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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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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.4 extraction flow t/h 13.064 13.57 14.335 14.003
No.5 extraction steam condition MPa/ 0.251/248.4 0.25/247.8 0.269/247.8 0.264/247.5
No.5 extraction flow t/h 22.097 22.912 24.148 23.568
No.6 extraction steam condition MPa 0.067 0.0665 0.0718 0.0705
No.6 extraction flow t/h 15.801 16.335 17.153 16.775
No.7 extraction steam condition MPa 0.0143 0.0142 0.0152 0.015
No.7 extraction flow t/h 2.905 2.95 3.977 3.621
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
Item Unit Specification
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
Item Unit Specification
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;
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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
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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 -
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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.