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    Wyświetlanie 1-8 z 8
    Tytuł:
    Physical Modelling of Degassing Process by Blowing of Inert Gas
    Autorzy:
    Michalek, K.
    Tkadlečková, M.
    Socha, L.
    Gryc, K.
    Saternus, M.
    Pieprzyca, J.
    Merder, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/351001.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    physical modelling
    refining ladle
    inert gas blowing
    degassing process
    impeller
    Opis:
    This paper deals with the possibilities of using physical modelling to study the degassing of metal melt during its treatment in the refining ladle. The method of inert gas blowing, so-called refining gas, presents the most common operational technology for the elimination of impurities from molten metal, e.g. for decreasing or removing the hydrogen content from liquid aluminium. This refining process presents the system of gas-liquid and its efficiency depends on the creation of fine bubbles with a high interphase surface, uniform distribution, long period of its effect in the melt, and mostly on the uniform arrangement of bubbles into the whole volume of the refining ladle. Physical modelling represents the basic method of modelling and it makes it possible to obtain information about the course of refining processes. On the basis of obtained results, it is possible to predict the behaviour of the real system during different changes in the process. The experimental part focuses on the evaluation of methodical laboratory experiments aimed at the proposal and testing of the developed methods of degassing during physical modelling. The results obtained on the basis of laboratory experiments realized on the specific physical model were discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 987-992
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on the process of recovering low-temperature waste heat from a flue gas in a pilot-scale plant
    Autorzy:
    Szulc, P.
    Tietze, T.
    Wójs, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/185836.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat recovery
    condensation
    inert gas
    odzysk ciepła
    kondensacja
    gaz obojętny
    Opis:
    This paper presents studies carried out in a pilot-scale plant for recovery of waste heat from a flue gas which has been built in a lignite-fired power plant. The purpose of the studies was to check the operation of the heat recovery system in a pilot scale, while the purpose of the plant was recovery of waste heat from the flue gas in the form of hot water with a temperature of approx. 90 °C. The main part of the test rig was a condensing heat exchanger designed and built on the basis of laboratory tests conducted by the authors of this paper. Tests conducted on the pilot-scale plant concerned the thermal and flow parameters of the condensing heat exchanger as well as the impact of the volumetric flow rate of the flue gas and the cooling water on the heat flux recovered. Results show that the system with a condensing heat exchanger for recovery of low-temperature waste heat from the flue gas enables the recovery of much higher heat flux as compared with conventional systems without a condensing heat exchanger.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 4; 529-543
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of the Fluidised Oxidation of Zinc Sulphide Concentrates with an Addition of Inert Materials
    Kinetyka fluidalnego utleniania siarczkowych koncentratów cynku z dodatkiem materiałów obojętnych
    Autorzy:
    Jarosz, P.
    Małecki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/353818.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    roasting
    zinc concentrates
    inert materials
    oxidation kinetics
    prażenie
    koncentraty cynku
    materiały obojętne
    kinetyka utleniania
    Opis:
    This paper presents the results of the kinetic studies of the zinc sulfide concentrate oxidation with the addition of inert, ZnO-containing materials. It was observed that about 15% of zinc oxide addition, obtained from steelmaking dust, improves the rate and maximum degree of oxidation of the concentrate. Kinetic equations of the process were determined, and the activation energy for various additions of inert material was calculated.
    W artykule przedstawiono wyniki badań kinetycznych utleniania koncentratów siarczkowych cynku z dodatkiem materiałów obojętnych, zawierających ZnO. Stwierdzono, że dodatek około 15% tlenku cynku, otrzymanego z recyklingu pyłów stalowniczych, zwiększa szybkość i maksymalny stopień utlenienia koncentratu. Określono równania kinetyczne procesu i energię aktywacji dla różnych dodatków materiału obojętnego.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 4; 1367-1372
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of chosen aspects of a tank gassing-up process on board liquefied petroleum gas carrier. Part II
    Autorzy:
    Wieczorek, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/1845489.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    filling
    tank
    gassing-up
    ideal gas
    gas mixing
    ethylene
    nitrogen
    inert gas
    cargo
    vapour
    Opis:
    The paper presents a thermodynamic analysis of the removal of an inert gas from the tank using the vapor of liquefied petroleum gas cargo (called cargo tank gassing-up operation). For this purpose a thermodynamic model was created which considers two extreme cases of this process. The first is ‘piston pushing’ of inert gas using liquefied petroleum gas vapour. The second case is the complete mixing of both gases and removal the mixture from the tank to the atmosphere until desired concentration or amount of liquefied petroleum gas cargo in the tank is reached. On the example of nitrogen as inert gas and ethylene as a cargo, by thermodynamic analysis an attempt was made to determine the technical parameters of the process, i.e., pressure in the tank, temperature, time at which the operation would be carried out in an optimal way, minimizing the loss of cargo used for gassingup. Calculations made it possible to determine the amount of ethylene used to complete the operation and its loss incurred as a result of total mixing of both gases.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 2; 59-69
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Steam condensation analysis in a power plant condenser
    Autorzy:
    Drożyński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/240848.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    heat transfer
    inert gases
    power plant condenser
    kondensacja
    transport ciepła
    gazy obojętne
    skraplacz energetyczny
    Opis:
    Proposed is the analysis of steam condensation in the presence of inert gases in a power plant condenser. The presence of inert, noncondensable gases in a condenser is highly undesirable due to its negative effect on the efficiency of the entire cycle. In general, thermodynamics has not provided an explicit criterion for assessing the irreversible heat transfer process. The method presented here enables to evaluate precisely processes occurring in power plant condensers. This real process is of particular interest as it involves a number of thermal layers through which heat transfer is observed. The analysis was performed using a simple, known in the literature and well verified Berman’s model of steam condensation in the presence of non-condensable gases. Adapted to the geometry of the condenser, the model enables, for instance, to recognise places where non-condensable gases are concentrated. By describing with sufficient precision thermodynamic processes taking place in the vicinity of the heat transfer area segment, it is possible to determine the distributions of thermodynamic parameters on the boundaries between successive layers. The obtained results allow for the recognition of processes which contribute in varying degrees to irreversible energy degradation during steam condensation in various parts of the examined device.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 4; 3-32
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surfacing 24Cr-5Ni-2.5Mo Duplex Steel Castings by TIG
    Autorzy:
    Kasinska, J.
    Skrzypczyk, A.
    Kalandyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379970.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    duplex cast steel
    surfacing
    Tungsten Inert Gas method
    solution heat treatment
    microstructure change
    staliwo duplex
    proces napawania
    metoda TIG
    obróbka cieplna
    Opis:
    This article discusses the influence of Tungsten Inert Gas (TIG) surfacing of duplex cast steel on its hardness and structure. The samples of 24Cr-5Ni-2.5Mo ferritic-austenitic cast steel were subjected to single-overlay processes with the use of solid wire having the chemical composition similar to that of the duplex cast steel. As a result of the surfacing, the welds were obtained that had no welding imperfections with a smooth transition to the base material. In the test without the heat treatment, directly below the fusion line, we observe a ferrite band with a width of approximately 200 μm without visible austenite areas. Some of the samples were then solution treated (1060°C). Both variants, without and after solution heat treatment, were subjected to testing. Significant changes in the microstructure of the joint were observed after the heat treatment process (heat affected zone and weld microstructure changes). In both areas, an increase in the austenite volume fraction after solution heat treatment was observed. Changes in the microhardness of the ferrite in the HAZ area directly below the fusion line were also observed.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Optimization Parameters on the Efficiency of Aluminium Melt Refining by using Physical Modelling
    Autorzy:
    Walek, Josef
    Michalek, Karel
    Tkadlečková, Markéta
    Powiązania:
    https://bibliotekanauki.pl/articles/2174623.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    physical modelling
    refining ladle
    blowing of inert gas
    degassing of the melt
    impeller
    modelowanie fizyczne
    kadź rafinacyjna
    wdmuchiwanie gazu obojętnego
    odgazowanie stopu
    wirnik
    Opis:
    The article describes the influence of optimization parameters on the efficiency of aluminium melt refining by using physical modelling. The blowing of refining gas, through a rotating impeller into the ladle is a widely used operating technology to reduce the content of impurities in molten aluminium, e.g. hydrogen. The efficiency of this refining process depends on the creation of fine bubbles with a high interphase surface, wide-spread distribution, the residence time of its effect in the melt, and mostly on the wide-spread dispersion of bubbles in the whole volume of the refining ladle and with the long period of their effect in the melt. For physical modelling, a plexiglass model on a scale of 1:1 is used for the operating ladle. Part of the physical model is a hollow shaft used for gas supply equipped with an impeller and also two baffles. The basis of physical modelling consists in the targeted utilization of the similarities of the processes that take place within the actual device and its model. The degassing process of aluminium melt by blowing inert gas is simulated in physical modelling by a decrease of dissolved oxygen in the model liquid (water).
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 3; 60--66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of heat flow in a tube bank of a condenser considering the influence of air
    Autorzy:
    Joachimiak, M.
    Joachimiak, D.
    Krzyślak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/240202.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    inert gas
    mass share of gas noncondensing in water vapor
    Dalton’s law
    water vapor pressure
    air partial pressure
    kondensacja
    gaz obojętny
    Prawo Daltona
    ciśnienie pary wodnej
    ciśnienie parcjalne
    Opis:
    The pressure of wet water vapor inside a condenser has a great impact on the efficiency of thermal cycle. The value of this pressure depends on the mass share of inert gases (air). The knowledge of the spots where the air accumulates allows its effective extraction from the condenser, thus improving the conditions of condensation. The condensation of water vapor with the share of inert gas in a model tube bank of a condenser has been analyzed in this paper. The models include a static pressure loss of the water vapor/air mixture and the resultant changes in the water vapor parameters. The mass share of air in water vapor was calculated using the Dalton’s law. The model includes changes of flow and thermodynamic parameters based on the partial pressure of water vapor utilizing programmed water vapor tables. In the description of the conditions of condensation the Nusselts theory was applied. The model allows for a deterioration of the heat flow conditions resulting from the presence of air. The paper contains calculations of the water vapor flow with the initial mass share of air in the range 0.2 to 1%. The results of calculations clearly show a great impact of the share of air on the flow conditions and the deterioration of the conditions of condensation. The data obtained through the model for a given air/water vapor mixture velocity upstream of the tube bank allow for identification of the spots where the air accumulates.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 3; 119-134
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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