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Simple cycle output (ISO) 388 MW(e)
Combined cycle efficiency: > 63%
Derived from proven
Siemens H-class technology
Siemens HL-class gas turbines are paving the way to the next level of efficiency and performance. Derived from proven Siemens H-class technology in an evolutionary development step, the next generation of Siemens 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 63% that will clear the way to the next level with a midterm goal of 65%. The new Siemens HL-class consists of three engines: SGT5-8000HL, SGT5-9000HL and SGT6-9000HL.
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 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 30% GT 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 Siemens SGT6-9000HL combines the best of past experience with newly developed technologies. Thus, efficiency and performance are pushed to the next level.
The new Siemens HL-class – a portfolio consisting of three engines: SGT5-9000HL, SGT6-9000HL and SGT5-8000HL. A modular design approach allows for a substantial number of common parts.
Siemens HL-class is designed for high operational flexibility and has a joint DNA with the proven Siemens H-class:
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.
Siemens has re-invented the methodology for plant construction with a modular Power Core™.
The Power Core™ consists of prefabricated Siemens 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 63% efficiency in combind cycle operation:
SCC5-9000HL 2x1: 1,682 MW
SCC6-9000HL 2x1: 1,154 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).
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)
|Fuel (examples)||Natural gas, LNG, distillate oil. Other fuels on request|
|GT ramp-up||85 MW/min|
|Heat rate||8,519 kJ/kWh (8,074 Btu/kWh)|
|Turbine speed||3,600 rpm|
|Pressure ratio||24.0 : 1|
|Exhaust mass flow||700 kg/s (1,543 lb/s)|
|Exhaust temperature||680°C (1,256°F)|
|NOₓ emissions||down to 2 ppmvd with SCR|
|CO emissions||10 ppmvd|
Simple cycle ratings are gross values at ISO ambient conditions. Actual performance will vary with project-specific conditions and fuel.
SGT6-9000HL CC 1x1/1S
SGT6-9000HL CC 2x1
|Frequency||60 Hz||60 Hz|
|Net plant power output||577 MW||1,154 MW|
|Net plant efficiency||> 63%||> 63%|
|Net heat rate||< 5,714 kJ/kWh (< 5,416 Btu/kWh)||< 5,714 kJ/kWh (< 5,416 Btu/kWh)|
|Number of gas turbines||1||2|
|Steam temperature||> 600° C (> 1,112° F)||> 600° C (> 1,112° F)|
Combined cycle ratings are net values at ISO ambient conditions. Actual performance will vary with project-specific conditions and fuel.
Interactive VR experience
Downloads and support
In our download section, you can find brochures, technical papers, and more. Or you can contact us directly for specific inquiries.
(Charges depending on provider)
(From the German fixed network € 0.14/min.
and from the German mobile phone networks
max. € 0.42/min.)
Around 60 Siemens H-class turbines in commercial operation, with about 650,000 fired fleet hours. Overall, more than 85 units are under contract.
Turnkey plant, subject to innovative agreement between Siemens and Duke Energy to test and validate advanced gas turbine technologies over several years
Start of testing SGT6-9000HL: 2020
Tested technologies will lead to combined cycle efficiency > 63% and a combined cycle power output of 577 MW
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