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이영희,YAMAGUMA,M .,목연수,황명환,우인성,조정국 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3
In this paper, characteristics of ozone generation by using coil and SPCP+DC corona reactor was studied. The ceramic-based surface discharge electrode, which was first invented as a high-efficiency ozonizer, has been used as an experimental plasma chemical reactor.(Surface Induced Plasma Chemical Processing, SPCP.) The electrode, however, has a structural disadvantage that a highly energetic plasma region is localized near the electrode surface, which may make it impossible for higher efficiency to realize. In an attempt to overcome this advantage, we have developed a hybrid reactor which employs a corona discharge unit together with the surface discharge unit. Experimental results suggest that the efficiency of the ozone production rate is improved when positive corona discharge is added.
방전 Plasma 반응에 의한 NOx 의 안전처리에 관한 연구
최재욱,산외서수 한국산업안전학회 2000 한국안전학회지 Vol.15 No.2
In this experiment, we studied about concentration characteristics of NO_χ and generation of ozone in the reactor of corona discharge type by using mixed gas of NO/N₂ and N₂/O₂. In the case of the initial NO concentration increased, decrease rate of NO concentration was weakened and discharge input power of minimum NO concentration became high. When NO concentration was high, NO decomposition limit was appeared. And NO reduction rate was decreased, when initial NO concentration and discharge input power increased. When discharge input power was 5W, we could know the most proper energy value for treatment of NO. When the concentration of initial NO increased, generation of ozone decreased and in the case of same concentration of NO, according to discharge input power increase, generation of ozone increased.
Improved Decomposition Efficiency of Nitrogen Oxides using Superposing SPCP and Corona Discharges
Woo, In Sung,Kang, An Soo,YAMAGUMA, M .,Kang, Hyun Choon,Cho, Jeong Kuk,Hwang, Myung Whan 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.2
The superposing effect of an SPCP(Surface discharge-induced Plasma Chemical Process) and corona discharge were studied for the removal of NO_x, from industrial flue gases. The NO_x, removal rates caused by an SPCP, corona discharge, and superposing discharge were monitored and compared. The parameters included the concentration, flow rate of gas, frequency, and type of discharge. The experimental results showed that the NO_x, removal rate with a superposing discharge was 10∼30% higher than that with the other two modes. The maximum obtainable NO_x, removal rate with only a SPCP (18 W) on a corona discharge (7 W) was 85% and 12%, respectively. However, the combination of the two modes, produced a 95% NO_x removal rate with a discharge power of 18 W with a lower frequency (450 Hz). A higher NO_x removal rate was observed with a lower frequency in the upper electrode in the combined reactor and a higher frequency in the lower electrode. Accordingly, corona discharge (below 600 Hz) in the current study, a combined with an SPCP electrode (at a lower power) appeared to be the best method to remove NO_x.
황명환,우인성,산외서수 한국산업안전학회 2000 한국안전학회지 Vol.15 No.3
In order to cope with environmental problems caused by harmful gases emitted from various industrial sources, a new technology which employs discharge plasma formed in ordinary atmospheric pressure has been intensively investigated in many industrialized nations. Although a plenty of useful outcomes and suggestions have been made public by scientists in this field, few commercial products which effectively decompose pollutant gases have appeared as yet. This is partly because that the energy efficiency of a most effective plasma reactor has not reached a satisfactory level in comparison with those of devices using conventional technologies. In an attempt to solve the problem mentioned above, we noticed to combine heterogeneous electrical discharges. This concepts is based on that each plasma reactor has its specific spatial region in which chemical reaction are active and by electrically affected with another reactor of different type, the activated region would increase - which may lead to cutting down the energy consumption. To prove this concept experimentally, two different discharge equipments, a plane ceramic-based surface discharge electrode and a corona electrode with tungsten needle array, are selected and combined to fabricate a hybrid plasma reactor. The results are summarized as follows; (1) Ozone concentration generated in the plasma region drastically increases when the positive corona discharge is added to the surface discharge. The rate of increase of ozone depends on the frequency of the surface discharge. The negative corona, however, does not contribute to the improvement of the ozone generation. (2) NO(nitrogen monoxide) decomposition rate also improves by simultaneously applying the surface and the positive corona discharges. The effect of the corona superposition is more evident when the level of the surface discharge is moderate. (3) By adjusting the corona level, the net energy efficiency during NO decomposition improves in comparison with the simple surface discharge reactor.
진동형 분진 최소착화에너지측정장치에서 분진 응집현상이 미치는 영향
정재희,최충석,목연수,최광석,황명환,우인성,Yamaguma, M.,Kodama, T.,Cheung, W.L. 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3
It is widely recognized that Hartmann tube for measuring the minimum ignition energy(MIE) of powder. But It requires long time and operational skills for measuring. As a variety of new fine powders are being produced day by day in industry, Japen has been developing a measurement system which employs a new method to create a dust/air mixture in a miniature combustion box. In this system, by vibration, the powder is successively fed downward through a hopper made up of metal mesh, and then it is formed into a thin, certain-like, dust/air mixture. With this new apparatus, three types of powder-Lycopodium, Anthraquinone, and Polyacrylonitrile-were tested and the data of MIE were compared with those of a conventional apparatus (the Hartmann tube). Two of them agreed satisfactory, but the other, Anthraquinone, showed quite different values. It is guessed that the agglomerations of the powder particles appear because of particle shapes, static-charge and humidity.