Steam Turbine Concepts for the Future Volatile Power Market · Steam Turbine Concepts for the...

Steam Turbine Concepts for the Future Volatile Power Market

© Siemens AG 2012. All rights reserved.

Siemens AG - Energy SectorFossil Power Generation

Power-Gen EuropeJune 12 – 14, 2012

Michael WechsungThomas LoeperRadim Znajda

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Thomas Loeper, June 2012Power-Gen Europe 2012, Cologne

© 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

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Facts about Germany’s power market 2011

Hard coal fired power plants

- operating in intermediate load range

- about 3.000 full load operating hours

- providing 19 %+ of electrical power

Renewables

- more than 64 GW+ renewable power installed


Lignite fired power plants

- providing base load

- about 6.000 – 7.000 full load operating hours


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Tomorrow

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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Load requirements today and tomorrow

0%

10%

20%

30%

40%

50%

30%

35%

40%

45%

50%

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

Last

zeitl

iche

r Ant

eil bisher

zukünftig *up to now

tomorrow

Load

Shar

e of

tim

e

Efficiency optimization over a broad load range

Large reserve power capacity

.



HP stage bypass

Stop valve

HP stage bypass valve

Rated condition

Main controlvalves are wideopen

Additional load

is closedopens

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Power Output: 1040 MWMain Steam: 270 bar / 600 °C Reheat Steam: 600 °CCondenser: 0.053 / 0.042 barFuel type: hard coalComm. Operation: 2008

HP stage bypass

HP stage bypass

10 % - 15 % main steam increase

about 50 MW - 70 MW additional output

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Bypass control valve

Feed water control valve

- 30 minutes

- mbypass / mFW = 0.7

- 40 MW add. power

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Feed water control valve

Controlled bypass for HP feed water heaters

The Controlled HP feed water heaters bypass needs only small adjustments of pipe routing in the turbine building.

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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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Top heater concept serves for better part load efficiency.

.




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The combination results in proposed design strategy.

Design point

HP stage bypass Controlled HP heaters bypassMS-T and FW-T increase

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Conclusion

Proposed design strategy depends on plant load profile.

The described measures have to be adapted accordingly.

Ex = 76.75 %

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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

.



Conclusion

The proposed design strategy

- ensures lower OPEX by improved part load efficiency

- presents CAPEX reduction potential by smaller design

Proposed design startegy vs. current design

Feed w

ater fl

owFee

d wate

r pum

p pow

erHot

rehea

t stea

m flow

Hot reh

eat s

team vo

lume f

low

Hot reh

eat s

team pr

essu

reLP

-exha

ust fl

ow

Exhau

st are

aHP tu

rbine

power

IP turbi

ne po

werRat

io o

f pro

pose

d an

d cu

rren

t des

ign

1

.



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.

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Disclaimer

This document contains forward-looking statements and information – that is, statements related to future, not past, events. These statements may be identified either orally or in writing by words as “expects”, “anticipates”, “intends”, “plans”, “believes”, “seeks”, “estimates”, “will” or words of similar meaning. Such statements are based on our current expectations and certain assumptions, and are, therefore, subject to certain risks and uncertainties. A variety of factors, many of which are beyond Siemens’ control, affect its operations, performance, business strategy and results and could cause the actual results, performance or achievements of Siemens worldwide to be materially different from any future results, performance or achievements that may be expressed or implied by such forward-looking statements. For us, particular uncertainties arise, among others, from changes in general economic and business conditions, changes in currency exchange rates and interest rates, introduction of competing products or technologies by other companies, lack of acceptance of new products or services by customers targeted by Siemens worldwide, changes in business strategy and various other factors. More detailed information about certain of these factors is contained in Siemens’ filings with the SEC, which are available on the Siemens website, www.siemens.com and on the SEC’s website, www.sec.gov. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described in the relevant forward-looking statement as anticipated, believed, estimated, expected, intended, planned or projected. Siemens does not intend or assume any obligation to update or revise these forward-looking statements in light of developments which differ from those anticipated.

Trademarks mentioned in this document are the property of Siemens AG, it's affiliates or their respective owners.

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BackupHP 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 turbine design.

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