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
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
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 6000 7000 full load operating hours - providing 25 % + of electrical power Page 3
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
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
HP stage bypass HP stage bypass valve is closed opens Rated condition Additional load Stop valve Main control valves are wide open Page 6
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
Controlled HP feed water heaters bypass Bypass control valve - 30 minutes - m bypass / m FW = 07-40 MW add power Feed water control valve Page 8
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
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
HP feed water top heater Top heater concept serves for better part load efficiency Page 11
Combination of the measures Page 12
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
Conclusion Proposed design strategy depends on plant load profile The described measures have to be adapted accordingly Page 14 Ex = 7675 %
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
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
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
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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