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Wyszukujesz frazę "circulating fluidised bed" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    The influence of sampling point on solids suspension density applied in scaling of the hydrodynamics of a supercritical CFB boiler
    Autorzy:
    Mirek, P.
    Ziaja, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185607.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydrodynamika
    skalowanie
    circulating fluidised bed
    hydrodynamics
    scaling
    Opis:
    The article presents the results of laboratory tests carried out on a scaling model of the 966MW the fluidised-bed boiler operating in the Lagisza Power Plant, made on a scale of 1:20 while preserving the geometrical similarity. The tests were carried out for scaled-down material taken from different locations on the circulation contour in the state of full boiler loading. To reflect the hydrodynamic conditions prevailing in the combustion chamber, solids with properly selected density and particle size distribution were used. The obtained results have made it possible to determine the location for taking the most representative granular material sample.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 391-399
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sampling related issues in pod-based model reduction of simplified circulating fluidised bed combustor model
    Autorzy:
    Bizon, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/185585.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model reduction
    proper orthogonal decomposition
    circulating fluidised bed
    optimal sampling
    redukcja modelu
    złoże fluidalne
    próbkowanie
    Opis:
    Over the last decades the method of proper orthogonal decomposition (POD) has been successfully employed for reduced order modelling (ROM) in many applications, including distributed parameter models of chemical reactors. Nevertheless, there are still a number of issues that need further investigation. Among them, the policy of the collection of representative ensemble of experimental or simulation data, being a starting and perhaps most crucial point of the POD-based model reduction procedure. This paper summarises the theoretical background of the POD method and briefly discusses the sampling issue. Next, the reduction procedure is applied to an idealised model of circulating fluidised bed combustor (CFBC). Results obtained confirm that a proper choice of the sampling strategy is essential for the modes convergence however, even low number of observations can be sufficient for the determination of the faithful dynamical ROM.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 3; 365-376
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model research of gas emissions from lignite and biomass co-combustion in a large scale CFB boiler
    Autorzy:
    Krzywański, J.
    Rajczyk, R.
    Nowak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/184895.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomasa
    złoże fluidalne
    współspalanie
    węgiel brunatny
    modelowanie
    biomass
    circulating fluidised bed
    co-combustion
    lignite
    modelling
    Opis:
    The paper is focused on the idea of a combustion modelling of a large-scale circulating fluidised bed boiler (CFB) during coal and biomass co-combustion. Numerical computation results for three solid biomass fuels co-combustion with lignite are presented in the paper. The results of the calculation showed that in previously established kinetics equations for coal combustion, some reactions had to be modified as the combustion conditions changed with the fuel blend composition. Obtained CO2, CO, SO2 and NOx emissions are located in borders of ± 20% in the relationship to the experimental data. Experimental data was obtained for forest biomass, sunflower husk, willow and lignite cocombustion tests carried out on the atmospheric 261 MWe COMPACT CFB boiler operated in PGE Turow Power Station in Poland. The energy fraction of biomass in fuel blend was: 7%wt, 10%wt and 15%wt. The measured emissions of CO, SO2 and NOx (i.e. NO + NO2) were also shown in the paper. For all types of biomass added to the fuel blends the emission of the gaseous pollutants was lower than that for coal combustion.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 2; 217-231
    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:
    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
      Wyświetlanie 1-5 z 5

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