Influence of solids outlets and the gas inlet design on the generation of a gas-solids rotating fluidized bed in a vortex chamber for different types of particles

2017 ◽  
Vol 173 ◽  
pp. 74-90 ◽  
Author(s):  
Waldo Rosales Trujillo ◽  
Juray De Wilde
Keyword(s):  
Fluidized Bed ◽  
Vortex Chamber ◽  
Different Types

scholarly journals Application of image processing on struvite recovery from swine wastewater by using the fluidized bed

2017 ◽  
Vol 77 (1) ◽  
pp. 159-166 ◽  
Author(s):  
Zhi-Long Ye ◽  
Yujun Deng ◽  
Xin Ye ◽  
Yaoyin Lou ◽  
Shaohua Chen
Keyword(s):  
Image Processing ◽  
Particle Size ◽  
Fluidized Bed ◽  
Swine Wastewater ◽  
Granulation Process ◽  
Large Particles ◽  
Different Types ◽  
The Common ◽  
Mass Increase ◽  
Coating Growth

Abstract Fluidized granulation is one of the common methods used in wastewater treatment and resource recovery with harvesting millimeter-scale large particles. Presently, effective methods are lacking to measure the fluidized granules ranging from micro- to millimeter scales, with the consequence of ineffectively controlling and optimizing the granulation process. In this work, recovering struvite (MgNH4PO4·6H2O) from swine wastewater by using a fluidized bed was taken as an example. Image processing was applied to analyze the properties of different types of struvite granules, including morphology, particle size distribution, number density and mass concentration. Four stages of the struvite crystal evolution were therefore defined: aggregation, aggregate compaction, cluster-agglomerating and coating growth. These stages could occur simultaneously or sequentially. Up-flow rates of 30–80 mm/s in the fluidized bed sustained 600–876 g/L granular solids. Results revealed that the coating-growth granules were formed with compact aggregates or cluster-agglomerating granules as the nuclei. The growth rates for the different types of particles, including population growth, mass increase and particle size enlargement, were determined. In final, a schematic illustration for struvite granulation process is also presented.

Long-Term Experience of Running Operation Boilers Equipped with Furnace Working upon High-Temperature Circulating Fluidized Bed

2015 ◽  
Vol 792 ◽  
pp. 345-350
Author(s):  
Andrey Lesnykh ◽  
Sergey Golovatiy ◽  
Danil Valovik
Keyword(s):  
High Temperature ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
High Temperature Furnace ◽  
Different Types ◽  
Operational Tests ◽  
Adjustment System ◽  
Long Term Experience ◽  
Temperature Furnace

The boiler KE-10-14 reconstructed under high-temperature furnace circulation fluidized bed has been considered. Features of the boiler with a high-temperature furnace circulation fluidized bed have been presented. The characteristics of the boiler and problem of its operation for the whole period of operation have been shown. Recommendations for improving the efficiency of boiler have been developed on the basis of conducted operational tests. The results of adjustment system sectional blast have been presented. The characteristics of the boiler on different types of coal have been compared. The application of HTCFB furnace as well as carry out commissioning activities has made it possible to increase the effectiveness of the KE-10-14 boiler.

Alternating electric field fluidized bed disinfection performance with different types of granular activated carbon

2014 ◽  
Vol 132 ◽  
pp. 70-76 ◽  
Author(s):  
Justina Racyte ◽  
Doekle R. Yntema ◽  
Laura Kazlauskaite ◽  
Anne-Claire Dubois ◽  
Harry Bruning ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electric Field ◽  
Fluidized Bed ◽  
Granular Activated Carbon ◽  
Alternating Electric Field ◽  
Different Types

scholarly journals THE COMPUTER SIMULATION OF THE COMBUSTION OF THE GASIFICATION PRODUCTS IN FLUIDIZED BED OF SOLID FUEL IN UPPER BED LAYER WITH VORTEX BURNING

2021 ◽  
Vol 43 (2) ◽  
pp. 77-83
Author(s):  
S.G. Kobzar ◽  
G.V. Kovalenko ◽  
A.A. Khalatov
Keyword(s):  
Fluidized Bed ◽  
Solid Fuel ◽  
Hydrogen Oxidation ◽  
Vortex Chamber ◽  
Temperature Fields ◽  
Hydrogen Oxidation Reaction ◽  
Ansys Cfx ◽  
Dissipation Model ◽  
Main Components ◽  
Gasification Products

The swirl afterburning is a promising method of improving the combustion of solid fuels. The aim of the work is to verify the ANSYS CFX software package for calculating the vortex chamber of cyclone-ball furnaces afterburning. As a result of the study it was determined that to simulate the combustion of gasification products of solid fuel in a fluidized bed in a upper bed space with vortex afterburning, it is advisable to use a two-stage mechanism of methane oxidation, supplemented by hydrogen oxidation reaction. The parameters of the Eddy Dissipation model are determined, which allow obtaining results on temperature fields and fields of concentrations of the main components with satisfactory accuracy, both qualitatively and quantitatively.

scholarly journals RESEARCH THERMAL CHARACTERISTICS OF THE PROCESS OF PYROLYSIS OF METHANE IN THE ELECTROTHERMAL FLUIDISED BED

2018 ◽  
Vol 40 (4) ◽  
pp. 83-90
Author(s):  
K.V. Simeiko
Keyword(s):  
Fluidized Bed ◽  
Experimental Studies ◽  
Thermal Characteristics ◽  
Chemical Properties ◽  
Electric Heating ◽  
Dielectric Materials ◽  
Gas Analysis ◽  
Fluidised Bed ◽  
Different Types ◽  
Methane Pyrolysis

The main products of high-temperature pyrolysis of methane are carbon and hydrogen. Due to their unique physical and chemical properties, pyrocarbon and pyrographite can be used in various industries and energy. Hydrogen is an energy-efficient and environmentally friendly energy carrier. Despite the large number of research works on methane pyrolysis, carrying out of this process in the electrothermal fluidized bed (ETFB) is not studied enough. The purpose of the study is to determine the thermophysical characteristics of the process of methane pyrolysis (the main products of the reaction are hydrogen and pyrocarbon) in reactors with different types of ETFB. The temperature of the complete disposition of methane to carbon and hydrogen is 800 K. This value is based on the thermodynamic calculations. A laboratory and a pilot plant with a different type of ETFB have been created for this process. Experimental studies of the process of methane pyrolysis had been carried out on these plants and experimental data were compared with the calculations. The method which allows to determine the amount of precipitated carbon has been developed. It is based on the gas analysis data. Nusselt's criterion for different types of reactors with ETFB has been calculated. It was showed that electrothermal heating of a fluidized bed of conductive particles is much more efficient than the external electric heating of a fluidized bed. This result is based on previous researches. It is explained by the direct influence of the plasma of microcircuits and by advantages of heat generation directly in the middle of the fluidized bed. Taking into account the obtained results and the specifics of the application of the pyrocarbon coating on dielectric materials, a scheme of a reactor with ETFB, which allows to use both external heating and classical ETFB at the same time, has been developed.

Investigation of a fluidized bed in a vortex chamber

2011 ◽  
Vol 52 (2) ◽  
pp. 206-211 ◽  
Author(s):  
N. A. Dvornikov ◽  
P. P. Belousov
Keyword(s):  
Fluidized Bed ◽  
Vortex Chamber

Production of Silicon from SiH4 in a Fluidized Bed, Operation and Results

2013 ◽  
Vol 11 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Werner O. Filtvedt ◽  
Trygve Mongstad ◽  
Arve Holt ◽  
Morten Melaaen ◽  
Hallgeir Klette
Keyword(s):  
Solar Cell ◽  
Energy Consumption ◽  
Fluidized Bed ◽  
Fluidized Bed Reactors ◽  
Promising Alternative ◽  
Energy Payback ◽  
Payback Time ◽  
Different Types ◽  
Energy Payback Time ◽  
Silicon Based

Abstract: For an installed silicon-based solar cell panel, about 40% of the energy needed for fabrication is consumed for production of the silicon feedstock. Reducing the energy consumption in this step is therefore crucial in order to minimize the energy payback time and cost of the technology. The most promising alternative to the conventional methods is to use fluidized bed reactors. In this article, we report the results from a novel reactor layout with a selectively cooled distribution arrangement. Important aspects of fludized bed monitoring and operation are described. Two different operation regimes are stated yielding hence porous and dense growth. Further, the method of encapsulating fines by means of more dense depositions is verified, and the nature of the scavenged material is characterized. Also, two different types of fines formation are identified and accounted for.

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