Dadri stage-1 Hot start up

 

After shut down

 

1)      Open CBD manual valve at firing floor and at 5.5 meter.

2)      Open seal steam atmospheric drain. Ensure that AS-9 must be opened and all manual valves at local are opened.

3)      Open strainers to IBD manual valve and ensure all MAL manual valves are opened

4)      Open SB-26  manual valve from TG floor

5)      Close E-2 , MS-1 and MS-2 close HP LP bypass also

6)      Open All Mal drains

7)      Open CBD motorised valve

8)      Close SH and RH spray valve

9)      Ensure AOP running, ensure starting of JOP at 510 RPM and gate valve gearing at speed less than 200 RPM

 

Hot Start up

10)  Adjust air flow to 350 t/hr

11)  Ensure all purge per missives  are coming if not then drum level can be simulated

12)  Start purging

13)  From unit 1 asked them to take second LDO pump in service

14)  Open HOTV and LOTV, close OFD & reduce SADC to 30 %.And WB dp at 50.

15)   Take LDO guns with repeated command

16)   Take HFO guns at CD elevation ,also start APH soot blowing

17)   If ignition permit ready then increase air flow and start PA fans

18)   Start seal air fan (it will come in auto )

19)   Take mill B in service slowly increase load

20)    If ignition permit ok for mill C then start it also and wait for temp rise

21)   Open MS-1 and MS-2, Charge HP AND LP bypass. HRH PR maintained at 15 KSC

22)    Ensure both CEP and both vacuum pump are running

23)    Seal steam must be charged

24)   Level of CST, hotwell and deaerator should be adequate

25)  Reset generator tripping by resetting all relays

26)   Bring Starting device to zero and speeder gear to 100%

27)   Load gradient  and controller ON

28)   Set load limiter at 50 MW and load reference at 30 MW and Load gradient at 30 dp/dt

29)   Close MAL-11 and MAL-12.

30)   Ensure criteria of LT01,LT02,AND LT03

MS TEMP AT TURBINE INLET

MIN ------ MID METAL TEMP OF HPCV+ 50 DEGREE

MAX ------ MID METAL TEMP OF HPCV+ 150 DEGREE

 

31)  If ok then raise starting device between 40 to 50 % stop valve will opened( step -5 of ATRS)

32)   Ensure criteria of LT04 and LT05 are satisfied

  MS TEMP AT TURBINE INLET

MIN ------ MID METAL TEMP OF HP CASING + 40 DEGREE

MAX ------ MID METAL TEMP OF HP CASING+ 800 DEGREE

 

33)   first open MAL 11 AND MAL12 then raise speed set point to 540 rpm

34)   Turbine speed more than 250 rpm turning gear should be off and at speed more than 540 rpm JOP should be taken out.

35)   At this moment inform switchyard to connect isolator of generator breaker.

36)  If criteria of LT06 is satisfied i.e.

 

MAX STEAM TEMP < MID METAL TEMP OF HP CASING + 100 DEGREE

       

      37)  Raise speed set point to 3000 rpm with constant watch on turbine parameters             and close mal-11 and12

38)   Around 2800 rpm aop will cut off

39)   For synchronisation ensure criteria LT07  satisfied i.e. HRH steam temp – IP shaft temp become less than specified curve X-7

40)   Close generator field breaker,field flashing supply will come with an alarm

41)  Adjust generator voltage to 16.5KV by adjusting AUTO knob.

42)   Made Synchronizer on.

43)   Adjust speed set point

44)  Close GENERATOR breaker

45)   Raise load set point so that machine comes in load controller mode if it still not coming then slightly reduce speed reference point