PPT On FURNACE SAFEGUARD SUPERVISORY SYSTEM
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F.S.S.S. facilitates remote manual/automatic control of fuel firing equipments through mechanized system and suitable interlocks/logics.
It is designed to ensure the execution of a safe, orderly operating sequence in start up and shutdown of fuel firing equipments and to prevent errors of omission in following such a safe operating procedure.
2. The system provides protection against malfunction of fuel firing equipment and associated air system.
The safety feature of system are designed for protection in most common emergency situations.
3. F .S.S.S. Equipment can be grouped under three heads
The Operating and Indicating Console This consists of all switches for initiating controls and also indications of status of all fuel firing equipment & their auxiliaries.
2. Relay and Logic Cabinets: The cabinets consists of relays, timers, programmers, circuit breakers for AC and DC control suppliers flame scanner unit, number of coal flow units etc. They control the process logic
4. Field Equipments
Field equipments are those which help in actual remote operation of fuel firing equipments and those which provide the status to the operating console and relay logic cabinet.
Ignitor/H.O Trip Valves,
H.O atomizing steam,
Scavenging atomizing nozzle valve (Hydramotor type),
Gun advance/retract mechanisms,
Oil gun assembly,
Ignitors and its cabinets,
Flame scanner and ignitor air fans,
Pressure switches, temperature switches, flow switches and limit switches,
Mill Discharge valves, hot air gates, sealing air valves, cold air, tramp iron gate etc.
5. Functions of FSSS
To start complete furnace purge when all technological conditions are fulfilled.
To start and monitor ignitors
H.O. guns, (oil guns) starting, stopping and supervision.
Pulveriser and feeder starting, stopping and supervision
Flame scanner intelligence and checking.
Furnace flame monitoring and overall furnace flame failure protection.
6. Functions of FSSS
To start-stop igniter and scanner air fans.
To effect secondary air damper control with indication of auxiliary and fuel air damper modulation/close.
To trip out all boiler fires when boiler safety is threatened
To provide boiler trip signal to other equipments such as P .A. Fan, Turbine, Generator etc.
7. FURNACE PURGE
Purpose: : Complete Removal of unburnt fuel from entire furnace Procedure:
Ensure that all fuel to furnace is cut off and all flame is out
Provide adequate air flow through furnace (30 to 40%)
Initiate a MANDATORY purge time cycle (9 min)
Consequence:
Master Fuel Trip Relays are reset
Firing of fuel into the furnace is allowed
8. Boiler Purge Logic
All HFO nozzle valves are closed
All Pulverizers are off
No MFT condition present
All feeders are off
All scanners sensing no flame.
All auxiliary air dampers modulating Both PA fans off
All HAGs closed
Air flow more than 30% and less than 50%
HFO trip valve is closed
Wind box to furnace DP is adequate.
9. AIR DAMPER-
AIR DAMPER ARE DIVIDED AS FOLLOWS-
1-FIVE ELEVATION OF FOUR SECONDARY AIR.
2- 4 ELEVATION OF 4 AIR TO OIL/S.A.D
3-8 ELEVATION OF 4 AIR TO P.F. BURNER.
4-TWO ELEVATION OF FOUR OVERFIRE AIR.
10. For more please refer our PPT. Thank You.
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FURNACE SAFEGUARD SUPERVISORY SYSTEM Presentation Transcript:
1. FURNACE SAFEGUARD SUPERVISORY SYSTEM F.S.S.S. facilitates remote manual/automatic control of fuel firing equipments through mechanized system and suitable interlocks/logics.
It is designed to ensure the execution of a safe, orderly operating sequence in start up and shutdown of fuel firing equipments and to prevent errors of omission in following such a safe operating procedure.
2. The system provides protection against malfunction of fuel firing equipment and associated air system.
The safety feature of system are designed for protection in most common emergency situations.
3. F .S.S.S. Equipment can be grouped under three heads
The Operating and Indicating Console This consists of all switches for initiating controls and also indications of status of all fuel firing equipment & their auxiliaries.
2. Relay and Logic Cabinets: The cabinets consists of relays, timers, programmers, circuit breakers for AC and DC control suppliers flame scanner unit, number of coal flow units etc. They control the process logic
4. Field Equipments
Field equipments are those which help in actual remote operation of fuel firing equipments and those which provide the status to the operating console and relay logic cabinet.
Ignitor/H.O Trip Valves,
H.O atomizing steam,
Scavenging atomizing nozzle valve (Hydramotor type),
Gun advance/retract mechanisms,
Oil gun assembly,
Ignitors and its cabinets,
Flame scanner and ignitor air fans,
Pressure switches, temperature switches, flow switches and limit switches,
Mill Discharge valves, hot air gates, sealing air valves, cold air, tramp iron gate etc.
5. Functions of FSSS
To start complete furnace purge when all technological conditions are fulfilled.
To start and monitor ignitors
H.O. guns, (oil guns) starting, stopping and supervision.
Pulveriser and feeder starting, stopping and supervision
Flame scanner intelligence and checking.
Furnace flame monitoring and overall furnace flame failure protection.
6. Functions of FSSS
To start-stop igniter and scanner air fans.
To effect secondary air damper control with indication of auxiliary and fuel air damper modulation/close.
To trip out all boiler fires when boiler safety is threatened
To provide boiler trip signal to other equipments such as P .A. Fan, Turbine, Generator etc.
7. FURNACE PURGE
Purpose: : Complete Removal of unburnt fuel from entire furnace Procedure:
Ensure that all fuel to furnace is cut off and all flame is out
Provide adequate air flow through furnace (30 to 40%)
Initiate a MANDATORY purge time cycle (9 min)
Consequence:
Master Fuel Trip Relays are reset
Firing of fuel into the furnace is allowed
8. Boiler Purge Logic
All HFO nozzle valves are closed
All Pulverizers are off
No MFT condition present
All feeders are off
All scanners sensing no flame.
All auxiliary air dampers modulating Both PA fans off
All HAGs closed
Air flow more than 30% and less than 50%
HFO trip valve is closed
Wind box to furnace DP is adequate.
9. AIR DAMPER-
AIR DAMPER ARE DIVIDED AS FOLLOWS-
1-FIVE ELEVATION OF FOUR SECONDARY AIR.
2- 4 ELEVATION OF 4 AIR TO OIL/S.A.D
3-8 ELEVATION OF 4 AIR TO P.F. BURNER.
4-TWO ELEVATION OF FOUR OVERFIRE AIR.
10. For more please refer our PPT. Thank You.
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