Nuovo Pignone Turbines
Gas turbine PGT 10 is a Nuovo Pignone gas turbine and is mounted on a base frame. The gas turbine depressurizes high-energy exhaust gas, thus converting thermal energy into mechanical energy. The mechanical energy generated by the gas turbine is used to drive the machine train. The gas turbine is supplied with the required fuel via a fuel gas system.
The start-up system consists of a frequency-controlled asynchronous motor and a frequency converter. The start-up system is mounted on the base frame of the machine unit and has the following functions:
- Ventilation before initiation of ignition to purge gas residues out of the core turbine and if installed out of the downstream heat recovery boiler.
- Acceleration of gas generator rotor up to ignition speed, self-sustaining speed or cleaning speed.
The ensemble of the rotoric and statoric blading and their inlet and compressor discharge casings define the turbines axial compressor.
The stator blades consist of 19 stages.
First 5 are variable guide vanes while the remaining ones act as flow straighteners.
The rotoric blades consist of 17 stages.
Combustion chamber is flanged on the high pressure turbine casing; it includes
- Outer Casing
- Fuel Nozzle
- Liner (Inside which combustion takes place)
- Spark Plug.
The turbine PGT 10 has two types of bearings.
- Journal Bearings
- Thrust Bearings
There are 4 journal bearings that are conventionally called n=1, 2, 3, 4 in order.
2 Thrust bearings are moreover provided in line with the bearings n=1, 4
1 for HP shaft and 1 for LP shaft.
Bearings n=1, 2 supports HP rotor (Axial compressor, 1st and 2nd stage buckets)
Bearings n=3, 4 supports LP rotor (3rd and 4th stage buckets) which operates the drive machine (Power rotor).
PG-10 Nuovo Pignone Gas Turbine
|Area of Machine
|OGDCL||Gas Turbine (Nuovo Pignone)
|PG-10 Nuovo Pignone
|Turbine type||Gas turbine
|Bearings type||Journal Bearings(4)(n=1,2,3,4)
1,2 for HP rotor
3,4 for LP rotor
Thrust bearings are provided with bearings 1(HP shaft) and 4 (LP shaft)
|Coupling type||Flexi box type FSCE 1100
Flexi box type FSCE 1500
|No. of stages
Compressors are the machines used to compress compressible fluids. At Qadirpur gas field compressors are used for many purposes and of different types. Two main types of compressors are enlisted below:
- Positive Displacement Compressors
- Rotary Compressors
- Compressors usage at Qadirpur Gas Field
- Instrument Air.
- Plant Air.
- Front End Compression unit (FECP)
- Positive Displacement Compressors
- Centrifugal Compressors( Turbines)
- Mother Plant (Turbines).
Front End Compression Unit (FECP)
There are 14 double acting reciprocating positive displacement compressors (K1301-K1314) that are installed in parallel fashion on the common suction line. Gas from the suction line enters the compression unit. This is also known as front end compression unit (FECP). These all 14 compressors are driven by WAUKESHA (12-V) engines.
Gas from the scrubber enters the suction bottle. The function of the suction bottle is to minimize the pulsation in the compression chamber. From here gas enters the compression chamber and is compressed to a high pressure. There are 2 suction chambers with the suction bottle and both are the connected with the discharge bottle. Function of the discharge bottle is to minimize the pulsation in the line. In each compression chamber there are 4 valves, 2 suction valves and 2 discharge valves. As the shaft moves in the chamber alternate suction and discharge valve opens. Same phenomenon occurs in both the chambers. Gas from the discharge bottle then further moves to the fin tube air cooler to remove the heat of compression and after being cooled down it is then sent to the second scrubber of the unit for the removal of any liquid if present, in high pressure cooled gas. Gas is then passed through the other two compression cambers of the unit via suction bottle and then again moves to the fin tube air cooler for cooling via discharge bottle. Now this cool gas is entered in the discharge header. Discharge from all the compressors enters the same discharge header (Common Point).