Steam Turbine Concepts for the Future Volatile Power Market

Transcription

1 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

2 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 Page 2

3 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 - operating in intermediate load range - about 3000 full load operating hours - providing 19 % + of electrical power Lignite fired power plants - providing base load - about full load operating hours - providing 25 % + of electrical power Page 3

4 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 Page 4

5 30% 35% 40% 45% 50% 55% 60% 70% 75% 80% 85% 90% 95% Load requirements today and tomorrow 50% 40% Share of time zeitlicher Anteil 30% 20% up to now bisher tomorrow zukünftig * Efficiency optimization over a broad load range Large reserve power capacity 10% 0% 100% 65% Load Last Page 5

6 HP stage bypass HP stage bypass valve is closed opens Rated condition Additional load Stop valve Main control valves are wide open Page 6

7 HP stage bypass 10 % - 15 % main steam increase about 50 MW - 70 MW additional output HP stage bypass Power Output: 1040 MW Main Steam: 270 bar / 600 C Reheat Steam: 600 C Condenser: 0053 / 0042 bar Fuel type: hard coal Comm Operation: 2008 Page 7

8 Controlled HP feed water heaters bypass Bypass control valve - 30 minutes - m bypass / m FW = MW add power Feed water control valve Page 8

9 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 Page 9

10 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 Page 10

11 HP feed water top heater Top heater concept serves for better part load efficiency Page 11

12 Combination of the measures Page 12

13 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 Page 13

14 Conclusion Proposed design strategy depends on plant load profile The described measures have to be adapted accordingly Page 14 Ex = 7675 %

15 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 Page 15

16 IP turbine power Conclusion The proposed design strategy - ensures lower OPEX by improved part load efficiency - presents CAPEX reduction potential by smaller design 1 Proposed design startegy vs current design Page 16 Feed water flow Feed water pump power Hot reheat steam flow Hot reheat steam volume flow Hot reheat steam pressure LP-exhaust flow Exhaust area HP turbine power Ratio of proposed and current design

17 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 Page 17

18 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, wwwsiemenscom and on the SEC s website, wwwsecgov 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 Page 18

19 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 Page 19 The increased swallowing capacity keeps the main steam pressure constant, with effects on feed water and steam systems as well as HP turbine design