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Wyszukujesz frazę "steam unit" wg kryterium: Temat

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Selection of the rotor heat-up rate for supercritical parameter turbines
    Autorzy:
    Rusin, A.
    Lipka, M.
    Łukowicz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/240710.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbines
    steel for ultra-supercritical steam unit
    unsteady states
    turbiny parowe
    stal
    jednostka ultra-nadkrytyczna
    warunki niestabilne
    Opis:
    The paper presents the results of the numerical analyses for the steam turbine rotor, dedicated for the newly-designed 900 MW steam unit with supercritical steam parameters (650°C, 30.0 MPa). Basing on the design calculations, an optimal design solution was determined. Review of the available literature on materials for turbine rotors with supercritical steam parameters was done. Then the start-ups of the turbine were simulated. Thermal and strength states were analyzed. As a result, an optimal start-up characteristic was obtained.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 3; 89-104
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power enhancement of the Brayton cycle by steam utilization
    Autorzy:
    Jesionek, K.
    Chrzęszczyk, A.
    Ziółkowski, P.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240390.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analiza numeryczna
    obieg Barytona
    obieg Chenga
    układ gazowo-parowy
    Brayton cycle
    Cheng cycle
    CHP
    gas-steam unit
    numerical analysis
    Opis:
    The paper presents thermodynamic analysis of the gas-steam unit of the 65 MWe combined heat and power station. Numerical analyses of the station was performed for the nominal operation conditions determining the Brayton and combined cycle. Furthermore, steam utilization for the gas turbine propulsion in the Cheng cycle was analysed. In the considered modernization, steam generated in the heat recovery steam generator unit is directed into the gas turbine combustion chamber, resulting in the Brayton cycle power increase. Computational flow mechanics codes were used in the analysis of the thermodynamic and operational parameters of the unit.
    Źródło:
    Archives of Thermodynamics; 2012, 33, 3; 39-50
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic analysis of the double Brayton cycle with the use of oxy combustion and capture of CO2
    Autorzy:
    Ziółkowski, P.
    Zakrzewski, W.
    Badur, J.
    Kaczmarczyk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/240714.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Inverse Brayton cycle
    Brayton cycle
    gas-steam unit
    oxy combustion
    CCS
    thermodynamic analysis
    numerical analysis
    CFM
    Obieg Braytona-Joule'a
    blok gazowo-parowy
    spalanie w tlenie
    analiza termodynamiczna
    analiza numeryczna
    Opis:
    In this paper, thermodynamic analysis of a proposed innovative double Brayton cycle with the use of oxy combustion and capture of CO2, is presented. For that purpose, the computation flow mechanics (CFM) approach has been developed. The double Brayton cycle (DBC) consists of primary Brayton and secondary inverse Brayton cycle. Inversion means that the role of the compressor and the gas turbine is changed and firstly we have expansion before compression. Additionally, the workingfluid in the DBC with the use of oxy combustion and CO2 capture contains a great amount of H2O and CO2, and the condensation process of steam (H2O) overlaps in negative pressure conditions. The analysis has been done for variants values of the compression ratio, which determines the lowest pressure in the double Brayton cycle.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 2; 23-38
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic and economic analysis of a 900 MW ultra-supercritical power unit
    Autorzy:
    Łukowicz, H.
    Dykas, S.
    Rulik, S.
    Stępczyńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/240644.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obieg pary
    parametry apry
    podwójne podgrzewanie
    coal-fired power unit
    double reheat
    steam cycle
    ultra-supercritical steam parameters
    Opis:
    The paper presents a thermal-economic analysis of different variants of a hard coal-fired 900 MW ultra-supercritical power unit. The aim of the study was to determine the effect of the parameters of live and reheated steam on the basic thermodynamic and economic indices of the thermal cycle. The subject of the study was the cycle configuration proposed as the "initial thermal cycle structure" during the completion of the project "Advanced Technologies for Energy Generation" with the live and reheated steam parameters of 650/670 [degrees]C. At the same time, a new concept of a thermal cycle for ultra-supercritical parameters with live and reheated steam temperature of 700/720 [degrees]C was suggested. The analysis of the ultra-supercritical unit concerned a variant with a single and double steam reheat. All solutions presented in the paper were subject to a detailed thermodynamic analysis, as well as an economic one which also included CO2 emissions charges. The conducted economic analysis made it possible to determine the maximum value of investment expenditures at which given solutions are pro.table.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 231-245
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving flexibility characteristics of 200 MW unit
    Autorzy:
    Taler, J.
    Trojan, M.
    Taler, D.
    Dzierwa, P.
    Kaczmarski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/239919.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal power unit
    flexibility increasing
    steam boiler
    rapid start-up
    elektrownia cieplna
    elastyczność
    kocioł parowy
    szybkie uruchamianie
    Opis:
    Calculations were performed of the thermal system of a power plant with installed water pressure tanks. The maximum rise in the block electric power resulting from the shut-off of low-pressure regenerative heaters is determined. At that time, the boiler is fed with hot water from water pressure tanks acting as heat accumulators. Accumulation of hot water in water tanks is also proposed in the periods of the power unit small load. In order to lower the plant electric power in the off-peak night hours, water heated in low-pressure regenerative heaters and feed water tank to the nominal temperature is directed to water pressure tanks. The water accumulated during the night is used to feed the boiler during the period of peak demand for electricity. Drops in the power block electric power were determined for different capacities of the tanks and periods when they are charged. A financial and economic profitability analysis (of costs and benefits) is made of the use of tanks for a 200 MW power unit. Operating in the automatic system of frequency and power control, the tanks may also be used to ensure a sudden increase in the electric power of the unit. The results of the performed calculations and analyses indicate that installation of water pressure tanks is well justified. The investment is profitable. Water pressure tanks may not only be used to reduce the power unit power during the off-peak night hours and raise it in the periods of peak demand, but also to increase the power capacity fast at any time. They may also be used to fill the boiler evaporator with hot water during the power unit start-up from the cold state.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 1; 75-90
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modelling of steam-water cycle with auxiliary empirical functions application
    Autorzy:
    Szapajko, G.
    Rusinowski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/240935.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model pół-empiryczny
    obieg parowo-wodny
    turbina upustowo-kondensacyjna
    układ CHP
    bleed-condensing turbine
    CHP unit
    semi-empirical model
    steam-water cycle
    Opis:
    Research oriented on identification of operating states variations with the application of mathematical models of thermal processes has been developed in the field of energy processes diagnostics. Simple models, characterised by short calculation time, are necessary for thermal diagnostics needs. Such models can be obtained using empirical modelling methods. Good results brings the construction of analytical model with auxiliary empirical built-in functions. The paper presents a mathematical model of a steam-water cycle containing mass and energy balances and semi-empirical models of steam expansion line in turbine as well as heat transfer in exchangers. A model of steam expansion line in a turbine is worked out with the application of a steam flow capacity equation and an internal efficiency of process equation for each group of stages for the analysed turbine. A model of a heat exchanger contains energy balance and the relation describing heat transfer in an exchanger, proposed by Beckman. Estimation of empirical equations coefficients was realised with the application of special and reliable measurements. Estimation criterion was a weighted relative sum of the remainder squares. There are exemplary calculations results presented in the final part of paper.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 3; 165-183
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy evaluation of steam-water cycle operation with mathematical modelling application
    Autorzy:
    Rusinowski, H.
    Szapajko, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/240122.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    krzywe korekcyjne
    model matematyczny
    obieg parowo-wodny
    odchylenia zużycia ciepła
    turbina upustowo-kondensacyjna
    bleed-condensing turbine
    CHP unit
    correction curves
    deviations of specific heat consumption
    mathematical model
    steam-water cycle
    Opis:
    In recent years, we can observe the development of the thermal diagnosis and operating control systems based on measuring techniques and mathematical modelling of processes improvement. Evaluation of the actual operating state is insufficient to make an optimal operating decisions. Thus, information about the influence of the operating parameters. deviations from the reference state on indicators describing energy consumption of the process (for example specific heat consumption or specific energy consumption) is also necessary. The paper presents methods for generation the information about the influence of the steam-water cycle operating parameters on specific heat consumption in a turbine's cycle. A mathematical model of steam-water cycle for a CHP (Cogeneration - also Combined Heat and Power) unit is being worked out. Methods for calculation of operating deviations with the application of correction curves and a mathematical model are described. Exemplary calculation results are presented.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 4; 101-117
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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