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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effect of flue gas recirculation on heat transfer in a supercritical circulating fluidized bed combustor
    Autorzy:
    Błaszczuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240532.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer coefficient
    cluster renewal approach
    flue gas recirculation
    circulating fluidized bed
    współczynnik przenikania ciepła
    recyrkulacja spalin
    cyrkulacyjna warstwa fluidalna
    Opis:
    This paper focuses on assessment of the effect of flue gas recirculation (FGR) on heat transfer behavior in 1296t/h supercritical coal-fired circulating fluidized bed (CFB) combustor. The performance test in supercritical CFB combustor with capacity 966 MWth was performed with the low level of flue gas recirculation rate 6.9% into furnace chamber, for 80% unit load at the bed pressure of 7.7 kPa and the ratio of secondary air to the primary air SA/PA = 0.33. Heat transfer behavior in a supercritical CFB furnace between the active heat transfer surfaces (membrane wall and superheater) and bed material has been analyzed for Geldart B particle with Sauter mean diameters of 0.219 and 0.246 mm. Bed material used in the heat transfer experiments had particle density of 2700 kg/m3. A mechanistic heat transfer model based on cluster renewal approach was used in this work. A heat transfer analysis of CFB combustion system with detailed consideration of bed-to-wall heat transfer coefficient distributions along furnace height is investigated. Heat transfer data for FGR test were compared with the data obtained for representative conditions without recycled flue gases back to the furnace through star-up burners.
    Źródło:
    Archives of Thermodynamics; 2015, 36, 3; 61-83
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of fuzzy logic and cluster renewal approaches for heat transfer modeling in a 1296 t/h CFB boiler with low level of flue gas recirculation
    Autorzy:
    Błaszczuk, A.
    Krzywański, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240406.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fuzzy logic
    heat transfer coefficient
    cluster renewal approach
    flue gas recirculation
    circulating fluidized bed
    logika rozmyta
    współczynnik wnikania ciepła
    recyrkulacja spalin
    cyrkulacyjna warstwa fluidalna
    Opis:
    The interrelation between fuzzy logic and cluster renewal approaches for heat transfer modeling in a circulating fluidized bed (CFB) has been established based on a local furnace data. The furnace data have been measured in a 1296 t/h CFB boiler with low level of flue gas recirculation. In the present study, the bed temperature and suspension density were treated as experimental variables along the furnace height. The measured bed temperature and suspension density were varied in the range of 1131–1156 K and 1.93–6.32 kg/m3, respectively. Using the heat transfer coefficient for commercial CFB combustor, two empirical heat transfer correlation were developed in terms of important operating parameters including bed temperature and also suspension density. The fuzzy logic results were found to be in good agreement with the corresponding experimental heat transfer data obtained based on cluster renewal approach. The predicted bed-to-wall heat transfer coefficient covered a range of 109–241 W/(m2K) and 111–240 W/(m2), for fuzzy logic and cluster renewal approach respectively. The divergence in calculated heat flux recovery along the furnace height between fuzzy logic and cluster renewal approach did not exceeded ±2%.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 1; 91-122
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of covering on the content of macroelements in yield of basil (Ocimum basilicum L.) cultivated for a bunch harvest
    Wpływ stosowanych osłon na zawartość makroelementów w plonie bazylii uprawianej na zbiór pęczkowy
    Autorzy:
    Jadczak, D.
    Blaszczuk, A.
    Rekowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/15610.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    bunch harvest
    covering effect
    macroelement content
    yield
    sweet basil
    basil
    Ocimum basilicum
    Opis:
    The study was carried out in 2002 and 2003. The experimental material was basil plants cultivated in the field for a bunch harvest, using for plant covering perforated foil and polypropylene unwoven cloth. The control object was basil grown without covering. The covers tested in the experiment had a significant influence on the yielding of basil cultivated for a bunch harvest. The highest yield was obtained when polypropylene unwoven cloth was used. Basil plants grown under polypropylene unwoven cloth were the highest (18.2 cm), had the biggest diameter (13.4 cm) and the largest leaves (5.9 cm long and 3.3 cm wide). Using covers (perforated foil and polypropylene unwoven cloth) caused a decrease of dry matter content in the yield of basil, in comparison with the plants grown without covering.The covers used in the study caused a decrease of nitrogen, potassium, calcium and magnesium in the basil yield, but did not decrease phosphorus and sodium content.
    Doświadczenie przeprowadzono w latach 2001-2003 w Katedrze Warzywnictwa Akademii Rolniczej w Szczecinie. Materiał badawczy stanowiła bazylia uprawiana na zbiór pęczkowy z zastosowaniem osłon z folii perforowanej i włókniny polipropylenowej. Badane w doświadczeniu osłony miały istotny wpływ na plonowanie bazylii. Największy plon otrzymano z zastosowaniem osłony z włókniny polipropylenowej. Bazylia uprawiana pod włókniną polipropylenową były najwyższa (18,2 cm), miała największą średnicę (13,4 cm) oraz największe liście (długości 5,9 cm i szerokości 3,3 cm). Zastosowane osłony (folia perforowana i włóknina polipropylenowa) wpłynęły na zmniejszenie zawartości suchej masy w plonie bazylii w porównaniu z jej uprawą bez osłon. Stosowane w doświadczeniu osłony wpłynęły na zmniejszenie w plonie bazylii zawartości azotu, potasu wapnia i magnezu, natomiast nie miały wpływu na zawartość fosforu i sodu w roślinach.
    Źródło:
    Journal of Elementology; 2006, 11, 2
    1644-2296
    Pojawia się w:
    Journal of Elementology
    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:
    The impact of bed particle size in heat transfer to membrane walls of supercritical CFB boiler
    Autorzy:
    Błaszczuk, A.
    Nowak, W.
    Jagodzik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240941.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer coefficient
    cluster renewal approach
    bed particle size
    suspension density
    circulating fluidized bed
    współczynnik wnikania ciepła
    wielkość cząstek
    gęstość zawiesiny
    cyrkulacyjna warstwa fluidalna
    Opis:
    Experimental research has been carried out in a supercritical circulating fluidized bed combustor in order to indicate the effect of the bed particle size on bed-to-wall heat transfer coefficient. The bed inventory used were 0.219, 0.246 and 0.411 mm Sauter mean particles diameter. The operating parameters of a circulating fluidized bed combustor covered a range from 3.13 to 5.11 m/s for superficial gas velocity, 23.7 to 26.2 kg/(m2s) for the circulation rate of solids, 0.33 for the secondary air fraction and 7500 to 8440 Pa pressure drop. Furthermore, the bed temperature, suspension density and the main parameters of cluster renewal approach were treated as experimental variables along the furnace height. The cluster renewal approach was used in order to predict the bed-to-wall heat transfer coefficient. A simple semi-empirical method was proposed to estimate the overall heat transfer coefficient inside the furnace as a function of particle size and suspension density. The computationally obtained results were compared with the experimental data of this work.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 3; 207-223
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Różnorodność glebowego banku nasion i runa wtórnego lasu dębowego w Kozubowskim Parku Krajobrazowym
    Soil seed bank and herb layer diversity within secondary oak forest in the Kozubowski Landscape Park
    Autorzy:
    Halatkiewicz, T.
    Jankowska-Błaszczuk, M.
    Swiercz, A.
    Adamczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/985706.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany debowe
    wtorny drzewostan debowy
    runo lesne
    banki nasion
    glebowy bank nasion
    Kozubowski Park Krajobrazowy
    secondary oak forest
    soil seed bank
    herb layer structure
    nida basin
    Opis:
    The research concerned the evaluation of the soil seed bank and herb layer diversity in the 60−year old secondary oak forest growing in the Kozubowski Landscape Park (Nida Basin, southern Poland). The aim of the studies was to determine the diversity, similarity and species structure of herb layer and soil seed bank within plots situated at different distances from the forest edge as well as to discuss the obtained data with the results of analogous research which were conducted in the natural oak forest in Białowieża (north−eastern Poland). 12 plots 20×20 m were situated in three zones from edge to the centre of the forest (P, S and L; fig. 1). A total of 134 species of vascular plants were recorded in the analysed herb layer (4800 m2). It was found that in the plots closest to the forest edge, both the Shannon’s diversity index and the average density of the herb layer species were significantly higher than on these located deeper in forest (fig. 2, 3). The soil seed bank contained a total of 2820 seeds belonging to 45 species. The density of the seed bank ranged from 1406/m2 (P) to 1061/m2 and 1057/m2 (S and L, respectively). The seed bank species richness showed a constant decrease from zone P to L (fig. 4). The Sörensen species similarity coefficient between the herb layer and the seed bank for the entire forest was 0.43. Although nearly 90% of the seeds of the whole bank belonged to the species present in the herb layer, the species structure of the above ground vegetation was clearly different from that recorded in the bank. It was found that over 66% of all seeds in the bank belonged to Poa nemoralis. A comparative analysis of the studied oak forest and natural oak forest of Białowieża showed: a similar number of forest species in herb layer per 100 m2, similarly high proportion of ancient forest species in the herb layer, much lower species richness of the seed bank as well as its density in the secondary forest. Our results also point to several times lower values of H’ Shannon−Wiener’s biodiversity index, both in the herb layer and the seed bank in comparison to the undisturbed Białowieża oak forest.
    Źródło:
    Sylwan; 2019, 163, 05; 415-424
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Severe hyponatremia due to inappropriate antidiuretic hormone secretion – a case report
    Autorzy:
    Witczak, A.
    Prystupa, A.
    Bilan, A.
    Ignatowicz, A.
    Kwasniewska, K.
    Rekas-Wojcik, A.
    Blaszczuk, M.
    Mosiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/3054.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2012, 06, 1
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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