Steam Turbine Concepts for the Future Volatile Power Market
Power-Gen Europe
June 12 – 14, 2012
Michael Wechsung
Thomas Loeper
Radim Znajda
Siemens AG - Energy Sector
Fossil Power Generation
© Siemens AG 2012. All rights reserved.
.
Agenda
 Situation today and tomorrow
 Measures
HP stage bypass
Controlled HP feed water heaters bypass
HP feed water top heater
 Combination of the measures
 Conclusion
© Siemens AG 2012. All rights reserved
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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Facts about Germany’s power market 2011
Renewables
- more than 64 GW+ renewable power installed
- providing 20 %+ of electrical power
Hard coal fired power plants
Lignite fired power plants
- operating in intermediate load range
- providing base load
- about 3.000 full load operating hours
- about 6.000 – 7.000 full load operating hours
- providing 19 %+ of electrical power
- providing 25 %+ of electrical power
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
Tomorrow (Scenario 2020):
- renewables providing 35 %+ of electrical power
- increase of wind and solar power share
- existing base load will be reduced
This scenario intensifies the situation of thermal power plants.
The increase of electrical power production by renewables
- queries the classical fractions: base, intermediate and peak load
- renewable power and residual load remain
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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Tomorrow
Load requirements today and tomorrow
.
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Efficiency optimization over
a broad load range
20%
Large reserve
power capacity
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
HP stage bypass
Rated condition
.
HP stage bypass valve
is closed
opens
Stop valve
Additional load
Main control
valves are wide
open
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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HP stage bypass
10 % - 15 % main steam increase
 about 50 MW - 70 MW additional output
HP stage bypass
Power Output:
Main Steam:
Reheat Steam:
Condenser:
Fuel type:
Comm. Operation:
1040 MW
270 bar / 600 °C
600 °C
0.053 / 0.042 bar
hard coal
2008
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
Bypass control valve
- 30 minutes
- mbypass / mFW = 0.7
- 40 MW add. power
Feed water control valve
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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Controlled HP feed water heaters bypass
.
Controlled HP feed water heaters bypass
Controlled bypass for
HP feed water heaters
Feed water control valve
The Controlled HP feed water heaters bypass needs only small
adjustments of pipe routing in the turbine building.
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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HP feed water top heater
Installation
- is fed with steam from HP stage
bypass
Use
- is activated at part load
Objective
- final feed water temperature is kept
constant or even increased
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
HP feed water top heater
.
Top heater concept serves for better part load efficiency.
© Siemens AG 2012. All rights reserved
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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Combination of the measures
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
Combination of the measures
.
The combination results in proposed design strategy.
Design point
MS-T and FW-T increase HP stage bypass Controlled HP heaters bypass
© Siemens AG 2012. All rights reserved
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
Conclusion
.
Proposed design strategy depends on plant load profile.
The described measures have to be adapted accordingly.
Ex = 76.75 %
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Power-Gen Europe 2012, Cologne
© Siemens AG 2012. All rights reserved
Thomas Loeper, June 2012
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Conclusion
The proposed design strategy requires measures to additionally improve
operating flexibility:
- Reasonable boiler design also with improved load change rates and
parking load concepts
- Control philosophy encompasses thermodynamical models
- Considering life time consumption
© Siemens AG 2012. All rights reserved
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
Conclusion
.
The proposed design strategy
- ensures lower OPEX by improved part load efficiency
Proposed design startegy vs. current design
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Ratio of proposed and current design
- presents CAPEX reduction potential by smaller design
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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Discussion
Steam Turbine Concepts for the Future Volatile Power Market
- introduced
- is not only for Germany but also it complies with world wide trend to
more renewable power
- the proposed design strategy can be adopted
Thank Your for Your attention.
© Siemens AG 2012. All rights reserved
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012
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Disclaimer
.
Backup
HP stage bypass
The HP stage bypass avoids additional stop
valves by branching of between the turbine
stop valves and control valves.
A single HP bypass control valve
and small bore pipes are feasible.
The increased swallowing capacity keeps the main steam pressure
constant, with effects on feed water and steam systems as well as HP
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turbine design.
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Power-Gen Europe 2012, Cologne
Thomas Loeper, June 2012