Features of the Working Process in a Hybrid Combustion Chamber of an Ammonia-Fueled Gas Turbine Engine (original) (raw)
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Збірник наукових праць Національного університету кораблебудування, 2023
The need to reduce the impact of energetics on the environment determines the need to develop and adapt energy-efficient decarbonized systems, as well as determine the ranges of their rational parameters. The aim of the work is to study the energy and emission characteristics of gaseous ammonia burning in the combustion chamber of a gas turbine engine with over-expansion. The combustion chamber for the afterburning of waste gases of a hightemperature fuel cell as part of a gas turbine unit with over-expansion was chosen as the object of the investigation. For detailed forecasting of the characteristics of the combustion chamber operating on ammonia, an approach was used, according to which the burning device is considered as a set of different chemical reactors (perfectly stirred, plug-flow), simulating the main processes of chemical transformations in different sections of the flame tube of the combustion chamber. A reactor model of the combustion chamber operating on gaseous ammonia has been developed, in which the relevant reactors simulate the primary zone of the combustion chamber, the dilution zone and the processes of mixing of secondary air, which is supplied to the respective zones, with the main flow. The mathematical model is based on the equations of conservation of mass and energy for a chemically reacting system. As a kinetic scheme of gaseous fuel burning in the combustion chambers of gas turbine engines, the mechanism of high-temperature oxidation of ammonia is used, taking into consideration the chemical reactions of hydrogen combustion, which includes 71 reactions with 22 components. The influence of operational parameters of the combustion chamber on the distribution of temperature and concentrations of chemically reactive components in the volume of the burning device is considered. Calculations of the working process of the combustion chamber were carried out for a thermal power of 1.,0 MW, a pressure of 0.3 MPa and at variation of the excess air coefficient from 1.41 to 2.03. The possibility of stable operation of the combustion chamber on ammonia under the conditions of effective swirling of the primary air is shown. At the same time, the residence time of the reagents in the primary combustion zone should exceed 0.025 seconds, which is possible if there are powerful devices for stabilizing combustion. The results of the work can be used in the development of combustion chambers of gas turbine engines for decarbonized energy systems, as well as for afterburning products of solid oxide fuel cells operating as part of hybrid power plants.
NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, 2015
УДК 621.43.056 С. И. СЕРБИН, д-р техн. наук, проф.; директор Машиностроительного института НУК им. адм. Макарова, Николаев; Н. А. ГОНЧАРОВА, ассистент кафедры турбин НУК им. адм. Макарова, Николаев; В. В. ВИЛКУЛ, нач. сектора расчетных и экспериментальных работ отдела камер сгорания ГП НПКГ «Зоря»-«Машпроект», Николаев ИССЛЕДОВАНИЕ ОСОБЕННОСТЕЙ РАБОЧЕГО ПРОЦЕССА КАМЕРЫ СГОРАНИЯ ГТД МОЩНОСТЬЮ 2,5 МВТ, РАБОТАЮЩЕЙ НА СИНТЕЗ-ГАЗЕ Статья посвящена вопросам численного моделирования рабочих процессов камер сгорания газотурбинных двигателей, работающих на синтез-газе. Авторами исследованы вопросы возможности применения синтез-газов в качестве основного топлива для камер сгорания. Рассмотрены вопросы применения конструктивных модификаций топливосжигающих устройств с целью применения RQLтехнологии для улучшения экологических характеристик существующих камер сгорания газотурбинных двигателей. Ключевые слова: камера сгорания, синтез-газ, RQL-технология, математическое моделирование, горение.
Working Process of Internal Combustion Engine Running on Enriched Hydrogen Gasoline-Air Mixture
Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series, 2018
The effect of hydrogen additives on the working process of a piston-type gasoline engine is studied. The indicator diagram has been built, and the operation of the piston engine on gasoline-air mixtures enriched with hydrogen in the amount of 0…20 % of the volume of air entering the engine has been analyzed. The possibility of obtaining satisfactory parameters when the engine works on gasoline with hydrogen additives is shown. The dynamics of the engine performance is studied depending on the oxidant excess coefficient. It has been established that the oxidizer excess ratio at which the maximum indicator pressure is reached is moved to the zone of poor mixtures. When the mixture is enriched with hydrogen in the amount of 20 % of the air volume, the maximum of indicator pressure pimax = 5.3...5.8 MPa is reached at α = 1.15...1.25, while for 10 % hydrogen addition the maximum pimax = 4.9...5.2 MPa takes place at α = 1.05...1.10 against pimax = 4.7...5.1 MPa at α = 0.90...0.95 for pure...
Судостроение и морская инфраструктура, 2022
The issue of environmental aspects of power plants in the modern world is inseparably considered inseparable from increasing efficiency. Therefore, researchers propose new approaches to improve pollutant emissions. The article considers the possibility of combining methods of increasing efficiency and environmental aspects to use the potential of energy carriers in conjunction with minimizing environmental damage. The article is aimed at investigating the processes of combustion of hydrogen fuel in the combustion chamber of a contact-type turbine as part of a hybrid gassteam power plant and the influence of various variants of steam injection into the chamber on the emission indicators. The study was carried out by modelling using modern CFD complex such as Ansys Fluent. As a result, data on possible environmental indicators in the selected mode with different variants of steam injection are obtained, and the contours of temperature and concentrations of nitrogen oxides in different cross-sections of the flame tube are presented. The influence of the amount of injected ecological steam on nitrogen oxide emissions is reflected. The possibility of using of hybrid power plant for Floating Production, Storage, and Offloading (FPSO) vessels and gas carriers is considered.
Increasing the Stability of a Low-Emission Gas Turbine Combustion Chamber
Collection of Scientific Publications NUS, 2021
Purpose. The main aim of the research is to increase the stability of gaseous fuel combustion processes in a gas turbine engine (GTE) low-emission combustors due to the plasma-chemical influence on the processes of mixture formation and gas-dynamic improvement of the flow part. Method. The improvement of vibrating characteristics of GTE low-emission combustors with plasma-chemical stabilizer is provided by solution the main research problems in accordance with the generally accepted methodology of scientific research. The theoretical basis of the research is the scientific work of specialists in the study of hydrocarbon fuels combustion. Results. Increasing the stability of a low-emission GTE combustion chamber operating on gaseous fuel is ensured by the influence of low-temperature plasma generators on the fuel-air mixture formation processes. The mathematical model of unsteady processes in a GTE low-emission combustion chamber, that takes into consideration of the plasma chemical generator influence on the stability processes and allows to predict the pulsation characteristics of fuel-burning devices, is developed. Scientific novelty. The performed numerical experiment have shown that the aerodynamic improvement of the flow part and the use of the plasma generator reduces the pressure pulsations inside flame tube by 10…35%, while in the area of primary air supply the reduction of pulsations is most pronounced. Practical importance. Creation of a numerical experiment technique to increase the stability of gaseous fuel combustion processes in low-emission combustion chambers using modern computational hydrodynamics complexes will increase the efficiency of design and research work. Practical recommendations have been developed to improve the acoustic stability of processes in a low-emission combustion chamber with preliminary mixing of fuel with air for a 25 MW gas turbine engine using low-current plasma-chemical generators and air-dynamic improvement of the combustion device. The results and calculating methods the characteristics of the combustion chamber with plasma chemical stabilizer are used at gas turbine enterprises in the designing new and upgrading existing models of GTE low-emission combustion chambers.
NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, 2016
АННОТАЦИЯ Статья посвящена вопросу стабилизации пульсационных процессов в камерах сгорания газотурбинных двигателей за счёт газодинамического совершенствования проточной части. Проведён анализ пульсационных процессов в низкоэмиссионной камере сгорания газотурбинного двигателя с помощью современных инструментов вычислительной гидродинамики. Проведены теоретические исследования пульсационных характеристик низкоэмиссионной камеры сгорания с предварительным перемешиванием топливо-воздушной смеси Разработаны практические рекомендации по повышению устойчивости горения в низкоэмиссионной камере сгорания ГТД.
Bulletin of the National Technical University «KhPI» Series: Engineering and CAD
The article is devoted to the use of low-energy synthesized gas (synthesis gas) as a fuel for internal combustion engines, which in turn transmit mechanical energy to a cogeneration plant (combined production of heat and electricity). Such power plants allow you to achieve high values of total effective efficiency when using a conventional internal combustion engine with spark ignition. The analysed synthetic gases can be obtained by the method of gasification of household waste with access to air. In this work, synthesis gases were obtained in laboratory conditions. The composition of the components of the studied synthesis gases corresponds to several gas mixtures that are created during the artificial gasification of household waste of certain categories. The influence of the composition of the synthesis gas components on the internal parameters of the internal combustion engine was studied. The process of supplying fuel to the engine was controlled by a standard block with sever...
Theoretical Investigations of a Dual-Fuel Low-Emission Gas Turbine Combustor
NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, 2020
Запропоновано ефективний спосіб організації згоряння рідкого палива в двопаливній газотурбінній камері згоряння. Обрана математична модель подачі і горіння рідкого палива. Проведено тривимірні теоретичні дослідження впливу різних способів впорскування рідкого палива в канали аксіально-радіальних завихрювачів на нерівномірність температурного поля на виході з жарової труби, а також на утворення оксидів азоту і монооксиду вуглецю в низькоемісійній камері згоряння. Ключові слова: газотурбінний двигун; двопаливна низькоемісійна камера згоряння; процес горіння. Б. Т. ДИАСАМИДЗЕ, С. В. ВИЛКУЛ, С. И. СЕРБИН ТЕОРЕТИЧЕСКИЕ ИССЛЕДОВАНИЯ ДВУХТОПЛИВНОЙ НИЗКОЭМИССИОННОЙ КАМЕРЫ СГОРАНИЯ ГАЗОТУРБИННОГО ДВИГАТЕЛЯ Предложен эффективный способ организации сгорания жидкого топлива в двухтопливной газотурбинной камере сгорания. Выбрана математическая модель подачи и горения жидкого топлива. Проведены трехмерные теоретические исследования влияния различных способов впрыска жидкого топлива в каналы аксиально-радиальных завихрителей на неравномерность температурного поля на выходе из жаровой трубы, а также на образование оксидов азота и монооксида углерода в низкоэмиссионной камере сгорания. Ключевые слова: газотурбинный двигатель; двухтопливная низкоэмиссионная камера сгорания; процесс горения. B. DIASAMIDZE, S. VILKUL, S. SERBIN THEORETICAL INVESTIGATIONS OF A DUAL-FUEL LOW-EMISSION GAS TURBINE COMBUSTOR The use of dual-fuel gas turbine engines is one of the promising direction for improving the efficiency and reliability of power systems. The analysis of the possibility of creating a low-emission dual-fuel combustor for a gas turbine engine has been made. An effective method of organizing the working process in a dual-fuel gas turbine combustor is proposed. A low-emission gas turbine combustor with pre-mixing of fuel and air was selected as a research object. To increase the efficiency of processes in a dual-fuel gas turbine combustor, it is proposed to use the idea of preliminary mixing of liquid fuel with air in axial-radial swirlers. The choice of a mathematical model of liquid fuel burning in a dual-fuel low-emission combustor taking into consideration formation of the main toxic components has been made. Eddy dissipation concept and discrete phase models have been used for liquid fuel combustion process modeling. Theoretical investigations of nitrogen oxides formation have been carried out for various methods of liquid fuel injection into the channels of axial-radial swirlers of low-emission combustor. The results of three-dimensional mathematical modeling showed the prospect of a radial method of liquid fuel injection into the channels of axial-radial swirlers of a gas turbine low-emission combustor in comparison with the traditional method of liquid fuel supply using centrifugal nozzles. The results of mathematical modeling revealed that radial liquid fuel flow improves the thermal and emission combustor's performance. As result radial fuel supply method was taken as the most efficient and perspective. The calculated values of nitrogen oxides emission at the exit section of the flame tube for radial supply of liquid fuel are 36-46 ppm.
Features Combustion Process in Diesel Engines When Working at Water-Fuel Emulsion
Internal Combustion Engines, 2016
Проаналізовано фізико-хімічні властивості водопаливної емульсії та їх вплив на процеси сумішоутворення та згоряння палива. Наведено методику проведення та результати експериментальних досліджень дизеля 4ЧН12/14 на водопаливній емульсії. Проаналізовано основні гіпотези, що розкривають механізм впливу водопаливної емульсії на процеси сумішоутворення та згоряння: гіпотезу «мікровибухів» та гіпотезу каталітичного впливу продуктів дисоціації води на процес згоряння. За результатами досліджень зроблені висновки про ступінь впливу кожного з механізмів протягом окремих періодів згоряння.
Internal Combustion Engines and Environment
Dvigateli vnutrennego sgoraniâ, 2022
Парсаданов Ігор Володимирович-доктор техн. наук, проф., головний науковий співробітник кафедри двигунів та гібридних енергетичних установок Національного технічного університету «Харківський політехнічний інститут»,