Detailed Product Description

Gas turbine compression units () consisted of a gas turbine and a pipeline centrifugal compressor are designed to transmit natural gas by the gas mains.

Gas turbine compression units rated at 16 or 25 MW are installed at  the compression stations of modern gas mains with up to 1420 mm diameter pipelines.

Gas turbine compression units of the -6"" type are aimed to replace employed at present units at rate 6 MW that has exhausted the service life. The modern mass is 2.5 times smaller than the previous ones and the specific fuel flow rate is 26 % less.

Each is equipped by the family of gas natural compressors with discharge pressure 6 - 76 kgf/cm² and daily capacity from 12 to 51 mln. m³.

The gas turbines are  mutually unified to  maximum extent and made by simple open cycle diagram without regeneration of the exhaust gases. The rate of -16--1 and -25-1 is due to selecting the corresponding parameters and the design of hot flow path.

A gas turbine includes a gas generator, comprising a cycle compressor, a combustion chamber, a high pressure turbine and a power turbine through which a natural gas compressor is driven, a control system, start-up and oil supply systems. The gas generator rotor (high-pressure turbine, HPT) and the compressor drive rotor (power turbine, PT) rotate individually.

The natural-gas compressors are one- or two staged, flow paths of each family have been unified to most possible extent and are located in one casing.

The oil system is common for the GT and the natural-gas compressor.

The GT and the natural gas compressor have their own frames that are coupled at the compression station forming the gas natural system.
The system of remote control, monitoring and protection and a regulation system make presence of maintenance personnel in the engine room unnecessary.

The units are provided with an anti-icing system, which ensures an automatic supply of hot air for heating the inlet vane device of the compressor. In addition they are equipped with  system feeding exit gases to the inlet of the complex air cleaner and the air circuit.
The GT is started either with the expansion turbine operating on natural gas or by an electric drive.

The units are installed at an elevation of  0.5m.

The main unit of the GTP on the frame (oil tank) and the compressor on its frame are delivered as separate transportable packages.

Basic parameters of the gas turbine compression units

Parameters	Types of the Gas turbine compression units
	-25-1	-16-1	-6*
Nominal power at the compressor drive coupling, MW	25	16,8	6,5
Efficiency, %	32	31	31
Gas temperature upstream of the HPT, 0C	1090	920	920
Power turbine rotational speed	5650	5100	8200
Exit gas temperature, 0	500	420	410
Compressor pressure ratio	13	11,5	12
Type of the natural-gas compressor	2-25-76-1,44	2-16-76-1,44-1; 2-16-76-1,5-1; 2-16-76-1,37-1; 2-16-56-1,44-1;	-6-56-1,25	2-6-76-1,5
Volume output, m3/day 10-6	47	33,3	20,5	12
Polytropic efficiency in the interval of working regimes, % minimum	83	83	83	83
Pressure ratio	1,44	1,44; 1,5; 1,37	1,25	1,5
Gas pressure at the compressor outlet, kgf/cm2 (MPa)	76(7,45)	76(7,45) 56(5,5)	56(5,5)	76(7,45)
Number of the compressor stages	2	2	1	2
Overall dimensions,	14,63,23,6	14,63,23,6	16,73,23,8
Weight of the turbo-group, t	48	46	25

* Bench test