1 1

Primary Zone Air

Dilution Zone Air

Primary Zone Air inlet Air

_r Control Valve

Dilution Zone Air

Fig. 17-30 Staged Combustors. Source: General Electric Company

Fig. 17-31 DLN Combustor. Source: General Electric Company

Fig. 17-32 Fuel-Staged DLN Combustor Operating Modes. Source: General Electric Company

Fig. 17-31 DLN Combustor. Source: General Electric Company flow from the burners, to eliminate flame temperature peaks. The process is aided by the lower O2 content in the second combustion chamber, which inhibits NOx formation. Typically, at start-up and idle, fuel is injected only into the primary zone.

As shown in Figure 17-30, there are two basic staged combustor designs: fuel-staged and air-staged. These designs may also be combined. In the simplest fuel-staged design, fuel flow is divided between two flame zones so that the amount of fuel fed to a stage is matched to the amount of available air at each operating condition. In an air-staged design, a fraction of the airflow from the flame zone is diverted to the dilution zone under low loads. A

Fig. 17-32 Fuel-Staged DLN Combustor Operating Modes. Source: General Electric Company currently used two-stage pre-mixed DLN combustor is shown in Figure 17-31. As shown in Figure 17-32, this combustor has four distinct fuel-staged operating modes.

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