scholarly journals Experimental Investigations Into Bubble Characteristics in a Fluidized Bed Through Electrostatic Imaging

2021 ◽  
Vol 70 ◽  
pp. 1-13
Author(s):  
Bojian Qi ◽  
Yong Yan ◽  
Wenbiao Zhang ◽  
Xinyan Li
Keyword(s):  
Fluidized Bed ◽  
Experimental Investigations ◽  
Electrostatic Imaging ◽  
Bubble Characteristics

Investigation of Flow Behaviors and Bubble Characteristics of a Pulse Fluidized Bed via CFD Modeling

2009 ◽  
Vol 28 (1) ◽  
pp. 78-93 ◽  
Author(s):  
Zhanyong Li ◽  
Weiguang Su ◽  
Zhonghua Wu ◽  
Ruifang Wang ◽  
A. S. Mujumdar
Keyword(s):  
Fluidized Bed ◽  
Cfd Modeling ◽  
Bubble Characteristics

The Effect of Coal Type on Thermal Balance in a Dense Phase of a Circulating Fluidized Bed Combustor

2003 ◽  
Author(s):  
Mirko S. Komatina ◽  
Xin Liu ◽  
Franz Winter
Keyword(s):  
Fluidized Bed ◽  
Coal Batch ◽  
Circulating Fluidized Bed ◽  
Temperature Drop ◽  
Thermal Balance ◽  
Experimental Investigations ◽  
Volatile Content ◽  
Dense Phase ◽  
Fluidized Bed Combustor ◽  
Coal Type

The results of experimental investigations of the effect of coal type on the thermal balance during early stages in a dense phase of a circulating fluidized bed combustor (CFBC) are presented in this paper. The experimental investigations were performed in a laboratory-scale CFBC. Five coals with three size classes (small 0.5–0.63 mm, medium 2–3.1 mm, and large 7.1–8 mm) were tested. The electrical heating system was used to ensure that the riser has a constant temperature (850°C) before the experiments. Mean velocity was 1.2 m/s. Oxygen concentration was 5%. During the experiments the temperature in the dense phase in the lower part of the riser and the gas concentrations of CO and CO2 were measured continuously. On the temperature histories measured, it can be seen that after feeding the coal batch into the hot CFBC, the temperature in the dense phase decreases, after reaching a minimum value and increases back again. The experimental results were compared to each other on the basis of the maximum temperature drop after feeding the coal batch. It was concluded that the temperature drop depends slightly on coal size and mainly on coal type and its mechanical and physical structure. The temperature drop slightly increases when the particle size of the coal batch increases. The strongest influence on the temperature drop in the dense phase of the CFBC shows the volatile content of the original coal and the temperature drop is directly proportional to the volatile content.

scholarly journals Bubble Characteristics in a Pulsated Fluidized Bed under Intermittent Fluidization.

2000 ◽  
Vol 26 (1) ◽  
pp. 88-93 ◽  
Author(s):  
AKIRA NISHIMURA ◽  
SEIICHI DEGUCHI ◽  
HITOKI MATSUDA ◽  
MASANOBU HASATANI ◽  
Arun Mujumdar
Keyword(s):  
Fluidized Bed ◽  
Bubble Characteristics

The Indirectly Heated Carbonate Looping Process for CO2 Capture—A Concept With Heat Pipe Heat Exchanger

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Daniel Hoeftberger ◽  
Juergen Karl
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Power Plants ◽  
Batch Reactor ◽  
Heat Pipes ◽  
Experimental Investigations ◽  
Transfer Coefficients ◽  
Carbonation Reaction ◽  
Heat Transfer Coefficients ◽  
Bubbling Fluidized Bed

The carbonate looping process using the reversible calcination/carbonation reaction of limestone is a promising way to reduce CO2 emissions of fossil fired power plants. This paper describes the concept of an indirectly heated version of this process in which heat pipes accomplish the heat transfer from an air-blown fluidized bed combustor to a bubbling fluidized bed calciner. It defines the calciner's specific heat demand which is a pendant to the heating value of coal. The dimensioning depends on the processes inside heat pipes as well as heat transfer of immersed heating surfaces. Experimental investigations in an electrically heated batch reactor with a similar pipe grid provide heat transfer coefficients under calcination conditions.

Experimental Investigation on Flow Patterns of Cylindrical-Conical Spout-Fluidizing Bed

2011 ◽  
Vol 354-355 ◽  
pp. 338-343
Author(s):  
Qian Jun Li ◽  
Dong Ping Zhang
Keyword(s):  
Flow Pattern ◽  
Fluidized Bed ◽  
Fixed Bed ◽  
Ccd Camera ◽  
Flow Patterns ◽  
Operating Conditions ◽  
Hydrodynamic Characteristics ◽  
Experimental Investigations ◽  
Bed Height ◽  
Bed Materials

Experimental investigations on hydrodynamic characteristics of cylindrical pressurized spout-fluidizing bed were carried out. Two kinds of millet were used as bed materials. The operational pressure is 0.1MPa~0.4MPa (absolutely pressure). Five distinct flow patterns, i.e, fixed bed(FB), jet in fluidized bed with bubbles(JFB), jet in fluidized bed with slugging(JFS), spout with aeration(SA) and spout-fluidizing bed(SF) were identified. Effects of the static bed height and operational pressure on the flow pattern map were particularly studied. Typical flow pattern images obtained by a high- resolution digital CCD camera were presented for classifying these flow patterns. Typical flow pattern maps were plotted for describing the transitions between flow patterns with operating conditions

scholarly journals MODELING AND CALCULATION OF GRINDING AND CLASSIFICATION OF MIXTURE OF DISSIMILAR COMPONENTS IN CLOSED MILLING CIRCUIT

2019 ◽  
Vol 62 (9) ◽  
pp. 102-109
Author(s):  
Vladimir P. Zhukov ◽  
Dmitriy А. Osipov ◽  
Vadim E. Mizonov ◽  
Tomasz Wyleciał
Keyword(s):  
Boltzmann Equation ◽  
Fluidized Bed ◽  
Discrete Models ◽  
Experimental Investigations ◽  
Engineering Practice ◽  
Actual Problem ◽  
The Boltzmann Equation ◽  
Particulate Solids ◽  
The Impact

It is shown that the developed earlier model of joint grinding of dissimilar particulate solids based on the discrete models of the Boltzmann equation does not take into account the possible size and density classification of particles and the operating of technological equipment in a closed milling circuit. It is substantiated that the problem of improving the efficiency of separation of mixture components, based on the analysis of their treatment in a closed milling circuit is an actual problem in the field. Theoretical investigations were based on the discrete models of the Boltzmann equation and the methods of their solution related to the technology of treatment of dissimilar components mixture. A special program for measurements and experimental data treatment obtained at the laboratory fluidized bed jet mill and the impact mill was developed for the experimental investigations. In the course of computational and experimental study a mathematical model of classification of dissimilar components was proposed and tested as well as the algorithm of its implementation into the general model of a closed milling circuit. The computational investigations were carried out to estimate the model sensitivity to the input parameters disturbance.  The directions of improving the efficiency of the objective component separation in the closed milling circuit with the fluidized bed jet mill are found. The developed model the closed milling circuit for grinding dissimilar particulate solids can be used in engineering practice with acceptable accuracy. It can be used to estimate the possible enrichment of particulate solids mixtures and to define the optimal technological conditions of their separation with taking into account the limitations on the objective product impurity. The paths are outlined and the order of selection of the parameters of the grinding processes and the classification for effective separation of the components of the mixture are shown.

Experimental investigations in a demonstration plant for fluidized bed gasification of multiple feedstock’s in 0.5 MW th scale

Fuel ◽  
2017 ◽  
Vol 205 ◽  
pp. 286-296 ◽  
Author(s):  
Philipp Herdel ◽  
David Krause ◽  
Jens Peters ◽  
Brigga Kolmorgen ◽  
Jochen Ströhle ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Experimental Investigations ◽  
Demonstration Plant
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