When the auxiliary oil-fired boiler is not in service, at sea or in port, it should be maintained in a warm condition by supplying steam to the heating coil in the water drum. This is done by opening the heating coil drain valve and the steam inlet valve. The boiler pressure should be maintained at 0.05MPa or above. When the heating coil is not in use, the steam inlet valve is closed and the drain valve is normally left open.
Issue: Final Draft - November 2011 IMO No: 9431305
Machinery Operating Manual
Maersk Kiera
Section 2.2 - Page of 24 Illustration 2.2.3a Boiler Control Panel
1. Water Level Controller 2. Fuel Oil Temperature Controller 3. Fuel Oil Pressure Controller 4. Atomising Steam Pressure 5. Oil Valves Not In Position 6. High Water Level 7. High Steam Pressure 8. High Oil Temperature 9. Overload Ignition Burner Pump 10. Interlocks OK
11. Flame Failure 12. Low Water Level
13. Overload Combustion Air Fan 14. Low Oil Temperature 15. Lance Not In Position 16. Sequence Failure 17. Low Steam Pressure 18. Too Low Water Level
19. Atomising Steam Pressure Low 20. Low Oil Pressure
21. Fuel Oil Standby Pump Started 22. Fire in Wind Box
23. High Temperature In Uptake 24. Low Combustion Air Flow
25. Automatic Standby Feed Water Pump Started 26. Ammeter No.1 Feed Water Pump
27. Ammeter No.2 Feed Water Pump 30. Ammeter Combustion Air Fan 31. Hour Meter No.1 Feed Water Pump 32. Hour Meter No.2 Feed Water Pump 35. Hour Meter Combustion Air Fan
36. Feed Water Pump No.1 Mode Selector Standby - Off - Manual 37. Feed Water Pump No.2 Mode Selector Standby - Off - Manual 38. Fuel Oil Pump No.1 Mode Selector Standby - Off - Manual 39. Fuel Oil Pump No.2 Mode Selector Standby - Off - Manual 40. Combustion Air Fan Mode Selector Auto - Off - Manual 41. Feed Water Pump No.1 - Stop/Start Pushbuttons 42. Feed Water Pump No.2 - Stop/Start Pushbuttons
43. Fuel Oil Pump No.1 - Stop/Start 44. Fuel Oil Pump No.2 - Stop/Start 45. Combustion Air Fan Run 46. Feed Water Pump No.1 - Standby 47. Feed Water Pump No.2 - Standby 48. Fuel Oil Pump No.1 - Standby 49. Fuel Oil Pump No.2 - Standby 50. Space Heating Feed Pump No.1 51. Space Heating Feed Pump No.2 52. Space Heating Combustion Air Fan
1. Air/Oil Controller
2. Main Steam Pressure Controller 3. Combustion Air Flow Indicator 4. Fuel Oil Flow Indicator
5. Air Flow Setting Potentiometer 0 - 100% 6. Oil Flow Setting Potentiometer 0 - 100% 7. Air/Fuel Ratio Potentiometer -50% - +50% 8. Oil Flow Totaliser
9. Atomising Steam Valve 10. Ignition On
11. Oil Valve Open 12. Steam Purge Valve 13. Burner Normal Stop 14. Combustion Controller Off 15. Ignition Lance Inserted 16. Heavy Fuel Oil 17. Diesel Oil 18. Burner On
19. Chemical Dosing Unit Oil-Fired Boiler 440V 20. Chemical Dosing Unit Oil-Fired Boiler 220V 21. Emergency Operating Mode
22. Control Voltage Selection Switch 23. Control Voltage Indication Lamp 24. Lamp Test Button
25. AUTO / MANUAL Burner Mode Selection Key Switch 26. Sootblower Start/Run 27. Stop Buzzer 28. Buzzer 29. Emergency Stop
CPU Back-up Battery Inside (27A2A)
1. Flame ON Indicator lamp 2. Atomising Steam Valve 3. Ignition
4. Oil Valves Open
5. Oil Valve Closed / Steam Purge
2 1 3 4 1 2 5 6 7 8 9 10 11 12 13 14 18 19 21 23 22 24 26 27 28 25 15 16 17 3 4 5 26 27 30 31 32 35 36 37 38 39 40 46 47 48 49 45 50 51 52 29 AUTOMATIC OPERATION:
Start of Burner (Emergency Operation key switch in position AUTOMATIC)
1. Start Combustion Air Fan on START/RUN if AUTO-MAN switch is selected to MANUAL. 2. Refer to Combustion Mode Instructions for the Burner below for setting of Combustion Control.
3. Select BURNER MODE switch to START/RUN. The Burner will automatically be started and stopped by a signal from the Start/Stop Pressure Switch.
Stop of Burner
1. Select BURNER MODE switch to STOP.
EMERGENCY OPERATION:
Start of Burner (Emergency Key Switch Activated)
1. Select Combustion Air Fan AUTO-MAN switch to Manual and START/RUN switch to START. 2. Select TA1 on Oil/Air Combustion Controller to position AUTO.
3. Adjust Air Flow to Purge position, minimum 50% air flow, by TA2 and TA3. - allow minimum of 60 seconds purge.
WARNING: Insufficient Purging May Cause Danger of Furnace Explosions.
4. The Air and Oil flow to be adjusted to Ignition position, approximately 25% oil flow, by TA2 and TA3. 5. For manual ignition sequence, refer to instructions on local Emergency Box.
6. When the flame is established - supervision is by the emergency flame scanner and air/oil flow to the burner can be adjusted by TA2/TA3 on the Air/Oil Combustion Controller to desired fuel rate.
WARNING: In Emergency Operation the Safety Interlocks are Reduced to Too Low Water Level and Flame Failure.
THEREFORE THE BOILER MUST BE CAREFULLY AND UNINTERRUPTEDLY SUPERVISED BY SHIP'S ENGINEERING PERSONNEL.
Operating Instructions For Burner Stop of Burner
1. Firing is stopped by turning the Emergency Operation Switch to the AUTOMATIC position or by pressing the OIL VALVE CLOSE pushbutton on the Local Emergency Operation Box.
Automatic Cascade Mode (steam load depending firing rate)
1. Select TA1 in position CASC. The master output will be set point for Oil and Air Flow Controllers. 2. Select TA5 in position AIR and TA4 in position AUTO.
3. Select TA5 in position Oil and TA4 in position AUTO. The set point from Master Steam Pressure Controller decides the boiler steam pressure. Air and oil ratio is automatically controlled.
Oil and Air Automatic Mode (constant firing rate)
1. Select TAI in position AUTO. The set point for Oil and Air are selected manually on TA2 and TA3. 2. Select TA5 in position AIR and TA4 in position AUTO.
3. Select TA5 in position OIL and TA4 in position AUTO. The firing rate is selected manually on TA2 and TA3. Air and oil ratio is automatically controlled.
Oil and Air in Manual Mode
1. Select TA5 in position AIR and TA4 in position HAND. 2. Select TA5 in position OIL and TA4 in position HAND.
3. Air flow is increased on TA6 or decreased on TA7 with TA5 in position AIR. 4. Oil flow is increased on TA6 or decreased on TA7 with TA5 in position OIL.
Combustion Mode Instructions For Burner
Burner Emegency Operation Panel (on Burner Unit)
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 1 2 23 24 25 41 42 43 44 5 3 4 20
Issue: Final Draft - November 2011 IMO No: 9431305
Machinery Operating Manual
Maersk Kiera
Section 2.2 - Page of 24
2.2.3 OIL-FIRED BOILER CONTROL SYSTEM
Manufacturer: Aalborg Industries AS, Denmark This system provides operation, control and interlock devices required for the running of the boiler at a steam pressure of 0.70MPa. It performs the automatic and manual operation of the boiler and will give an alarm to warn the operator if an abnormality occurs during operation of the following modes: Emergency/Automatic Mode
A key switch located on the boiler control panel allows the burner to be operated either in Automatic or Manual (emergency) mode. In the manual (emergency) mode the boiler will be operating with reduced safety interlocks. With the automatic sequence controller bypassed, the burner must be operated at the local control position at the boiler top.
Normal 0.7MPa Mode
In this mode the boiler pressure will start to rise and will follow the actual steam load. If the steam demand decreases, and the boiler steam pressure rises to the automatic burner stop point, the burner will cut-out. The burner will remain off until the steam pressure falls to the point of automatic start, which is slightly below the pressure set point. An automatic start will be performed and the boiler pressure will be brought back up to its set point.
Control Panel
The panel contains the controllers, which are electronic microprocessors, and allow automatic/manual operation of output and set point adjustment of the following systems:
Fuel Oil Temperature
This is kept at a steady predetermined value by controlling the steam flow to the fuel oil heaters.
Burner Fuel Oil Pressure
This is required to keep the fuel oil pressure at the desired value and is achieved by controlling the recirculation to the suction side of the oil pumps.
Boiler Water Level
The desired liquid level in the boilers is achieved by controlling the feed water flow to the boiler. (See Section 2.3.4, Boiler Feed Water System.)
Atomising Steam Pressure
To keep the pressure at the preset value, the steam flow is controlled downstream of the control valve.
Main Line Steam Pressure
This is achieved by controlling the oil flow and, in accordance with this, the air flow to the burner.