Exergy Analysis of Modern Fossil-Fuel Power Plants

1999 ◽  
Vol 122 (1) ◽  
pp. 1-7 ◽  
Author(s):  
J. H. Horlock ◽  
J. B. Young ◽  
G. Manfrida
Keyword(s):  
Power Plants ◽  
Exergy Analysis ◽  
Reversible Process ◽  
Turbine Plant ◽  
Maximum Work ◽  
Gas Turbine Plant ◽  
Definition Of ◽  
Fossil Fuel Power Plants ◽  
Ideal Process ◽  
The Ideal

The definition of open cycle rational efficiency is unequivocally based on the ratio of the actual shaft work output from a power plant to the maximum work that could be obtained in a reversible process between prescribed inlet and outlet states. However, different constraints may be applied to such an ideal reversible process, and the maximum work obtainable will then vary, as will the value of the rational efficiency. Attention has been drawn to this issue before in the literature and it is discussed further here. In particular, the consequences of defining the outlet state for the ideal process are critical. A further complication occurs when water or steam is injected into a gas turbine plant. Three definitions of rational efficiency are discussed here and some illustrative calculations presented. There are small but significant differences between the values of the three derived efficiencies. [S0742-4795(00)00101-0]

Thermodynamic Study of Humid Air Gas Turbine Cycle Power Plants

2005 ◽  
Author(s):  
R. Yadav ◽  
P. Sreedhar Yadav
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Power Plants ◽  
Substantial Reduction ◽  
Thermodynamic Study ◽  
Humid Air ◽  
Turbine Plant ◽  
Design Engineers ◽  
Gas Turbine Plant ◽  
Gas Turbine Cycle

The major challenges before the design engineers of a gas turbine plant and its variants are the enhancement of power output, substantial reduction in NOx emission and improvement in plant thermal efficiency. There are various possibilities to achieve these objectives and humid air gas turbine cycle power plant is one of them. The present study deals with the thermodynamic study of humid air gas turbine cycle power plants based on first law. Using the modeling and governing equations, the parametric study has been carried out. The results obtained will be helpful in designing the humid air gas turbines, which are used as peaking units. The comparison of performance of humid air gas turbine cycle shows that it is superior to basic gas turbine cycle but inferior and more complex to steam injected cycle.

Using Experimental Data for Predicting Performance and Emissions of a Real Gas Turbine Plant

2002 ◽  
Author(s):  
Andrea Lazzaretto ◽  
Andrea Toffolo ◽  
Sebastiano Trolese
Keyword(s):  
Experimental Data ◽  
Gas Turbine ◽  
Power Plants ◽  
Water Injection ◽  
Thermodynamic Quantities ◽  
Emission Model ◽  
Ambient Conditions ◽  
Turbine Plant ◽  
Real Gas ◽  
Gas Turbine Plant

Precise performance evaluation at design and off-design operations is needed for a correct management of power plants. This need is particularly strong in gas turbine power plants which can quickly react to load variations and are very sensitive to ambient conditions. The paper aims at presenting a simple tool to determine the values of the thermodynamic quantities in each point of the plant and the overall plant performances of a real gas turbine plant. Starting from experimental data, a zero-dimensional model is developed which properly considers the effect of ambient conditions and water injection for pollutant abatement at different load settings under the action of the control system. An emission model taken from the literature is also included, after tuning on experimental data, to predict carbon monoxide and nitrogen oxide pollution.

Combined Helium and Combustion Gas Turbine Plant Exploiting Liquid Hydrogen (LH2) Physical Exergy

1996 ◽  
Vol 118 (2) ◽  
pp. 257-264 ◽  
Author(s):  
G. Bisio ◽  
A. Massardo ◽  
A. Agazzani
Keyword(s):  
Gas Turbine ◽  
Exergy Analysis ◽  
Liquid Hydrogen ◽  
Combined System ◽  
Turbine Plant ◽  
Combustion Gas ◽  
Waste Gas ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Gas Turbine Plant

The aim of this work is the energy and exergy analysis of a combined plant made up of a conventional gas turbine (heavy-duty or aeroderivative) and a closed helium turbine cycle, which exploits liquid hydrogen (LH2) as a lower energy source. A helium turbine with the characteristics of the fluid allows us to operate between the usual temperatures of the top turbine waste gas and those of the liquid hydrogen available. In this way the combined system reaches efficiency values greater than every combined system proposed to date. The work contains a detailed analysis of the relative entropy productions of the helium cycle and considerations about the realization and technological aspects of helium turbines.

scholarly journals Technical and economic assessment of the parameters of thermal schemes of thermal power plants with a hydrogen generator

2021 ◽  
Vol 23 (2) ◽  
pp. 84-92
Author(s):  
G. E. Marin ◽  
B. M. Osipov ◽  
A. R. Akhmetshin
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Power Plants ◽  
Turbine Unit ◽  
Thermal Power ◽  
Component Composition ◽  
Automated System ◽  
Gas Turbine Unit ◽  
Turbine Plant ◽  
Gas Turbine Plant

THE PURPOSE. The study is aimed at studying the effect of fuel gases of various component composition on the environmental performance of the GE 6FA gas turbine unit. Consider using hydrogen as primary sweat to minimize emissions and improve performance of the GE 6FA gas turbine. METHODS. To achieve this goal, the ASGRET (Automated system for gas-dynamic calculations of power turbomachines) software package was used. RESULTS. The article discusses promising directions for the utilization of CO2 using highly efficient technologies with further use or disposal. A mathematical model of a GE 6FA gas turbine unit, diagrams of changes in the main characteristics and the composition of emissions when operating on various types of fuel, including hydrogen, are presented. CONCLUSION. The studies carried out show that a change in the component composition of the gas affects the energy characteristics of the engine. The method for determining the quantitative composition of COx, NOx, SOx in the exhaust gases of a gas turbine plant is presented. The transition to the reserve fuel kerosene leads to an increase in the amount of emissions, which must be taken into account when designing systems for capturing harmful emissions with a dual-fuel fuel gas supply system. The use of hydrogen as a fuel for gas turbines allows to reduce not only the cost of fuel preparation, but also to minimize emissions and improve the performance of the gas turbine plant.

scholarly journals Defining and selecting independent directors

2017 ◽  
Vol 6 (3) ◽  
pp. 37-45
Author(s):  
Eric Pichet
Keyword(s):  
Boards Of Directors ◽  
Independent Directors ◽  
Independent Director ◽  
Governance System ◽  
Shareholder Theory ◽  
Theoretical Paper ◽  
Nominating Committees ◽  
Definition Of ◽  
Ideal Process ◽  
The Ideal

Drawing from the Enlightened Shareholder Theory that the author first developed in 2011, this theoretical paper with practical and normative ambitions achieves a better definition of independent director, while improving the understanding of the roles he fulfils on boards of directors. The first part defines constructs like firms, Governance system and Corporate governance, offering a clear distinction between the latter two concepts before explaining the four main missions of a board. The second part defines the ideal independent director by outlining the objective qualities that are necessary and adding those subjective aspects that have turned this into a veritable profession. The third part defines the ideal process for selecting independent directors, based on nominating committees that should themselves be independent. It also includes ways of assessing directors who are currently in function, as well as modalities for renewing their mandates. The paper’s conclusion presents the Paradox of the Independent Director.

AVAILABILITY OF AN INTERMITTENTLY REQUIRED SYSTEM: APPLICATION TO A FOSSIL FUEL POWER PLANT

2001 ◽  
Vol 08 (03) ◽  
pp. 259-269
Author(s):  
MARC BOUISSOU ◽  
YANNICK LEFEBVRE
Keyword(s):  
Mathematical Method ◽  
Power Plant ◽  
Nuclear Power ◽  
Power Plants ◽  
Fossil Fuel ◽  
Electricity Consumption ◽  
Production Loss ◽  
Fossil Fuel Power Plant ◽  
Definition Of ◽  
Fossil Fuel Power Plants

Electricité de France produces about 75% of its electricity with nuclear power plants. Some hydraulic plants and most fossil fuel power plants are used to pass electricity consumption peaks. Therefore these facilities are required only intermittently. For such systems, a breakdown does not result in a production loss during a standby period. This particular feature is not taken into account by conventional availability evaluation methods. The objective of this paper is to introduce a definition of availability which holds in such a context, and to describe a mathematical method suited to the calculation of this new definition of availability.

scholarly journals Gas Turbine Tubular Coilpipes Regenerators Optimized According to the Minimum Mass Criterion

2021 ◽  
Vol 2(50) ◽  
Author(s):  
Viktor Gorbov ◽  
◽  
Sergey Movchan ◽  
Denis Solomonyuk ◽  
◽  
...  
Keyword(s):  
Heat Exchange ◽  
Gas Turbine ◽  
Heat Exchangers ◽  
Power Plants ◽  
Geometrical Parameters ◽  
Metal Consumption ◽  
Turbine Plant ◽  
Gas Turbine Plant ◽  
Exchange Matrix

The aim of this work is to determine the effect of the elements, which do not participate in heat transfer, on the mass of the regenerator of a gas turbine plant X, as well as to define the re-strictions that are imposed on the regenerator design based on the conditions of manufacturabil-ity, placement at the facility and transportability. This goal is achieved using an algorithm for finding rational geometric parameters of the heat exchange matrix with minimization of the re-generator mass by Newton's method. It has been determined that the mass of the heat exchange matrix can be 0.48–0.58 of the mass of the regenerator. This makes it necessary, even at the initial design stages, to take into account the effect of the above factors on the mass of the re-generator and the choice of the rational geometrical parameters. A significant result of the stud-ies performed is determination of the effect of dimensional restrictions and requirements for the shape of the regenerator to be increased in its mass. The values of the geometrical parameters of the heat exchange matrix were obtained, at which the mass of the regenerator takes on a mini-mum value. The significance of the work is that the obtained relationships between the mass of the regenerator and its geometry makes it possible to reduce the metal consumption of the regen-erator and the gas turbine plant, which allows designing the heat exchangers for power plants

scholarly journals Combined Helium and Combustion Gas Turbine Plant Exploiting Liquid Hydrogen (LH2) Physical Exergy

1995 ◽  
Author(s):  
Giacomo Bisio ◽  
Aristide Massardo ◽  
Alessio Agazzani
Keyword(s):  
Gas Turbine ◽  
Exergy Analysis ◽  
Liquid Hydrogen ◽  
Combined System ◽  
Turbine Plant ◽  
Combustion Gas ◽  
Waste Gas ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Gas Turbine Plant

The aim of this work is the energy and exergy analysis of a combined plant made up of a conventional gas turbine (heavy-duty or aeroderivative) and a closed helium turbine cycle which exploits liquid hydrogen (LH2) as a lower exergy source. A helium turbine with the characteristics of the fluid allows us to operate between the usual temperatures of the top turbine waste gas and those of the liquid hydrogen available. In this way the combined system reaches efficiency values greater than every combined system proposed to date. The work contains a detailed analysis of the relative entropy productions of the helium cycle and considerations about the realization and technological aspects of helium turbines.

scholarly journals Impact of inlet fogging and fuels on power and efficiency of gas turbine plants

2013 ◽  
Vol 17 (4) ◽  
pp. 1107-1117
Author(s):  
Mehaboob Basha ◽  
S.M. Shaahid ◽  
Luai Al-Hadhrami
Keyword(s):  
Saudi Arabia ◽  
Natural Gas ◽  
Gas Turbine ◽  
Air Temperature ◽  
Power Plants ◽  
Computational Study ◽  
Electricity Price ◽  
Fuel Price ◽  
Turbine Plant ◽  
Gas Turbine Plant

A computational study to assess the performance of different gas turbine power plant configurations is presented in this paper. The work includes the effect of humidity, ambient inlet air temperature and types of fuels on gas turbine plant configurations with and without fogger unit. Investigation also covers economic analysis and effect of fuels on emissions. GT frames of various sizes/ratings are being used in gas turbine power plants in Saudi Arabia. 20 MWe GE 5271RA, 40 MWe GE-6561B and 70 MWe GE-6101FA frames are selected for the present study. Fogger units with maximum mass flow rate of 2 kg/s are considered for the present analysis. Reverse Osmosis unit of capacity 4 kg/s supplies required water to the fogger units. GT PRO software has been used for carrying out the analysis including; net plant output and net efficiency, break even electricity price and break even fuel LHV price etc., for a given location of Saudi Arabia. The relative humidity and temperature have been varied from 30 to 45 % and from 80 to 100? F, respectively. Fuels considered in the study are natural gas, diesel and heavy bunker oil. Simulated gas turbine plant output from GT PRO has been validated against an existing gas turbine plant output. It has been observed that the simulated plant output is less than the existing gas turbine plant output by 5%. Results show that variation of humidity does not affect the gas turbine performance appreciably for all types of fuels. For a decrease of inlet air temperature by 10 ?F, net plant output and efficiency have been found to increase by 5 and 2 %, respectively for all fuels, for GT only situation. However, for GT with Fogger scenario, for a decrease of inlet air temperature by 10 ?F, net plant output and efficiency have been found to further increase by 3.2 and 1.2 %, respectively for all fuels. For all GT frames with fogger, the net plant output and efficiency are relatively higher as compared to GT only case for all fuels. More specifically, net plant output and efficiency for natural gas are higher as compare to other fuels for all GT scenarios. For a given 70 MWe frame with and without fogger, break even fuel price and electricity price have been found to vary from 2.2 to 2.5 USD/MMBTU and from 0.020 to 0.0239 USD/kWh respectively. It has been noticed that turbines operating on natural gas emit less carbon relatively as compared to other fuels.

Sign in / Sign up

Export Citation Format

Share Document