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 33 for “"chemical reactor"”.
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On-line economic optimization of a chemical reactor
… system for a continuous flow stirred tank chemical reactor is designed, simulated, and installed on a pilot scale reactor. The control scheme utilizes a reaction and reactor model to predict on-line the economic optimum of a reactant concentration. In this manner the control system …
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Al/Al2O3 microchannel plasma chemical reactor for ozone synthesis
… device is fabricated from aluminum foil by chemical processing and mechanical ablation with photolithographic steps. Channels with 3 cm in length and 250 μm in width at the aperture of the channel produce spatially-uniform glow discharges in O2 or dry air feedstock gases at a pressures of 1 …
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Real-Time Prediction of Lean Blowout using Chemical Reactor Network
… of (1) real-time temperature measurements in the reactor, coupled with (2) the use of a real-time chemical reactor network (CRN) model to interpret the data as it is collected. The approach is tested using a laboratory jet-stirred reactor (JSR), operating on methane at near atmospheric pressure. …
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Multiphase flow and chemical reactor thermodynamics for hydrolysis and thermochemical production
… The copper-chlorine cycle is a promising thermochemical process which can cost-effectively produce hydrogen with less environmental impact. In this thesis, new predictive formulations and experimental data are presented to improve the conversion extent and reaction rates of the hydrolysis …
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A Study of Chemical Reactor Stability and Control by Liapunov's Direct Method
Made available in DSpace on 2014-12-08T23:18:07Z (GMT). No. of bitstreams: 1 6507074.pdf: 4927084 bytes, checksum: 8b660313219ee4ac45c0b65be6b71b4c (MD5) Previous issue date: 1965
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Modelling of Direct Hydrogen Combustion in Jet Engines: System-Level Analysis, Computational Fluid Dynamics and Chemical Reactor Networks
L'abstract è presente nell'allegato / the abstract is in the attachment
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An approach of compartmentalisation in development of non-isothermal chemical reactor network models for the high speed simulation of iso-octane combustion
… is used to investigate combustion systems. A chemical reactor network (CRN) is proposed for the simulation of the combustion of iso-octane. The compartmentalisation of a combusting system involves proposing a reactor network based on the flow fields predicted by computational fluid dynamics …
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Fuel/air Mixing and Nitrogen Oxide Formation in a Lean Premixed Gas Turbine Combustor
A chemical reactor design tool model was developed to predict engine-out NOx concentrations for lean premixed combustors. The CRM model only requires information regarding the reactor loading, the combustor inlet state, and the combustor geometry. Model improvements were obtained by including the …
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High-temperature microfluidic systems for thermally-efficient fuel processing
… requires a fuel processor-a high temperature chemical reactor that generates a hydrogen-rich stream for use by the fuel cell. In high-temperature microfluidic systems, where heat transfer rates are often very high, thermal management is a major challenge. This thesis investigates the use of …
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Computational Study of Turbulent Combustion Systems and Global Reactor Networks
… namely computational fluid dynamics (CFD) and chemical reactor network (CRN) methods. Both methods have been studied and analyzed as individual techniques as well as a coupled approach to pursue better understandings of the mechanisms and interactions between turbulent flow and mixing, ignition …
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Effect of Porosity on the Creep Rupture Behavior of Low Alloy Steel Weldments.
… is used in the fabrication of nuclear and petro-chemical reactor vessels, steam generators, piping, valves, etc. in which the operating conditions are high temperatures, high pressures and large cross-sections.Porosity is the most common cause for weld rejection in all welded materials. The …
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Issues in on-line optimisation
… The technique is applied on a dynamic model of a chemical reactor. The presence of errors in process measurements can invalidate the potential gains obtained from advanced optimisation and control techniques. Data reconciliation and gross error detection methods are used to reduce the inaccuracies …
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ΜΕΛΕΤΗ ΤΗΣ ΑΠΟΔΡΑΣΤΙΚΟΠΟΙΗΣΗΣ ΚΑΤΑΛΥΤΩΝ ΚΑΤΑ ΤΗΝ ΥΔΡΟΓΟΝΟΑΠΟΘΕΙΩΣΗ ΥΠΟΛΕΙΜΜΑΤΩΝΑΠΟΣΤΑΞΗΣ ΑΡΓΟΥ ΠΕΤΡΕΛΑΙΟΥ ΘΑΣΟΥ
… PHENOMENA WERE QUANTIFIED. A LABORATORY CHEMICAL REACTOR EQUIPPED WITH FOUR CATALYST BASKETS AND OF TOTAL INTERNAL VOLUME OF 890 CM3 WAS USED IN THE INVESTIGATION. AT BASKET RETATION RATES ABOVE 2500 RPM THE HDS RATEPROVED TO INDEPENDENT OF EXTERNAL TRANSPORT PHENOMENA OF THE REACTING …
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Maximum entropy quadratic model to characterize chemical non-equilibrium in re-entry flows
… non-equilibrium model for state-specific chemical kinetics based on method of moments. The focus of this project is on the rovibrational chemical kinetics of the N2-N system. Internal excitation, dissociation, recombination and energy transfer reactions, which are important processes in …
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Synthetic and structural investigation into homo- and hetero-, di- and tri-nuclear complexes containing osmium
… in direct, bright sunlight or a Hanovia photo-chemical reactor, has been studied. The nature of the products of the reactions depends critically on the experimental conditions employed. Os2(CO)₈X₂ (X = Br or I), among other products, are obtained in reasonable yield, directly from Os₃(CO)₁₂. …
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Internal energy relaxation in nitrogen plasmas
This work discusses the chemical kinetics of nitrogen molecules relaxing in a heat bath at constant temperature in a background gas composed of electrons and nitrogen atoms. The QCT (Quasi-Classical Trajectory) model recently developed at NASA Ames Research Center is used to study energy transfers …
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A new diagnostics tool for water injected gas turbines - emissions monitoring and modeling
… the system. The kinetics model is used within a chemical reactor network consisting of perfectly stirred reactors and plug flow reactors to represent the turbine combustion in both the primary and dilution zones. Changes in the measured emissions of certain species combined with a detailed …
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Hybrid bio-templated catalysts
… and highly active redox support enhancement. A chemical reactor was built to test the activity of the hybrid Rh-Ni@CeO₂ nanowires for the catalysis of ethanol into hydrogen gas in comparison to equivalent nanoparticle samples. Both nanowire and nanoparticle catalysts formed using these …
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Effects of Fuel Split Ratio on NOₓ Emissions of a Lean-burn Staged Combustor
… and a lean-burn staged combustor are compared. Chemical reactor networks, NPSS engine cycle models, and a TASOPT flight mission model are utilized. In comparison to previous studies, a wider range of pilot fuel fraction, from 16% to 100%, are tested over more refined thrust cases, from 0% to …
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Neural Networks in Bioprocessing and Chemical Engineering
… on their applications in bioprocessing and chemical engineering. This study introduces neural networks and provides an overview of their structures, strengths, and limitations, together with a survey of their potential and commercial applications (Chapter 1). In addition to covering both the …
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