Gas Turbine Advantages And Disadvantages

Applications

• Gas Transmission

• Storage / Withdrawal

• Gas Gathering

• Gas Boosting / High Pressure. (kelly, 1991)

Turbine Engine

The gas turbine provides the power to drive the compressor. It is a simple cycle, variable speed, axial flow unit. The engine has two major sections:

1. Gas Producer (GP)

2. Power Turbine (PT)

The gas producer converts the energy of the fuel into hot gases, which the power turbine captures and converts into rotational energy. There is no mechanical connection between the PT rotor and GP rotor, so the two are able to rotate at different speeds. This is known as a two-shaft, or split-shaft engine.

Gas turbine is a heat engine that converts the chemical energy of fuel into mechanical energy, using air as the medium of conversion. This resulting mechanical energy where used to drive compressor to increase

The Brayton Cycle, as applied to the gas turbine engine, consists of the following four events:

Compression Atmospheric air is compressed.

Combustion Fuel is blended with the compressed air, and the mixture is ignited, resulting in rapidly expanding hot gases.

Expansion The hot gases expand through the turbine section of the engine, producing rotational torque in the process.

Exhaust The spent gases discharge to atmosphere after having given up most of their energy to the turbine section

The Brayton Cycle taking place in the engine is a smooth continuous process. Compression, combustion, expansion, exhaust and the resulting production of rotating mechanical output power occurs simultaneously and continuously. (company, 2008) Operation sequences:

• Compression

Air is continuously drawn into the engine through the air inlet where it is compressed by the fourteen-stage axial-flow compressor. The compressed air flows into the combustion chamber where it is mixed with the injected