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70 MW Gas Turbine Plant with Heat Recovery Boiler

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70 MW Gas Turbine Plant with Heat Recovery Boiler

Technical Description:

Werk III 70 MW Gas Turbine Plant with Heat Recovery Boiler

Plant at a Glance

Main facts

  • BBC Model 13 C gas turbo-generating set, built in 1974 as a single-shaft
    plant.
  • Multi-fuel firing chamber: natural gas, extra light fuel oil, or mixed
    operation.
  • 17-stage compressor and 5-stage turbine in a single-shell design.
  • Rated speed: 3,000 rpm.
  • A water-injection system was installed in 1998 to reduce NOx emissions to
    below 300 mg/Nm3.

How the plant works
1. Fuel enters the firing chamber.
2. The compressor and turbine form the gasturbine train.
3. Hot exhaust gas flows through a silencer
to the heat recovery boiler.
4. The boiler produces steam for the steamcycle system.

Nominal gas turbine load
0 MW
Full load
0 MW
Gas + steam configuration
0 MW
Total operating hours
0 h

Gas Turbine System

Gas turbine configuration

  • Single-shaft gas turbine plant with a separate firing
    chamber.
  • The firing chamber is connected to the compressor and
    turbine casing by a double U-tube.
  • 17-stage compressor and 5-stage turbine.
  • Hot exhaust gas is routed through the exhaust duct and
    silencer to the heat recovery boiler.
  • Oil cooling is provided by heat exchangers and oil
    filters using cooling water.

Generator & Main Transformer

Generator

  • Three-phase synchronous generator connected to the
    turbo-generating set through an intermediate shaft.
  • Generator voltage: 10.5 kV.
  • Frequency: 50 Hz.
  • Speed: 3,000 rpm.
  • Static excitation.
  • Water-air generator cooling.
    Main transformer
  • Voltage ratio: 10.5 / 115 / 122 / 129 kV.
    Transformer rating: 105 MVA.
    Mains voltage: 110 kV.

Heat Recovery Boiler

Boiler design

  • Forced-circulation heat recovery boiler with pre-heater,
    evaporator and superheater modules.
  • Water and steam are separated in an external boiler drum.
  • The water-steam circuit uses one boiler circulation pump
    and two boiler feed pumps.
  • Bare-tube heating surfaces were replaced with fin-tube
    heat exchangers in 1998 to increase performance.
  • Generated steam is used in a 40 MW steam turbine; the
    supplied brief states that this steam turbine is not part of the sale.
    Steam and boiler data
    Steam output: 150 t/h
    Design pressure: 51 bar(g)
    Steam temperature: 470 C
    Chimney height: 50 m
    Pumps: 2 KSB feed pumps + 1 KSB circulation pump
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