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    Wyświetlanie 1-5 z 5
    Tytuł:
    Characteristics modeling for supercritical circulating fluidized bed boiler working in oxy-combustion technology
    Autorzy:
    Balicki, A.
    Bartela, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/240453.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermodynamic analysis
    oxy-combustion
    supercritical CFB boiler
    analiza termodynamiczna
    oksyspalanie
    nadkrytyczny kocioł CFB
    Opis:
    Among the technologies which allow to reduce greenhouse gas emission, mainly carbon dioxide, special attention deserves the idea of 'zero-emission' technology based on boilers working in oxy-combustion technology. In the paper the results of analyses of the influence of changing two quantities, namely oxygen share in oxidant produced in the air separation unit, and oxygen share in oxidant supplied to the furnace chamber on the selected characteristics of a steam boiler including the degree of exhaust gas recirculation, boiler efficiency and adiabatic flame temperature, was examined. Due to the possibility of the integration of boiler model with carbon dioxide capture, separation and storage installation, the subject of the analysis was also to determine composition of the flue gas at the outlet of a moisture condensation installation. Required calculations were made using a model of a supercritical circulating fluidized bed boiler working in oxy-combustion technology, which was built in a commercial software and in-house codes.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 2; 51-63
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unburned carbon in the circulating fluidised bed boiler fly ash
    Autorzy:
    Kobyłecki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/185654.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kocioł CFB
    popiół lotny
    spalanie węgla
    CFB boiler
    fly ash
    coal combustion
    unburned carbon
    Opis:
    The paper describes the results of various actions and industrial tests conducted in order to decrease the content of unburned carbon in the fly ash of a circulating fluidised bed combustor (CFBC). Several attempts to improve the situation were made and the effects of several parameters on the unburned carbon content in the fly ash were investigated (e.g. bed temperature, cyclone separation efficiency, fuel particle size distribution, boiler hydrodynamics, grid design, and fuel data). Unfortunately, no satisfactory solution to these problems was found. Probably, apart from attrition and char fragmentation, additional factors also contributed to the formation of unburned carbon in the CFBC fly ash.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 255-266
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bed-to-wall heat ransfer in a supercritical circulating fluidised bed boiler
    Autorzy:
    Błaszczuk, A.
    Nowak, W.
    Jagodzik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/185814.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    współczynnik przenoszenia ciepła
    gęstość zawiesiny
    temperatura pieca
    kocioł CFB w stanie nadkrytycznym
    heat transfer coefficient
    suspension density
    furnace temperature
    circulating fluidised bed
    supercritical CFB boiler
    cluster renewal approach
    Opis:
    The purpose of this work is to find a correlation for heat transfer to walls in a 1296 t/h supercritical circulating fluidised bed (CFB) boiler. The effect of bed-to-wall heat transfer coefficient in a long active heat transfer surface was discussed, excluding the radiation component. Experiments for four different unit loads (i.e. 100% MCR, 80% MCR, 60% MCR and 40% MCR) were conducted at a constant excess air ratio and high level of bed pressure (ca. 6 kPa) in each test run. The empirical correlation of the heat transfer coefficient in a large-scale CFB boiler was mainly determined by two key operating parameters, suspension density and bed temperature. Furthermore, data processing was used in order to develop empirical correlation ranges between 3.05 to 5.35 m x s-1 for gas superficial velocity, 0.25 to 0.51 for the ratio of the secondary to the primary air, 1028 to 1137K for bed temperature inside the furnace chamber of a commercial CFB boiler, and 1.20 to 553 kg x m-3 for suspension density. The suspension density was specified on the base of pressure measurements inside the boiler’s combustion chamber using pressure sensors. Pressure measurements were collected at the measuring ports situated on the front wall of the combustion chamber. The obtained correlation of the heat transfer coefficient is in agreement with the data obtained from typical industrial CFB boilers.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 2; 191-204
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermomechanical CSM analysis of a superheater tube in transient state
    Autorzy:
    Taler, D.
    Madejski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/240640.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bojler
    mechanika ciała stałego
    metoda objętości skończonych
    przegrzewacz
    rura
    stan nieustalony
    CFB boiler
    computational solid mechanics
    finite volume method
    omega tube
    superheater
    transient state
    Opis:
    The paper presents a thermomechanical computational solid mechanics analysis (CSM) of a pipe "double omega", used in the steam superheaters in circulating fluidized bed (CFB) boilers. The complex crosssection shape of the "double omega" tubes requires more precise analysis in order to prevent from failure as a result of the excessive temperature and thermal stresses. The results have been obtained using the finite volume method for transient state of superheater. The calculation was carried out for the section of pipe made of low-alloy steel.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 117-126
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Supercritical power plant 600 MW with cryogenic oxygen plant and CCS installation
    Autorzy:
    Kotowicz, J.
    Dryjańska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240262.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CFB oxy boiler
    oxy-combustion system
    supercritical oxy power plant
    electricity generation efficiency
    cryogenic air separation
    kocioł oxy
    system spalania
    elektrownia
    sprawność wytwarzania energii elektrycznej
    kriogeniczny rozdział powietrza
    Opis:
    This article describes a thermodynamic analysis of an oxy type power plant. The analyzed power plant consists of: 1) steam turbine for supercritical steam parameters of 600°C/29 MPa with a capacity of 600 MW; 2) circulating fluidized bed boiler, in which brown coal with high moisture content (42.5%) is burned in the atmosphere enriched in oxygen; 3) air separation unit (ASU); 4) CO2 capture installation, where flue gases obtained in the combustion process are compressed to the pressure of 150 MPa. The circulated fluidized bed (CFB) boiler is integrated with a fuel dryer and a cryogenic air separation unit. Waste nitrogen from ASU is heated in the boiler, and then is used as a coal drying medium. In this study, the thermal efficiency of the boiler, steam cycle thermal efficiency and power demand were determined. These quantities made possible to determine the net efficiency of the test power plant.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 3; 123-137
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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