Turbine Cw Pipe Status Updated2
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Transcript of Turbine Cw Pipe Status Updated2
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PRESENTATION
ON
Steam Turbine (685 MW)-GMR Energy.
by
VIVEK PATHAK
Date : 9th April 12
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GMR ENERGY steam Turbine(2X685MW)
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CONTENTS
1 INTRODUCTION(685 MW STEAM TURBINE2 TURBINE DESIGN FEATURES.
3 TURBINE CHARECTERSTICS.
4 TURBINE WEIGHT- WISE BREAK UP
5 TURBINE CATENARY
6 BEARING
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Technical Specification
The Steam turbine is 685 MW,3000 rpm , a tandem compounded 4 flow ,four casings.Itconsists of High pressure Turbine, intermediate pressure Turbine and Two low pressure
turbines with 850.9mm last stage buckets.
The Unit uses off-shell design two(2) main stop and four(4) control valves, connecting tothe upper and lower half casing.
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Turbine Design features
Turbine Design Features
:Main steam inlet Pressure: 255 kg/sq.cm Reheat temperature :597*c Reheat pressure:48.14 kg/sq.cm
Rated steam turbine speed:3000 rpm No. of Cylinders:4 cylinder
Compounding Type: Tandem compounded
HP turbine:10stages single flow
IP turbine:2x9 double flow
LP A Turbine: 2x6 double flow
LP B turbine :2x6double flow
Turning Gear Speed: 3 to7 rpm.
Main steam inlet Temperature565*c
Main steam inlet Pressure 255 kg/sq.cm
Reheat temperature597*c
Reheat pressure 48.14 kg/sq.cm
Rated steam turbine speed 3000 RPM
No. of Cylinders 4 CYLINDER
Compounding Type TANDEM COMPOUNDED
HP turbine 10 STAGES SINGLE FLOW
IP turbine 6X2 DOUBLE FLOW
LP A Turbine 6X2 DOUBLE FLOW
TURNING GEAR SPEED 3 TO 7 RPM
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HP Turbine Characteristics:
HPT uses double casing construction with first stage in the nozzle box. HPT Diaphragms are centre line supported in the hp inner casing.
HP inner casing centre line with HP outer casing.
HP casing is centre line supported on the front standard.
Bearing #1 and Bearing#2 are Tilting pad.
IP Turbine Characteristics: Double Flow
2 nos of exhaust which feed a single cross over pipe to LPT
Bearing #3 and Bearing #4 are tilting pad
LP Turbine characteristics: Double flow.
Eleptical bearing.
Nozzle spray cooling at the diffuser both end.
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HP casing
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Material of construction
:
HP outer casings :ZG1Cr1Mo1 HP inner casing :ZG1Cr1Mo1
IP outer casing :ZG1Cr1Mo1
IP inner casing: ZG1Cr1Mo1
LP casing: Q235-B
SHAFT: HP rotor:30Cr1Mo1V
IP rotor:30Cr1Mo1V LP Rotor:30Cr2Ni4MoV
TURBINE CASING
HP outer casings ZG1Cr1Mo1
HP inner casing ZG1Cr1Mo1
IP outer casing ZG1Cr1Mo1
IP inner casing ZG1Cr1Mo1
LP casing Q235-B
SHAFT
HP rotor 30Cr1Mo1V
IP rotor 30Cr1Mo1V
LP Rotor 30Cr2Ni4MoV
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Turbine blades
Dovetail : Fastening of bucket to rotorVane : conversion of thermal energy to torque energy.Cover :control of leakage of steam passing through the end of the vaneto reduce the bucket vibrationTenon : Fastening of the cover at the vane tip to the bucket.
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Material of construction
BLADES(First Stage)
HP moving blades:2Cr11Mo1NbV HP stationary blades:ZG2Cr12NiMoW1V
IP moving blades:2Cr11Mo1NbV
IP stationery blades:2Cr11Mo1VNbN
LP moving blades:1-4 Stages-1Cr13,
5-6 stage-2Cr12NiMo1W1V LP stationary blades:ZG1cr13
OTHER STAGES: HP moving blades:2Cr12NiMo1W1V
HP stationary blades:ZG2Cr12NiMo1W1V IP moving blades:2Cr11Mo1VNbN
IP stationery blades:2Cr12NiMo1W1V
LP moving blades:1-4 Stages-1Cr13, 5-6 stage-2Cr12NiMo1W1V
LP stationary blades:2Cr12NiMo1W1V
BLADES(First Stage)
HP moving blades 2Cr11Mo1NbV
HP stationary blades ZG2Cr12NiMoW1V
IP moving blades 2Cr11Mo1NbV
IP stationery blades 2Cr11Mo1VNbN
LP moving blades blades:1-4 Stages-1Cr13,5-6 stage-2Cr12NiMo1W1V
LP stationary blades ZG1cr13
OTHER STAGES
HP moving blades 2Cr12NiMo1W1V
HP stationary blades ZG2Cr12NiMo1W1V
IP moving blades 2Cr11Mo1VNbN
IP stationery blades 2Cr12NiMo1W1V
LP moving blades 1-4 Stages-1Cr13, 5-6 stage-2Cr12NiMo1W1V
LP stationary blades 2Cr12NiMo1W1V
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Turbine weight wise breakup
HP TURBINE:
HP Rotor:18 MT HP diaphragm:8MT
HP inner Casing:35.2 MT
HP outer casing:72.9 MT
HP Standard:18.1 MT
Total HP Turbine:152.2MT
IP TURBINE IP ROTOR:36.3 MT
IP diaphragm:32.1 MT IP inner casing:55.3 MT
IP outer casing:104.5 MT
IP Standard: 22.7 MT
Total IP Turbine:250.9
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Turbine weight wise breakup
LP TURBINE:
LPA ROTOR :56.6 MT
LPB ROTOR:56.8 MT
LP Diaphragm(A& B each):111.584 MT
Hood Extension:73 MT
LP hood (TE&GE):136.6 MT
CROSS OVER PIPE:63.4 MT
GENERATOR:414.673MT Generator Rotor:74.628 MT
Generator Stator:283.836 End shields:22.845MT
Domes:17.706MT
High Voltage Bushing:1.634
Excitor collector Housing:4.086
Cooler (empty):9.98
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TURBINE BEARING ARRANGEMENT
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Types of bearing Used in Steam turbine:Elliptical bearing-Radial type of simple journal Bearing.
Tilting type bearing-self aligned ,radial type journal bearing.
Thrust bearing: pad type of journal bearing for axial thrust of rotor
TURBINE BEARINGS
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THRUST BEARING:Double collarPosition at middle standard.
Used for axial position and Thrust load of rotor.
Size of thrust bearing:2258 sq. cm
Bearing pad made of copper back to increase bearing heat transfer.
ELLIPTICAL BEARING:
TURBINE BEARING
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TILTING PAD BEARING:
Improved dynamic performance of the rotor-bearing system.
Bearing adaptability to shaft movements as a result of to the ability
of the shoe to tilt.
Uniformly distributed oil flow from equidistant radial feed holes.
Increased stability due to greater damping.
Lower spare parts costs since only the pads need to be changed.
Used Where there are larger temp. changes and therefore greatermis-Alignment potential.
TURBINE BEARING
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NOZZLE BOX & DIAPHRAGM
Steam flow concerns:(A) Steam path contour(B) Nozzle area(C) Nozzle angle(D) Flow coefficientFull and partial arc admission system
Nozzle & Diaphragm
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Lower bending Stress and deflection due to the high stagepressure drop.
In the smaller diaphragms ,nozzle partitions are inserted intothe punched band for easier welding and to maintain properuniform throat condition between partitions.
Larger diaphragms nozzle partitions are welded directly tofabricated or forged outer rings and inner web plates.
Nozzle & Diaphragm
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STEAM PATH CONTOUR
Steam Balance holes are provided.
Removable Radial strips segment
Smaller rotor packing diameter andmore packing Teeth
Steam balance holes control thrust
STEAM PATH CONTOUR
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TURBINE VALVESMax. travel of Main stop valve stemis 330mm
Max. travel of control valve is stem
is 216mm.Max. travel of combined reheatvalve stem is 673mm
TURBINE VALVES
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TURBINE EXTRACTION STEAM PRESSURE & TEMPERATURE
S.NO EXTRACTIONPOINT
PRESSURE
TEMP. STEAM(T/HR)
HEATER
1 HP-7 STAGE 77.36 391.91 166.201 HP HEATER-8
2 CRH PIPE 48.56 330.62 231.956 HP HEATER-7
3 IP-15 STAGE 17.03 450.06 94.522 HP HEATER-6
4 IP-19 STAGE 7.78 335.42 44.987 DEARATOR
5 LP A/B-20STAGE
4.76 287.81 62.325 LP HEATER-4
6 LP A/B-21STAGE
2.45 216.11 97.255 LP HEATER-3
7 LP A/B-24STAGE
.65 92.55 49.083 LP HEATER-2
8 LP A/B 24
STAGE
.29 67.58 41.055 LP HEATER-1
TURBINE EXTRACTION