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 27 for “"low NOx"”.
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Structure and Nitrogen Chemistry in Coal, Biomass, and Cofiring Low-NOx Flames
… pilot-scale facility was fired with a dual-feed low-NOx burner capable of independently conveying 2 separate fuels unblended to the burner. Spatially detailed gas species measurements were made for 8 flames, including a coal, straw, finely ground straw, wood, and 4 straw/coal cofiring flames. …
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Experimental investigation and numerical modeling of radially stratified low-NOx natural gas flames
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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A theoretical assessment of fuel combustion attributes to enhance the operational envelope of HCCI engines
… provide high efficiencies while producing ultra-low nitrous oxides (NOx) and particulate matter (PM) emissions compared to existing compression ignition (CI) and spark ignition (SI) engines. HCCI engines operate on the principle of having a dilute, premixed charge that reacts and burns …
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experimental investigation of a reacting transverse jet in a high pressure oscillating vitiated crossflow
… fuel are injected downstream of a lean premixed low NOx primary combustion zone. The gas residence time at elevated temperatures is decreased resulting in lower thermal NOx, and the reduced oxygen and high temperature vitiated primary zone flow further help to reduce pollutant emissions and …
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Influences on durability and leaching behaviour of concrete: new technologies in fly ash production
… These primarily included co-combustion, low NOx, supercritical and oxy-fuel technologies, although other available materials (run-of-station, air-classified, processed and stockpiled fly ashes) were included for comparison.<br/><br/>The initial experimental work involved physical and …
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Reduction of NO X Emissions in a Down-Fired Boiler
Nitrogen Oxides (NOx) are known to be among the pollutants resulting from fossil fuel combustion with particularly harmful effects on the environment and human health. Increased concern for the effects of NOx and other pollutants has prompted the European Community (EC) to draw up legislation on …
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Oxidschichtbildung und Materialprobleme metallischer Werkstoffe bei Verbrennungsprozessen mit Heizöl EL
… 900°C and 1050°C in a burner rig equipped with a low-NOx recirculation burner by application as material of the burner flame tube. Further on, the oxide scale on a woven wire cloth made of a Ni-Cr-based alloy was analysed. The wire cloth was used as the hot surface of a radiant burner at …
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A new diagnostics tool for water injected gas turbines - emissions monitoring and modeling
… systems attain both high thermal efficiency and low emissions. The attainment of low emissions from natural gas fired turbines, in particular low NOx emissions, is of considerable environmental importance especially as coal becomes a less favorable fuel source. Our current project addresses …
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Model-based active control of thermoacoustic instability in continuous combustion processes
… while maintaining performance objectives such as low NOx emission and high efficiency. This thesis considers the physics behind the thermoacoustic instability and utilizes a model based on the physics to understand the problem and design an active controller to suppress the instability. A …
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Developing fundamentally based models for autoignition
… (HCCI) engine, highly promising with its low Nox and particulate emissions and high efficiency. However it is difficult to control HCCI autoignition. In general accurate prediction of the autoignition behavior of fuel/air mixtures has been difficult, due to inadequate knowledge of low …
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Optimizing conventional combustion and implementing low-temperature combustion of biodiesel in a common-rail high-speed direct-injection engine
… effects on engine emissions. Tests were run at low to moderate engine load at different engine speeds. It was found that with the ECM’s default settings, higher blends of biodiesel tended to result in higher NOx emissions and lower soot emissions, in line with previous studies. It was also found …
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Analysis of the quantity and cost of modelled nitrate deposition to the Vaal River from power station emissions with insights for cost-benefit analysis and policy recommendations
… deposition originating from power station NOx emissions. The objectives were: to examine the changes in nitrate deposition for the years 1980, 2005, 2006 and 2014; to determine the costs associated with nitrate deposition to freshwater ecosystems for the South African context; to calculate …
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Flame stabilization and mixing characteristics in a stagnation point reverse flow combustor
… referred to as the Stagnation Point Reverse-Flow (SPRF) combustor, was recently developed that is able to operate stably at very lean fuel-air mixtures and with low NOx emissions even when the fuel and air are not premixed before entering the combustor. The primary objective of this work is to …
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Chemical and Physical Studies of Secondary Organic Aerosol Formed from Beta-pinene Photooxidation
… carboxylic acid, ketone and nitrate. Following the chemical composition characterization of products, the shape, phase state and density of generated particles were determined. Images from a scanning electron microscope (SEM) revealed that SOA particles from -pinene were commonly …
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Experimental investigation of nitrogen oxide production in premixed reacting jets in a vitiated crossflow
… experimental investigation of nitrogen oxide (NOx) emissions from reacting jets in a vitiated crossflow (RJICF). It is motivated by interest in axial staging of combustion as an approach to reduce undesirable NOx emissions from gas turbine combustors operating at high flame temperatures …
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Pathways for Low Emissions Utilizing Spray Targeted Reactivity Stratification (STARS) in High Efficiency Natural Gas Dual Fuel Combustion
… focuses on experimental analysis of dual-fuel low temperature combustion (LTC), which can be used as a strategy to reduce engine-out emissions and increase engine efficiencies. Dual fuel LTC uses two different fuels, a high reactivity fuel (HRF) and a low reactivity fuel (LRF). The HRF has a …
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Mechanistic Investigation of FCC CO/NOx Emission Control Additives
… released from this unit in the form of NOx and NH3. Among the different technologies currently employed to control these pollutants, the use of catalytic additives is the most attractive one, as it is simple, cost-effective, and applicable to existing FCC units without the need for …
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Model-Based Control of Gasoline Partially Premixed Combustion
… combustion engine concept that aims to yield low NOx and soot emission levels together with high engine efficiency. PPC belongs to the class of low temperature combustion concepts where the ignition delay is prolonged in order to promote the air-fuel-mixture homogeneity in the combustion …
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On potential effects from the aviation and refrigeration sectors on ozone and climate
… of relevant gases and particles, subsequently followed by a complex set of chemical and physical processes. For the refrigeration sector, iodotrifluoromethane (CF3I) and methyl iodide (CH3I) are two very short‐lived substances (VSLSs) with potential commercial applications in refrigeration to …
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Anaerobic Fermentation of Food Waste and Glycerol to Hydrogen
… of organic wastes, especially any abundant, low-cost wastes with a high content of simple sugars. Molar hydrogen yields from fermenters (aka digesters) are affected by pH, organic loading rate (OLR), hydraulic residence time (HRT), and substrate type. A less studied process to increase yield …
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