Siemens Power Generation combustion technology has undergonea significant transformation over the past 20 years. Evolvingfrom the 1980's diffusion flame combustor technology, whichproduces a very stable flame, but is associated with relativelyhigher levels of emissions output of some constituents, SiemensPower Generation incorporated material and technological designadvancements, industry-leading design engineers, and state ofthe art design tools to develop a successful Dry Low NOx (DLN)combustion system in the 1990's. Dry Low NOx technology providesreduced NOx emissions through a staged combustion processand unique temperature and heat release strategy. This fourstagepremixed combustion process is designed to produce reliableand stable combustion, with lower level emissions and iscurrently installed in over 100 Siemens GT's. Further improvingthe environmental compatibility of Siemens Power Generation'sfleet of gas turbines, the Dry Low Nox technology has evolvedinto a combustion system, commercially offered as “Ultra LowNox “(ULN), which is designed to achieve sub 9 ppm Nox emissions.In addition to stable combustion, the Ultra Low Nox systemis characterized by a five stage premixed combustion processthat employs a premixed pilot stage.Demonstration of Siemens Power Generation's combustion technologyis typically extensive, following a detailed design, rig andfield test, and then full scale engine testing process, which lead tocommercial introduction. The Ultra Low Nox combustion systemhas been introduced into the commercial fleet, and operating experiencewith it has included high GT efficiency and sub 9ppmNox emissions, across a wide operating range, as recently demonstratedat Idaho Power's Evander Andrews site.
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