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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analiza pracy bloku nadkrytycznego 900 Mwe współpracującego z obiegiem ORC
    Thermodynamic analysis of the supercritical 900MWe power unit, co-operating with an ORC cycle
    Autorzy:
    Ziółkowski, P.
    Mikielewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/172841.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blok nadkrytyczny
    obieg ORC
    model numeryczny
    supercritical power unit
    ORC cycle
    numerical model
    Opis:
    W pracy przedstawiono analizę termodynamiczną bloku nadkrytycznego o mocy 900 MWe współpracującego z obiegiem ORC (organic Rankine cycle). Wykonano symulacje numeryczne pracy siłowni dla warunków nominalnych określając jej moc i sprawność elektryczną. Ponadto przeanalizowano pracę bloku współpracującego z obiegiem ORC dla czterech czynników roboczych, tj.: propan, izobutan, pentan i etanol. W układzie ORC górne źródła ciepła stanowi woda z systemu odzysku ciepła o temperaturze 90 °C wspomagana ciepłem z upustu pary z turbiny parowej. Analizę wykonano za pomocą kodów numerycznych typu CFM.
    The paper presents thermodynamic analysis of the supercritical 900 MWe power unit, cooperating with an ORC cycle. Numerical simulations of the power unit at its nominal operating conditions were conducted to compute its power and electric efficiency. Furthermore, operation of the power unit with an ORC medium was conducted for four types of the medium, i.e., propane, isobutene, pentane and ethanol. As a heat source for the ORC setup, water from the heat recovery system at the temperature of 90 °C supported with steam extracted from the steam turbine, was used. The analysis was performed with use of CFM type numerical codes.
    Źródło:
    Archiwum Energetyki; 2012, 42, 2; 165-174
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increase of power and efficiency of the 900 MW supercritical power plant through incorporation of the ORC
    Autorzy:
    Ziółkowski, P.
    Mikielewicz, D.
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/239975.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    supercritical power plant
    ORC
    regeneration
    thermodynamic analysis
    numerical analysis
    CFM
    nadkrytyczny blok węglowy
    regenerowanie
    analiza termodynamiczna
    analiza numeryczna
    Opis:
    The objective of the paper is to analyse thermodynamical and operational parameters of the supercritical power plant with reference conditions as well as following the introduction of the hybrid system incorporating ORC. In ORC the upper heat source is a stream of hot water from the system of heat recovery having temperature of 90˚C, which is additionally aided by heat from the bleeds of the steam turbine. Thermodynamical analysis of the supercritical plant with and without incorporation of ORC was accomplished using computational flow mechanics numerical codes. Investigated were six working fluids such as propane, isobutane, pentane, ethanol, R236ea and R245fa. In the course of calculations determined were primarily the increase of the unit power and efficiency for the reference case and that with the ORC.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 4; 51-71
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of unsteady flow forces on the thermowell of steam temperature sensor
    Autorzy:
    Kornet, S.
    Sławiński, D.
    Ziółkowski, P.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175578.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    unsteady flow
    resonance
    CFD modeling
    CSD modeling
    Opis:
    In this paper, 3D numerical analysis of unsteady flow forces acting on the thermowell of steam temperature sensor is presented. According to that purpose, the CFD+CSD (computational fluid–solid dynamics) approach has been used. The nonstationary of fluid acting on the thermowell such as: Strouhal frequency, amplitude of pressure, structure of vortex, peak of pressure, field of pressure, field of velocity, etc. are studied analytically and numerically. There have been examined two cases of flow with changing both temperature, pressure and mass flow rate (operating daily and night in the unit with capacity of 380 MWe). In accordance with the standards ASME PTC 19.3 TW-2010 the possibility of entry into resonance has been examined.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 25-49
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A role of the heat and work uncompensated transformations in the balance of entropy and the turbomachinery efficienc
    Autorzy:
    Kowalczyk, T.
    Ziółkowski, P.
    Sławiński, D.
    Cisak, M.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175450.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    entropy balance
    entropy sources
    uncompensated transformations
    isentropic efficiency
    polytropic efficiency
    eulerian fluid
    turbine stage
    Puzyrewski number
    Opis:
    The notion of heat uncompensated transformation has early been introduced by Clausius in 1854 and next, after fifty years of forgetting, in 1904 Duhem has revalorized it and combined it with a new notion of work uncompensated transformation [3]. In this way the so-called ClausiusDuhem inequality has been established. In our paper we wish to present a novelized procedure of estimating the role of the uncompensated transformations of heat and work within the flow of viscous and heat conducting working fluid like water stream. The original procedure was introduced by Puzyrewski and it is essential in expressing of a local, in time and space, balance of entropy. Futhermore, this unique approach leads to redefinition of the efficiency notion, as is usually applied to fluid-flow machineries, to a new one important in computational fluid dynamics (CFD) three-dimensional modeling. As a result, it is shown that usage of the polytropic efficiency, instead of the isentropic efficiency, is more convenient and seems to be natural in CFD approach. Helpfully, we have also found a correlation between those two efficiency definitions with usage of proposed new dimensionless (criterion) number.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 11-27
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentary petrology characteristics and their implications for provenance of Hoanh Bo Basin Neogene system in Quang Ninh province, north-eastern Vietnam
    Autorzy:
    Tha, H.V.
    Wysocka, A.
    Cuong, N. Q.
    Pha, P.D.
    Ziółkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/184381.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    conglomerate
    sandstone
    petrography
    Hoanh Bo Basin
    Neogene
    Vietnam
    Opis:
    The Hoanh Bo Basin has developed over multiple periods since the Miocene period in association with the tectonic activity of the Chi Linh-Hon Gai and Trung Luong Faults. The basin is filled with Neogene continental sediments, comprising mainly polymictic conglomerates, sandstones, siltstones, claystones, and shales. Coarser-grained polymictic deposits predominate along the northern and western margins of the basin, whereas different types of siltstones, claystones, and sandstones occur in its centre, as well as along its southern and eastern parts, toward the Ha Long Bay. The conglomerates and sandstones are composed mainly of quartz and sedimentary rock fragments, and a small amount of mica. Cement is mainly built of iron-oxide, clay or carbonate mud. The source area for the Hoanh Bo Basin sediments was located in the close vicinity of the basin. It was built of strongly weathered rocks of the Hon Gai, Ha Coi, Cat Ba Formations.
    Źródło:
    Geology, Geophysics and Environment; 2017, 43, 1; 69-87
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithofacies and depositional environments of the Paleogene/Neogene sediments in the Hoanh Bo Basin (Quang Ninh province, NE Vietnam)
    Autorzy:
    Hoang, V. T.
    Wysocka, A.
    Phan, D. P.
    Nguyen, Q. C.
    Ziółkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/184794.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    terrestrial environments
    lithofacies
    Paleogene
    Neogene
    Vietnam
    Opis:
    The Hoanh Bo Basin is a multiple period formed basin which is associated with the tectonic mechanism due to the activity of the Chi Linh-Hon Gai and Trung Luong Faults during the late Paleogene – early Neogene time. The basin is filled with continental sediments, comprising mainly polymictic conglomerates, sandstones, siltstones, claystones and shales. Coarser-grained polymictic deposits predominate along the northern and western margins of the basin, while different types of siltstones, claystones, even sandstones occur in its center, as well as along its southern and eastern parts toward the Ha Long Bay. The source rocks for sedimentary materials are mainly originated from rocks of the Hon Gai and Ha Coi Formations. Based on the dominant grain-size class, texture, stratification, degree of clast rounding and sorting, 17 lithofacies were determined in the Hoanh Bo Basin infill. The basin is filled by gravelly, sandy and fine-grained lithofacies just covers a modest area but it represents a full of succession of 4 depositional systems including alluvial fan, fluvial, deltaic and lacustrine environments. Alluvial fan and fluvial environments are characterized by an assemblage of lithofacies such as sand- and mud-supported disorganized breccias (Gb), clast- to sand-supported conglomerates (Gmm), clast-supported inverse-graded conglomerates (Gig), planar-cross-bedded conglomerates (Gp), trough cross-bedded conglomerates (Gt), horizontally stratified conglomerates (Gh), planar cross-bedded sandstones (Sp), trough cross-bedded sandstones (St), ripple cross-laminated sandstones (Sr), horizontally bedded sandstones (Sh), massive sandstones (Sm), massive mudstones, siltstones (Fsm), laminated siltstones and mudstones (Fl), massive claystones (Fm) and coaly lithofacies (C); the deltaic assemblage is dominated by planar-cross-bedded conglomerates (Gp), horizontally stratified conglomerates (Gh), planar cross-bedded sandstones (Sp), horizontally bedded sandstones (Sh), low-angle cross-bedded sandstones (Sl); while the lacustrine assemblage consists of ripple cross-laminated sandstones (Sr), horizontally bedded sandstones (Sh), normally graded sandstones (Sng), massive mudstones, siltstones (Fsm), laminated siltstones and mudstones (Fl), massive claystones (Fm) and coaly lithofacies (C).
    Źródło:
    Geology, Geophysics and Environment; 2015, 41, 4; 353-369
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the Baumann turbine stage operation Part II. Free and kinetic vibrations
    Modelowanie pracy turbinowego stopnia Baumanna, część II – drgania swobodne i wymuszone kinetycznie
    Autorzy:
    Jesionek, K.
    Kron, J.
    Zakrzewski, W.
    Sławiński, D.
    Kornet, S.
    Ziółkowski, P.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/172994.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turbina kondensacyjna
    stopień Baumanna
    CSD
    drgania swobodne
    drgania wymuszone
    condensing turbine
    Baumann's stage
    random vibrations
    forced vibration
    Opis:
    In this paper has been presented a methodology of validation a novel mathematical model dedicated to evaluation and prediction of material degradation and damage of steam turbine elements such as blades, valves, and pipes due to three mechanisms: stress-corrosion, high-temperature creep and low-cyclic fatigue. The validation concept is based on an experimental setup manufactured in the Laboratory of Faculty of Mechanical and Power Engineering, Wrocław UT. The concept of validation by comparison of measured and numerically predicted eigen-frequencies and eigen-modes of different turbine elements within laboratory conditions are presented, and mathematical models of three damage mechanisms have been described. Using the mentioned method of experimental validation based on comparisons of eigen-frequencies, we could calibrate yet unknown coefficients in the turbine damage model. A practical aim is an implementation of a novel life-time module for the BOTT (block of thermal stresses restriction) system. In particular the stress-corrosion factor will be added for the advanced numerical control system, creating in such way a universal, flexible and a complete tool for monitoring degrees of degradation, corrosion and damage of critical points in a steam turbine.
    Niniejszy artykuł jest kolejnym z cyklu, którego celem jest opracowanie numerycznego narzędzia badawczego opartego na CSD (Computational Solid Dynamics). Zadaniem jego byłaby weryfikacja stanu wytrzymałościowego i dynamicznego trudnodostępnych dla pomiarów urządzeń w turbinie takich jak: rurociągi pary świeżej, zawory, wirniki czy łopatki. Narzędzie obserwowałoby rozwijające się mechanizmy: korozji, pełzania wysokotemperaturowego i niskocyklicznego zmęczenia. Ostateczną walidacje modeli numerycznych z eksperymentem zaplanowano wykonać w Laboratorium Wydziału Mechaniczno-Energetycznego Politechniki Wrocławskiej. W tej części cyklu artykułów pokazano m.in. walidację modelu numerycznego z pomiarami drgań, jakie wykonano na stanowisku badawczym oraz w skrócie opisano poszczególne moduły narzędzia. Po implementacji wszystkich modeli do systemu nadzorującego pracę turbozespołu o nazwie BOTT (Blok Ograniczeń Termicznych), powstanie zupełnie nowy, elastyczny i kompletny system monitorujący stopień degradowania się elementów turbozespołu o nazwie ANCS (Advance Numerical Control Systems) działający w sposób on-line.
    Źródło:
    Archiwum Energetyki; 2013, 43, 1/2; 61--74
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the internal efficienty of a turbine stage: classical and computational fuid dynamics definitions
    Autorzy:
    Nastałek, L.
    Karcz, M.
    Sławiński, D.
    Zakrzewski, W.
    Ziółkowski, P.
    Szyrejko, C.
    Topolski, J.
    Werner, B.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175251.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turbine stage
    stage power
    stage efficiency
    losses
    Opis:
    Almost entire fleet of steam turbines in Poland was designed between 1950_1980 with the use of the so-called zero-dimensional (0D) calculation tools. For several years, design and modernization of the turbines occur in assistance with the state-of-the-art methods that describe working fluid flow field based on three-dimensional (3D) models and computational fluid dynamics (CFD) codes. This cooperation between 0D and 3D codes requires exchange of overall, integral information such as: power, efficiency, heat and mass fluxes. In consequence the question arises regarding the cohesion of definitions, and particularly regarding the correctness of the definition for internal efficiency of the turbine's stage and the turbine as a whole. In the present paper we formulate basic definitions reason of efficiency that are naturally adapted to the numerical 0D and 3D models. We show that the main reason of differences between the definitions in 0D and 3D is the definition of the theoretical work of the stage lt. In the classical 0D models, mostly employed is the isentropic approach, and hence the isentropic efficiency occurs. Meanwhile, in the increasingly common 3D approach (most likely by CFD), we use more physically correct pathway by subtracting energy loss from the available energy, that leads to the polytropic definition of efficiency. We show an example of computing the efficiency and the 3D losses, denoted with additional subscript CFD, we also discuss benefits of this definition in comparison with the isentropic classical definition in 0D.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 17-39
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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