page_title: AD700
section_title: Phase 3 - COMTES 700
hierarchical_section_title: AD700 / Phase 3 - COMTES 700
caption_attribution_description: English: Turbine inlet valve
context_page_description: The AD700 technology initiative began in the early 1990s with the idea of developing a range of advanced materials that would permit the raising of main and reheat steam temperatures in pulverized fuel boilers up to 700 °C and beyond.
context_section_description: The basis of the current phase of AD700 program, COMTES 700, is a general technical concept for a Component Test Facility (CTF) which allows the testing of plant components at an affordable cost.
  COMTES 700, started in 2003, represents the third phase of the AD700 program and is an agreement between a group of suppliers and generators on the requirements of a comprehensive testing program for materials, financing possibilities and political constraints.
  The overall objective of the project was the design, manufacture, erection and operation of a facility that allows the testing of the following plant components.
  The above image is a flow diagram of the CTF which is installed in the coal-fired power plant Scholven F located in Gelsenkirchen (Germany.  The steam flow of 2,200 t/h produces a net output capacity of 676 MW.  The steam for the testing purpose of the CTF (12 kg/s) is taken from the inlet header of the superheater (SH1) and is led to the evaporator panel, where it is heated to 600 °C (1,112 °F).  Steam is further heated in the test superheater to 705 °C before entering either the high pressure bypass test valve, or being cooled and mixed with the main superheater steam (SH 4). In the first case, the steam, after leaving the high pressure bypass test valve is cooled and passed through the re-heater (RH 1) outlet header.
  The component test facility (including the Goodwin alloy 625 valve) is installed in the coal-fired power plant “Scholven F” located in Gelsenkirchen (Germany). The valve casting has been in service operating at 705 °C (1,301 °F), and in 2009 was taken off line for performance inspection after 20,000 hr operation.
  The extended testing of key components is to enable performance data (manufacturing, bending and welding) to be gathered on a range of advanced materials including T24, HCm12, TP310 N, HR3c, Alloy 714, Alloy 617 and Alloy 740.  The test program of approximately 20,000 operating hours will provide data on:
  in-plant monitoring
  determination and evaluation of residual service life
  in-service inspection
  operational testing of Ni-based alloys for tubes, pipes and valves
  gathering of information on magnetite layer on the rib on internal rifled tubes
  assessment of the operational behavior of all components
  determination of flue gas corrosion and steam oxidation behavior of the materials
  determination of erosion effects due to soot blowing
  The test results from CTF operation will be evaluated.
  The driving force behind the COMTES 700 project was a grouping of European power generators collectively known as the EMAX Power Plant Initiative.  From this group a consortium was formed to support the project with a substantial financial contribution.  Members of this consortium are EDF (France), Electrabel (Belgium), Elsam (Denmark), EnBW (Germany), PPC (Greece), RWE (Germany) and Vattenfall (Sweden/Germany).  The project is steered by the COMTES700-partners consortium and co-ordinated by VGB.
caption: Turbine inlet valve
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