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    Wyświetlanie 1-5 z 5
    Tytuł:
    Development of a grinding device for producing coal powder-raw materials of coal-water fuel
    Autorzy:
    Kurytnik, Igor P.
    Khassenov, Ayanbergen K.
    Nussupbekov, Ulan B.
    Karabekova, Dana Z.
    Nussupbekov, Bekbolat R.
    Bolatbekova, Madina
    Powiązania:
    https://bibliotekanauki.pl/articles/2172769.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coal-water fuel installation
    electric pulse installation
    grinding device
    degree of coal
    grinding
    electrode
    instalacja paliwowa węgiel-woda
    instalacja impulsów elektrycznych
    urządzenie do szlifowania
    stopień węgla
    szlifowanie
    elektroda
    Opis:
    This article proposes a method for grinding coal based on the use of the energy of a pulsed shock wave resulting from a spark electric discharge in a liquid. The main purpose of the scientific work is the development of an electric pulse device for producing coal powder, the main component of coal-water fuel. The diameter of the initial coal fraction averaged 3 mm, and the size of the resulting product was 250 μm. To achieve this goal, the dependence of the length of a metal rod electrode (positive electrode) on the length and diameter of its insulation is investigated. Various variants of the shape of the base (bottom) of the device acting as a negative electrode are considered, and an effective variant based on the results of coal grinding is proposed. An experimental electric pulse installation is described, the degree of coal grinding is determined depending on the geometric parameters. The optimal characteristics of the obtained coal powder have been established.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 2; 259--268
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of cyclic combustion of the coal-water suspension
    Autorzy:
    Kijo-Kleczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240737.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cykliczne spalanie
    kinetyka reakcji spalania
    mechanizm procesów spalania paliw
    model matematyczny
    paliwo zawiesinowe
    suspensja węglowo-wodna
    złoże fluidalne
    coal-water suspension
    cyclic combustion of suspension
    fluidized bed
    kinetics of combustion reaction
    mathematical model of coal-water fuel cyclic combustion
    mechanism of fuel combustion
    Opis:
    Combustion technology of the coal-water suspension creates a number of new possibilities to organize the combustion process fulfilling contemporary requirements, e.g. in the environment protection. Therefore the in-depth analysis is necessary to examine the technical application of coal as a fuel in the form of suspension. The research undertakes the complex investigations of the continuous coal-water suspension as well as cyclic combustion. The cyclic nature of fuel combustion results from the movement of the loose material in the flow contour of the circulating fluidized bed (CFB): combustion chamber, cyclone and downcomer. The experimental results proved that the cyclic change of oxygen concentration around fuel, led to the vital change of both combustion mechanisms and combustion kinetics. The mathematical model of the process of fuel combustion has been presented. Its original concept is based on the allowance for cyclic changes of concentrations of oxygen around the fuel. It enables the prognosis for change of the surface and the centre temperatures as well as mass loss of the fuel during combustion in air, in the fluidized bed and during the cyclic combustion.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 1; 45-75
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of fly ash from co-combustion of alternative fuel (SRF) with hard coal in a stoker boiler
    Autorzy:
    Wasielewski, Ryszard
    Wojtaszek, Małgorzata
    Plis, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/205365.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fly ash
    co-combustion of waste with hard coal
    alternative fuel
    SRF
    stoker boiler
    Opis:
    Results of fly ashes from combustion of hard coal and co-combustion of alternative fuel (SRF) with coal in the stoker boiler WR-25 type studies have been shown. Samples of fly ashes were acquired during industrial combustion tests of hard coal and blend of coal with 10% SRF. The scope of comparative research included: chemical composition, contents of combustible parts and trace elements and also of microscopic analysis. The specific surface area SBET was established and tests of water extract were conducted. Chemical composition of mineral substance of both studied ashes is similar. Main ingredients are: SiO2, Al2O3, Fe2O3 and CaO. Fly ash from co-combustion of SRF with coal in a stoker boiler is characterized by high contents of combustible parts (on 30% level), higher than ash from hard coal combustion. Both tested ashes are characterized by specific surface area SBET on the level of 8–9 m2/g. In porous structure mesopores are dominant (>60%), and their volume is higher for fly ash from co-combustion of SRF with coal. Fly ash from co-combustion of waste is characterized by high contents of heavy metals. Nevertheless these metals and also other pollutants do not show leachability exceeding acceptable values for wastes different than hazardous. The microscopic structure of fly ashes from combustion of hard coal and co-combustion of alternative fuel studies showed crucial differences, especially in reference to organic material. Presented research results have shown that fly ash from co-combustion of SRF with coal in a stoker boiler can obtain the status of non-hazardous waste.
    Źródło:
    Archives of Environmental Protection; 2020, 46, 2; 58-67
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clean energy from a carbon fuel cell
    Autorzy:
    Kacprzak, A.
    Kobyłecki, R.
    Bis, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/240175.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomasa
    biowęgiel
    ogniwo paliwowe
    prażenie
    węgiel
    zwęglenie
    biocarbon
    biomass
    carbonization
    coal
    fuel cell
    torrefaction
    Opis:
    The direct carbon fuel cell technology provides excellent conditions for conversion of chemical energy of carbon-containing solid fuels directly into electricity. The technology is very promising since it is relatively simple compared to other fuel cell technologies and accepts all carbon-reach substances as possible fuels. Furthermore, it makes possible to use atmospheric oxygen as the oxidizer. In this paper the results of authors. recent investigations focused on analysis of the performance of a direct carbon fuel cell supplied with graphite, granulated carbonized biomass (biocarbon), and granulated hard coal are presented. The comparison of the voltage-current characteristics indicated that the results obtained for the case when the cell was operated with carbonized biomass and hard coal were much more promising than those obtained for graphite. The effects of fuel type and the surface area of the cathode on operation performance of the fuel cell were also discussed.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 145-155
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on thermal decomposition of waste PE/PP
    Autorzy:
    Kuźnia, M.
    Magdziarz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/184946.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plastic wastes
    supplemental fuel
    blast furnace process
    coking of coal
    odpady z tworzyw sztucznych
    paliwo uzupełniające
    proces wielkopiecowy
    koksowanie węgla
    Opis:
    The most important and the most frequently used plastics are polyethylene (PE) and polypropylene (PP). They are characterised with high heating values (approximately 40 MJ/kg). Moreover, their chemical composition, based mainly on carbon and hydrogen, allows to use them in industrial processes. One of the methods of utilisation of plastic waste can be its use in the metallurgical industry. This paper presents results of thermal decomposition of waste PE/PP. Chemical and thermal analysis (TG) of studied wastes was carried out. Evolved gaseous products from the decomposition of wastes were indentified using mass spectrometry (TG-MS). This paper also presents an application of plastic wastes as supplemental fuel in blast furnace processes (as a substitute for coke) and as an addition in processes of coking coal.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 165-174
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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