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Wyszukujesz frazę "Bizon, K." wg kryterium: Autor


Wyświetlanie 1-3 z 3
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:
Dynamical and technological consequences of multiple isolas of steady states in a catalytic fluidised-bed reactor
Autorzy:
Bizon, K.
Powiązania:
https://bibliotekanauki.pl/articles/185405.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
catalytic fluidised-bed reactor
steady states
non-linear analysis
multiplicity
multiple isolas
reaktor katalityczny ze złożem fluidalnym
stan stały
analiza nieliniowa
Opis:
Steady-state characteristics of a catalytic fluidised bed reactor and its dynamical consequences are analyzed. The occurrence of an untypical steady-state structure manifesting in a form of multiple isolas is described. A two-phase bubbling bed model is used for a quantitative description of the bed of catalyst. The influence of heat exchange intensity and a fluidisation ratio onto the generation of isolated solution branches is presented for two kinetic schemes. Dynamical consequences of the coexistence of such untypical branches of steady states are presented. The impact of linear growth of the fluidisation ratio and step change of the cooling medium temperature onto the desired product yield is analyzed. The results presented in this study confirm that the identification of a region of the occurrence of multiple isolas is important due to their strong impact both on the process start-up and its control.
Źródło:
Chemical and Process Engineering; 2017, 38, 3; 411-422
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption with chemical reaction in porous catalyst pellets under alternate concentration fields. Uniform temperature case
Autorzy:
Bizon, K.
Tabiś, B.
Powiązania:
https://bibliotekanauki.pl/articles/185479.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
catalyst pellets
reaction
diffusion
adsorption
dynamics
peleta katalityczna
reakcja
dyfuzja
adsorpcja
dynamika
Opis:
The work concerns the dynamic behaviour of a porous, isothermal catalyst pellet in which a simultaneous chemical reaction, diffusion and adsorption take place. The impact of the reactant adsorption onto the pellet dynamics was evaluated. A linear isotherm and a non-linear Freundlich isotherm were considered. Responses of the pellet to sinusoidal variations of the reactant concentration in a bulk gas were examined. It was demonstrated that the dynamics of the pellet is significantly affected both by accounting for the adsorption and by the frequency of the bulk concentration variations. The sorption phenomenon causes damping of the concentration oscillations inside the pellet and damping of its effectiveness factor oscillations. Depending on the frequency of the concentration oscillations in the bulk, the remarkable oscillations can involve an entire volume of the pellet or its portion in the vicinity of the external surface.
Źródło:
Chemical and Process Engineering; 2016, 37, 4; 473-484
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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