8090

Source: EPA/State and Territorial Air Pollution Program Administrators and the Association of Local Air Pollution Control Officials

Source: EPA/State and Territorial Air Pollution Program Administrators and the Association of Local Air Pollution Control Officials

Table 17-11 Potential Emissions Reductions from Gas Turbines Control Technology % Emissions Reduction

Water/Steam Injection 70-90

DLN Combustors 60-90

SCR 90

Source: EPA/State and Territorial Air Pollution Program Administrators and the Association of Local Air Pollution Control Officials exhaust temperature, air-to-fuel ratio set point, and catalyst volume.

There are several commercially available selective non-catalytic reduction (SNCR) (also called thermal NOX reduction) systems that selectively reduce NOX without catalysts. In some systems, gaseous ammonia (NH3) is injected into flue gas to reduce NOx to N2. The chemical reaction mechanism is similar to that of SCR NOX abatement systems using ammonia or urea. However, since no catalyst is present, reactions occur at a much higher temperature of about 1,300 to 1,400°F (700 to 760°C) and consumption of ammonia/urea is significantly higher than with SCR systems. The narrow temperature window for controlling reactions presents difficulties, particularly when loads vary. Additives have been developed to expand this temperature window.

Summary of NOx Emissions Control Technologies

Tables 17-9, 17-10, and 17-11, based on EPA data, indicate the applicability and effectiveness of various options for controlling NOX emissions from commercial and industrial (C&I) boilers, reciprocating engines, and gas turbines, respectively.

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