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증착 구간에서의 온도 제어에 따른 SiO<sub>2</sub> 초미립자의 증착 특성 고찰
유수종,김교선,You, Soo-Jong,Kim, Kyo-Seon 강원대학교 산업기술연구소 1996 産業技術硏究 Vol.16 No.-
The deposition characteristics of ultrafine $SiO_2$ particles were investigated in a tube furnace reactor theoretically and experimentally controlling tube wall temperature in deposition zone. The model equations such as mass and energy balance equations and aerosol dynamic equations inside reactor and deposition tube were solved to predict the particle growth and deposition. The particle size and deposition efficiencies of $SiO_2$ particles were calculated, changing the process conditions such as tube furnace setting temperature, total gas flow rate inlet $SiCl_4$ concentration and were compared with the experimental results.
2단 튜브형 가열로 반응기에 의한 초미세 SiO<sub>2</sub> 입자의 제조 및 증착 연구
유수종,김교선,You, Soo-Jong,Kim, Kyo-Seon 강원대학교 산업기술연구소 1997 産業技術硏究 Vol.17 No.-
The effects of preheating the gas stream on deposition characteristics of ultrafine $SiO_2$ particles were investigated theoretically. The model equations such as mass and energy balance equations and aerosol dynamic equations were solved to predict the particle growth and deposition. The gas temperatures, $SiCl_4$ concentrations, $SiO_2$ particle volumes, $SiO_2$ particle sizes and deposition efficiencies of $SiO_2$ particles were calculated for various preheating temperatures. As the preheater setting temperature increases, the $SiO_2$ particle size distribution becomes more uniform, because the effect of $SiCl_4$ diffusion decreases.
연소반응을 이용한 TiO<sub>2</sub> 초미립자 제조 공정에 대한 이론적 연구
채범산,김교선,Chae, Bum-San,Kim, Kyo-Seon 강원대학교 산업기술연구소 1997 産業技術硏究 Vol.17 No.-
A numerical model has been proposed for a diffusion flame reactor to manufacture ultrafine $TiO_2$ powders. The model equations such as mass balance equation, the 0th, 1st, and 2nd moment equations of aerosols were considered. The phenomena such as $TiCl_4$ reaction rate, $TiO_2$ nucleation rate and the coagulation of $TiO_2$ powders were included in the aerosol dynamic equation. It is found that the $TiO_2$ particle concentration becomes higher, as the inlet $TiCl_4$ concentration and the total gas flow rate increase, and also as the flame temperature decreases. The $TiO_2$ particle size increases, as the flame temperature and the inlet $TiCl_4$ concentration increase and the total gas flow rate decreases.
NO<sub>x</sub> 제거용 저온 플라즈마 반응기에서의 플라즈마 화학 및 입자 성장
김동주,김교선,Kim, Dong-Joo,Kim, Kyo-Seon 강원대학교 산업기술연구소 1999 産業技術硏究 Vol.19 No.-
We analyzed theoretically the removal efficiency and the particle growth inside the pulse corona discharge reactor to remove $NO_x$ and investigated the effects of process variables such as the NO and $NH_3$ input concentrations. Most of NO is converted into $NO_2$ and $HNO_3$ and the $HNO_3$ reacts with $NH_3$ to form the $NH_4NO_3$ particles. About 6.4% of NO is converted into $HNO_2$ which form the $NH_4NO_2$ particles by reaction with $NH_3$. Some of $NO_2$ follows the reaction pathway to form $NO_3$ and $N_2O_5$. The amount of particles formed inside the reactor is basically determined by the input $NH_3$ concentration. The ratio of NO to $NH_3$ affects the reactor length for particle formation significantly. The higher the input concentrations of NO and $NH_3$ are, the faster the particles grow.