Fuel booster for gas turbine

Fuel booster for gas turbine

Compressors are used as fuel boosters to compress natural gas from various sources to gas turbines that function as generator sets or mechanical drives. Fuel gas booster compressors ensure continuous supply of fuel gas to gas turbines at specified temperature and pressure.
Fuel boosters can be customized on specific request. We supply a wide range of compressors, up to 50000 Nm3/h.
The choice of compressor type and capacity control type is based on the flow rate and inlet/outlet pressure required. Our products are widely used in the power industry thanks to their high efficiency and low maintenance costs.

Electric motors are broadly used; diesel or gas engines are also available.
Compressors mounted on frame to allow easy transportation and installation.

Capacity Control Types

The screw compressor can operate over a very wide range with little or no changes required to the machine, which makes it very well suited for power generation – a process where fl ow rates and operating conditions are often changing.
Screw compressors are usually provided with hydraulic slide control. By moving the slide parallel to the rotor, the outlet pressure remains constant as the gas fl ow increases or decreases.
The most remarkable advantage of unloading with a slide valve is the high amount of power saved through reduced fl ow rates. Other methods of capacity control include variable frequency drives mostly used in case of signifi cant variations in the inlet pressure. 

System Description

To eliminate possible solid particles, we install a fi lter (FS175) upstream of our gas compressors (FGC).
The lube oil system of a screw compressor is closed loop. Oil is injected into the machine in several places. Once the oil is injected, it combines with the gas. The oil and gas mixture is then discharged out of the machine. The injected oil must be removed from the gas downstream of the compressor.
The oil and gas mixture enters a gas-oil separator (B200) where the compressed gas and the oil are separated by centrifugal force. The gas then fl ows in the same vessel through a coalescing fi lter (FS120) that reduces the oil content to the value required by the customer. The gas goes from here into a gas-water or air-water cooler (W119) that allows temperature control, independently of the FGC operating mode according to the requirements of the GT manufacturer.
The gas then fl own through a second stage coalescing fi lter (FS122) which acts as a backup in case of a malfunction of the FS120. When required by the GT manufacturer, a third stage can be installed in order to further reduce the oil content. Our separation-cooling system allows the delivery of a dry and clean gas, in accordance with the most stringent parameters for fuel gas quality as required by all major OEM gas turbines (GT).

Our compressors feature separate oil- and gas-cooling circuits. Each circuit has its own dedicated heat-exchanger (W119 and W203). This system allows the control of the gas temperature, independently of the operating mode of the SGC.

The volume of the B200 vessel is specially designed to prevent the overfl ow of oil into the downstream gas line even in case of an emergency stop at full load.

References


MediumYearInlet pressureDischarge pressureRated power
Natural gas200415 bar36 bar1250 kw
Fuel gas boosters for turbines Siemens SGT-800

MediumYearInlet pressureDischarge pressureRated power
Natural gas201015 bar46 bar750 kw
Fuel gas boosters (2+1 standby) to supply gas turbines model GE LM6000