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    Wyświetlanie 1-8 z 8
    Tytuł:
    Neuro-fuzzy control design of processes in chemical technologies
    Autorzy:
    Blahová, L.
    Dvoran, J.
    Kmeťová, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/229832.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neuro-fuzzy control
    chemical reactor
    neural predictive controller
    ANFIS
    laboratory process
    Opis:
    The paper presents design of neuro-fuzzy control and its application in chemical technologies. Our approach to neuro-fuzzy control is a combination of the neural predictive controller and the neuro-fuzzy controller (Adaptive Network-based Fuzzy Inference System - ANFIS). These controllers work in parallel. The output of ANFIS adjusts the output of the neural predictive controller to enhance the control performance. Such design of an intelligent control system is applied to control of the continuous stirred tank reactor and laboratory mixing process.
    Źródło:
    Archives of Control Sciences; 2012, 22, 2; 233-250
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the Oscillation Period of Chemical Reactors by Chaotic Sampling of the Conversion Degree
    Autorzy:
    Lawnik, M.
    Berezowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185723.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reaktor chemiczny
    adaptacyjne próbkowania
    identyfikacja sygnału
    chemical reactor
    adaptive sampling
    signal identification
    Opis:
    To stabilise the periodic operation of a chemical reactor the oscillation period should be determined precisely in real time. The method discussed in the paper is based on adaptive sampling of the state variable with the use of chaotic mapping to itself. It enables precise determination of the oscillation period in real time and could be used for a proper control system, that can successfully control the process of chemical reaction and maintain the oscillation period at a set level. The method was applied to a tank reactor and tubular reactor with recycle.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 3; 387-393
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a Simulation Model for Controlling and Improving the Productivity of Batch Reactors
    Autorzy:
    Henini, G.
    Souahi, F.
    Laidani, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/779240.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    batch chemical reactor
    thermal control
    dynamic simulator
    mono-fluid
    heating and cooling system
    Opis:
    This paper describes the development of a dynamic simulator model for a jacketed batch reactor equipped with a mono-fluid heating/cooling system. The Mono-fluid flows at constant flow-rate through the jacketed reactor. The heating and cooling are assured respectively by electrical resistance and two plate heat exchangers. A detailed description of the equations leading to the development of simulation model is presented. The model is based on writing the equations of the mass balance and the heat balance for the reactor and the thermal loop in unsteady state. To validate the simulation model, we first studied the thermal behavior of the reaction mixture during heating and cooling, using water as the reaction mixture. We then considered the consecutive chemical reaction of the synthesis of cyclopentanediol from cyclopentadiene by studying the yield of this reaction. The results show that heating the reaction mixture increases significantly the yield of this synthesis reaction.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 1; 78-87
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method of suppressing chaos in a chemical reactor and the use of chaos for identifying the reactor model
    Autorzy:
    Berezowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/185736.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chemical reactor
    recycle
    chaos
    control
    fractals
    identification
    reaktor chemiczny
    recykling
    kontrola
    fraktale
    identyfikacja
    Opis:
    A method of suppressing chaotic oscillations in a tubular reactor with mass recycle is discussed. The method involves intervention in the temperature of the input flow by the recirculation flow and the temperature set from the exterior. The most advantageous solution was proved to be heat coupling elimination and maintenance of the reactor input temperature on the set level. Moreover, the reactor modelwas identified on the basis of a chaotic solution, as it provides the biggest entropy of information.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 3; 265--272
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Hopf bifurcation sets of a chemicalreactors by two-parameter continuation method
    Autorzy:
    Berezowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/185121.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chemical reactor
    Hopf bifurcation
    thank reactor
    bifurcation diagram
    steady state
    stability
    dynamics
    reaktor chemiczny
    Rozwidlenie Hopfa
    diagram bifurkacji
    stan stabilny
    stabilność
    dynamika
    Opis:
    A two-parameter continuation method was developed and shown in the form of an example, allowingdetermination of Hopf bifurcation sets in a chemical reactor model. Exemplary calculations weremade for the continuous stirred tank reactor model (CSTR). The set of HB points limiting the rangeof oscillation in the reactor was determined. The results were confirmed on the bifurcation diagramof steady states and on time charts. The method is universal and can be used for various models ofchemical reactors.
    Źródło:
    Chemical and Process Engineering; 2020, 41, 3; 221--227
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study on extraction of tritium generated in HMR by way of system composed of EXEL-process and thermal diffusion column cascade
    Autorzy:
    Shimizu, M.
    Takeshita, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146995.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    chemical exchange reaction
    heavy water
    isotope separation
    thermal diffusion
    trickel-bed reactor
    tritium
    Opis:
    A new tritium extraction system composed of a trickle-bed hydrogen/water isotopic exchange column using a hydrophobic Pt-catalyst combined with an SPE-water electrolyser (EXEL-process) and a thermal diffusion column cascade was proposed for the removal of tritium from heavy water irradiated in HMR ((Heavy Water Moderated Power Reactor), volume of heavy water = 140 m3 and mean neutron flux = 5×1013 n/cm2s). Numerical study on the extraction of tritium from the heavy water was carried out and the dimensions of proposed system were determined under the conditions that the concentration of tritium in the heavy water was kept less than 2.5 Ci/lHW. The calculation results indicated that the proposed system was designed practically.
    Źródło:
    Nukleonika; 2002, 47,suppl.1; 89-93
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbonaceous materials in petrochemical wastewater before and after treatment in an aerated submerged fixed-bed biofilm reactor
    Autorzy:
    Trojanowicz, K.
    Wojcik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185052.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Chemical Oxygen Demand fractions
    petrochemical wastewater
    biofilm reactor
    zapotrzebowanie tlenu
    petrochemiczne ścieki
    reaktor
    Opis:
    Results of the studies for determining fractions of organic contaminants in a pretreated petrochemical wastewater flowing into a pilot Aerated Submerged Fixed-Bed Biofilm Reactor (ASFBBR) are presented and discussed. The method of chemical oxygen demand (COD) fractionation consisted of physical tests and biological assays. It was found that the main part of the total COD in the petrochemical, pretreated wastewater was soluble organic substance with average value of 57.6%. The fractions of particulate and colloidal organic matter were found to be 31.8% and 10.6%, respectively. About 40% of COD in the influent was determined as readily biodegradable COD. The inert fraction of the soluble organic matter in the petrochemical wastewater constituted about 60% of the influent colloidal and soluble COD. Determination of degree of hydrolysis (DH) of the colloidal fraction of COD was also included in the paper. The estimated value of DH was about 62%. Values of the assayed COD fractions were compared with the same parameters obtained for municipal wastewater by other authors.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 3; 373-382
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on the course of complex processes carried out in vortex impinging jet reactors
    Autorzy:
    Wojtas, K.
    Rybałtowska, A.
    Witkowski, D.
    Makowski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/115849.pdf
    Data publikacji:
    2015
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    jet reactor
    mixing
    chemical reaction
    precipitation
    numerical simulation
    reaktor strumieniowy
    mieszanie
    reakcja chemiczna
    osad
    symulacja numeryczna
    Opis:
    The paper presents an application of CFD simulations to predict a course of complex processes carried out in jet reactors. In this work the simulations results were verified with PIV and PLIF techniques and validated by comparing model predictions with experimental data for fast parallel chemical test reactions. Experimental results of BaSO4 precipitation in jet reactors are also discussed.
    Źródło:
    Challenges of Modern Technology; 2015, 6, 4; 31-35
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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