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Numerical simulation of a complete gas turbine engine working with inlet cooling of water injection has been evaluated using computational fluid dynamic (CFD), the influence of water droplet and injection rate on the compressor operation, engine combustion and the turbine were studied. The results obtained in contrast with dry compression unveil that, with minimum amount of water droplet and high...
This paper proposes a generic methodology for combined cycle gas turbines (CCGT) modeling. The main objectives are the estimation of the CO2 emissions for specific units and their integration in an environmental power dispatch that considers several plants. At first a design procedure aims at calibrating the model using the sparse information advised by the manufactures. Off-design points are also...
The purpose of this paper is to carry out a comparative analysis between different sources of producing heat in a district heating system that can be used in a transition period from a technically obsolete source to a state-of-the-art source. What is being analyzed is the impact of the technology on the mode of operation and the degree of integration in the new source.
The aim of this article is that of proposing a novel approach for the control of an electric gas-generating unit for large power generation. The main objective of the control of a gas generating unit is that of controlling power production, in order to meet the requirements of grid operator, and keep the temperature of the exhaust gasses at the turbine outlet at a constant value in order to allow...
This paper analyzes and evaluates exergetic improvement rate (IPex) of the components of a small turbojet engine with various turbine inlet temperatures. The engine consists of an inlet, starter generator, a centrifugal compressor, a reverse flow combustion chamber, an axial-flow turbine and an exhaust nozzle. IPex analysis is performed on this turbomachinery utilizing kerosene as a fuel. Exergetic...
Gas turbine combustion system (GTCS) works in the highly adverse environmental conditions of high temperature and high pressure. Because GTCS initial temperature is too high to be directly measured, exhaust gas temperature (EGT) is an alternative to detect performance of GTCS. However, various interferences, such as working and ambient conditions as well as compressor and combustion efficiencies and...
Aircraft engine starting is usually defined as the operating range between zero and engine idle speed. A high-fidelity model of this process can be used not only for analysis and optimization of the start-up process, but also to reduce huge costs of rig test. In this paper a component level model of the process is developed using component characteristics extrapolation method to solve the key problem...
The paper considers a power engineering method that can be used at heat power plants burning organic fuel and equipped with gas turbine-generator sets. It provides a solution improving electric power output by supply of pressurized oxygen flows, fuel and vented exhaust to the oxidizing chamber, production of hot combustion products under pressure and their supply to the turbine working cavity, transfer...
A method of operating gas turbine generator by mixing air with the cooled recirculating combustion gases, compressing of fuel and air mixture at the cooled recirculating combustion gases, combustion chamber pressurized fuel in the medium obtained compression mixture with the cooled air recirculated products of combustion to form a high-temperature gaseous combustion products, gas turbine decompression...
Swirl injectors have been widely used in gas turbines to form the swirling flames, and thus increase the combustion efficiency. The temperature distribution of the swirling flame reflects the combustion efficiency to a large extent. In this paper, the tunable diode laser absorption spectroscopy (TDLAS)-based tomography system was developed to reconstruct the two-dimensional temperature distribution...
This paper presents a study about the modeling and simulation of Bazyan Gas Power Plant. The request of energy in the developing regions of the world has testify pronounced increase in the recent past. Thus, it is important to use power generations that have high efficiency and specific power output, low emissions of pollutants, and low operating and maintenance cost for a possible use of available...
Analysis of combustion quality of flame images of thermal and gas turbine power plants is of great importance. In the domain of image processing the detection, recognition and understanding is the foundation for identifying the combustion condition. Soft sensors are the state of the art. So the flame temperature based on subsequent combustion quality estimation is done using Back Propagation Algorithm...
This paper shows the results of studying the influence of a plasma-chemical stabilizer on the pulse parameters of a gas turbine low emissive combustor. It is found out that the increase of the processes stability in low emissive gas turbine combustors with preliminary formation of air-fuel mixture may be reached due to plasma-chemical influence of the plasma-assisted systems based on low-current discharges...
The intermittent nature of renewable energy sources is a key challenge to their integration into the electricity grid. The aim of this paper is to introduce an advanced concept of Power-to-Gas (PtG) plant, which is designed to bring a closed-loop solution able to absorb electricity surplus and to restore it later, via the transient storage of energy carriers. After a brief conceptual overview of the...
This paper deals with the modelling and flow simulation in the combustion chamber of a turbojet engine in order to find the optimal velocity, pressure and temperature distributions in the flame tube and in front of the turbine. The Arrhenius relationship, which describes the basic dependencies of the reaction rate on pressure, temperature and concentration has been used. Also, combustion efficiency...
In this article, a principal component analysis (PCA) based process monitoring approach is proposed for detecting and isolating damaged splitter nozzles in gas turbine combustion chamber. Damage in splitter nozzles can lead to unstable combustion process and had to start-up and result in unplanned shutdown. The present method detects any abnormal temperature behavior by monitoring the combined index...
As the number of combined-cycle units increases, efficient modeling approaches for these units play important roles for independent system operators (ISOs). Based on various combinations of combustion turbines (CTs) and steam turbines (STs), the combined-cycle unit could work at different configurations (modes) with different efficiencies. In this paper, we propose an edge-based formulation for the...
Unit Commitment and Economic Dispatch (UCED) with combined cycle (CC) units and AC power flow is an important problem to be solved by ISOs. The problem is difficult because of complicated transitions in CC units and highly non-linear AC power flows. Currently, to solve the problem, transitions among CC states are simplified and AC power flow is approximated with DC power flow. However, the resulting...
Detection and prediction of combustion instabilities are of interest to the gas turbine engine community with many practical applications. This paper presents a dynamic data-driven approach to accurately detect precursors to the combustion instability phenomena. In particular, grey-scale images of combustion flames have been used in combination with pressure time-series data for information fusion...
This work developed a continuous timed Petri Net model of a gas turbine, using a first linear order approximation for every state of the Brayton Cycle. The Brayton cycle rules the functioning of a gas turbine, and it is composed by four states: Compression, Combustion, Expansion and Cooling. In every state (excepting the cooling phase) temperature and pressure are modeled as first order linear systems,...
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