turbine mannual

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JHARSUGUDA 9135MW CAPTIVE POWER PLANT PROJECT

Client: SEPCO ELECTRIC POWER CONSTRUCTION CORPORATION

No. 26-W9-YX-01 TURBINE OPERATION RULES (A) Total 151 Pages

Operation Instruction

SEPCOIII


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JSG CPP TURBINE OPERATION RULES

CONTENTS

PART 1 Overview

Chapter 1 Specification of Main Equipment 5

Chapter 2 Specification of Auxiliary Equipment

14

PART 2 Unit Start-up

Chapter 1 Cold Start of the Unit .26

Chapter 2 Warm & Hot Start of the Unit ...38

PART 3 Unit Operation

Chapter 1 Operating Parameters of Steam Turbine

42

Chapter 2 Operating Modes of the Unit ....47

Chapter 3 Regular Works and Requirements ..49

PART 4 Unit Shutdown


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Chapter 15 Generator parallels off, while turbine does not trip ...77

Chapter 16 Generator parallels off, and turbine trips 77Chapter 17 Turbine trips, while the generator does not parallel off 78

Chapter 18 Failure of Thermodynamic Power Supply 78

Chapter 19 High Bearing Temperature of Turbine-generator Unit 79

Chapter 20 Burning out of Turbine-generator Bearing Bush .79

Chapter 21 Steam Turbine Shaft Bending 80Chapter 22 Steam turbine Overspeed ..82

Chapter 23 Feed water pump set outlet check valve is untight and rotates

reversely.83

Chapter 24 Turbine-generator unit operates at abnormal frequency

83

Chapter 25 Boiler Fire Extinction 84

Chapter 26 Treatment of Accidents & Abnormity of the Motor ..85

PART 6 Auxiliary Equipment & Common Service System

Chapter 1 General Operating Rules of Auxiliary Equipment..

89


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Appendix 2: Cold Start Curve at Sliding Parameters

.148Appendix 3: Warm & Hot Start Curve

..........149

Appendix 4: Normal Shutdown Curve ....150

Appendix 5: Shutdown Curve at Sliding Parameters151


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Chapter 1 Specification of Main Equipment

1.1 Specification of steam turbine equipment

Model: N135-13.73/537/537

Type: super-high pressure, primary reheating, double cylinder, double-flow, single shaft,

extraction and condensing steam.

Rated power: 135MW

Initial steam pressure: 13.73Mpa (a)

Initial steam temperature: 537


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Rated speed: 3,000 rpm

Feed water temperature under rated condition: 244.4Max back pressure at which the unit is permitted to operate: 18.6kpa (a)

Regeneration stages: 2 HP heaters, 4 LP heaters & 1 deaerator

Length of the last blade of LP cylinder: 690mm

Critical speed of shafting: 1,950r/min for HP & MP rotor

2,450r/min for LP rotor

1,260r/min for generator rotorStages of flow path: total 39 stages:

HP cylinder: 1 governing stage + 13 pressure stages

MP cylinder: 13 pressure stages

LP cylinder: 26 pressure stages

1.3 Description of turbine characteristics

1.3.1 This unit can carry the base load of power network, as well as can be used as two-shift or

peak regulation unit.

1.3.2 This units operating time at no load when rejecting load must not exceed 15 mins.

1.3.3 This units operating time without steam must not exceed 1 min.

1.3.4 This units idle time with full vacuum after trip is about 45 mins and that without vacuum is

b t 15 i


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pressure is 20.3kPa (a).

1.3.9 The unit is permitted to run for long when the exhaust temperature of steam turbine is lessthan 79 . The max temperature at which exhaust is permitted to operate is 120 .

1.3.10 Permitted load variation rate of unit is:

1.3.10.1 From 100% to 50% MCR 5%/min

1.3.10.2 From 50% to 20% MCR and from 20% to 50% MCR 3%/min

1.3.10.3 Below 20%MCR 2%/min

1.3.11 The pressure after the governing stage must not exceed 10.34Mpa (a) at different workingconditions.

1.4 General description of steam turbine

1.4.1 Brief introduction of steam turbine proper

1.4.1.1 Steam turbine type is: super-high pressure, primary reheating, double-flow and single

shaft arrangement, reaction extraction and condensing type, which characteristics include:

combination of HP and IP cylinder, reverse arrangement of through-flow parts, inlets of initial

steam and reheat steam centered on the middle part of HP & MP cylinder and radial diffusion

double-flow type of LP cylinder.

This units shafting is supported by three points: HP & MP rotor connected with LP rotor by rigid

coupling while the LP rotor connected with the generator rotor by semi-flexible coupling,

t t d d t t f d d b k d ith th th ti b i i


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The turbine unit is 13.5 meters long in total and arranged on the 9m operation floor, with a

combination of HP initial steam stop valve and HP governing valve mounted on both sides in the

front which is supported on the holder of main stop valve, 4 flexible HP steam inlet pipes

connected with the 4 governing valves and the HP cylinders upper and lower steam inletsrespectively, and governing valve controlled by oil servo-motor.

The high pressure nozzle section consists of four groups of nozzle segments, with each group

containing 29 nozzle steam paths and steam inlet flow of each group controlled by the

corresponding governing valve. The unit can reach rated power by 3 valves opening fully and the

fourth group provides guarantee for the availability of rated power in summer and at low

parameters.

HP & MP cylinder is single-floor cylinder with 1 governing stage and 13 pressure stages in the HP

part. There is a section of steam extraction led to HP heater #1 after stage 10, and steam

exhausted by HP flows through lower cylinders exhaust port and HP exhaust check valve to the

reheater, a portion of which is led to HP heater #2 as regenerative extraction.

The reheated steam flows to MP part via MP combined valve through two rigid steam inlet pipes.

Th 13 t i MP t ith thi d t t ti t d t ft t 7


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protect all bearings from damage.

LP cylinder is equipped with atomizing nozzle type low-load spray regulator inside that mayoperate to spray automatically in the case where the LP cylinder exhaust temperature is higher

than 80 so as to ensure normal operation of the unit.

1.4.1.2Dummy piston & thermal shroud

Dummy piston: Because this units HP & MP rotor blade adopts reaction blade which reaction

degree is higher and rotor thrust is also great correspondingly, the rotor is processed into several

dummy clubs for the use of balancing the thrust on the blade. HP & MP cylinder has three dummypistons in all, including the dummy piston on HP exhaust side, on HP steam admission side and

on MP steam admission side. There are two 1334 pipes connecting between the dummy

piston outside chamber on HP exhaust side and MP exhaust chamber, which allows the pressure

on the exhaust side dummy piston outside and that on the MP exhaust side to be equal. At the

same time, there are two 764 pipes connecting between the HP exhaust chamber and

chamber between HP steam admission side dummy piston & MP steam admission side dumpy

piston, through which HP steam is led to the chamber between HP & MP outer cylinder and MP

thermal shroud to cool HP & MP outer cylinder.

Thermal shroud: because high temperature steam flows into HP & MP cylinder directly, there is a

thermal shroud mounted on the inner wall of MP part of HP & MP outer cylinder in order to

prevent HP & MP outer cylinder from influence by high temperature steam. Reheat steam is led

t th i id f th l h d d t i th h th d i t HP t


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The sliding key system is the supporting and locating system of stator part, the steam turbine

proper supporting and locating mode is: front frame, middle frame and rear frame and exhausthood frame are fastened on the foundation by means of foundation bolts and back grouting and

are equipped with front bearing pedestal, middle bearing pedestal, rear bearing pedestal and LP

outer cylinder thereon respectively. Longitudinal keys are arranged on the front frame along the

center axis, the front bearing pedestal can move on its frame along the axis. HP & MP outer

cylinder upper claws are supported on the front and middle bearing pedestal, the lower claws

transverse keys connect with the front and middle bearing pedestal, besides longitudinal keys,there are also transverse keys on some position of the middle frame, and the cross point of

longitudinal and transverse key is the dead point of HP & MP stator part, the front bearing

pedestal HP and MP cylinder and middle bearing pedestal take this as the dead point to perform

axial expansion and contraction. There is a vertical key mounted on both upside and downside of

both ends of HP & MP outer cylinder with key way plate fixed on the neighboring bearing pedestal

for the purpose of smooth expansion and contraction and keeping cylinder center aligning.

1.4.1.5 Thrust bearing

The unit adopts the Michell thrust bearing. The thrust collar integrates with steam turbine, and

both its front and back sides are mounted with positive and negative thrust bearing pads with 12

pieces laid on the whole circle of each. And each pad is equipped with a RTD temperature

measuring device for measuring its metal temperature. The back of thrust bearing pad rests on

ti l d ti l l i t th h i ti hi h i lf li t


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The steam turbine proper shafting consists of HP & MP rotor and LP rotor. Connection between

HP & MP rotor and LP rotor relies on the rigid coupling integrated with main shaft forging, and the

shims in between two halves of coupling are connected with screws. As configured for the

purpose of meeting the requirement of rotor center aligning in assembly, in such a case, the

center on both ends of coupling must keep correct and concordant in assembly so as to allow the

rotor center line to become smooth and continuous curve in operation. The rigid coupling is very

sensitive to the bearing load distribution because of high rigidity, thus its requirements for the

assembly technology and shafting aligning are much higher, but it has such advantages as highstrength, short rotor length, easy processing and reliable operation.

Semiflexible coupling is used in between LP rotor and generator rotor, such coupling has a

corrugated pipe joint on the end coupling connecting with generator rotor, which has certain

flexibility, and connects with an minor axis on the other end coupling, and the minor axis covers

the generator rotor to transmit the torque by means of interference and key, such semiflexible

coupling may allow the unit safety operation not to be affected by slight change in the steam

turbine and generator center in installation and operation.

1.4.2 Technical specifications of governing system

1.4.2.1 The governing system is able to keep idle running of steam turbine at rated steam inlet

condition, rated vacuum and full open main stop valve, with speed oscillation value 6r/min.

1.4.2.2 The governing system is able to guarantee stable parallel operation of steam turbine and

th it


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d. LP cylinder differential expansion reaches +7.5mm;

e. Lubricating oil pressure is lower than 0.06Mpa;

f. Back pressure of the condenser is lower than 20.3kPa;

g. Peak to peak vibration amplitude of the rotor is 0.254mm;

h. Metal temperature of # bearing 1-3 reaches 112, the metal temperature of bearing #4 and #5

reaches 80 or the temperature of thrust bearing reaches 107;

i. EH oil pressure decreases to 9.31Mpa;

j. Power failure to DEH system;k. Exhaust temperature of LP cylinder reaches 121 ;

l. The oil level of the main oil tank is lower than 1245mm;

m. MFT of the boiler;

n. Main protection of the generator operates.

1.4.3.2.2 Oil injection test function

1.4.3.2.3 Emergency governor test function

1.4.3.2.4 Steam turbine reset function

1.5 Heat calculation data of the steam turbine

Name UnitRated

conditions THATMCR VWO

Cutting off all

HP Heaters

Generator end power kW 135,029 135,101 145,005 135,043

T t l t i l t fl f t/h 407 502 410 107 440 000 368 560


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Name UnitRated

conditions THATMCR VWO

Cutting off all

HP Heaters

No.3 extraction flow t/h 8.066 8.47 9.124 9.863

No.4 extraction steam condition MPa/ 0.451/315.8 0.45/315.4 0.484/315.3 0.475/315


No.5 extraction steam condition MPa/ 0.251/248.4 0.25/247.8 0.269/247.8 0.264/247.5


No.6 extraction steam condition MPa 0.067 0.0665 0.0718 0.0705


No.7 extraction steam condition MPa 0.0143 0.0142 0.0152 0.015


Note: Turbine Heat Acceptance condition (THA): means the condition in which the unit can

operate safely and continuously with generators net output power of 135MW when the turbine is

under rated initial steam and reheat steam conditions, back pressure is 8.83kP, make-up water

percentage is 0%, and regenerative system is put into operation all normally and generators

efficiency is 98.35, which heat rate is not more than the acceptance value of 8,402.9kJ/kWh.

Turbine maximum continue rate (TMCR): means the condition in which the unit can operate

safely and output maximum power when the turbine is under rated initial steam and reheat steam

conditions, back pressure is 8.83kP, make-up water percentage is 3%, and regenerative system

is put into operation all normally and generators efficiency is 98.35.


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Chapter 2 Specification of Auxiliary Equipment

2.1 Specification of heater2.1.1 Specification of HP heater

Item Unit HP heater #2 HP heater #1

Model JG-530-2-00CK JG-530-1-00CK

Design pressure of shell side Mpa 3.0 4.5

D i t t f h ll id 350/250 390/260


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Design temperature of tube

side

100 100 260 350

Working pressure of tube side Mpa 1.724 1.724 1.724 1.724

Working pressure of shell side Mpa 0.0152 0.07257 0.2693 0.454

Working temperature of tube

side 55 69.45 109.05 138.25

Working temperature of shell

side 55 90.63 129.9 150.6

Manufacturer Shanghai Power Equipment Co., Ltd.

2.1.3 Specification of deaerator and deaerated water tank

2.1.3.1 Specification of deaerator

Class Class I Test pressure 1.374MPa

Model GC-514 Pressure drop of nozzle 0.0588MPa

Design pressure 0.88Mpa (g) Opening pressure of safety valve 0.85MPa

Design temperature 380 Operating modeSliding pressure

operation

Max working pressure 0.78Mpa (a)Corrosion allowance (tank

/deaerator)1.6/2.5mm

R t d t t 514t/h O t t f tl t t 7PPb


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Inlet water pressure MPa 1.48 0.6837

Outlet water pressure MPa 19.18 1.48

Shaft power kW 2733.9 128.7

Rotating speed r/min 4686 2982

Working temperature 166.7 166.7

Medium density kg/m3 900.59 900.59

Intermediate bleed-off pressure (stage 2) MPa 8

Intermediate bleed-off flow m3/h 35.5

Guarantee efficiency % 81.32 80.84

ManufacturerShanghai Power Equipment

Maintenance Works Co., Ltd.

2.2.2 Specification of feed-water pump motor

2.2.2.1 Specification of feed-water pump motor

Item Unit Specification

Model YKOS3700-2

Rated power kW 3,700

Rated voltage V 6,600

Rated current A 370

Rated speed r/min 2,982


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2.2.3.1 Parameters of hydraulic coupling

Item Unit SpecificationModel R17K.2-E

Motor speed r/min 2,986

Output speed r/min 4,783

Max output power kW 3,000

Slip % 3

Scope of speed governing % 25-100

Efficiency % 94.7

Capacity of oil tank m3 0.85

Manufacturer Germany VOITH

2.2.3.2 Auxiliary equipment of coupling

Item Unit Auxiliary oil pumpWorking oil

cooler

Lubricating oil

cooler

Model CB-B125 LY54 LY16

Oil flow m3/h 7.5 30 17

Pressure MPa 0.25

Cooling surface area m2 54 16


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Inlet & outlet diameter mm 300

Manufactured by Shanghai Power Equipment Research Institute

2.3.3 Circulating water booster pump

Specification of circulating water booster pumpSpecification of circulating water

booster pump motor

Model 10Sh-9A Model Y250M-4

Shaft power 40 kW Voltage 415 V

Lift 30 m Current A

Rotating speed 1,480r/min Power 55 kW

Flow 420 t/h Power factor

Efficiency 80% Rotating speed 1,480 r/min

Manufactured byShijiazhuang Kingda Pump

Co, Ltd.Manufactured by Xian Motor Works

2.3.4 Indoor circulating sump pit blowdown pump

Specification of indoor circulating sump pit

blowdown pump

Specification of indoor circulating

sump pit blowdown pump motor

Model 40PV-SP Model Y112M-2

Shaft power 3.1kW Voltage 415V

Lift 15m Current A

Rotating speed 1,800 rpm Power 4 kW

Fl 25t/h P f t


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diaphragm with fillet; the seal ring of LP diaphragm seal is mounted in the septalium and fixed

with spring leaf.

2.4.2 Shaft seal heater


Model JQ-50-1

Heating surface area m2 50

Design flow of main

condensate flowm3/h Total flow, 300 minimum

Design pressure MPa Tube side 3.1, shell side 0.1

Working pressure MPa Tube side 2.00

Test pressure MPa Tube side 3.9, shell side 0.125

Design temperature Tube side 100, shell side 100

Working temperature Tube side 60, shell side 100

Net weight t 2.23

2.4.3 Shaft seal fan:

Specification of shaft seal fan Specification of the motor

Model AZY-09.32-020.0-01 Model 132S

Full pressure 9.32kPa Power 7.5kW

Speed 2,900r/min Speed 2,900r/min

Fl 20 3/ i V lt 415V


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Co., Ltd.

2.5.2 Specification of condensate pump

Specification of condensate pump Specification of the motor

Model 7LDTNB-6PJS Model YLKK400-4

Flow 350m3/h Power 280kW

Lift 190m Voltage 6,600V

Npsh 2.2m Current 31AShaft power 223kW Rotating speed 1,487r/min

Rotating speed 1,487r/min Insulation class F

Manufactured byShenyang Pump Co.,

Ltd.Manufactured by

Shenyang Electric

Machine Works

2.5.3Vacuum pump

Specification of vacuum pumpSpecification of the

motor

Specification of

vacuum pump cooler

Model: 2BW4 253-0EK4 Model: Y315M-8 Model: M16

Min. suction pressure (min. vacuum degree):

3.3kpa (a)Voltage: 415V

Heat exchange surface

area: 9m2

P i it 44k /h ( i l t C li t i l t


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Efficiency: 61 Insulation class: F

Manufactured by: Shanghai Hualian Pump Co.,Ltd.

Manufactured by: Jiamusi Electric MachineWorks

2.6 Specification of steam turbine lubricating oil system

2.6.1 Main oil tank

Dimension (lengthdiameter) 5,8103,020 mm

Maximum volume 40 m3

Working volume 24 m3

Operating oil level 1,808mm

Maximum oil level 2,616mm

Minimum oil level 1,245mm

Suction level of oil injector 1,045mm

2.6.2 Oil coolerModel GX-64P

Cooling surface area 240m2

Working temperature Above 0

Flow 80l/min

Test pressure 21bar

E t i ht 1 803k


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Manufactured by: Shanghai HP Oil Pump WorksManufactured by: Shanghai WUYI Electric

Company

2.6.5 AC lubricating oil pump

Specification of AC lubricating oil pump Specification of the motor

Model: YS150-50B Model: YB180M-2

Water head: 36m Power: 22kW

Flow: 133m3/h Voltage: 415V

Rotating speed: 2950r/min Current: 42.2A

NPSH: 4.5m Insulation class: F

Manufactured by: Shanghai Pump WorksManufactured by Shanghai Wuyi Electric

Machine Works

2.6.6 Starting-up oil pump

Specification of starting oil pump Specification of the motor

Model: 150Y-150A Model: Y315S-2

Outlet oil temperature: 1.1 MPa Power: 110 kW

Flow: 186m3/min Rotating speed: 2,982r/min

Lif 130 V l 415V


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Matched power: 3kW Current: 6.4A

Rotating speed: 2,960 r/min Insulation class: B

Manufactured by: Mudanjiang Aidi Electric Power

Technology Co., Ltd.

Manufactured by: Hebei Chengde

Electric Machine Works

2.6.9 Specification of the oil purifying equipment

Model: HCP100 380 50 AS-SD

Power: 3.0kW

Voltage: 415V

Max current: 8.2A

Flow: 100l/min

System working pressure:


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Specification of EH oil pump Specification of the motor Specification of oil cooler

Code: 029-09941-5 Model: Y200L-4 B35 Model: GL02

Model: PV29 2R50 COO Power: 30kW Working pressure: 1.6MPa

Outlet pressure: 13.7MPa Voltage: 415V Working temperature:

100

Setting value of overflow

valve:16.2MPa

Current: 56.8A Cooling surface area: 2.1m2

Rotating speed: 1,470r/min Manufactured by: Shanghai

Lubricating Equipment Plant

Manufactured by Shanghai Wuyi

Electric Machine Works

2.9 Specification of rapid cooling device


Model YQL- 150

Rated air flow m3/min 40

Voltage V 415

Power kW 150

Outlet temperature 400


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The two-stage series connection bypass system is adopted, in which, the flow capacity of HP

pass is considered as 70% of steam flow under VWO condition and the flow capacity of LP

bypass is considered as the sum of HP bypass flow plus HP bypass attemperating water flow.

2.11 Specification of air cylinder:

Design pressure: 1.0 MPa

Design temperature: 100

Maximum working pressure: 0.98 MPaWorking temperature: normal temperature

Working medium : air

Test pressure: 1.25 MPa

Volume: 1.0 m3


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Chapter 1 Cold Start of the Unit1.1 General rules of start-up

1.1.1 Division of the start-up state

According to the inner wall temperature in lower half where HP inner cylinder governing stage is

located, the start-up state of steam turbine is divided into:


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pressure, bearing metal temperature, bearing return oil temperature, thrust bearing pad

temperature, pressure and temperature of initial steam and reheat steam, vacuum of condenser,pressure switch of control system, metal temperature of main cylinders and etc.).

9) Any safety protection or system fails or unit protection operating values are not in accordance

with stipulation.

10) Any one of the following equipment has fault or the corresponding interlock protection test is

unqualified: starting oil pump, AC (DC) lubricating oil pump, jacking oil pump, turning gear, EH oil

pump.

11) The oil level of main oil tank and EH oil tank is lower than the limit value or the oil quality and

cleanliness are unqualified. Lubricating oil inlet temperature is abnormal and return oil

temperature is overhigh.

12) Water seeps through the turbine.

13) Quality of water and steam are not in accordance with requirements.

14) Heat preservation of the unit is imperfect.

15) Other auxiliary equipment or system fails in operation.

1.2 Preparations for start-up


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through test;

14) Instrument and tools used in operation are to be prepared and checked;1.2.2 Tests prior to turbine start-up (after overhaul and minor repair of unit)

1) Static test of turbine governing system;

2) ETS test of turbine;

3) Major interlock test of the unit;

4) Interlock test of starting oil pump, AC lubricating oil pump and DC lubricating oil pump of

turbine, and interlock test of jacking oil pump and exhaust fan of main oil tank;

5) Interlock test of feed water pump;

6) Interlock test of circulating water pump;

7) Interlock test of vacuum pump;

8) Interlock test of condensate water pump;

9) Interlock test of EH oil pump;

10) Protection test of HP& LP heater and deaerator;

11) ON/OFF tests of all motor-operated valves, and pneumatical valves and hydraulic valves;

12) Interlock test of HP & LP bypass devices;

13) Interlock test of circulating water booster pump;


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test. Maintain the oil temperature inside the system within the range of 43~54 .

1.3.9 Put the jacking oil system into operation and put continuous turning of unit into operationafter the jacking oil pressure of all bearings is normal through checking. The unit shall be put into

continuous turning operation for at least more than 4 hours prior to the turbine start-up.

1.3.10 Put the inner cooling water system into operation and adjust the water inlet pressure of

rotor and stator to be < 0.3Mpa.

1.3.11 Put the generators air cooling system into operation.

1.3.12 Start the vacuum pump to build up vacuum of condenser to 30kPa.

1.3.13 After warming up of shaft seal pipe by water drain is normal, start the shaft seal fan to put

the shaft seal system of turbine into operation. The LP cylinder shaft seal steam temperature

shall be within the range of 121~177 . Inform the boiler staff to ignite the boiler when the

vacuum of condenser reaches 70kPa.

1.3.14 Ignite the boiler to increase temperature and pressure.

1.3.15 Put the bypass system (first the LP bypass and then HP bypass) into operation after

warming up the piping. Put the bypass automatic control into operation.

1.3.16 Start the feed water pump according to the water level of steam drum. The water goes via

bypass valve of the HP heaters. Adjust the water flow with feed water bypass (or conduct water


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1.4.2 Check if the display of DEH panel is normal.

1.4.3 Condition and preparation for unit impulsing1.4.3.1 Steam conditions of turbine cold impulsing:

Initial steam pressure: 1.5~1.6Mpa;

Initial steam temperature: 360 ;

Reheat steam temperature: 300 (the temperature of the initial steam and reheat steam

shall have the superheat degree of 50 at corresponding pressure);

Temperature difference between initial steam side and reheat steam side


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1.4.4.1 Put the Operator Auto on IN in Control Mode. Click the button MODE on the upper

left side of the DEN OVERVIEW picture, then the sub-picture CONTROL MODE will appear.Click the button OA and click button IN within 3 seconds to put in the Operator Auto Mode.

1.4.4.2 Reset the low pressure safety oil emergency governor on the head of turbine and check if

the low pressure safety oil is normal;

1.4.4.3 Click LATCH button of hand-controlled panel on control panel DEH MAN PANNEL to

reset the unit. After turbine reset, check the indicator of governor TRIPPED that shall change

into LATCHED reset indicator.

1.4.4.4 Open the Limit Value picture to input valve limit value 120% and click button GO, check

if the valve limit value is set normally and locally check if safety oil pressure is normal. Click the

main stop valve opening button TVOPN on the control panel DEH MAN PANNEL, and locally

check if HP & MP main stop valves are wide open and check if the HP & MP governing valves are

closed after the picture displays that HP & MP main stop valve are wide open.

1.4.4.5 Set the target speed at 500rpm and speed up rate at 50rpm/min on the set value sub-

picture CTRL SP, press button GO, here the turbine starts to impulse and speed up, check the

turbine speed that shall rise step by step.

1.4.4.6 Check the turning gear that shall trip automatically to stop turning motor when the speed


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Superheat degree of initial steam is 50.

1.4.4.9 Continue to set the target speed at 2,500 r/min and speed up rate at 40rpm/min. Jackingoil pump A and B shall stop automatically when the speed reaches 1,500r/min, otherwise stop

them manually;

1.4.4.10 Time of turbine speed up and warming is distributed as follows:

Rotating speed

r/min

Time (min) Temperature of HP

stator lower carrier

( )

Overall expansion

of cylinder

mm

Vacuum of

condenser

Mpa (a)

Speed up Stay

Hold 300~500 10 4 60 1 0.0347

From 500 to 2,500 50 4 130 3.5 0.0213

From 2,500 to 2,96010

2 Above 150 5~6Full

vacuum

Up to 3,000 to

incorporate into

network

10

/ Above 150 5~6Full

vacuum

It requires about 90 min from impulsing to full speed.

1.4.4.11 Make speed up to 2,500 r/min by the operating procedure above-mentioned and warm

up the turbine for 4 min:

a. Reinforce the checking and adjustment of all parts of the turbine during the whole speed-up


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1.4.4.16 Check the main oil pump locally if its outlet oil pressure of is 1.18Mpa, inlet oil pressure

is 0.098~0.3Mpa and operation is normal.1.4.4.17 Check if AC and DC lubricating oil pump interlock are on Auto position, after main oil

pump operates normally through check, stop the starting oil pump and confirm the starting oil

pump interlock is on Auto position.

1.4.4.18 Check if lubricating oil pressure, EH oil pressure and temperature are normal.

1.5 Unit incorporation into power network & initial load on

1.5.1 Generator synchronous paralleling

Hold the speed of unit at 3000rpm and perform an overall check, if everything is normal, advise

the electric personnel to parallel in the generator. After the electric test ends and the automatic

synchronization conditions are fulfilled (with speed at 2950~3050rpm) and upon receiving the

signal ASPERM from electric personnel, press the button MODE on the upper left of DEH

control picture, then MODE sub-picture will appear, press the button and click button IN within 3

seconds to put AUTOSYNCHRONIZATION control mode into operation, the main picture will

display enter the mode AS at the same time.

1.5.2 Checking after generator paralleling in and precautions in load on

1) After paralleling in, the generator is to have 5% active load and to a certain amount of inactive


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1.6.1 After warming up with initial load ends, check if the turbine cylinder expansion is normal

without jamming;1.6.2 Put the governing stage pressure circuit into operation as the case may require in the

process of load up;

1.6.3 Make the load up to 13.5MW (10% of rated load) by means of valve position at a load up

rate of 0.6MW/min.

1.6.4 Check if the auto operation of bypass system is normal, bypass valves close gradually with

rise of unit parameters.

1.6.5 When the load is up to 13.5MW (10% of rated load), steam pressure to 2.0~3.5 Mpa, initial

steam temperature to 450, reheat steam temperature to 400 and the temperature of HP

stator lower carrier to 390, check if the drain valve at upstream of MP combined valve closed

automatically, if not, close it manually.

1.6.6 When the load reaches 27MW (20% of rated load), check if the water spray device closed

automatically according to LP cylinder exhaust temperature, if not, close it manually. It may put

the unit power control circuit into operation at this time.

1.6.7 When the load reaches 27MW (20% rated load):

A. Check if the initial steam pressure is 4~5 Mpa, temperature is 470 and reheat steam


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according to the water level of LP heater, close water drain of LP heater to drain valve of

condenser, and put the auto control of drain into operation when the water level is adjusted to benormal.

1.6.13 When the load reaches 121.5MW (90% of rated load), steam conditions shall be up to

nominal parameters in which initial steam pressure is 13.73Mpa, initial and reheat steam

temperature are 537 :

1.6.13.1 From warming up with initial load to 90% of rated load, the time of steam conditions

reaching the ratings shall be controlled at 120 min;

1.6.13.2 Put the Initial Steam Pressure Control into operation on the DEH panel as the case

may require after initial steam pressure reaches the rating;

1.6.14 Change the control mode of valves from Single Valve Control to Sequence Valve

Control after the unit load reaches over 50MW, and pay attention to the change in load in

changeover.

1.6.15 Continue to make load up until 135MW, perform an overall check and report the check

results to the unit supervisor.

1.7 Precautions in unit start-up


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unit speed up so as not to affect the rotating speed. After the unit paralleling in, check if the

automatic control of bypass is normal and pay attention to that the tracking of attemperating

water shall be normal; the adjustment of the opening extent of HP & LP bypass shall be based on

the need of boiler to prevent too acute oscillation of MP governing valve as a result of too high

steam pressure of boil side and too large opening of bypass, at the same time pay attention to

the pressure difference before and after HP exhaust steam check valve to prevent it from being

closed and causing chocking.

1.7.17 Strictly monitor the water level of HP & LP heater, deaerator and condenser in the process

of start-up.

1.7.18 Temperature rise & decrease rate

Name Temperature rise rateTemperature

decrease rate

Temperature of initial steam


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Chapter 2 Warm & Hot Start of the Unit


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down, so it is inappropriate to maintain the vacuum of condenser and initial steam pressure too

high.

4) In the case where there is excess pressure in boiler, the extraction system must be put into

operation to set up the vacuum of condenser prior to boiler ignition so as to prevent the exhaust

rupture disk of LP cylinder from operating.

2.2 Boiler ignition

2.2.1 The start-up procedure of boiler follows that of Cold start and temperature & pressure rise

follows the Hot Start Curve of turbine.

2.2.2 For hot start, pay attention to maintaining the parameters stable as up to impulsing

parameters.

2.3 Impulsing speed up of turbine

2.3.1 Preparations prior to turbine impulsing

2.3.1.1 Keep continuous turning time more than 4 hours prior to impulsing with the shaft

eccentricity of less than 0.076mm.

2.3.1.2 Feed water pump shall be in good standby condition.

2.3.1.3 Drain water to warm up pipe sufficiently prior to supplying steam to shaft seal, it is strictly


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Max speed in

speed up (r/min)

100

450

Must not be more

than 500

2.3.3 Impulsing speed up of turbine:

2.3.3.1 Checking and tripping operation of DEH panel are the same with that of Cold Start;

2.3.3.2 Fix the impulsing time and speed up rate according to cylinder temperature;

2.3.3.3 Other operations and checking in the process of turbine speed up are the same with that

of Cold Start.

2.3.3.4 Because HP automatic main stop valve, speed governing valve, MP combined valve and

steam lead pipe, etc. parts can cool quickly after shutdown, pay attention to the temperature rise

rate of them in start-up to prevent excessive heating and pay attention to the vibration of unit.

2.4 Unit paralleling in & load on

2.4.1 Operator Auto mode:

2.4.1.1 Make load up to the rated value according to the load variation rate looked up in the Hot

Start Curve;

2.4.1.2 Other operations in the process of unit load up are the same with that of Cold Start.


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2.5.6 Make the unit have initial load according to cylinder temperature as soon as possible after

paralleling in;

2.5.7 Reinforce water drain of the initial steam pipe and turbine proper in hot start to prevent cold

water or steam from flowing into the cylinder in impulsing.

2.5.8 In hot start, prevent overhigh HP cylinder exhaust temperature to parallel in quickly as up to

the rated speed. If necessary, open wider the low pressure bypass to lower the reheat steam

pressure and control the HP cylinder exhaust temperature to be lower than 360 .


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between two sides of initial

steam and reheat steam

HP cylinder exhaust

pressureMPa 2.531 3.0

HP cylinder exhaust

temperature 312.1 321.6

LP cylinder exhaust

pressure

kPa 8.83 20.3

LP cylinder exhaust

temperature


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Note: motor vibration of all auxiliary equipment

It is qualified if bearing pad vibration is < 0.085mm for rotating speed at below 1,500r/min;

It is qualified if bearing pad vibration is < 0.05mm for rotating speed at below 3,000r/min.

1.6 Operating parameters of deaerator

Name Unit ItemOperating

valueOperating result

Water level

of deaeratormm

Normal value 2,550

High value I 2,750 Alarm

High value II 2,850Interlock open the motor-operated overflow

valve of deaerator

High value III 2,950

Interlock close the steam extraction No.3

motor-operated valve and check valve

interlocking, interlock close the motor-

operated overflow valve of the deaerator

when the water level decreases to below

2,750mm;

Low value I 2,350 Alarm

Low value II 680 Feed water pump trip

Pressure of

deaeratorMPa

Normal 0.68 Operate at sliding pressure

Low pressure 0.3 Alarm for low pressure

High pressure 0.85 Safety valve operate


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Name Unit Normal Max Mini Remarks

journal bearing #4-5

Metal temperature of

thrust bearing


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Att. List of Equipment Regular Works

No. Work contents Time requirement Operator Supervisor

1Test of emergency sound &

thermodynamic signalPer shift

Vice operator

on duty

Operator

on duty

2 Check of the oil level gauge of oil tankDaytime shift per

day

Vice operator

on duty

3Moving test of HP & MP main stop

valve

Daytime shift on

Monday

Operator on

duty

Unit

supervisor

4 Moving test of extraction check valves Daytime shift on

Monday

Operator on

duty

Unit

supervisor

5Water drain of main oil tank and feed

water pump oil tank

Daytime shift on

Thursday

Routine

inspector

6 Vacuum leak testDaytime shift on the

5th per month

Operator on

duty

Unit

supervisor

7 Switching of vacuum pump Daytime shift on the10th per month

Vice operatoron duty

Operatoron duty

8Switching of LP heater drain water

pump

Daytime shift on the

10th of per month

Vice operator

on duty

Operator

on duty

9 Switching of industrial water pumpDaytime shift on the

10th per month

Routine

inspector

Operator

on duty

Daytime shift on the Vice operator Operator


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PART 4 Unit Shutdown


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1.1 Preparations prior to unit shutdown

1.1.1 After receiving shutdown command from the unit supervisor, contact all posts to make

preparations for shutdown;

1.1.2 Do starting test of AC and DC lubricating oil pump, jacking oil pump and starting oil pump of

turbine and they are normal through test, and do starting test of the steam turbine turning gear

motor and it is normal through test;

1.1.3 Switch the auxiliary steam supply to be supplied by neighboring turbine (or supplied by

starting boiler);

1.1.4 Check the unit thoroughly and count detects of equipment.

1.2 Normal shutdown

1.2.1 Confirm DEH is in Operator Auto mode; confirm lower limit of initial steam pressure is

released.

1.2.2 Open the sub-picture of set value control on the main control picture of DEH to set the

target load at 110MW, and set the load down rate at 1.25MW//min by turning down the governing

valve in the condition of holding steam temperature and pressure, then press the button GO to

make the unit load start to decrease. At the same time, the main operator shall decrease the

temperature and pressure according to normal shutdown curve.


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GO button, the unit load continues to decrease.

1.2.7 When the differential pressure between HP heater #2 steam side and deaerator is 0.06Mpa, switch it to the cleaning side. The lubricating oil shall

keep on circulating until the strainer of filter is clean;

8.2.2.6 Check if the water level of the deaerator is normal, the temperature is > 50C, the feed

water pump has a temperature difference between its upper and bottom pump body is lower than

20C;

8.2.2.7 The sealing water system works normally and loop is smooth; Check if the pressure after

the sealing water governing valve is the ring is 0.05~0.1Mpa higher than the unloading water

pressure;

8.2.2.8 Check if all transmission contacts of hydraulic coupling speed governing mechanism are

firm transmitting reliably, and the handle is flexible, after it is normal through hand operation, set

the scoop tube at 0 position;

8.2.2.9 Power on the feed water pump motor after it is qualified through insulation test and it is

permitted to close the switch;

8 2 2 10 Cl th t di h l f th f d t b d



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8.3 Start-up of feed water pump set

8.3.1 All equipment of t feed water pump set and valves of pipe are checked and verified as

normal;

8.3.2 Confirm the inlet valve of booster pump is fully opened and the water discharge valve has

been closed;

8.3.3 Verify the feed water pump motor-operated outlet valve and the center tap valve is closed,

the recirculation valve of feed water pump is opened;

8.3.4 Verify the scoop tube of the hydraulic coupling is in the maximum position;

8.3.5 Verify when the auxiliary oil pump is working, the lubricating oil pressure is more than

017Mpa;

8.3.6 Click the Start button of feed water pump and record the constant speeds time; if no-load

current is normal, then start the feed water outlet electric value;

8.3.7 After feed water pump starting, check the sound and vibration, etc. of the feed water pump

and booster pump that are normal;

8.3.8 When the lubricating oil header pressure is > 0.22MPa, the auxiliary oil pump shall stop

automatically;

8.3.9 Put the oil-cooler of motor into operation;

8 3 10 P t th il l d l b i ti il l i t ti di t th il t t


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8.5.1 Put the HP protective water source into operation;

8.5.2 Verify the inlet and outlet four-way value of HP heater are closed, feed water runs along the

bypass, the water filler valve is closed tightly and open the steam discharge valve on the water

side of HP heater;

8.5.3 Open the primary and secondary oil filler valve of HP heater to fill HP heater with water,

after there is water overflowing the air valve, close the air release valve on the water side of HP

heater, after the internal pressure of HP heater becomes equal to the feed water pressure, check

the HP heater four-way valve that shall open automatically, close the water filler valve, check that

there is no water level on the steam side of HP heater and verify no leak in HP heater;

8.5.5 Open the drain valves before and after the steam extraction section 1 and 2 check valve to

warm up the pipe;

8.5.6 Open the water discharge valve at the bottom of HP heater1 & 2 HP heater, as well as the

air release valve on the top;

8.5.7 Open the check valves of steam extraction section 1 and 2;

8.5.8 Open the air inlet motor-operated valves of HP heater 1 & 2, maintain the HP heater

pressure within 0.05~0.1Mpa for warming, after there is steam coming from the air valve of HP

heater, close the air release valve of HP heater, and close the drain valves before and after the

t t ti ti 1 d 2 h k l


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deaerator. It may open the heating & steam inlet at the bottom if necessary to adjust the oxygen

content to qualified;

d. Check the indication of the pressure gauge, thermometer and water level gauge of deaerator

on schedule, if any abnormality, it shall report for treatment in time;

e. If the water level decreases because of improper adjustment of water level or the condensate

pumps insufficient output, it shall take some measures to make up water timely. But pay attention

to that: Dont hurry, it may affect the pressure of deaerator and cause vibration. It may lower the

unit load if necessary;

f. If the water level still keeps on decreasing measures, it report to the unit supervisor. If

emergency water level occurs to affect normal operation of feed water pump and cause fault

hereof, it shall lower the load to shut down the unit;

g. Check the running condition of the safety valve of deaerator in operation regularly, when

deaerator is overpressed, pop the safety valve in order to ensure normal operation of deaerator.

8.10.2 Check & maintenance of feed water pump

a. Check if the feed water pump set has any friction and leak, vibration is normal and no

abnormal sound.

b. The oil level of oil tank and bearing is normal and the auxiliary oil pump is in good and standby

t t



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safety;

b. Water lever of HP heater rises, treatment takes no effect and water level gauge is on the

utmost;

c. When water level gauge burst and can not keep on working;

d. The HP heater proper leaks seriously and cannot keep on working.

8.11.1.2 Treatment of t HP heater overfeed with water

Phenomenon:

a. Alarm for high water level of HP heater;

b. Protection may operate;

c. The HP heater outlet water temperature is low, and the heater vibrates.

Treatment:

a. When HP heater water level is high, check if the HP heater drain system operates normally,

when the drain governing valve is jammed, it shall open the emergency drain valve to lower the

water level, and contact with the maintenance personnel for treatment;

b. The running HP heater leaks and the water level rises to 850mm/1,125mm (HP heater1/ HP

heater2) sharply, the water level high value I alarm is raised;

c. If the HP heater water level rises to 1,000mm /1,275mm (HP heater1/ HP heater2), the

t l l hi h l II l i i d t d i l t ti ll


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e. Record the idle time and vibration value of the faulted pump;

f. Complete other operations of pump stop, and take necessary safety measures as the fault may

be;

g. Report to the unit supervisor if there is no standby pump to shut down the unit for emergency.

8.11.3.4 Tripping off of feed water pump

Phenomenon:

a. The service pumps current reaches 0, the pump stops, emergency alarm is raised and feed

water pressure swings or decreases;

b. The standby pump interlock starts.

Cause:

a. Fault in the 6.6 KV busbar;

b. Protections of feed water pump and motor operate or are operated by mistake;

c. Misoperation made by man;

d. The emergency button is pressed by mistake.

Treatment:

a. Check and close the outlet motor-operated valve and center tap valve of the tripped-off pump,

check the auxiliary oil pump of the tripped-off pump that shall interlock to stop automatically;

b If th t db d t t t t t it i di t l if t db th t db



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operating, for which the operation and treatment are not timely;

d. The inlet valve of booster pump is closed by mistake in operation.

Treatment:

a. Treat as per the requirements of emergency stop of pump;

b. Find out the causes for vaporization in feed water pump, and eliminate the abnormity;

c. If the vaporization is caused by inlet strainers of booster pump and feed water pump being

blocked, it shall start the standby pump immediately;

d. Only when the inlet pressure and deaerator pressure and water level become normal can it

restart the pump or put the standby into operation.

8.11.3.6 Feed water pressure decrease

Cause:

a. Fault in the hydraulic coupling or the scoop tube is jammed;

b. Water quantity used by the boiler increases greatly suddenly;

c. Water pipe breaks or HP heater leaks seriously;

d. The outlet check valve of standby pump is not closed tightly and the pump reverses;

e. The system valve is operated by mistake;

f. The service feed water pump is vaporized;

Wh th f d t fl i 280t/h th i l ti l f i f d t i t



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b. The feed water pump operates at a certain speed, which cant satisfy the requirement of the

boiler or the rotating speed decreases.

Treatment:

a. Move the scoop tube locally to make it return to normal;

b. If moving the scoop tube locally is useless, it shall stop the faulted pump and start the standby

pump in time;

c. Contact the maintenance personnel, it must not restart or put the standby into operation until

eliminating the defect.

Chapter 9 DEH System

9.1 General statement of DEH system

DEH-steam turbine digital electric hydraulic control system adopts the I/A hardware manufactured

by FOXBORO company and uses HP fire resistant oil as its hydraulic pressure part, and the

governing valve is directly controlled by DEC with electro-hydraulic converter.

9.2 Structure of DEH System

With the operation of OPC solenoid valve and OPC oil way, HP oil system can realize overspeed

t ti d ith th ti f di h l d f t il i t f it li l



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Steam turbine in the state of tripping;

Starting oil pump and EH oil pump operate normally and oil pressure is normal;

Manual shutdown is on the Reset position;

9.5 DEH Control and Operation

9.5.1 Automatic control mode (OA)

Operator can perform reset by clicking the button Reset on manual operation panel, and after

steam turbine is reset, main control panel will display Latched.

Click button control mode on top left of main control panel, and then sub picture of control mode

will pop up, here can select a control mode for application. Click the button OPERATOR AUTO,

afterwards click button Put-in within 3S, then auto control mode (OA) is put in, meanwhile, main

panel displays equipment being in OPERATOR AUTO mode.

Operator click the button Limit Value on lower left of main control panel to pop up the sub

window, then input valve position limit value, thereupon valve position limit will rising ceaselessly

up to valve position limit value.

Click button Control Set Value to pop up sub picture, input the target speed (0~3,000rpm/min)

into target value bar and the speed (0~500rpm/min) in Speed bar, afterwards click buttons

ENTER d GO th th t l ill i t t t t ti d di t th t


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limit, afterwards click button Put-in within 3S, and then control will enter to TPL mode,

meanwhile the main panel will display the main steam pressure limit is IN

In the case of TPL mode, as initial steam pressure being lower than 90% rated pressure, load set

value will decrease at a fixed rate. Shut down the control valve hydraulic servomotor can

compensate the decrease of main steam, thus avoid initial steam pressure decrease being to

large.

TPL mode also can be cleared on limit at sub picture: click the button initial steam pressure

restriction, afterwards click button Clear within 3S, and then control will disengage from TPL

mode.

9.5.6 Remote control initial steam pressure limit (RTPL)

In OA operation, and the initial steam pressure is larger than 90% rated pressure, operator can

select the RTPL (Remote control initial steam pressure limit) mode: operator shall press the limit

value on lower left of the main control panel to pop up the sub picture, then click button Remote

control initial steam pressure limit, afterwards click button Put-in within 3S, and then control will

enter the RTPL mode, meanwhile, the main panel will display the Remote control initial steam

pressure limit being IN

In RTPL mode, and the initial steam pressure is lower than 90% rated pressure, load set value

ill d t fi d t Sh t d th t l l h d li t t



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click button GO, here valve limit value will enter the DEH control logic. In case of valve position

limit mode, valve command will not exceed the valve position limit value.

9.5.9 Single valve/ sequence valve (SIG/SEQ) mode

In case of OA operation, operator also can select SIGLE (single valve) or SEQ (sequence valve)

operation mode: click the button valve mode on milled lower part of main control panel to pop

up he side picture, click single valve (or sequence valve) and the two switching buttons (press

switching button within 3S after clicking single valve button, and it will be effective if the two

buttons being red synchronously.

In SIGLE mode, command of all the control valves is the same and all the control valves take part

in control synchronously; in SEQ mode, four control valves will operate one after another

according to a certain sequence. The switching time between two modes is about 3S so as to

guarantee no disturbance of load in the whole switching process.

9.5.10 OPC mode (OPC MODE)

Moreover, there is OPC (overspeed protection control) function set in DEH, in case load of steam

turbine is over 30%, and main oil switch of motor trips, at that time, with the function of solenoid

valve, all the hydraulic servomotors of control valve will control oil pressure to unload, thereby

closing all hydraulic servomotors of governing steams. With the quick close of hydraulic

t t ti d l ti ill b t i d d if t t bi t ti d i



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In TM mode, OPC function remains, once OPC operate, it still will close all steam governing

valves.

9.6 Stimulation Test of DEH

DEH has a built-in simulator that can perform closed-loop simulation test to DEH when the

turbine is in the state of rest.

It can stimulate control signals such as latching, synchronization, paralleling in and remote control

signal, etc. to carry static test to verify the signals or functions and ensure the smoothness of

impulsing.

Attention: this test can only be done by related personnel during outage and is forbidden in

normal operation of turbine. After the test is finished, all the original parameter must be restored,

otherwise a serious result may be caused; it is recommended to do this test in the engineer

station.

Chapter 10 Bypass System

10.1 Function of bypass system

10.1.1 Because of improving cold, warm and hot start conditions of unit that greatly reduces the

unit start-up time and makes unit operate with full load in advance, the bypass system is suitable

f th it HP li d i l i HP & MP &LP li d bi d t t


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Chapter 11 Turbine Proper Water Drain System

11.1 In order not to let the drain flow inversely, all drains are connected and arranged on the drain



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11.3 The turbine proper part includes the following drains:

11.3.1 Drain of cold and hot section of the initial and reheat steam pipes;

11.3.2 Drain of HP air duct;

11.3.3 Drain of MP air duct;

11.3.4 Drain of HP cylinder jacket;

11.3.5 Drain of valve level steam leakage;

11.3.6 Drain before and after HP exhaust check valve and extraction check valve.

Chapter 12 Quick Cooling System of Steam Turbine

12 1 P ti i t ti



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12.1.9 Verify the air compressor and service air system are put into operation and operating

normally.

12.1.10 The manhole on the steam side of condenser steam side is opened. Check if the drain

valve before HP exhaust check valve is opened.

12.1.11 Only when the cylinder temperature decreases to below 350, it can put the quick

cooling equipment into operation.

12.2 Monitoring of parameters in quick cooling process:

In order to ensure the mental temperature inside the turbine can decrease evenly in the processof quick-cooling after turbine shutdown so as to prevent overstress due to excessive cooling,

rotor from bending and cylinder and welded junction from deforming, it must strictly monitor the

changes in each point temperature, temperature difference between cylinder inner and outer wall,

temperature difference between upper and lower cylinder, absolute expansion, differential

expansion, axial deflection, rotor eccentricity, turning gear current, compressed air temperature

and flow and electric heater current in the process of putting the quick cooling equipment of

turbine into operation. The monitor control index of main parameters includes:

12.2.1 First stage metal temperature decreasing rate of HP cylinder is


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rise again obviously, it may end the forced ventilation. Close the air inlet valve and keep on

turning for 30min to see if the temperature of all points rises again, if not, it may stop turning to

start servicing.

12.3 Put-in of quick cooling equipment of turbine:

12.3.1 Put the LP cylinder spray of main machine into operation normally.

12.3.2 Slightly open the blowdown valve of oil-water separator and the drain valve of the gas

collection tank.

12.3.3 Open the total valve of compressed air.12.3.4 Put the heater into operation.

12.3.5 Open wide the primary valve and adjust the air inlet flow of secondary valve as putting the

quick cooling equipment into operation. Slowly open the hand-operated air inlet valve of

compressed air to HP & LP drain pipe.

12.3.6 Open gradually the air inlet valve wider and set the outlet temperature of air heater

according to the decreasing of cylinders temperature, and control the temperature decreasing

rate not exceed 5 /h.

12.3.7 Check if the exhaust temperature that shall not exceed 80 .

12.3.8 In the process of put-in, check if the temperature difference between upper and lower

li d th t h ll t b th 41


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than 130 .

12.4.12 When air temperature exceeds the deviation or the electric heater loses power, it shall

raise the alarm and interlock close the inlet valve to prevent cold air from entering and cooling the

cylinder excessively, meanwhile cut off the power supply of heater to prevent the heater from dry

heating.

12.5 Stop of quick cooling system

After finishing quick cooling, adjust the potentiometer to 0 point manually, stop the heater, open

the power supply switch and continue to ventilate for 5~10 minutes, then close all valves. Slightlyopen of the blowdown valve to prevent air leak of air inlet valve from resulting in water entering

the equipment.

Chapter 13 Inner Cooling Water System



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Model: DFB100-80-230 Model: Y200L1-2

Flow: 70 m3/h Power: 30 kW

Pump lift: 70m Voltage: 415 V

Rotating speed: 2,900 r/min Current: A

Rotating speed: 2,900 r/min

Insulation grade: F

13.2 Start of inner cooling water pump

13.2.1 Check if the oil level of bearing is normal, if turning coupling is flexible, if the water in the

cooling water tank is qualified and water level is normal.

13.2.2Check if all parts of the inner cooling water pump are normal, each valve is on right

position, inlet and outlet are opened and the air release valve is opened and close it after

discharging air thoroughly.13.2.3 Release the interlock of inner water cooling pump.

13.2.4 Start the inner cooling water pump and check if the vibration, current, pressure and sound

are normal, Glan throw no water and water discharge is smooth.

13.2.5 Put the interlocking switch into operation.



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13.4.1.6 Slowly open the cooling water outlet valve of water cooler, pay attention to the change in

water inlet and outlet temperature and pressure of inner cooling water, adjust the opening extent

of cooling water outlet valve to keep the temperature of inner cooling water normal. In normal

condition, two water coolers are in operation, one is for standby.

13.4.2 Stop of water cooler

13.4.2.1 In operation, pay attention to that water level of cooling water tank shall be normal, each

water inlet pressure and temperature of the generator shall be normal.

13.4.2.2 Slowly close the inner cooling water outlet valve of water cooler and pay attention to thateach water inlet pressure and temperature of the generator shall be normal.

13.4.2.3 When it is to stop isolation, first close the cooling water inlet & outlet valve of the water

cooler, then close the inlet valve of inner cooling water to reduce the pressure and discharge

water.



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water of winding

Differential pressure of

the filter is high

actual

measure

ment

20kPa higher than

normal value

Air inlet temperature of generator: normal 20~40 , 45 max;

Air outlet temperature of generator:


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Appendix Part



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0.008 41.534 0.17 115.17 0.41 144.52 2.4 221.78 9.0 303.21

0.009 43.787 0.18 116.93 0.42 145.39 2.5 223.94 9.5 307.21

0.01 45.833 0.19 118.62 0.43 146.25 2.6 226.04 10.0 310.96

0.011 47.71 0.20 120.23 0.44 147.09 2.7 228.07 11 318.05

0.012 49.446 0.21 121.78 0.45 147.84 2.8 230.05 12 324.65

0.013 51.062 0.22 123.27 0.5 151.84 2.9 231.97 13 330.83

0.014 52.574 0.23 124.71 0.6 158.84 3.0 233.84 14 336.64

0.015 53.997 0.24 126.09 0.7 164.96 3.2 237.45 15 342.13

0.02 60.86 0.25 127.43 0.8 170.41 3.4 240.88 16 347.33

0.025 64.992 0.26 128.73 0.9 175.36 3.6 244.16 17 352.26

0.03 69.124 0.27 129.98 1.0 179.88 3.8 247.31 18 356.96

0.04 75.886 0.28 131.20 1.1 184.07 4.0 250.33 19 361.43

0.05 81.345 0.29 132.39 1.2 187.96 4.2 253.24 20 365.70

0 06 85 945 0 30 133 54 1 3 191 61 4 4 256 05


Appendix 2: Cold Start Curve


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- 151 -

Fig.14 Cold Start Curve of 135MW Unit (D151)


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Appendix 4: Normal Shutdown Curve


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- 153 -


Appendix 5: Shutdown Curve at Sliding Parameters


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Fig.16 Shut Curve at Sliding Parameters of 135MW Unit (D151)

Speed

Initialsteamtemp.

Lower carriersteam temp.

Reheatsteam temp.

turbine mannual

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