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(1)

SIEMENS GT COMPRESSOR & TURBINE

(2)
(3)

SIEMENS GAS

SIEMENS GAS

TURBINE V94.2

(4)
(5)

ROTOR

(6)

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.

(7)

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

(8)
(9)

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.

(10)

Compressor Stator Blade Airfoil Dovetail root Stator Blade carrier Outer ring Inner ring Double hook

(11)

Variable Inlet Guide Vane Airfoil Pin Pin Stator Blade carrier Outer ring Inner ring

(12)

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.

(13)
(14)

VIGV

 ADJUSTING SYSTEM

MOTOR SET RING BEARING

(15)

Function of Compressor

Rotor Blades

 To convert mechanical energy into

kinetic & potential energy of the air.

 To pressurize the air. (16 stages)

(16)

Compressor Rotor Blade

 Airfoil

(17)

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.

(18)
(19)

Compressor surge

protection

GT will trip when

 Speed more than 42 Hz (2520rpm)

and

(20)

DP SW

Comp Surge Protection Speed > 2520rpm(42Hz) DP < 30 mbar GT trip Compressor 2nd Stage  Air from filter house Drain

(21)

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

(22)
(23)

Function of Turbine Rotor

Blades

 To convert the thermal energy of the

hot gas into mechanical energy. (4 stages)

 To drive the compressor & the

(24)

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

(25)

Turbine rotor blade

Cooling

air inlet Cooling air outlet

(26)

Hottest at bigger end (4)

(27)

Function of Turbine

Stator

 To secure the stator blades in position.  To transmit the reaction forces due to

(28)
(29)

Function of Turbine

Stator Blades

 Together with the rotor blades, the

turbine stator blades convert the energy of the working fluid into mechanical energy.

(30)
(31)
(32)

Function of Center Casing

 To connect stator blade carrier to the

exhaust casing.

 To contain the internal pressure.

 To accommodate the compressor & 

turbine internals.

(33)
(34)
(35)

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

(36)
(37)

Function of Exhaust

Diffuser

 To pass the exhaust gas into the stack 

or HRSG

 To decrease the gas velocity & 

(38)
(39)

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

(40)
(41)

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

(42)

Compressor  bearing housing

Shaft Gland Shim

Stator blade row Seal air duct

Rotor disc Labyrinth seal

(43)

9 Central hollow shaft 10 Ducts

11 Labyrinth seal

12 Compressor exhaust diffuser 13 Protective liner

(44)

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.

(45)

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

(46)
(47)

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.

(48)
(49)
(50)
(51)

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.

(52)
(53)

Function of Turbine Bearing

Housing

 To support the rotor in the exhaust

casing.

(54)
(55)

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.

(56)
(57)

Function of Journal

Bearing

 To support the rotor in the bearing

References

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