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 19 of 19 for “"fluid bed"”.
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Arrayed microfluidic actuation for active sorting of fluid bed particulates
Fluidic actuation offers a facile method to move large quantities of small solids, often referred to as fluid-bed movement. Applications for fluid bed processing are integral to many fields including petrochemical, petroleum, chemical, pharmaceutical, biochemical, environmental, defense, and …
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Solids mixing and segregation in a gas spout-fluid bed-effect of the distributor design
… the assessment of a newer version of the spout-fluid bed where the gas is supplied from a common plenum and the distributor controls the operational phenomenon. Thus the main body of the work deals with the effect of the distributor design on the mixing and segregation of solids in a …
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Statistically Designed Spheronization and Scale-Up of Ibuprofen Microparticulates Using the Rotor Disk Fluid-Bed Technology: Coating for Prolonged Release and Hard Gelatin Encapsulation of Microparticulates
… coated ibuprofen microparticulates in a one-step fluid-bed machine with rotor-disk insert, for immediate and prolonged drug delivery. Feasibilty studies using ibuprofen: Avicel (RC-581; 50:50), sodium lauryl sulfate (1%) as surfactant and water as binder in FLM-15 Vector Flo-coater with 12" …
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Sensitivity of methanol-to-olefin reaction to axial gas dispersion: determination in a vibrated-bed microreactor
… Pe<sub>ax</sub> agrees with earlier turbulent fluid-bed data. Loss in olefins with increase in axial gas dispersion (decrease in Pe<sub>ax</sub>) suggests that a circulating fluid bed may be the preferred reactor for this reaction. Researchers can use the microreactor to determine, quickly and …
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QUALITATIVE AND QUANTITATIVE PROCEDURE FOR UNCERTAINTY ANALYSIS IN LIFE CYCLE ASSESSMENT OF WASTEWATER SOLIDS TREATMENT PROCESSES
… performance, two alternative scenarios (fluid bed incineration and anaerobic digestion) were proposed, constructed, and evaluated. System boundaries were set to include the construction, operation and dismantling phases. The impact assessment method chosen was Eco-indicator 99 and the …
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The design, evaluation and costing of biomass gasifiers
… equilibrium model of gasification is described using the operating condition called the adiabatic carbon boundary. This represents an ideal gasifier working at the point where the carbon in the feedstock is completely gasified. The model can be used as a `target' against which the results of …
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Optical measurement of ash particle size and velocity in gas-solid flow
… particle separation in a simulated Circulating Fluid Bed (CFB) riser system. The experimental results demonstrate the effectiveness of the prototype system for on-line measurement of particle size and velocity distribution.
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Application of First Principle Modeling in Combination with Empirical Design of Experiments and Real-Time Data Management for the Automated Control of Pharmaceutical Unit Operations
… ample incentive for the expense. </p><p>The fluid bed granulation and drying unit operation was an excellent case study for control systems implementation because it is a complex unit operation with dynamic powder movement, high energy input, solid-liquid-gas interactions, and difficulty with …
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ΠΥΡΟΛΥΣΗ ΕΛΛΗΝΙΚΟΥ ΛΙΓΝΙΤΗ
THIS WORK CONCERNS GREEK LIGNITE PYROLYSIS IN A FLUID BED REACTOR AND IN NITROGEN ATMOSPHERE. THE EXPERIMENTAL SYSTEM HAS SOME ADVANTAGES: HIGH HEATING RATES,REAL ISOTHERMAL CONDITIONS AND ON-LINE MEASUREMENTS OF TOTAL GASES AND HYDROCARBONS PRODUCED DURING PYROLYSIS. IN THIS WORK THE INFLUENCE OF …
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The suitability of coal gasification in India's energy sector
… manufacturing company (BHEL) is developing a fluid-bed gasifier designed for Indian coals, but has not yet demonstrated it at a size larger than 6 MW. Outside of BHEL, there are many factors holding this technology back. First, the technology is projected to be more expensive than pulverized …
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The Production of Activated Carbon from North Dakota Lignite
… producing activated carbon from lignite using a fluid bed reactor was investigated. Steam was used as the activating agent and was- reacted with carbonized lignite at elevated temperatures. The reaction was performed in a fluidized bed type reactor 1 l/2" in diameter and 24" in …
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Combustion of Coal in Shallow Fluidised Beds
… information, which may enable coalfired shallow fluidized bed combustors to be designed with greater assurance, have been presented in this thesis. The mechanism of combustion of a single coal particle in a fluidized bed is studied. Experimental observations and published data suggest that carbon …
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Cold model of a vibrated-bed microreactor capable of varying Peclet number at fixed weight hourly space velocity providing a tool for simulating an important feature of the reaction kinetic scene in large catalytic fluid beds
A cold-flow model of a vibrated-bed microreactor has been designed and tested with capability for varying the level of gas dispersion (characterized by axial Peclet number) at a fixed weight hourly space velocity (WHSV). A tool has thus been provided whereby an important feature (viz., gas …
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Fast pyrolysis of biomass in a circulating fluidised bed reactor
… construct, 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 …
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Development of a microreactor system for unsteady-state Fischer- Tropsch synthesis
Vibrofluidized microreactor systems have been developed for studies of unsteady-state Fischer-Tropsch synthesis. This development is aimed at preventing carbon deposition on a fused-iron catalyst in a novel reactor called the “heat-tray.” This reactor involves a supernatant gas flowing over a …
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Gas distribution in shallow packed beds
Packed beds have many industrial applications and are increasingly used in the process industries due to their low pressure drop. With the introduction of more efficient packings, novel packing materials (i.e. adsorbents) and new applications (i.e. flue gas desulphurisation); the aspect ratio …
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Agglomeration of Bed Particles in Low-Temperature Black Liquor Gasification
… and used as a fuel in recovery boilers and fluidized bed steam reformers. Recovery boilers have a low efficiency and are used today because of their reliability. Steam reformers have a much higher efficiency but they are a relatively new science and are not as reliable. One of the reasons …
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Structural changes and dynamic behaviour of vanadium oxide-based catalysts for gas-phase selective oxidations
… for n-butane oxidation to maleic anhydride (fluid bed technology) and for o-xylene oxidation to phthalic anhydride. Both reactions are catalyzed by systems based on vanadium, but catalysts are completely different. Part A is dedicated to the study of V/P/O catalyst for n-butane selective …