Flame failure ppt of 600 MW BHEL unit operation department

600 MW flame failure ppt

1. Discussion on Boiler Protection on following points & its logics Flame Failure Loss of all fuel Reheater Protection Loss of 110 volt ac loss of fire ball Water circulation not correct

2. Flame Failure ARMING :- Any Feeder A,B,C,D,E,F,G,H proven TD 2 second ACTS over Flame failure Armed AND All Elevation (ABCDEFGH) Voted no flame

3. Use full basic Gates and its truth Table we using

4. No voting condition for elevation A Feeder A is not proven for >2 sec OR Elevation AB started & loss of 220 V DC power for >2 Sec. OR (Elevation –AB, 3 out of 4 fire ball scanner shows no flame AND Elevation –AB, 2out of 4 Nozzle valve not open)

5. No voting condition for elevation B Feeder B prove for > 2 sec OR (Elevation- BC 3 out of 4 fireball scanner shows no flame AND Elevation- AB started and loss of 220V DC loss for >2 sec ) OR Elevation –AB 3 of 4 fire ball scanner show no flame AND Elevation –AB 2 of 4 nozzle valves not open

6. No voting condition for elevation C Feeder C prove for > 2 sec OR (Elevation- BC 3 out of 4 fireball scanner shows no flame AND Elevation- CD started and loss of 220V DC loss for >2 ssec ) OR Elevation –CD 3 of 4 fire ball scanner show no flame AND Elevation – CD 2 of 4 nozzle valves not open

7. No voting condition for elevation D Feeder D prove for > 2 sec OR (Elevation- DE 3 out of 4 fireball scanner shows no flame AND Elevation- CD started and loss of 220V DC loss for >2 ssec ) OR Elecation –CD 3 of 4 fire ball scanner show no flame AND Elecation – CD 2 of 4 nozzle valves not open

8. No voting condition for elevation A Feeder E prove for > 2 sec OR (Elevation- DE 3 out of 4 fireball scanner shows no flame AND Elevation- EF started and loss of 220V DC loss for >2 sec ) OR Elevation –EF 3 of 4 fire ball scanner show no flame AND Elevation –EF2 of 4 nozzle valves not open

9. No voting condition for elevation F Feeder F prove for > 2 sec OR (Elevation- FG 3 out of 4 fireball scanner shows no flame AND Elevation- EF started and loss of 220V DC loss for >2 ssec ) OR Elevation –EF 3 of 4 fire ball scanner show no flame AND Elevation –EF2 of 4 nozzle valves not open

10. No voting condition for elevation G Feeder G prove for > 2 sec OR (Elevation- FG 3 out of 4 fireball scanner shows no flame AND Elevation- GH started and loss of 220V DC loss for >2 sec ) OR Elevation –GH 3 of 4 fire ball scanner show no flame AND Elevation –GH 2 of 4 nozzle valves not open

11. No voting condition for elevation H Feeder H prove for > 2 sec OR Elevation- GH started and loss of 220V DC loss for >2 sec ) OR Elecation –GH 3 of 4 fire ball scanner show no flame AND Elecation –GH 2 of 4 nozzle valves not open

12. AB CD EF GH A B C F G H D E Feeder A Proven/EL-AB 220 V avlb /EL -AB 2 of 4 LONV open & EL-AB 3 of 4 scanner show fire Feeder H Proven/EL-GH 220 V avlb /EL -GH 2 of 4 LONV open & EL-AB 3 of 4 scanner show fire Feeder B proven / (EL-BC 3of 4 scanner show fire& EL AB 220 V Dc AVLBL)/ EL-AB 2of 4 LONV open & EL-AB 3 of 4 scanner show flame Feeder C proven / (EL-BC- 3of 4 scanner show fire& EL CD 220 V Dc AVLBL)/ EL-CD 2of 4 LONV open & EL-CD 3 of 4 scanner show flame Feeder D proven / (EL-DE- 3of 4 scanner show fire& EL CD 220 V Dc AVLBL)/ EL-CD 2of 4 LONV open & EL-CD 3 of 4 scanner show flame Feeder E proven / (EL-DE- 3of 4 scanner show fire& EL EF 220 V Dc AVLBL)/ EL-EF 2of 4 LONV open & EL-EF 3 of 4 scanner show flame Feeder F proven / (EL-FG- 3of 4 scanner show fire& EL EF 220 V Dc AVLBL)/ EL-EF 2of 4 LONV open & EL-EF 3 of 4 scanner show flame Feeder G proven / (EL-FG- 3of 4 scanner show fire& EL GH 220 V Dc AVLBL)/ EL-GH 2 of 4 LONV open & EL-EF 3 of 4 scanner show flame

13. 220v dc use to control signaling relay tripping closing operating of switchgear 110 V AC use to operate solenoids valves like LONV, ANVs & igniter 24 dc for DCS and MFT all 3 channel supplies and operation

14. RH protection Arming Boiler pressure >8 kgs AND Boiler on (feeder /gun in service) AND HP/LP bypass open &< 2% ACTs 1.Turbine trips OR generator circuit breake r open AND HP/LP bypass openning <2% 2. Turbine working ( HP &IP CVs opening less than 2%) AND LSR turbine load shedding relay operates AND HP/LP bypass open & < 2 % 3. Turbine not workinng & boiler working with 2 gun proven AND HP/LP bypass open & < 2%

15. Loss of all fuel Arming Any Elevation oil nozzle valve not closed AND MFT reset >2 sevc Acts Loss of all Fuel armed AND All feeder off AND ALL elevation LOTV not open OR all feeder backup trip & lonv closed

16. 220v dc use to control signaling relay tripping closing operating of switchgear 110 V AC use to operate solenoids valves like LONV, ANVs & igniter 24 dc for DCS and MFT all 3 channel supplies and operation

17. LESS than fire ball & loss of 110 AC any Elevation is in service All feeder off AND Any Elevation ABCDGH started & loss 0f 110 AC TD >2 sec