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GasKraft
Engineering
06.05.2020 Driving Force Optimization for Sustainable Ships & Power Plants 1
Marine Turbochargers OEM Forum:
Turbocharger technology as a pathway to
lower emissions
One centerpiece of future system architecture
Prof. Dr. Hinrich Mohr
GasKraft
Engineering
06.05.2020 Driving Force Optimization for Sustainable Ships & Power Plants 2
Engine Development Needs – 5 years +
New Engines
Pu
blic
Mar
ine
Turb
och
arge
rs O
EM F
oru
m, 6
May
20
20
• Further increased engine power density
• Lower emissions (CO2, NOx, PM, HC incl. CH4, noise) – worldwide & local specials
• Fuel flexibility (HS-HFO, ULS-HFO, MDO/MGO, GtL, LNG, Methanol, Urea, …)
• Hybrid system operation with increased start/stop and PTO/PTI (at least for 4-strokes)
• Multi-application usage for high-speed and smaller medium-speeds (e. g. Marine, PowerGen,
Rail, Offroad)
• Integrated operation with exhaust aftertreatment equipment
• Optimized part load operation (e. g. by skip-firing)
© AVL
GasKraft
Engineering
06.05.2020 Driving Force Optimization for Sustainable Ships & Power Plants 3
Engine Operation Needs – 5 years +
Existing Engines
Mar
ine
Turb
och
arge
rs O
EM F
oru
m, 6
May
20
20
• Reduction of emissions (CO2, NOx, PM, HC incl. CH4, noise) – worldwide & local specials
• Some fuel flexibility (HS-HFO, ULS-HFO, MDO/MGO, GtL, … LNG, Methanol ???)
• Adaptation / retrofit to fuel operation with lower environmental footprint
• Increased exhaust backpressure from added exhaust gas treatment
• Integration of hybrid system components, so increased start/stop and PTO/PTI (at least for 4-
strokes)
Pu
blic
© Balearia © Fred. Olsen Express
GasKraft
Engineering
06.05.2020 Driving Force Optimization for Sustainable Ships & Power Plants 4
Impact on Turbochargers
Mar
ine
Turb
och
arge
rs O
EM F
oru
m, 6
May
20
20
• Increased performance due to need for higher engine BMEP and engine 'downsizing'
• Higher boost pressures due to reduced engine inlet time slot (Miller timing) for lower NOx
emissions and decreased knock tendency in gas engines
• Impact from increased back pressure due to exhaust aftertreatment systems
• Recirculating exhaust gases for lower NOx emissions
• Speed profile with high fluctuations due to engine start/stop within hybrid systems
Pu
blic
Pre
ssu
re R
atio
πV
1970 2000 20300
12
6
2020
3
9
Limit ?
4-stroke large-bore
engine turbocharging
GasKraft
Engineering
06.05.2020 Driving Force Optimization for Sustainable Ships & Power Plants 5
Impact on Turbochargers
Mar
ine
Turb
och
arge
rs O
EM F
oru
m, 6
May
20
20
From 1-stage to 2-stage ✓ … to 3-stage in 10 years + ???
Pu
blic
© MAN Energy Solutions
GasKraft
Engineering
06.05.2020 Driving Force Optimization for Sustainable Ships & Power Plants 6
Thank you!
Mar
ine
Turb
och
arge
rs O
EM F
oru
m, 6
May
20
20
www.gaskraft-engineering.de
Pu
blic
Boost Your Power. Boost Your Efficiency.
Turbocharger technology as a path to lower emissions
Kompressorenbau Bannewitz GmbH
Florian Hermann, 06.05.2020
▪ Continuous improvement of combustion engines
▪ Increasing charge air pressure requirements
→ single-stage (>5,5:1) and two-stage turbocharging (>10,0:1)
▪ Increased air flow capacity of TC size required for downsizing
06.05.2020Marine Turbochargers OEM Forum: turbocharger technology as a pathway to lower emissions 2
Motivation
Air Flow Rate [m³/s]
Pre
ssure
Ratio [
-]
Diesel mode Gas mode (IMO III)
110%
100%
75%
50%
100%
75%
50%
Dual-fuel engine
PR
ES
SU
RE
RA
TIO
[-]
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
YEAR [-]
2013 2014 2015 2016 2017 2018 2019
PIC mean value of matched single-stage TCs PIC range of matched single-stage TCs
Turbocharger improvements (new ST27-EP series)
06.05.2020Marine Turbochargers OEM Forum: turbocharger technology as a pathway to lower emissions 3
Turbocharger improvements (new ST27-EP series)
06.05.2020Marine Turbochargers OEM Forum: turbocharger technology as a pathway to lower emissions 4
thermomanagement
(pressure ratio)
bearing system
(pressure ratio, flow rate)
compressor housing (flow rate)
Compressor wheel
(pressure ratio, flow rate)
shaft sealing
(pressure ratio, fuel type)
turbine housing (flow rate)
turbine
(pressure ratio, flow rate)
Activities:
▪ Rotor design modification
▪ Component optimization
Performance results:
▪ Increased pressure ratio (6,0:1)
▪ Optimization of weight and inertia
06.05.2020Marine Turbochargers OEM Forum: turbocharger technology as a pathway to lower emissions 5
Turbocharger key component developments
Activities:
▪ Rotor design modification
▪ Component optimization
Performance results:
▪ Increased pressure ratio (6,0:1)
▪ Optimization of weight and inertia
▪ Extended range of maximum
efficiency at higher pressure ratio
06.05.2020Marine Turbochargers OEM Forum: turbocharger technology as a pathway to lower emissions 6
Turbocharger key component developments
ST27
etaisC,max
ST27-EP
etaisC,max
Activities:
▪ Rotor design modification
▪ Component optimization
Performance results:
▪ Increased pressure ratio (6,0:1)
▪ Optimization of weight and inertia
▪ Extended range of maximum
efficiency at higher pressure ratio
▪ Increased compressor flow capacity
▪ Increased turbine flow capacity and
efficiency
06.05.2020Marine Turbochargers OEM Forum: turbocharger technology as a pathway to lower emissions 7
Turbocharger key component developments
Boost Your Power. Boost Your Efficiency.
Thank you for your attention.Your contact at KBB:
Florian HermannKey Account Manager
End Customers
+49 175 4877 092
+49 351 4085 613
http://kbb-turbo.com
