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Chapter: Mechanical and Electrical - Power Plant Engineering - Diesel,Gas Tubine and Combined Cycle Power Plants

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Advantages and disadvantages of Gas turbine power plant

They are small in size, weigh less and have low initial cost per unit output.

Advantages and disadvantages of Gas turbine power plant

 

Advantages of Gas Turbine Power Plant

 

1.     They are small in size, weigh less and have low initial cost per unit output.

2.     They are easy to install within short periods.

3.     They are quick-starting and smooth running.

 

4.     They offer flexibility by supplying electricity for power generation as well as by supplying compressed air for process needs.

5.     They are capable of using a range of liquid and gaseous fuels including synthetic fuels.

6.     They are subjected (put) to fewer environmental restrictions than other prime movers.

7.     Water consumption is less compared to steam power plant.

 

 

Disadvantages

 

 

1.     An electric motor or an I.C. engine is necessary for starting the plant. The starting motor must bring the compressor well towards the operating speed. So, starting is not simple as in the case of other power plants.

 

2.     Gas turbine plants have less vibrations when compared with reciprocating engines of the same speed. However the high frequency noise from the compressor is objectionable.

 

3.     High temperatures impose severe restriction on the servicing conditions of the plant.

 

4.     Overall efficiency is low since two-thirds of the total power output is used for driving the compressor.

 

5.     The blades of the turbine require special cooling methods due to the severity of operating temperatures and pressures. In practice, the temperatures at the entry of the turbine are as high as 1100°C - 1260°C. Hence they should be made of special metals and alloys.

 

6.     They are incompatible with solid fuels.

 

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