TEMPERATURE MEASUREMENT

FURNACE SAFEGAURD SUPERVISORY SYSTEM-1 For PULVARISED COAL FIRED BOILER

BYASHVANI SHUKLAMANAGER(C&I)RELIANCE

IndexCommon Logic 1.MFT 2.Furnace Purging 3.Oil Leak Test 4.OFT 5.Oil System Normal 6.Furnace Firing permissive Condition 7.Runback 8.Post trip purge excursion protection

1.MASTER FUEL TRIP(MFT)Any following condition generate, touch off MFT or generate the pulse or PF contact.1. Manual MFTBoth MFT pushbuttons are depressed at the same time.Two signals are to trip MFT cabinet. Two signals (AND) are to DCS system to trip.2. Both FDFs trippedFD Fan 1 tripFD Fan 2 trip

3.Both ID Fans tripped. 1.ID Fan 1 tripped. 2.ID Fan 2 tripped.4. Both APHs tripped. 1.APH A pass should be tripped 2.APH b pass should be tripped.5. All BFP tripped. 1.BFWP 1 tripped.(TD) 2.BFWP 2 tripped.(TD) 3.BFWP 3 tripped.(MD)6. Lost primary air : Both PAFs tripped when any mill in service. 1.PA Fan 1 tripped. 2.PA Fan 2 tripped.

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7.Lost Flame Scanner cooling air.Both cooling air fans tripped or outlet main pipe press LL 2/3, with delay of 10s.8. Total airflow is