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Wyświetlanie 1-10 z 39
Tytuł:
Numerical generation of a fixed bed structure
Autorzy:
Marek, M.
Powiązania:
https://bibliotekanauki.pl/articles/185277.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fixed bed
porosity
structure
numerical modeling
porowatość
struktura
modelowanie numeryczne
Opis:
A numerical algorithm is presented for the filling process of a cylindrical column with equilateral cylinders. The process is based on simplified mechanics – the elements are added one by one until the mechanical equilibrium is reached. The final structure is examined with respect to the global and local porosity distribution. Oscillating radial porosity profile is obtained in accordance with experimental data.
Źródło:
Chemical and Process Engineering; 2013, 34, 3; 347-359
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Confined fluidization of fines in fixed bed of coarse particles
Autorzy:
Buczek, B.
Zabierowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/184981.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fluidization
confined fluidised bed
hydrodynamic
fluidyzacja
złoże fluidalne
Opis:
Experiments on a confined fluidized bed system with various shapes of particles have been presented in the paper. Its influence on hydrodynamic properties in the whole range of gas velocity has been analysed. Relations allowing calculation of the Richardson-Zaki-type equation coefficients, including description of inter-particle void and gas pressure drop in such systems have been determined. Necessary condition for confined fluidization of non-spherical coarse particles has also been determined.
Źródło:
Chemical and Process Engineering; 2016, 37, 4; 545-557
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of NO adsorption in fixed bed on activated carbon
Autorzy:
Kubonova, L.
Obalova, L.
Vlach, O.
Troppova, I.
Kalousek, J.
Powiązania:
https://bibliotekanauki.pl/articles/185602.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adsorpcja
współczynnik przenikania
adsorption
activated carbon
nitric oxide
linear driving force model
mass transfer coefficient
Opis:
Adsorption experiments of nitric oxide in nitrogen carrier gas were held on activated carbon in a fixed bed flow system. Breakthrough curves describing the dependence of exit concentrations of nitric oxide on time were matched with theoretical response curves calculated from the linear driving force model (LDF). The model assumes Langmuir adsorption isotherm for the description of non-linear equilibrium and overall mass transfer coefficient for mass transfer mechanism. Overall mass transfer coefficients were obtained by the method of least squares for fitting numerically modelled breakthrough curves with experimental breakthrough curves. It was found that LDF model fits all the breakthrough curves and it is a useful tool for modelling purposes.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 367-377
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic studies of micron zinc particle hydrolysis in a fixed bed reactor
Autorzy:
Lv, M.
Liu, H.
Nie, X.
Ashraf, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/260562.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrogen
zinc hydrolysis
thermal chemistry
fixed bed
Opis:
Zinc fuel is considered as a kind of promising energy sources for marine propeller. As one of the key steps for zinc marine energy power system, zinc hydrolysis process had been studied experimentally in a fixed bed reactor. In this study, we focus on the characteristics of micron zinc particle hydrolysis. The experimental results suggested that the steam inner diffusion is the controlling step of accumulative zinc particles hydrolysis reaction at a relative lower temperature and a relative higher water partial pressure. In other conditions, the chemical reaction kinetics was the controlling step. And two kinds of chemical reaction kinetics appeared in experiments: the surface reaction and the gas-gas reaction. The latter one occurs usually for larger zinc particles and high reaction temperature. Temperature seems to be one of the most important parameters for the dividing of different reaction mechanisms. Several parameters of the hydrolysis process including heating rate, water partial pressure, the particle size and temperature were also studied in this paper. Results show that the initial reaction temperature of zinc hydrolysis in fixed bed is about 410 oC. And the initial reaction temperature increases as the heating rate increases and as the water partial pressure decreases. The total hydrogen yield increases as the heating rate decreases, as the water partial pressure increases, as the zinc particle size decreases, and as the reaction temperature increases. A hydrogen yield of more than 81.5% was obtained in the fixed bed experiments.
Źródło:
Polish Maritime Research; 2015, S 1; 112-120
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of downdraft and updraft gasification of biomass in a fixed bed reactor
Autorzy:
Kluska, J.
Ochnio, M.
Kazimierski, P.
Kardaś, D.
Powiązania:
https://bibliotekanauki.pl/articles/240106.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gasification
biomass
thermochemical conversion
gazyfikacja
biomasa
termochemiczna konwersja
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.
Źródło:
Archives of Thermodynamics; 2018, 39, 4; 59--69
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fixed-bed adsorptive removal of metanil yellow from simulated wastewater in a fixed-bed column by nitric acid-treated-H3PO4-activated carbon (NATPAAC) from oil palm fruit mesocarpfibre
Autorzy:
Isiuku, B. O.
Ojike, C. A.
Akakuru, O. U.
Ibe, F. C.
Powiązania:
https://bibliotekanauki.pl/articles/1112874.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adsorption capacity
activated carbon
fixed-bed column
kinetic models
metanil yellow
Opis:
We carried out fixed-bed column adsorption of metanil yellow from simulated wastewater on NATPAAC derived from oil palm fruit mesocarpfibre so as to determine the adsorption capacity, qe, of the carbon under the effects of inlet concentration, Co, carbon bed height, H and dye solution flow rate, Q. Our results indicate that the optimum qe was 15.982 mg/g by Co 25 mg/L, H 4.1cm and Q 8 mL/min. In the study, qe was observed to decrease with increase in Co and Q. The optimum bed height was 4.1cm. Our experimental data were modelled by applying Thomas and Yoon-Nelson kinetic models. Correlation coefficient, R2 values (generally above 0.85) show that the two kinetic approaches provide an effective model of the experimental data. We conclude that oil palm fruit mesocarpfibre has potential as a precursor for production of carbon for acid-dye removal from wastewater.
Źródło:
World News of Natural Sciences; 2018, 17; 157-172
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fixed Bed System Packed with Porous Materials for Removal of Organic Dye from Wastewater
Autorzy:
Cho, Young-Sang
Sung, Sohyeon
Powiązania:
https://bibliotekanauki.pl/articles/2203706.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
porous particles
photocatalyst
adsorbent
fixed bed
Opis:
Fixed beds were adopted for removal of organic dye from water by photocatalytic decomposition or adsorption. To this end, macroporous titania or silica micro-particles were synthesized from emulsions as micro-reactors and packed in the bed. During feeding aqueous methylene blue solution, UV light was irradiated for generation of active radicals for removal of dye by photocatalytic decomposition. Porous silica particles were also used as adsorbents in the bed for continuous adsorption of organic dye. For regeneration of the porous titania or silica particles, rinsing with fresh water was carried out before repeated cycles.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 51--56
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactivity of chars gasified in a fixed bed reactor with the potential utilization of excess process heat
Autorzy:
Cempa, M.
Smoliński, A.
Powiązania:
https://bibliotekanauki.pl/articles/92069.pdf
Data publikacji:
2017
Wydawca:
Główny Instytut Górnictwa
Tematy:
coal gasification
reactivity
TGA
PCA analysis
zgazowanie węgla
reaktywność
analiza PCA
Opis:
The aim of the work presented in this paper was to determine the reactivity of chars and their selection for further research purposes concerning coal gasification processes with the utilization of process excess heat. Char reactivity can be defined as the ability of coal to react with such reactants as steam, oxygen or carbon dioxide. Reactivity determines reaction rates and therefore it is a decisive factor relating to the efficiency of combustion and gasification processes. In light of the above, reactivity may be regarded as an important parameter to be considered in the design and operation of the industrial systems of coal processing. The experimental work was conducted by means of a thermogravimetric analyzer (TGA) at temperature ranges of 700, 800 and 900 °C, with oxygen as a gasifying agent. The parameters of maximum reactivity Rmax as well as of 50% of the conversion reactivity R50 were calculated. The times tmax and t50 necessary for attaining the maximum reactivity Rmax and 50% conversion reactivity R50 were also determined. The correlation between the experimentally determined values of Rmax, R50, tmax and t50,additionally the physico-chemical parameters of the coals were examined by means of PCA analysis.
Źródło:
Journal of Sustainable Mining; 2017, 16, 4; 156-161
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbonaceous materials in petrochemical wastewater before and after treatment in an aerated submerged fixed-bed biofilm reactor
Autorzy:
Trojanowicz, K.
Wojcik, W.
Powiązania:
https://bibliotekanauki.pl/articles/185052.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Chemical Oxygen Demand fractions
petrochemical wastewater
biofilm reactor
zapotrzebowanie tlenu
petrochemiczne ścieki
reaktor
Opis:
Results of the studies for determining fractions of organic contaminants in a pretreated petrochemical wastewater flowing into a pilot Aerated Submerged Fixed-Bed Biofilm Reactor (ASFBBR) are presented and discussed. The method of chemical oxygen demand (COD) fractionation consisted of physical tests and biological assays. It was found that the main part of the total COD in the petrochemical, pretreated wastewater was soluble organic substance with average value of 57.6%. The fractions of particulate and colloidal organic matter were found to be 31.8% and 10.6%, respectively. About 40% of COD in the influent was determined as readily biodegradable COD. The inert fraction of the soluble organic matter in the petrochemical wastewater constituted about 60% of the influent colloidal and soluble COD. Determination of degree of hydrolysis (DH) of the colloidal fraction of COD was also included in the paper. The estimated value of DH was about 62%. Values of the assayed COD fractions were compared with the same parameters obtained for municipal wastewater by other authors.
Źródło:
Chemical and Process Engineering; 2016, 37, 3; 373-382
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sterowanie pracą kotłów węglowych z warstwą stałą
Control of the combustion process in fixed bed coal fired boilers
Autorzy:
Chabiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/109281.pdf
Data publikacji:
2013
Wydawca:
AXIS MEDIA
Tematy:
kocioł węglowy
sterowanie pracą kotła
algorytmy sterowania
warstwa stała
spaliny kotłowe
moc kotła
emisja zanieczyszczeń
coal boiler
boiler control
control algorithms
solid layer
exhaust gas boiler
power boiler
emissions
Opis:
Właściwe sterowanie pracą kotła opalanego węglem jest zadaniem stosunkowo trudnym, w porównaniu do procesu sterowania kotłami na paliwa płynne. Szczególnie trudne jest sterowanie pracą kotła pracującego na potrzeby ciepłownicze, wymagające częstych i znacznych zmian mocy cieplnej. Autorzy niniejszego artykułu postawili sobie za cel eksperymentalne przebadanie kilku algorytmów sterowania wykorzystujących sygnały pomiarowe z czujnika tlenu w spalinach, temperatury spalin oraz mocy kotła. Wpływ sposobu sterowania na sprawność oraz emisję zanieczyszczeń, badano w przypadku kotłów o mocy 25 kW oraz 1,4 MW.
Controlling combustion process in coal fired boilers is much more difficult than in liquid fueled units. It is even more difficult in boilers connected to central heating systems where heat output changes significantly during the working period. Authors of this paper examined possibility of using excess air ratio, temperature and heat out-put signals to control coal combustion process in 25 kW and 1,4 MW boiler. Influence of control algorithm on efficiency and emission was examined.
Źródło:
Piece Przemysłowe & Kotły; 2013, 9-10; 20-23
2082-9833
Pojawia się w:
Piece Przemysłowe & Kotły
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 39

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