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 36 for “"off-gas"”.
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Development and validation of a combustion model for a fuel cell off-gas burner
… comprising a solid oxide fuel cell coupled to a gas turbine has been developed by Rolls-Royce Fuel Cell Systems. As part of the cycle, a fraction of the unreacted fuel (the off-gas) and oxidizer streams is reacted in a burner, which is the main source of pollutant formation. In this thesis a …
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Design of a primary off-gas scrubber for a ferro-manganese electric arc furnace process
… which forms carbon dioxide (CO2). The balance of gas in the process is primarily nitrogen (N2), which comes from the air drawn into the furnace, as it is impossible to seal the furnace off perfectly. The oxygen from the air also combusts with the carbon monoxide, however there is always a small …
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Effects of temperature and heating rate on off-gas composition and pyrene removal from an artifically-contaminated soil
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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A Comprehensive Evaluation of Off-Gas Emissions From A Catalyst-Aided, Amine-Based, Post Combustion Capture of CO2 From Industrial Exhaust Gas Streams
… which is undoubtedly one of the major greenhouse gases blamed for global warming. It is imperative to ensure that while we aim to capture CO2 to achieve the production of clean energy, other contaminants are not released into our environment, so as not to defeat the main purpose of ensuring the …
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Aging Study of Silver-exchanged Mordenite and Silver-functionalized Silica Aerogel in Dry Air, Humid Air, No and No2
… one of the volatile radioactive species in the off-gas streams generated from the spent nuclear fuel reprocessing system, and it is essential to remove 129I vapor because 129I has a long half-life (1.6 x 107 years) and can be fatal to the human body if released to the environment. Radioactive …
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Computer modelling and analysis of particulate laden gas flows
… and heat transfer processes in an industrial off-gas ducting system. A mathematical model is developed and then applied to predict the processes occurring in the off-gas ducting system. Particular attention is focussed on the two-phase thermal behaviour and the chemical reactions. A …
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Adsorption of Iodine and Water on Silver-Exchanged Mordenite
… fuel to recover the fissile materials generates off gases including radioactive nuclides namely 3H (tritiated water, H3HO), 129I, 85Kr, 135Xe, and 14C. Due to its high quantity in off-gas streams and long half-life (1.59 million years), 129I removal from the off-gas streams is a significant …
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The kinetics of ferrous iron oxidation by Leptospirillum-like bacteria in absence and in presence of pyrite and pyrite/arsenopyrite mixtures in continous and batch cultures
… method is that the process is followed by the off-gas analysis and redox potential of the solution. With the off-gas analysis the oxygen and carbon dioxide concentration in the incoming air and outcoming gas was measured and the ferrous iron concentration in the solution was derived with the …
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An electrochemical reduction process for the recovery of copper powder from a refinery effluent stream
… less process steps to final product. The off-gas from hydrochlorination contains predominantly silver, copper, nickel and iron. This off-gas undergoes a quench-scrub to condense the base metal chlorides. The quench-scrub liquor undergoes a dechlorination process with sulfuric acid to …
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Nutzung eines 16-fach parallelen Bioreaktorsystems zur Entwicklung von Prozessen für die Herstellung von rekombinanten Proteinen in Mikroorganismen
… in product concentration. Condensate in the off-gas filters led to different aeration rates in the respective vessels. These differences in aeration conditions made an impact on growth and glucose consumption leading to different derepression conditions of the FMD-Promoter and finally …
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Purification of Ammonia by Pressure Swing Adsorption
… recovery of specific compounds from a gas under pressure. In this study, an ammonia production process that incorporates PSA technology for the recovery of ammonia from reactor-off gas is developed. Conventionally, ammonia is recovered via energy-intensive refrigeration and condensation …
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Microalgae growing in stressed environments and their antioxidant potential from production of secondary metabolites
… to capture carbon (CO2) from industrial off-gas, but sulphur dioxide often present in these gasses increases growing media acidity making it essential to find microalgal strains able to survive in pH 3.0-4.0. High metal concentration, acidity, solar irradiance, and nutrient limitations …
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BISMUTH-FUNCTIONALIZED SORBENTS FOR RADIOIODINE CAPTURE
… aged in an oxidizing atmosphere using 1% NO2 gas before and after iodine capture. Xerogel showed gradual decline in iodine capture with longer aging time and performed better when compared to free standing nanoparticles, suggesting the protective action of surrounding xerogel. After aging, 82 …
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Ammonia emissions and pathogen inactivation during controlled composting of pig manure
… temperature gradients and enable analysis of the off-gas for ammonia, water, oxygen and carbon dioxide. Respirometry showed that the optimal temperature for composting pig manure was about 60°C. A simulation model suggested that ammonia emissions could be reduced by lowering the initial pH and …
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Temperature modeling and control of the sulfuric acid plant in an industrial smelter
… amount of sulfur present in sulfide ores, the off-gas produced from pyrometallurgical processing is laden with sulfur dioxide (SO2). Production of sulfuric acid (H2SO4), from off-gas laden with SO2 is one of the methods used at smelters to reduce the amount of SO2 being released into the …
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Field Trials of Ex Situ Smouldering Treatment (STARx) of Oil Sludge
… between initial soil concentrations, off-gas production, mass destruction rates, cycle times, and peak temperatures provide important insights into the performance and costs of applying the technology at field scale. STARx was shown to successfully destroy the wastes to below …
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Understanding The Mechanism Of Gaseous Iodine Capture Using Sodium-Loaded Carbon Foams
… iodine saturated environment and in a simulated off-gas environment with low concentrations of iodine, high gas velocities, and low resonance times. The synthesized carbon foams contained sodium in the form of sodium carbonate, along with remnants of the original organic polymer, which added …
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Optimization of Low-Level Controllers and High-Level Polymer Grade Changes
… The results show increased performance when roll-off is present in the feedback loop and that similarities exist between PID and high-order Youla-parametrized controllers. Robustness margins separating the dead-time uncertainty from other process uncertainties are presented. Methods to compute the …
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A nonlinear control algorithm for fuel optimal attitude control using reaction jets
… for spacecraft attitude dynamics using on-off gas jets. In the development of a controller, we explore four control algorithms within a single-step control framework where the step is the fundamental update time of the digital controller. The benchmark controller is a basic pulse-width …
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