Temat: thermochemical - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Synthetic Gas Production from Fine Coal Gasification Using Low-Cost Catalyst
Autorzy:: Andican, Akbar
Faizal, Muhammad
Said, Muhammad
Aprianti, Nabila
Tematy:: syngas
natural zeolite
thermochemical process
energy; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/2086400.pdf Link otwiera się w nowym oknie
Opis:: The utilisation of fine coal waste is still limited, even though its availability is very abundant in the mining industry. This study utilises fine coal by converting it into syngas through catalytic gasification. The gasification process was carried out at a temperature range of 350–550°C for 10–50 minutes using natural zeolite as a catalyst. The syngas composition and quality parameters were evaluated through the H2/CO ratio, heating value, and gasification efficiency. From the research results, fine coal contained high amounts of carbon and fixed carbon. Temperature is the variable that most influences the gasification process. The addition of zeolite actively increased the CO content in the syngas. The H2/CO ratio of syngas >1, the highest HHV and LHV 16.15 and 14.46 MJ/Nm3 with the highest carbon conversion efficiency value of 88.85%, made fine coal very suitable to be used as raw material for the gasification process to produce environmentally friendly syngas.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Termodynamiczne modelowanie procesów spalania i detonacji idealnych układów heterogenicznych. Cz. 1, Podstawy teoretyczne i przegląd modeli
Thermodynamic modelling of combustion and detonation of ideal heterogeneous systems. Part 1, Theoretical fundamentals and a review of models
Autorzy:: Grys, S.
Trzciński, W. A.
Tematy:: złożone układy chemiczne
równowaga termodynamiczna
spalanie
detonacja
kody termochemiczne
complex chemical systems
thermochemical equilibrium
combustion
detonation
thermochemical codes; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/210390.pdf Link otwiera się w nowym oknie
Opis:: W pracy dokonano przeglądu termodynamicznych metod określania równowagi układów chemicznych, które zastosowane w kodach termochemicznych, pozwalają wyznaczyć parametry przemian przebiegających w materiałach wysokoenergetycznych. Pokazano powiązania różnych metod z potencjałem chemicznym reagujących składników i omówiono sposoby wyznaczania równowagi dla reaktywnych, idealnych układów substancji chemicznych.
A review of thermodynamic methods of determination of chemical systems was made. These methods were applied in thermochemical codes used for estimation of decomposition parameters of energetic materials. Connection of the methods with the chemical potential of reactive components was showed. Ways of determination of the equilibrium state for reactive ideal systems were discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Termodynamiczne modelowanie procesów spalania i detonacji idealnych układów heterogenicznych. Cz. 2, Aplikacja numeryczna
Thermodynamic modelling of combustion and detonation of ideal heterogeneous systems. Part 2, Numerical application
Autorzy:: Grys, S.
Trzciński, W. A.
Tematy:: złożone układy chemiczne
równowaga termodynamiczna
spalanie
detonacja
kody termochemiczne
complex chemical systems
thermochemical equilibrium
combustion
detonation
thermochemical codes; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/210394.pdf Link otwiera się w nowym oknie
Opis:: W pracy zaproponowano metodę wyznaczania stanów równowagowych i nierównowagowych wieloskładnikowych układów heterogenicznych i zastosowano ją do obliczania parametrów spalania i detonacji idealnych mieszanin wybuchowych. Sformułowano problem, przedstawiono procedurę jego numerycznego rozwiązania oraz program obliczeniowy. Wyniki obliczeń porównano z rezultatami uzyskanymi za pomocą istniejących kodów termochemicznych oraz z dostępnymi danymi eksperymentalnymi.
The method of determination of equilibrium and non-equilibrium states of multicomponent heterogeneous systems was proposed and it was applied for calculation of combustion and detonation parameters of ideal explosive mixtures. The problem was formulated as well as the procedure of its solution and numerical code were presented. The results of calculations were compared with those obtained from existing thermochemical codes and with available experimental data.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Calculation of Combustion, Explosion and Detonation Characteristics of Energetic Materials
Autorzy:: Grys, S.
Trzciński, W. A.
Tematy:: thermochemical codes
energetic materials
combustion
explosion
detonation; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/358699.pdf Link otwiera się w nowym oknie
Opis:: In this work, the thermodynamic code for the determination of the chemical equilibrium composition of a non-ideal heterogeneous system is presented. Computation of combustion, explosion and detonation parameters for some explosives is performed as well as isentropes of products expansion and detonation energy are estimated. Moreover, the non-equilibrium calculations are carried out, in which chemical inertness of one from the components of explosive composition as well as no heat exchange between the component and the detonation products are assumed. At the end, some calculated detonation characteristics are compared with the experimental ones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Study on surface modification of cerussite by thermochemical processing with pyrite
Autorzy:: Zheng, Yong-Xing
Ning, Ji-Lai
Xie, Haiyun
Lv, Jin-Fang
Hu, Pan-Jin
Pang, Jie
Tematy:: cerussite
pyrite
surface modification
thermochemical processing
flotation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1448573.pdf Link otwiera się w nowym oknie
Opis:: In this paper, surface modification of cerussite by thermochemical processing with pyrite was studied based on microflotation tests, X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA). Microflotation test results showed that the surface modification facilitated flotation of the treated cerussite and improved the flotation recovery to approximately 90%. The results of XRD analyses confirmed that cerussite was transformed into massicot, which then interacted with pyrite to form $PbS$, $PbSO_4$, $PbO•PbSO_4$ and $4PbO•PbSO_4$. XPS analyses results revealed that both $PbS$ and $PbS_2$ were formed on the mineral surface, and the percentage of $PbS$ increased with increasing $FeS_2$/$PbCO_3$ (F/P) mole ratio, which was advantageous for the flotation of the modified cerussite. EPMA analyses showed that particles with layered configurations were obviously formed after thermochemical processing. The thickness of the products at the outer layer of the particles increased when the F/P mole ratio increased. Moreover, the S and O contents in the products increased and decreased, respectively.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Method of determining the strain hardening of carburized elements in Ansys environment
Autorzy:: Wolowiec-Korecka, Emilia
Sawicki, Jacek
Kula, Piotr
Dybowski, Konrad
Lipa, Sebastian
Cytata wydawnicza:: Lipa S., Sawicki J., Wołowiec-Korecka E., Dybowski K., Kula P.: Method of determining the strain hardening of carburized elements in Ansys environment, Solid State Phenomena 240 (2016) 74-80.
Opis:: The paper presents a method based on FEM analysis of determining the stress and strain hardening of elements after the thermochemical treatment. A computational algorithm, which takes into account two factors, has been suggested. Firstly, the gradient of material properties resulting from the changes in the carbon content in the surface layer after the carburizing process. Secondly, the phase transformations occurring during the hardening of the material. The proposed flowchart did not include the flow effect, which greatly reduced the computation time by eliminating tedious CFD calculations. Thanks to an original program Converter coupled with a commercial software's SimHard, SimCarb J Math Pro and Ansys the carburizing process followed by quenching in gases was modeled. In parallel to the numerical calculations the results were verified experimentally. The results of FEM analysis for the tube made of stainless EN 16CrMn5 subjected to three processes of thermochemical treatment have also been presented in the paper. The experimental results were compared with the numerical simulations and a satisfactory convergence has been achieved.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 7.

Tytuł:: Catalytic Gasification of Fine Coal Waste Using Natural Zeolite to Produce Syngas as Fuel
Autorzy:: Aprianti, Nabila
Faizal, Muhammad
Said, Muhammad
Nasir, Subriyer
Fatimura, Muhrinsyah
Masriatini, Rully
Kurniawan, Ian
Sefentry, Aan
Tematy:: fine coal waste
natural zeolite
thermochemical process
hydrogen; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/59113732.pdf Link otwiera się w nowym oknie
Opis:: The valorisation fine coal waste is still very limited in creating energy, especially syngas. This study aims to convert fine coal waste into synthetic gas via gasification using catalyst. Fine coal gasification takes place at 350–750 °C in an updraft gasifier using catalyst of 12.5–25 wt% natural zeolite. The research results show that the addition of zeolite has synergy with increasing temperature. The syngas produced at 750 °C and 12.5 wt% zeolite consisted of 32 vol% H2, 30.1 vol% CO, 27.7 vol% CH4 and 5.1 vol% CO2. The carbon conversion efficiency and high heating value (HHV) of synthetic gas are 88.34% and 18.97 MJ/Nm3. Fine coal has the potential to be reused as an energy source in the future.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Reparametrization of the BKW Equation of State for CHNO Explosives which Release no Condensed Carbon upon Detonation
Autorzy:: Kozyrev, N. V.
Tematy:: thermochemical codes
explosives
detonation
BKW equation of state; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/358800.pdf Link otwiera się w nowym oknie
Opis:: The BKW equation parameters and gaseous product co-volumes were reparametrized for CHNO explosives which release no condensed carbon when detonated. This estimation has led to a more reliable (correct) parameter set of the BKW equation because all of the possible errors due to the uncertainties in the phase composition and equation of state for nanoscale condensed carbon, the inhomogeneity of composite explosives, and so forth, are eliminated. The estimation was performed using an optimization database of 24 explosives, including 121 measurements of detonation velocity and pressure. Three parameters of the BKW equation and the co-volumes of 45 gaseous products were optimized. A set of 10 explosives having a small negative oxygen balance was checked. The resulting set provides a several-fold smaller error in calculating the detonation velocity and a more accurate prediction of the detonation pressure, as compared to the known sets of BKWRDX, BKWR, BKWS, and BKWC.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Comparison of downdraft and updraft gasification of biomass in a fixed bed reactor
Autorzy:: Kluska, J.
Ochnio, M.
Kazimierski, P.
Kardaś, D.
Tematy:: gasification
biomass
thermochemical conversion
gazyfikacja
biomasa
termochemiczna konwersja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240106.pdf Link otwiera się w nowym oknie
Opis:: The aim of this study was to compare and analyze the gasification process of beech wood. The experimental investigation was conducted inside a gasifier, which can be operated in downdraft and updraft gasification system. The most important operating parameter studied in this paper was the influence of the amount of supply air on the temperature distribution, biomass consumption and syngas calorific value. The results show that the amount of air significantly influences the temperature in the combustion zone for the downdraft gasification process, where temperature differences reached more than 150 °C. The increased amount of air supplied to the gasifier caused an increase in fuel consumption for both experimental setups. Experimental results regarding equivalence ratio show that for value below 0.2, the updraft gasification is characterized by a higher calorific value of producer gas, while for about 0.22 a similar calorific value (6.5 MJ/Nm3) for both gasification configurations was obtained. Above this value, an increase in equivalence ratio causes a decrease in the calorific value of gas for downdraft and updraft gasifiers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Influence of thermochemical treatment methods on pitting corrosion resistance of Ti6Al4V alloy
Autorzy:: Czerniak-Reczulska, M.
Burnat, B.
Grabarczyk, J.
Tematy:: Ti6Al4V alloy
corrosion
thermochemical treatment; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/285526.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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