FUEL GAS HANDLING SYSTEMAND BOG RELIQUEFACTION
FOR LNG CARRIEREIRIK MELAAEN
WÄRTSILÄ OIL & GAS SYSTEMS AS
1 © Wärtsilä 12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen
Wärtsilä Oil & Gas Systems
Agenda:• BOG Reliquefaction plant• Low Pressure Gas to Engine(e.g. DFDE, 2-Stroke DFE) and BOG
Reliquefaction System• High Pressure Gas to Engine(Gas Diesel Engine) and BOG
Reliquefaction System• Future concepts
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen2 © Wärtsilä
Our Expertise in the Gas Value Chain
Exploration &development
ProductionFPSOFlare recoveryOil separation
LNG carrier
LNG liquefaction& terminal
Distribution & transportPower generation
Oil tankerwith VOC
Exploration & Drilling
Production & liquefaction
Transport & storage
Receiving terminals &
regasification
Distribution & transport to the
users
• LNG fuel gas systems for OSVs
• Gensets
• LNG fuel gas systems• LPG, LEG & LNG cargo
handling
• On- & Offshore small scale liquefaction
• Antiflaring/VOC• Oil separation• Gas FPSO
• Jetty & Floating regasification
• Bunkering & barges• Receiving terminals
• Gas/LNG distribution/logistics
• Feed gas to Power plants
LNG bunkering& barges
LNG fuelledvessels
Regasification(FSRU/JRU)
Small scale liquefaction plants
LNG/LBG
LNG receiving terminal
Re-liquefaction of Boil Off Gas,
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen3 © Wärtsilä
• First free-standing small scale LNG plant in Northern Europe delivered March 2003.
• Hamworthy EPCIC contract with GASNOR.
• Technology feasibility and robustness thoroughly and successfully demonstrated.
35 LNG BOGReliquefaction systems
Kollsnes II LNG
• 2 x capacity of existing Linde plant (Kollsnes I).
• Hamworthy EPCIC contract with GASNOR.
• Full production August 2007.
Al Gattara (Hyundai) BOG ReliquefactionSystem (58,000 tpy )
Kollsnes II (Gasnor) LNG Plant(84,000 tpy )
Snurrevarden LNG Plant(22,000 tpy )
LNG Technology Development
Wärtsilä (Hamworthy) LNG process history
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen4 © Wärtsilä
BOG RELIQUEFACTION PLANTBOG RELIQUEFACTION PLANT
BOG to Engines or Returned to Tank
Different solutions available for LNG carrier propulsion:1. Use BOG & LNG as fuel e.g steam turbines, dual-fuel diesel electric, dual-fuel engines
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen6 © Wärtsilä
Pattern for ship’s using BOG & LNG as fuel for propulsion
Laden BallastBallast
Maximum(Laden voyage)
Minimum(Ballastvoyage)
LNG level in tanks
Minimum heel required for cool down of tanks
Fuel used during roundtrip(Natural BOG & forced)
Additional LNG delivered with full BOG Reliquefaction System
2. BOG reliquefaction, liquefy and sell excessive BOG or all LNG loaded onboard
Boil-off gas from cargo tanks vs. Fuelgas required by the engine
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen7 © Wärtsilä
Speed of the Vessel (knots)
Boi
l-off
Gas
(kg/
hr)
Available BOG
BO
G c
onsu
med
in
the
engi
neE
xces
sB
OG
ForcedLNG
Balance between Vessel speed and BOG flow
Avai
labl
e B
OG
Boil-
off g
as
BOG Reliquefaction System (LNGRS – Mark III)No feeding of gas to engines (QFLEX vessels)
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen8 © Wärtsilä
Mark III layout/QG
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen9 © Wärtsilä
Cold box
Typical dimensions: 30 x 22,5 x 7 m (L x W x H)Equipment weights: 240 ton
LNG pump skid N2
reserviorN2 supply skid
BOG compressorsPre-heater
N2 companders
N2 companders
ENGINES REQUIRING LOW ENGINES REQUIRING LOW PRESSURE GAS PRESSURE GAS (DFDE, 2(DFDE, 2--STROKE DFE)STROKE DFE)
AND BOG RELIQUEFACTION AND BOG RELIQUEFACTION PLANTPLANT
Boil-
off g
as
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen11 © Wärtsilä
LP-compressor
BOG Reliquefaction System (LNGRS)Low-Pressure Fuel Gas Supply System (LP FSSS)
Wärtsilä Oil & Gas Systems AS
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen12 © Wärtsilä
Dual-fuel propulsion system
ENGINES REQUIRING HIGH ENGINES REQUIRING HIGH PRESSURE GAS PRESSURE GAS ((GasGas Diesel Diesel EngineEngine))
AND BOG RELIQUEFACTION AND BOG RELIQUEFACTION SYSTEMSYSTEM
BOG Reliquefaction System (LNGRS)High-Pressure Fuel Gas Supply System (HP FGSS)
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen14 © Wärtsilä
HP-pump and Optimizer
PFD – Vaporization System
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen15 © Wärtsilä
TO GAS ENGINE
HP PUMP
BRINE PUMP
LNG VAPORIZER
STEAM/HOT WATERHEATER
HIGH PRESSURE GASOR LNG FROM CARGO TANKSCONDENSATE FROM BOG RS
Temprature: 45 ±10°CPressure: Max 300 bar
Temprature: -160°CPressure: 3-5 bar
HP LNGpump (2)
Brine heater (1)
Brine circulationpump (2)
Pulsedamper (1)
Suctiondrum (1)
LNG vaporizer (1)
Updated Arrangement - Gas Supply System
Typical dimensions: 7 x 3 x 2 m (L x W x H)Equipment weights: Ca 25 ton
HP LNGpump (2)
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen16 © Wärtsilä
BOG Reliquefaction System (LNGRS)High-Pressure Fuel Gas Supply System (HP FGSS)
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen17 © Wärtsilä
HP-compressor and HP-pumpLNGRS for excessive BOG?
Wärtsilä Oil & Gas Systems AS
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen18 © Wärtsilä
Layout – Burckhardt compressors + BOG Reliq plant
Typical dimensions:30 x 22,5 x 7 m (L x W x H)
FUTURE CONCEPTSFUTURE CONCEPTSNEW MRNEW MR
TWO REFERENCES:TWO REFERENCES:NEW MR DEMONSTRATION PLANT NEW MR DEMONSTRATION PLANT –– 2,5 TON/DAY2,5 TON/DAY
NEWMR EGE PLANT NEWMR EGE PLANT –– 11 TON/DAY11 TON/DAY
Demonstration plant – 2,5 ton/hr
12 November 201320 © Wärtsilä Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen
New MR Process Overview
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen21 © Wärtsilä
Pictures EGE - Project
12 November 201322 © Wärtsilä Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen
Flow Sheet of Liquefaction Plant
12 November 201323 © Wärtsilä
H2O & CO2removal
LNG tank
Gas pre-
cooling
Cold Box
MR refrigeration
unit
Pre Cooling system
Main biomethane flow
Mixed refrigerant (MR) flow
CO2 from stripper column
Glycol cooling from pre-cooling unit
Return gas truck loading
Export LNG pump
Gas return from trucks
Raw gas inlet
To flare gas systemExpansion
Flare gas
H2O &
CO2
Pretreatment Liquefaction process
Storage system
LBG Truck Filling station
Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen
BOG Reliquefaction System (LNGRS)
NewMR LP-Pressure Fuel Gas Supply System (LP FGSS)Compressor and Forcing VaporizerLNGRS for excessive BOG
12 November 2013 Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen24 © Wärtsilä
Summary – Wärtsilä NewMR technology
BOG reliquefaction system on LNG vessels in the future
NewMR Why?• Demonstration plant proven
to be successful– Robust– Low OPEX– Load variations
• Robust main rotating machinery with high efficiency
• Designed for unmanned operation
• Shorter delivery time• Simple energy supply,
only electric power needed• Easy and quick start up and
shut down of all systems• Standardisation of
capacities: 1,5 ton/hr, 2,5 ton/hr etc.
• Supplied as modules• Refrigerant process with
phase changes which reduce the size of equipment and piping
• Simplified maintenance• Reduced CAPEX compared
to Nitrogen loop• Two references
12 November 201325 © Wärtsilä Fuel Gas Handling System and BOG Reliquefaction for LNG Carrier_Eirik Melaaen
EIRIK MELAAENEIRIK MELAAENBusiness DevelopmentBusiness Development ManagerManagerTel:Tel: +47 66 10 95 66+47 66 10 95 66Mobile: +47 959 67 377Mobile: +47 959 67 377Fax:Fax: +47 815 48 510+47 815 48 510EE--mail: mail: [email protected]@hamworthy.comWeb:Web: http://www.hamworthy.comhttp://www.hamworthy.com
Thank you for your attention!
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