Temat: stirred - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Studies on the effect of coal particle size on biodepyritization of high sulfur coal in batch bioreactor
Autorzy:: Singh, S.
Srichandan, H.
Pathak, A.
Gahan, Ch. S.
Lee, S.
Kim, D. J.
Kim, B. G.
Tematy:: biodepyritization
coal
pyrite
stirred tank bioreactor; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/778523.pdf Link otwiera się w nowym oknie
Opis:: The moderate thermophilic mix culture bacteria were used to depyritize the Illinois coal of varying particle sizes (-100 μm, 100-200 μm, +200 μm). Mineral libration analysis showed the presence of pyrite along with other minerals in coal. Microbial depyritization of coal was carried out in stirred tank batch reactors in presence of an iron-free 9K medium. The results indicate that microbial depyritization of coal using moderate thermophiles is an efficient process. Moreover, particle size of coal is an important parameter which affects the efficiency of microbial depyritization process. At the end of the experiment, a maximum of 75% pyrite and 66% of pyritic sulphur were removed from the median particle size. The XRD analysis showed the absence of pyrite mineral in the treated coal sample. A good mass balance was also obtained with net loss of mass ranging from 5-9% showing the feasibility of the process for large scale applications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of two-stage stirred pulp-mixing on coal flotation
Autorzy:: Gui, X.
Wang, Y.
Zhang, H.
Li, S.
Tematy:: mixing
stirred
two stage
fine coal
flotation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110764.pdf Link otwiera się w nowym oknie
Opis:: Stirred pulp-mixing is performed before coal flotation. In this study, a two-stage stirred pulpmixing tank was designed based on the single-stirred process to intensify the mixing effect of pulp and flotation reagents. A tank has a pitched-impeller opening-type turbine. Stirred pulp-mixing and flotation experiments were conducted on a sample of anthracite fine coal (-0.5mm) from the Xuehu Coal Preparation Plant in Henan Province, China. The results of the two-stage stirred pulp-mixing were compared with those of a single-stage stirred pulp-mixing in terms of flotation performance. Compared with the single-stage stirred pulp-mixing, two mixing areas and double-layer impeller were able to strengthen the energy input to the stirred system, thereby improving the mixing efficiency of flotation reagents and coal particles in the pulp. The two-stage stirred pulp-mixing significantly increased the flotation feed rate of the cyclone-static micro-bubble flotation column and concentrate yield, enhanced the combustible matter recovery effect of coarse particles at a suitable flotation feed rate, and ensured the recovery effect of fine particles at high flotation feed rate.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The effect of liquid grinding aids on the dry fine grinding of muscovite
Autorzy:: Cayirli, Serkan
Gokcen, Hasan Serkan
Bozkurt, Volkan
Ucbas, Yasar
Tematy:: grinding aid
dry grinding
stirred ball mill
muscovite; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/24085945.pdf Link otwiera się w nowym oknie
Opis:: This paper investigates the production of a micronized muscovite to a target product size of d50~15 μm with a minimum energy consumption to suit the product requirements of the paint industry by a dry grinding process in a laboratory-scale vertical stirred ball mill. A series of batch dry grinding tests were conducted without and with two commonly used industrial liquid grinding aids, ethylene glycol (EG, C2H6O2) and triethanolamine (TEA, C6H15NO3). The results were evaluated based on particle size distribution (PSD), specific energy consumption, span value, and aspect ratio. The results showed that using liquid grinding aids resulted in a finer PSD, lower specific energy consumption, a narrower size distribution, lower span values, and a higher aspect ratio, which meant better delamination and improved grinding efficiency to that of no grinding aid. The interaction between grinding aids and ground muscovite surfaces was investigated by Fourier Transform Infrared Spectroscopy (FTIR). FTIR measurements revealed that EG and TEA were physically adsorbed on muscovite surfaces. Scanning Electron Microscopy (SEM) was also employed to determine differences between ground muscovite surfaces with and without grinding aids. SEM images indicated that grinding aids could prevent the agglomeration of ground muscovite particles while improving delamination. Adding grinding aids led to a decrease in muscovite agglomeration and an improvement in lamination owing to the adsorption of grinding aids on the particle surfaces.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Technological and economical investigation of glaze preparation using dry stirred media mill
Autorzy:: Ergin, Hasan
Yıldırım, Yıldız
Çırpın, Arife
Turgut, Hatice
Kayacı, Kağan
Tematy:: ceramic tile
glaze preparation
grinding
stirred media mill; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/24085604.pdf Link otwiera się w nowym oknie
Opis:: Ceramic tiles are the most common building material for floor and wall coverings in many countries. Glazed tiles are produced from mixture of frits and some additional raw materials applied on the surface of green tiles and subjected to a firing process. A new method of processing of glaze that is dry stirred media mill was investigated in a pilot grinding plant. The produced glaze particle size, shape and surface area are measured. The comparison was made with the product of conventional wet discontinue ball mills using the same wall tile glaze recipes. The results indicated that dry stirred media mill can provide product that have finer particle size distribution, more stable product compared to the conventional wet ball milling. The glaze thermal expansion and optical properties such as colour (L, a and b parameters) of the produced glazes were measured and comparison was also made in details. Finally, the microstructural characteristics of the produced glazes were determined using scanning electron microscopy (SEM). The results have shown that dry stirred media mill enhances glaze properties and process economy considerably.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: CFD analysis of mixing intensity in jet stirred reactors
Autorzy:: Gil, I.
Mocek, P.
Tematy:: kinetyka
CFD
jet stirred reactor
kinetic
reaction design; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/185797.pdf Link otwiera się w nowym oknie
Opis:: The homogeneous stirred reactor designed for kinetic studies of the combustion of hydrocarbons with intensive internal recirculation in high temperature combustion chamber is described. The originality of our reactor lies in its construction which allows to intensively mix fuel and flue gases, measure gas temperature as well as obtain samples which can be used to investigate diffusion flames. The cylindrical construction enables to use the reactor in laboratory cylindrical electrically heated ovens. The CFD analysis of the reactors, the mixing parameters (turbulent Peclet number and mixing level) and the volume average temperature in the reactors were elaborated on the basis of the typical dimensions of classical reactors to kinetics research as well as the own reactor design. The results of the analysis allow to reveal advantages of our construction.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analiza wyników modelowania numerycznego i badań doświadczalnych hydrodynamiki przepływu cieczy w mieszalniku
Analysis of numerical modeling results and experimental investigations into liquid flow hydrodynamics in a stirred vessel
Autorzy:: Talaga, J.
Wójtowicz, R.
Tematy:: modelowanie CFD
mieszalnik mechaniczny
LDA
CFD simulations
mechanically stirred vessel; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2071107.pdf Link otwiera się w nowym oknie
Opis:: W pracy porównano wyniki modelowania numerycznego CFD i badań doświadczalnych hydrodynamiki przepływu cieczy w mieszalniku mechanicznym. Badania prowadzono dla dwóch mieszadeł turbinowych generujących różne cyrkulacje cieczy w aparacie. Obserwowano charakter zmian parametrów opisujących przepływ cieczy (składowych prędkości, energii kinetycznej turbulencji i dyssypacji energii), porównując wyniki ilościowe uzyskane metodą symulacj i numerycznych z wynikami badań doświadczalnych.
Analysis of numerical modeling results and experimental investigations into liquid flow hydrodynamics in a mechanically stirred vessel is presented in the paper. Investigations were carried out for two turbine impellers generating different flow circulation in the mixing vessel. Changes of liquid flow parameters (velocity components, turbulence kinetic energy and turbulence dissipation rate) were observed and the quantitative results of numerical simulation and experimental data were compared.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Gas hold-up analysis in an unsteady stirred vessel by means of infinite series
Autorzy:: Frankiewicz, Sebastian S.
Woziwodzki, Szymon
Tematy:: unsteady mixing
gas hold-up
non-coalescing system
stirred vessel; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/27315623.pdf Link otwiera się w nowym oknie
Opis:: The use of a liquid level sensor made it possible to measure changes in gas hold-up over time in a stirred tank during unsteady mixing. These results were subjected to Fourier time series analysis and a model of gas hold-up changes in time was proposed. It allowed one to determine the model value of gas hold-up, which can be useful for characterizing gas hold-up during unsteady mixing and as a comparison to gas hold-up during steady mixing. The characteristic frequency was also determined, which corresponds to about twice the oscillation frequency. Model gas hold-up values for coalescing and non-coalescing systems were compared. Moreover, the change of the gas hold-up at constant maximum stirrer rotation frequency and variable gas flow rate for different oscillation frequencies was investigated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Study of the effect of geometric shape on the quality of mixing: Examining the effect of length of the baffles
Autorzy:: Bouchouicha, Malika Seddik
Laidoudi, Houssem
Hassouni, Souad
Makinde, Oluwole Daniel
Tematy:: baffles
stirred vessel
non-newtonian fluid
steady simulation
CFD; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/27312229.pdf Link otwiera się w nowym oknie
Opis:: This work is an attempt to study the behaviour of fluid in the mixing vessel with a two-bladed or four-bladed impeller. The working fluid is complex, of a shear-thinning type and the Oswald model is used to describe the fluid viscosity. The study was accomplishedby numerically solving the governing equations of momentum and continuity. These equations were solved for the following range of conditions: 50–1000 for the Reynolds number, 0–0.15 for the baffle length ratio, and the number of impeller blades 2 and 4. The simulations were done for the steady state and laminar regime. The results show that the increase in baffle length (by increasing the ratio baffle length ratio) decreases the fluid velocity in the vessel. Increasing the speed of rotation of the impeller and/or increasing the number of blades improves the mixing process. Also, the length of the baffles does not affect the consumed power.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Numerical investigation of the turbulent flow generated with a radial Turbine using a converging hollow blade
Autorzy:: Beloudane, M.
Bouzit, M.
Ameur, H.
Tematy:: converging hollow
deep
radial flow
turbulent flow
stirred tank; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/778815.pdf Link otwiera się w nowym oknie
Opis:: The aim of this study is to investigate the effect of the blade shape on the characteristic of the flow patterns in a stirred tank. A new impeller blade design has been proposed. It is characterized by a converging hollow. The investigations of the flow structure generated in the vessel are made by using the computer code ANSYS CFX (version 16.0). The analysis has shown that the converging hollow blade yields highly radial flows which gave an increase in the radial velocity by 35% with less power consumption than the flat blade. Also, the effectiveness of the energy dissipation and the quality of mixing has been obviously noted. A validation test of our predicted results with other literature data was done, and a satisfactory agreement has been found.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Badania prędkości przepływu w strumieniu wylotowym cieczy dla mieszadła turbinowego tarczowego
Investigation of velocity profiles in impeller discharge stream for the Rushton turbine
Autorzy:: Talaga, J.
Tematy:: mieszanie
mieszalnik
rozkład prędkości
LDA
mixing
stirred tank
velocity profile; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2071456.pdf Link otwiera się w nowym oknie
Opis:: W pracy zaprezentowano wyniki badań rozkładu średnich prędkości przepływu w strumieniu wylotowym cieczy tłoczonej przez mieszadło turbinowe tarczowe. Pomiarów prędkości dokonano za pomocą dwukanałowego anemometru laserowego (LDA). Badania prowadzono dla dwóch różnych odległości usytuowania-mieszadla nad dnem zbiornika Wyniki badań uogólniono w postaci równań ilościowych opisujących zmiany prędkości w funkcji promienia zbiornika i wysokości łopatki mieszadła. Porównanie wyników pozwpliło na ocenę wpływu wysokości zawieszenia mieszadła nad dnem na rozkład prędkości cieczy w strumieniu wylotowym z mieszadła.
Profiles of mean velocity components in impeller discharge stream for t Rushton turbine in a mixing tank using two-component Laser Doppl Anemometry (LDA) are presented in the paper. Measurements were ps formed for two different clearances between the middle of impeller blad and the bottom of mixing vessel. An influence of radial distance and t blade height on velocity profiles was processed in a form of correlatii equations. An effect of the clearance between the impeller and vessel be tom on velocity profiles was discussed.
Dostawca treści:: Biblioteka Nauki

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