© Siemens AG 2010. All rights reserved.© Siemens AG 2010. All rights reserved.
LNG16X-pert CenterSingle Shaft Turbocompressor for BOG Recovery in LNG Terminals
Author: Sven-Erik BRINK (Feed Team Manager – BOG compressor market specialist) Siemens AG Energy, Sector Oil & Gas Division
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Let´s talk about a paradigm switch …
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Let´s talk about a paradigm switch …
Picture © Bombardier
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Worlwide increase in LNG demand leading to:LNG tanker sizes are increasing – this results in an increased maximum BOG volume rate at LNG ReceivingTerminals during SHIP UNLOADING.
LNG send out rates are increasing and often totallycompensate BOG volume during HOLDING – the GAPbetween max. and min. BOG flow is becoming larger.
Todays LNG storage tanks are most often of full contain-ment design which allow for pressure fluctuations insidetanks.
Todays BOG single shaft centrifugal compressor designare customized for start/stop operation – featuring variable Inlet Guide Vanes (IGV) and heated seal carriers.
The combination of above facts implementing a change of compressor concept.
LNG Receiving Terminals Situation have changed plus Progress in Advanced Technology
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Over 30 years experience with BOG handling at LNG export plants as a market-leader …Siemens has developed an innovative concept for LNG import terminals.
This concept features a single-body, single-shaft, multi-stage, centrifugal compressor optimized for small and medium BOG volume flows and capable of automatic start/stop operation from ambient as well as from cold conditions with no cool-down required.
This concept opens the door for the paradigm switch to maintenance-free, safe, economic and environmentally friendly BOG handling within Liquefied Natural Gas (LNG) import terminals (onshore as well as offshore), improving significantly the Total Cost of Ownership (TCoO)
LNG Receiving Terminals Siemens opens the door for the paradigm switch
Picture © Bombardier
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Simplyfied BOG Generation Profile along the LNG chain
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
BOG Volume /Massflow
LNG ChainTransportProduction Regas
LOADING Mode
UNLOADING Mode
HOLDING Mode HOLDING Mode
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Todays LNG Plants
E
LP HP
1 bar-160° C 22 – 41 bar g
Fuel GasSystem
7 – 10 bar
Early LNG Plants and Todays LNG ReceivingTerminals
E
LP
6 – 10 barRecondenser or Fuel Gas System
1 bar-160° C
BOG Turbocompressors(two casing vs. single casing)
Export Plant (tandem)
Start / Stop Operation8000 to 39000 m3/h- 163 to - 120 °C1.00 to 1.15 bar2200 to 7500 kW
Import Terminal (single)
Start / Stop Operation5000 to 33000 m3/h- 163 to - 100 °C1.00 to 1.25 bar2200 to 7500 kW 800 to 3500 kW
Siemens world market leader for cryogenic temperature BOG applications for LNG Loading Plants
New market for LNG Receiving Terminals (onshore and offshore) applying same technology as for LNG Loading (Export) Plants
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TC
IGV setting -10° to +75°
FC
2nd stage HP Pumps
To Vaporizer and Gas Pipeline
Recondenser
Suction Drum
BOG Compressor
Desuperheater
BOG at 1 bar BOG at 8 bar
LNG at 8 bar -162 °C (-260 °F)
LNG Storage Tank
1st stage LP Pumps
Simplified Flow SchematicThe onboard BOG recondensing concept
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Compressor selection for import terminalsBOG handling concepts
Concept B
1 x 100%Concept A
2 x 50% or3 x 33%
Concept D
Concept C
2 x 50%
Increasing LNG sendout / ship size
BO
G v
olum
eflo
w
UNLOADINGMode
HOLDINGMode
1 x 100 % hybrid concept
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Application range of different compressor typesD
isch
arge
pres
sure
[bar
]
Actual suction volume [m³/h]
Integrally geared typeBOG references rangefor LNG Carriers
Siemens single shaftBOG references range
1.000.0001.000 10.00020.000 100.000
70.000 200.000
Turbo radial
Reciprocating
Screw / Rotary vane / Roots
Turboaxial-(radial)
3500
1000
600
250
100
50
10
100
BOG volume flows
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Among all possiblecompressor designs,the single-shaftconcept ensureshighest reliabilityand availability.
BOG compressor conceptSingle shaft turbocompressor with vertically split casing
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Single shaft BOG compressor cross sectional drawing
Oil heated Seal Carrier
3D Impeller
Dry Gas Seal
Inlet Guide Vane Unit (IGV)
Special Design Features Single shaft turbo compressor for cryogenic temperature BOG
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IGV Animation
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L x W x H [mm]: 9,500 X 3,000 X 3,000weight [kg]: 55,000
BOG single shaft Turbocompressor Layout Compact single lift package concept
step-up gear
compressor
seal gas panel
oil unit
single liftbaseplate
electric drivemotor
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Single shaft turbo compressor guarantees highest reliability and availability plus maximum safety No spare units required Virtually maintenance freeLowest weight, minimum footprint (ideal for offshore) No gas to atmosphere – low noise 85 bD(A)Easy erection and installation due to fully piped, wired and teates singel lift compressor packagesImproving significantly the Total Cost of Ownership
ConclusionWhy optimize the compressor concept?
Picture © Bombardier
© Siemens AG 2010. All rights reserved.
Our competencedrives your profit …
Sven-Erik BrinkFeed Team (BOG Market Specialist)Energy Sector, Oil & Gas Division
Wolfgang Reuter PlatzP.O. Box.10 15 0747053 Duisburg, Germany
E-mail: [email protected] phone +49 172 250 9405
Copyright © Siemens AG 2010. All rights reserved.
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