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A Study of Mixing System Using Gas-Liquid Ejector
ZhenHua Jin,YouSin Jun,Tony Suryo Utomo,XueSong Li,HanShik Chung,HyoMin Jeong 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A literature review has been carried out on reactor using gas-liquid ejector. The aim of this paper is further studies to achieve deeper understanding in this field. First to investigate the influence of operating conditions and design parameters on the hydrodynamics and the mass transfer properties of a loop reactor. This paper provides a literature review on the ejectors applications in the mixing system. A number of studies are grouped and discussed in several topics. Such as the background, theory of ejector, mixing characteristics, optimization of the system. Since the high efficiencies reactor using ejector widely used in gas-liquid system, especially in a number of chemical and biochemical processes. This is due to their high efficiency in gas dispersion resulting in high mass transfer rate and low power requirements. Circulation and gas dispersion are achieved when the liquid is injected into the reactors with high velocity which entrain the gas phase and create a fine dispersion of the two phases. Thus ejector has been applied to the mixing system.
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이병호(Byongho Lee),이중섭(Chungseub Yi),전유신(Yousin Jun),정한식(Hansik Chung),정효민(Hyomin Jeong) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In a conventional and lean operating engine, the state of mixture is very important in the combustion and emission characteristics. Lean operation is known to decrease the formation while maintaining a good fuel economy, but the unstable operation due to misfire and erratic combustion prevents engines from being operated at very lean mixtures, so both combustion rates and exhaust emission formation need to be satisfied comparablely. In this study, it is designed and experimented the modified engine, and analyzed the combustion and exhaust emission according to the change of engine speed and with adding ozone. The conclusions were drawn out and enumerated as a following. 1. At the experimental result of automobile diesel engine, it has been verified that the formation of particulate matter(PM) gas is able to be lower with the addition of optimum quautities of ozone. 2. Carbon monoxide(CO) was formed by the lack of oxygen and the thermal dissociation in the combustion process. Therefore, with the change of swirl valve's position and addition of oxygen and ozone, CO formation was decreased by the increasing of excess O2, and increased by the combustion gas temperature higher. As a result of the two effects, CO formation was decreased in this study. 3. Hydrocarbon(HC) was formed by the lack of 02, and the flow of mixture in cylinder. According to opening of the swirl valve and adding the oxygen and ozone, hydrocarbon gas was decreased by respectively 20%, 9%, and 27.5%. 4. Nitric oxides(NOx) was strongly affected by the combustion gas temperature. As a result of respectively experimental conditions, NOx formation was increased about 20% due to be the higher combustion gas temperature.
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