COP Optimized Cascade LNG Process Two-Trains-in-One Approach plant availability with operating flexibility
Power Generation
Turbine/ Compressor 50%
Turbine/ Compressor 50%
Turbine/ Compressor 50%
Turbine/ Compressor 50%
Maximum
Turbine/ Compressor 50%
Turbine/ Compressor 50% Boil off Gas
Gas Conditioning 100%
Propane Cycle 100%
Ethylene Cycle 100%
Methane Cycle 100%
Overall Plant Production Efficiency
Storage & Loading 100%
>95%
Operating Range (% of design)
Full Plant
80 105%
One Turbine Offline
60 80%
Three Turbines Offline*
30 60%
*At least one turbine on each cycle must be operating
Plant Idle
0 30%
Ch. 30 - 170
Darwin LNG Project Block Flow Diagram Acid Gas Incineration
Feed Gas
Gas Conditioning
Fuel Gas Distribution
Propane Refrig. System
Ethylene Refrig. System
Methane Compressor
LNG Storage and Loading
LIQUEFACTION
Condensate Stabilization Condensate To Acid Gas Incinerator / Trucks
Condensate Storage
Vapor Recovery
Plant Fuel
Ship Vapors
Marine Facilities
LNG to Ship
Nitrogen Rejection Nitrogen
Ch. 30 - 171
The Darwin LNG Process
Ch. 30 - 172
The Optimized Cascade LNG Process SM
Representative Turbine Performance
Efficiency
Fuel Consumption (Indexed)
Turbine
Shaft
Power (kW)
Scheduled Downtime
Frame 5D
Dual
32,580
29.4%
100
2.6%
LM2500+
Dual
31,364
41.1%
72
1.6%
LM6000
Dual
44,740
42.6%
69
1.6%
Frame 7E
Single
86,225
33.0%
89
4.4%
Frame 9E
Single
130,100
34.6%
85
4.6%
Values are representative
Ch. 30 - 173
The Optimized Cascade LNG Process SM
Turbine Performance Power and Heat Rate Index 120 LM6000 Heat Rate
110
Frame 7 Heat Rate
100 90 80 LM6000 Power
Frame 7 Power
70 60 50 0
10
20
30
40
50
60
Inlet Air Temperature (C)
Aeroderivatives are more sensitive to ambient conditions Ch. 30 - 174
The Optimized Cascade LNG Process SM
Aeroderivative Plant Configurations
Turbine (No. x Model)
Number of Turbines By Service (Propane/Ethylene/Methane)
Nominal Train Size (MTPA)
6 x LM2500+
2/2/2
3.5
8 x LM2500+G4
3/3/2
5
6 x LM6000 DLE
2/2/2
5
9 x LM6000 DLE
3/3/3
7.5
Ch. 30 - 175
Phillips Cascade Process
Simple to design and operate Simple cycle Frame 5 gas turbines mechanical drive No helper turbine or large motor needed for start-up Increased size with two gas turbine trains for each refrigerant process Parallel compressor trains avoids capacity limits Increased CAPEX due to more (six) trains offset by increased availability 95-96% with parallel train operation Loss of one train does not cause plant shut down Production carries on with reduced capacity Refrigerant and exchangers temperature not affected by one train trip enabling quick restart
