Confidential. Not to be copied, distributed, or reproduced without prior approval. Electric Motor-Driven Compression System (eLNG)
Confidential. Not to be copied, distributed, or reproduced without prior approval.
Electric Motor-Driven Compression System (eLNG)
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Summary
April 5, 2017 2
• LNG plant: process and eLNG advantage solution
•Electric motor-driven compression system design
challenges
•System Test Validation
•Conclusion
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
ALNG I
ALNG II&II
ALNG IV
Woodside LNG I
Woodside LNG II
Woodside LNG III
Woodside LNG IV
Woodside LNG V
Skikda LNG
Arzew LNG
Angola LNG
Segas LNG
Idku LNG I
Idku LNG IIEG LNG
MLNG DUA
MLNG TIGA 7&8
Petronas Tr 9
Oman LNG I-II
Qhalat LNG
Peru LNG
Pluto LNG
Darwin I LNG
PNG LNG 1&2
Nigeria LNG I-II
Nigeria LNG III
Nigeria LNG IV-V
Nigeria LNG VI
Tangguh LNG 1-3
Gorgon LNG 1,2,3
QC LNG 1&2GLNG 1&2
APLNG 1&2Wheatstone LNG 1&2
Ichthys 1&2
Hammerfest LNG
Sakhalin II LNG Tr 1-2
Yemen LNG
SP LNG 1&2
SP LNG 3-5 Dominion LNG
Yamal LNG 1-3
RasGas I-V
RasGas VI-VIIQatarGas Tr 1-3
QatarGas II Tr 4-5
QatarGas III Tr 6-7
PRELUDE
EXMAR
PF LNG 1&2
CCLNG 1-2
Freeport 1-3
Cameroon LNG I-II-II
Donggi LNG
GOLAR
#103 train awarded...400 mtpa equivalent LNG capacity
LNG total fleet of >850 equipment: +300GT; +500CC; +80 w Electric Motors (Helpers and Main)
~60 String Tests performed @ November 2016
GE Experience in LNG
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
LNG plant process and eLNG advantage solution
April 5, 2017 4
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Freeport LNG Plant & Process
Pre-cooled mixed refrigerant process
(APCI)
• 3 LNG train
• 13.9 Mtpa of Liquefied Gas
• 2 Bcf/d of Feed Gas
C3
–P
reco
olin
g
Loop
Optimized process with:
• 4 kettle pressure levels (liquid/vapor phase
equilibrium) for pre-cooling
• Tight inter-stage pressure tolerances
• 2 kettle pressure levels (liquid/vapor phase
equilibrium) for main cooling
MR
–M
ain
Co
olin
g
APCI's C3-MR liquefaction process
(only one C3 return line is shown for simplicity)
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
eLNG advantage solution
Challenges
• Machine Size & Single Body Absorbed
Power.
• 75MW electric motor
• Very rigorous validation test campaign
Advantages
• Lower emission, dimensions and weight
• ready for start-up in very short time
• operating flexibility to cover different conditions
due to speed flexibility
Scatter Plot of LNG Power
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Electrical System Design Challenges
April 5, 2017 7
Gas Insulated Swichgear
• 138KV
• SF6 type
Transformer
• 138 KV 50/60Hz
• ONAN
• #3 secondary windings
VFD
• LCI 96 MVA
• 11 KV
• N+1 Tyristors
Motor
• 75 MW Synchronous 2p
• 3000 rpm (80%-105%)
• 2x11 KV – three bearings
Ehouse
• #3 modules
• Minimal mech/ele site interconnections
• Aux panel MV SW, MCC,DCP,AC UPS
Challenges
• LCI Harmonic Filter design based on more
than 600 network and operating configurations
• New Motor Frame Design
• Rotordynamics design on wide speed range
• Electromechnical System Integration
• Modularized BOP solutions (Ehouse) to reduce
site installation
Leverage GE experience in LNG design
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Centrifugal Compressor Design Challenges
April 5, 2017 8
Propane Train
• 3MCL1605 model
• Axially Split Casing
• 5 wheels arrangement in
a single body
• 3 internal side stream flows
MR Train
• MCL1065 + 2BCL1007 models
• Axially and Radially Split Casings
• Very high volume flow rate (150000 cfm)
• Big size of removable part (68T)
Entire machine (190T)
Optimized Aerodynamic Design Optimized Casing Sizing
and Sealing
Detailed study for Bundle
Assembly/Disassembly
Real power density compressor
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Surge Modelling
April 5, 2017 9
surge occurrence and
frequency during ESD
absorbed power in reverse
flow-positive rotation (IIQ)
CC deep chock exploration
Development/Improvement of production
design tool with all physics inside
Sizing of bypass valve & Active controls
Enhance modelling capability...reduce design cost, increase robustness;
Greatly reduce use of HGB (BOP reduction)
Extend operating range on the left of SLL by more than 10%
Extend CCS DB curves beyond present chock limits down to (or close to) zero head.
Benefits
Increase operating flexibilty...maximize production
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Rotordynamics
April 5, 2017 10
Lateral Stability Test
Operational Modal Analysis:
- Logarithimc decrement measurement
- No need of magnetic exciter
- Proven back-to-back test w/ exciter
35
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
32.5
Frequency [Hz]
DEGLOG: 0.1113
Res. Freq :52.7Hz - Res. Speed :3159.3rpm - AF:28.2178 - Zeta:0.0177
Start: 38.7Hz (2323.2rpm) - Stop: 64.6Hz (3877.0rpm)
(04/03/2013 14:03:30) - (04/03/2013 14:05:13)
65.357631.7714 35 40 45 50 55 60
Selected
Original
Laurentian
MID_plane_BW (xrev1)
Analytical Model (OMA)Exciter
NO Exciter anymore needed...reliable way to monitor
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
• Interharmonic studies
- Network resonances
- LCI harmonic Filter design to comply with
distortion limits
• Real Time Simulation platform to validate VFD control
- LCI Real control rack
- Mechanical Torsional mode
- Electrical grid model
• Sub Synchronous Torsional Interaction study
- Mechanical marginal stability...low mechanical damping
- Direct Torsional Excitation...air gap torque harmonic from VFD
- System Closed loop behaviour...ele+mech+ctrl setting
Electrical System Integration
April 5, 2017 11
Closed loop validation with LCI real control rack
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
System Test Validation
April 5, 2017 12
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
System Test Validation
In house O&G test bench with high available power (+100MW)
Test performed
• Compressor Mechanical Running test
• Compressor Thermodynamic Test
• Full-speed Full load Test (FSFL)
Validation
• Compressor rotordynamic
• Compressor mechnical behaviour (journal & thrust bearing)
• Motor rotordynamic/frame design
• Motor thermal design (temperature rise test)
• System operability and control
• Train torsional behaviour
• Auxiliaries functionality
Full electrical system validation
Torsional Vibrations by TVCS
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Monitoring and Diagnostics Train Damping System
• Real time advanced torsional
monitoring at train level
Plant Active Damping
Torsional Vibration Control System (TVCS digital edge)
Train closed loop & real time
control of torsional stress• Real time mitigation of
SSTI events at plant level
Ready for PREDIXTM based App Operation
Confidential. Not to be copied, distributed, or reproduced without prior approval.
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Conclusion
April 5, 2017 15
Confidential. Not to be copied, distributed, or reproduced without prior
approval.
Conclusion
• e-LNG solution is a valid alternative to traditional LNG
when there are emission, space and weight limitation.
• The technology with Voltage Source Inverter fed
induction motor can be another option.
• The validated design approach together with testing
capacity allows mitigate any technical risk even for
scaled up e-LNG trains.