Sub

1. START UP BURNERS
FEB 2016
TAPAN JAYSWAL

2. Table of Content
INTRODUCTION
1
2 ST/U PERMISSIVES
3 PROTECTION STOPS
2
4 SUMMARY
5 Q & A

3. 3
1. INTRODUCTIONS

4. 1. SUB SYSTEM
4
DISPLAY OF SUB

5. 1. INTRODUCTION
5
HFO details

6. 1. INTRODUCTION
6
LDO details

7. 1. INTRODUCTION
7
General Arrangement
o LDO is used for initial start-up only
o HSD is used for flame stabilization & during partial load operations
500 KL x 2 Nos
8.9 mtr
8.6 mtr
250 KL x 2 Nos
7.0 mtr
7.4 mtr

8. 1. INTRODUCTION
8
General Arrangement
Top View
Front View

9. 1. INTRODUCTION
9
SUB on LDO or HFO or on both or ……
 The Start up burner system consists of four no of wall burners located two each on front and
rear pant legs of the combustor, facing towards the bottom of the combustor.
 These burners are capable of burning LDO with air atomization or HFO with steam atomiza
tion as fuel.
 However at a time one fuel alone is permitted in the burner.
 Combination of fuels firing ie one SUB with LDO and other SUB with HFO is possible.
 SUB –I to be started with LDO firing, and continued the boiler light up along with Bed Lan
ces firing with HFO.
 Alternately the LDO firing in SUB1 can be switched over to HFO firing, as soon as the HF
O temp, heated by AUX. steam, found O.K.
 The respective SUB I can be switched over to HFO firing by shut down and then restarted
with FO fuel selection.

10. 1. INTRODUCTION
10
SUB & Purge
FG Boiler Purge is to be completed before start up the SUB – I. This is a NFPA statutory and s
afety requirement.
Purge is applicable at any one of the following conditions.
 Before the first start up of the SUB,
 After four successive unsuccessful starting of the first burner (SUB I )
 Burner start beyond 30 min. from the completion of the purge.
 Boiler hot start up when combustor temp < 593 C

11. 2. ST/U PERMISSIVES
11

12. 2. ST/U Permissive
12
Permissive
 Boiler protection SU Burners not acted.
 Any one ID FAN in service.
 Any one Purge & Seal air Blower in service.
 Any one SA FAN in service.
 SUB-I comb air damper not close (1HJL11 CG1O1B)
 Any one PA FAN in service.
 PA FLOW > MIN. -1 50 Kg/cm2
 Purge completed or combustor temp >490 C or any of the other three burners in service si
gnals available*
 LDO / HFO firing selected in DCS
 LPG PR. O.K. (1HJG60 CP002)>2.9 Kg/cm2
 LDO SUB-1 START command (manual)

13. 2. ST/U Permissive
13
Permissive
IF LDO SELECTED
 LDO PUMP PR. CONTROLLER IN AUTO (0HJF14 AA001)
 LDO PR. O.K. (1HJF60 CP001)
IF HFO SELECTED
 HFO PUMP I / II RUNNING (0HJF21 AP001 /0HJF22 AP002 )
 HFO PUMP OUTLET PR. CONTROLLER IN AUTO (0HJF34 AA001)
 HFO PR. O.K. (1HJF70 CP001)
 HFO TEMP. O.K. (1HJF70 CT001/002/003) 2 OF 3
 ATO STM PR O.K. (1HJT70 CP001)
 SUB-1 SCVANGE VLV CLOSED (1HJN61 CG102B)

14. 2. ST/U Sequence
14
Sequential Operation
LDO FIRING
1. SET SUB-1 Comb. Air DAMPER Controller to AUTO (1HJL11 AA001)
2. LPG VENT VLV CLOSE (1HJG60 AA402)
3. LPG MASTER TRIP VLV OPEN (1HJG60 CG101A)
4. LPG BURNER TRIP VLV OPEN (1HJG61 CG401A)
5. LPG IGNITOR ON (1HJG71 AV001)
IF FLAME ESTABLISED (Flame Scanner 1HJF71 CR001)
6. ATO AIR TRIP VALVE OPEN (1HJN 61 CG101A)
7. ATO AIR PR CONTROLLER AUTO (1HJN61 AA001)
8. LDO MASTER TRIP VALVE OPEN (1HJF60 AA101)
9. LDO BNR TRIP VALVE OPEN (1HJF61 CG101A)
10. LPG MASTER TRIP VLV CLOSE (1HJG60 CG101B)
11. LPG BURNER TRIP VLV CLOSE(1HJG61 CG401B)
12. LPG IGNITOR OFF (1HJG71 AV001)
13. LPG VENT VLV OPEN(1HJG60 AA401A)

15. Combustor
Pilot
MTV
Pilot
Vent VV
Pilot
BTV
ATM
BTV
ATM
PCV
LDO
BTV
LDO
PCV
LDO
MCV
Animated Sequence