Exergy Analysis for a Gas Turbine Cogeneration System

1996 ◽  
Vol 118 (4) ◽  
pp. 782-791 ◽  
Author(s):  
Si-Doek Oh ◽  
Hyo-Sun Pang ◽  
Si-Moon Kim ◽  
Ho-Young Kwak
Keyword(s):  
Gas Turbine ◽  
Balance Equation ◽  
Exergy Analysis ◽  
Production Costs ◽  
Actual Performance ◽  
Exhaust Gases ◽  
Cogeneration System ◽  
Predicted Values ◽  
Exergoeconomic Analysis ◽  
Exergy Balance

A general exergy balance equation that is applicable to any component of thermal systems has been formulated in this study. One of distinct features of this formulation is that the exergy involved in the component of any thermal system can be decomposed into exergy flows, entropy production flows, and the appropriate exergy rate terms such as fuel and available work. The exergy analysis based on this equation permits one to predict the thermal efficiency of the system, the exergy destruction in each component as well as the mass flow rate, the composition, and the temperature of the exhaust gases. We have examined the performance of a 1000 kW gas turbine cogeneration system when it is operated at part and full-load conditions through this analysis. We have also tested the effect of the inlet air temperature and the relative humidity of the inlet air on the performance of the system. The predicted values of the performances for the system have been compared with the actual performance data provided by the gas turbine manufacturer. It has been found that the measured data of net power and the properties of exhaust gases are in good agreement with calculation ones, differing by less than 3 percent. The exergy balance equation may be utilized in the exergoeconomic analysis to estimate the production costs depending on various input costs in a gas turbine cogeneration system.

Exergy Analysis of Cogeneration System for the Wind–Solar–Gas Turbine Combined Supply

2018 ◽  
Vol 54 (5) ◽  
pp. 369-375 ◽  
Author(s):  
Wang Yanan ◽  
Wu Jiekang ◽  
Mao Xiaoming
Keyword(s):  
Gas Turbine ◽  
Exergy Analysis ◽  
Cogeneration System

A Comparison of the Predicted and Measured Thermodynamic Performance of a Gas Turbine Cogeneration System

1987 ◽  
Vol 109 (1) ◽  
pp. 32-38 ◽  
Author(s):  
J. W. Baughn ◽  
R. A. Kerwin
Keyword(s):  
Electric Power ◽  
Gas Turbine ◽  
Computer Model ◽  
Measurement Techniques ◽  
Actual Performance ◽  
Fuel Flow ◽  
Savings Rate ◽  
Thermodynamic Performance ◽  
Cogeneration System ◽  
Steam Production

The thermodynamic performance of a gas turbine cogeneration system is predicted using a computer model. The predicted performance is compared to the actual performance, determined by measurements, in terms of various thermodynamic performance parameters which are defined and discussed in this paper. These parameters include the electric power output, fuel flow rate, steam production, electrical efficiency, steam efficiency, and total plant efficiency. Other derived parameters are the net heat rate, the power-to-heat ratio, and the fuel savings rate. This paper describes the cogeneration plant, the computer model, and the measurement techniques used to determine each of the necessary measurands. The predicted and the measured electric power compare well. The predicted fuel flow and steam production are less than measured. The results demonstrate that this type of comparison is needed if computer models are to be used successfully in the design and selection of cogeneration systems.

Exergoeconomic analysis and performance assessment of selected gas turbine power plants

2015 ◽  
Vol 12 (3) ◽  
pp. 283-300 ◽  
Author(s):  
S.O. Oyedepo ◽  
R.O. Fagbenle ◽  
S.S. Adefila ◽  
Md. Mahbub Alam
Keyword(s):  
Combustion Chamber ◽  
Gas Turbine ◽  
Power Plants ◽  
Exergy Analysis ◽  
Unit Cost ◽  
Exergy Destruction ◽  
Improvement Potential ◽  
And Performance ◽  
Exergoeconomic Analysis ◽  
The Cost

In this study, exergoeconomic analysis and performance evaluation of selected gas turbine power plants in Nigeria were carried out. The study was conducted using operating data obtained from the power plants to determine the exergy efficiency, exergy destruction, unit cost of electricity and cost of exergy destruction of the major components of a gas turbine engine in the selected power plants. The results of exergy analysis confirmed that the combustion chamber is the most exergy destructive component compared to other cycle components as expected. The total efficiency defects and overall exergetic efficiency of the selected power plants vary from 38.64 to 69.33% and 15.66 to 30.72% respectively. The exergy analysis further shows that the exergy improvement potential of the selected plants varies from 54.04 MW to 159.88 MW. The component with the highest exergy improvement potential is the combustion chamber and its value varies from 30.21 MW to 88.86 MW. The results of exergoeconomic analysis show that the combustion chamber has the greatest cost of exergy destruction compared to other components. Increasing the gas turbine inlet temperature (GTIT), both the exergy destruction and the cost of exergy destruction of this component were found to decrease. The results of this study revealed that an increase in the GTIT of about 200 K can lead to a reduction of about 29% in the cost of exergy destruction. From exergy costing analysis, the unit cost of electricity produced in the selected power plants varies from cents 1.99 /kWh (N3.16 /kWh) to cents 5.65 /kWh (N8.98 /kWh).

LNG-Based Cogeneration Systems: Part 2—Advanced Exergy-Based Analyses of a Concept

2009 ◽  
Author(s):  
G. Tsatsaronis ◽  
T. Morosuk ◽  
F. Cziesla
Keyword(s):  
Energy Supply ◽  
Exergy Analysis ◽  
Liquefied Natural Gas ◽  
Thermodynamic Efficiency ◽  
The Past ◽  
The World ◽  
System Components ◽  
Cogeneration System ◽  
Exergoeconomic Analysis ◽  
Part Presentation

Liquefied Natural Gas (LNG) is expected to contribute in future more than in the past to the overall energy supply in the world. The paper is the second part of a two-part presentation. In the first one, some novel concepts for combining LNG regasification with the generation of electricity are discussed, whereas in the second part advanced exergy-based analyses are applied to the most favorable LNG–based cogeneration system. These analyses include an advanced exergy analysis and an advanced exergoeconomic analysis. With the aid of these analyses the interactions among system components as well as the potential for improving the thermodynamic efficiency and the potential for reducing the overall cost will be revealed. The objective of this paper is to demonstrate (a) the potential for generating electricity while regasifying LNG, and (b) the capabilities associated with advanced exergy-based methods.

Exergy analysis for a combined system of steam-injected gas turbine cogeneration and multiple-effect evaporation

2000 ◽  
Vol 214 (1) ◽  
pp. 61-73 ◽  
Author(s):  
Y-C Huang ◽  
C-I Hung ◽  
C-K Chen
Keyword(s):  
Gas Turbine ◽  
Exergy Analysis ◽  
Steam Injection ◽  
Utilization Efficiency ◽  
Thermal System ◽  
System Efficiency ◽  
Combined System ◽  
Small Influence ◽  
Cogeneration System ◽  
Exergy Losses

An exergy analysis has been used for a combination of steam-injected gas turbine cogeneration system and forward-feed triple-effect evaporation process, with and without vapour recompression. The fuel utilization efficiency, power—heat ratio and second-law efficiency are examined for evaluation of the thermal system performance. It is shown that the interaction between the combustion irreversibility and the exhaust exergy losses is dominant in governing the system efficiency with various steam injection ratios and feedstock mass flowrates. The compressor and gas turbine losses are shown to have a relatively small influence.

Exergy Analysis of an Integrated Gas Turbine Thermoacoustic Engine

2010 ◽  
Author(s):  
Kaveh Ghorbanian ◽  
Mohsen Karimi
Keyword(s):  
Gas Turbine ◽  
Power Output ◽  
Exergy Analysis ◽  
Waste Heat ◽  
Point Of View ◽  
Thermoacoustic Engine ◽  
Exhaust Gases ◽  
Energy And Exergy

An attempt is made to utilize exhaust gases of a small gas turbine in augmenting power output through the employment of a thermoacoustic system. It is assumed that the thermoacoustic system is powered only by the waste heat of the gas turbine. A comprehensive cycle analysis of the integrated gas turbine thermoacoustic engine “IGTTE” is carried out from energy and exergy point of view. Results indicate the thermodynamic advantages of the IGTTE.

scholarly journals Exergoeconomic Analysis of 21.6 MW Gas Turbine Power Plant in Riau, Indonesia

2021 ◽  
Vol 84 (1) ◽  
pp. 126-134
Author(s):  
Awaludin Martin ◽  
Nur Indah Rivai ◽  
Rahmat Dian Amir ◽  
Nasruddin
Keyword(s):  
Power Plant ◽  
Economic Analysis ◽  
Combustion Chamber ◽  
Gas Turbine ◽  
Exergy Analysis ◽  
Exergy Destruction ◽  
Exergetic Efficiency ◽  
Exergoeconomic Analysis ◽  
The Cost ◽  
Gas Turbine Power Plant

In this study, exergoeconomic analysis was carry out on a 21.6MW gas turbine power plant by using logbooks record Pekanbaru Unit. The exergy analysis was start to determine the exergy destruction of each component of the power plant based on the first and second laws of thermodynamics and in this study, exergy and economic analysis were combined and used to evaluate the accrued cost caused by irreversibility, including the cost of investment in each component. The exergy analysis results showed that the location of the largest destruction was in the combustion chamber with 21,851.18 kW, followed by the compressor and gas turbine with 8,495.48 kW and 3,094.34 kW, respectively. The economic analysis resulted that the total cost loss due to exergy destruction was 2,793.14$/hour, consisting of compressor 1,066.43$/hour, combustion chamber 1,561.46$/hour and gas turbine 165.25$/hour. The thermal and exergetic efficiency of gas turbine power plant were 24.51% and 22.73% respectively.

scholarly journals Exergoeconomic Analysis of a Combined Heat and Power System with the Micro Gas Turbine (MGTCHP)

2008 ◽  
Vol 26 (1) ◽  
pp. 53-70 ◽  
Author(s):  
Haydar Aras ◽  
Ozgur Balli
Keyword(s):  
Power System ◽  
Gas Turbine ◽  
Exergy Analysis ◽  
Electrical Power ◽  
Combined Heat And Power ◽  
Hot Water ◽  
Exergetic Efficiency ◽  
Micro Gas Turbine ◽  
Exergy Consumption ◽  
Exergoeconomic Analysis

This paper presents the results of exergy and exergoeconomic analyses applied to a combined heat and power system with micro-gas turbine (MGTCHP). Quantative balances of the exergy and exergy cost for each component and for the whole system are carefully considered, while exergy consumption and cost generation within the system are determined. The exergy analysis indicates that the exergetic efficiency of the MGTCHP system is 35.80% with 123 kW (as 99.15 kW-electrical power and 24.46 kW-hot [email protected] K). On the other hand, the exergoeconomic analysis results show that the unit exergy cost of electrical power and hot water produced by the MGTCHP system are accounted as 26.808 €(GW)−1 and 7.737 €(GW)−1, respectively.

scholarly journals Thermal performance of a gas turbine based on an exergy analysis

2019 ◽  
Vol 128 ◽  
pp. 01027
Author(s):  
Abdallah Haouam ◽  
Chaima Derbal ◽  
Hocine Mzad
Keyword(s):  
Energy Balance ◽  
Combustion Chamber ◽  
Gas Turbine ◽  
Thermal Performance ◽  
Exergy Analysis ◽  
Exergy Destruction ◽  
Equilibrium Equations ◽  
Air Compressor ◽  
Exergy Balance ◽  
Thermodynamic Processes

This work concerns the calculation and the analysis of the thermal performance of the components ofan MS 7001 type gas turbine with a nominal power of 87 MW using the concept of exergy. The exergy balance is used in addition to the energy balance to estimate the irreversibility of the air compressor, the combustion chamber and the turbine. The exergy analysis is carried out by applying the equilibrium equations obtained from the general definitions of the irreversibility of the thermodynamic processes and the data provided by the manufacturer. The results show that the exergy destruction of the gas turbine depends on the variation of the thermodynamic parameters: ambient temperature, compression ratio, air–fuel ratio. The combustion chamber has the highest exergy destruction estimated at 36.34 MW. The air compressor has an exergy efficiency of 84.19% that of the combustion chamber is 75.91% whilethat of the turbine expansion is 92.58%. The total exergy destruction of the gas turbine is 53.51 MW and itsefficiency is 32.44%. Improving the performance of the gas turbine requires decreasing the temperatureof the intake air.

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