Fresh water requirement: 1000 cubic meters per day
Gas turbines, OTSGs, and steam turbines and their auxiliaries are all mounted on a single floating barge
Compact size of 106 meters x 55 meters x 6 meters, with a total draft of 6 meters
Minimum onshore facilities required
Minimum draft of 3 meters required
Last used briefly in 2015
Barge Mounted Combined Cycle Power Plant (CCPP)
4 x 50.8 MW LM6000 PC Sprint aero derivative gas turbines
4 x once through steam generators
1 x 53 MW rated output steam turbine and generator
Minimum Onshore Facilities
Switchyard for power evacuation, 415V MCC for DM plant, etc.
Fuel treatment and forwarding
Water treatment plant and DM plant
Fire fighting system
Advantages
Minimum land requirement of about 20 acres for offshore facilities
Foundation is not required for main plant, hence reduced construction time
Black start facility for plant start up is available
Main plant systems supplied by reputed OEMs like GE and ABB
OTSG has dry running capability up to 560 °C, which is suitable to operate in a simple-cycle mode
Once through steam generator is quick to adjust during sudden fluctuation in load
Gas Turbine
Make: GE
Model: LM 6000 PC Sprint
Capacity: 50.8 MW
Installed on barge
Gas turbine generator is open air-cooled, synchronous type and totally enclosed
5 stage low pressure compressor – compression ratio is 2.4:1, 14 stage high pressure compressor – compression ratio is 12.5:1
Steam Turbine
Make: ABB
Installed on barge
Capacity: 53.58 MW
40 stage dual pressure condensing type steam turbine
2 pole generator with air cooling for stator and rotor winding
Once Through Steam Generator
Make: IST, Canada
Dual pressure OTSG installed at the exhaust of the gas turbine
Steam parameters: pressure/temperature – HP steam: 56 bar / 419 °C, LP steam: 4.7 bar / 240 °C
Dry running capability as the tubes are made of Inco alloy
Chillers
Used for cooling the gas turbine intake air for increasing the gas turbine output
Chiller capacity: 1210 TR
Refrigerant used is HFC134a
Compressed Air System
3 x 100% screw type air compressors with 2 x 100% desiccant type dryers
Capacity: 12.7 Nm3/min and 8.64 bar g discharge pressure
Plant Electrical System (Barge Mounted)
Power is generated at 11 kV and evacuated at 220 kV
2 nos. of step-up transformer 11 kV / 220 kV (1 each for 2 gas turbines) and 1 step-up transformer for steam turbine
2 nos. of unit auxiliary transformers for stepping down from 11 kV to 6.6 kV for running plant auxiliaries
4 nos. of step-down transformers called auxiliary transformers for stepping down the 6.6 kV to 415 V
Other Plant Facilities
Demineralization plant: produces de-mineralized water for generating steam in OTSG
Cooling water system: suitable for river/sea water which can be connected to closed circuit cooling water system onshore if required
Fire Protection and Fire Detection System
Water hydrant system (consisting of six fire water pumps, out of which 2 are diesel engine driven and 1 barge mounted emergency fire pump (diesel driven))
High velocity water spray system (HVWS) system
Carbon dioxide flooding system
Portable fire extinguishers (water type, foam type, CO2 gas type, dry chemical powder type extinguishers)
Fire detection and alarm system
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