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Alstom, BBC GT13B, Gas Turbine Power Plant, 252 MW, 50 Hz

Alstom, BBC GT13B, Gas Turbine Power Plant, 252 MW, 50 Hz

Description

  1. Overview
    1. Complete power plant including Siemens master control station
    2. 2 gas turbine groups consisting of 2 gas turbines
    3. Approximately 500 operating hours (used emergency supply)
    4. Fully operational, as good as new
    5. Immediately available
  2. Introduction
    1. The gas turbine power plant (GTPP) consists of four fossil-fueled (fuel: light heating oil) gas turbines made by Brown Boveri (later ABB and now Alstom), type BBC GT13B, with an individual capacity of 63 MWel and a total capacity of 252 MWel
    2. The GTPP was originally intended as a backup system to supply emergency power to the adjoining nuclear power plant and to cover load peaks in the surrounding electricity grid
    3. It is connected to the 50 Hz transmission grid through the public network switchgear
    4. The plant was designed and built as a fast-start plant that can be brought up to full-load operation within approximately 5 minutes
    5. It is currently changed to diesel fuel operation but can be installed as gas power plant with newest technology updated by Siemens engineers with Siemens technology
    6. The equipment has approximately 500 operating hours and is fully operational
  3. Technical Description
    1. Layout of the plant: It is installed in its own separate turbine house, along with the necessary associated auxiliary systems
    2. Each pair of gas turbine sets is arranged in parallel and connected to a common exhaust stack
    3. The two gas turbine groups are located on opposite sides of the central corridor through the turbine house, with their generators facing each other
    4. The turbine house level is at the same height as the surrounding grounds
    5. A gas turbine set essentially consists of a combustion chamber, a gas turbine (compressor and turbine), a generator, and an exciter unit
    6. There is a starter unit for each pair of gas turbines
    7. Access to the plant: The plant and its individual components are easily accessible
    8. The turbine platform is at the same height as the turbine house
    9. The shared turbine house crane, with a load capacity of 50 t, can be moved over all parts of the plant without hindrance, which is advantageous for installation and dismantling activities
    10. The intake housings for the individual compressors are arranged accordingly below the turbine house crane level, with inlets routed sideways to the walls of the turbine house
    11. The central corridor of the turbine house between the turbine groups leads directly to the building entrance, which is large enough to accommodate heavy load vehicles suitable for the GTPP
    12. Main components and interfaces to other components: A gas turbine set consists of a combustion chamber, a gas turbine (compressor and turbine), a generator, and an exciter unit, along with all associated control devices, control valves and stop valves
    13. The generator coolers are integrated into the housings of the individual generators
    14. Each plant also has an oil supply system for control, lubrication and shaft lifting, including the associated valves, oil pumps and tanks
    15. Interfaces include: exhaust outlet of the gas turbine after the exhaust diffuser and exhaust line to the connection flange at the inlet to the exhaust stack (interface is the sliding collar at the bottom of the stack)
    16. On the fresh air side before the compressor inlet on the connection frame of the compressor intake housing at the outlet of the intake housing after the intake filter, above the gas turbine set
    17. Fuel supply from the main valve of the fuel line and the following control valves for the combustion chamber (the fuel line after the buffer tank belongs to the plant, along with the return line)
    18. Cooling water inlet and outlet before each generator cooler, at the respective stop valve
    19. Electrical handover after the electrical pass-throughs and generator branch lines above the turbine sets, before the busbars of the common central transformer system (outside the building)
    20. The overall plant also includes: the starter units, the central compressed air system, the electrical switchgear for operation of the plant, and the central control system equipment (Siemens T3000) and control console
    21. The oil supply system, including the bearing oil tank and bearing oil cooler, is part of the plant
    22. The fuel control cabinet for controlling the plant and the fuel pump unit
    23. The central transformer after the electrical busbars is not part of the sellable GTPP system
    24. The intake silencers and exhaust silencers, including housings, belong to the building component
  4. Mode of Operation and Condition of the Overall Plant
    1. The GTPP was operated as a peak load system until 2013
    2. After that it was operated as an on-call emergency system (short-term load), resulting in a further reduction in the operating hours per calendar year
    3. The plant is visually in very good condition
    4. It is clean and well maintained, and the necessary labeling of components and valves is in perfect condition
    5. There are no externally visible signs of leakage
    6. There has been no foundation settling of the overall plant over the entire life cycle to date, so there has been no cause for internal misalignment
    7. This can also be seen in the good to very good vibration characteristics of the plant
    8. The measured vibration data of all units yielded very good vibration values in the lower region of zone A
    9. However, there is no constant vibration registration by the control system, only vibration monitoring at the individual bearing blocks
    10. There have also been no external lightning strikes in the nearby electrical grid over the entire life cycle to date, so the probability of concealed internal damage to the generators is negligible
    11. Due to the mode of operation (peak load) and the very low number of equivalent operating hours, the plant is in very good condition with low wear