2006/09/09 MAN Diesel A/S
FUEL OIL SYSTEM
2006/09/09 MAN Diesel A/S
Performance Fuel Valve Design
L/9902-3.1/0202 (2410/SBJ)
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
Performance
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
K98MC-C Atomizer.
Transparent view Outside view Inside view
2006/09/09 MAN Diesel A/S
Marks and Stamps on Fuel Valve NozzleMC and MC-C Type
Marking must, as a minimum, consist of: Name, IMO id No. and nozzle size.
Name: Manufacturers name/ trade mark
IMO id No.: A unique identification No. which links the componentwith the design specification that was used at the time of manufacture, eg. MAN B&W part No. or licensees drawing No.
Nozzle size: Diameter of nozzle hole.
Example of marking:
The example shows how to mark a nozzle with hole diameter 1.5 mm. with Part No. 1261573-1
2006/09/09 MAN Diesel A/S
Spindle Guide for Slide Valve
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
Compound Fuel Valve Nozzle.
2006/09/09 MAN Diesel A/S
CFD Calculated Temperatures
Boundary conditionfor FEM analysis
2006/09/09 MAN Diesel A/S
L/74071-7.0/0302 (2410/SBJ)
K90MC Nozzle
Steel nozzle BWPS1 nozzle
CFD calculatedtemperature field
Measuredtemperature field
2006/09/09 MAN Diesel A/S
Vacuum Brazingof Compound Fuel Valve Nozzle
Brazing preparation Vacuum brazing Nozzle blank
Inconelpowder
Brazingalloypowder
Brazing alloy powderInfiltrating Inconel powder
H13 tool steel H13 tool steel
2006/09/09 MAN Diesel A/S
Compound Fuel Valve Nozzle
25000 blanks are produced
Approximately 50 % are in service
Not a single fracture has been experienced
Standard on all new engines
All slide valve atomizer Compound in the future
2006/09/09 MAN Diesel A/S
Fuel system development
Twin row slide valve
2006/09/09 MAN Diesel A/S
Slide Valve Pressure Testing
Risk of seizure
3-5
4
1-2
Avoid atomisation test because of:
1. Small lift
2. Large pressure drop
3. High contact pressure
4. High frequency
5. Thin oil
L/74231-2.0/0402 (2300/MCJ)
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
Obel P. adapter
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
Fuel Valve Comparison K90MC
L/73504-0.0/1002 (2000/CEE)
Conventional Fuel Valve Slide Fuel Valve
6334 hours6334 hours
2006/09/09 MAN Diesel A/S
Fuel Valve Comparison K90MC
Conventional Fuel Valve Slide Fuel Valve
6334 hours 6334 hours
L/73503-9.0/1002 (2000/CEE)
2006/09/09 MAN Diesel A/S
Fuel Valve Comparaison K90MC
Mini Sac Fuel Valve Slide Fuel Valve
Liner wear: 0.06 mm/1000h
6334 hours
Liner wear: 0.03 mm/1000h
6334 hours
L/72950-2.0/0202 (2400/ALO)
2006/09/09 MAN Diesel A/S
Service ExperienceK90MC after 6,334 Hours
L/70568-2.0/0100 (2430/DT)
Exhaust gas ductMini-sac
Slide Valve
2006/09/09 MAN Diesel A/S
SLIDE VERSUS CONVENTIONAL
L/72517-8.0/0102 (3001/UM)
Slide fuel valves Conventional fuel valves
2006/09/09 MAN Diesel A/S
Performance of Fuel Valve
L/71261-8.1/0100 (3210/PYJ)
Slide-type fuel valve (890 h after installation)
Conventional valve
2006/09/09 MAN Diesel A/S
Performance
L/71173-2.1/1000 (3210/PYJ)
Fuel oil valve, conventional nozzle
M/V Don Juan Exhaust valve cylinder 2Before installation of slide valve
2006/09/09 MAN Diesel A/S
7S50MC-C Slide Fuel Valves
350370390410430450470490510530550
SeatBottom
Conventional MiniSac SlideC
Combustion chamber temperaturesLiner
L/73093-9.0/0602 (2430/NK)
BottomSeal
2006/09/09 MAN Diesel A/S
7S50MC-C Slide Fuel Valves
150
200
250
300
350
400
3 h=55 mm 5 h=123 mm
Conventional MiniSac SlideC
Combustion chamber temperaturesLiner
L/73092-7.0/0602 (2430/NK)
3 5
2006/09/09 MAN Diesel A/S
7S50MC-C Slide Fuel Valves
240
260
280
300
320
340
360
380
400
Middle 3 R= 84 5 R=137 7 R=180 9 R=232
Conventional MiniSac SlideC
Combustion chamber temperaturesPiston
L/73091-5.0/0602 (2430/NK)
Middle3
57 9
2006/09/09 MAN Diesel A/S
7S50MC-C Slide Fuel ValvesComparison of hydrocarbons (HC)
0
200
400
600
800
1000
100755025
Conventional MiniSac SlideHC (dry 15% O2)
Load [%]
L/73090-3.0/0602 (2430/NK)
2006/09/09 MAN Diesel A/S
7S50MC-C Slide Fuel ValvesComparison of CO
0
10
20
30
40
50
60
70
100755025
Conventional MiniSac SlideCO (dry 15% O2) [ppm]
Load [%]
L/73089-3.0/0602 (2430/NK)
2006/09/09 MAN Diesel A/S
Bosch smoke numbersEngine: 6L60MC/ME Bow Cecil
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 25 50 75 100
Engine power [%]
Bosch number
6L60MC Conventional valves6L60ME Slide valves
Fuel Valve Comparison
L/72818-6.1/0309 (2430/NK)
2006/09/09 MAN Diesel A/S
Slide-type Fuel Valves versus Conventional Fuel Valves
Lower emissions- Reduced Bosch number (BSN10)- HC and CO emissions reduced by 30%
and 40%, respectively- Nox reduction- Co2 reduction
Cleaner combustion- Improved cylinder condition and TBO- Reduced LOC - Reduced deposits
L/72858-1.0/0202 (3001/DT)
2006/09/09 MAN Diesel A/S
Clean after 3,900 hours.
2006/09/09 MAN Diesel A/S
Tightening torque for engines up to 70MC = 60Nm
For large bore above 70MC = 65Nm
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
8S60MC
8S60MC total 43,000 hSlide fuel valves 13,000 hMax. 2mm burning
2006/09/09 MAN Diesel A/S
Slide Fuel Valve
Condition after 36,811 hours on 12K90MC-C.
At 25,360 hours, change to slide fuel valves, at that time
max. burned area 130 x 80 x 4,5 mm
After 11,451 hours with slide fuel valves,
max. burned area 145 x 100 x 4.7 mm
2006/09/09 MAN Diesel A/S
8S60MC total 43,000 hSlide fuel valves 13,000 hMax. 2mm burning
2006/09/09 MAN Diesel A/S
8S60MC total 43,000 hSlide fuel valves 13,000 hMax. 2mm burning
2006/09/09 MAN Diesel A/S
CAT FINES
2006/09/09 MAN Diesel A/S
Cat fines in 50 automatic filter
2006/09/09 MAN Diesel A/S
Abrasive wear
2006/09/09 MAN Diesel A/S
Wrong Nozzel.
Over Heating.
2006/09/09 MAN Diesel A/S
Wrong Nozzel.
Banana Burnings.
2006/09/09 MAN Diesel A/S
Heat Cracks in Ring Land.
2006/09/09 MAN Diesel A/S
Overheated Ringpack due to
wrong nozzels.
2006/09/09 MAN Diesel A/S
Typical
Blow-ByCrack.
2006/09/09 MAN Diesel A/S
Conventional valve.
2006/09/09 MAN Diesel A/S
2006/09/09 MAN Diesel A/S
FUEL PUMP SHOCK ABSORBER
In a few cases cracks have appeared inthe sealing ring groove of the housing
In certain cases the guide ring actsas a tight sealing ring because thehigh running temperature reducesthe ring gap to almost nothing
A pressure of approx. ten times thenormal working pressure is thenBuilt up, hence causing the cracks
The problem was solved by exchangingthe guide ring with a new ring withlarger gap
2006/09/09 MAN Diesel A/S
MODIFICATIONS OF SHOCK ABSORBER
2006/09/09 MAN Diesel A/S
WILL CONTINUE
2006/09/09 MAN Diesel A/S
Function of Super Vit.
When the compression pressure is of a value corrosponding to
app 45% of load, the Super-Vit start to change the Lead Angel so
the injection starts earlier. This change in lead angel to earlier
injection continues until the pressure differense between combustion pressure
and compression pressure is max 35bar at app. 85% of Engine load..
At 85% of Engine load, the max pressure is now 100%.
When increasing to 100% Engine load, the Super-Vit retard the injection
again, so the combustion pressure during the increase is kept at 100%,
even due to the delaied injection, wich should lower the combustion pressure.
The increase in compression pressure compensates for the later injection
and keeps the combustion pressure constant at 100%.
FUEL OIL SYSTEMPerformance Fuel Valve DesignK98MC-C Atomizer. Marks and Stamps on Fuel Valve Nozzle MC and MC-C TypeSpindle Guide for Slide ValveCompound Fuel Valve Nozzle.CFD Calculated TemperaturesK90MC NozzleVacuum Brazing of Compound Fuel Valve NozzleCompound Fuel Valve NozzleFuel system developmentSlide Valve Pressure TestingObel P. adapterFuel Valve Comparison K90MCFuel Valve Comparison K90MCFuel Valve Comparaison K90MCService ExperienceK90MC after 6,334 HoursSLIDE VERSUS CONVENTIONALPerformance of Fuel ValvePerformance7S50MC-C Slide Fuel Valves7S50MC-C Slide Fuel Valves7S50MC-C Slide Fuel Valves7S50MC-C Slide Fuel Valves7S50MC-C Slide Fuel ValvesFuel Valve ComparisonSlide-type Fuel Valves versus Conventional Fuel ValvesClean after 3,900 hours.8S60MCSlide Fuel ValveCAT FINES Cat fines in 50 automatic filterAbrasive wearConventional valve.FUEL PUMP SHOCK ABSORBERFunction of Super Vit.
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