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TURBINE OPERATION RULES
VSLP 1135MW POWER PLANT RAJASTHAN PROJEDCT
Client: SEPCO ELECTRIC POWER CONSTRUCTION CORPORATION
No.26-W9-YX-01TURBINE OPERATION RULES (A)Total 151 Pages
Operation Instruction
SEPCOIII
Drafted by: Reviewed by: Approved by:
Name of Change SheetNo.Time of Approval
1
2
3
CONTENTSPART 1 OverviewChapter 1 Specification of Main Equipment 5Chapter 2 Specification of Auxiliary Equipment 14PART 2 Unit Start-upChapter 1 Cold Start of the Unit .26Chapter 2 Warm & Hot Start of the Unit ...38PART 3 Unit Operation Chapter 1 Operating Parameters of Steam Turbine 42Chapter 2 Operating Modes of the Unit ....47Chapter 3 Regular Works and Requirements ..49PART 4 Unit Shutdown
PART 5 Treatment of Unit AccidentsChapter 1 Treating Rules of Accidents ..60Chapter 2 Condition of Steam Turbine Tripping ...61Chapter 3 Condition of Unit Fault Shutdown 61Chapter 4 Condition of Emergency Shutdown..62Chapter 5 Procedure of Emergency Shutdown....63Chapter 6 Procedure of Unit Fault Shutdown ..63Chapter 7 Decreasing of Vacuum ..64Chapter 8 Water Hammer of Steam Turbine 65Chapter 9 Increasing of Axial Displacement ....66Chapter 10 Steam Turbine Oil System Catching Fire ....67Chapter 11 Abnormity of Steam Conditions .68
Chapter 12 DEH Failure .71Chapter 13 Abnormity of Steam Turbine Lubricating Oil System 71
Chapter 14 Abnormal Vibration of the Unit .75Chapter 15 Generator parallels off, while turbine does not trip ...77Chapter 16 Generator parallels off, and turbine trips 77Chapter 17 Turbine trips, while the generator does not parallel off 78Chapter 18 Failure of Thermodynamic Power Supply 78Chapter 19 High Bearing Temperature of Turbine-generator Unit 79Chapter 20 Burning out of Turbine-generator Bearing Bush .79Chapter 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.83Chapter 24 Turbine-generator unit operates at abnormal frequency 83Chapter 25 Boiler Fire Extinction 84Chapter 26 Treatment of Accidents & Abnormity of the Motor ..85PART 6 Auxiliary Equipment & Common Service SystemChapter 1 General Operating Rules of Auxiliary Equipment.. 89Chapter 2 Industrial Water System.92Chapter 3 Oil Purification System of Steam Turbine94Chapter 4 Lubricating Oil System of Steam Turbine 98Chapter 5 Circulating Water System ...102Chapter 6 Shaft Sealing and Vacuum System of Steam Turbine ...108Chapter 7 Condensate Water System ....111Chapter 8 Feed Water Deaerating System ...117Chapter 9 DEH System ....131Chapter 10 Bypass System ..136Chapter 11 Turbine Proper Water Drain System ..138Chapter 12 Quick Cooling System of Steam Turbine ..139Chapter 13Air Cooling System ..143Appendix 1: Comparison Table of the Temperature & Pressure of Saturated Water & Steam .......147PART 1: OverviewChapter 1 Specification of Main Equipment
1.1 Specification of steam turbine equipmentModel: N135-13.2/535/535Type: super-high pressure, primary reheating, double cylinder, double-flow, single shaft, extraction and condensing steam.
Rated power: 135MW
Initial steam pressure: 13.24Mpa (a)Initial steam temperature: 535Reheat steam temperature: 535Exhaust pressure: 5.4kPa (a)Rated speed: 3,000r/min
Rotating direction: clockwise (as viewed from the governor side to generator)
Manufactured by: Shanghai Turbine Co., Ltd.1.2 Main technique parametersMax power:
146.822MW
Rated power:
135MWRated pressure of the steam before initial steam stop valve: 13.24Mpa (a)=132 kg/cm2Rated temperature of the steam before initial steam stop valve: 535 CRated pressure of the steam before reheat steam valve: 2.238 Mpa (a)Rated temperature of the steam before reheat steam valve: 535Rated cooling water temperature: 24Rated backpressure:5.4kpa (a)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: 660mm
Critical speed of shafting: 1850r/min for HP & MP rotor
2116r/min for LP rotor1290r/min for generator rotor
Stages of flow path: total 39 stages: HP cylinder: 1 governing stage + 8 pressure stagesMP cylinder: 10pressure stagesLP cylinder: 26 pressure stages1.3 Description of turbine characteristics1.3.1 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 about 15 mins.
1.3.5 This units blades can run safely at the grid frequency of 47.5~51.5hz for long; the units characteristics also meet the requirements as follows:Frequency (Hz)Permitted Operating Time
Accumulated (min)Every Time (Sec)
52.5>5>5
52.0>30>30
47.5~51.5Continuous Operation
47>60>60
46.5>10>10
46>2>2
1.3.6 The peak to peak vibration amplitude measured near the bearing journal of turbine shall be 0.075mm during normal operation, which shall not exceed 0.25mm as critical speed passing in speed rise;1.3.7 The power load of the unit is permitted to reach 135MW when the HP heaters are cleared;1.3.8 The unit is permitted to run continuously with low load when the exhaust pressure of turbine increases to 0.0146Mpa (a). The alarm back pressure of turbine is 16.9kPa (a) and trip back pressure is 20.3kPa (a).
1.3.9 The unit is permitted to run for long when the exhaust temperature of steam turbine is less than 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%/min1.3.10.3 Below 20%MCR
2%/min1.3.11 The pressure after the governing stage must not exceed 10.34Mpa (a) at different working conditions.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, generator rotor expands and contracts forwards and backwards with the thrusting bearing in middle bearing pedestal as the dead point, and HP & MP cylinder expands forwards based on the cross point of longitudinal and traverse key of the middle bearing pedestal. There is an absolute expansion indicator on the front bearing frame with total cylinder expansion of 20-22mm. and the LP outer cylinder expands backward with the cross point of the longitudinal and traverse key in the front of the LP outer cylinder as the dead point.
The turbine unit is 14 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 inlets respectively, and governing valve controlled by oil servo-motor.
The high pressure nozzle section consists of four groups of nozzle segments, 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 double-floor cylinder with 1 governing stage and 8 pressure stages in the HP part. There is a section of steam extraction led to HP heater #1 after stage 7, 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. There are 10 pressure stages in MP part with a third stage extraction to deaerator after stage6 and a fourth extraction led to LP heater #4 after stage 8. For MP exhaust part, the upper half is designed to exhaust steam upwards that flows into LP cylinder through 2 flexible cross over pipes with compensation capacity; the lower half has a fifth extraction led to LP heater #5.
The LP cylinder is double flow and has 26 stages, there are a 6th and 7th extraction openings set in LP cylinder that lead extraction to LP heater #6 and LP heater #7 (built-in type) inside the condenser respectively and led out after the stage 3 and stage 6 respectively.This steam turbine has three bearing pedestals in all, in which 3 turbine journal bearings, 1 generator front bearing and 1 thrust bearing are mounted. All bearing pedestals are floor mounted. Besides journal bearing in bearing pedestal #1, there are also main governing set, including main oil pump and emergency governor etc.Two MP combined valves are arranged on the left and right side in the middle of the unit respectively, which may move freely on its bearing surface with expansion of the turbine, the MP governing valve only operates for regulation at below 30% load and opens fully not to take part in regulation in the case where the load is more than 30%.The rotary equipment of steam turbine rotor is mounted on the back bearing pedestal and driven by motor after speed reduction, rotor turning gear speed rotation is 7~8r/min, each bearing is equipped with HP jacking oil system in order to lower the start-up power of rotary equipment and protect all bearings from damage.LP cylinder is equipped with atomizing nozzle type low-load spray regulator inside that may operate 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.1.4.1.2 Sliding key systemThe 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 exhaust hood 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.1.4.1.3 Thrust bearingThe 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 erection loop, and erection loop leans against the spheric seating, which gives self alignment effect. Positive or negative thrust of steam turbine bearing operates on the operating pad or non-operating pad separately, and the bearing displacement on thrust pad shall not be more than 0.4mm. The lubricating oil enters between thrust collar and thrust pad via oil inlets on both sides for lubricating, and then flows out from thrust collar outer side, the return oil escapes from the top, and there are two return oil adjusting screws mounted on return oil outlet, which can adjust the oil return quantity to control return oil temperature.1.4.1.4 Journal bearingThis unit adopts elliptic type journal bearing, which consists of a bearing bush cast with Babbitt metal, bearing shell and spheric seating. The bearing is made into upper and lower, two halves that are fixed and positioned by screws and taper pins, the bearing case matches with spheric seating on spherical surface, which gives self alignment effect, and there are four set pieces on the spheric seating for the use of adjustment. Lubricating oil flows into bearing through a hole at lower part of bearing and then flows into bearing pedestal via the bearing end. There is a platinum resistor mounted on the bearing bush that can measure the bearing metal temperature, there is oil from return chute in the bore of locating pin in upper bearing half, which temperature can be measured as that of bearing return oil, and there is HP jacking oil hold at the bottom of bearing bush.1.4.1.5 Shafting
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 high strength, 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 system1.4.2.1 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 other units.1.4.2.3 The governing system is able to control and guarantee the need of steam turbine incorporating into network and adaptation to changes in speed and load.1.4.2.4 For this unit operating at rated steam conditions and rated speed, the governing system is able to control the turbine speed not to result in the trip of emergency governor as the unit rejects load.1.4.3 Technical specifications of steam turbine control system
1.4.3.1 This unit has three sets of governors: Emergency governor handle to be tripped by operator manually for emergency;Mechanical emergency governor to trip at overspeed; Four governor solenoid valves controlled by ETS, which receive the governing signal of important parameters of steam turbine.1.4.3.2 System function:1.4.3.2.1 Governing function: The governor valve will trip to shut down the turbine for emergency trip as the following parameter exceeds the specified value.a. Speed rises to 110% of rated speed;b. Axial displacement exceeds 1.2mm;c. HP & MP cylinder differential expansion exceeds +8.0 or -3.0mm;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 function1.4.3.2.4 Steam turbine reset function
1.5 Heat calculation data of the steam turbine NameUnitRated conditions THATMCRVWOCutting off all HP Heaters
Generator end power kW135,029135,101145,005135,043
Total steam inlet flow of steam turbinet/h407.502410.107440.000368.560
Initial steam pressure /temperatureMPa/13.24/53513.24/53513.24/53513.24/535
HP cylinder exhaust pressure MPa2.5332.5342.7242.677
HP cylinder exhaust temperature312.1311.9317.8321.6
Reheat steam flow t/h335.397335.701360.968354.820
Reheat steam pressure /temperatureMPa/2.33/5372.332/5372.506/5372.463/537
Back pressurekPa5.45.45.45.4
Cooling water temperature32.132.132.132.1
Feed water temperature 244.4244.5248.8171.4
Make-up water flowkg/h0300
Flow into condensert/h284.081282.090303.577298.143
Heat ratekJ/kWh8,402.98,363.98,355.98,630.8
Steam ratekg/kWh3.0183.0363.0342.729
No.1 extraction steam condition MPa/3.552/354.93.56/354.93.832/361.4
No.1 extraction flowt/h22.1423.05124.681
No.2 extraction steam conditionMPa/2.457/312.32.458/312.12.642/317.9
No.2 extraction flowt/h36.87138.25140.589
No.3 extraction steam conditionMPa/0.73/377.90.729/377.60.784/377.50.769/377.1
No.3 extraction flowt/h8.0668.479.1249.863
No.4 extraction steam conditionMPa/0.451/315.80.45/315.40.484/315.30.475/315
No.4 extraction flowt/h13.06413.5714.33514.003
No.5 extraction steam conditionMPa/0.251/248.40.25/247.80.269/247.80.264/247.5
No.5 extraction flowt/h22.09722.91224.14823.568
No.6 extraction steam conditionMPa0.0670.06650.07180.0705
No.6 extraction flowt/h15.80116.33517.15316.775
No.7 extraction steam conditionMPa0.01430.01420.01520.015
No.7 extraction flowt/h2.9052.953.9773.621
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 5.4kP, make-up water percentage is 0%, and regenerative system is put into operation all normally and generators efficiency is 98.4, 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 5.4kP, make-up water percentage is 3%, and regenerative system is put into operation all normally and generators efficiency is 98.4.Valve Wide Open condition (VWO): means the condition in which the turbines steam inlet flow is 440t/h when the turbines governing valves are wide open and the other conditions is the same with 2.1.1, which output value is 145.822MW. This condition corresponds to the Boiler Maximum Continue Rate (BMCR).
Chapter 2 Specification of Auxiliary Equipment2.1 Specification of heater
2.1.1 Specification of HP heaterItemUnitHP heater #2 HP heater #1
ModelJG-530-2-00CKJG-530-1-00CK
Design pressure of shell sideMpa3.04.5
Design temperature of shell side350/250390/260
Design pressure of tube sideMpa2020
Design temperature of tube side250260
Feed-water Inlet temperature172.2223.9
Feed-water outlet temperature 223.9248.8
Working pressureMpaTube side 18Shell side 2.64Tube side 18Shell side 3.8318
Working temperatureShell side 317.9/180Shell side 361.4/247.8
ManufacturerQingdao Qingli Boiler Auxiliary Equipment Co., Ltd.
2.1.2 Specification of LP heaterItemUnitLP heater #7LP heater # 6LP heater # 5LP heater # 4
ModelJD-220-1-1JD-300-1-3JD-300-1-2JD-300-1-1
Heating surface area M2200300300300
Design pressure of tube side Mpa2.52.52.52.5
Design temperature of tube side100100150180
Design pressure of shell sideMpa0.050.40.40.5
Design temperature of tube side100100260350
Working pressure of tube sideMpa1.7241.7241.7241.724
Working pressure of shell sideMpa0.01520.072570.26930.454
Working temperature of tube side5569.45109.05138.25
Working temperature of shell side5590.63129.9150.6
Manufacturer Shanghai Power Equipment Co., Ltd.
2.1.3 Specification of deaerator and deaerated water tank
2.1.3.1 Specification of deaerator
ClassClass ITest pressure1.374MPa
Model GC-514Pressure drop of nozzle 0.0588MPa
Design pressure0.88Mpa (g)Opening pressure of safety valve0.85MPa
Design temperature 380Operating modeSliding pressure operation
Max working pressure0.78Mpa (a)Corrosion allowance (tank /deaerator)1.6/2.5mm
Rated output514t/hOxygen content of outlet water 7PPb
Inlet water temperature147Outlet water temperature169.3
ManufacturerQingdao Qingli Boiler Auxiliary Equipment Co., Ltd.
2.1.3.2 Specification of dearated water tank
ClassClass IOpening pressure of safety valve0.85MPa
TypeGS-120Test pressure1.374MPa
Design pressure0.88Mpa (g)Effective volume120m3
Design temperature380Total volume140m3
Max working pressure0.68MPaCorrosion allowance (tank /deaerator)1.6/2.5mm
ManufacturerQingdao Qingli Boiler Auxiliary Equipment Ltd.
2.2 Specification of feed-water pump
2.2.1 Feed-water pump and booster pump
Equipment parameterUnitFeed-water pumpBooster pump
ModelFK5G32QG500-80
Number of stagesstage51
Inlet water flowm3/h533.3533.3
Outlet water flowm3/h497.8533.3
Liftm1771.979.6
Inlet water pressureMPa1.480.6837
Outlet water pressureMPa19.181.48
Shaft powerkW2733.9128.7
Rotating speedr/min46862982
Working temperature166.7166.7
Medium density kg/m3900.59900.59
Intermediate bleed-off pressure (stage 2)MPa8
Intermediate bleed-off flowm3/h35.5
Guarantee efficiency%81.3280.84
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
ItemUnitSpecification
ModelYKOS3700-2
Rated powerkW3,700
Rated voltageV6,600
Rated currentA370
Rated speedr/min2,982
Rated frequencyHz50
Connection type of statorY
Insulation classClassF
Power factor COS0.9
Cooling modeAir-cooled
Temperature rise80
ManufacturerShanghai Motor Co., Ltd.
2.2.2.2 Specification of air cooler of feed-water pump motor
ItemUnitSpecification
Capacity of coolerkW160
Operating water flowt/h60
Circuit of cooling waterGroup 2
Air pressure dropkPa0.32
Working water pressureMPa0.2-0.4
Max permitted water pressureMPa0.5
2.2.3 Specification of hydraulic coupling
2.2.3.1 Parameters of hydraulic coupling
ItemUnitSpecification
ModelR17K.2-E
Motor speedr/min2,986
Output speedr/min4,783
Max output powerkW3,000
Slip%3
Scope of speed governing%25-100
Efficiency%94.7
Capacity of oil tankm30.85
ManufacturerGermany VOITH
2.2.3.2 Auxiliary equipment of coupling
ItemUnitAuxiliary oil pumpWorking oil coolerLubricating oil cooler
ModelCB-B125LY54LY16
Oil flowm3/h7.53017
PressureMPa0.25
Cooling surface aream25416
Cooling water flowm3/h12027
2.3 Circulating water system
2.3.1 Specification of circulating water pump
Specification of circulating water pump (double pumps in parallel operation)Specification of circulating water pump motor
Model44LBXA-23ModelYLKK900-10
Shaft power770.3 kWVoltage 6,600V
Lift 23mCurrent 98A
Rotating speed 595 r/minPower 900kW
Flow10,728t/hPower factor 0.86
Efficiency 87.2%Rotating speed 595r/min
Cooling water of bearing90m3/h, 0.3MPa
Mini submergence3m
Manufactured byChangsha Water Pump WorksManufactured byShangyang Electric Machine Co., Ltd.
2.3.2 Automatic back washing strainerItemUnitSpecification
ModelASCS300
Working pressureMPa0.3
Max pressureMPa0.6
Inlet & outlet diametermm300
Manufactured byShanghai Power Equipment Research Institute
2.3.3 Circulating water booster pumpSpecification of circulating water booster pumpSpecification of circulating water booster pump motor
Model10Sh-9AModelY250M-4
Shaft power40 kWVoltage415 V
Lift30 mCurrent A
Rotating speed1,480r/minPower 55 kW
Flow 420 t/hPower factor
Efficiency80%Rotating speed 1,480 r/min
Manufactured byShijiazhuang Kingda Pump Co, Ltd.Manufactured byXian Motor Works
2.3.4 Indoor circulating sump pit blowdown pumpSpecification of indoor circulating sump pit blowdown pumpSpecification of indoor circulating sump pit blowdown pump motor
Model40PV-SPModelY112M-2
Shaft power3.1kWVoltage415V
Lift15mCurrent A
Rotating speed1,800 rpmPower4 kW
Flow 25t/hPower factor
Efficiency34%Rotating speed 2900 r/min
Manufactured byShijiazhuang Kingda Pump Co., Ltd.Manufactured byXian Motor Works
2.3.5 Trash remover of circulating water pump houseSpecification of trash remover of circulating water pump houseSpecification of trash remover motor of circulating water pump house
ModelZSB-3500ModelBWD5-87-5.5
Water head in operation start300mm
Max design water head 600mmVoltage415V
Mesh size3.553 mmCurrent A
Travelling speed of scrubbing brush6~7 m/minPower5.5 kW
Total Number of scrubbing brush4 Power factor
Rotating speed of round brush20.33 r/minRotating speed 87 rpm
Manufactured byJiangsu Yihaun Group Co., Ltd.Manufactured by
2.4 Shaft seal system
2.4.1 Shaft seal
HP & MP seal ring are high & low-tooth labyrinth structure and LP seal ring is flat tooth structure; HP & MP cylinder diaphragm seal is embedded seal, the sealing strip is riveted into the 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
ItemUnitSpecification
ModelJQ-50-1
Heating surface aream250
Design flow of main condensate flowm3/hTotal flow, 300 minimum
Design pressureMPaTube side 3.1, shell side 0.1
Working pressureMPaTube side 2.00
Test pressureMPaTube side 3.9, shell side 0.125
Design temperatureTube side 100, shell side 100
Working temperatureTube side 60, shell side 100
Net weightt2.23
2.4.3 Shaft seal fan:Specification of shaft seal fanSpecification of the motor
ModelAZY-09.32-020.0-01Model132S
Full pressure9.32kPaPower7.5kW
Speed 2,900r/minSpeed2,900r/min
Flow20m3/minVoltage415V
Manufactured byZhejiang Yuyao Blower PlantManufactured byWannan Electric Machine Co., Ltd.
2.5 Condensate and steam extraction system
2.5.1 Specification of condenser
ModelN-9000Cooling water temperature32.5
TypeSingle shell, bisection, double passes and surface typeNumber of pass 2
Total active cooling surface area9,000 m2Velocity in cooling water pipe2m/s
Design pressure of tube side0.25MPaOuter diameter of cooling water pipe25mm
Design pressure of shell side0.1MPa/VacWater resistance of condenser