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GAS SERVICE SOLUTIONS
The New GT11N2 M Upgrade
Performance and operational flexibility
Alstom’s turbine upgrades
bridge the gap between the
latest technological
developments and existing
proven gas turbine designs
to keep your plant
competitive.
Boost plant availability and revenues
The GT11N2 has proven its reliability with high availability figures across the fleet
since its first firing in 1994. Its main area of installation is the 60 Hz market, but it is
also available for 50 Hz applications.
The new GT11N2 M upgrade was developed to meet the future demands of the power
markets. This upgrade has been successfully validated and is now operating in multiple
units worldwide. It offers the possibility to operate the engine in three different
operating modes, depending on your specific market requirements. All three modes can
be selected on demand and online. This flexibility allows electricity costs to be
continuously optimised in your plant.
MAXIMUM FLEXIBILITY TO OPTIMISE ASSETS
CUSTOMER BENEFITS
Flexibility
Three switchable operating
modes for maximum extended
lifetime or extra power output
and efficiency
TPWR/PRSHT/GT11N2M/EN/6.2014/CHE/2217 © ALSTOM 2014. All rights reserved.
Reduced maintenance costs
Extended service intervals of up
to 48,000 EOH
Performance
Up to 12 MW power output
and up to 1.4% (add.) GT
efficiency due to improved
turbine
At peak demand, the new GT11N2 M upgrade package provides maximised power
output and efficiency with its Maximum Continuous Load (MCL) mode. For reduced
power demand, the GT11N2 M operation concept offers the Performance (P) mode or
Lifetime (L) mode to increase the intervals between the hot gas path type C
inspections from 24,000 equivalent operating hours (EOH) up to 48,000 EOH.
Compared to the originally installed configuration the power output and efficiency is
significantly increased in all three operation modes.
The new GT11N2 M upgrade can be fully retrofitted
to the GT11N2* and can be implemented during a
regular C inspection. It is also possible to carry out a
phased upgrade including the first and second turbine
stages, in order to reduce initial investment and utilise
the remaining lifetime of the rear turbine stages.
48,000 EOH
Service interval in
lifetime mode
KEY FEATURES OF THE GT11N2 M TURBINE UPGRADE
The basis for the increase in performance is the completely redesigned turbine blading
in line with Alstom’s proven turbine upgrade technology. State-of-the-art turbine
aerodynamics and cooling coupled with the use of proven base materials and coating
systems ensure the highest possible benefits with maximum reliability.
*Upgrade available for the GT11N2 with 3VGV compressor and EV combustor, gas as main fuel, oil as backup
Reliability
Enhanced component reliability
due to design improvements
and state-of-the-art cooling
Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply
to any particular project. This will depend on the technical and commercial circumstances. It is provided without liability and is subject to change without notice.
Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Alstom contributes to the protection of the environment.
This leaflet is printed on environmentally friendly paper.
Enhanced turbine blading - the M-blading
State-of-the-art 3D profiles are used for all turbine blades and vanes. In order to reduce leakage and therefore improve turbine
efficiency, labyrinth sealings on the rotor heat shields and honeycombs for all vanes have been introduced. The rotor and stator
sealing system has been improved based on GT11N2 field experience in terms of maximum mounting convenience and design
simplicity.
For customers who want to utilise the full lifetime of their GT11N2 standard blading components, Alstom can offer a modular
upgrade of the gas turbine. This modular upgrade consists of the first and second stage of the M blading in combination with the
existing third and forth stage of the standard blading. With this option you can immediately benefit from a performance and lifetime
improvement with a reduced initial investment, which can be followed up with a full upgrade during the next C inspection.
STAGE 1
STAGE 2 & 3
STAGE 4
An enhanced cooling air concept for the
blades and vanes together with a
thermal barrier coating (TBC) for the
first stage components ensures
optimised efficiency and lifetime. Stator
heat shield (SHS) A is separated from
vane 2 as a result of the GT11N2 field
experience, thus improving the lifetime
and optimising reconditionability.
The blades of stages 2 and 3 as well as
the vanes of row 3 are coated with an
anti-oxidation coating. Additionally, a
TBC coating protects the stage 2 vanes.
The vanes of stages 2 and 3 are
separated from the respective heat
shields and have a shrouded vane tip
that, together with the re-designed
rotor heat shields, leads to an optimised
stage efficiency.
The main feature of the blade 4
improvements is the replacement of
the damping bolts with a full airfoil tip
shroud with a two rim design. The
adjacent stator heat shield D is
equipped with a honeycomb to
increase the efficiency of the stage.
Blade 1
M-blading stages 1 to 3 with separated
stator heat shields A & B
FURTHER IMPROVEMENTS
Supplemental design improvements
have been introduced based on the
GT11N2 field experience.
The hot gas casing (HGC) and inlet
segments are now TBC-coated.
Furthermore, the HGC collar and the
cooling of the HGC have been improved.
Improved collar
design
Improved cooling
TBC
Existing components can be upgraded
during reconditioning.
Improved hot gas casing
Stage 4 with
shrouded blade 4
GAS SERVICE SOLUTIONS
THE NEW GT11N2 M UPGRADE
Mode switching, the perfect response
The concept of the new GT11N2 M
turbine upgrade offers you maximum
flexibility in adapting to specific market
requirements. Minor adjustments to the
control system permit online switching
between the MCL, P and L-mode.
When market demand is high, you can
choose the MCL-mode for maximum
power and efficiency. With the P-mode
you have the option to choose the
optimised operation point with regard to
performance and lifetime extension.
When energy demand is low, the unit
can be run in the L-mode with reduced
performance but a major extension of the
interval between C inspections.
Additionally, the CO2 per produced MWh is significantly reduced depending on the
chosen operation mode, resulting in higher revenues, lower fuel costs and a reduced
environmental impact.
By opting for the new GT11N2 M upgrade, the C inspection interval is extended to
48,000 EOH. As a result, two out of four C inspections can be saved over a period of
12 years compared to the original configuration.
Basis: GT11N2 3VGV EV, 8000 EOH per year
A plant-specific study is required in order to define the requirements and benefits for
each individual upgrade.
The new GT11N2 M upgrade can be implemented during a slightly extended
scheduled C inspection.
GAS SERVICE SOLUTIONS
THE NEW GT11N2 M UPGRADE
Performance fully validated
The new GT11N2 M upgrade is based on Alstom’s proven development philosophy
and uses proven base material and coating systems as well as efficient cooling system
designs to improve the components’ lifetime and performance. The design also takes
into account extensive field experience to improve the lifetime and optimised
reconditionability of the components.
REDUCING
COST OF ELECTRICITY
With online switching capability between three operation modes, the new GT11N2 M
upgrade offers improved operational flexibility, making it possible to adapt to specific
market requirements.
An important part of Alstom’s development process and introduction of new products
into the fleet is the whole engine validation of the upgrade. The GT11N2 M was
successfully implemented and validated in a GT11N2 in Taiwan in 2008 and is now
operating in its second C-cycle. All components were assessed to be in very good
condition, confirming the design calculations and allowing further optimised product
positioning.
LOWERING
ENVIRONMENTAL FOOTPRINT
TPWR/PRSHT/GT11N2M/EN/6.2014/CHE/2217 © ALSTOM 2014. All rights reserved.
INCREASING
FLEXIBILITY & RELIABILITY
BENEFITS
For more information on the
New GT11N2 M Upgrade please contact
your local Alstom representative.
ALSTOM (Switzerland) Ltd.
Brown Boveri Strasse 7
5401 Baden - Switzerland
Visit us online: www.alstom.com
Basis: GT11N2 3VGV EV
All values at ISO conditions, base load, gas operation, GT only
Specific benefits in power output and efficiency are dependant on the status and limitations of the existing plant.
Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply
to any particular project. This will depend on the technical and commercial circumstances. It is provided without liability and is subject to change without notice.
Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Alstom contributes to the protection of the environment.
This leaflet is printed on environmentally friendly paper.