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The Design Approach for Supercritical CO2 Gas Turbine Andrey Rogalev1, a), Evgeny Grigoriev1, 2, b), Sergey Osipov1, c) and Nikolay Rogalev1, d) 1National Research University “Moscow Power Engineering Institute”, 14 Krasnokazarmennaya Street, 111250, Moscow, Russia. 2Ivanovo State Power University named after V.I. Lenin, 34 Rabfakovskaya Street, Ivanovo, 153003, Ivanovo, Russia a)Corresponding author: r-andrey2007@yandex.ru b)evgeny@tren.ispu.ru c)osipovsk@mail.ru d)rogalevnd@mpei.ru Abstract. Nowadays the engineers are paying a great interest in the development of power plants for electricity production with zero greenhouse gas emissions. Oxy-fuel combustion cycle is a promising technology requiring detailed turbomachine development. This study presents the results of preliminary flow path design of a supercritical carbon dioxide gas turbine. Initial working fluid parameters for the developed 350 MW turbine are 1150 °C and 300 bar. The turbine pressure ratio is equal to 10. The turbine flow path with a constant root diameter was chosen. Blade length of the first stage is 31 mm with a mean diameter of 969 mm. Blade length of the last stage is 169 mm with a mean diameter of 1040 mm. The convective blade cooling system was proposed. With an average cooling efficiency factor of 0.4, the coolant flow consumption is no more than 10% of the total flow of carbon dioxide to the turbine. The presence of heat transfer intensifiers in the blade internal channels determines the cooling depth up to 150 °C, which allows the use of well-mastered heat-resistant alloys in gas turbine construction. INTRODUCTION The currently solved problem of carbon oxides emission in the power production industry emphasizes the development of closed thermodynamic cycles with oxy-fuel combustion [1, 2]. The best known research papers are [3–8]. The oxy-fuel combustion cycles comparison shows that one of the prospective technologies is the Allam cycle that operates the carbon dioxide CO2 with supercritical parameters [9]. Optimization studies on the Allam cycle working fluid parameters give the maximal design efficiency of 56.5% at initial parameters of 300 bar, 1083 °C and final pressure of 30 bar. New cycles with non-traditional working fluids require new types of the main and auxiliary power production equipment. The concerned technical problems are related to the choice of equipment type and manufacturing materials and development of new methods for design, manufacturing, mounting and operation. Development of the new Allam cycle turbine is of a special importance. The first experience in this turbine design and manufacturing belongs to the 50 MW Toshiba. Some of the key features of the turbine buildup are disclosed in [10]. If its operation will be successful the plan is to develop an over 300 MW turbine. It is worth mentioning that the design technology for high power turbines differs from the small turbine ones. Large fluid massflow requires large flow capacity flowpath, which obviously increases the turbine envelope dimensions. Here should be solved the combined problems of high reliability and high financial efficiency. The world practice yet has no experience in serial large (>300 MW) turbines with 30 MPa, 1083 °C. In the paper, authors propose to develop new Allam cycle turbines by integration of steam and gas turbine experience. 18th Conference of Power System Engineering, Thermodynamics and Fluid Mechanics AIP Conf. Proc. 2189, 020018-1–020018-7; https://doi.org/10.1063/1.5138630 Published by AIP Publishing. 978-0-7354-1936-0/$30.00 020018-1PDF Image | design approach for supercritical CO2 gas turbine
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