# Introduction to Gas Turbine Power Plant

- Link: https://studyelectrical.com/2015/10/introduction-to-gas-turbine-power-plant.html
- Published: 2015-10-06T16:44:00+00:00
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The gas turbine power plant obtains its power by utilizing the energy of burnt gases
and air, which is at high temperature and pressure by expanding through several 
rings of fixed and moving blades. It thus resembles a steam turbine. 

To get a high pressure (of the order of 4 to 10 bar) of the working fluid, which
is essential for expansion a compressor, is required.

[⌊Gas Turbine Power Plant⌉⌊Gas Turbine Power Plant⌉[

Gas Turbine Power Plant

The quantity of the working fluid and speed required are more, so, generally, a 
centrifugal or an axial compressor is employed. The turbine drives the compressor
and so it is coupled to the turbine shaft.

![Gas turbine power plant](https://studyelectrical.com/wp-content/uploads/2015/10/
Gas-turbine-power-plant.jpg)

Gas turbine power plant

If after compression the working fluid were to be expanded in a turbine, then assuming
that there were no losses in either component the power developed by the turbine
would be just equal to that absorbed by the compressor and the work done would be
zero. 

But increasing the volume of the working fluid at constant pressure, or alternatively
increasing the pressure at constant volume can increase the power developed by the
turbine. Adding heat so that the temperature of the working fluid is increased after
the compression may do either of these. 

To get a higher temperature of the working fluid a combustion chamber is required
where the combustion of air and fuel takes place giving temperature rise to the 
working fluid.

Thus, a simple gas turbine cycle consists of

 1. **a compressor,**
 2. **a combustion chamber and**
 3. **a turbine.**

Since the compressor is coupled with the turbine shaft, it absorbs some of the power
produced by the turbine and hence lowers the efficiency. The network is, therefore,
the difference between the turbine work and work required by the compressor to drive
it.

Gas turbines have been constructed to work on the following: oil, natural gas, coal
gas, producer gas, blast furnace, and pulverized coal.

### Classification of Gas Power Plant

The gas turbine power plants which are used in the electric power industry are classified
into two groups as per the cycle of operation.

 1. **Open cycle gas turbine.**
 2. **Closed cycle gas turbine.**

A simple **open cycle gas turbine** consists of a compressor, combustion chamber,
and a turbine. The compressor takes in ambient air and raises its pressure. Heat
is added to the air in the combustion chamber by burning the fuel and raises its
temperature.

**The closed-cycle gas turbine** plant was originated and developed in Switzerland.
In the year 1935, J. Ackeret and C. Keller first proposed this type of machine and
the first plant was completed in Zurich in 1944.

In a closed-cycle gas turbine plant, the working fluid (air or any other suitable
gas) coming out from the compressor is heated in a heater by an external source 
at constant pressure.

 

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