PELRINE & BUCHANAN'S MARITIME TRADING WORLDWIDE LTD.



66.9 MW Pratt and Whitney Dual Fuel Turbine Power Plant

Model FT8-1 twin gas turbines, steam turbine and boiler
3000 rpm
10.5KV, 50HZ,
Installed in 1996
overhauled in 2005/2006, upgraded to dual fuel in 2007.
Complete combined-cycle power plant.
Maintenance performed by manufacture

picture

Model FT8-1 twin gas turbine unit with heat recovery   Complete combined-cycle plant has a output: 66.9 MW electricity generation efficiency is 47.5%.
The gas turbine unit was put into commercial operation in March 1996 to serve the electrical grid peak load usage. The plant has run for a total of 12,500 hours, the accumulation starting number of times 2000 times. In October, 2007 the company invested 1,060,000 USD in dual fuel improvements, since then it ran for only 90 hours.
The HRSG forms a complete set with the FT8 twin gas turbine unit. The steam turbine is axial flow and reaction type. The HRSG and the steam turbine completed in 1996.
The whole set unit performance is fine, last generated electricity in December, 2007, it presently is in good maintenance condition.

2. Major equipments

FT8-1 twin gas turbine unit in 1995 was supplied by Pratt &Whitney, (PT8) and the generator including two GG8 gas generator and with its matching power turbine. The distinction is A machine and B machine.
A machine delivered in August, 2005 to the manufacture in United States for overhaul and put back into operation.  It ran for 1300 hours before sending back for repair, since then it has run for 9800 hours.
A machine in December 2006 delivered to the manufacture in United States for overhaul and then was put back in operation, since then it has only run for 1100 hours.

3. Supply Scope:

Whole set combined-cycle unit (1, 2 units) contain machine, the electrical, the boiler and auxiliary equipments.
The main supply scope : Two gas turbines and the necessary generator, the HRSG and the steam turbine, two main transformers, the natural gas conditioning units, the step up station, and the gas feed, oil feed, the electrical, the control, the water supply, the factory use electrical and system.

4. Major technical parameter:

Gas Turbine

A. Gas turbine (under standard state):

Model: FT8-1
Power: 48MW
Heat Rate: 9845KJ/KWH
Discharge temperature: 462

B. Generator :

Rated power: 50.9MW
Rated power factor: 0.85
Nominal current: 3295A
Rated voltage: 10.5KV
Frequency: 50HZ
Pole number: 2
Phase: 3
Wire: Y
Rated speed: 3000 rpm
Rotor pattern: Non-salient pole
Excitation way: Not brushes
Excitation rated voltage: 192V
Rated excitation electric current: 970A
No load excitation voltage: 39V
No load excitation electric current: 235A
Insulation grade: F
Manufacturer: British Brush electrical machinery company

C. Exciter model: 61968A-1E

Rated power: 2.6KW
Rated voltage: 42V
Nominal current: 62A
Manufacturer: British Brush Electrical machinery Company

D. Pressure conditioning unit type: D-15.5/16-41 natural gas compressor

Pattern: Two row one stage symmetrical balanced manifold
Pressure: 1.6 Mpa(G)
Exhaust pressure: 3.1-4.1Mpa(G)
Rotational speed: 375rpm

HRSG:

Boiler equipment
Manufacture date 1995 September
Production date October, 1996
Model Q467/467-59 (11) - 3.43(0.88)/435(230)

Boiler specification

Medium pressure section
Most continual transpiration rate 59.2t/h
Fixed steam pressure 3.34MPa
Fixed vapor temperature 435
Steam drum working pressure 3.73Mpa
Low pressure section
Most continual transpiration rate 11.0t/h
Fixed steam pressure 0.78MPa
Fixed vapor temperature 230
Steam drum working pressure 0.88Mpa

Eliminates oxygen section

Working pressure 0.05MPa
Operating temperature 111
Water outlet temperature >104
The water tank volume: 35T
Working ability: 75 T/H

Steam turbine and supporting facility

Manufacture date 1995
Production date October, 1996
Model: NK50/71/0

Steam turbine equipment

Steam engine model: NK50/71/0
Serial number: T6356
Rated power: 15760KW
Rated speed: 5513RPM

Steam specification:

Main steam: Admission pressure (normal/biggest) 3.27/3.27MPa
Admission temperature (normal/biggest) 427/435
Supplementary steam: Admission pressure (normal) 0.726Mpa
Admission temperature (normal) 222

Generator:

Model: QFN-16-2
Rated power: 16000KW
Nominal current: 1035A
Rated voltage: 10.5kV
Rated speed; 3000RPM
Critical rotation speeds: 1502RPM corresponds to steam engine rotational speed 2760RPM
Power factor: 0.85

Exciter:

Model: 2LG-65
Voltage: 230V
Electric current: 282A
Capacity: 65KW
Excitation way: Auto excitation

Valid XHTML 1.0 Transitional