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Wyszukujesz frazę "Fluidization" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Confined fluidization of fines in fixed bed of coarse particles
    Autorzy:
    Buczek, B.
    Zabierowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/184981.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidization
    confined fluidised bed
    hydrodynamic
    fluidyzacja
    złoże fluidalne
    Opis:
    Experiments on a confined fluidized bed system with various shapes of particles have been presented in the paper. Its influence on hydrodynamic properties in the whole range of gas velocity has been analysed. Relations allowing calculation of the Richardson-Zaki-type equation coefficients, including description of inter-particle void and gas pressure drop in such systems have been determined. Necessary condition for confined fluidization of non-spherical coarse particles has also been determined.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 4; 545-557
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimally controlled heating of solid particles in a fluidised bed with a dispersive flow of the solid
    Autorzy:
    Poświata, A.
    Szwast, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/185641.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimisation
    cost minimization
    fluidised heating
    fluidization
    optymalizacja
    minimalizacja kosztów
    fluidyzacja
    Opis:
    In this study the authors minimise the total process cost for the heating of solid particles in a horizontal fluidised bed by an optimal choice of the inlet heating gas temperature profile and the total gas flow. Solid particles flowed along the apparatus and were heated by a hot gas entering from the bottom of the fluidised apparatus. The hydrodynamics of the fluidised bed is described by a twophase Kunii – Levenspiel model. We assumed that the gas was flowing only vertically, whereas solid particles were flowing horizontally and because of dispersion they could be additionally mixed up in the same direction. The mixing rate was described by the axial dispersion coefficient. As any economic values of variables describing analysing process are subject to local and time fluctuations, the accepted objective function describes the total cost of the process expressed in exergy units. The continuous optimisation algorithm of the Maximum Principle was used for calculations. A mathematical model of the process, including boundary conditions in a form convenient for optimisation, was derived and presented. The optimization results are presented as an optimal profile of inlet gas temperature. The influence of heat transfer kinetics and dispersion coefficients on optimal runs of the heating process is discussed. Results of this discussion constitute a novelty in comparison to information presented in current literature.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 1; 65-76
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental verification of the scaling laws for CFB boilers of different designs
    Autorzy:
    Mirek, P.
    Klajny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185381.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidization
    circulating fluidised bed
    similarity
    scaling
    hydrodynamics
    fluidyzacja
    złoże fluidalne
    hydrodynamika
    Opis:
    In the paper flow dynamic similarity criteria have been presented to reflect the macroscopic flow pattern in the combustion chamber of large-scale circulating fluidised bed boilers. The proposed scaling rules have been verified on two cold models of CFB boilers operating in Tauron Wytwarzanie S.A. - El. Lagisza division (scale factor 1/20) and Fortum Power and Heat Poland Sp. z o. o. Czestochowa division (scale factor 1/10) – working with the power of 966 MW th and 120 MW th, respectively. As follows from the results of measurements, regardless of CFB boiler’s geometry the use of a defined set of criterial numbers allows to obtain satisfactory agreement between the suspension density distributions registered in the CFB boilers and scaling models.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 2; 281-291
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Confined fluidised bed porosity in the light of bubbling-bed models
    Autorzy:
    Zabierowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185800.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidyzacja
    hydrodynamika
    fluidization
    bubbling-bed model
    confined fluidised bed
    hydrodynamics
    bubble diameter
    Opis:
    Based on hydrodynamic data, Kato-Wen and Kunii-Levenspiel bubbling-bed model parameters, supplemented with assumptions characteristic for tested confined fluidised bed, were analysed. The calculated bubble diameters and the bed composition proved essential influence of inter-particle space of packed compacted component onto fluidisation character. The usability of the conducted model analysis was also confirmed. Finally, it can be concluded that Kunii-Levenspiel and Kato-Wen models with characteristic assumptions (for the tested bed) can be applied for calculation of the confined fluidised bed layer porosity. Discrepancies of [epsilon]f value, determined on the basis of the above mentioned bubbling-bed models do not exceed 8% of the error. The model parameters obtained from the matching the model relations to experimental data[epsilon]f = f(uo) allow an analysis of the fluidisation character as well as gas velocity regime and the fluidised bed structural composition identification. A description of the regime of the process in which confined fluidised bed is characterised with an increase of mass and heat transfer rate is also possible using relation (17) derived in the present study.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 3; 431-444
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of Electrical Capacitance Tomography for Research on Phenomena Occurring in the Fluidised Bed Reactors
    Autorzy:
    Porzuczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185005.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ECT
    fluidyzacja
    hydrodynamika
    temperatura
    dystrybucja
    electrical capacitance tomography (ECT)
    fluidization
    hydrodynamics
    temperature
    distribution
    application review
    Opis:
    The paper presents a review of current achievements in the Electrical Capacitance Tomography (ECT) in relation to its possible applications in the study of phenomena occurring in fluidised bed reactors. Reactors of that kind are being increasingly used in chemical engineering, energetics (fluidised bed boilers) or industrial dryers. However, not all phenomena in the fluidised bed have been thoroughly understood. This results in the need to explore and develop new research methods. Various aspects of ECT operation and data processing are described with their applicability in scientific research. The idea for investigation of temperature distribution in the fluidised bed, using multimodal tomography, is also introduced. Metrological requirements of process tomography such as sensitivity, resolution, and speed of data acquiring are noted.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 4; 397-408
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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