Temat: fluidized bed - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The influence of process parameters on combustion of plastic waste in the fluidized bed reactor
Autorzy:: Jankowski, D.
Żukowski, W.
Tematy:: plastics
fluidization
combustion
thermal decomposition
polymers
fluidized bed reactor
municipal waste
waste utilization
fluidized bed; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/778547.pdf Link otwiera się w nowym oknie
Źródło:: Polish Journal of Chemical Technology; 2013, 15, 4; 75-79
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Opis:: The paper presents the results of a research on the effects of process parameters on the combustion of waste plastics. The experiments were carried out in a laboratory fluidized bed reactor. The temperature and the conditions of the process were changed during the experiments. The plastics were combusted continuously (autothermally), periodically with extra fuel (co-firing) and alone in a hot fluidized bed. During the combustion process of materials containing nitrogen (PA, ABS), while the bed temperature decrease, changes of emissions of nitrogen oxides, in particular an increase in the concentration of N2O, up to 250 ppm at ~730°C, were observed. During ABS combustion, emission of HCN was registered, at a maximum of 400 ppm. The presence of the supporting fuel (LPG) resulted in the stabilization and acceleration of the plastic samples degradation process. The rate of thermal decomposition of waste materials depended on its elemental composition and also the physicochemical properties.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Numerical optimization of air flow in the plenum chamber of an industrial CFB boiler
Autorzy:: Mirek, P.
Jabłoński, J.
Nowak, W.
Tematy:: windbox
air distributor
circulating fluidized bed; Pokaż więcej
Data publikacji:: 2008
Powiązania:: https://bibliotekanauki.pl/articles/1943239.pdf Link otwiera się w nowym oknie
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 237-244
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Opis:: The article presents the results of experimental and numerical studies on windboxes operating in a 235MWe Circulating Fluidized Bed (CFB) boiler. The main problems of windbox designs have been identified and a modified internal geometry has been proposed which causes a more uniform flow under the grid and prevents the velocity field from formation of dead zones.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Scaling of flow phenomena in circulating fluidized bed boilers
Autorzy:: Mirek, P.
Tematy:: hydrodynamika
fluidyzacja
scaling
fluidized bed
hydrodynamics; Pokaż więcej
Data publikacji:: 2011
Powiązania:: https://bibliotekanauki.pl/articles/185439.pdf Link otwiera się w nowym oknie
Źródło:: Chemical and Process Engineering; 2011, 32, 2; 91-100
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Opis:: The paper presents an overview of scaling models used for determining hydrodynamic parameters of Circulating Fluidized Bed boilers. The governing equations and the corresponding dimensionless numbers are derived and presented for three different approaches to the scaling law of fluidized beds: classical dimensional analysis, differential equations and integrated solutions and experimental correlations. Some results obtained with these equations are presented. Finally, the capabilities and limitations of scaling experiments are discussed.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Carbon Shale Combustion in the Fluidized Bed Reactor
Autorzy:: Olek, M.
Kandefer, S.
Kaniowski, W.
Żukowski, W.
Baron, J.
Tematy:: shale coal
combustion
fluidized bed technology; Pokaż więcej
Data publikacji:: 2014
Powiązania:: https://bibliotekanauki.pl/articles/779262.pdf Link otwiera się w nowym oknie
Źródło:: Polish Journal of Chemical Technology; 2014, 16, 2; 74-76
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Opis:: The purpose of this article is to present the possibilities of coal shale combustion in furnaces with bubbling fluidized bed. Coal shale can be autothermally combusted in the fluidized bed, despite the low calorie value and high ash content of fuel. Established concentrations of CO (500 ppm) and VOC (30 mg/m3) have indicated a high conversion degree of combustible material during combustion process. Average concentrations of SO2 and NOx in the flue gas were higher than this received from the combustion of high quality hard coal, 600 ppm and 500 ppm, respectively. Optional reduction of SO2 and NOx emission may require the installation of flue gas desulphurization and de-NOx systems.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Modelling of fluidized bed biomass gasification in the quasi-equilibrium regime for preliminary performance studies of energy conversion plants
Autorzy:: Kalina, J.
Tematy:: biomasa
fluidyzacja
termodynamika
biomass
fluidized bed
thermodynamics; Pokaż więcej
Data publikacji:: 2011
Powiązania:: https://bibliotekanauki.pl/articles/185441.pdf Link otwiera się w nowym oknie
Źródło:: Chemical and Process Engineering; 2011, 32, 2; 73-89
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Opis:: Thermodynamic equilibrium-based models of gasification process are relatively simple and widely used to predict producer gas characteristics in performance studies of energy conversion plants. However, if an unconstrained calculation of equilibrium is performed, the estimations of product gas yield and heating value are too optimistic. Therefore, reasonable assumptions have to be made in order to correct the results. This paper proposes a model of the process that can be used in case of deficiency of information and unavailability of experimental data. The model is based on free energy minimization, material and energy balances of a single zone reactor. The constraint quasiequilibrium calculations are made using approximated amounts of non-equilibrium products, i.e. solid char, tar, CH4 and C2H4. The yields of these products are attributed to fuel characteristics and estimated using experimental results published in the literature. A genetic algorithm optimization technique is applied to find unknown parameters of the model that lead to the best match between modelled and experimental characteristics of the product gas. Finally, generic correlations are proposed and quality of modelling results is assessed in the aspect of its usefulness for performance studies of power generation plants.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Instalacja procesu suszenia niskotemperaturowego w złożu fluidalnym
Installation of low temperature drying process in a fluidized bed
Autorzy:: Krempski-Smejda, M.
Stawczyk, J.
Tematy:: suszenie niskotemperaturowe
złoże fluidalne
freeze-drying
fluidized bed; Pokaż więcej
Data publikacji:: 2010
Powiązania:: https://bibliotekanauki.pl/articles/2071179.pdf Link otwiera się w nowym oknie
Źródło:: Inżynieria i Aparatura Chemiczna; 2010, 4; 44-45
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Opis:: W pracy przedstawiono budowę i schemat działania instalacji do suszenia fluidyzacyjnego niskotemperaturowego pod ciśnieniem atmosferycznym. Wykonane prace modernizacyjne komory suszarniczej umożliwiły prowadzenie procesu w złożu fluidalnym, w którym stan zamrożenia zmniejsza szybkość suszenia. Ponadto zaprezentowany został system zdalnego sterowania instalacją, której głównym atutem jest możliwość pomiaru masy bez konieczności wyjmowania próbki z komory suszarniczej.
The paper describes the principle of work and construction of freeze flu-idized-bed drying under atmospheric pressure. A modernization of drying chamber enabled one to conduct the process in a fluidized bed in which freeze state is responsible for drying rate reduction. The data acquisition and control system enabled the mass change measurement without taking out a sample from the drying chamber.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: A sedimentation model for particulate suspensions in liquid–solid fluidized beds with inclined channels
Autorzy:: Li, Y.
Li, N.
Qi, X.
Zhang, W.
Zhu, R.
Tematy:: suspension
fluidized bed
fluidization
inclined channel
inclined sedimentation; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/949735.pdf Link otwiera się w nowym oknie
Źródło:: Physicochemical Problems of Mineral Processing; 2018, 54, 3; 837-846
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Opis:: The motion characteristics of mineral particles in a modified fluidized bed (mFB) with inclined plates have been studied both theoretically and experimentally. A particulate sedimentation model is built on the fluidization superficial velocity, terminal settling velocity, the device dimensions, the particle properties, and the volume fraction of the particulate suspensions in the inclined channel, which is to describe the motion behavior of particles in mono-disperse suspensions. The experimental particles are a mixture of silica and sand particles with the sizes in the range of 425 - 710 μm and 710 - 880 μm, respectively. Further, the model is extended to describe bi-disperse suspensions. The experimental system is established to be consistent with the theoretical arrangements, aiming to provide more accurate measurements. Specifically, the prediction results are in good agreement with the experimental data with the absolute deviation less than 11%. The results showed that the average solid volume fraction in the inclined channel fluctuates slightly for a given total solid inventory. The theoretical model is of certain practical significance for applications of this system to the classification, separation, and desliming of minerals.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Simulation of circulating fluidized bed gasification for characteristic study of pakistani coal
Autorzy:: Ramzan, N.
Athar, M.
Begum, S.
Ahmad, S. W.
Naveed, S.
Tematy:: ASPEN PLUS
circulating fluidized bed
coal
gasification
simulation; Pokaż więcej
Data publikacji:: 2015
Powiązania:: https://bibliotekanauki.pl/articles/779604.pdf Link otwiera się w nowym oknie
Źródło:: Polish Journal of Chemical Technology; 2015, 17, 1; 66-78
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Opis:: A process model for turbulent pressurized circulating fluidized-bed coal gasifier is created using ASPEN PLUS software. Both hydrodynamic and reaction kinetics parameter are taken into account, whose expressions for fluidized bed are adopted from the literature. Various reactor models available in ASPEN PLUS with calculator as External Block are nested to solve hydrodynamics and kinetics. Multiple operational parameters for a pilot-plant circulating fluidized-bed coal gasifier are used to demonstrate the effects on coal gasification characteristics. This paper presents detailed information regarding the simulation model, including robust analysis of the effect of stoichiometric ratio, steam to coal ratio, gasification temperature and gasification agent temperature. It is observed that, with the increase in the flow rate of air, the components hydrogen, carbon monoxide, carbon dioxide and methane reduce, which causes the Lower Heating Value (LHV) of synthesis gas (Syn. Gas) to decrease by about 29.3%, while increment in the steam flow rate shows a minute increase in heating value of only 0.8%. Stoichiometric ratio has a direct relationship to carbon conversion efficiency and carbon dioxide production. Increasing the steam to coal ratio boosts the production of hydrogen and carbon monoxide, and causes a drop in both carbon dioxide concentration and the conversion efficiency of carbon. High gasifying agent temperature is desired because of high concentration of CO and H2 &ensp, increasing carbon conversion and LHV. A high gasifying agent temperature is the major factor that affects the coal gasification to enhance H2 &enspand CO production rapidly along with other gasification characteristics.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Modeling of a Primary Air Distribution in a Plenum Chamber of the 700 MWth Circulating Fluidized Bed Boiler
Autorzy:: Mirek, Paweł
Tematy:: windbox
circulating fluidized bed boiler
fluidization
primary air; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/2201878.pdf Link otwiera się w nowym oknie
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 5; 86--99
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Opis:: The windbox is a compressed air chamber installed directly beneath the fluidized bed boiler grid and is designed to evenly distribute air across the entire cross-section of the air distributor. Due to the large volume of the plenum chambers, it is very difficult to experimentally determine the flow conditions within them. Therefore, the analysis of airflow in these devices is usually performed using computational fluid dynamics tools. The article presents the results of modeling primary air distribution in the plenum chamber of the 700 MWth circulating fluidized bed boiler operating in PGE GiEK S.A. Turów Power Plant Division. Based on the results of calculations performed using the ANSYS Fluent software, the basic problems of the design windbox geometry were identified and a method for improving the uniformity of the gas flow under the grid was proposed. As can be seen from the results obtained, the design geometry of the windbox does not provide the required uniformity of air distribution under the grid.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Nowe rozwiązanie odbioru zawiesiny z krystalizatora fluidalnego
Autorzy:: Wójcik, J.
Synowiec, P. M.
Tematy:: krystalizator fluidalny
odbiór zawiesiny
CFD
fluidized-bed crystallizer
discharge; Pokaż więcej
Data publikacji:: 2014
Powiązania:: https://bibliotekanauki.pl/articles/142595.pdf Link otwiera się w nowym oknie
Źródło:: Chemik; 2014, 68, 3; 194-197
0009-2886
Pojawia się w:: Chemik
Opis:: New Solution of Crystal Dischrge from FL Crystallizer
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "fluidized bed" wg kryterium: Temat