Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 56 for “"Fluidised bed"”.
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Studies on the fluidised bed granulation process.
This study is an evaluation of the process of fluidised bed granulation with the objectives of elucidating the mechanism of granule formation and identifying the fundamental parameters affecting granule quality thereby enabling the true benefits of the process to be realised. Initially the effect …
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Modelling of an industrial fluidised bed dryer
Although fluidised bed drying is often a vital operation in polymer production, it remains difficult to predict the dryer performance accurately as no general application models have been published. To investigate the coupled relationship between the operating parameters, fluidisation regimes and …
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Energy efficiency in dual fluidised bed fast pyrolysis
… Integrated Pyrolysis System (CRIPS) is a dual fluidised bed fast pyrolyser that was developed at the University of Pretoria for the conversion of biomass waste to biofuels. The dual fluidised bed design allows in situ catalytic upgrading of bio-oil, by providing the conditions required for the …
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Copper sulphide precipitation in a fluidised bed reactor
… precipitation from a copper rich stream in a fluidised bed reactor, as well as developing an understanding of the behaviour of the copper sulphide system.
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A mathematical model of coal-fired fluidised bed boilers
… model of a large coal-fired fluidized bed boiler for power generation is synthesised. The effect of variations in the main parameters of the model on variables such as the background carbon concentrations in the bed, and the transient response of heat evolution are studied. The …
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Fast pyrolysis of biomass in a circulating fluidised bed reactor
… test and operate a novel circulating fluid bed fast pyrolysis reactor system for production of liquids from biomass. The novelty lies in incorporating an integral char combustor to provide autothermal operation. A reactor design methodology was devised which correlated input parameters to …
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Distribution of bed material in a Horizontal Circulating Fluidised Bed boiler
A conventional circulating fluidised bed (CFB) boiler has a limitation due to the height of the furnace, when implemented in smaller industrial facilities. The design of a horizontal circulating fluidised bed (HCFB) boiler is an interesting approach to resolve this problem. Enabling the benefits, …
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Production and Use of Alginate Beads Containing Yeast in a Novel Fluidised Bed Bioreactor
… of Alginate Beads Containing Yeast in a Novel Fluidised Bed Bioreactor It was found experimentally that sodium alginate solutions between 1 and 6% concentration formed drops with diameters between 3 and 5 mm at a single fluid nozzle. Drop diameter was largely determined by the tube outer …
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Fluidised bed gasification of high-ash South African coals : an experimental and modelling study
… energy from coal. Coal gasification using moving bed gasifiers is one of the most important coal utilisation technologies, consuming ± 17.5% of locally produced coal. This study was motivated by the need to investigate alternative coal gasification technologies for the utilisation of fine, …
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Optimisation of Co-Firing of High Moisture Biomass with Coal in a Bubbling Fluidised Bed Combustor
… a particular view of enhancing the of coal fired fluidised bed hot gas generator (HGG) at the Cantley factory of British Sugar. It covers combustion of coal and biomass and their blends also called co-firing in a fluidised bed combustor. Particularly it focuses on the effect of introduction of …
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Process integration of cell disruption and fluidised bed adsorption of microbial enzymes: application to the retro-design of the purification of L-asparaginase
… with the capture of intracellular products by fluidised bed adsorption has been demonstrated. Pilot-scale purification of the enzyme L-asparaginase from unclarified Erwinia chrysanthemi disruptates exploiting this novel approach yielded an interim product which rivalled or bettered that …
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The behaviour of gas-emitting particles in fluidised beds
… to float or sink when introduced into gas-fluidised beds of Geldart Group B particles. This is relevant, for example, to the fluidised bed combustion of biomass, and the apparent tendency of the fuel to devolatilise predominantly near the upper surface of the bed with the attendant …
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Development of a rapid laboratory predictive test method using fluidised bed techniques for the determination of oxidisability of residual CR (III) present in slags
Slag arising from smelting in the production of ferrochrome alloys, stainless steel andPlatinum group metals (PGM) is known to contain residual chromium in variousphases within the slag matrix. Although the bulk of slag ends up on landfills, slag isused in the construction, agriculture and marine …
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Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying
… by drying/toasting in an oven. b) a continuous fluidised bed followed by drying/toasting in an oven. In high shear granulation the influence of process parameters on key granule aggregate quality attributes such as granule size distribution and textural properties of granola were investigated. …
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Investigation of Multiphase Reactor Hydrodynamics Using Magnetic Resonance Imaging
… considered: a co-current upflow gas-liquid-solid bed, a co-current downward trickle bed (gas, liquid, solid), and a gas-solid fluidised bed. These reactors were selected as they commonly demonstrate local hydrodynamic anisotropy which affects the global performance of industrial units. MRI was …
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The Investigation of Aspects of Chemical Looping Combustion in Fluidised Beds
… of chemical looping materials within traditional fluidised bed combustion and investigation of the interaction between the fuel, the supplied air and the chemical looping agent. Three topics of chemical looping combustion are discussed, including 1) the Sherwood number in the fluidised bed; 2) …
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Investigation of the conversion of fuels in the presence of solid oxygen carriers and the development of a plasma-assisted chemical looping system for H2 production
… coal-derived char was first carried out in a fluidised bed reactor in the presence of Fe2O3 or ZrO2-supported Fe2O3. CO2 was introduced to the fluidised bed, to allow the char to be gasified in situ, prior to the reaction with the oxygen carriers. The presence of Fe2O3 did not alter the …
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The post-dehydration processing and the effects on the structural modifications and functionalities of milk protein powders
… the dairy powders were firstly agglomerated by fluidised bed (FB) to investigate the effects on their rehydration processes. Then milk protein isolate powder (MPI) was used as the model system, which was agglomerated by fluidised bed and high shear mix (HS) granulators, using different liquid …
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