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CONTROL OF NOX EMISSIONS FROM U.S. COAL-FIRED ELECTRIC UTILITY BOILERS
Srivastava*, R K. AND R E. Hall*. CONTROL OF NOX EMISSIONS FROM U.S. COAL-FIRED ELECTRIC UTILITY BOILERS. PERSPECTIVES IN ENERGY. Moscow International Energy Club, 6:157-175, (2002).
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The paper discusses the control of nitrogen oxide (NOx) emissions from U.S. coal-fired electric utility boilers. (NOTE: In general, NOx control technologies are categorized as being either primary or secondary control technologies. Primary technologies reduce the amount of NOx produced in the primary combustion zone. Secondary technologies reduce the NOx present in the flue gas from the primary combustion zone). Primary technologies in use in the U.S. are low NOx burner (LNB) and overfire air (OFA). They utilize staged combustion to reduce NOx formation in the primary combustion zone. Data reflect that primary technologies, applied on 177 boilers, have resulted in reductions of 33-48%, on average, from 1990 emissions levels. In particular, applications of LNB resulted in reductions of >40%, on average, from 1990 levelas. Secondary technologies used on U.S. coal-fired utility boilers include reburning, selective noncatalytic reduction (SNCR), and selective catalytic reduction (SCR). Of these boilers, 14 have used, or will use, reburning as their NOx control technology. The NOx reductions achieved, or expected to be achieved, at these boilers range from 39 to 67%. Of the U.S. coal-fired utility boilers, 22 have used, or will use, SNCR. NOx reductions ahieved, or projected, at these boilers range from 20 to 62%. Data indicate that 79 boilers will use SCR.