Turbocharger Cut Out System (2)
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© MAN Diesel [current topic] 2009/04/01 © MAN Diesel [current topic] < 1 > Turbocharger Cut-out System Torben Wiik Project Engineer Special Projects/ PrimeServ Copenhagen
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Transcript of Turbocharger Cut Out System (2)
2009/04/01© MAN Diesel [current topic] 2009/04/01© MAN Diesel [current topic] < 1 >
Turbocharger Cut-out System
Torben Wiik
Project Engineer
Special Projects/ PrimeServ Copenhagen
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 2 >
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 3 >
WHY ?
To lower the fuel consumption and improve the main
engine performance during low load operation on large
container vessels
26
Ship speed
knot25242322212019
Relative propulsion power needed
120
%
110
100
90
80
70
60
50
40
18
30
Speed reduction ?
25 knots refers to 100%
relative propulsion power.
A reduction of 5 knots will
result in a requirement of 41%
propulsion power
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 4 >
164
166
168
170
172
174
176
178
180
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
g/kWh
Engine Load %
Fuel oil consumption
Standard
1 of 3
1 of 4
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 5 >
Scavenging air receiver
Cooler
Exhaust gas receiver
Cooler Cooler
T/C cut-out:
1 of 1 T/C, VTA option
1 of 2 T/C, VTA option
1 of 3 T/C
1 of 4 T/C
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 6 >
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
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Pneumatically
operated swing gates
valve for the gas
side.
Height = 1.5 metres
Weight = 850 kg
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 8 >
Safety and Control Aspects
1. T/C overspeed due to too high engine load.
2. Engine running with compressor closed and turbine open
1. Limits for index and rpm
2. Monitoring of locking pins and position
sensors
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
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NOx
g/kWh
25% 50% 75% 100% Power
IMO Cyclevalue = 5%*NOx(25%) + 11%*NOx(50%) + 55%*NOx(75%) + 29%*NOx(100%)
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 10 >
25% 50% 75% 100% Power
NOx
g/kWh
↑ Pscav → Pcomp ↑ → Pmax ↑ by increased T/C efficiency
25% 50% 66% Power TC cut-out
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 11 >
25% 50% 75% 100% Power
NOx
g/kWh
25% 50% 66% Power TC cut-out
oo
o o
2009/04/01© MAN Diesel [current topic] < 12 >
Turbocharger Cut-out System
If the NOx cycle value stated in the original Technical File is below 16.2 g/kWh.
It requires an approval from the Class and an amendment to the Technical File.
NOx cycle value stated in original Technical File
If the NOx cycle value stated in the original Technical File is above 16.2 g/kWh.
It requires a new Technical File amended with new performance and NOx values.
2009/04/01© MAN Diesel [current topic]
Turbocharger Cut-out System
< 13 >
Fuel Savings
164
166
168
170
172
174
176
178
180
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
g/kWh
Engine Load %
Fuel oil consumption
Standard
1 of 3
1 of 4
12K98ME-C7 74760 kW
3 turbochargers: Approximately 2 to 2.7 tons/day
4 turbochargers: Approximately 3 to 4.5 tons/day
