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    Wyświetlanie 1-7 z 7
    Tytuł:
    Electron beam treatment of simulated marine diesel exhaust gases
    Autorzy:
    Licki, J.
    Pawelec, A.
    Zimek, Z.
    Witman-Zając, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148426.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron accelerator
    electron beam treatment
    free radicals
    marine diesel exhaust gases
    NOx removal
    seawater scrubber
    Opis:
    The exhaust gases from marine diesel engines contain high SO2 and NOx concentration. The applicability of the electron beam flue gas treatment technology for purification of marine diesel exhaust gases containing high SO2 and NOx concentration gases was the main goal of this paper. The study was performed in the laboratory plant with NOx concentration up to 1700 ppmv and SO2 concentration up to 1000 ppmv. Such high NOx and SO2 concentrations were observed in the exhaust gases from marine high-power diesel engines fuelled with different heavy fuel oils. In the first part of study the simulated exhaust gases were irradiated by the electron beam from accelerator. The simultaneous removal of SO2 and NOx were obtained and their removal efficiencies strongly depend on irradiation dose and inlet NOx concentration. For NOx concentrations above 800 ppmv low removal efficiencies were obtained even if applied high doses. In the second part of study the irradiated gases were directed to the seawater scrubber for further purification. The scrubbing process enhances removal efficiencies of both pollutants. The SO2 removal efficiencies above 98.5% were obtained with irradiation dose greater than 5.3 kGy. For inlet NOx concentrations of 1700 ppmv the NOx removal efficiency about 51% was obtained with dose greater than 8.8 kGy. Methods for further increase of NOx removal efficiency are presented in the paper.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 689-695
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rate constants of electron-beam PAHs decomposition
    Autorzy:
    Gerasimov, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/147629.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam flue gas treatment
    PAHs decomposition
    rate constants
    hydroxyl radical
    Opis:
    The generalized kinetic model of the electron-beam induced processes in industrial flue gases elaborated earlier is used for the estimation of rate constants of hydroxyl-radicals interaction with high-ringed aromatic compounds. These data are received by means of the fit of the calculated PAHs concentrations to the measured ones as applied to benzo(a)anthracene, benzo(e)pyrene, benzo(a)pyrene, perylene, and dibenzo(a,h)anthracene. It is shown that the concentrations of PAHs decrease by more than an order of magnitude at the absorbed dose D = 20 kGy for compounds with rate constant of their interaction with OH-radical more than 1013 cm3źmol 1źs 1.
    Źródło:
    Nukleonika; 2007, 52, 3; 105-108
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combination of methods of thermal and radiation treatment of sediments associated with PCBs : the Delor type
    Autorzy:
    Fülöp, Marko
    Šagátová, Andrea
    Benkovský, Ivan
    Prokes, Karel
    Foltinova, Lubica
    Powiązania:
    https://bibliotekanauki.pl/articles/2055684.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam
    heat treatment
    polychlorinated biphenyls
    radiation degradation
    Opis:
    An efficient method of burning polychlorinated biphenyls (PCBs) is often used to remove the environmental burden of PCBs. However, combustion produces toxic dioxins and furans (PCDD/F), so residents are increasingly rejecting this method. The heat treatment (HT) method does not burn PCBs but evaporates it from sediments. Even in this process, PCDD/Fs are formed to a lesser extent, which are destroyed by radiation processing (RP) following the HT. At the same time, the RP method degrades PCB congeners down to biphenyls, which decompose easily in the environment. A block assembly of a complex synergistic combination of equipment for methods of thermal (HT) and radiation (RP) destruction of PCBs in sediments is proposed. The efficacy of this complex was preliminarily determined at a level of 70-fold reduction in PCB concentration in sediments. To achieve a higher reduction factor in the concentration of PCBs, possible procedures for optimizing the settings of individual devices of this complex are presented.
    Źródło:
    Nukleonika; 2021, 66, 4; 207--211
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remediation of polluted waters and wastewater by radiation processing
    Autorzy:
    Sampa, M. H. O.
    Takács, E.
    Gehringer, P.
    Rela, P. R.
    Ramirez, T.
    Amro, H.
    Trojanowicz, M.
    Botelho, M. L.
    Han, B.
    Solpan, D.
    Cooper, W. J.
    Emmi, S. S.
    Wojnárovits, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/147644.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam
    wastewater treatment
    pesticides
    dyes
    degradation
    radiation technology
    Opis:
    Application of radiation processing for drinking water, wastewater, and groundwater treatment is a cost effective process which may insure adequate availability of that resource worldwide. This paper summarizes the results of a Coordinated Research Project (organized by the IAEA) with participants from 10 countries with the purpose of describing the degradation mechanism of organic impurities, and establishing optimal treatment conditions. Decoloration, disinfection, microbiological and toxicological experiments are also mentioned. These experiments led to pilot plants and also to a large scale industrial realization of radiation technology.
    Źródło:
    Nukleonika; 2007, 52, 4; 137-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plasma technology to remove NOx from off-gases
    Autorzy:
    Pawelec, Andrzej
    Chmielewski, Andrzej G.
    Sun, Yongxia
    Bułka, Sylwester
    Torims, Toms
    Pikurs, Guntis
    Mattausch, Gösta
    Powiązania:
    https://bibliotekanauki.pl/articles/2055686.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam
    flue gas treatment
    marine diesel engines
    NOx
    SOx
    ship emissions
    Opis:
    Operation of marine diesel engines causes signifi cant emission of sulphur and nitrogen oxides. It was noticed worldwide and the regulations concerning harmful emissions were introduced. There were several solutions elaborated; however, emission control for both SOx and NOx requires two distinctive processes realized in separated devices, which is problematic due to limited space on ship board and high overall costs. Therefore, the electron beam flue gas treatment (EBFGT) process was adopted to ensure the abatement of the problem of marine diesel off-gases. This novel solution combines two main processes: fi rst the fl ue gas is irradiated with electron beam where NO and SO2 are oxidized; the second stage is wet scrubbing to remove both pollutants with high efficiency. Laboratory tests showed that this process could be effectively applied to remove SO2 and NOx from diesel engine off-gases. Different compositions of absorbing solution with three different oxidants (NaClO, NaClO2 and NaClO3) were tested. The highest NOx removal efficiency (>96%) was obtained when seawater-NaClO2-NaOH was used as scrubber solution at 10.9 kGy dose. The process was further tested in real maritime conditions at Riga shipyard, Latvia. More than 45% NOx was removed at a 5.5 kGy dose, corresponding to 4800 Nm3 /h off-gases arising from ship emission. The operation of the plant was the first case of examination of the hybrid electron beam technology in real conditions. Taking into account the experiment conditions, good agreement was obtained with laboratory tests. The results obtained in Riga shipyard provided valuable information for the application of this technology for control of large cargo ship emission.
    Źródło:
    Nukleonika; 2021, 66, 4; 227--231
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review on electron beam flue gas treatment (EBFGT) as a multicomponent air pollution control technology
    Autorzy:
    Basfar, A. A.
    Fageeha, O. I.
    Kunnummal, N.
    Chmielewski, A. G.
    Licki, J.
    Pawelec, A.
    Zimek, Z.
    Warych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148616.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fossil fuel combustion
    heavy fuel oil
    electron beam irradiation
    plasma processes
    flue gas treatment
    SO2 removal
    NOx removal
    Źródło:
    Nukleonika; 2010, 55, 3; 271-277
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Structure and Coefficient of Friction of Welded Nickel Alloys Inconel 625 and Inconel 718
    Struktura i współczynnik tarcia spawanych połączeń stopów niklu Inconel 625 i Inconel 718
    Autorzy:
    Strzelczak, K.
    Dudek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/971338.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    friction coefficient
    friction force
    Scratch Tester
    hardness
    heat treatment
    Inconel 625
    Inconel 718
    electron beam welding
    współczynnik tarcia
    siła tarcia
    twardość
    obróbka cieplna
    spawanie wiązką elektronów
    Opis:
    In this study, the coefficients of friction for three series of welded nickel alloy joints, subjected to different heat treatments (lack of heat treatment, solution heat treatment, precipitation hardening), were determined. Heat treatment of the prepared samples was aimed at eliminating the structural and stress gradient, because the electron beam welding technique is dedicated for constructions with very high quality and strength requirements. Given the nature of the electron beam process, the authors are aware that the obtained weld’s structures are characterized by different properties from parent materials, and also from structures melted under equilibrium conditions. The scientific aim of the presented work is to determine the influence of heat treatment on the microstructure, mechanical properties, and performance of dissimilar joints of nickel alloys Inconel 625 and Inconel 718. In order to determine the coefficient of friction for samples, the scratch test method was used. As a result of the research, it was proved that subjecting the welds to the precipitation hardening has a significant effect on abrasion resistance.
    Wyznaczono współczynniki tarcia dla trzech serii próbek poddanych odmiennym procesom obróbki cieplnej (brak obróbki cieplnej, przesycanie, utwardzanie wydzieleniowe). Obróbka cieplna przygotowanych próbek miała na celu zlikwidowanie gradientu strukturalnego i naprężeniowego, ponieważ spawanie wiązką elektronów dedykowane jest dla urządzeń o bardzo wysokich wymaganiach jakościowych i wytrzymałościowych. Biorąc pod uwagę charakter procesu spawania wiązką, autorzy mają świadomość, iż uzyskane struktury będą cechowały się zdecydowanie odmiennymi własnościami od materiału rodzimego, ale również i od struktur przetopionych w warunkach bliskich warunkom równowagowym. Celem naukowym pracy jest określenie wpływu obróbki cieplnej na mikrostrukturę, własności mechaniczne i użytkowe różnoimiennych połączeń stopów niklu Inconel 625 oraz Inconel 718. W celu wyznaczenia współczynników tarcia dla próbek zastosowano metodę zarysowania scratch test. W wyniku przeprowadzonych badań dowiedziono, że poddanie spoin procesowi utwardzania wydzieleniowego ma znaczący wpływ na odporność na ścieranie.
    Źródło:
    Tribologia; 2018, 281, 5; 109-115
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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