The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Shinichi Kikkawa - One of the best experts on this subject based on the ideXlab platform.
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Oxygen storage capability of brownmillerite type ca2almno5 δ and its application to Oxygen Enrichment
Chemistry of Materials, 2013Co-Authors: Teruki Motohashi, Yuka Hirano, Yuji Masubuchi, Kazunori Oshima, Tohru Setoyama, Shinichi KikkawaAbstract:The Oxygen storage capability was investigated for Ca2(AlxMn1–x)2O5+δ (0.50 ≤ x ≤ 0.67) with a Brownmillerite-type structure. This oxide can store/release a large amount of excess Oxygen (∼3.0 wt %) topotactically in response to variations in temperature and the surrounding atmosphere in a highly reversible manner. The capacity and response of Oxygen storage are remarkable only in the vicinity of x = 0.50, that is, Ca2AlMnO5+δ, and rapidly deteriorated as the Al content increases. Owing to the high sensitivity in terms of Oxygen nonstoichiometry, Ca2AlMnO5+δ exhibits Oxygen intake/release ability when temperature swing between 500 and 700 °C is applied. With this characteristic feature of this oxide, a facile method for Oxygen Enrichment is demonstrated.
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Oxygen Storage Capability of Brownmillerite-type Ca2AlMnO5+δ and Its Application to Oxygen Enrichment
Chemistry of Materials, 2013Co-Authors: Teruki Motohashi, Yuka Hirano, Yuji Masubuchi, Kazunori Oshima, Tohru Setoyama, Shinichi KikkawaAbstract:The Oxygen storage capability was investigated for Ca2(AlxMn1–x)2O5+δ (0.50 ≤ x ≤ 0.67) with a Brownmillerite-type structure. This oxide can store/release a large amount of excess Oxygen (∼3.0 wt %) topotactically in response to variations in temperature and the surrounding atmosphere in a highly reversible manner. The capacity and response of Oxygen storage are remarkable only in the vicinity of x = 0.50, that is, Ca2AlMnO5+δ, and rapidly deteriorated as the Al content increases. Owing to the high sensitivity in terms of Oxygen nonstoichiometry, Ca2AlMnO5+δ exhibits Oxygen intake/release ability when temperature swing between 500 and 700 °C is applied. With this characteristic feature of this oxide, a facile method for Oxygen Enrichment is demonstrated.
Andre L Boehman - One of the best experts on this subject based on the ideXlab platform.
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impact of intake Oxygen Enrichment on oxidative reactivity and properties of diesel soot
Energy & Fuels, 2011Co-Authors: Hee Je Seong, Andre L BoehmanAbstract:Oxygen addition to a four-cylinder turbo-charged common rail diesel engine was carried out by intake Oxygen Enrichment and by fuel Oxygenation in order to study the effect of additional Oxygen on o...
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comparison of the impact of intake Oxygen Enrichment and fuel Oxygenation on diesel combustion and emissions
Energy & Fuels, 2004Co-Authors: Juhun Song, Vince Zello, Andre L Boehman, Francis Joseph WallerAbstract:Among continuing efforts to develop low-emission combustion engines, Oxygen-enhanced combustion has long been considered a promising approach. A number of investigations have focused on the effects of Oxygen addition on soot formation and oxidation by using various Oxygen introduction techniques, such as blending different Oxygen-containing fuels or direct Oxygen addition into the intake air stream. The present study of Oxygen addition was performed on a Volkswagen 1.9 L “TDI” turbodiesel engine to investigate and compare the relative effect of two Oxygen addition methods on diesel emission and combustion: Oxygen Enrichment of the intake air and Oxygenation of the fuel. The Oxygen Enrichment was accomplished by connecting an Oxygen generator to the intake air surge tank, while fuel Oxygenation was accomplished using two compounds with different cetane number and molecular structure. The key observations are that both intake Oxygen Enrichment and fuel Oxygenation via linear structure Oxygenated molecules ...
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COMPARISON OF THE IMPACT OF INTAKE Oxygen Enrichment AND FUEL OxygenATION ON DIESEL PARTICULATE EMISSIONS
2002Co-Authors: Juhun Song, Vince Zello, Philip John Young, Andre L Boehman, Francis Joseph WallerAbstract:Introduction Addition of Oxygen to assist the diesel combustion process is by no means a new idea. Significant work has been ongoing for some years regarding Oxygenation of diesel fuel through additives and alternative fuels [1,2,3,4]. Oxygen Enrichment of intake air has also been considered as a measure to control the PM emission and to improve thermal efficiency. Argonne National Laboratory has developed a membrane that efficiently separates standard air into Oxygen and nitrogen. Motivated by this novel method, recent work at University of Wisconsin-Madison has explored the impact of intake composition [5] and compared the impact of fuel Oxygenation and intake Oxygen Enrichment [6]. This recent work shed some light on the effects of intake charge composition, but left many unanswered questions. The work presented here compares Oxygenated fuels with Oxygen Enrichment of intake air. In this case, we are examining the application of Air Products' VSA type A-040/120L Oxygen Generator to improving diesel engine operation.
Teruki Motohashi - One of the best experts on this subject based on the ideXlab platform.
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Oxygen storage capability of brownmillerite type ca2almno5 δ and its application to Oxygen Enrichment
Chemistry of Materials, 2013Co-Authors: Teruki Motohashi, Yuka Hirano, Yuji Masubuchi, Kazunori Oshima, Tohru Setoyama, Shinichi KikkawaAbstract:The Oxygen storage capability was investigated for Ca2(AlxMn1–x)2O5+δ (0.50 ≤ x ≤ 0.67) with a Brownmillerite-type structure. This oxide can store/release a large amount of excess Oxygen (∼3.0 wt %) topotactically in response to variations in temperature and the surrounding atmosphere in a highly reversible manner. The capacity and response of Oxygen storage are remarkable only in the vicinity of x = 0.50, that is, Ca2AlMnO5+δ, and rapidly deteriorated as the Al content increases. Owing to the high sensitivity in terms of Oxygen nonstoichiometry, Ca2AlMnO5+δ exhibits Oxygen intake/release ability when temperature swing between 500 and 700 °C is applied. With this characteristic feature of this oxide, a facile method for Oxygen Enrichment is demonstrated.
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Oxygen Storage Capability of Brownmillerite-type Ca2AlMnO5+δ and Its Application to Oxygen Enrichment
Chemistry of Materials, 2013Co-Authors: Teruki Motohashi, Yuka Hirano, Yuji Masubuchi, Kazunori Oshima, Tohru Setoyama, Shinichi KikkawaAbstract:The Oxygen storage capability was investigated for Ca2(AlxMn1–x)2O5+δ (0.50 ≤ x ≤ 0.67) with a Brownmillerite-type structure. This oxide can store/release a large amount of excess Oxygen (∼3.0 wt %) topotactically in response to variations in temperature and the surrounding atmosphere in a highly reversible manner. The capacity and response of Oxygen storage are remarkable only in the vicinity of x = 0.50, that is, Ca2AlMnO5+δ, and rapidly deteriorated as the Al content increases. Owing to the high sensitivity in terms of Oxygen nonstoichiometry, Ca2AlMnO5+δ exhibits Oxygen intake/release ability when temperature swing between 500 and 700 °C is applied. With this characteristic feature of this oxide, a facile method for Oxygen Enrichment is demonstrated.
Suresh K Aggarwal - One of the best experts on this subject based on the ideXlab platform.
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effects of Oxygen Enrichment and fuel unsaturation on soot and nox emissions in ethylene propane and propene flames
Combustion and Flame, 2018Co-Authors: Krishna C Kalvakala, Viswanath R Katta, Suresh K AggarwalAbstract:Abstract We have performed a computational study on the effects of Oxygen Enrichment 1 and fuel unsaturation on the flame structure, PAHs, soot, and NOx emissions. Counterflow flames burning ethylene, propane, and propene are simulated with CHEMKIN-Pro, using a validated mechanism with 197 species and around 5000 reactions. The stoichiometric mixture fraction (ζst) is varied by simultaneously using O2-enriched airstream and N2-diluted fuel stream such that the adiabatic flame temperature is nearly constant. Dominant reaction paths are analyzed to examine the relative roles of hydrodynamics and changes in flame structure on PAHs and soot emissions. As ζst is increased, results indicate a significant reduction in acetylene and PAHs formation, and with additional soot oxidation in the post flame region, it leads to a nearly non-sooting flame. The drastic reduction in PAHs and soot formation can be attributed to both the hydrodynamic and the flame structure effects. At moderate Oxygenation levels, changes in flame structure seems to play a more prominent role, while at higher Oxygenation levels, the hydrodynamic effect seems to be more important. With the increase in ζst, the O, OH, and H radical pool is enhanced, and, consequently, the intermediate species (propargyl, allene, and propyne) are reduced to smaller hydrocarbons, decreasing the formation of PAHs and soot. With further increase in ζst, the flame location shifts from oxidizer to fuel side, and, consequently, PAH species and soot get oxidized in the Oxygen rich region, leading to nearly soot free flames. However, as ζst is increased, NO emissions increase monotonically. At low ζst values, the prompt route contributes more to NO formation, while at high ζst values, the thermal route contributes more. The rate of production analysis indicates that the presence of double bond promotes reactions which produce higher amounts of allyl and propargyl species, and thus higher amounts of soot precursors; benzene and pyrene. Consequently, propene and ethylene flames produce significantly higher amount of soot compared to propane flames.
John Lucas - One of the best experts on this subject based on the ideXlab platform.
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burning characteristics of pulverized coal within blast furnace raceway at various injection operations and ways of Oxygen Enrichment
Fuel, 2015Co-Authors: Shan Wen Du, Weihsin Chen, Chien Hsiung Tsai, John LucasAbstract:In this research, coal combustion behavior across the regions of blowpipe, tuyere, and raceway of blast furnace are numerically examined. Three different lance configurations, including a single lance, a double air-cooled coaxial lance, and an oxy-coal lance with different Oxygen Enrichment patterns, are taken into consideration. The coal combustion efficiency by the double lance injection is 5.1% higher than that by single lance injection. From the calculated temperature by the oxy-coal lance, coal ignition is retarded due to the cooling effect of enriched Oxygen flowing through the lance annulus, resulting in the moderation of pressure loss within the raceway. Most importantly, the enriched Oxygen becomes the combustion enhancer in the downstream of coal plume after ignition is triggered. Consequently, the coal burnout under the oxy-coal lance injection is comparative to that under the double air-cooled lance injection. The performance of blast furnace may be improved with the advantages provided by the oxy-coal lance injection. Compared with the single lance injection, coal trajectories under the oxy-coal lance injection are closer to the tuyere exit due to the higher inertia force of coal particles against hot blast. This should be taken into account for the designs of the oxy-coal lance.
