Effect of Compression Ratio on Performance of Combined Cycle Gas Turbineijsrd.com
It is known the performance of a gas turbine (GT) has strong dependence of climate conditions. A suitable solution to minimize this negative effect is to raise inlet turbine temperature and reduce temperature of inlet air to GT compressor. Combined cycles gas turbines (CCGT) are a lot used to acquire a high-efficiency power plant. Increases the peak compression ratio has been proposed to improve the combined-cycle gas-turbine performance. The code of the performance model for CCGT power plant was developed utilizing the MATLAB software. The simulating results show that the overall efficiency increases with the increase of the peak compression ratio. The total power output increases with the increase of the peak compression ratio. The peak overall efficiency occurs at the higher compression ratio with low ambient temperature and higher turbine inlet temperature. The overall thermal efficiencies for CCGT are higher compared to gas-turbine plants.
Brayton cycle is a air standard cycle used to understand working of gas turbines. It is constant pressure cycle which shows how process are going in gas turbine.
Effect of Compression Ratio on Performance of Combined Cycle Gas Turbineijsrd.com
It is known the performance of a gas turbine (GT) has strong dependence of climate conditions. A suitable solution to minimize this negative effect is to raise inlet turbine temperature and reduce temperature of inlet air to GT compressor. Combined cycles gas turbines (CCGT) are a lot used to acquire a high-efficiency power plant. Increases the peak compression ratio has been proposed to improve the combined-cycle gas-turbine performance. The code of the performance model for CCGT power plant was developed utilizing the MATLAB software. The simulating results show that the overall efficiency increases with the increase of the peak compression ratio. The total power output increases with the increase of the peak compression ratio. The peak overall efficiency occurs at the higher compression ratio with low ambient temperature and higher turbine inlet temperature. The overall thermal efficiencies for CCGT are higher compared to gas-turbine plants.
Brayton cycle is a air standard cycle used to understand working of gas turbines. It is constant pressure cycle which shows how process are going in gas turbine.
In any thermal power generation plant, heat energy converts into mechanical work. Then it is converted to electrical energy by rotating a generator which produces electrical energy.
Gas turbine is an important topic usually studied in mechanical engineering, aeronautical engineering, power plant engineering, electrical engineering, and some other related engineering branches. The gas turbine is an air breathing heat engine, said to be the heart of the power plant produces electric power, by burning of gas (or) liquid fuels along with fresh air. The fresh air performs two main functions in gas turbine. The fresh air acts as a cooling agent for various parts of the power plants and gives required amount of oxygen for combustion of fuel. Topics covered in the ppt
Gas Turbines: Simple gas turbine plant- Ideal cycle, closed cycle and open cycle for gas turbines Efficiency, work ratio and optimum pressure ratio for simple gas turbine cycle Parameters of performance- Actual cycle, regeneration, Inter-cooling and reheating. the topics covered are almost same in all the universities. some problems were discussed in each and concept to make them understand clearly.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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field of an area of 3,025.25 square kilometres on geographical latitude 7o00' N to N o ' 7 30 and longitude
E o ' 3 00 to E o ' 3 30 within Abeokuta area, using local wavenumber method. This study was carried out using
digitised airborne magnetic data of basement complex formation. Structural interpretation of the magnetic data
was achieved through applying advanced processing techniques that provide automatic delineation and depth
estimation of the magnetic structures. Local wavenumber method was used for locating and estimating depth to
magnetic contact. The magnetic contact depth ranges from 0.145km to 2.692km.
In any thermal power generation plant, heat energy converts into mechanical work. Then it is converted to electrical energy by rotating a generator which produces electrical energy.
Gas turbine is an important topic usually studied in mechanical engineering, aeronautical engineering, power plant engineering, electrical engineering, and some other related engineering branches. The gas turbine is an air breathing heat engine, said to be the heart of the power plant produces electric power, by burning of gas (or) liquid fuels along with fresh air. The fresh air performs two main functions in gas turbine. The fresh air acts as a cooling agent for various parts of the power plants and gives required amount of oxygen for combustion of fuel. Topics covered in the ppt
Gas Turbines: Simple gas turbine plant- Ideal cycle, closed cycle and open cycle for gas turbines Efficiency, work ratio and optimum pressure ratio for simple gas turbine cycle Parameters of performance- Actual cycle, regeneration, Inter-cooling and reheating. the topics covered are almost same in all the universities. some problems were discussed in each and concept to make them understand clearly.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Depth Estimation and Source Location of Magnetic Anomalies from a Basement Co...IOSR Journals
Source locations and depths to magnetic contacts were estimated from the total intensity magnetic
field of an area of 3,025.25 square kilometres on geographical latitude 7o00' N to N o ' 7 30 and longitude
E o ' 3 00 to E o ' 3 30 within Abeokuta area, using local wavenumber method. This study was carried out using
digitised airborne magnetic data of basement complex formation. Structural interpretation of the magnetic data
was achieved through applying advanced processing techniques that provide automatic delineation and depth
estimation of the magnetic structures. Local wavenumber method was used for locating and estimating depth to
magnetic contact. The magnetic contact depth ranges from 0.145km to 2.692km.
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embedded in an insulating material. This system, assumed to a series of flattened cylindrical quantum dots with
a finite barrier at the boundary, is studied using the triangular potential. The electronic states and the effective
mass of 1 Γ miniband have been computed as a function of inter-quantum dot separation for different zinc
compositions. Calculations have been made for electrons, heavy holes and light holes. Results are discussed and
compared with those of the Kronig-Penney and sinusoidal potentials
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cement processing. The rotary Kiln in which cement is burnt at 13000C to 15500C is a long cylinder rotating on
its axis and inclined so that the materials fed in at the upper end travel slowly to the lower end.
The approach adopted is by evolving a mathematical model of the system. Simulation of the process was carried
out using FORTRAN language to compute theoretical heat of formation. The exact value of theoretical heat of
formation was found to be 435.583000.
The aim is to produce a good quality clinker at the optimum fuel consumption and thermal efficiency.
The computer model is in a FORTRAN language. The simulation provides very encouraging result, which
showed trends that enabled the deduction of optimum system parameters.
Significance: This paper investigated the behavior of the kiln through computer simulations, for comparing
the performance of different constitutions under similar operations and conditions. The paper highlighted how a
good quality clinker can be produced at optimum fuel consumption and thermal efficiency.
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Each fish was measured and weight was taken. Log transformed regressions were used to test the growth trend. It was observed that growth in weight is not proportional to the cube of its length. Coefficient of correlation values for both male and female as well as for mixed population were found to be highly significant.
Thermal Analysis of Steam Turbine Power PlantsIOSR Journals
: Steam are a major energy consumer. Optimising process operating conditions can considerably
improve turbine water rate, which in turn will significantly reduce energy requirement. Various operating
parameters affect condensing and back pressure turbine steam consumption and efficiency. The industrial
sector is the largest energy consumer, accounting for about 30 % of total energy used. Fuel and energy prices
are continuously rising. With the present trend of energy prices and scarcity of hydrocarbon resources lowering
energy requirement is a top priority. Energy conservation benefits depend on the adopting minor or major
modifications and using the latest technology. Turbines are designed for a particular operating conditions like
steam inlet pressure, steam inlet temperature and turbine exhaust pressure/ exhaust vacuum, which affects the
performance of the turbines in a significant way. Variations in these parameters affects the steam consumption
in the turbines and also the turbine efficiency. The present study was done to improve the power output of the
turbine, thermal efficiency and specific steam consumption in conventional steam power plants. Three cycles i.e
regenerative cycle, superheater cycle and cogeneration cycle are considered to formulate the data and obtain a
better result in steam turbine power plants
Now a day’s power generation is most important for
every country. This power is generated by some thermal
cycles. But single cycle cannot be attain complete power
requirements and its efficiency also very low so that to fulfill
this requirements to combine two or more cycles in a single
power plant then we can increase the efficiency of the power
plant. Its increased efficiency is more than that of if the plant
operated on single cycle. In which we are using two different
cycles and these two cycles are operated by means of different
working mediums. These type of power plants we can called
them like combined cycle power plants. In combined cycle
power plants above cycle is known as topping cycle and below
cycle is known as bottoming cycle. The above cycle generally
brayton cycle which uses air as a working medium. When the
power generation was completed the exhaust gas will passes
in to the waste heat recovery boiler. Another cycle also
involved in bottoming cycle. This cycle works on the basis on
rankine cycle. In which steam is used as working medium.
The main component in bottoming cycle is waste heat
recovery boiler. It will receive exhaust heat from the gas
turbine and converts water in to steam. The steam used for
generating power by expansion on steam turbine. Combined
cycle power plants are mostly used in commercial power
plants.
In this paper we are analyzing one practical
combined cycle power plant. In practical conditions due to
some losses it can not be generates complete power. So that
we are invistigated why it is not give that much of power and
the effect of various operating parameters such as maximum
temperature and pressure of rankine cycle, gas turbine inlet
temperature and pressure ratio of Brayton cycle on the net
output work and thermal efficiency of the combine cycle
power plant.
The outcome of this work can be utilized in order to
facilitate the design of a combined cycle with higher efficiency
and output work. Mathematical calculations and simple
graphs in ms excel, and auto cad has been carried out to
study the effects and influences of the above mentioned
parameters on the efficiency and work output.
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Epistemic Interaction - tuning interfaces to provide information for AI support
N012229496
1. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)
e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 12, Issue 2 Ver. II (Mar - Apr. 2015), PP 94-96
www.iosrjournals.org
DOI: 10.9790/1684-12229496 www.iosrjournals.org 94 | Page
Performance Analysis of Regenerative System and Improvement
of Turbine Efficiency
1
Saravanan. S, 2
S. Mohammed Shafee M. E; (PhD)
[1]
P.G scholar, M.tech (Thermal Engineering), Hindustan University, OMR, Padur, Chennai, Tamil Nadu, India.
[2]
Associate Professor, Department of Mechanical Engineering, Hindustan University,
OMR, Padur, Chennai, Tamil Nadu, India.
Abstract: A thermal power station is a plant in which the prime mover is steam driven. Water is heated, turns
into steam and spins a steam turbine which drives an electrical generator. After it passes through the turbine,
then the steam is condensed in a condenser and it is recycled. The thermal efficiency is about 45% to 47%. The
steam which enters the turbine is extracted to heaters. The extracted steam is used by heaters to heat the feed
water. The heaters are connected by means of cascading system. But the cascading is separate for high pressure
and low pressure heaters. So the drip after high pressure heater is sent to de aerator. This is the problem in this
system. Due to this the efficiency of the turbine decreases and large amount of heat in the heater is wasted in the
de aerator.If the cascading is done between high pressure and low pressure heater then the waste heat to de
aerator can be carried to the low pressure heaters so the waste heat is utilized fully by the heaters. This will
increase the efficiency of turbine system. And by analyzing the pressure reducing de superheating station near
boiler will improve the efficiency. The maximum work done in the turbine will increase the efficiency and
recovering the waste heat in the regenerative system helps to increase the temperature of the feed water. In
thermodynamic power cycles, an improvement of even 0.5% in overall cycle efficiency is an important gain. In
power plant, analysis of regenerative system is important.
Index Terms: high pressure heaters, deaerator, turbine, PRDS station.
I. Introduction
The steam which is extracted from the turbine at various stages.There are about 21 stages of extraction
in turbine. The steam from turbine enters into the heaters. There are about three HP heaters and four LP heaters
two glance steam coolers, one de aerator in this system. These are placed in between the condenser and the
economizer. The steam normally flows in the shell of the heaters, these heaters are nothing but a shell and tube
heat exchangers in which feed water flows inside the tube the steam and the drip flows outside the tube. The
water and the steam flows in a counter flow direction. Normally the steam after turbine enters into the
condenser. The steam loses its heat in the condenser at 42o
C to increase the temperature of feed water to 245o
C
in the boiler these heatersare used. To rise the temperature of feed water from 42 to 245o
C these heaters are
used. By cascading system the temperature of feed water is increased.
II. Working Of Heaters
The heaters in this system are normally connected by means of cascading system, cascading between
HP heaters to de aerator and deaerator to LP heaters, but there is no cascading operation between HP heaters and
LP heaters, so enormous amount of heat is wasted in de aerator. The steam loses its heat in each and every
heater and forms as a drip. Finally these drip are commonly collected in the drip pump for recirculation. The
feed water from condenser enters into these heaters to increase the temperature and pressure. The water after
passing through four LP heaters enters into the HP heaters and then it enter in to economizer at a temperature of
245o
C.During this passage the feed water gains the heat from the heaters for boiler operation. Normally boiler
converts the steam at a temperature of 540o
C and 130ksc of pressure. The heaters are used to boost up the
temperature and pressure of the feed water before it enters into the turbine.
III. Modification
Cascading between the heaters helps to recover the waste heat, so redesign of HP heater will lead to
cascading between heaters without de aerator. There is no cascading operation between heaters due to
temperature difference. So by reducing the drip temperature in the HP heater the cascading will be possible. For
that the heat in the drip must be fully utilized by the feed water. So the number of coils in the HP heater to be
increased. By increasing the number of coils in the heater will increase the flow rate of water and drip and the
time to travel in the heater also increased, so the drip loses its heat to feed water. This helps to have a cascade
between the heaters.
2. Performance Analysis Of Regenerative System And Improvement Of Turbine Efficiency
DOI: 10.9790/1684-12229496 www.iosrjournals.org 95 | Page
From boiler the amount of the steam is not fully enters into the turbine for PRDS flow about 15T/hr of steam is
taken at the boiler outlet, so the work done in the turbine is decreased. In order to have maximum work done the
PRDS must be taken at the HP turbine outlet, so the maximum work done is done in HP turbine it will helps to
increase the turbine efficiency.
Top view of high pressure heater
Isometric view of high pressure heater
PRDS vs CRH.(667T/hr)
PRDS flow=15T enthalpy=2790.9KJ/kg
Temp=200o
C pressure=14.5kg/cm2
CRH flow=652T/hr enthalpy=3140KJ/kg
Temp=330o
C pressure=26.04kg/cm2
Heat loss=15*(3140-2790.9)
=5236.5*103
KJ/hr
Work Done In Hpt
MS flow=667T/hr (without PRDS flow)
=MS flow*(MS enthalpy-HPH7 E.S enthalpy)*103
+(MS flow-HPH7 E.S flow)* (HPH7 E.S enthalpy-CRH
enthalpy)= 667*(3500-3210)+(667-33.5)*(3210-3140)
Work done in HPT=238645*103
KJ.
Excess Work done by HPT with 667T=238645-193676.10(existing)
=44968.9*103
KJ
Turbine Efficiency
Work done in HPT (without PRDS flow)=238645
Work done in IPT =125212.2
Work done in LPT =421807.57
Total work done in turbine =785664.79*103
KJ
3. Performance Analysis Of Regenerative System And Improvement Of Turbine Efficiency
DOI: 10.9790/1684-12229496 www.iosrjournals.org 96 | Page
TURBINE EFFICIENCY =785664.79/1775020.16=44.26%=44.26%
EXISTING EFFICIENCY=41.72%
IV. Estimation
Estimation for increasing the number of coils in the heater depends on the amount of heat gained by
feed water. For cascading the outlet of feed water is about 194.2o
C in HP heater 5 so the cascading is done
between HPH to LPH. And the drip temperature is to be at 110o
C.
So the amount of heat gained by feed water at an outlet temperature of about 194.2o
C can be calculated
Drip temp=110o
C enthalpy of steam=3420KJ/kg
=((211*4.184*0.05)+(211*4.184*0.06)+(3420*4.184*0.02))+707.9=((110*4.184*0.05)+(110*4.184*0.06)+(11
0*4.184*0.02))+x
=44.14+52.96+68.4+707.09=23.01+27.61+9.20+x
=872.59=59.82+x
X=812.77/4.184(enthalpy of feed water oulet)
X=194.2o
c (outlet temp)
HPH 5 FOR DRIP OUTLET 110deg.Cqty =670T/hr.
Feed water inlet=169deg.c feed water outlet=194.2o
C
Qty of ES 5=13.4T/hr drip qty=(40.2+33.5)
FS temp=458deg.c drip temp=110deg.c
Pre=11.92kg/cm2
enthalpy=461.3KJ/kg
Enthalpy=3400KJ/kg drip enthalpy of 6=920.6KJ/kg
Heat gained by water=670*4.184*(194.2-169) =70082.1*103
KJ/hr
Heat loss by ES=qty*enthalpy=13.4*(3420-461.3)=39378.58*103
KJ/kg
Heat loss by drip=73.7*(920.6-461.3)=33850.41*103
KJ/kg
Heat loss by drip and steam at 110deg.c =(39378.58+33850.41)=73228.99*103
KJ/hr
Heat loss by drip and steam at 188deg.C=43374.94*103
KJ/hr
Heat gained by water=(73228.99-43374.97)=29854.02*103
KJ/hr
Benefits
By increasing the number the coils in the heaters the heat is recovered, so there is no additional supply
of the heat By changing the flow of PRDS the efficiency of turbine is increased to 3%. So the overall thermal
efficiency of the plant is increased.
V. Results
By this we came to know clearly that if the cascading system between the heaters is perfectly done, the
efficiency of the turbine and the heater can be increased.And the waste heat is utilized properly in the heaters.
And analyzing the PRDS flow at the turbine inlet will give better flow rate of steam and this will helps to
increase the overall thermal efficiency of the plant.
References
[1]. Aziz Siman, Thermal Engineering”Feedwater Heater Application of T-22 Tubing”
[2]. Ch.vijaya kumar, Dhananjaya kumar” Performance and analysis of regenerative feed water heating in steam plant” e-ISSN 2278-
1684,volume 11, issue 2 ver.v mar/apr.2014
[3]. Donald Q. kern” process heat transfer” D.Q associates and lecture in chemical engineering, case institute of technology
[4]. Durgeshbhatt “Shell and tube heat exchanger performance analysis” IJSR. ISSN-2319 7064 .2012
[5]. R.sankar subramanian “shell and tube heat exchangers”.
[6]. Sadik kakac“ Heat exchangers selection, rating and thermal design” department of mechanical engineering, university of Miami.
[7]. Tokarz T “Evaluation of performance parameters of the extraction condensing type power unit at a combined heat and power plant”
in mechanics vol.25 No.2 2006.
[8]. T.Lakshmi Priyanka, K.R.S. Narayanan, T. Jayanthi, K.K.KuriaKose, S.A.V SatyaMurty “Process Modeling and Simulation of
Feedwater Heaters Drains and Vents System of PFBR” Intelligent Systems and Applications, 2013, 11, 62-69.
[9]. William L. Viar, PE” Regenerative feed water heater economics”ESL-IE-86-06-37.2009.