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    Wyświetlanie 1-4 z 4
    Tytuł:
    Hydrodynamics of gas flow through anisotropic porous materials in phenomenological and numerical terms
    Autorzy:
    Wałowski, G.
    Filipczak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/240286.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biochar
    coke
    CFD
    permeability
    biowęgiel
    koks
    filtracja
    Opis:
    This study discusses results of experiments on hydrodynamic assessment of gas flow through backbone (skeletal) porous materials with an anisotropic structure. The research was conducted upon materials of diversified petrographic characteristics – cokes. The study was conducted for a variety of hydrodynamic conditions, using air. The basis for assessing hydrodynamics of gas flow through porous material was a gas stream that results from the pressure forcing such flow. The results of measurements indicate a clear impact of the type of material on the gas permeability, and additionally – as a result of their anisotropic internal structure – to a significant effect of the flow direction on the value of gas stream. In aspect of scale transfer problem, a method of mapping the flow geometry of skeletal materials has been developed and usefulness of numerical methods has been evaluated to determine pressure drop and velocity distribution of gas flow. The results indicate the compliance of the used calculation method with the result of experiments.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 3; 149-167
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbonization of biomass – an efficient tool to decrease the emission of CO2
    Autorzy:
    Kobyłecki, R.
    Ścisłowska, M.
    Bis, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/240225.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biochar
    biocoal
    biocarbon
    biomass
    CCS
    CO2 removal
    biowęgiel
    biomasa
    usuwanie CO2
    Opis:
    The paper presents the results and analysis of biomass processing in order to provide the conditions for the most profitable use of the biomass in modern and efficient power generation systems with particular attention put on the decrease of the emission of carbon dioxide (CO2) and no need to develop carbon capture and storage plants. The promising concept of CO2 storage via the production of biochar and the advantages of its application as a promising carbon sink is also presented and the results are supported by authors’ own experimental data. The idea enables the production of electricity, as well as (optionally) heat and cold from the thermal treatment of biomass with simultaneous storage of the CO2 in a stable and environmentally-friendly way. The key part of the process is run in a specially-designed reactor where the biomass is heated up in the absence of oxygen. The evolved volatile matter is used to produce heat/cold and electricity while the remaining solid product (almost completely dry residue) is sequestrated in soil. The results indicate that in order to reduce the emission of CO2 the biomass should rather be 'cut and char' than just 'cut and burn', particularly that the charred biomass may also become a significant source of nutrients for the plants after sequestration in soil.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 3; 185-195
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    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:
    The effects of operating conditions on the performance of a direct carbon fuel cell
    Autorzy:
    Kacprzak, A.
    Kobylecki, R.
    Bis, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/240862.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    direct carbon fuel cell
    biochar
    molten hydroxide electrolyte
    carbon anode
    air cathode
    węglowe ogniwa paliwowe
    biowęgiel
    elektrolity stopionych wodorotlenków
    anoda węglowa
    Opis:
    The influences of various operating conditions including cathode inlet air flow rate, electrolyte temperature and fuel particles size on the performance of the direct carbon fuel cell DCFC were presented and discussed in this paper. The experimental results indicated that the cell performance was enhanced with increases of the cathode inlet gas flow rate and cell temperature. Binary alkali hydroxide mixture (NaOH-LiOH, 90-10 mol%) was used as electrolyte and the biochar of apple tree origin carbonized at 873 K was used as fuel. Low melting temperature of the electrolyte and its good ionic conductivity enabled to operate the DCFC at medium temperatures of 723-773 K. The highest current density (601 A m-2) was obtained for temperature 773 K and air flow rate 8.3 x 106 m3s-1. It was shown that too low or too high air flow rates negatively affect the cell performance. The results also indicated that the operation of the DCFC could be improved by proper selection of the fuel particle size.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 4; 187-197
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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