Baltimore Gas & Electric expects to see a 65% reduction innitrogen oxide (NOx) emissions this summer as a result of a new gasreburn system installed on two of its coal-fired electricgeneration boilers and the Gas Research Institute is taking credit.

With the new system about 20% of the heat input for the two 200MW boilers will come from natural gas. That translates to between14,000 and 15,000 Dth/d (about 15 MMcf/d) of natural gas accordingto John Hattrup, environmental director for BG&E’s fossilenergy division. The process being used by BG&E is not the onlyanswer.

“We now have a portfolio of gas reburn technologies to provideutilities with a range of economical choices for complying withregulations that require different NOx reductions for more than1,000 existing coal-fired boilers,” said John Pratapas, GRIprincipal product manager. “The three versions of reburn coming online this ozone season can provide a 30% to 65 % NOx reduction atcosts of about $700 to $2,000 per ton of NOx removed.”

Besides BG&E, Duquesne Light in Pittsburgh, Public ServiceElectric & Gas (PSE&G) in Newark, NJ, and Conectiv inWilmington, DE, all are firing up newly installed reburn systems.

PSE&G is using a new reburn technology on two 325 MWcoal-fired boilers, firing the units with between 8% and 12%natural gas.

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