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.
Results
Showing 1 to 20 of 20 for “"Emissions Control"”.
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Post-combustion emissions control for aero-gas turbine engines
Aviation NO[subscript x] emissions have an impact on air quality and climate change, where the latter is magnified due to the higher sensitivity of the upper troposphere and lower stratosphere. In the aviation industry, efforts to increase the efficiency of propulsion systems are giving rise to …
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Nanocomposites for nitrogen oxide emissions control in lean-burn engines
(cont.) reducing agent than propane in the SCR of NO. Pt-Rh/CuO/A1₂O₃ nanocomposites capable of adsorbing SO₂ in oxygen-rich environment as metal sulfates and releasing SO₂ in reducing atmosphere were synthesized with sequential precipitation technique. These CuO-based sorbents possessed excellent …
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Calibration and performance of a selective catalytic reduction (SCR) bench rig for NOx̳ emissions control
A laboratory test rig was designed and built to easily test SCR (Selective Catalytic Reduction) technology. Equipped with three 6 kW heaters, connections for liquid N2 and an assortment of test gases, and a connection with an MKS NOx Analyzer, the rig allows for a vast range of SCR test conditions, …
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Evaluation of catalyst and alcohol fuel emissions control for a small four cycle utility engine
This research investigated emissions of formaldehyde, acetaldehyde, carbon monoxide, and hydrocarbons from a small utility engine fueled with mixtures of gasoline, ethanol, and methanol. Measurements made for each fuel mixture, with and without a catalyst, allowed a qualitative evaluation of the …
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Performance evaluation of exhaust aftertreatment devices used for emissions control on diesel engines employed in underground coal mines
… to an ISO 8-Mode test cycle. Experimental emissions data, sampled from a full-flow dilution tunnel, suggests that particulate traps can reduce the mass emission rates of particulate matter (DPM) by nearly 90%, while reductions in fuel sulfur content (0.04% compared to 0.37% by mass) can …
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Comparison of heavy-duty diesel engine emissions between an on-road route and engine dynamometer simulated on-road cycle
… (NOx) and particulate matter (PM). As a means of emissions control, engine dynamometer certification is currently employed. Current certification cycles provide for standardized comparisons, but may not be indicative of real-world emissions. Accurate in-use emissions testing would provide more …
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Evaluating heavy-duty diesel engine aftertreatment devices with a split exhaust configuration
… and lean-NOx catalysts as part of the Diesel Emissions Control-Sulfur Effects (DECSE) program. In order to perform thermal aging of the DOC and lean-NOx catalysts simultaneously and economically, each catalyst was sized to accommodate half of the engine exhaust flow. Simultaneous catalyst …
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Petroleum refining and air quality management
… contributes almost five percent of the total emissions from all anthropogenic sources. A document containing a complete set of guidelines for use in the refining industry which satisfies the current and anticipated air quality legislations and regulations in the U.S. is necessary. In the past, …
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Influence of fuel sulfur content on emissions from diesel engines equipped with oxidation catalysts
… alternative for alleviating regulated exhaust emissions of hydrocarbon (HC), carbon monoxide (CO), and particulate matter (PM) from diesel-fueled heavy-duty engines. This study was a part of the Diesel Emissions Control-Sulfur Effects (DECSE) program that was aimed at determining the impact of …
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Structural Design and Analysis for a DeNOₓ Catalyst in Aviation
… One technology that has proven effective in controlling NOₓ emissions in other industries is selective catalytic reduction (SCR). As a post-combustion emissions control (PCEC) exhaust treatment, the technology works by introducing a nitrogen-rich reductant into the exhaust stream, then …
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The role of legislative processes and electric utilities in effecting global environmental goals
… greenhouse gas and acid rain causing emissions which are being spewed into the air. Developed countries are to blame for most of the anthropogenic global warming gases which have already accumulated in the atmosphere. Developing countries, however, which are facing periods of large …
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Measurement and characterization of low volatility organic compounds in the atmosphere
… of organic species from primary gas phase emissions to secondary organic aerosol (SOA) is highly complex and poorly understood, proving difficult for even stateof- the-art computational models to predict. This thesis describes the in-depth characterization and redesign of a previously …
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Performance of an air-to-air heat pump heating and recovery unit at high ventilation rates
… recognises the need for reduced carbon dioxide emissions and explores issues of indoor air quality and sick building syndrome and how increased ventilation rates can address them. The proposition investigated in this thesis is that air source recovery and heating by heat pump systems, combined …
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The Political Economy of Alternative Investments
… pricing and trading volume in China's carbon emissions trading systems (ETS) across four major markets (Beijing, Shanghai, Guangdong, and Hubei) between 2014 and 2022. Using logistic regression and AR(1)-GARCH estimations, the results show a negative relationship between political uncertainty …
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Environmental Impacts of Future Aviation Propulsion Systems
… impacts attributable to aviation gas turbine emissions and the means of mitigating them with a focus on the propulsion system. Specifically, this thesis addresses aspects of 1) aerosol formation from aviation-attributable NOx and SOx, 2) the technical extent to which the air quality and …
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MRI Studies of Gas Hydrodynamics in Automotive Particulate Filters
… compliance with legal limits set on vehicle emissions and are often combined with a catalyst to increase their functionality as an emission control technology. Knowledge of the exhaust gas hydrodynamics in filter systems is crucial for the optimisation of their structure and operation. The …
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An empirical investigation of the impact of global energy transition on Nigerian oil and gas exports
… of renewable energy consumption and carbon emissions reduction on Nigeria’s oil and gas exports. The qualitative part involved interviews with twenty senior government officials in Nigeria from six selected Federal Ministries, Departments and Agencies (MDAs), representatives of civil society …
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Predicting Soot Emissions with Advanced Turbulent Reacting Flow Modelling
… of hydrocarbon fuels. The prediction of soot emissions is crucial if next-generation combustion devices are to mitigate the deleterious effects of particulate matter on human health and the environment. Theories for the distribution of size and shape of soot particles in turbulent reacting …
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Teamwork phenomena : exploring path dependency and learning in teams during architectural design of sustainable maritime shipping systems
… limits on sulphur oxides and nitrous oxides emissions from ship exhausts. According to Japanese authorities, it is expected that the transition from the currently predominant use of Heavy Fuel Oil (HFO) to Liquified Natural Gas (LNG) will proceed, and LNG-fueled ships have already launched in …
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Development and assessment of model-based and sensor-based algorithms for combustion and emission control in diesel engines
L'abstract è presente nell'allegato / the abstract is in the attachment