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    Wyświetlanie 1-3 z 3
    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:
    The Effect of Oxygen Staging on Nitrogen Conversion in Oxy-Fuel CFB Environment
    Autorzy:
    Jankowska, S.
    Czakiert, T.
    Krawczyk, G.
    Borecki, P.
    Jesionowski, Ł.
    Nowak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185424.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    paliwo tlenowe
    CFB
    oxy-fuel
    fuel-N
    Opis:
    This paper presents a study on nitrogen conversion in oxy-fuel coal combustion in a pilot scale CFB 0.1 MWth facility. The paper is focused on fuel-N behaviour in the combustion chamber when the combustion process is accomplished under oxy-fuel CFB conditions. The analysis is based on infurnace sampling of flue gas and calculations of the conversion ratios of fuel-nitrogen (fuel-N) to NO, NO2, N2O, NH3 and HCN. For the tests, O2/CO2 mixtures with the oxygen content of 21 vol.% (primary gas) and with the oxygen content varied from 21 to 35 vol.% (secondary gas), were used as the fluidising gas. Measurements were carried out in 4 control points located along the combustion chamber: 0.43 m, 1.45 m, 2.50 m and 4.88 m. Results presented below indicate that an increased oxygen concentration in the higher part of the combustion chamber has strong influence on the behaviour of fuel based nitrogen compounds.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 4; 489-496
    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 1-3 z 3

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