W drum cyclone boiler. CUSTOMER Constellation Energy, Crane Units 1 & 2 located in Baltimore, Maryland. CHALLENGE Ozone season in Baltimore, Maryland, which is from May through September, presented a challenge for Constellation’s Crane power units. High NOx emissions and escalating NOx credits threatened the future of the units from the late 1990s through 2004. In late 1999 through early 2000, Constellation installed over-fire air/gas reburn systems in an effort to reduce Crane NOx emissi

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