LNG Steam Simulator Exercise
003. Run the Simulator to Light a Boiler on Diesel Oil
[Load Snapshot "Ex_003_Procedure for lighting boiler on diesel oil" in the Simulator]
- Asssume scenario as described below [but check to confirm] and then follow the given procedures
Electrical Power:-
Shore Power:Off; Emergency Generator:Auto Stand-by; Both Turbo Generators:Off; Diesel Generator:On
Fuel Bunkers:-
All bunker tanks are full; Fuel oil settling tanks are full as well (both for diesel oil & heavy fuel oil).
Water Bunkers:-
All water bunker tanks are full.
Deaerator:-
Full with guage glass reading between 60~70 mm
Both Boilers:-
Full with guage glass reading about -100 mm
Control Air System:-
On - All valves to various services OPEN.
Distilled Water Tank (DWT) & Atmospheric Drain Tank (ADT):-
Both DWT & ADT about 60% full.
>> Procedures for lighting boiler on diesel oil:-
Stbd/ Port Boiler:
1 Check DO nozzles are fitted (light brown square boxes) in FO Burner. If these are dark brown in colour then use Student Actions (Actiotn: Combustion > #322, 324, 326 & 328) to change nozzles.
Emerg Distrib:
2 Close the DO Service Pump circuit breaker.
3 Close the FD Fan #1 circuit breaker if lighting the Stbd Boiler
Main Distrib:
4 Close the FD Fan #2 circuit breaker if lighting the Port Boiler.
5 Close the Burner management circuit breaker for Port/Stbd Boiler.
FO Service:
6 Open the DO Settling Tank outlet valve to the DO Service Pump.
7 Open the DO Service Pump Suction and Discharge Valves.
8 Check the 3-way HO/DO selector valve supplying the boiler is selected to
supply Diesel Oil.
9 Downstream from the HO/DO selector is the Fuel Oil Flow Control valve. This is
remotely controlled by the Fuel Oil PID.
10 Next downstream from the FO Flow valve is the Main Oil Trip Valve (MOTV). This
is controlled remotely by the Burner Management System.
11 Next downstream from the MOTV are two manually operated burner valves - one
for each burner. Open both valves.
12 Downstream from the manual burner valves are the two Burner Oil Trip Valves
(BOTV). Again, the one BOTV for each burner is controlled remotely by the Burner
Management System.
13 Start the DO Service pump.
Comb Air:
14 Start the boiler Forced Draft (FD) fan at the FAST setting.
Comb Ctrlls:
15 Check that the Plant Master controller Set Point (SP) is set to read about 58% on
the left side analog gauge. This corresponds to a working steam pressure of 0.58 x 10342 = 6000 kPa or
1500 psi = 870 psi
16 Set all combustion controllers for the boiler's Master, Fuel, and Air controllers to
AUTO. Note that the Plant Master only operates in AUTO.
17 Check the boiler's Fuel/Air balance controller is set to approximately 50%.
18 To view the status of each controller, click STATUS on the plant master.
Bnr. Mgt Port/Stb:
19 Select Boiler Firing mode to AUTO. This effectively configures the Burner
Management system for Remote Automatic operation.
20 Check that the first three purge permissive lights are illuminated. These are:
a. Main FO Trip Valve (MOTV) closed
b. FO Recirculation Valve Closed
c. All Burner Oil Valves (BOTV) Closed
21 Press the Boiler Firing START button for at least 5 seconds. The ALL BURNER
AIR REGISTERS OPEN lamp will illuminate.
22 Once the green PURGE AIRFLOW SATISFACTORY and PURGE IN PROGRESS
Lights illuminate, the purge sequence commences. After about thirty seconds of
uninterrupted purging, the green PURGE COMPLETE light illuminates.
During the purge process the Burner Management System overrides the Air
Control PID and opens the air damper fully. After the purge is complete, the
PURGE control of the air damper is restored to the Air Control PID. The control
system checks the drum water level and, if satisfactory, illuminates the WATER
LEVEL SATISFACTORY light, opens the Main Oil Trip Valve (MOTV) and gives
PERMISSION TO LIGHT BURNERS. An unsatisfactory water level will cause a
boiler trip.
23 Burner 1 will light automatically and the Left and Right flame scanners for this
burner should show the flickering with an average value of around 5. The flame
scanners will periodically read zero for a few seconds during a self-check.
24 Wait until Burner 1 START light is steady - not flashing.
25 Click Burner 2 START button to light the second burner. The Burner Management
System will automatically open the BOTV for burner2, insert the igniter, ignite the
flame and withdraw the igniter.
26 While Drum Steam Pressure is below 650psi (4,500 kPa) the boiler will operate in
Low Fire Mode as indicated by the COMBUSTION CONTROL IN LOW FIRE lamp.
During this time the fuel and air controllers are overridden by a low set point signal in order to produce low flame intensity and limit the rate of thermal expansion. Note the drum level rises slowly due to thermal expansion.
Stbd/ Port Boiler:
27 Once a positive value of drum steam pressure is established, close the Air Vent. All
the air would have been expelled from the drum by now.
28 Wait for the boiler pressure to reach 1500 kPa (1.5 MPa).
27 Once a positive value of drum steam pressure is established, close the Air Vent. All the air would have been expelled from the drum by now.
28 Wait for the boiler pressure to reach 1500 kPa (1.5 MPa).