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Control of NOx Emissions from Stationary Combustion Sources
Citation:
HALL, BOB E. AND R. SRIVASTAVA. Control of NOx Emissions from Stationary Combustion Sources. In Proceedings, U.S./Sino Conference on Multipollutant Control Technology, Ya ntai, CHINA, December 01, 2008. Kyoto University, Kyoto, Japan, xxx, (2008).
Impact/Purpose:
presented paper
Description:
In general, NOx control technologies are categorized as being either primary control technologies or secondary control technologies. Primary control technologies reduce the formation of NOx in the primary combustion zone. In contrast, secondary control technologies destroy the NOx present in the flue gas from the primary combustion zone. Primary control technologies being used in the U.S. are low NOx burner (LNB) and overfire air (OFA). Data reflect that these technologies have been used on 177 boilers and have resulted in NOx reductions between 33 and 48 percent, on average, from 1990 emissions levels. The secondary NOx control technologies in use on U.S. coal-fired utility boilers include reburning, selective non-catalytic reduction (SNCR), and selective catalytic reduction (SCR). Many boilers either have used, or will use, these technologies to achieve the desired NOx reductions. The NOx reductions achieved, or projected, at these applications range from 20 to more than 80 percent. SCR has been chosen as the preferred secondary technology at numerous U.S. coal-fired utility boilers. Over 300 GW of electric generating capacity either use, or will use, SCR for NOx control in the United States.