3.Boiler Emergency for coal bashed thermal power..ppt

Emergency of boiler

1. 09/16/25 S.VISWANATHAN 1

2. 09/16/25 S.VISWANATHAN 2
BOILER EMERGENCIES
•EMERGENCIES ARE CONDITIONS
WHERE THE OPERATING
PARAMETERS DEVIATE FROM
NORMAL VALUES
•IF THE ABOVE CONDITION IS
ALLOWED TO CONTINUE IT MAY
RESULT EITHER IN TRIPPING OF
BOILER OR DAMAGE TO EQUIPMENT

3. 09/16/25 S.VISWANATHAN 3
HANDLING EMERGENCIES IN
BOILER OPERATION
•CERTAIN EMERGENCIES REQUIRE TO
IDENTIFY THE CAUSE AND CORRECT
IT
•CERTAIN EMERGENCIES REQUIRE TO
STABILSE THE OPERATION FIRST
AND THEN TO IDENTIFY THE FAULT
FOR CORRECTION

4. 09/16/25 S.VISWANATHAN 4
HIGH FURNACE PRESSURE
CAUSES AND REMEDIES
–ONE I,D TRIPPED. F.D. DID NOT TRIP.
•TRIP ONE F.D. MANUALLY
–MAL OPERATION OF CONTROL VANES OF
ID,FD FANS.
•CHECK FANS LOADING AND MANUALLY CORRECT
LOADING
–CLOSURE OF DAMPERS ON FLUE GAS SIDE
DAMPERS
•CHECK THE POSITIONOF DAMPERS/DP ACROSS
DIFFERENT ZONES AND OPEN DAMPERS

5. 09/16/25 S.VISWANATHAN 5
HIGH FURNACE PRESSURE
–UNSTABLE FLAME CONDITION DUE TO
SUDDEN STARTING OF MILL,LOW WIND BOX
PRESSURE.
•REDUCE LOAD ON OTHER RUNNING MILLS. CHECK
SY.AIR DAMPERS AND ADJUST
–UN EQUAL BURNER TILT
•CORRECT BURNER TILT
–FOULED AIR HEATER
•CHECK DP. ACROSS AIR HEATER AND CARRY OUT
SOOT BLOWING IF NECESSARY

6. 09/16/25 S.VISWANATHAN 6
HIGH FURNACE PRESSURE
–AIR HEATER TRIPPED
•REDUCE LOAD ON BOILER
–FURNACE WATER SEAL BROKEN.
•RESTORE WATER SUPPLY TO SEALS
–FLUE GAS PATH DOORS OPEN
•INSPECT FLUE GAS PATH AND CLOSE THE DOORS
–WATER WALL TUBE PUNCTURE.
•INCREASE I.D. FAN LOADING. REDUCE
LOAD.CLOSELY MONITOR THE DRAUGHT.PLAN FOR
SHUT DOWN OF BOILER

7. 09/16/25 S.VISWANATHAN 7
LOW FURNACE PRESSURE
•ID FAN AUTO CONTROL FAILURE
•INADVERDANT OPEN OF ID VANES
–TAKE DRAUGHT CONTROL ON MANUAL AND
DECREASE LOADING ON I.D.FANS
•TRIPPING OF ONE FD FAN
–REDUCE LOADING ON I.D. FANS AND TRIP ONE I.D. IF
NECESSARY
•SUDDEN TRIPPING OF MILL
–INCREASE LOADING ON RUNNING MILLS.CUT IN OIL
SUPPORT IF NECESSARY
•MILL/RC FEEDER/COAL PIPE CHOKE
–TRIP THE TROUBLED MILL. INCREASE LOADING ON
RUNNING MILLS.CUT IN OIL SUPPORT IF NECESSARY

8. 09/16/25 S.VISWANATHAN 8
LOW FURNACE PRESSURE
•PARTIAL FLAME FAILURE
–REDUCE LOADING ON BOILER.ISOLATE THE
ELEVATION WHERE FLME FAILURE HAS
OCCURRED.FIND THE CAUSE ELIMINATE AND RESTART
THE ELEVATION
•INADVARDANT CLOSURE OF AIR PATH DAMPERS
–INSPECT AIR PATH.OPEN THE CLOSED DAMPERS

9. 09/16/25 S.VISWANATHAN 9
DRUM LEVEL LOW
•MAL OPERATION OF FEED AUTO CONTROL
•MAL OPERATION OF FEED REGULATOR/SCOOP
TUBE
–TAKE FEED CONTROL ON MANUAL. INCREASE WATER
FLOW
•ONE BFP TRIPS AND STANDBY DOES NOT START
ON AUTO
–START STAND BY ON MANUAL MODE
•LOAD THROW OFF
–REDUCE FIRING RATE AS FASTAS POSSIBLE WITHOUT
CAUSING FLAME FAILURE.
•SUDDEN INCREASE IN FIRING RATE
–REDUCE LOADING ON STABLE RUNNING MILLS

10. 09/16/25 S.VISWANATHAN 10
DRUM LEVEL LOW
•TUBE PUNCTURE
–TAKE FEED CONTROL ON MANUAL. INCREASE
FEEDING. REDUCE LOAD.CLOSELY MONITOR
THE DRUM LEVEL.PLAN FOR SHUT DOWN OF
BOILER
•INADVARDANT OPENING OF LOW POINT
DRAINS EDD VALVE
–INSPECT AND CLOSE THE VALVES

11. 09/16/25 S.VISWANATHAN 11
DRUM LEVEL HIGH
•MAL OPERATION OF FEED CONTROL
–TAKE FEED CONTROL ON MANUAL. DECREASE WATER
FLOW
•SUDDEN INCREASE IN UNIT LOAD
–INCREASE FIRING RATE BY TAKING OIL SUPPORT
•SUDDEN DECREASE IN FIRNG RATE
–INCREASE FIRING RATE BY TAKING OIL SUPPORT
•SCOOP TUBE POSITION SUDDENLY INCREASED
–TAKE FEED CONTROL ON MANUAL. DECREASE WATER
FLOW