You will learn about the gas turbine power plant and method to improve the efficiency of gas turbine power plant

1. GAS TURBINE POWER
PLANT
Methods to Improve Efficiency
Hamza Bashir
FA19-REE-016

2. CONTENT
• Introduction
• Classification
• Efficiency improvement methods
• Conclusion
• References
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3. INTRODUCTION
G A S T u r b i n e P o w e r P l a n t
• Gas turbines have been used for electricity generation in the periods
of peak electricity demand.
• Gas turbines can be started and stopped quickly enabling them to be
brought into service as required to meet energy demand peaks.
• Small unit sizes and their low thermal efficiency restricted the
opportunities for their wider use for electricity generation.
• The Thermal efficiency of the gas turbine is 20 to 30% compared with
the modern steam power plant 38 to 40%.
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4. CLASSIFICATION
G A S T u r b i n e P o w e r P l a n t
By Application:
• Air craft
• Stationary
• Locomotive
• Marine
• Transport
By Cycle:
• Open
• Closed
• Semi closed
By Fuel:
• Solid fuel
• Liquid fuel
• Gaseaos fuel
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According to Arrangement:
• Simple
• Single Shaft
• Multi Shaft
• Inter cooled
• Reheat
• Regenerative
• Combination
According to combustion:
• Continuous combustion
• Intermittent combustion

5. EFFICIENCY IMPROVEMENT
G A S T u r b i n e P o w e r P l a n t
There are three method to improve efficiency of gas turbine power plant
• Intercooling
A compressor utilizes the major percentage of power developed by the
gas turbine. The work required by the compressor can be reduced by
compressing the air in two stages and incorporation a intercooler
between the two.
• Reheating
The output of gas turbine can be improved by expanding the gasses in two
stages with a reheater between the two.
The H.P. turbine drives the compressor and the LP turbine provides
useful power output
• Regeneration
The exhaust gasses from the turbine carry a large quantity of heat with
them since their temperature is far above the ambient temperature.
They can be used to heat air coming from the compressor there by
reducing the mass of fuel supplied in the combustion chamber.
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6. GAS TURBINE POWER PLANT
W i t h I n t e r c o o l i n g
• In Intercooling a heat exchanger is used to cool the
compressor gases at the time of compression process.
• When the compressor involves the high and low
pressure unit in it, the intercooler could be installed
between them to cool down the flow.
• This cooling process will decrease the work needed for
the compression in the high pressure unit. The cooling
fluid can be water , air.
• In marine gas turbines the sea water is used to cool the
fluid. It is observed that a successful implementation of
the intercooler can improve the gas turbine output .
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7. GAS TURBINE POWER PLANT
W i t h R e h e a t i n g
• Reheating is applied in a gas turbine in such a way that it
increases the turbine work without increasing the
compressor work or melting the turbine materials.
• When a gas turbine plant has a high pressure and low
pressure turbine a reheater can be applied successfully.
• Reheating can improve the efficiency up to 3 % .
• A reheater is generally is a combustor which reheat the
flow between the high and low pressure turbines.
• In jet engines an afterburner is used to reheat. It is
attached at the exhaust of the turbine. As a result the
thrust is increased. But it takes a lot of fuel to increase
the thrust .
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8. GAS TURBINE POWER PLANT
W i t h R e g e n e r a t i o n
• Regeneration process involves the installation of a heat
exchanger in the gas turbine cycle.
• The heat-exchanger is also known as the recuperater.
• This heat exchanger is used to extract the heat from the
exhaust gas .
• This exhaust gas is used to heat the compressed air.
• This compressed and pre-heated air then enters the
combustors.
• When the heat exchanger is well designed , the effectiveness is
high and pressure drops are minimal.
• when these heat exchangers are used an improvement in the
efficiency is noticed. Regenerated Gas turbines can improve the
efficiency more than 5 % .
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9. Conclusion
Methods presented in previous slides can enable us to develop
highly efficient models for Gas Turbines Power Plants.
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10. REFERENCES
[ 1 ] h t t p s : / / n p t e l . a c . i n / c o n t e n t / s t o r a g e 2 / c o u r s e s / 1 0 1 1 0 1 0 0
2 / d o w n l o a d s / L e c t - 0 6 . p d f
[ 2 ] h t t p s : / / t w u g b c n . f i l e s . w o r d p r e s s . c o m / 2 0 1 1 / 0 3 / t h e -
b r a y t o n - c y c l e - w i t h - r e g e n e r a t i o n . p d f
[ 3 ] h t t p s : / / b a s i c m e c h a n i c a l e n g i n e e r i n g . c o m / g a s - t u r b i n e -
p o w e r - p l a n t - w i t h - r e g e n e r a t i o n - r e h e a t -
i n t e r c o o l i n g / # G a s _ T u r b i n e _ o r _ B r a y t o n _ C y c l e _ W i t h _ R e h e a t
_ , _ R e g e n e r a t i o n _ a n d _ I n t e r c o o l i n g
[ 4 ] h t t p s : / / w w w . e n g i n e e r i n g e n o t e s . c o m / m e c h a n i c a l -
e n g i n e e r i n g / g a s - t u r b i n e / t o p - 6 - m e t h o d s - t o - i m p r o v e - t h e -
e f f i c i e n c y - o f - g a s - t u r b i n e / 5 0 5 0 3
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