PPT ON HP BYPASS

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HP BYPASS  Presentation Transcript

1.HP BYPASS

2.HP  BYPASS OPERATION
RAISING OF STEAM PARAMETER DURING TURBINE ROLLING
 PARALLEL OPERATION  WITH TURBINE ON LOAD REJECTION
 PREVENTING SAFETY VALVES OPENING AT RAISED STEAM PRESSURES.

3.HPBP OPENING CRITERIA
 HPBP DOWN STREAM    TEMPERATURE < 380 Deg C
 CRH DRAIN POT LEVEL NOT  HIGH
 CONDENSER VACUUM > -0.8 Ksc

4.FAST OPENING OF HP BYPASS
 GENERATOR  BREAKER  OPENS
 TURBINE LOAD SHEDDING RELAY OPERATED
 PR. COTROLLER DEVIATION  HIGH (>10%)
 DEPRESSING OF “ FAST OPEN “ PUSH BUTTON FROM  UCB

5.LP BYPASS

6.OPENING CRITERIA
 Injection water Pr. > 25 Ksc
 Exhaust steam Pr. < 19 Ksc
 Condenser Wall Temp. < 90 DegC
 Condenser Vacuum > -0.8 Ksc

7.AUTO SHUT-OFF OF LP BYPASS
 CONDENSER  VACUUM  LOW  ( BACK PR. > 220 mm of Hg.)
 SPRAY  WATER  PR.  LOW  (<10 Ksc)
 CONDENSER  WALL  TEMP.  HIGH  ( > 90*C )
 LPBP  DOWN  STREAM  PR.  HIGH  ( > 19 Ksc )

8.HP-LP BYPASS CAPACITY
60% OF FULL
 LOAD   CAPACITY

9.REHEAT  PROTECTION
Turbine Trips & HP-LP bypass does not open. It will trip the Boiler after 5 Sec of turbine trip.
ARMING ------
200 T/Hr STEAM FLOW THROUGH
REHEATER