scholarly journals Optimization of the triple-pressure combined cycle power plant

2012 ◽  
Vol 16 (3) ◽  
pp. 901-914 ◽  
Author(s):  
Muammer Alus ◽  
Milan Petrovic
Keyword(s):  
Power Plant ◽  
Heat Recovery ◽  
Power Plants ◽  
Optimization Procedure ◽  
Steam Pressure ◽  
Combined Cycle ◽  
Production Costs ◽  
Operating Parameters ◽  
Pinch Point ◽  
Typical Design

The aim of this work was to develop a new system for optimization of parameters for combined cycle power plants (CCGTs) with triple-pressure heat recovery steam generator (HRSG). Thermodynamic and thermoeconomic optimizations were carried out. The objective of the thermodynamic optimization is to enhance the efficiency of the CCGTs and to maximize the power production in the steam cycle (steam turbine gross power). Improvement of the efficiency of the CCGT plants is achieved through optimization of the operating parameters: temperature difference between the gas and steam (pinch point P.P.) and the steam pressure in the HRSG. The objective of the thermoeconomic optimization is to minimize the production costs per unit of the generated electricity. Defining the optimal P.P. was the first step in the optimization procedure. Then, through the developed optimization process, other optimal operating parameters (steam pressure and condenser pressure) were identified. The developed system was demonstrated for the case of a 282 MW CCGT power plant with a typical design for commercial combined cycle power plants. The optimized combined cycle was compared with the regular CCGT plant.

A Genetic Algorithm for Optimizing Heat Recovery Steam Generators of Combined Cycle Power Plants

2011 ◽  
Author(s):  
Roberto Carapellucci ◽  
Lorena Giordano
Keyword(s):  
Genetic Algorithm ◽  
Power Plant ◽  
Steam Generator ◽  
Heat Recovery ◽  
Power Plants ◽  
Combined Cycle ◽  
Operating Parameters ◽  
Heat Recovery Steam Generator ◽  
Price Variation ◽  
Standard Design

Improving performance of combined cycle power plants has been the target of numerous investigations. Most of the researchers have focused their attention on the heat recovery steam generator (HRSG), the connecting equipment between the gas turbine group and the steam section. On the other hand, almost all equipment in a combined cycle is a fairly standard design available from a manufacturer, while the HRSG is one of the few components that may be somewhat customized. In fact, the HRSG provides many different design options with respect to the layout of heat transfer sections and their operating parameters. The aim of this work is the development of a model for optimizing the main operating parameters of the heat recovery steam generator of a CCGT. The thermodynamic behaviour of the power plant has been simulated through the commercial software GateCycle, whereas the optimization has been carried out using a genetic algorithm. The objective function to be minimized is the cost of electricity, evaluated through a cash flow analysis in constant or in current dollars. Two CCGT power plant configurations, with one or three-pressure reheat HRSG, are simulated and optimized, evaluating the influence of fuel price variation on the optimal operating parameters of HRSG.

Graph Theoretic Analysis of Advance Combined Cycle Power Plants Alternatives With Latest Gas Turbines

2013 ◽  
Author(s):  
Nikhil Dev ◽  
Gopal Krishan Goyal ◽  
Rajesh Attri ◽  
Naresh Kumar
Keyword(s):  
Power Plant ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Power Plants ◽  
Real Life ◽  
Combined Cycle ◽  
Turbine Engines ◽  
Steam Generation ◽  
Graph Theoretic ◽  
Early Decision

In the present work, graph theory and matrix method is used to analyze some of the heat recovery possibilities with the newly available gas turbine engines. The schemes range from dual pressure heat recovery steam generation systems, to triple pressure systems with reheat in supercritical steam conditions. From the developed methodology, result comes out in the form of a number called as index. A real life operating Combined Cycle Power Plant (CCPP) is a very large and complex system. Efficiency of its components and sub-systems are closely intertwined and insuperable without taking the effect of others. For the development of methodology, CCPP is divided into six sub-systems in such a way that no sub-system is independent. Digraph for the interdependencies of sub-system is organized and converted into matrix form for easy computer processing. The results obtained with present methodology are in line with the results available in literature. The methodology is developed with a view that power plant managers can take early decision for selection, improvements and comparison, amongst the various options available, without having in-depth knowledge of thermodynamics analysis.

Waste Heat Recovery and Saving Fresh Water Consumption in Power Plants

2012 ◽  
Author(s):  
Kwangkook Jeong
Keyword(s):  
Power Plant ◽  
Fresh Water ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Power Plants ◽  
Waste Heat ◽  
Combined Cycle ◽  
Water Recovery ◽  
Cooling Effects ◽  
Power Plant Cooling

A section to delineate ‘waste heat recovery’ has been written to contribute for the ASME Power Plant Cooling Specification/Decision-making Guide to be published in 2013. This paper informs tentative contents for the section on how to beneficially apply waste heat and water recovery technology into power plants. This paper describes waste heat recovery in power plant, current/innovative technologies, specifications, case study, combined cycle, thermal benefits, effects on system efficiency, economic and exergetic benefits. It also outlines water recovery technologies, benefits in fresh water consumptions, reducing acids emission, additional cooling effects, economic analysis and critical considerations.

Thermoeconomic Optimization of Heat Recovery Steam Generators

2007 ◽  
Author(s):  
Sepehr Sanaye ◽  
Omid Hamidkhani ◽  
Mostafa Shabanian ◽  
Rohollah Espanani ◽  
Abdolreza Hoshyar
Keyword(s):  
Power Plant ◽  
Objective Function ◽  
Heat Recovery ◽  
Combined Cycle ◽  
Design Parameters ◽  
Algorithm Optimization ◽  
Pinch Point ◽  
Total Cost ◽  
Combined Cycle Power Plant ◽  
Efficient Power

The combined cycle power plant (CCPP) is one of the efficient power producing technologies which includes both Brayton (topping) and Rankine (bottoming) cycles. The optimal design of heat recovery steam generator (HRSG) as an important part of a CCPP is a subject of interest. In this paper a thermoeconomic analysis has been applied to optimally design HRSGs in a combined cycle power plant. Two arrangements of heating elements are studied here. The method consists of both developing a simulation program and applying the Genetic Algorithm optimization scheme. The total cost per unit produced steam exergy was introduced as the objective function which included, capital or investment cost, operational cost, and the corresponding cost of the exergy destruction. The objective function per unit of produced steam exergy was minimized while satisfying a group of constraints. The decision variables (or design parameters as well as pinch point temperatures, pressure levels and, mass flow rates) are obtained. The variations of design parameters as well as the exergy efficiency and the total cost with the inlet hot gas enthalpy are shown.

An Impact of Environmental Disturbances on Combined Cycle Power Plant Control

2004 ◽  
Author(s):  
Zygfryd Domachowski ◽  
Marek Dzida
Keyword(s):  
Power Plant ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Power Plants ◽  
Ambient Pressure ◽  
Combined Cycle ◽  
Steam Generators ◽  
Environmental Disturbances ◽  
Power Plant Control ◽  
Plant Control

Combined cycle power plants operate at thermal efficiency approaching 60 percent. In the same time their performance presents several problems that have to be addressed. E.g. gas turbines are very sensitive to backpressure exerted on them by the heat recovery steam generators as well as to ambient pressure and temperature.

Inlet Conditioning Enhances Performance of Modern Combined Cycle Plants for Cost-Effective Power Generation

1996 ◽  
Author(s):  
Septimus Van Der Linden ◽  
David E. Searles
Keyword(s):  
Gas Turbines ◽  
Heat Recovery ◽  
Power Plants ◽  
High Efficiency ◽  
Performance Standards ◽  
Combined Cycle ◽  
Production Costs ◽  
Electricity Production ◽  
Cost Benefits ◽  
New Generation

This paper will examine the performance enhancement and cost benefits of inlet air conditioning applied to a modern combined cycle plant at high ambients, resulting in lower electricity production costs. Site specific cases are presented to demonstrate a broad range of application and cost benefits. The successful project in today’s aggressive competitive power marketplace is most typically defined as “lowest $/kW”. Traditional combined cycle plants have been driven to higher levels of efficiency by increasing gas turbine heat recovery using large, multiple pressure level heat recovery steam generators and improving heat sink technologies with aggressive cooling towers or air cooled condensers. This methodology rapidly produced less competitive results as the price of new generation was reduced. The driving technology behind this change was the development of high output, high efficiency advanced gas turbines. Improved metallurgy, cooling schemes and blade coating systems permitted each GT manufacturer to offer improved output and efficiencies. These improvements, coupled with industry uncertainty due to the threat of deregulation and consequential reduction in new generation opportunities, has allowed new performance standards to be realized for equal or lower unit prices, leading to an unparalleled reduction of installed cost for new power plants.

scholarly journals New Steel Alloys for the Design of Heat Recovery Steam Generator Components of Combined Cycle Gas Plants

2009 ◽  
Author(s):  
Jorge Pinto Fernandes ◽  
Eduardo Manuel Dias Lopes ◽  
Vicente Maneta
Keyword(s):  
Finite Element ◽  
Steam Generator ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Power Plants ◽  
Steam Pressure ◽  
Combined Cycle ◽  
Heat Recovery Steam Generator ◽  
Martensitic Steels ◽  
Element Analysis

Demand of Power is growing everyday, mainly due to emerging economies in CRIB countries (China, Russia, India and Brazil). During the last fifty years steam pressure and temperature in power plants have been continuously raised to improve thermal efficiency. Recent efforts to improve efficiency leads to the development of a new generation of Heat Recovery Steam Generator (HRSG) where the Benson Once-Through Technology is applied to improve thermal efficiency. The main purpose of this paper is to analyse the mechanical behaviour of a High Pressure Superheater Manifold by applying Finite Element Modelling (FEM) and a Finite Element Analysis with the objective to analyse stress propagation leading to the study of damage mechanism e.g. Uniaxial Fatigue, Uniaxial Creep for life prediction. The objective of this paper is also to analyse the mechanical properties of the new high temperature resistant materials in the market such as 2Cr Bainitic steels (T/P23, T/P24) and also the 9–12Cr Martensitic steels (T/P91, T/P92, E911 and P/T122). For this study the design rules for construction of power boilers to define the geometry of the HPSH Manifold were applied.

scholarly journals New Steel Alloys for the Design of Heat Recovery Steam Generator Components of Combined Cycle Gas Plants

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Jorge Pinto Fernandes ◽  
Eduardo Manuel Dias Lopes ◽  
Vicente Maneta
Keyword(s):  
Finite Element ◽  
Steam Generator ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Power Plants ◽  
Steam Pressure ◽  
Combined Cycle ◽  
Heat Recovery Steam Generator ◽  
Martensitic Steels ◽  
Element Analysis

Demand for power is growing everyday, mainly due to emerging economies in countries such as China, Russia, India, and Brazil. During the last 50 years steam pressure and temperature in power plants have been continuously raised to improve thermal efficiency. Recent efforts to improve efficiency leads to the development of a new generation of heat recovery steam generator, where the Benson once-through technology is applied to improve the thermal efficiency. The main purpose of this paper is to analyze the mechanical behavior of a high pressure superheater manifold by applying finite element modeling and a finite element analysis with the objective of analyzing stress propagation, leading to the study of damage mechanism, e.g., uniaxial fatigue, uniaxial creep for life prediction. The objective of this paper is also to analyze the mechanical properties of the new high temperature resistant materials in the market such as 2Cr Bainitic steels (T/P23 and T/P24) and also the 9–12Cr Martensitic steels (T/P91, T/P92, E911, and P/T122). For this study the design rules for construction of power boilers to define the geometry of the HPSH manifold were applied.

Effect of supplementary firing on the performance of an integrated gasification combined cycle power plant

2000 ◽  
Vol 214 (1) ◽  
pp. 53-60 ◽  
Author(s):  
S De ◽  
P K Nag
Keyword(s):  
Power Plant ◽  
Heat Recovery ◽  
Combined Cycle ◽  
Exergy Loss ◽  
Temperature Ratio ◽  
Integrated Gasification Combined Cycle ◽  
Specific Heats ◽  
Second Law Analysis ◽  
Integrated Gasification ◽  
Igcc Power Plant

The effect of supplementary firing on the performance of an integrated gasification combined cycle (IGCC) power plant is studied. The results are presented with respect to a simple ‘unfired’ IGCC power plant with single pressure power generation for both the gas and the steam cycles as reference. The gases are assumed as real with variable specific heats. It is found that the most favourable benefit of supplementary firing can be obtained for a low temperature ratio R T only. For higher R T, only a gain in work output is possible with a reverse effect on the overall efficiency of the plant. The second law analysis reveals that the exergy loss in the heat-recovery steam generator is most significant as the amount of supplementary firing increases. It is also noteworthy that, although the total exergy loss of the plant decreases with higher supplementary firing for a low R T (= 3.0), the reverse is the case for a higher R T (= 6.0).

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