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3.5 GE Low Emissions Combustor Evolution Figure 3 shows the evolution of low emissions combustors at GE. Most current fielded products use the GE rich-burn LEC concept. This is an adaption of the RQL (rich quench lean) concept where there is a rich combustor primary zone to provide low CO and HC emissions and good ignition capability. NOx formation rates are low in the primary zone because the flame temperature of the rich primary mixture is relatively low, and there is little free oxygen available to form NOx. Flow exiting the primary zone is rapidly diluted, or “quenched”, to a uniform lean mixture. With this concept, fast and uniform mixing during the quenching process is critical in order to minimize the time available for NOx formation as the mixture goes through stoichiometric fuel air ratio, where maximum flame temperatures lead to maximum NOx formation rates. Over the past 35 years, the LEC combustor has been developed to reduce NOx by 25-50% relative to first generation combustors. The rich burn combustion process is shown in Figure 4. Figure 3 GE Low Emissions Combustor Evolution Page 10PDF Image | TAPS II Combustor Final Report
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