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Show LOW NOx NATURAL GAS BURNER DEVELOPMENT AT ABB J. A. Nicholson ABB Power Plant Laboratories Combustion Engineering Inc. Windsor, CT U.S.A. T. Marling ABB Corporate Research Center Baden, Switzerland R. D. Lewis ABB C-E Services, Inc. Windsor, CT U.S.A. ABSTRACT Environmental considerations are affecting virtually every aspect of the power industry. To help the industry meet continuously changing emissions limits, ABB has embarked on the development of low N O x burners for natural gas, wall-fired boilers, based on both internally-staged diffusion and premixed combustion systems. Data collected during the evaluation of these large laboratory-scale (70x106 Btu/hr) natural gas combustion systems have shown that the dominant variable affecting N O x emissions levels is flame temperature. ABB burners developed on the basis of either diffusion or premixed combustion have achieved N O x concentrations below 20 p p m at ABB Power Plant Laboratories in Windsor, CT. The ABB L N V ™ low N O x venturi diffusion burner offers better performance for moderately low N O x requirements. With flue gas recirculation, the A BB Environmental (EV) premixed burner achieved ultra-low N Ox emissions. INTRODUCTION The U.S. Clean Air Act Amendments of 1990 underscore the need for near-term, commercially- viable technologies and hardware that will markedly reduce combustion 2 IV-24 |