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 26 for “"Fluidized bed reactor"”.
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Bubbling to turbulent regime transition in a 2D catalytic fluidized bed reactor
… 2.5cmx40cmx450cm two dimensional (2D) catalytic fluidized bed reactor. Commercial FCC catalyst impregnated with Fe2O3 was used at superficial gas velocities ranging between 0.006 m/s and 0.55 m/s. The onset velocity of the turbulent regime (uc) was determined as 0.4 m/s. The catalyst activity was …
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Co-gasification of biomass and plastic waste in a bubbling fluidized bed reactor
… LDPE and HDPE in the presence of three different bed materials, namely silica sand, olivine, and red mud. It was found that mixing the biomass with LDPE and HDPE increased hydrogen gas (H2) production. The Hydrogen gas concentration in the product gas increased slightly from 10% to 12% by volume …
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Utilization of cobalt catalyst for high temperature Fischer-Tropsch synthesis in a fluidized bed reactor
… the improved heat transfer characteristics of a fluidized bed reactor (FBR) will allow the use of cobalt catalyst for high temperature Fischer-Tropsch synthesis (HTFT). Cobalt was loaded onto a gamma alumina support, the catalyst was characterized using TPR, BET/BJH, XRD, and PSA to track changes …
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Scale-up investigation and hydrodynamics study of gas-solid fluidized bed reactor using advanced non-invasive measurement techniques
… for hydrodynamics similarity of gas-solid fluidized bed reactors (FBRs) by implementing our advanced non-invasive measurement techniques which are gamma ray computed tomography (CT) and radioactive particle tracking (RPT) that measure local hydrodynamic parameters. Experiments were carried …
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Influence of a Biodegradable Litter Amendment on the Pyrolysis of Poultry Litter
… and AmmoSoak were pyrolyzed in a bench-scale fluidized bed reactor. The objective of the second phase was to start-up a pilot-scale fluidized bed reactor unit. The poultry litter had a lower higher heating value (HHV), higher moisture, ash, nitrogen, sulfur, and chlorine contents than …
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Combined Anaerobic/Aerobic Treatment for Municipal Wastewater
… about the feasibility of using an anaerobic fluidized bed reactor-aerated solids contact process to treat domestic wastewater. In the proposed system the excess sludge produced in the aerobic stage is recycled to the anaerobic unit. The proposed configuration is very attractive because the …
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Chemical and Biological Treatment of Acid Mine Drainage for the Removal of Heavy Metals and Acidity
… the oxidation of ferrous iron in a packed bed bioreactor, the precipitation of iron within a fluidized bed, the removal of manganese and heavy metals (Cu, Ni, Zn) in a trickling filter at high (>9) pH, with final neutralization in a carbonate bed. The technique avoided the generation of …
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Activated Carbon from North Dakota Lignite
… by reacting lignite char with steam in a fluidized-bed reactor which was designed and constructed for this study. Effects of three variables temperature, residence time and particle size, at four levels were studied statistically using a Latin square design. When the analysis of variance …
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Phosphate precipitation as struvite from municipality wastewater
… molar ratios and Ca:P molar ratios. 3. Fluidised bed experiments to establish the characteristics of phosphate removal at varying levels of supersaturation. The results suggest that the pH of the system has a significant effect on phosphate removal due to its influence on the availability of PO4 …
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Char Reaction Kinetics in a Transport Gasifier
… scale tests were preformed using a pressurized fluidized bed reactor (PFBR) to simulate the conditions of a transport gasifier. From these experiments qualitative data on CO and CO2 production of the coal chars have been generated as a function of temperature, oxygen-to-carbon ratios, and fuel …
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Experimental characterization and chemical kinetics study of chemical looping combustion
… fuel power generation plants. A novel rotary-bed reactor concept was proposed by Zhao et. al. [1] in 2013. It is a compact gas fueled CLC reactor that could achieve high fuel conversion and carbon separation efficiencies. It is different from the widely applied and tested fluidized-bed reactor …
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Struvite Recovery From Source-Separated Urine Utilizing Fluidized Bed Technology
… solids (centrate) processed through upflow fluidized bed reactor technologies (Britton et al. 2005). Prior research determined the influence of pH, magnesium to phosphorus (Mg:P) molar ratio, and age of urine on purity, pharmaceutical content and pathogen inclusion in struvite precipitated …
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The oxidation of ethylene to ethylene oxide
… the effect of the operating variables of type of reactor, catalyst, ethylene feed concentration, temperature, and contact time on the products of oxidation of ethylene to ethylene oxide; and together with subsequent hydrolysis to evaluate the commercial feasibility of the manufacture of ethylene …
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Optimization of Struvite Recovery Utilizing Magnesium Oxide
… provide a "slowly available" form of Mg2+ in the reactor and consequently allow the reactor to be operated beyond design phosphorus (P) reactor loading. MgO has been utilized in other P recovery technologies, e.g. the Phospaq™ Process, but operation and performance of MgO using a full-scale Pearl® …
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Eulerian-Eulerian Modeling of Fluidized Beds
Fluidized bed reactor technology has been widely adopted within the industry as vital component for numerous manufacturing, power generation and gasification processes due to its enhanced mixing characteristics. Computational modeling of fluidized bed hydrodynamics is a significant challenge that …
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Characterization and mechanical properties of solar grade silicon in granular and nanopowder form
… for producing large quantities of polysilicon is fluidized bed reactor (FBR), where two main morphologies are produced, granular solid (1-3 mm) and nanopowders (30-300 nm). Grinding and fracture occurs in the granular solid during shipping and handling which can affect the final product properties …
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Modelling and CFD simulation of a fluidized bed process for the capture of C02 from fossil fuel combustion sources
… gases by mineral carbonation using a fluidised bed is studied in this project. CFD modelling has been used to study the efficiency of CO2 capture in a fluidized bed reactor containing a solid sorbent Calcium Oxide (CaO). This present work seeks to maximize CO2 conversion by a systematic …
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Biotreatment of waste streams containing isopropyl alcohol and copper from semiconductor manufacturing
… on activated carbon and used as packing for a fluidized-bed reactor. The bioreactor was able to degrade more than 95% of the IPA in the feed stream. In addition, the behavior of the bioreactor system was studied under transient feed conditions by introducing a series of pH and IPA shocks after …
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