SIEMENS GT COMPRESSOR & TURBINE
SIEMENS GAS
SIEMENS GAS
TURBINE V94.2
ROTOR
Function of Rotor
Function of Rotor
To carries the compressor & turbineTo carries the compressor & turbine
blades.
blades.
Compressor convert the torque intoCompressor convert the torque into
kinetic energy
kinetic energy
Turbine convert the kinetic energy intoTurbine convert the kinetic energy into
torque.
Components of the Rotor
1. Front hollow shaft 2. Balance planes
3. Compressor wheel 4. Central hollow shaft 5. Turbine wheel
6. Rear hollow shaft 7. Tie rod
8. Damping ring 9. O-ring seal
Function of Compressor
Stator Blades
To deflect the air stream passing
through the blade passages in a direction of rotation of the rotor.
VIGV to vary the inlet air flow. This
improve the efficiency of the unit under part load condition.
Compressor Stator Blade Airfoil Dovetail root Stator Blade carrier Outer ring Inner ring Double hook
Variable Inlet Guide Vane Airfoil Pin Pin Stator Blade carrier Outer ring Inner ring
Function of Compressor
Stator
To secure the stator blades rings with
the stator blades in position.
To transmit the reaction forces due to
flow & pressure to the outer casing
The VIGV is to vary the sucked-in air
mass flow & to improve the partial load efficiency.
VIGV
ADJUSTING SYSTEM
MOTOR SET RING BEARING
Function of Compressor
Rotor Blades
To convert mechanical energy into
kinetic & potential energy of the air.
To pressurize the air. (16 stages)
Compressor Rotor Blade
Airfoil
Blow-off valves
3 Blow-off valves.
2 blow-off valves at stage 5
Blow-off V1.1 & 1.2 close at 2900rpm
1 blow-off valve at stage 10
Blow-off V2 close at 2300rpm
To prevent compressor surge.
Surge : Air flow unstable, hunting & causes vibration.
Compressor surge
protection
GT will trip when
Speed more than 42 Hz (2520rpm)
and
DP SW
Comp Surge Protection Speed > 2520rpm(42Hz) DP < 30 mbar GT trip Compressor 2nd Stage Air from filter house Drain
Compressor Technical Data
Compressor flow rate : 468kg/s Compressor ratio : 1 : 10 Compressor stages : 16
Compressor outlet press : 10 bars Compressor outlet temp : 330 deg C Blow-off valves : 3
Blow-off valve 1.1 & 1.2 at stage 5 close at speed : 2900rpm Blow-off valve 2 at stage 10
Function of Turbine Rotor
Blades
To convert the thermal energy of the
hot gas into mechanical energy. (4 stages)
To drive the compressor & the
Turbine rotor blades.
They are made from high temperature
alloys to withstand the high mechanical & thermal stress.
The first stage rotor blades are cast hollow
blades with ducts for guiding the cooling air.
The 2nd stage rotor blades are provided with
several ducts extending radial through the airfoil.
The blades are coated to reduce high
Turbine rotor blade
Cooling
air inlet Cooling air outlet
Hottest at bigger end (4)
Function of Turbine
Stator
To secure the stator blades in position. To transmit the reaction forces due to
Function of Turbine
Stator Blades
Together with the rotor blades, the
turbine stator blades convert the energy of the working fluid into mechanical energy.
Function of Center Casing
To connect stator blade carrier to the
exhaust casing.
To contain the internal pressure.
To accommodate the compressor &
turbine internals.
Function of Exhaust
Casing
To support the bearing at the turbine
end.
To provide flow paths for the gas.
Act as stationary diffuser to minimize
Function of Exhaust
Diffuser
To pass the exhaust gas into the stack
or HRSG
To decrease the gas velocity &
Function of Inner Casing
To direct the flow of hot gas from the
two combustion chambers to the turbine blades.
To provide compressor air passing
Function of Compressor
Shaft Glands
To prevent the ingestion of air
containing oil at the compressor intake.
To reduce the internal leakage losses
between the individual stages at the inner diameter of the stator blades.
To adjust the flow of seal air to the
Compressor bearing housing
Shaft Gland Shim
Stator blade row Seal air duct
Rotor disc Labyrinth seal
9 Central hollow shaft 10 Ducts
11 Labyrinth seal
12 Compressor exhaust diffuser 13 Protective liner
Function of Turbine Shaft
Glands
To minimize the clearance losses.
To prevent the hot gases from leaking
through the spaces between the stator & rotor.
The shaft gland at the turbine exit
prevents the escape of the hot gas
into the atmosphere & the ingress of seal air into the bearing space.
1 Second-stage stator blade 2 Third-stage stator blade 3 Fourth-stage stator blade 4 X-ring 5 Seal ring 6 L-ring 7 Inner shroud 8 Hole 9 L-ring 10 Inner shroud 11 Hole
Function of Cooling &
Seal Air
To cool turbine rotor & stator metal
temperature to below permissible operating temperature.
To protect components not designed
for high temperature application from direct contact with the combustion gas flow.
Function of Compressor
Bearing Housing
To support the rotor & the turbine/
compressor unit.
It forms part of the outer casing &
connect stator blade carrier to the compressor intake casing.
Function of Turbine Bearing
Housing
To support the rotor in the exhaust
casing.
Function of Combine
Journal & Thrust bearing
Support the rotor at the compressor
end.
To compensate the axial thrust & To locate the rotor in axial position.
Function of Journal
Bearing
To support the rotor in the bearing