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Letteratura scientifica selezionata sul tema "CYCLE GAS TURBINE"

Autore: Grafiati
Pubblicato: 11 settembre 2023

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Articoli di riviste sul tema "CYCLE GAS TURBINE"

1

Kosowski, Krzysztof, e Marian Piwowarski. "Design Analysis of Micro Gas Turbines in Closed Cycles". Energies 13, n. 21 (5 novembre 2020): 5790. http://dx.doi.org/10.3390/en13215790.

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The problems faced by designers of micro-turbines are connected with a very small volume flow rate of working media which leads to small blade heights and a high rotor speed. In the case of gas turbines this limitation can be overcome by the application of a closed cycle with very low pressure at the compressor inlet (lower than atmospheric pressure). In this way we may apply a micro gas turbine unit of accepted efficiency to work in a similar range of temperatures and the same pressure ratios, but in the range of smaller pressure values and smaller mass flow rate. Thus, we can obtain a gas turbine of a very small output but of the efficiency typical of gas turbines with a much higher power. In this paper, the results of the thermodynamic calculations of the turbine cycles are discussed and the designed gas turbine flow parts are presented. Suggestions of the design solutions of micro gas turbines for different values of power output are proposed. This new approach to gas turbine arrangement makes it possible to build a gas turbine unit of a very small output and a high efficiency. The calculations of cycle and gas turbine design were performed for different cycle parameters and different working media (air, nitrogen, hydrogen, helium, xenon and carbon dioxide).
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2

Moukalled, F., e I. Lakkis. "Computer-Aided Analysis of Gas Turbine Cycles". International Journal of Mechanical Engineering Education 22, n. 3 (luglio 1994): 209–27. http://dx.doi.org/10.1177/030641909402200306.

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This paper describes a microcomputer-based, interactive, and menu-driven software package designed to help mechanical engineering students to understand gas turbines and to allow them to conduct more analysis of gas turbine cycles than they would normally be able to do by hand-calculation. The program deals with gas turbine cycle analysis so the acronym GTCA is used. GTCA is written in the Pascal computer language and runs on IBM PC, or compatible, computers. Improvements to the basic Brayton cycle, including three compressor and turbine stages, reheater, heat exchanger, intercooler, and precooler are incorporated into the program. The package is highly flexible and allows the user to model cycle schemes formed of any combination of these elements and to handle both shaft power turbines and aircraft turbojet and turbofan turbines. An important feature of the program is its ability to solve for any unknown variables. In addition to this, the program provides a schematic of the turbine plant layout and a temperature-entropy diagram of the cycle, and permits the plotting of the variation of any quantity versus any other quantity. This option enables the student to easily study and understand the effects of changing design variables on the overall performance of the cycle and permits its optimization. The statistical survey conducted along with the examples presented demonstrate the capabilities of the package as a teaching tool.
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Kosowski, Krzysztof, Karol Tucki, Marian Piwowarski, Robert Stępień, Olga Orynycz e Wojciech Włodarski. "Thermodynamic Cycle Concepts for High-Efficiency Power Plants. Part B: Prosumer and Distributed Power Industry". Sustainability 11, n. 9 (9 maggio 2019): 2647. http://dx.doi.org/10.3390/su11092647.

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An analysis was carried out for different thermodynamic cycles of power plants with air turbines. A new modification of a gas turbine cycle with the combustion chamber at the turbine outlet has been described in the paper. A special air by-pass system of the combustor was applied, and in this way, the efficiency of the turbine cycle was increased by a few points. The proposed cycle equipped with an effective heat exchanger could have an efficiency higher than a classical gas turbine cycle with a regenerator. Appropriate cycle and turbine calculations were performed for micro power plants with turbine output in the range of 10–50 kW. The best arrangements achieved very high values of overall cycle efficiency, 35%–39%. Such turbines could also work in cogeneration and trigeneration arrangements, using various fuels such as liquids, gaseous fuels, wastes, coal, or biogas. Innovative technology in connection with ecology and the failure-free operation of the power plant strongly suggests the application of such devices at relatively small generating units (e.g., “prosumers” such as home farms and individual enterprises), assuring their independence from the main energy providers. Such solutions are in agreement with the politics of sustainable development.
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Sanaye, Sepehr, e Salahadin Hosseini. "Off-design performance improvement of twin-shaft gas turbine by variable geometry turbine and compressor besides fuel control". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, n. 7 (3 dicembre 2019): 957–80. http://dx.doi.org/10.1177/0957650919887888.

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A novel procedure for finding the optimum values of design parameters of industrial twin-shaft gas turbines at various ambient temperatures is presented here. This paper focuses on being off design due to various ambient temperatures. The gas turbine modeling is performed by applying compressor and turbine characteristic maps and using thermodynamic matching method. The gas turbine power output is selected as an objective function in optimization procedure with genetic algorithm. Design parameters are compressor inlet guide vane angle, turbine exit temperature, and power turbine inlet nozzle guide vane angle. The novel constrains in optimization are compressor surge margin and turbine blade life cycle. A trained neural network is used for life cycle estimation of high pressure (gas generator) turbine blades. Results for optimum values for nozzle guide vane/inlet guide vane (23°/27°–27°/6°) in ambient temperature range of 25–45 ℃ provided higher net power output (3–4.3%) and more secured compressor surge margin in comparison with that for gas turbines control by turbine exit temperature. Gas turbines thermal efficiency also increased from 0.09 to 0.34% (while the gas generator turbine first rotor blade creep life cycle was kept almost constant about 40,000 h). Meanwhile, the averaged values for turbine exit temperature/turbine inlet temperature changed from 831.2/1475 to 823/1471°K, respectively, which shows about 1% decrease in turbine exit temperature and 0.3% decrease in turbine inlet temperature.
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Langston, Lee S. "Whisper and Roar". Mechanical Engineering 136, n. 07 (1 luglio 2014): 38–43. http://dx.doi.org/10.1115/1.2014-jul-2.

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This article focuses on the use of gas turbines for electrical power, mechanical drive, and marine applications. Marine gas turbines are used to generate electrical power for propulsion and shipboard use. Combined-cycle electric power plants, made possible by the gas turbine, continue to grow in size and unmatched thermal efficiency. These plants combine the use of the gas turbine Brayton cycle with that of the steam turbine Rankine cycle. As future combined cycle plants are introduced, we can expect higher efficiencies to be reached. Since almost all recent and new U.S. electrical power plants are powered by natural gas-burning, high-efficiency gas turbines, one has solid evidence of their contribution to the greenhouse gas reduction. If coal-fired thermal power plants, with a fuel-to-electricity efficiency of around 33%, are swapped out for combined-cycle power plants with efficiencies on the order of 60%, it will lead to a 70% reduction in carbon emissions per unit of electricity produced.
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Maunsbach, K., A. Isaksson, J. Yan, G. Svedberg e L. Eidensten. "Integration of Advanced Gas Turbines in Pulp and Paper Mills for Increased Power Generation". Journal of Engineering for Gas Turbines and Power 123, n. 4 (1 gennaio 2001): 734–40. http://dx.doi.org/10.1115/1.1359773.

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The pulp and paper industry handles large amounts of energy and today produces the steam needed for the process and some of the required electricity. Several studies have shown that black liquor gasification and combined cycles increase the power production significantly compared to the traditional processes used today. It is of interest to investigate the performance when advanced gas turbines are integrated with next-generation pulp and paper mills. The present study focused on comparing the combined cycle with the integration of advanced gas turbines such as steam injected gas turbine (STIG) and evaporative gas turbine (EvGT) in pulp and paper mills. Two categories of simulations have been performed: (1) comparison of gasification of both black liquor and biomass connected to either a combined cycle or steam injected gas turbine with a heat recovery steam generator; (2) externally fired gas turbine in combination with the traditional recovery boiler. The energy demand of the pulp and paper mills is satisfied in all cases and the possibility to deliver a power surplus for external use is verified. The study investigates new system combinations of applications for advanced gas turbines.
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Kosowski, Krzysztof, Karol Tucki, Marian Piwowarski, Robert Stępień, Olga Orynycz, Wojciech Włodarski e Anna Bączyk. "Thermodynamic Cycle Concepts for High-Efficiency Power Plans. Part A: Public Power Plants 60+". Sustainability 11, n. 2 (21 gennaio 2019): 554. http://dx.doi.org/10.3390/su11020554.

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An analysis was carried out for different thermodynamic cycles of power plants with air turbines. Variants with regeneration and different cogeneration systems were considered. In the paper, we propose a new modification of a gas turbine cycle with the combustion chamber at the turbine outlet. A special air by-pass system of the combustor was applied and, in this way, the efficiency of the turbine cycle was increased by a few points. The proposed cycle equipped with a regenerator can provide higher efficiency than a classical gas turbine cycle with a regenerator. The best arrangements of combined air–steam cycles achieved very high values for overall cycle efficiency—that is, higher than 60%. An increase in efficiency to such degree would decrease fuel consumption, contribute to the mitigation of carbon dioxide emissions, and strengthen the sustainability of the region served by the power plant. This increase in efficiency might also contribute to the economic resilience of the area.
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Bontempo, R., e M. Manna. "Efficiency optimisation of advanced gas turbine recuperative-cycles". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, n. 6 (1 ottobre 2019): 817–35. http://dx.doi.org/10.1177/0957650919875909.

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The paper presents a theoretical analysis of three advanced gas turbine recuperative-cycles, that is, the intercooled, the reheat and the intercooled and reheat cycles. The internal irreversibilities, which characterise the compression and expansion processes, are taken into account through the polytropic efficiencies of the compressors and turbines. As customary in simplified analytical approaches, the study is carried out for an uncooled closed-circuit gas turbine without pressure losses in the heat exchangers and using a calorically perfect gas as working fluid. Although the accurate performance prediction of a real-gas turbine is prevented by these simplifying assumptions, this analysis provides a fast and simple approach which can be used to theoretically explain the main features of the three advanced cycles and to compare them highlighting pros and contra. The effect of the heat recuperation is investigated comparing the thermal efficiency of a given cycle type with those of two reference cycles, namely, the non-recuperative version of the analysed cycle and the simple cycle. As a result, the ranges of the intermediate pressure ratios returning a benefit in the thermal efficiency in comparison with the two reference cycles have been obtained for the first time. Finally, for the sole intercooled and reheat recuperative-cycle, a novel analytical expression for the intermediate pressure ratios yielding the maximum thermal efficiency is also given.
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Stathopoulos, Panagiotis. "Comprehensive Thermodynamic Analysis of the Humphrey Cycle for Gas Turbines with Pressure Gain Combustion". Energies 11, n. 12 (18 dicembre 2018): 3521. http://dx.doi.org/10.3390/en11123521.

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Abstract (sommario):
Conventional gas turbines are approaching their efficiency limits and performance gains are becoming increasingly difficult to achieve. Pressure Gain Combustion (PGC) has emerged as a very promising technology in this respect, due to the higher thermal efficiency of the respective ideal gas turbine thermodynamic cycles. Up to date, only very simplified models of open cycle gas turbines with pressure gain combustion have been considered. However, the integration of a fundamentally different combustion technology will be inherently connected with additional losses. Entropy generation in the combustion process, combustor inlet pressure loss (a central issue for pressure gain combustors), and the impact of PGC on the secondary air system (especially blade cooling) are all very important parameters that have been neglected. The current work uses the Humphrey cycle in an attempt to address all these issues in order to provide gas turbine component designers with benchmark efficiency values for individual components of gas turbines with PGC. The analysis concludes with some recommendations for the best strategy to integrate turbine expanders with PGC combustors. This is done from a purely thermodynamic point of view, again with the goal to deliver design benchmark values for a more realistic interpretation of the cycle.
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Motamed, Mohammad Ali, e Lars O. Nord. "Assessment of Organic Rankine Cycle Part-Load Performance as Gas Turbine Bottoming Cycle with Variable Area Nozzle Turbine Technology". Energies 14, n. 23 (26 novembre 2021): 7916. http://dx.doi.org/10.3390/en14237916.

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Power cycles on offshore oil and gas installations are expected to operate more at varied load conditions, especially when rapid growth in renewable energies puts them in a load-following operation. Part-load efficiency enhancement is advantageous since heat to power cycles suffer poor efficiency at part loads. The overall purpose of this article is to improve part-load efficiency in offshore combined cycles. Here, the organic Rankine bottoming cycle with a control strategy based on variable geometry turbine technology is studied to boost part-load efficiency. The Variable Area Nozzle turbine is selected to control cycle mass flow rate and pressure ratio independently. The design and performance of the proposed working strategy are assessed by an in-house developed tool. With the suggested solution, the part-load organic Rankine cycle efficiency is kept close to design value outperforming the other control strategies with sliding pressure, partial admission turbine, and throttling valve control operation. The combined cycle efficiency showed a clear improvement compared to the other strategies, resulting in 2.5 kilotons of annual carbon dioxide emission reduction per gas turbine unit. Compactness, autonomous operation, and acceptable technology readiness level for variable area nozzle turbines facilitate their application in offshore oil and gas installations.
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Tesi sul tema "CYCLE GAS TURBINE"

1

Betelmal, Entesar Hassan. "Thermo-economic study of gas turbine-absorption cogeneration cycle". Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417545.

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Hou, Yu 1963 Carleton University Dissertation Engineering Aerospace. "Cycle analysis of intercooled and regenerative naval gas turbine". Ottawa.:, 1993.

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3

Parmar, J. "Turbine inlet temperature measurement for control and diagnosis in combined cycle gas turbine". Thesis, Cranfield University, 2002. http://dspace.lib.cranfield.ac.uk/handle/1826/11053.

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The author was responsible for the Guarantee verification, testing and eventually Acceptance of all of National Power's Combined Cycle Gas Turbines for its commercial operation. It was discovered during the early Acceptance Testing of these power stations that the Original Equipment Manufacturers (OEMs) used empirical and indirect ~-~; methods to derive the gas turbine inlet temperature. This had direct impact on the life of the gas turbine components and revenue earned in terms of increase in maintenance costs and loss in generating power. It became absolutely imperative that alternative methods should be quickly deployed on National Power's gas turbines to substantiate or otherwise the already used indirect methods of running the gas turbines. A completely novel method of using ceramic thermocouples probes and embedded ceramics onto blades to monitor elevated gas temperatures from the early trials on large coal fired boilers to specially made burner rigs and the Spey gas turbine are discussed. A patent for the ceramic temperature probe was filed and approved. Finally, a non-intrusive infra-red thermal pyrometry was installed on two of National Power's CCGT power stations. The report includes technical aspects on emissivity, radiation, risks, obstacles encountered, and the methodology used to install the pyrometry. Using the data collated from Deeside Power Station, where two pyrometers are currently installed, the results obtained from the engine simulation are validated. Once the model was validated and the data correlated with the actual data obtained, it can be concluded that the deployment of pyrometry can control the diagnostics and operational behaviour of the CCGT plant. The efficiency of the gas turbine was shown to increase by about 0:4% and the corresponding increase in power was 1.3%, which would make a substantial savings in the operating and maintenance costs to National Power. This was estimated to be in access of £25,OOO,OOOlannum.
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Kandamby, Naminda Harisinghe. "Mathematical modelling of gasifier fuelled gas turbine combustors". Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267305.

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Pradeepkumar, K. N. "Analysis of a 115MW, 3 shaft, helium Brayton cycle". Thesis, Cranfield University, 2002. http://dspace.lib.cranfield.ac.uk/handle/1826/9219.

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This research theme is originated from a development project that is going on in South Africa, for the design and construction of a closed cycle gas turbine plant using gas-cooled reactor as the heat source to generate 115 MW of electricity. South African Power utility company, Eskom, promotes this developmental work through its subsidiary called PBMR (Pebble Bed Modular Reactor). Some of the attractive features of this plant are the inherent and passive safety features, modular geometry, small evacuation area, small infrastructure requirements for the installation and running of the plant, small construction time, quick starting and stopping and also low operational cost. This exercise is looking at the operational aspects of a closed cycle gas turbine, the finding of which will have a direct input towards the successful development and commissioning of the plant. A thorough understanding of the fluid dynamics in this three-shaft system and its transient performance analysis were the two main objectives of this research work. A computer programme called GTSI, developed by a previous Cranfield University research student, has been used in this as a base programme for the performance analysis. Some modifications were done on this programme to improve its control abilities. The areas covered in the performance analysis are Start-up, Shutdown and Load ramping. A detailed literature survey has been conducted to learn from the helium Turbo machinery experiences, though it is very limited. A critical analysis on the design philosophy of the PBMR is also carried out as part of this research work. The performance analysis has shown the advantage, disadvantage and impact of various power modulation methods suggested for the PBMR. It has tracked the effect of the operations of the various valves included in the PBMR design. The start-up using a hot gas injection has been analysed in detail and a successful start region has been mapped. A start-up procedure is also written based on this. The analysis on the normal and emergency load rejection using various power modulation devices has been done and it stress the importance of more control facilities during full load rejection due to generator faults. A computational fluid dynamics (CFD) analysis, using commercial software, has been carried out on some geometry of the PBMR design to find out whether its flow characteristic will have any serious impact on the performance on the cycle during the load control of the plant. The analysis has demonstrated that there will not be much impact on the performance, during load control using pressure level changes, from this geometry. However, some locations in the geometry have been identified as areas where the flow is experiencing comparatively high pressure losses. Recommendations, which include modification in the physical design, were made to improve this. The CFD analysis has extended to a cascade to compare the flow behaviour of Air and Helium with an objective of using air, being inexpensive, to test the helium flow characteristic in a test rig to simulate the behavioural pattern of helium in the PBMR pressure vessel. The specification of a hypothetical test rig and the necessary scaling parameters has been derived from this exercise. This will be useful for designing test rigs during the developmental and operational stage of the PBMR project.
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Schutte, Jeffrey Scott. "Simultaneous multi-design point approach to gas turbine on-design cycle analysis for aircraft engines". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28169.

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Thesis (M. S.)--Aerospace Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Mavris, Dimitri; Committee Member: Gaeta, Richard; Committee Member: German, Brian; Committee Member: Jones, Scott; Committee Member: Schrage, Daniel; Committee Member: Tai, Jimmy.
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Janikovic, Jan. "Gas turbine transient performance modeling for engine flight path cycle analysis". Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/7894.

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The growth in competitiveness in airline industry has called for more advanced tool to estimate the operating costs. Engine maintenance costs are an important decisionmaking element during airline fleet selection judgment. Long term observation in aerospace led to the development of engine maintenance costs calculators based on empirical correlation. But the possibilities of empirical model application for future engines without prior operational data are limited. A physics-based tool to estimate the life of the engine components and predict the shop visit rate requires the variations of thermodynamic parameters over the flight path. High fidelity engine models are simulated using an engine performance program. A test program designated for design, off-design and transient performance simulation for simple turbojet layout gas turbine engine has been programmed and tested. The knowledge gained from program coding was used to generate more robust transient performance code implemented to Turbomatch. Two transient methods have been tested: The rapid transient performance method and the thermodynamic matching method. The tests showed greater robustness and stability of the second method, which has been finally adopted for the program. For industrial engine configuration and for future novel engine cycles the heat-exchanger dynamic response model was implemented and tested. Created tool was demonstrated on short-haul study of engine flight path analysis. Together with the aircraft model, the tool produced variations of parameters needed for the lifing algorithm.
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Sampath, Suresh. "Fault diagnostics for advanced cycle marine gas turbine using genetic algorithm". Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/10204.

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The major challenges faced by the gas turbine industry, for both the users and the manufacturers, is the reduction in life cycle costs , as well as the safe and efficient running of gas turbines. In view of the above, it would be advantageous to have a diagnostics system capable of reliably detecting component faults (even though limited to gas path components) in a quantitative marmer. V This thesis presents the development an integrated fault diagnostics model for identifying shifts in component performance and sensor faults using advanced concepts in genetic algorithm. The diagnostics model operates in three distinct stages. The rst stage uses response surfaces for computing objective functions to increase the exploration potential of the search space while easing the computational burden. The second stage uses the heuristics modification of genetics algorithm parameters through a master-slave type configuration. The third stage uses the elitist model concept in genetic algorithm to preserve the accuracy of the solution in the face of randomness. The above fault diagnostics model has been integrated with a nested neural network to form a hybrid diagnostics model. The nested neural network is employed as a pre- processor or lter to reduce the number of fault classes to be explored by the genetic algorithm based diagnostics model. The hybrid model improves the accuracy, reliability and consistency of the results obtained. In addition signicant improvements in the total run time have also been observed. The advanced cycle Intercooled Recuperated WR2l engine has been used as the test engine for implementing the diagnostics model.
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Santos, Ana Paula Pereira dos. "Thermodynamic analysis of gas turbine cycle using inlet air cooling methods". Instituto Tecnológico de Aeronáutica, 2012. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2024.

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This work focuses on a comparative analysis among three compressor inlet air cooling techniques using a thermodynamic approach to simulate the gas turbine cycle. Firstly, a Base Case is tested to determine the gas turbine performance without any cooling method. The effect of site altitude on the power output gas turbine even without any cooling technique is also simulated. After, the evaporative cooling, absorption and mechanical refrigeration chillers are studied under different ambient temperature and relative humidity. Results showed that the cooling potential of the evaporative system is dependent of its effectiveness, while the absorption chiller cooling load is determined by pre-established compressor inlet air temperature. For the mechanical chiller method, however, it is necessary also to consider the power demand required by the vapour refrigerant compression. It is important to observe that although the absorption chiller has been the more suitable cooling method, it is only a realizable solution if the exhaust gases heat are available and with adequate discharge temperature. Furthermore, the gas turbine analysis is carried out at two brazilian locations: Campos/RJ and Goiania/GO. The monthly power output gain offered by the evaporative cooling method is low due to its intrinsic limitation, the ambient wet-bulb temperature. Further, the mechanical chiller system provided a considerable improvement in power output monthly results. However, the best power output increment is reached when the absorption chiller system is employed. Besides, a preliminary economic analysis showed that evaporative cooling offered the lowest unit electric energy cost, but associated with the lesser incremental power generation potential. On the other hand, the chillers systems are more expensive, while provide larger values of incremental electric energy. Results also showed that the cooling techniques allow obtaining a considerable increase in power generation with a lower cost in comparison with the gas turbine plant without any cooling method.
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Ghasemi, Milad, Hassan Hammodi e Sigaroodi Homan Moosavi. "Parallel-Powered Hybrid Cycle with Superheating “Partially” by Gas Turbine Exhaust". Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-16395.

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It is of great importance to acquire methods that has a sustainable solution for treatment and disposal of municipal solid waste (MSW). The volumes are constantly increasing and improper waste management, like open dumping and landfilling, causes environmental impacts such as groundwater contamination and greenhouse gas emissions. The rationalization of developing a sustainable solution implies in an improved way of utilizing waste resources as an energy source with highest possible efficiency. MSW incineration is by far the best available way to dispose the waste. One drawback of conventional MSW incineration plants is that when the energy recovery occurs in the steam power cycle configuration, the reachable efficiency is limited due to steam parameters. The corrosive problem limits the temperature of the superheated steam from the boiler which lowers the efficiency of the system. A suitable and relatively cheap option for improving the efficiency of the steam power cycle is the implementation of a hybrid dual-fuel cycle. This paper aims to assess the integration of an MSW incineration with a high quality fuel conversion device, in this case natural gas (NG) combustion cycle, in a hybrid cycle. The aforementioned hybrid dual-fuel configuration combines a gas turbine topping cycle (TC) and a steam turbine bottoming cycle (BC). The TC utilizes the high quality fuel NG, while the BC uses the lower quality fuel, MSW, and reaches a total power output of 50 MW.  Using a high-quality fuel in cogeneration can prove to be beneficial for improving and enhancing the overall plant profitability and efficiency while eliminating the corrosion problems with conventional MSW firing. The need for few interconnections between the different subunits in a parallel-fueled system allows for a wider range of operation modes and leaves room for service modes of the subunit. The hybrid dual-fuel cycle will be assessed for optimal cycle configuration and evaluated to how it compares to the sum of two separate single-fuel plants with optimal cycle configurations. Investigation of such aspects is a very important issue in order to be able to fully promote an implementation of hybrid combined cycle. The work presented herein also concentrates on investigating scenarios that include a full-load and part-load analysis in both condensing and combined heat and power (CHP) mode of operation. Through simulations and evaluation of obtained data, the results strengthens the fact that the electrical efficiency of hybrid configurations increases at least with 2% in condensing mode and 1,5% in CHP mode, comparing it to the sum of two separate single-fuel units of similar scale. The simulations show increased electrical efficiencies when running the BC in part-load and the TC in full load, with a higher NG to MSW ratio. The results also indicated that it is possible to extract more power output from the cycle by operating in CHP mode, due to more energy being utilized from the input fuel.
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Più fonti

Libri sul tema "CYCLE GAS TURBINE"

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1951-, Kehlhofer Rolf, a cura di. Combined-cycle gas & steam turbine power plants. 3a ed. Tulsa, Okla: Penwell, 2008.

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1951-, Kehlhofer Rolf, e Kehlhofer Rolf 1951-, a cura di. Combined-cycle gas & steam turbine power plants. 2a ed. Tusla, Okla: PennWell, 1999.

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Kehlhofer, Rolf. Combined-cycle gas & steam turbine power plants. Lilburn, GA: Fairmont Press, 1991.

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4

Garrett Turbine Engine Company. Engineering Staff e United States. National Aeronautics and Space Administration, a cura di. Brayton cycle solarized advanced gas turbine: Final report. [Washington, DC: National Aeronautics and Space Administration, 1986.

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5

Shield, C. Current developments in gas turbine combined cycle plant. Bury St. Edmunds: Mechanical Engineering Publication, 1989.

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Combined power plants: Including combined cycle gas turbine (CCGT) plants. Oxford [England]: Pergamon Press, 1992.

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7

Gorla, Rama S. R. Probabilistic analysis of gas turbine field performance. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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8

Energy Institute (Great Britain). Technical Team. Guidance on the development and commissioning of new combined cycle gas turbine (CCGT) plant. London: Energy Institute, 2019.

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9

Turchi, Craig S. Gas turbine/solar parabolic trough hybrid designs: Preprint. Golden, CO]: National Renewable Energy Laboratory, 2011.

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Taghani, Nourberdi. Crack growth in gas turbine alloys due to high cycle fatigue. Portsmouth: Portsmouth Polytechnic, Dept. of Mechanical Engineering, 1989.

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Capitoli di libri sul tema "CYCLE GAS TURBINE"

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Gülen, S. Can. "Gas Turbine Combined Cycle". In Applied Second Law Analysis of Heat Engine Cycles, 219–35. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003247418-14.

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Liu, Kun, Daifen Chen, Serhiy Serbin e Volodymyr Patlaichuk. "Simple Cycle Gas Turbine Units". In Gas Turbines Structural Properties, Operation Principles and Design Features, 87–97. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0977-3_7.

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Zohuri, Bahman, e Patrick McDaniel. "Gas Turbine Working Principals". In Combined Cycle Driven Efficiency for Next Generation Nuclear Power Plants, 149–74. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70551-4_7.

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Zohuri, Bahman. "Gas Turbine Working Principles". In Combined Cycle Driven Efficiency for Next Generation Nuclear Power Plants, 147–71. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15560-9_7.

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Voloshchuk, Volodymyr. "Calculation of Gas Turbine Engine Cycle". In Thermal Engineering Studies with Excel, Mathcad and Internet, 161–79. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26674-9_13.

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Müller, S. H. R., B. Böhm e A. Dreizler. "High-Speed Laser Diagnostics for the Investigation of Cycle-to-Cycle Variations of IC Engine Processes". In Flow and Combustion in Advanced Gas Turbine Combustors, 463–77. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5320-4_16.

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Liu, Kun, Daifen Chen, Serhiy Serbin e Volodymyr Patlaichuk. "Thermal Calculation of the Simple Cycle Gas Turbine Unit". In Gas Turbines Structural Properties, Operation Principles and Design Features, 109–21. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0977-3_9.

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Li, Zhihui. "Research of Helium Thermal Power System Based on Lead-Cooled Fast Reactor". In Springer Proceedings in Physics, 919–29. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_78.

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AbstractThe Helium Brayton cycle with re-compression has the advantages of compact layout, simple structure, thermal high efficiency, good heat transfer characteristics and small friction characteristics, its application in the power conversion system of the lead-cooled fast reactor and the high temperature gas-cooled reactor helps the miniaturization of the whole system. In this paper, the mathematical model was established for Helium Brayton cycle with re-compression and the 100 MWt lead-cooled fast reactor power system was calculated. The effects of several key factors such as the turbine inlet temperature, the turbine outlet pressure, the high pressure compressor outlet pressure, the low pressure compressor outlet pressure and the recuperator outlet temperature were analyzed. The results show that the turbine outlet pressure, the turbine inlet temperature and the high/low pressure compressor outlet pressure have remarkable effects on thermal efficiency of the system. Thermal efficiency of the system increases first and then decreases with the turbine outlet pressure increasing as well as increases with turbine inlet temperature. The research results of this paper could provide important theoretical reference both for thermal cycle parameters for 100 MWt lead-cooled fast reactor and system design of power cycle based on the lead-cooled fast reactor.
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Elhaj, Mohammed A., Kassim K. Matrawy e Jamal S. Yassin. "Modeling and Performance Prediction of a Solar Powered Rankin Cycle/Gas Turbine Cycle". In Challenges of Power Engineering and Environment, 103–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_18.

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Branchini, Lisa. "Waste-to-Energy and Gas Turbine: Hybrid Combined Cycle Concept". In Waste-to-Energy, 57–70. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13608-0_5.

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Atti di convegni sul tema "CYCLE GAS TURBINE"

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Clarke, P. "Gas turbine maintenance". In IEE Colloquium on Development in Mid-Merit Open Cycle Turbine Plants. IEE, 1999. http://dx.doi.org/10.1049/ic:19990662.

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Maheshwari, Mayank, e Onkar Singh. "Energy and Exergy Analysis of the Kalina Cycle Based Combined Cycle Using Solar Heating". In ASME 2014 Gas Turbine India Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gtindia2014-8192.

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Abstract (sommario):
Gas and steam combined cycle has Brayton cycle and Rankine cycle as topping and bottoming cycles respectively. Gas based topping cycle has flue gases leaving at high temperature which are utilized in heat recovery steam generator for steam generation. The steam thus generated is used for running steam turbine in bottoming cycle. It is seen that the heat recovery steam generator although offers reasonable heat recovery from flue gases but the temperature variation profile of gas does not match with that of steam generation. The use of ammonia in place of steam as working fluid offers a good matching of temperature profile of flue gas and ammonia and thus has capability to offer effective utilization of waste heat. In present work thermodynamic analysis of Kalina cycle used in combined cycle has been carried out. It includes the performance evaluation in terms of ammonia mass concentration, turbine inlet temperature and cycle pressure ratio. The results show that on increasing the ammonia mass fraction the efficiency of the cycle decreases up to ammonia mass concentration of 0.7 but beyond that efficiency starts increasing. It also indicates that by installing the solar heating, there occurs a heat gain up to 5% as compared to without solar heating for any given operating parameters.
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Singhal, Chirag, Sameer Hasan e M. F. Baig. "Modified Brayton Cycle for Turbofans". In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2433.

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Abstract In the present study, a design point analysis of twin-spool turbofan engines is carried out, considering fuel injection of Aviation Turbine Fuel (ATF) in the initial stages of the compressor instead of combustor The two-phase compression brings about intercooling in the modified Brayton cycle, by injecting the atomized fuel directly in the initial stages of axial-flow compressor. The intercooling effect results in reduction of compressor work while reinforcing the enthalpy of combustion of fuel due to change of state of fuel from liquid to vapor state. This brings about an improvement in the thrust and thermal efficiency of the modified cycle. Effect of the intercooling is investigated for different performance parameters namely Fuel flow rate ṁf Total thrust Fs, Thermal efficiency ηth, Overall efficiency ηo and Modified cycle factor MCF over the varying compressor pressure ratio (CPR). Injecting the fuel in the 2nd stage of compression results in percentage increase of total thrust by 21.14%, MCF by 31.35%, ηo by 14.92% and decrease in Fuel flow rate ṁf by 7%. While injecting the fuel in the 5th stage of compression results in increased ηo by 17.54 %, MCF by 37.30%, total thrust by 5.68% and decrease in Fuel flow rate ṁf by 22% at a CPR = 30 and Turbine Inlet Temperature (TIT) = 1260K vis-à-vis conventional cycle. Injecting the fuel in latter stages of compressor brings about a decrease of total thrust as well as efficiency.
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Horlock, J. H. "The Evaporative Gas Turbine [EGT] Cycle". In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-408.

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Abstract (sommario):
Humidification of the flow through a gas turbine has been proposed in a variety of forms. The STIG plant involves the generation of steam by the gas turbine exhaust in a heat recovery steam generator [HRSG], and its injection into or downstream of the combustion chamber. This increases the mass flow through the turbine and the power output from the plant, with a small increase in efficiency. In the evaporative gas turbine [or EGT] cycle, water is injected in the compressor discharge in a regenerative gas turbine cycle [a so-called CBTX plant-compressor [C], burner [B], turbine [T], heat exchanger [X]]; the air is evaporatively cooled before it enters the heat exchanger. While the addition of water increases the turbine mass flow and power output, there is also apparent benefit in reducing the temperature drop in the exhaust stack. In one variation of the basic EGT cycle, water is also added downstream of the evaporative aftercooler, even continuously in the heat exchanger. There are several other variations on the basic cycle [e.g. the cascaded humidified advanced turbine (CHAT)]. The present paper analyses the performance of the EGT cycle. The basic thermodynamics are first discussed, and related to the cycle analysis of a dry regenerative gas turbine plant. Subsequently some detailed calculations of EGT cycles are presented. The main purpose of the work is to seek the optimum pressure ratio in the EGT cycle for given constraints [e.g. fixed maximum to minimum temperature]. It is argued that this optimum has a relatively low value.
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Tsuji, Tadashi. "Cycle Optimization and High Performance Analysis of Gas Engine-Gas Turbine Combined Cycles". In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68352.

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Abstract (sommario):
The reciprocating engine operates with a maximum pressure and temperature in its cylinders that is higher than that in conventional gas turbines. When a gas engine is integrated with a gas turbine instead of a turbocharger, it is an ETCS (Engine-Turbo Compound System). We have developed the concept of a compound system with ERGT (Engine Reheat Gas Turbine) and propose it as a system with potentially high thermal efficiency. A natural gas firing gas turbine combined cycle (CC) is selected as the standard system for a thermal power plant. A higher TIT (Turbine Inlet Temperature) of gas turbine usually enables higher power generation efficiency. Focusing on the effect of engine exhaust temperature, we found that the ETCS cycle with a ERGT has the potential to achieve higher thermal efficiency than that of a gas turbine combined cycle, with no change in TIT. An engine exhaust temperature of 1173K increases the system power generation efficiency from 46 to 50%LHV (TIT 1150°C) and 54 to 57%LHV (TIT 1350°C), respectively. The gas engine–gas turbine combined cycle has the potential to achieve a significant efficiency increase of +4.1%LHV (TIT 1150°C) and +2.8%LHV (TIT 1350°C), making it a promising system for future power plants. Efficiency is expected to be improved by +8.7% (TIT 1150°C) and +5.6% (TIT 1350°C), relatively.
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Nanadagopal, Pugalenthi, Animesh Pandey, Manjunath More e Pertik Kamboj. "Combined Cycle Powerplant Cost Sensitivity Analysis". In ASME 2021 Gas Turbine India Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gtindia2021-75844.

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Abstract In Gas turbine-based combined cycle power plant market, the customer conducts an economic evaluation of competitive products to decide their buying option. There are different methods to calculate the economics of a power plant like Levelized cost of electricity (LCOE), Net present value (NPV) and payback period. LCOE methodology is commonly used for lifecycle cost analyses for combine cycle power plant that covers cost details of the plant and plant performance over the complete lifetime of a power plant from construction to retiring. Typically, it includes a combine cycle power plant ownership costs (Total plant cost and operating & maintenance cost) and combine cycle power output and efficiency. This LCOE method is helpful to compare power generation system that use similar technologies. This paper encompasses the LCOE calculation method, assumptions & approach to analyze the impact of key parameters of the electrical generation cost. They key parameters includes combine cycle output, combine cycle efficiency, fuel cost, annual operating hours, capital charge factor, annual operating hours, power plant life, discount rate, nominal escalation rate, operating & maintenance cost. This paper analyses result will provide insights to the customer & Gas turbine-based OEM (Own Equipment Manufacturing) companies to focus on different area/parameters to reduce the unit cost of generating electricity.
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Anderson, B. A., e P. J. Trenkamp. "Interactive Cycle Analysis". In ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-211.

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Abstract (sommario):
A new Interactive Cycle System has been developed by General Electric’s Aircraft Engine Business Group for the cycle analysis and performance optimization of conceptual and preliminary engine designs. This paper will explore some of the considerations in moving from a large, well-known, batch, detailed design, modeling system to a low-cost, flexible, responsive, user-friendly, interactive cycle analysis system. The resulting system utilizes menu screens for user input and data review, a modular program structure with stacking of modules to achieve the desired engine configuration, a library of component characteristics augmented by parametric component map generators, and an interpretive reader to permit real-time logic creation without the need for compiling.
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Sathish, Sharath, Pramod Kumar, Logesh Nagarathinam, Lokesh Swami, Adi Narayana Namburi, Venkata Subbarao Bandarupalli e Pramod Chandra Gopi. "Brayton Cycle Supercritical CO2 Power Block for Industrial Waste Heat Recovery". In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2347.

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Abstract (sommario):
Abstract The Brayton cycle based supercritical CO2 (sCO2) power plant is an emerging technology with benefits such as; higher cycle efficiency, smaller component sizes, reduced plant footprint, lower water usage, etc. There exists a high potential for its applicability in waste heat recovery cycles, either as bottoming cycles for gas turbines in a combined cycle or for industrial waste heat recovery in process industries such as iron & steel, cement, paper, glass, textile, fertilizer and food manufacturing. Conventionally steam Rankine cycle is employed for the gas turbine and industrial waste heat recovery applications. The waste heat recovery from a coke oven plant in an iron & steel industry is considered in this paper due to the high temperature of the waste heat and the technological expertise that exists in the author’s company, which has supplied over 50 steam turbines/ power blocks across India for various steel plants. An effective comparison between steam Rankine cycle and sCO2 Brayton cycle is attempted with the vast experience of steam power block technology and extending the high pressure-high temperature steam turbine design practices to the sCO2 turbine while also introducing the design of sCO2 compressor. The paper begins with an analysis of sCO2 cycles, their configurations for waste heat recovery and its comparison to a working steam cycle producing 15 MW net power in a coke oven plant. The sCO2 turbomachinery design follows from the boundary conditions imposed by the cycle and iterated with the cycle analysis for design point convergence. The design of waste heat recovery heat exchanger and other heat exchangers of the sCO2 cycle are not in the scope of this analysis. The design emphasis is on the sCO2 compressor and turbine that make up the power block. This paper highlights the design of a sCO2 compressor and turbine beginning from the specific speed-specific diameter (Ns-Ds) charts, followed by the meanline design. Subsequently, a detailed performance map is generated. The relevance of this paper is underscored by the first of a kind design and comparative analysis of a Brayton sCO2 power block with a working Steam Power block for the waste heat recovery in the energy intensive iron and steel industry.
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Ezzuldeen, Mustafa M. "Innovative Gas Turbine Engine Cycle Aerothermodynamical Analysis". In ASME 2013 Gas Turbine India Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gtindia2013-3522.

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Abstract (sommario):
The gas turbine engine design is fundamentally, taking the air flow into the compressing stage then combustion stage to add energy, and finally extracting energy in the turbine module. This journey of the flow in the engine is in serial connections. Posing the problem of the limiting turbine inlet temperature, the number that all the turbomachinery engineers desperately want to increase by tuning the inlet stages materials, or fine changes onto the blades’ profile or the flow paths. But the significant increase to this temperature lies under more fundamental and radical redesigns to the theory of the gas turbine operation, and its thermodynamical cycle. These principles were considered for long untouchable facts, and stayed lurking from the engineers examining eyes. This paper introduces one of these possibilities by genuine redesign concepts. Backed with CFD analysis, and Thermodynamical feasibility studies to address the potential problems of these modifications. The redesigns include implementing the new concept of the contra-rotating turbine more effectively to reduce the turbine module size, connecting pressurized fluid streams of two counter-rotating compressors in parallel instead of the serial connection, forming a protecting Pressurized shield for the entry turbine stages and, Extracting the energy in the process flow using flows interactions instead of flow-blades interactions.
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Kalina, A. L., e H. M. Leibowitz. "Applying Kalina Technology to a Bottoming Cycle for Utility Combined Cycles". In ASME 1987 International Gas Turbine Conference and Exhibition. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-gt-35.

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A new power generation technology often referred to as the Kalina cycle, is being developed as a direct replacement for the Rankine steam cycle. It may be applied to any thermal heat source, low or high temperature. Among several Kalina cycle variations there is one that is particularly well suited as a bottoming cycle for utility combined cycle applications. It is the subject of this paper. Using an ammonia/water mixture as the working fluid and a condensing system based on absorption refrigeration principles the Kalina bottoming cycle outperforms a triple pressure steam cycle by 16 percent. Additionally, this version of the Kalina cycle is characterized by an intercooling feature between turbine stages, diametrically opposite to normal reheating practice in steam plants. Energy and mass balances are presented for a 200 MWe Kalina bottoming cycle. Kalina cycle performance is compared to a triple pressure steam plant. At a peak cycle temperature of 950° F the Kalina plant produces 223.5 MW vs. 192.6 MW for the triple pressure steam plant, an improvement of 16.0 percent. Reducing the economizer pinch point to 15° F results in a performance improvement in excess of 30 percent.
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Rapporti di organizzazioni sul tema "CYCLE GAS TURBINE"

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Gulen, Seyfettin Can. Turbocompound Reheat Gas Turbine Combined Cycle. Office of Scientific and Technical Information (OSTI), aprile 2020. http://dx.doi.org/10.2172/1615157.

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Hoopes, Kevin. Advanced Gas Turbine and sCO2 Combined Cycle Power System. Office of Scientific and Technical Information (OSTI), gennaio 2020. http://dx.doi.org/10.2172/1607403.

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Detor, Andrew, Richard DiDomizio, Don McAllister, Erica Sampson, Rongpei Shi e Ning Zhou. A New Superalloy Enabling Heavy Duty Gas Turbine Wheels for Improved Combined Cycle Efficiency. Office of Scientific and Technical Information (OSTI), gennaio 2017. http://dx.doi.org/10.2172/1337871.

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Sterzinger, G. J. Integrated gasification combined cycle and steam injection gas turbine powered by biomass joint-venture evaluation. Office of Scientific and Technical Information (OSTI), maggio 1994. http://dx.doi.org/10.2172/10145278.

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Topper, Jr, W., e B. Thompson. The Enhancement of Brayton Cycle Efficiencies for Automotive Gas Turbine Engines Using Stationary Recuperating Heat Exchangers. Office of Scientific and Technical Information (OSTI), dicembre 1996. http://dx.doi.org/10.2172/766929.

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Subramanian, Ramesh. Additive Manufactured Metallic 3D Ox-Ox CMC Integrated Structures for 65% Combined Cycle Efficient Gas Turbine Components. Office of Scientific and Technical Information (OSTI), aprile 2020. http://dx.doi.org/10.2172/1608692.

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Solomon, P. R., Yuxin Zhao e D. S. Pines. Feasibility study for an advanced coal fired heat exchanger/gas turbine topping cycle for a high efficiency power plant. Office of Scientific and Technical Information (OSTI), febbraio 1993. http://dx.doi.org/10.2172/7089854.

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Author, Not Given. Energy Economic Data Base (EEDB) Program: Phase 9 Update (1987) report, AGCC5-A supplement: Advanced gas turbine combined cycle (natural gas based) power generating station. Office of Scientific and Technical Information (OSTI), maggio 1989. http://dx.doi.org/10.2172/6016033.

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Elliott, William. FRONT-END ENGINEERING DESIGN (FEED) STUDY FOR A CARBON CAPTURE PLANT RETROFIT TO A NATURAL GAS-FIRED GAS TURBINE COMBINED CYCLE POWER PLANT APPENDIX VOLUME 2. Office of Scientific and Technical Information (OSTI), dicembre 2021. http://dx.doi.org/10.2172/1836563.

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Solomon, P. R., Y. Zhao, D. Pines, R. C. Buggeln e S. J. Shamroth. Feasibility study for an advanced coal fired heat exchanger/gas turbine topping cycle for a high efficiency power plant. Final report. Office of Scientific and Technical Information (OSTI), novembre 1993. http://dx.doi.org/10.2172/10135308.

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