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    Wyświetlanie 1-3 z 3
    Tytuł:
    New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus
    Autorzy:
    Kriwet, J
    Schmitz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/20414.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Pycnodontiformes
    fish
    paleobiology
    Cretaceous
    pycnodontiform fish
    Germany
    insight
    Neopterygii
    paleobiogeography
    Gyrodus
    Opis:
    The pycnodont fish Gyrodusis reported for the first time from the Lower Cretaceous of Germany based on two lower jaw elements from the Hauterivian and Barremian. The stratigraphic and geographic distribution of Gyrodus is summarized. Gyrodusranges from the Middle Jurassic to the Early Cretaceous making it one of the longest living pycnodonts. Unambiguous Late Cretaceous records of Gyrodus are still missing. Gyrodus displays its widest distribution and greatest taxonomic diversity in the Late Jurassic. The distribution of Gyrodusimplies not only near−coastal mode of life but also a pelagic lifestyle conversely to most other pycnodonts. External body features and function of the unpaired fins support this interpretation.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mass flow and particle size monitoring of pulverised fuel vertical spindle mills
    Autorzy:
    Archary, H.
    Schmitz, W.
    Jestin, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/952678.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mill
    pulveriser
    condition
    monitoring
    młyn
    rozpylacz
    monitorowanie
    Opis:
    The first step towards condition based maintenance of the milling plant is the implementation of on- line condition monitoring of the mill. The following paper pr esents and analyses methods of monitoring the key performance factors of a vertical spindle mill that is suited for implementation on older power stations, i.e. the quantity (mass flow rate) and quality (particle fineness) of the pulverised fuel produced by the mill. It is shown herein that the mill throughput can be monitored on-line using a simple mill energy balance that successfully predicts the coal the roughput within 2.33% as compared to a calibrated coal feeder. A sensitivity analysis reveals that the coal moisture is a critical measurement for this method to be adopted as an on-line mass flow monitoring tool. A laser based particle size analyser tool was tested for use in the power plant environment as an on-line monitoring solution to measure pulverised fuel fineness. It was revealed that several factors around the set-up and operation of the instrument have an influence on the perceived results. Although the instrument showed good precision and repeatability of results, these factors must be taken into account in order to improve the accuracy of the reported results before the instrument can be commissioned as an on-line monitoring solution.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 2; 175-197
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of operation problems at a 200 MWe PF boiler
    Autorzy:
    Peta, S.
    Toit, C. du
    Naidoo, R.
    Schmitz, W.
    Jestin, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185774.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    process flow modeling
    mass and energy balance
    furnace CFD modeling
    PF swirl burner
    proces modelowania przepływu
    bilans masy i energii
    modelowanie pieca CFD
    Opis:
    To minimize oxides of nitrogen (NOx) emission, maximize boiler combustion efficiency, achieve safe and reliable burner combustion, it is crucial to master global boiler and at-the-burner control of fuel and air flows. Non-uniform pulverized fuel (PF) and air flows to burners reduce flame stability and pose risk to boiler safety by risk of reverse flue gas and fuel flow into burners. This paper presents integrated techniques implemented at pilot ESKOM power plants for the determination of global boiler air/flue gas distribution, wind-box air distribution and measures for making uniform the flow being delivered to burners within a wind-box system. This is achieved by Process Flow Modelling, at-the-burner static pressure measurements and CFD characterization. Global boiler mass and energy balances combined with validated site measurements are used in an integrated approach to calculate the total (stoichiometric + excess) air mass flow rate required to burn the coal quality being fired, determine the actual quantity of air that flows through the burners and the furnace ingress air. CFD analysis and use of at-the-burner static, total pressure and temperature measurements are utilized in a 2-pronged approach to determine root-causes for burner fires and to evaluate secondary air distribution between burners.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 3; 305-320
    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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