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Russia Power - March 2013Unrestricted © Siemens AG 2013 All rights reserved.
Flexible steam turbine solutions for combined heat and power in combined cycle power plants
Christian Helesch, Product Line Management Steam Turbine
Unrestricted © Siemens AG 2013 All rights reserved.
Table of content
Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 2
Siemens solutions for combinedheat and power in CCPPs
Requirements of district heating
Combined heat and power in different power plants
Development of power plant types
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 3
Fossil market view and forecast for whole installed capacity within expectations of analysts
International Energy Agency2030 - IEA
5.000
CoalOilGasNuclear
External Study
EIA: Energy Information Administration, July 2011(most recent available data)CERA: Cambridge Energy Research Associates (Vortex Scenario (=mid Scenario)), Oct. 2012 WEO: World Energy Outlook 2012 (New Policies Scenario), Oct. 2012Figures rounded
World Nuclear & Fossil Power Capacity (Large and Small) per fuel type [GW]
Combined cycle power plant market is rising in the next yearAlso a increase in combined heat and power in CCPPs is forecasted
2011
4.000
34%1459
42%2234
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 4
Combined heat and power in different power plants -Design
Low pressure turbine inner casing for CCPP without extraction
Low pressure turbine inner casing for SPP with extraction for feed water preheating
Turbines for CCPP generally are not prepared for steam extraction
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 5
Combined heat and power in different power plants -Thermodynamics
Steam Power Plant• Complete power output from steam
turbine• Steam flow reduced by feed water
preheating
Combined Cycle Power Plant• 2/3 power output from gas turbine• 1/3 power output from steam turbine• Steam low increased by inductions
Steam mass flow of SPP is twice as much as the steam mass flow of CCPP(for CHP for the same power plant output)
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 6
Requirements for district heatingDifference between district heating and process steam
District heating steam• Small range of extraction pressure level• Floating requirements for amount of steam
(Summer/Winter)• High deviation in plant load vs.
requirement of constant pressure level
Process steam• Wide range of extraction pressure level• Mainly constant over the year
(desalination, distillation columns etc.)• Deviation in plant load vs. requirement of
constant pressure level
Max. pressure level defines feed water temperature• 150°C 6bar*• 70°C 0.4bar*
*with 10% piping loss and 5K terminal temperature difference
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 7
Requirements for district heatingDriver for performance
The main drive for performance with regard to heat extraction is the number of extractions stages in the steam turbine
Example for a CCPP with about 600MW electrical output
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 8
Combined heat and power in different power plantsChallenges for CCPP
• Generally no extraction in CCPPdesign changes for extraction flangesrising performance with rising number of extraction stages
• High and floating steam extraction, even in part loadbig extraction flanges in relation to turbine sizeadditional measure for low load: erosion and cooling
• Constant pressure level for every load neededaggregate to throttle steam required
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 9
Siemens solutions for combined heat and power in CCPPs – 1 stage extraction
Combined HP/IP turbine LP turbine
IP inlet
HP inlet
HP exhaust(cold reheat)
Butterfly valves in cross over pipe to realize const extraction pressure
Extraction form outer casing of combined HP/IP turbine
or
or Extraction from cross over pipe
LP exhaust(to condenser)
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 10
Siemens solutions for combined heat and power in CCPPs – Throttle aggregate
Cross over pipe of steam turbine in a 450MW CCPP and butterfly valve (diameter 1500mm)
Butterfly valve with actuator
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 11
Siemens solutions for combined heat and power in CCPPs – 1 stage extraction
Pros• Low and high level arrangement possible• Applicable for Singleshaft and Multishaft• Low complexity for upgrade
Cons• Performance during heat extraction• Complexity of piping for low level
arrangement
IP extraction line for max extraction of 260MWth in a 450MW CCPP Non return valve IP extraction line
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 12
Siemens solutions for combined heat and power in CCPPs – 2 stage extraction
Combined HP/IP turbine LP turbine
IP inlet
HP inlet
HP exhaust(cold reheat)
LP exhaust(to condenser)
Second extraction in LP casing
Butterfly valve
Extraction from cross over pipeor Extraction form outer casing of combined HP/IP turbine
or
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 13
Siemens solutions for combined heat and power in CCPPs – 2 stage extraction
Pros• Performance during heat extraction• Low and high level arrangement possible• Applicable for Singleshaft and Multishaft
Cons• High complexity of piping for low level
arrangement• Complexity for an upgrade
LP extraction line from LP casing in a 450MW CCPP
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 14
Siemens solutions for combined heat and power in CCPPs – 3 stage extraction
Combined HP/IP turbine LP turbine
IP inlet
HP inlet
HP exhaust(cold reheat)
LP exhaust(to condenser)
Third extraction in LP casing
Butterfly valve
Extraction from cross over pipeor Extraction form outer casing of combined HP/IP turbine
or
Second extraction in L casing
LP extractions
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 15
Siemens solutions for combined heat and power in CCPPs – 3 stage extraction
Pros• High performance during heat extraction• Low and high level arrangement possible• Applicable for Singleshaft and Multishaft
Cons• Highest complexity of piping for low level
arrangement• High complexity for an upgrade
Piping for a 2 stage extraction in a 450MW CCPP
Unrestricted © Siemens AG 2013 All rights reserved.Russia Power - March 2013 Christian Helesch / Product Line Management Steam TurbinePage 16
Some references