Gas power station

Working fluid is air. Air is compressed and then heated by burning fuels. That compressed, heated air is fed to the gas turbine. In here gas is expanded and able to do mechanical work (rotating the turbine). In this type of power plants turbine shaft and air compressor shaft is mounted on a same shaft so that amount of generated power can be used to drive the air compressor. So it is clear that it need starting method. Electric motor known as cranking motor is used to start the compressor initially after starting a part of mechanical energy produced in the turbine is used to drive the compressor. 

Arrangement of gas power station

Compressor

This is a rotary type compressor and used to make compressed air. Initially, at the starting, this is driven by electric motor. But after that operate by using a part of energy that produce in the turbine. Atmospheric air is fed into the compressor via filters to remove dust and other particles.

Regenerator

Compressed air is flows through tubes inside this regenerator. Exhaust gas from the gas turbine flows through this regenerator so that part of their heat is absorbed by the compressed air.

Combustion chamber

Compressed air from the regenerator send to the combustion chamber for heating. Oil is injected with high pressure (atomizing air) so that they could properly mixed with air and easily and completely burned. This atomizing air get by an early stage of the compressor. Then ignite the air by high voltage spark plugs. Inside the combustion chambers there are flame detectors to detect whether oil mixed gas is fully burned or not. Resultant air is at about 3000⁰F but they are cooled to about 1300⁰F to 1500⁰ and then sent to the gas turbine.

Gas turbine

High pressure and high temperature gas passes through this turbine while expanding. So air able to some mechanical work (rotating the turbine). The exhaust gas should be in a proper temperature about 900⁰F to avoid making water droplets.