Our HL-class gas turbines are paving the way to the next level of efficiency and performance. Derived from proven H-class technology in an evolutionary development step, the next generation of advanced air-cooled gas turbines uses a series of new, but already tested technologies like super-efficient internal cooling features for blades or vanes and an advanced combustion system to increase firing temperature.
A technology carrier to the next level with a combined cycle efficiency beyond 64%, with a midterm goal of even higher efficiencies. The HL-class consists of two engines: The SGT5-9000HL for 50 Hz, and the SGT6-9000HL for 60 Hz.
Testing the big one – Insights into test sites of HL-class gas turbines
Efficiency, flexibility and hydrogen capability are key levers in driving the decarbonization of the energy industry – which also makes the HL-class a future-proof gas turbine. Get exclusive insights into HL-technology – close to reality at the Duke Energy’s Lincoln Combustion Turbine Station, a key testing facility for Siemens Energy’s largest HL-class gas turbine and be part of the virtual tour.
Highlights of the SGT5-9000HL
The gas turbine is capable of world-class fast cold starts and hot re-starts due to the light and stiff rotor with internal cooling air passages and free thermal expansion of rotor and casing parts during transients. Hydraulic Clearance Optimization (HCO), an active clearance control, ensures robustness and low turbine degradation at start-up. GT ramp-up rate 85 MW/min.
The HL-class has been designed to minimize outage times. Rotor de-stacking can easily be done on site thanks to the Hirth-serrated disc assembly. All rotating compressor and turbine blades can be replaced without rotor lift or rotor de-stacking. Turbine blade 1 and turbine blade 4 are removable without cover lift. With 33kEBH service intervals the service concept is very competitive.
When experience meets evolutionary innovation
Based on proven design and relying on the vast fleet experience of the SGT-8000H series, the new SGT5-9000HL combines the best of past experience with newly developed technologies. Thus, efficiency and performance are pushed to the next level.
The HL-class consists of two engines: The SGT5-9000HL for 50 Hz, and the SGT6-9000HL for 60 Hz. A modular design approach allows for a substantial number of common parts.
The HL-class is designed for high operational flexibility and has a joint DNA with the proven Siemens H-class:
- Air-cooled 4-stage turbine
- Steel rotor / Hirth serration / single tie bolt design
- Hydraulic Clearance Optimization (HCO)
- Can-annular combustion system
Tested technologies for higher efficiency and performance
To achieve top performance and efficiency levels, the HL-class turbines are operating at highest combustion temperatures with an advanced combustion system.
An innovative multi-layer thermal barrier coating and super-efficient internal cooling features are protecting turbine blades and vanes while reducing the need of cooling air.
Additionally, advanced 3D blading leads to higher aero efficiency in the compressor. A free-standing, internally cooled turbine blade 4 reduces exhaust losses and allows for higher exhaust temperatures to enhance the water-steam cycle.
Plug-and-Play power core
Siemens Energy has re-invented the methodology for plant construction with a modular Power Core™.
The Power Core™ consists of prefabricated Siemens Energy Solution Blocks and prefabricated pipe racks. These plug-and-play blocks are fabricated and tested in a controlled manufacturing environment and delivered to site as large modules which can be lifted into place for assembly. This results in increased safety on site, accelerated schedules, less dependence on the availability of skilled local labor and in the end lower project risk.
HL-class power plants are based on one or more HL-class gas turbines and can achieve more than 64% efficiency in combind cycle operation:
SCC5-9000HL 1x1: 880 MW
SCC5-9000HL 2x1: 1,760 MW
Designed for low maintenance costs and short outage times
All components are designed with high focus on optimized LCOE, highest availability and serviceability. Several service features are supporting this.
- All rotating blades replaceable without rotor lift/rotor de-stacking
- Easy rotor de-stacking on site due to disc assembly with Hirth serration and central tie rod
- All turbine vanes and blades replaceable without rotor lift; vane 1, blades 1 & 4 replaceable without cover lift
Tremendous service fleet experience and continuous development result in a competitive service concept with 33,000 Equivalent Base Hours (EBH) / 1,250 Equivalent Starts (ES).
Fuel flexibility matters
The SGT6-9000HL runs on natural gas, LNG, distillate oil, or other fuels. The engine is equipped with DLE burners and has the capability to burn up to 50 vol% of hydrogen (H₂).
Performance data for simple cycle power generation
Simple cycle ratings are gross values at ISO ambient conditions. Actual performance will vary with project-specific conditions and fuel.
Performance data for combined cycle power plant
Combined cycle ratings are net values at ISO ambient conditions. Actual performance will vary with project-specific conditions and fuel.