Régimen aplicable en loa intercambios entre la Comunidad en su composición actual

2.4.1 Check before start

2.4.1.1 Maintenance of the unit is completed and all work permit tickets are concluded.

2.4.1.2 Ladders, fences and platforms are complete and there is no foreign materials in channels and around equipment disturbing work or passing.

2.4.1.3 Insulations of turbine proper should complete, all the connections in system should be complete and pipeline supporters and suspending devices are fixed.

2.4.1.4 Lighting in turbine hall is good and emergency lighting system works normally.

2.4.1.5 Communication system in turbine hall is normal.

2.4.1.6 Fire fighting water system is normal and fire fighting facilities are complete.

2.4.1.7 HP & IP main steam valve, governor valve and control actuator are normal.

2.4.1.8 Turbine sliding pin system is normal and cylinder proper can expand freely.

2.4.1.9 LP cylinder safety valve is complete and in fine condition.

2.4.1.10 Emergency oil discharging valve of main oil tank is closed and sealed with lead. Before start, all original parameters of turbine and main auxiliary equipments should be recorded.

2.4.2 Put auxiliary equipments and systems into operation before start

Put the following systems into operation according to check cards and relevant regulations in Unit Auxiliary Equipment Start and Stop and make sure that they are running normally. Balance of load distribution in all sections should be comprehensively considered.

2.4.2.1 Before boiler ignition, put the following systems into operation one by one and make sure that they are running normally.

1） Put fire fighting system into operation.

2） Put circulating water system into operation, condenser works normally.

3） Put opened circulating water system into operation.

4） Put closed circulating water system into operation, all coolers are filled with water and air is discharged. All valves state is right.

5） Put unit air compressor system into operation, air pressure is normal.

6） Put EH oil system into operation.

7） Put lubricate oil system into operation, one AC lubricate oil pump is running and the other one is in standby. DC lubricate oil pump in standby and all returning oil for bearings are normal.

Oil temperature can regulate itself. Water passes water side of oil cooler that is running; oil cooler in standby is isolated after filled with water.

8） Put the generator oil sealing system into operation, AC sealing oil pumps at air, hydrogen side of generator sealing oil are running, DC sealing oil pump is in standby, Water side of air and hydrogen side oil cooler is put into operation, all the oil pressure, oil temperature and oil levels in oil tanks are normal.

9） Generator changes hydrogen. Put hydrogen system into operation.

10） When the hydrogen pressure in generator is 0.2MPa, make sure that water in make up water tank is qualified and air in stator is completely discharged; put cooling water system in generator into operation. Adjust the differential pressure keep normal.

11） Start jacking oil pump, check and make sure that jacking oil supplying head pipe pressure, bearing jacking oil pressure are normal. Confirm the relevant interlocks of turning gear device are in fine condition and protection test is successfully completed; lubricate oil temperature should be higher than 21℃. Put turning gear into operation and check the turning gear current is normal. There is no abrasion sound at running parts and rotor eccentricity should be no bigger than 110% of original value. Record relevant parameters. Continuous turning gear time should be no less than 4 hours before starting the turbine.

12） Put condensing water system into operation.

a. Start make up water pump and fill water into condenser.

b. Make sure that protection tests of relevant interlocks of condensing water are successful, when the water level is normal, run the condensate pump, each LP-heater transit water .Air discharging and water filling at water side of LP heater are completed and water level protection has been put into operation.

c. Make sure that condenser and system flushing water are qualified and feed water to deaerator.

Make sure that flushing water in deaerator is qualified.

13） Auxiliary steam system drain and warming pipes, put it into operation, check the head pipe pressure and temperature are normal.

14） Put deaerator water tank for heating

a. Fill deaerator water tank to normal water level and contact chemical to dose to deaerator.

b Make sure that turning gear runs normally, open regulation valve from auxiliary steam to deaerator and put deaerator for heating. Regulate the pressure regulation valve from auxiliary steam to deaerator and make the water temperature rise according to boiler need.

（temperature-rise ratio not exceed 1.5℃/min）

15） Oil system of two (2) steam driven feeding water pumps are put into operation and, water passes through water side of running oil cooler; water side of standby oil cooler is isolated after air discharging and oil temperature regulation automation is in operation. Before boiler ignition, turning gear of feeding water pump should be running for more than three (3) hours.

16） Feeding water temperature reaches to the requirement of deeding water to boiler; run the electric feed pump transmit the feed water to boiler when water quality in deaerator is qualified. HP-heater connect water.

17） After water side of gland sealing heater putting into operation, put the turbine gland sealing system into operation.

a. Start one gland sealing heating air fan, open general valve from auxiliary steam to gland sealing steam head pipe and isolation valve heating pipes before and after gland sealing steam regulation valve.

b. After discharging all the drainage water, open gland sealing steam regulation valve and keep gland sealing steam pressure at 0.007～0.021MPa and LP gland sealing steam temperature at 120～180℃ and, LP gland sealing steam desuperheater water temperature control automation is in operation.

c. During unit start or stop, differential temperature between HP & IP rotor gland sealing steam temperature and rotor surface metal should <110℃.

Note: Steam supplying is prohibited when rotor is in stationary state. Turning gear operation should be strictly supervised during supplying gland sealing steam. Vacuum pump can only be started after gland sealing supplied to rotor to establish condenser vacuum.

18） Put gland sealing system of feed water pump turbine into operation.

19） Close the vacuum break-valve, open the sealing water valve, open the drain butterfly valve of feed pump turbine, start the vacuum pump,(according to the need decided how many pump run)

20） After establishing condenser vacuum, open drainage valves of turbine, feed pump turbine cylinder proper, main and reheat steam pipelines, extraction pipeline.

21） Make sure the all the works before starting are completed, equipments and systems in operation run normally and equipments and systems in standby can be put into operation at any moment.

2.4.2.2 Work after boiler ignition

1） After boiler ignition, inform the boiler about required parameters according to cylinder temperature.

2） Put bypass system into operation according to requirements. Put LP bypass system into operation first and then HP bypass system. Pressure before main steam valve should keep above 0.1MPa. Put HP & LP bypass attemperating water into operation according to temperature after bypass. Pay attention to vacuum and steam discharging temperature, contact with chemical to analyze condensing water quality.

3） Following parameters should be recorded before starting turbine: temperature and pressure of main and reheat steam, rotor eccentricity, absolute expansion, differential expanse, axial displacement, temperature of cylinder metal, vacuum, drain steam temperature, turning gear current, oil level of lube oil tank, lube oil pressure and temperature, jacking oil

pressure ,hydrogen side sealing oil tank oil level, hydrogen pressure, hydrogen-oil differential pressure, stator cooling water flow and pressure, oil level of EH oil tank, EH oil pressure and temperature.

2.4.3 Turbine start

2.4.3.1 Check and preparation before starting turbine 1） Interlock protection test of turbine is qualified and in operation

2） Auxiliary equipments and systems run normally and there is no condition prohibiting unit start.

3） When turbine is in cold state start, steam temperature at inlet of main steam valve at least should be with overheating temperature of 56℃ but no higher than 430℃. Main steam valve inlet steam temperature and pressure should be within curve of „Main steam parameters during start.

4） Turning gear device runs normally, rotor eccentricity ＜0.075mm, and turning gear runs for more than 4 hours, cylinder inside and shaft seal part without clash sound or other abnormal sound .(regulation of minimum continuous running time before starting turbine must be executed).

5） Check and make sure that gland sealing steam head pipe pressure is 0.007-0.021Mpa, gland sealing steam temperature and rotor surface metal temperature match with each other with differential temperature less than 110℃, LP gland sealing temperature control automation is in operation.

6） Affirm that turbine lubricate oil pressure is 0.1～0.18MPa, lubricate oil temperature is 38℃～

42℃.

7） Generator sealing oil system, stator cooling water system and hydrogen cooling system work normally.

8） Turbine TSI indication is normal.

2.4.3.2 Conditions for turbine latch 1） There is no condition prohibiting unit start.

2） Make sure that HP & LP differential expansion, axial displacement, HP & IP & LP up and down differential temperature, eccentricity, differential temperature of inner & outer wall of steam chamber are in limited range. Changing trend should not exceed limitation after turbine starts.

3） Cold state start parameter：

Main steam pressure: 5.9MPa Reheat steam temperature: 300℃

Main steam temperature: 340℃ Reheat steam pressure: 1Mpa.

Main and reheat steam have >56℃ superheat degree.

4） Condenser vacuum at HP & LP side >80KPa。

5） Lubricate oil temperature is higher than 35℃, returning oil of all bearings are normal.

6） Lubricate oil pressure: 0.1～0.18MPa。

7） Turbine turning gear works normally and sound is normal.

8） LP cylinder water spraying valve is in „automation‟.

9） Close HP & LP bypass valves.

10） Remote and manual latch handle is recovered.

11） DEH screen check:

Stick chart or explanation State Literal explanation HP main steam valve position

indication 0％ valve position TV1，2

hp regulating valve position

indication 0％ valve position GV1，2，3，4

Reheating regulating valve position

indication 0％ valve position IV1，2，3，4

Reheating main steam valve position

indication CLOSED Closed (green light shine)

Main breaker state Breaker Open Breaker Open

Turbine state Turbine stop Trip

Valve control mode SINGLE Single valve

Generator power control loop OFF Cut-off

Main steam pressure control loop OFF Cut-off

Turbine control mode MANUAL Manual

2.4.3.3 Turbine latch

1） Select „Latch turbine‟ button on screen and click „ETS recover‟, click „Latch turbine‟ after ETS recovered and select „YES‟ for turbine latch. After successful latch, check that IP main steam valve is open, green light of „Enable Roll‟ is on.

2） Select „automation‟ in „control mode‟ on DEH screen.

3） Select „Valve position high limitation‟ from „Limitation value‟ on DEH screen, enter „120‟ and click „GO‟, check that IP regulation valves and HP regulation valves are open.

4） Operate over speed trip actuator with remote trip button or manual trip pole installed at front box, close all steam inlet valves. Test and check whether trip system is normal or not.

5） Repeat above operations, turbine latch again.

2.4.3.4 Operation and check before starting turbine

1） Test the OPC function on DEH screen, click „OPC Test‟ button and click „IN‟, check OPC solenoid valve action. HP & IP governor valves, HP steam discharging check valve and check valves of all steam extraction are closed. Click „OPC Protection‟ button, OPC protection „IN‟, above valves open.

2） Select „Single valve‟ mode from „Valve Mode‟ on DEH screen.

3） Make sure that main steam pressure, temperature meet the requirements of cold state start.

4） Make sure that turbine first stage metal temperature is less than 120℃, according to IP cylinder steam inlet blades metal temperature, turbine should be heated up for 150min when running speed is 2000r／min.

5） Make sure that turning gear is running and turbine is latched.

6） Make sure that all the auxiliary system and equipments are running normally with no abnormal alarm signals.

7） Make sure that drainage valves of turbine proper, HP & IP system and LP cylinder water

spraying control switch are at „Automation‟.

8） Lubricate oil cooler, coolers at air & hydrogen side of sealing oil, hydrogen cooler and generator stator water cooler are ready for operation.

9） LP heater start with the turbine and start the LP heater steam supplying motorized valve, drainage water flows automatically stage by stage.

2.4.3.5 Start turbine with target speed of 600r/min, check the turbine clash

1） Click „Control set value‟ button on DEH screen and set speed rise rate of 150r/min with target speed of 600r/min. Click „GO‟ button, turbine starts to rise speed.

2） When running speed >3r/min, make sure that turning gear on CRT really exit from running and turning gear motor stops.

3） When running speed reaches to 200r/min, check and make sure that turning gear oil spraying solenoid valves are closed automatically.

4） When the turbine rotate speed reach 600r/min, keep 600r/min, press the “emergency shut down” button，check that HP-LP main throttle valve closed, rotate speed downgrade. Check turbine clash, listen sound of the cylinder inside, check that if the running part and static part have abnormal sound, check that if the rotor eccentricity normal, when eccentricity >0.075mm must forbid unit start.

5） After checking the friction, turbine latch again, the turbine rotate speed reach 600r/min, keep 600r/min,check the unit completely:

a. Up and down gas side start with the turbine.

b. Check bearing vibration, axial displacement ,differential expanse, cylinder absolute expansion, bearing metal temperature, return oil temperature, up and down cylinder differential temperature and so on in normal range. check eccentric recorder automatically disengage, vibration recorder begin to record the final rotor eccentric degree at rotate speed is 400～600r/min.

c. Check condenser hot well level, deaerator water level, up and down feeding water level all adjusting put into automatic control and operating normally.

d. Check turbine lube oil pressure and temperature, EH oil pressure and temperature, oil level of EH oil tank, bearing current are normal.

e. Check the generator hydrogen pressure, hydrogen temperature, sealing oil pressure and hydrogen-oil differential pressure are normal.

f. Confirm the LP watering door open automatically, LP exhaust temperature is less than70℃,vacuum is normal.

g. If the gauge above parameters or close to the parameters and may rise, should report immediately, identify the reason and prohibit to increase the speed.

2.4.3.6 Continue to rise speed with target of 2000r/min

1） Click „Control set value‟ button on DEH screen and set speed rise rate of 150rpm/min with target speed of 2000r/min. Click „GO‟ button, turbine continues to rise speed.

2） Unit continues to rise speed to 2000r/min and keep running speed of 2000r/min for heating up turbine. During heating up, heat up pipes with auxiliary steam.

3） During speed rise, if running speed needs to stay, click the „HOLD‟ button in „Control set value‟

on screen. It is prohibited to stay in resonance running speed range to avoid turbine resonance.

(1)700～900rpm (2)1300～1700rpm (3)2100～2300rpm

(4)2650～2850rpm

4） Heating up time should be decided according to first stage metal temperature, when this temperature is ≤120℃, heating up time should be 150min. Heat time should not be shortened under any condition. During medium speed heating up time, main steam temperature slowly slide to 380℃,reheated steam temperature slowly slide to 335℃(during this process, inlet steam can increase to 430℃,but the temperature rise rate can not more than 55℃/hour.) 5） During heating up, main steam temperature should not exceed 430℃ and reheating steam temperature should be higher than 300℃. Temperature rise should be controlled at

0.92℃/min.

6） During heating up, auxiliary equipments and systems should be checked completely, sounds in running parts are normal with no abnormal alarm.

7） After pipe heating, check and make sure that parameters for starting turbine are qualified and start the first steam driven pump with auxiliary steam according to actual conditions to avoid water impact.

8） The finishing condition of medium speed heating up : a. Make sure that time is up and heating up is completed.

b. Check and make sure that steam cylinder is evenly expanded.

c. HP & LP differential expansion decreases stably and gradually.

d. Indications do not exceed limitation and are stable.

2.4.3.7 Turbine running speed rise from 2000r/min to 2900r/min, transfer the valves 1） Click „Control set value‟ button on DEH screen and set speed rise rate of 150rpm/min with target speed of 2900r/min. Click „GO‟ button, turbine continues to rise speed.

2） When turbine rotate speed is 2850r/min,check that jacking oil pump stop automatically, or stop manual, put into standby.

3） Running speed continues to rise to 2900 r/min and running speed keeps at 2900 r/min; it is ready for valve transfer.

Make sure that inner wall temperature in steam chamber at least equals to saturation temperature under main steam pressure. See as annex of turbine inlet steam state which shows the relationship between inlet temperature and pressure of main steam valve in cold state start. If you want to make the temperature of steam chamber meet the required value, this parameter relationship should be obeyed.

4） „TV-GV‟ transfer operation

“（TV/GV CHANGE）”button, GV will close slowly, TV/GV CHANGE IN PROGRESS in the information bar will bright, when GV close to certain valve, TV will open slowly when TV completely open, switch is finished, unit increase speed to 3000rpm automatically, “TV/GV CHANGE IN PROGRESS” become dark. During the recorder valve switching process, speed fluctuation value does not exceed 30r/min.

5）Check EH oil system, regulate that hydraulic mechanism of system is not leakage and abnormal, it can continue to increase the speed.

2.4.3.8 Unit running speed increase to 3000 r/min

1） Click „Control set value‟ button on DEH screen and set speed rise rate of 150r/min with target speed of 3000r/min. Click „GO‟ button.

2） Running speed continues to rise to 3000 r/min and running speed keeps at 3000 r/min.

3） After turbine operating in normal speed, completely check unit and each system is normal.

a. Check and make sure that main oil pump outlet pressure is 2.0～2.5MPa and inlet oil pressure is 0.12～0.14MPa，main oil pump work normal.

b. Stop AC lubricate oil pump, sealing oil standby oil pump and put them in standby.

c. Regulate lubricate oil temperature to be 38～42℃ and bearing returning oil temperature

<77℃.

4） The following experiments as needed a. ETS channel online experiment

b. Critical protection device injection test(running 2000 hours)

c. Main steam valve, regulating steam valve strict test(after each overhaul, before speed (test) 2.4.4 Unit synchronization and loading

2.4.4.1 Following conditions should be prepared for turbine during unit synchronization:

1） Make sure that turbine runs with speed of 3000r/min and is stable; DEH device is normal.

2） All control indications are normal when turbine runs with empty load; auxiliary equipments are normal.

3） Tests under 3000r/min for unit are completed.

4） Main steam temperature and steam pressure are stable.

2.4.4.2 After completely checking that unit is operating normally, report to dispatcher, shift chief supervisor orders that the generator is synchronization

2.4.4.3 With 5% rated load

2.4.4.4 Check after synchronization

Heating up 30min at 5% rated load, during this period, maintain steam temperature,

Heating up 30min at 5% rated load, during this period, maintain steam temperature,

In document BOLETN GENERALES (página 117-121)