Hanwha Power’s Sequential Fuel Injection (SFI) system is engineered for gas turbines that need deeper turndown capability for flexible dispatch. Designed as an enhancement for turbines equipped with LEC III, LEC NextGen, and DLN-1 combustion systems using inlet bleed heat (IBH), SFI extends turndown to 35% load while maintaining NOx and CO emissions within permit limits. That represents a 15% improvement over IBH-only operation. SFI is applicable to B/E-class gas turbines and is installed as an add-on to the existing combustion system during a standard outage.
Dual Combustors. Smarter Performance.
SFI is built around a series arrangement of two combustors. A smaller second combustor is placed downstream of the primary liner and injects fuel directly into the aft end of the combustion zone. This design enables extended turndown while keeping NOx and CO emissions within permit limits—without sacrificing heat rate or efficiency.
The Ideal Partner for Hydrogen and Flexible Fuels
SFI works seamlessly with additional PSM technologies like ExB (Exhaust Bleed) and AutoTune, expanding the operability window and enabling reliable performance in hydrogen blends and alternate fuels. It helps plant operators meet future fuel flexibility demands today.
SFI FAQs
SFI is Hanwha Power’s Sequential Fuel Injection system,designed to extend gas turbine turndown to 35% load while maintaining NOx andCO emissions compliance. SFI uses a series arrangement of two combustors: asmaller secondary combustor downstream of the primary liner injects fuel intothe aft end of the combustion zone, enabling deeper turndown withoutsacrificing heat rate or efficiency. This represents a 15% improvement overinlet bleed heat (IBH) alone.
SFI is designed as an enhancement for gas turbines equippedwith Hanwha Power’s LEC III, LEC NextGen, or OEM DLN-1 combustion systems thatuse inlet bleed heat (IBH). SFI also works with Hanwha Power’s Exhaust Bleed(ExB) system and AutoTune for additional turndown and emissions optimization.
Yes. SFI is compatible with hydrogen blends and alternatefuels, working alongside Hanwha Power’s AutoTune and Exhaust Bleed systems tomaintain stable combustion and emissions compliance across varying fuelcompositions.
Related Technologies and Services
Complementary Technologies:
LEC III: Low-Emission Combustion
FlameSheet: Advanced Combustion System
