Thermal PowerTec Ltd.
Gas Turbine Power Plants
Existing Gas turbine power plant (GTPP)
GTPP in the whole consist of an air compressor, a gas turbine, gas turbine cooling system and
generator (Fig. 028).
The gas turbine power plant offers low capital costs, quick installation, flexibility in fuel
selection and low maintenance cost but low thermal efficiency and expensive demineralized
Gas Turbine Air Cooling:
The problem of the gas turbine is particularly in the high temperature of the turbine blades.
In order to bear the high temperatures, apart from the use of developed materials the turbine
components are cooled additionally from the inside, by compressed and
cooled cooling air.
Open cooling concept is used for cooling the compressed cooling air:
A part of the compressed air is removed on different pressure levels
from the compressor and used for the cooling of combustion chamber and turbine blades.
The extracted cooling air must be cooled down, before it used as cooling air in the turbine.
After cooling of turbine components the cooling air is mixed in the turbine with the main
Water Injection (quench cooler) is used in GTPP:
In gas turbine power plants usually the cooling air is cooled by water injection (Quench cooling)
and be supplied as cooling air to the cooling system of the turbine. During such open air
cooling with a water injection the previously demineralized water and its evaporation heat flow
go lost with the turbine exhaust gases.
In particular in countries with dry regions it is to be found necessarily a new procedure
with an effective cooling air cooling without a water consumption.
The research and the development of the gas turbine cycle led to a new procedure for
the reduction of exhaust gas losses.