turbine cw pipe status updated2

7/31/2019 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

turbine cw pipe status updated2

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