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.
The result:
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.
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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 advanced can-annular combustion system with dual fuel capability allows for higher firing temperatures and more operational flexibility. 25 premix burners improve the fuel/oxygen mixing. The ACE combustion system allows for GT turn-down to 21% minimum environmental load.
All turbine blades and vanes are equipped with an innovative multi-layer thermal barrier coating. This leads to higher combined cycle efficiency due to less cooling air consumption and reduced operational costs due to higher blade robustness.
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.
Due to proven and validated package and plant concepts the HL-class can easily be integrated in our power plants for simple cycle or combined cycle operation. This enables fast project execution. More than 50,0000 hours are saved on site due to modularized design and pre-engineered solutions.
The new HL-class is based on the reliable engine architecture of the SGT-8000H series with design features that have proved reliability in operation for years:
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 Energy H-class: Air-cooled 4-stage turbine, steel rotor / hirth serration / single tie bolt design, Hydraulic Clearance Optimization (HCO), can-annular combustion system
Common parts minimize manufacturing risks and shorten lead times
World-class fast cold starts and hot-restarts due to the light and stiff rotor with internal cooling air passages
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.
for higher aero efficiency
for higher firing temperatures and more operational flexibility
for better blade robustness and less cooling air consumption
for higher power output
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
All components are designed with high focus on optimized LCOE, highest availability and serviceability. Several service features are supporting this.
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).
for reduced down times
through easy burner replacement thanks to innovative robot technology
(picture: exemplary application – SGT5-8000H burner replacement)
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).
While reaching highest levels of performance and efficiency, the HL-class is still complying with NOx and CO regulations.
NOx emissions: Down to 2 ppmvd (with SCR), or ≤25 ppmvd (without SCR).
Power output | 593 MW(e) |
Fuel (examples) | Natural gas, LNG, distillate oil. Other fuels on request |
Frequency | 50 Hz |
GT ramp-up | 85 MW/min |
Gross efficiency | > 43% |
Heat rate | < 8,375 kJ/kWh (< 7,938 Btu/kWh) |
Turbine speed | 3,000 rpm |
Pressure ratio | 24.0 : 1 |
Exhaust mass flow | 1,050 kg/s (2,315 lb/s) |
Exhaust temperature | 670°C (1,238°F) |
NOₓ emissions | down to 2 ppmvd with SCR, down to 25 ppmvd without SCR |
CO emissions | 10 ppmvd |
| SGT5-9000HL CC 1x1 / 1S | SGT5-9000HL CC 2x1 |
---|---|---|
Frequency | 50 Hz | 50 Hz |
Gross plant output | 880 MW | 1,760 MW |
Gross plant efficiency | > 64% | > 64% |
Plant turn down | < 40% | < 40% |
Gross heat rate | < 5,625 kJ/kWh (< 5,331 Btu/kWh) | < 5,625 kJ/kWh (< 5,331 Btu/kWh) |
Number of gas turbines | 1 | 2 |
Pressure/reheat | Triple/Yes | Triple/Yes |
Steam temperature | > 600° C (> 1,112° F) | > 600° C (> 1,112° F) |
| Core turbine |
---|---|
Approx. weight | 497,000 kg (1,095,700 lb) |
Length | 13.0 m (42.6 ft) |
Width | 5.3 m (17.4 ft) |
Height | 5.5 m (18.1 ft) |
In our download section, you can find brochures, technical papers, and more. Or you can contact us directly for specific inquiries.
Around 85 Siemens Energy H-class turbines in commercial operation, with more than 2 million fired fleet hours. Overall, about 100 units are under contract.
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