Flexible steam turbine solutions for combined heat and power in combined cycle power plants
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1 Christian Helesch, Product Line Management Steam Turbine Flexible steam turbine solutions for combined heat and power in combined cycle power plants Russia Power - March 2013
2 Table of content Development of power plant types Combined heat and power in different power plants Requirements of district heating Siemens solutions for combined heat and power in CCPPs Page 2 Russia Power - March 2013
3 Fossil market view and forecast for whole installed capacity within expectations of analysts World Nuclear & Fossil Power Capacity (Large and Small) per fuel type [GW] Nuclear Gas Oil External Study % % IEA International Energy Agency Combined cycle power plant market is rising in the next year Also a increase in combined heat and power in CCPPs is forecasted EIA: Energy Information Administration, July 2011(most recent available data) CERA: Cambridge Energy Research Associates (Vortex Scenario (=mid Scenario)), Oct Figures rounded Page 3 Russia Power - March 2013 WEO: World Energy Outlook 2012 (New Policies Scenario), Oct Coal
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 Page 4 Russia Power - March 2013
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) Page 5 Russia Power - March 2013
6 Requirements for district heating Difference 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* Page 6 Russia Power - March 2013 *with 10% piping loss and 5K terminal temperature difference
7 Requirements for district heating Driver for performance Example for a CCPP with about 600MW electrical output The main drive for performance with regard to heat extraction is the number of extractions stages in the steam turbine Page 7 Russia Power - March 2013
8 Combined heat and power in different power plants Challenges for CCPP Generally no extraction in CCPP design changes for extraction flanges rising performance with rising number of extraction stages High and floating steam extraction, even in part load big extraction flanges in relation to turbine size additional measure for low load: erosion and cooling Constant pressure level for every load needed aggregate to throttle steam required Page 8 Russia Power - March 2013
9 Siemens solutions for combined heat and power in CCPPs 1 stage extraction Butterfly valves in cross over pipe to realize const extraction pressure IP inlet Combined HP/IP turbine LP turbine HP inlet or HP exhaust (cold reheat) LP exhaust (to condenser) Extraction form outer casing of combined HP/IP turbine or Extraction from cross over pipe Page 9 Russia Power - March 2013
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 Page 10 Russia Power - March 2013
11 Siemens solutions for combined heat and power in CCPPs 1 stage extraction IP extraction line for max extraction of 260MWth in a 450MW CCPP Non return valve IP extraction line 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 Page 11 Russia Power - March 2013
12 Siemens solutions for combined heat and power in CCPPs 2 stage extraction IP inlet Butterfly valve Combined HP/IP turbine LP turbine HP inlet or HP exhaust (cold reheat) LP exhaust (to condenser) Extraction from cross over pipe or Extraction form outer casing of combined HP/IP turbine Second extraction in LP casing Page 12 Russia Power - March 2013
13 Siemens solutions for combined heat and power in CCPPs 2 stage extraction LP extraction line from LP casing in a 450MW CCPP 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 Page 13 Russia Power - March 2013
14 Siemens solutions for combined heat and power in CCPPs 3 stage extraction IP inlet Butterfly valve Combined HP/IP turbine LP turbine HP inlet or HP exhaust (cold reheat) LP extractions LP exhaust (to condenser) Third extraction in LP casing Second extraction in L casing Extraction from cross over pipe or Extraction form outer casing of combined HP/IP turbine Page 14 Russia Power - March 2013
15 Siemens solutions for combined heat and power in CCPPs 3 stage extraction Piping for a 2 stage extraction in a 450MW CCPP 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 Page 15 Russia Power - March 2013
16 Some references Page 16 Russia Power - March 2013
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