Partial Load O/H Full Load Summer Winter

CW SYSTEM
STAGE-1
PARTIAL
LOAD
ALL UNIT
I/S
one unit
under O/H
ONE UNIT
OUT OF
service
O/H
FULL LOAD
SUMMER
WINTER
Two pumps
are stopped
6
CW SYSTEM
STAGE-2
PARTIAL
LOAD
ONE UNIT
I/S
BOTH UNIT
IN I/S
O/H
FULL LOAD
SUMMER
WINTER
DRAFT SYSTEMS
STAGE-1
BTL
LIGHT UP
JUST BEFORE
SYNC
DRAFT/O2
(FORCE
COOLING)
ID FAN
-10
FD FAN
3-3.5 %
After boiler cooling, Fans along with its LOP is stopped.

All APH are stopped when APH inlet flue gas temp <
100deg
DRAFT SYSTEMS
STAGE-2
BTL
LIGHT UP
JUST BEFORE
SYNC
DRAFT/O2
(FORCE
COOLING)
ID FAN
-5
FD FAN
3-3.5 %
After boiler cooling, Fans along with its LOP is stopped.

All APH are stopped when APH inlet flue gas temp <
100deg
CONDENSATE & FEED WATER

SYSTEM
STAGE-1
STARTUP
JUST
BEFORE
SYNC
>70%
LOAD
HYDROTE
ST
MDBFP
TDBFP
N/A
N/A
N/A
N/A
BCW
N/A
N/A
N/A
N/A
CEP
2
(before LP
B/P charging)
BOILER
FILLING
BTL
FORCE
COOLING
1
BOILER
FILL PUMP
N/A
After unit shut down, all CEP is stopped after LPT exhaust hood
temp. reaches normal running temperature after temp. rise .
BFP is run as per Boiler cooling requirement.
CONDENSATE & FEED WATER

SYSTEM
STAGE-2
STARTUP
JUST
BEFORE
SYNC
>70%
LOAD
HYDROTE
ST
MDBFP
TDBFP
BCW
CEP
2
(before LP
B/P charging)
BOILER
FILLING
BTL
FORCE
COOLING
1
BOILER
FILL PUMP
After unit shut down, all BCW pumps are stopped when drum metal temp. reaches 100
deg
After unit shut down, all CEP is stopped after LPT exhaust hood temp. reaches normal
running temperature after temp. rise .
MILLING SYSTEMS
STAGE-1
DURING
START UP
WHEN APH
AIR OUTLET
FULL LOAD
TEMP>180
0
& HP/LP
BYPASS I/S
MILL
PA FAN
4
2
BLENDED COAL
PARTIAL
LOAD
60 TO 80 % 80-100%
LOAD
LOAD
After unit shut down, LOP of PA fans and mills stop after 30min. as per logic
During cold startup , Mill is taken i/s after Synchronization
MILLING SYSTEMS
STAGE-2
DURING
START UP
WHEN APH
AIR OUTLET
FULL LOAD
TEMP>180
0
& HP/LP
BYPASS I/S
MILL
PA FAN
6 or 7
2
(AFTER 3 MILLS
I/S)
BLENDED COAL
PARTIAL
LOAD
60 TO 80 % 80-100%
LOAD
LOAD
After unit shut down, LOP of PA fans and mills are stopped
after sometime
ESP SYSTEMS
STAGE-1
HOPPER HEATER
OFF AFTER HOPPER ASH EMPTY
FIELDS
OFF AFTER 01 hour of UNIT S/D
RAPPING MOTORS
OFF AFTER 04 HR CONT. RUN
ESP SYSTEMS
STAGE-2
HOPPER HEATER
OFF AFTER HOPPER ASH EMPTY
FIELDS
OFF AFTER UNIT S/D
RAPPING MOTORS
OFF AFTER 04 HR CONT. RUN
AHU
1 OUT OF 2 AHU IS STOPPED
LDO/HFO SYSTEMS
STAGE-1
LDO PUMP
DISCHARGE PR MAINTAINED AT
16 KSC
HFO
PR MAINTAINED 10-11 KSC AT F/F

with long recirculation in open
condition
LDO/HFO SYSTEMS
STAGE-2
LDO PUMP
DISCHARGE PR MAINTAINED AT 9
KSC
HFO
PR MAINTAINED 6 KSC AT F/F

AFTER CV (SET POINT CHANGE
TO 9 KSC IN AUTO WHEN ANY
HONV OPEN)
ECW SYSTEMS
STAGE-1
Two(out of three) ECW are i/s during
normal Unit running.
One ECW is kept i/s during unit under shut
down till cooling water requirement in the
unit.
ACW/ECW SYSTEMS
STAGE-2
ONLY ONE ACW I/S IN WINTER AT FULL
LOAD
ALL ACW ARE STOPPED AFTER UNIT
SHUT DOWN KEEPING SUCTION &
DISCHARGE V/V OPEN
ONE TGECW IS STOPPED AFTER UNIT
SHUT DOWN
SGECW IS STOPPED AFTER BOILER
COOLING.
AIR COMPRESSORS
STAGE-1
When any unit is stopped for short
shut down, one compressor is
stopped after isolating service air of
that unit.
APC REDUCTION STRATEGY AFTER UNIT

SHUT DOWN
STAGE-1
Only following equipments are in

service during unit short shut down :
1.
2.
3.
4.
5.
6.
7.
Aux. OIL P/P

One JOP
Seal Oil Pump
01 ECW P/P
Stator Water P/P
Scanner fan as per furnace cooling requirement
APH motor till flue gas temp. <100 deg.
APC REDUCTION STRATEGY AFTER UNIT

SHUT DOWN
STAGE-2
Only following equipments are in

service during unit short shut down :
1.
2.
3.
4.
5.
6.
7.
8.
9.
TG LUB OIL P/P

TG JOP
AIR SIDE SOP
H2 SIDE SOP
01 TGECW P/P
PW P/P
CF P/P
TDBFP LUB OIL P/P
LP BY PASS OIL P/P
AIR CONDITIONING & AIR WASHER SYSTEM

STAGE-1
In winter season, all Air Washer Units are stopped.

In winter season, main a/c compressors and VAM are
stopped and condensate water is circulated in chilled water
circuit.
In summer season, VAM is kept in service for unit # 3
&4(Unit #1&2 VAM not provided).
AIR CONDITIONING & AIR WASHER SYSTEM

STAGE-2
1 Set of air washer is stopped in AB bay and BC bay after

unit shut down.
In winter season, all Air Washer Units are stopped.
In winter season, AHU and screw chiller are regulated as
per temperature requirement.
In summer season, VAM is kept in service instead of screw
chiller

Partial Load O/H Full Load Summer Winter

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Partial Load O/H Full Load Summer Winter

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CW SYSTEM

After boiler cooling, Fans along with its LOP is stopped.

After boiler cooling, Fans along with its LOP is stopped.

CONDENSATE & FEED WATER

CONDENSATE & FEED WATER

OFF AFTER HOPPER ASH EMPTY

OFF AFTER 01 hour of UNIT S/D

OFF AFTER 04 HR CONT. RUN

OFF AFTER HOPPER ASH EMPTY

OFF AFTER UNIT S/D

OFF AFTER 04 HR CONT. RUN

1 OUT OF 2 AHU IS STOPPED

PR MAINTAINED 10-11 KSC AT F/F

PR MAINTAINED 6 KSC AT F/F

APC REDUCTION STRATEGY AFTER UNIT

Only following equipments are in

Aux. OIL P/P

APC REDUCTION STRATEGY AFTER UNIT

Only following equipments are in

TG LUB OIL P/P

AIR CONDITIONING & AIR WASHER SYSTEM

In winter season, all Air Washer Units are stopped.

AIR CONDITIONING & AIR WASHER SYSTEM

1 Set of air washer is stopped in AB bay and BC bay after

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