Categories of Gas Turbines defined.
What are the different types of gas turbines?
The simple-cycle gas turbine is classified into five broad groups:
1. Frame Type Heavy-Duty Gas Turbines.
The frame units are the large power generation units ranging from 3 MW to 480 MW in a simple cycle configuration, with efficiencies ranging from 30-46%.
2. Aircraft-Derivative Gas Turbines Aero-derivative.
As the name indicates, these are power generation units, which originated in the aerospace industry as the prime mover of aircraft. These units have been adapted to the electrical generation industry by removing the bypass fans, and adding a power turbine at their exhaust.
These units range in power from 2.5 MW to about 50 MW. The efficiencies of these units can range from 35-45%.
3. Industrial Type-Gas Turbines.
These vary in range from about 2.5 MW- 15 MW. This type of turbine is used extensively in many petrochemical plants for compressor drive trains. The efficiencies of these units are in the low 30s.
4. Small Gas Turbines.
These gas turbines are in the range from about 0.5 MW-2.5 MW. They often have centrifugal compressors and radial inflow turbines. Efficiencies in the simple cycle applications vary from 15-25%.
5. Micro-Turbines.
These turbines are in the range from 20 kW-350 kW. The growth of these turbines has been dramatic from the late 1990s, as there is an upsurge in the distributed generation market.
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