Over the past 10 to 15 years, emissions regulations
have had a great impact on design of gas turbine HRSGs. In
addition to recovering energy from turbine exhaust gases,
today's HRSG designs must also accommodate NOx and
CO reduction devices to meet stringent emissions
regulations.
NOx and CO have been regulated to single
digits, less than 2.5 parts per million volume dry (ppmvd) in
some locations. Catalysts are widely used in HRSGs to limit
these emissions. Advanced low-NOx combustors and
methods such as water or steam injection in the combustor are
also used to minimize NOx emissions. All these
measures impact th
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