SGT6-9000HL heavy-duty gas turbine (60Hz)

Pushing efficiency and performance to the next level

drag to rotate

Proven single tie bolt rotor. Rotor air cooler allows proven steel disc design

Hydraulic Clearance Optimization (HCO) - reduced degradation and clearance losses

Advanced combustion system for high efficiency (ACE) with dual fuel capabilities

12-stage, third generation harmonized compressor, evolutionary 3D blading

Innovative multi-layer coating for blades and vanes for better blade robustness

Super-efficient internal cooling features for blades and vanes

Large free-standing turbine blade 4 for higher power output

4-stage turbine: high cycling capability through fully internal air-cooling

Simple cycle output (ISO) 388 MW(e)

Combined cycle efficiency: > 63%

Derived from proven
Siemens H-class technology

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Technology

The next generation of Siemens advanced air-cooled gas turbines

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.

The result:

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.

Press release for the Siemens HL-class

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Highlights of the Siemens SGT6-9000HL

Fast start-up capability

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.

Advanced combustion system for high efficiency (ACE)

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.

Advanced coatings

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.

Minimized maintenance costs and outage times

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.

Easy plant integration

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.

Derived from proven H-class technology

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:

Hydraulic Clearance Optimization (HCO)
Single tie bolt with Hirth serration
4-stage air-cooled turbine
Can-annular combustion system

When experience meets evolutionary innovation

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:

Air-cooled 4-stage turbine
Steel rotor / Hirth serration / single tie bolt design
Hydraulic Clearance Optimization (HCO)
Can-annular combustion system

One portfolio with common design

Common parts minimize manufacturing risks and shorten lead times

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Rapid answer to the grid

World-class fast cold starts and hot-restarts due to the light and stiff rotor with internal cooling air passages

GT ramp-up 85MW/min

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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.

Evolutionary 3D blading

for higher aero efficiency

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Advanced combustion system

for higher firing temperatures and more operational flexibility

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Innovative multi-layer coating and ultra-efficient internal cooling features for blades and vanes

for better blade robustness and less cooling air consumption

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Large free-standing turbine blade 4

for higher power output

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Plug-and-Play power core

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

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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).

Fast maintenance with service-friendly design

for reduced down times

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Simplified outage

through easy burner replacement thanks to innovative robot technology
(picture: exemplary application – SGT5-8000H burner replacement)

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Designed to fullfil environmental requirements

While reaching highest levels of performance and efficiency, the HL-class is still complying with NO_X and CO regulations.

NO_X emissions: Down to 2 ppmvd (with SCR)

Core engine