Abstract
To meet the 1990 Clean Air Act Amendments (CAAA), US utilities will be required to reduce nitrogen oxides (NO%) emissions. Title IV of the CAAA have established allowable emission rates for Phase I dry bottom boilers based on the equivalent NO% emitted if low NO% burners were retrofitted on boilers. This method for calculating allowable NO* emissions does not preclude the use of postcombustion NO% control technologies. In addition, Title I of the CAAA could further reduce allowable NO% emissions (necessitating the use of postcombustion NO% controls) at facilities located in designated ozone transport regions. This emphasis is important because recent EPA investigations link high ambient ozone levels with localized NO% production, as well as with hydrocarbon and. volatile organic compound (VOC) emissions.
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