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Power generation
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Power generation
For any E-LNG scheme, power-plant availability is key.
Operated under island-type conditions without the possibility
to export or import electricity, Siemens’ expertise and
experience as the leading OEM supplier of turnkey power
plants worldwide makes all the difference in ensuring
ultimate reliability.
LNG plants are typically located remotely from populated
areas, frequently without access to stable and robust powertransmission
networks. As a result, power stations for
E-LNG plants operating in island mode have to meet special
requirements, including self-controlled system frequency
with fast response capability, steep load gradients, and tolerance
for harmonics. Specifically, measures have to be
implemented to ensure a fast transfer of electric loads within
such island power systems to keep the liquefaction
process running within specifications. Only then, the core
benefit of five years or more of uninterrupted service
offered by the E-LNG design concept can be fully leveraged.
Air cooled standardized
combined-cycle
power plants in modular
construction are
cost effective, environmentally
friendly
and highly reliable
generating facilities
for E-LNG plants.
Combined-cycle schemes for optimum efficiency
An initial decision for operators and investors to make is
choosing the type of power plant and the method of
financing and building it. Self-cooled combined-cycle power
plants are the proven state-of-the-art solution, outperforming
simple-cycle power plants with about 40 percent
higher thermal efficiency and a 30 percent reduction in
greenhouse-gas emissions. They consist of gas turbines,
waste-heat recovery boilers, and steam turbines to make
maximum use of the feed gas, and reduce emissions.
Building such power stations in accordance to the manufacturer’s
standardized modular design results in cost
effective projects and yields maximum value for owners
and investors. While Siemens delivers simple-cycle power
plants as well, combined-cycle schemes are recommended
for their superior performance.
Combined-cycle schemes for optimum efficiencyAn initial decision for operators and investors to make is
choosing the type of power plant and the method of
financing and building it. Self-cooled combined-cycle power
plants are the proven state-of-the-art solution, outperforming
simple-cycle power plants with about 40 percent
higher thermal efficiency and a 30 percent reduction in
greenhouse-gas emissions. They consist of gas turbines,
waste-heat recovery boilers, and steam turbines to make
maximum use of the feed gas, and reduce emissions.
Building such power stations in accordance to the manufacturer’s
standardized modular design results in cost
effective projects and yields maximum value for owners
and investors. While Siemens delivers simple-cycle power
plants as well, combined-cycle schemes are recommended
for their superior performance.
Ensuring continuous productivity
In order to guarantee uninterrupted supply of electricity
even during unscheduled outages of turbogenerators, surplus
generation capacity has to be installed in the power
plant and operated at all times. Following the so-called n+1
principle, an additional turbogenerator provides the positive
spinning reserve that prevents temporary overloading
of generators in the event of one unit failing. In the E-LNG
concept, all turbines and generators operate continuously
in part-load, capable of assuming full load in a very short
time, without affecting the power output or the refrigeration
process. The cost of the additional generator is easily
compensated through additional 15+ productive days per
year an E-LNG plant achieves compared to traditional gas-turbine driven plants. However, if an adequate powergrid
connection is available at or near the project site, the
n+1 generator may be omitted.
Adapted to specific E-LNG power plant needs
Gas turbines are typically designed for maximum efficiency,
meaning maximum firing temperatures. In order to optimize
the whole economic model of an LNG plant taking into
account the importance of availability, the gas turbines are
adapted and operated at lower firing temperatures. This
allows the operator to achieve exceptionally long maintenance
intervals up to six years for a major overhaul while
having fast load reserve available during operation.
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Financing tailored to customer needs
Siemens’ standardized power-plant designs are modular and
expandable, pre-engineered to a large extent, and make use
of local content wherever appropriate. These designs are
easily and cost-effectively integrated into E-LNG plant projects.
Independent power-producer (IPP) concepts are available
for alternative financing schemes of such power plants,
removing CAPEX from the project balance sheet and paying
power-consumption charges from the OPEX budget instead.
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Related Links
 References
Power Generation
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