Steam Turbine
A Steam Turbine is a
rotary mechanical device (turbo machine) that extracts energy from fluid flow
and converts it into useful work. Turbine has a moving part called rotor
assembly, which is a shaft or drum with blades attached on it. High velocity
moving fluid acts on blades so that they impart rotational energy to the rotor.
Turbines have a casing around the blades that contains and controls the working
fluid.A
working fluid contains potential energy (pressure head) and kinetic energy
(velocity head). The fluid may be compressible or incompressible.
Steam turbines are
used for the generation of electricity in thermal power plants, such as plants
using coal, fuel oil or
nuclear fuel.
Classification of Steam Turbine:
According to the working
principle:
Impulse Turbine
Reaction Turbine
According to the number of
Cylinder:
Single Cylinder Turbine
Double Cylinder
According to the method of
Governing:
Throttle Governing
Nozzle Control Governing
Bypass Governing
According to Steam Pressure:
Low Pressure Turbine (1.2 to 2 kg/cm2)
Medium Pressure Turbine (up to 40 kg/cm2)
High Pressure Turbine (40 to 170 kg/cm2)
Very High Pressure Turbine (170 to kg/cm2or
higher and temperature of 550 ºC)
Supercritical Turbine (225 kg/cm2)
According to shaft Arrangement:
Cross Compound
Tandem Compound
According to Direction of Flow:
Single Flow
Reverse Flow
According to the Direction of
Steam Flow:
Axial Turbine
Radial Turbine
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