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GE, Frame-9E, 1000MW, 50 Hz, Combined Cycle Power Plant, Completely Refurbished

GE, Frame-9E, 1000MW, 50 Hz, Combined Cycle Power Plant, Completely Refurbished

Description

  1. Overview
    1. 1000 mw combined cycle power plant
    2. Make: GE
    3. 50 Hz
    4. Construction started in 1992 and the first unit was commissioned in 1995
    5. The plant had operated as a base load station since start of commercial operation; this operating mode changed to significantly more cyclic operation when the previous gas supply contract and PPA expired in October 2010
    6. Since then, the plant has operated on a merchant basis, purchasing gas at spot prices and selling electricity via the balancing market
    7. Gas prices have been high in recent years, making even modern CCGT plant uncompetitive, with several generators mothballing units and placing under preservation until market conditions changed
    8. Typical load profile has been balancing mechanism runs at minimum load for minimum time, which equates to each GT being on 1 hour notice to synchronize and generating around 70 mw giving a block output of around 220 mw; runs vary between 4 and 6 hours
    9. This is a modern power plant and is well designed and laid out
    10. Completely refurbished
  2. Block 1
    1. 2-on-1 arrangement with a nominal rating of 400 mw
    2. 2 GE-designed frame-9E (9171) 125 mw gas turbines (GT) (manufactured by EGT, Belfort)
    3. 2 Stein Industries HRSGs which generate steam fed into a single 140 mw Alstom steam turbine (STG)
    4. The GTs individually drive a 152 MVA, 11.5 kV GEC Alstom generator, type TA9000GA
    5. The STG generator is also an air-cooled GEC Alstom generator, type TA9000GA, 165 MVA at 11 kV
    6. The GT generators are coupled to Tamini (Italy) 11/30 kV, 158 MVA at 17°C, OFWF generator step up (GSU) transformers and the STG generator to a Tamini 11/300 kV, 173 MVA at 17°C, OFWF GSU transformer
  3. Block 2
    1. 3-on-1 arrangement with a nominal rating of 600 mw
    2. 3 GE-designed frame-9E (9171) 125 mw gas turbines (GT) (manufactured by EGT, Belfort)
    3. 3 Stein Industries HRSGs which generate steam fed into a single 212 mw Alstom steam turbine
    4. The GTs individually drive an air-cooled 152 MVA, 11.5 kV GEC Alstom generator, type TA9000GA
    5. The STG generator is also an air-cooled GEC Alstom generator, type T276/430, 249 MVA at 15 kV
    6. The GT generators are coupled to Tamini (Italy) 11/300 kV, 158 MVA at 17°C, OFWF generator step up (GSU) transformers and the STG generator to a Tamini 15/300 kV, 55 MVA at 17°C, OFWF GSU transformer
  4. Specifications
    1. All HRSGs are dual pressure HP/LP, approximately 75 bar and 4 bar, respectively
    2. Both STG have direct-cooled condensers utilizing cooling water from the river
    3. There are no HRSG bypass stacks to allow open-cycle generation
    4. All seven generators have individual generator step up (GSU) transformers connected to the 275 kV distribution grid
  5. Condition and Maintenance
    1. The turbine generators are all arranged axially in-line with greater than 15 m spatial separation between units
    2. Generators and steam turbines were previously maintained under a long term maintenance service agreement (LTMSA)
    3. The LTMSA was established in March 2005 with Turbocare International Ltd for the large generators and steam turbines and was transferred to Siemens
    4. The agreement is known as an OPSA (Operating Plant Service Agreement), covers spares and repairs, and was open-ended
    5. Generator rewind kits are held for both the 11 kV and 15 kV generators
    6. In addition to the normal operational spare parts, a lot of major strategic spares including a spare LP steam turbine rotor, and spare generator 11 kV and 15 kV rotors
    7. The ex ST2D generator stator was classed as a usable spare
    8. The fire protection systems are good and generally comply with NFPA 850 recommendations
  6. Site and Layout
    1. The plant occupies a large, 40 acre, rectangular shaped site approximately 750 m long by 300 m wide
    2. There is good spatial separation between fuel storage and handling areas and the main power plant equipment
    3. The main power plant equipment, all five gas turbine generators and the two steam turbine generators are within a common turbine hall in the center of the site
    4. HRSGs are outdoor installations to the east of the turbine hall and generator transformers are outdoors on the west of the turbine hall