fsss control
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FSSS DESIGN DESCRIPTION
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HARYANA POWER
GENERATION CORPORATION
PANCHKULA, HARYANA
DESEIN PRIVATE LIMITED
CONSULTING ENGINEER,
NEW DELHI
CENTRAL ELECTRICITY
AUTHORITY, SEWA BHAWAN
DCR THERMAL POWER PROJECT
(2X300MW), YAMUNANAGAR
FSSS DESIGN DESCRIPTION
RELIANCE ENERGY LIMITED
REL TOWER, A-2, SECTOR-24
NOIDA (U.P) – 201301
SHANGHAI ELECTRIC (GROUP)
CORPORATION (SEC)
3669 Jindu Road, Shanghai, China
HONEYWELL Honeywell(Tianjin) Ltd
Shanghai Power Equipment
Research Institute
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HONEYWELL
Honeywell(Tianjin) Ltd
Shanghai Power Equipment Research Institute
Project: DCR THERAMAL POWER PROJECT (2X300MW), YAMUNANAGAR
Document title: FSSS DESIGN DESCRIPTION
Document no: 93601179-FSSS-1PSC-01-01
Endorsement
Guo
Rong 2007.1 KangLei 2007.1 Yangjingqi 2007.1
REV DRAWN DATE CHECKED DATE REVIEWED DATE APPROVED DATE REM.
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YANMUNA POWER PLANT FSSS DESIGN
TABLE OF CONTENTS
1, Logic design of MFT--------------------------------------------- ----------------------------4
2, Logic design of furnace purging-------------------------------------------------------------7
3, Logic design of leakage test ------------------------------------------------------------------8
4, Logic design of oil trip-valve-----------------------------------------------------------------11
5, Logic of oil back-valve------------------------------------------------------------------------11
6, Logic design of OFT--------------------------------------------------------------------------12
7, Logic design of oil burner--------------------------------------------------------------------13
8, Programme of pulverizer logic design-----------------------------------------------------18
9, Pulverizer seal air damper logic-------------------------------------------------------------21
10,Burner inlet cut off valve logic---------------------------------------------------------------212
11,Pulverizer outlet cut off valve logic---------------------------------------------------------22
12, Pulverizer inlet cooling valve logic---------------------------------------------------------22
13, Pulverizer inlet hot valve logic--------------------------------------------------------------22
14, Pulverizer logic---------------------------------------------------------------------------------23
15,Coal feeder logic--------------------------------------------------------------------------------23
16, Coal feeder outlet valve logic----------------------------------------------------------------23
17,Coal feeder inlet valve logic-------------------------------------------------------------------25
18,Pulverizer fire steam valve logic--------------------------------------------------------------2519,Cooling fan logic---------------------------------------------------------------------------------25
20, Runback Logic design--------------------------------------------------------------------------26
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一、LOGIC DESIGN OF MFT
The Conditions Of MFT Action:
Condition OR)
MFT action by any condition coming
Remark
1. Turbine trip 10OTRIP
2. All of the P.D.F stopped 10HLB10AN001XB02A,10HLB20AN001XB02A
3. All of the I.D.F stopped 10HNC31AN001XB02A,
10HNC32AN001XB02A,10HNC33AN001XB02A
4. All of the P.A.F stopped(any
Pulverizer is Running)
10HFE10AN001XB02A,10HFE20AN001XB02A
5. All of the cooling air fan stopped 10HLSGC001DI03,10HLSGC002DI03
6. (XXXPa)Pressure of cooling air low(two
of three) Delay 10s
10HLS10CP304,10HLS10CP305,
10HLS10CP306
7. (XXXPa)Pressure of furnace high(two of
three)
10HCP302B,10HCP303A,10HCP304A
8. (-XXXPa)Pressure of furnace low(two of
three)
10HCP302A,10HCP303B,10HCP304B
9. (XXXmm)Level of drum high(two of
three)
10ADRUMLVL,10BDRUMLVL,10CDRUMLVL
10. (-XXXmm)Level of drum low(two of
three)
10ADRUMLVL,10BDRUMLVL,10CDRUMLVL
11. All of the air preheaters stopped 10HLD11AC001XB02A,
10HLD11AC002XB02A,
10HLD12AC001XB02A,
10HLD12AC002XB02A,
12. Air flow less than 30% Delay 60s 10AIR30L
13. Manual trip by operator
14. (545℃)Reheater lose protection Furnace outlet air temperature high,
high temperature drain tap and
bypass valve closed
15. Fuel lose All of the pulverizers stopped and
oil trip valve closed, Or all of the
pulverizers stopped and burner oil
valve tripped(any three have been
opened)
16. Flame lose of any corner more than half pulverizers are
running, but any corner loses flame
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and the running pulverizers number
>= 3
17. Flame lose of furnace At least 3 flames can’t be detected
by flame detector in every layer and
pulverizers have been started
MFT logic is of the function of the first out memory, record the
reset of MFT .
The actions of FSSS will come after MFT action:
1. Close oil trip valve FSSS
2. All of the ignitors canceled, retracted and forbidden FSSS
3.
All of the burner oil valves closed FSSS
4. All of the pulverizers and coal feeders trip FSSS
5. The pulverizer outlet valves close FSSS
6. The coal feeder inlet & outlet valves close,
pulverizers hot air valve & cool air valve closeFSSS
MFT relay action
MFT relays act by getting power when any condition of MFT action is coming
MFT relay reset
Condition AND) remark
1. No condition of MFT action is coming
2. The purge of furnace is completed
3. MFT is reset by the operator
MFT relay is reset by all of the three conditions coming
Fig.(1)
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As shown in Fig.(1),the first out of MFT will be displayed when MFT is coming.
We can select the button as shown in Fig.(1) to reset MFT after no MFT
condition coming and completing the purge of furnace, and a red frame appears
around the operating faceplate which indicates that we can reset the MFT by
left mouse clicking on the “MFT RESET” button.
二、LOGIC DESIGN OF FURNACE PURGING
Explanation of furnace purging:
We must purge furnace before every time of starting boiler or after MFT
tripped(no burner is running), which means that purging the combustible in
the furnace and flue in valid time by prescriptive air flow to confirm the
cleanness of the flue. We can reset the MFT relay only after furnace purging
completed.
Preconditions of furnace purging:
Condition AND) Remark
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1. No condition of purging completed
2. No condition of MFT
3. Any P.D.F is running and outlet valve is opened
4.
The chimney and end of flue is expedite(at least
one of the flue is expedite, means that the inlet
valve of the air preheater, I.D.F , electric dust
catcher are opened), and the I.D.F is running
5. All of P.A.F stopped
6. The motor and rotor of air preheater A(or B) are
running normally
I.
7. All of the electric dust catchers stopped
8. No flame in the furnace
9.
All of the burner oil valves closed 10. All of the coal feeders stopped
11. All of the pulverizers stopped
12. All of the pulverizer outlet valves closed
The process of purging
We must purge furnace before every time of starting boiler or after
MFT tripped(no burner is running), “purge is ready” will be displayed
in the picture when all of purge conditions are coming, then operator
can start purge after clicking the “start to purge” button.
一,Send out the signal to open the secondary air baffle (Long signal, willbe reset after purge completed)
二, Start to count down after all of the conditions are ready:
Condition AND) Remark
1. Air flow more than 30% From MCS
2. All of the secondary air baffle
position more than 80%From MCS
3. The level of drum normal From MCS
4.
The minus pressure of furnacenormal
“Purge is running” signal will be sent out after all of the above
conditions are ready, and last 300s. “Purge is completed” signal will
be sent out after the leakage test completed successfully.
We should wait one minute at least to start the purging if the MFT is
caused by P.D.F or I.D.F tripped.
三,If any purging condition is not satisfied during the 300s, the “purging
is interrupted” signal and cause will be sent out , the boiler need to
be purged again. We can purge again after all of the conditions are ready
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until purging completed.
三、LOGIC DESIGN OF LEAKAGE TEST
Preconditions of leakage test:
Condition AND) Remark
1. Oil pressure normal
2. Oil trip-valve closed
3. Oil back-valve closed
4. All of the burner oil valves closed
5. OFT is coming or No MFT & pulverizers are
running
Start leakage test:
Start leakage test manually
Stop leakage test OR):
1. Operator stops leakage test manually
2. MFT is coming ( MFT occurs during the leakage test on the boiler running
normally)
3. Leakage test failure
4. Leakage test completed successfully
Step design of leakage test:
一, Open oil supply-valve
二, Oil supply-valve opened, open oil trip-valve
三, Oil trip-valve opened & oil back-valve closed, delay 15s , send out
signal to detect oil pressure .
1. “Leakage test failure” will be sent out when the oil pressure is not
normal, then stopping the leakage test(close the oil trip-valve).
2. “Close oil trip-valve” signal will be sent out if oil pressure is
normal after 45s delay.
四, Oil back-valve & oil trip-valve closed, “detect oil pressure” will besent out after 180s delay.
1. Oil pressure is higher or not(leakage may be caused by oil trip-valve)
2. Oil pressure is lower or not(leakage may be caused by oil back-valve
or burner oil valve)
3. “Leakage test failure” will be sent out to stop test if oil pressure
is higher or lower ,then oil supply-valve and oil back-valve will be
closed automatically.
4. Oil back-valve will be opened after 20s delay if the oil pressure is
normal
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五, After oil back-valve opened and oil trip-valve closed , oil pressure will
be detected after 10s delay
1. “Leakage test failure” will be sent out to stop test if oil pressure
is not low (leakage pressure high)
2. Oil back-valve will be closed after 25s delay if there is no failure
六, Alarm will be sent out if there is any failure in the test of oil trip-
valve or back-valve, then “Leakage test failure” will be sent out to
stop test
七, “Leakage test completed successfully” will be sent out after clicking
the “test bypass” button
八, If the leakage test is failed , we should check the cause , then start
test again by clicking the “start leakage test” button after reset the
test.九, The test will be stopped by clicking the “stop” button during the test,
and oil supply-valve and back-valve will be closed
Leakage test is of function to indicate the information and alarm about
process 、end of test
Fig. 3)
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1. MFT or OFT is coming ( leakage test is not running) Long
signal
2. Leakage test failure
Oil trip-valve will be controlled automatically during the leakage test
五、LOGIC DESIGN OF OIL BACK-VALVE
1. Oil back-valve will be controlled automatically during the leakage test
2. If the condition of OFT reset is ready, operator can reset OFT ,then oil
back-valve will be opened automatically
六、LOGIC DESIGN OF OFT
Conditions of OFT action
Condition OR) Remark
1. MFT(Long signal)
2. OFT manually
3.
Oil trip-valve or supply-valveis closed and burner valve is
not closed
4. Oil pressure is low during the
burner is running
Oil pressure is low after any burner
valve is opened
5. Any burner valve failure No opened or closed signal during 15s
After OFT is coming:
1. Close the oil trip-valve
2. Retract the oil gun and igniter
3.
Close all of the burner oil valves
Reset of OFT (AND):
1. All of the oil guns and burner oil valves are closed
2. Leakage test completed
3. No condition of OFT
4. Click “Reset OFT” button
As shown in Fig. (1) , the operation of OFT reset is same as the MFT reset.
七、LOGIC DESIGN OF OIL BURNER
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Function of system:
1, The system is of the function to control single oil gun, diagonal oil gun
or group oil gun automatically(there is no stop command and OFT during the
starting process)
2, Every oil gun can be ignited and stopped automatically after receiving the
signal
3, Starting of group oil gun:
a) Oil gun 1、2、3、4 are ready, then click the start button manually
b) First of all , No.1 oil gun will be started(3s pulse), No.3 oil gun
will be started after No.1 completed, then start No.2,No.4 as the same.
c)
“Stop” command will be sent out if there is any under condition:d) OFT, stop manually , any oil gun started failure, after sending out the
command to start the No.4 oil gun.
4, Starting of diagonal oil gun, such as oil gun No.1 & No.3
a) No.1 & No.3 oil gun are ready, then start diagonal oil gun signal
manually
b) No.1 oil gun will be started(3s pulse), No.3 oil gun will be
started(3s pulse) after No.1 completed
c) “Stop” command will be sent out if there is any under condition:
d)
OFT, stop manually , after sending out the command to start the No.4
oil gun.
5, Stopping of group oil gun:
a) Click the stop button manually
b) First of all , No.1 oil gun will be stopped, No.3 oil gun will be
started after 15s, then stop No.2,No.4 as the same.
c) “Stop” command will be sent out if there is any under condition:
d) OFT, after sending out the command to stop the No.4 oil gun.
6, Stopping of diagonal oil gun, such as oil gun No.1 & No.3
a) Click the stop button manually
b) First, send out command to stop No.1 oil gun, send out command to stop
No.3 oil gun after 15s
c) “Stop” command will be sent out if there is any under condition:
OFT, after sending out the command to stop the No.3 oil gun
Permissions of burner oil ignition:
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Condition AND) remark
1. Oil pressure is normal
2. Oil temperature is normal
3.
Oil trip-valve opened
4. MFT relay is reset
5. OFT relay is reset
6. Cooling air pressure is
normal
7. Air Flow > 30MCR
8. All of the burner nozzles are
horizontal or there is flame
in furnace
9.
Furnace purging completed0. aFurnace differ pressure is
norml
Logic design of Starting oil gun:
Permissions of starting oil gun automatically:Condition AND) Remark
1. Permission of burner oil ignition
2.
Burner oil valve closed3. Burner purge valve closed
4. Oil layer is remote
5. No forbidden command of burner oil
ignition
It is not allowed to ignite
again in 60s after it failed
Process of starting oil gun automatically:1. Oil gun is in the automatic mode, then send out signal “Oil gun is in
ignition mode”
2. Extend oil gun (no extended signal in ignition mode)
3.
Oil gun purging (oil gun extended in ignition mode) 20s4. Extend igniter (oil gun extended, purging completed) 15s
5. Open vapour steam valve ( igniter extended)
6. Open burner oil valve (vapour steam valve opened)
7. Ignition (burner oil valve opened, igniter extended, oil gun extended) 15s
8. Oil gun is in service (flame is detected, burner oil valve opened)
9. Delay Xs when oil gun is in ignition mode, program will be stopped when
burner oil valve is not opened , then oil gun will be retracted.
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10. If there is any under condition after oil gun and valve opened, program
will be stopped ,oil gun and valve will be closed automatically and
purging will be started:
Ignition failure Burner oil valve is not closed , there is no
flame can be detected after 15s
Burner oil valve failure Burner oil valve is not closed , there is no
opened signal after 5s
Oil gun is not extended Burner oil valve is not closed and oil gun
is not extended
Atomizing steam valve
failure
Atomizing steam valve not closed
Fuel trip OFT is coming
The logic of starting oil gun is of the function to alarm the first out MFT
memory
Logic design of stopping oil gun: After clicking the “stop” button to stop oil gun when oil gun is in service
and remote:
1. Send out command to extend igniter and close burner oil valve
2. Ignite after igniter extended (15s)
3.
Send out command to purge after burner oil valve is closed(20s)4. Retract oil gun after purging completed
5. Reset “stop oil gun” command after oil gun retracted
6. Program will be stopped if there is any device failure in the process, and
alarm
Purging logic design of oil gun:
1. Requirement of purging (Purging command will be sent out if there is any
under condition until purging completed)
Burner oil valve closed (when this oil layer is in remote and power is
normal , valve closes abruptly after normal opening)
Purge before when starting oil gun
Purge before when stopping oil gun
2. Open vapour steam valve : condition(AND)
a) Requirement of purging
b) Oil gun extended
c) No MFT signal
3. Oil gun purging completed
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The purging time will last 20s after vapour steam valve is opened , then
send out “purging completed” signal
4. If there is any under condition to send out purging stop signal, “Purging
stopped” signal will be sent out and vapurt steam valve will be closed:
1. Oil gun is not extended
2. MFT Long signal
3. OFT Long signal
4. Vapour steam valve open failure
If MFT or OFT is coming , burner oil valve will be closed , ignition will be
stopped , igniter and oil gun will be retracted.
As shown in Fig. (5) ,the burning status of oil gun and the first out of
tripping will be displayed in the picture , we can operate single oil gun tostart , stop , make it locally or remotely , and the same as diagonal oil gun
and group oil gun.
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Fig. (5)
八、PROGRAMME OF PULVERIZER LOGIC DESIGN
The condition of burn coal
condition AND) Remark
1. Hot air temperature more
than 160℃
2. Air flow more than 30%
3. MFT Reset
PROGRAM START CONDITION AND) REMARK
1. Pulverizer ignition
energy OK
border upon oil running
Or load more than 60% and any two
coal feeder running
2. Burn coal permission
3. No other program start
4. Pulverizer is not
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running
5. Any one seal fan running
6. P.A hand pressure>10KPa
Start description
Step of pulverizer group start
1,Start lube oil pump ,and require open border upon S.A damper.
After satisfied the condition as below go alone next operation
CONDITION (AND) REMARK
1. Lube oil station started
2. Pulverizer is not running
2, Open pulverizer seal air valve
CONDITION (AND) REMARK
1. Pulverizer seal air valve opened
2. Pulverizer seal air outlet valve
opened
3. Seal air and P.A differ pressure
not low
3, Open pulverizer outlet valve
CONDITION (AND) REMARK1,All pulverizer outlet valve
opened
4, Open pulverizer inlet cooling valve
CONDITION (AND) REMARK
1. Pulverizer inlet cooling valve
opened
2. All burner inlet valve opened
3.
Pulverizer seal air outlet valveopened
4. Seal air and P.A differ pressure not
low
5. Coal feeder seal air valve opened
6. Pulverizer oil station OK
7. Pulverizer ignition energy OK and
burn coal permission
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5, START PULVERIZER
CONDITION (AND) REMARK
1. Pulverizer inlet cool valve opened
2. All burner inlet valve opened
3. Pulverizer seal air outlet valve
opened
4. Seal air and P.A differ pressure not
low
5. Pulverizer oil station OK
6. Pulverizer ignition energy OK and
burn coal permission
7. No other group is running
8.
No flame
9. P.A pressure normal
6,OPEN PULVERIZER INLET HOT VALVE ,AND REGULATE PULVERIZER OUTLET
TEMPERATURE
CONDITION (AND) REMARK
1. Pulverizer cooling valve opened
2. pulverizer hot valve opened
3.
55℃
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9, Open coal feeder inlet valve
CONDITION (AND) REMARK
1,Coal feeder inlet valve opened
Pulverizer trip
CONDITION (AND) REMARK
1. MFT Emergency
trip
2. Operator trip Emergency
trip
3. Pulverizer outlet temperature
more than 100℃
Emergency
trip
4. Runbak Emergency
trip
5. P.A flow less than xxx delay 15s Emergency
trip
6. Pulverizer lube oil station
trouble
Emergency
trip
7.
Seal air and P.A differ pressurelow delay 15s
(1000Pa) Emergencytrip
8. Any one pulverizer outlet valve
not opened or any burner inlet
valve closed yet pulverizer
running
Emergency
trip
9. Ignition energy lost delay 5s Emergency
trip
10. Pulverizer outlet temperature >
90℃ delay 2s
Emergency
trip
11. Ignition failure Emergency
trip
Action after pulverize emergency trip Execute the step as below at the same time
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1. Stop coal feeder, close coal feeder inlet valve and outlet valve
2. Stop pulverizer, close pulverizer outlet valve
3.
Close pulverizer inlet cooling and hot valve
4. To MCS close cooling and hot regulate valve
Action after pulverize fast stop Execute the step as below
1. Close hot and cooling regulate valve to xx position
2. Stop coal feeder , close coal feeder inlet and outlet valve
3. Stop pulverizer
4. Close cooling and hot valve
5.
Close pulverizer outlet valve
Pulverizer trip reset : AND)
1. No pulverizer trip condition
2. Pulverizer ignition energy satisfied
3. Burn coal permission
4. Pulverizer hot valve closed
Stop pulverizer design
Program start permission
CONDITION (AND) REMARK
1, No pulverizer trip condition
1, Set coal feeder command at minimal value , Delay 60s
CONDITION (AND) REMARK
1. Coal feeder command at minimal value
delay 60s
2, Close coal feeder inlet valve
CONDITION (AND) REMARK
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2. Coal feeder inlet valve closed
3, Close hot valve and set cooling regulate valve to xx position
CONDITION (AND) REMARK
1. Pulverizer inlet hot valve closed,
2. Pulverizer outlet temperature < 65℃
4,Stop coal feeder
CONDITION (AND) REMARK
5, Close coal feeder outlet valve
CONDITION (AND) REMARK
1. Coal feeder outlet valve closed
6, Stop pulverizer
CONDITION (AND) REMARK
九、PULVERIZER SEAL AIR DAMPER LOGIC
Open permission
Any seal fan running
Close permission
Pulverizer stoped
Close interlock
Pulverizer outlet temperature > 100℃
十、BURNER INLET CUT OFF VALVE LOGICManual operation , the four valve can be operate at the same time by manual ,
each valve also can be operate singly ,when program start pulverizer
interlock burner inlet cut off valve.
十一、PULVERIZER OUTLET CUT OFF VALVE LOGIC
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The condition of open permission
No MFT
Close permission
1. Pulverizer not running
Inlet cut off valve of the burner can be operate by manual
十二、PULVERIZER INLET COOLING VALVE LOGIC
The condition of open permission
1. Pulverizer outlet valve opened
2.
No MFT3. Pulverizer seal air valve opened and seal air differ pressure not low
The condition of close permission
1, Pulverizer not running
十三、PULVERIZER INLET HOT VALVE LOGIC
The condition of open permission
1. Pulverizer outlet temperature less than 80℃
2. Pulverizer outlet valve opened
3. No MFT
4. Coal feeder seal air valve opened
十四、PULVERIZER LOGIC
The condition of start permission1. Pulverizer inlet cooling valve opened
2. All burner inlet cooling valve opened
3. Pulverizer seal air valve opened
4. Seal air and P.A differ pressure not low
5. Pulverizer oil station OK
6. Ignition energy satisfied and burn coal permission
7. No other program is running
8. No flame
9. P.A pressure normal
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The condition of stop permission
Pulverizer not running
十五、COAL FEEDER LOGIC
The condition of start permission
1. Coal feeder outlet valve opened
2. Coal feeder speed command at minimal value
3. P.A flow more than XXX
4. Pulverizer running
The condition of stop permission1,Coal feeder speed at minimal value
Coal feeder trip
1. Coal feeder trouble
2. Pulverizer trip
3. Coal feeder outlet valve not open
4. Manual stop
INTERLOCK AFTER COAL FEEDER TRIP
1. Close coal feeder inlet valve
2. Close coal feeder outlet valve
十六、COAL FEEDER OUTLET VALVE LOGIC
The condition of open permission
1, Pulverizer outlet temperature
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十九、COOLING FAN LOGIC Cooling air pressure low interlock start standby fan
Cooling fan A logic
Interlock stop
Cooling fan motor bearing temperature > x
Interlock start
Cooling fan B trip
Cooling fan A running and cooling air hand pressure low
Cooling fan B logic
Interlock stop
Cooling fan motor bearing temperature > x
Interlock start
Cooling fan A trip
Cooling fan B running and cooling air hand pressure low
二十、RUNBACK LOGIC (AS DISCUSS)
More than three pulverizer are running , when any two feeder water pumps or
air heater or air fan or two I.D fans or P.A fan trip ,then RUNBACK happen,
action as below.
(FSSS) RUNBACK ACTION
1. If there are six pulverizers are running , then stop F 、 E and A
pulverizer and start BC oil gun combustion-supporting.
2. If there are five pulverizers are running:
a) If A、B、C、D、E pulverizers are running ,then stop A 、E pulverizer
and start BC oil gun combustion-supporting.
b) If A、B、C、D、F pulverizers are running ,then stop F 、A pulverizer
and start BC oil gun combustion-supporting.
c)
If A、B、C、E、F pulverizers are running ,then stop F 、E pulverizerand start AB oil gun combustion-supporting.
d) If A、B、D、E、F pulverizers are running ,then stop A 、B pulverizer
and start EF oil gun combustion-supporting.
e) If A、C、D、E、F pulverizers are running ,then stop A 、F pulverizer
and start CD oil gun combustion-supporting.
f) If B、C、D、E、F pulverizers are running ,then stop B 、F pulverizer
and start CD oil gun combustion-supporting.
3. If there are four pulverizers are running:
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8/9/2019 FSSS Control
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FSSS DESIGN DESCRIPTION
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a) If A、B、C、D pulverizers are running ,then stop A pulverizer and
start BC oil gun combustion-supporting.
b) If A、B、C、E pulverizers are running ,then stop E pulverizer and
start BC oil gun combustion-supporting.
c) If A、B、C、F pulverizers are running ,then stop F pulverizer and
start BC oil gun combustion-supporting.
d) If A、B、D、E pulverizers are running ,then stop E pulverizer and
start AB oil gun combustion-supporting.
e) If A、B、D、F pulverizers are running ,then stop F pulverizer and
start AB oil gun combustion-supporting.
f) If A、B、E、F pulverizers are running ,then stop F pulverizer and
start AB oil gun combustion-supporting.
g)
If A、C、D、E pulverizers are running ,then stop A pulverizer andstart CD oil gun combustion-supporting.
h) If A、C、D、F pulverizers are running ,then stop F pulverizer and
start CD oil gun combustion-supporting.
i) If A、D、E、F pulverizers are running ,then stop A pulverizer and
start EF oil gun combustion-supporting.
j) If B、C、D、E pulverizers are running ,then stop B pulverizer and
start CD oil gun combustion-supporting.
k) If B、C、D、F pulverizers are running ,then stop B pulverizer and
start CD oil gun combustion-supporting.
l)
If B、C、E、F pulverizers are running ,then stop B pulverizer and
start CD oil gun combustion-supporting.
m) If B、D、E、F pulverizers are running ,then stop B pulverizer and
start EF oil gun combustion-supporting.
n) If C、D、E、F pulverizers are running ,then stop F pulverizer and
start CD oil gun combustion-supporting.
o) If A、C、E、F pulverizers are running ,then stop A pulverizer and
start EF oil gun combustion-supporting.
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