TURBINE SECTION OF GAS TURBINE
INTRODUCTION
This is the
first assignment of the Industrial Gas Turbine where turbine section of gas
turbine is being explained elaborately in details. This task included all of
the sub-topics as mentioned below:
1
The function of the Turbine
Section of the Industrial Gas Turbine.
A diagram showing the
construction of Turbine Section which includes First Stage Nozzle, Second Stage
Nozzle, First Stage Turbine Wheel, Second Stage Turbine Wheels and Distance
Piece.
3 I. Types of Turbine Inspection.
II.The procedure for carrying out Combustion Inspection.
III.The uses of Borescope for Gas Turbine Inspection
(including diagram and labels).
a)The purpose of Preventive
Maintenance
b)The procedure for carrying out Major Inspection.
A turbine is a rotary engine
which is used to extract power from the hot air flow. This power will be needed
to drive the compressor. When the energy produce in the machine is transferred
from the fluid to the rotor, the machine is known as a turbine. A simple gas
turbine is comprised of three main sections that is a compressor, a combustor
and a power turbine.
The turbine section consists
of two, independently shafted, single stage turbines
that change high
velocity gas flow to rotating mechanical energy.
The compressor
Turbine
(also called the N1
turbine) rotates counterclockwise, rotating the axial
and centrifugal compressors and driving the
accessory gearbox. At 101.5%
maximum allowed (as indicated by the N1 gauge), the compressor
turbine will be rotating at 37,000 RPM. The power turbine (also called the Nf turbine) rotates
clockwise and imparts torque to the propeller shaft via a two
stage reduction gear
system. With
the propeller set at maximum RPM, the power turbine will
be rotating at 33,000 RPM. Between the two turbine wheels are eight temperature
sensing probes called thermocouples which provide
an indication of interstage-turbine temperature (ITT).
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