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Electrostatics in gas-solid fluidized beds: A review
Chemical Engineering Science, 2017Abstract Gas-solid fluidized beds, by their nature, are associated with intense and frequent collisions of solid particles with each other and with the vessel wall, causing tribo-electrification. Accumulation of electrostatic charges in fluidized bed reactors can result in severe problems such as agglomeration, wall fouling, nuisance and hazardous ...
Farzam Fotovat +2 more
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Gas-solids circulating fluidization in a packed bed
Powder Technology, 1995Abstract Gas-solid-solid circulating fluidized bed is a novel gas-solid contactor which offers interesting heat and mass transfer properties. In this type of equipment, large particles (often used as the catalyst) are fixed in the bed forming a packing section while fine powders (often used as the absorbent or heat carrier) are carried by the gas and
Xuqi Song +3 more
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Measurements of porosity of a gas-solid fluidized bed
Advanced Powder Technology, 2002Abstract Two original methods of measurements of the vertical profile of porosity in a column with a gas-solid fluidized bed, i.e. a capacitive method and an optical-pressure method, are presented in this paper. The essence of operation of each method, the results of initial measurements and comparison with results quoted in the literature have been ...
Aleksander Pabiś, Janusz Magiera
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Radiometrie Investigations into Gas-Solid-Fluidized Beds
Isotopenpraxis Isotopes in Environmental and Health Studies, 1971Investigations made into a gas-solid-fluidized bed model reactor, aiming at obtaining statements about the spatial and time density distributions within the fluidized bed and the correlation between the state of the turbulent layer and a characteristic measured quantity as well as variation of a physical property of the solid.
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A rigorous description of gas-solid fluidized beds
Chemical Engineering Science, 1996A rigorous description of gas-solid fluidized beds is presented. Our analysis focuses on studies of transport mechanisms, strategies for determining the material parameters and prediction of the process. The analysis is based on a multiphase-multicomponent continuum approach, constitutive theory and the pattern for analysis summarized in the elements ...
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Mixing and contacting in gas-solid fluidized beds
Chemical Engineering Science, 1961Abstract The two-phase model of a gas-solid fluidized bed is applied to steady-state and transient gas mixing tests. The two phases are: a dense phase consisting of particle aggregates and a dispersed phase of high vertical gas velocity. Gas and solids are exchanged continuously between the two phases by disintegration of particle aggregates and ...
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Gas–solid fluidized beds in vortex chambers
Chemical Engineering and Processing: Process Intensification, 2014This review deals with gas–solid fluidized beds in vortex chambers. High-G fluidization can be achieved in a static geometry and allows significant process intensification. Thin, dense and more uniform particle beds can be obtained at high gas–solid slip velocities, intensifying interfacial transfer of mass, heat and momentum and reducing the gas–solid
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Hydrodynamics of gas-solid turbulent fluidized beds
2009Many commercial fluidized bed processes (e.g. catalytic and gas-solid reactions, drying) operate in the turbulent fluidization flow regime owing to its excellent gas-solids contacting, favourable heat transfer, and relatively low axial dispersion of gas.
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Fluidization: Gas-solids contacting and bed expansion
Fuel, 1985Abstract In fluidization, the two phases, bubble and particulate, have vastly different velocities and moreover the proportions of these phases alter significantly with changes in fluidizing velocity. These two effects may be combined by the factor (volume flow/velocity) for each of the two phases.
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Electrostatic phenomena in gas-solids fluidized beds
China Particuology, 2005Electrostatic charges are generated by particle-wall, particle-particle and particle-gas contacts in gas-solids transport lines and fluidized bed reactors. High particle charge densities can lead to particle agglomeration, particle segregation, fouling of reactor walls and internals, leading to undesirable by-product and premature shut-down of ...
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