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- 저자 : 채범산 (검색결과 6 건)
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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.
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연소반응을 이용한 TiO₂초미립자 제조 공정에 대한 이론적 연구
채범산,김교선 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-
A numerical model has been proposed for a diffusion flame reactor to manufacture ultrafine TiO₂powders. The model equations such as mass balance equation, the 0th 1st, and 2nd moment equations of aerosols were considered. The phenomena such as TiCl₄reaction rate, TiO₂nucleation rate and the coagulation of TiO₂powders were included in the serosol dynamic equation. It is found that the TiO₂particle concentration becomes higher, as the ilet TiCl₄ concentration and the total gas flow rate increase, and also as the flame temperature decreases. The TiO₂particle size increases, as the flame temperature and the inlet TiCl₄concentration increase and the total gas flow rate decreases.
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초미립 TiO2 입자 제조를 위한 확산 화염반응기의 간략화된 모델
김교선,채범산 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.1
본 연구에서는 확산 화염반응기에서의 초미립 TiO₂ 분말 입자 제조시의 플러그 흐름 가정에 기초한 간략화된 모델식을 제시하였다. 모델식에서는 TiCl₄ 수지식, 에어로졸의 0차, 1차, 2차 모멘트 수지식을 수치모사로 풀었다. 반응기내의 공정변수로는 반응기 온도와 반응물의 농도, 전체 기체유량을 변화시키며 확산 화염반응기내에서의 TiO₂미립자의 농도및 입도크기와 표준편차 등을 반응기 위치에 따라 이론적으로 계산하였다. 전체 기체유량이 증가할수록 또는 반응기 화염온도가 감소할수록 반응기 출구에서의 최종 TiO₂ 입자 농도는 증가하였다. 반면에 반응기 화염온도가 증가할수록, 초기 TiCl₄농도가 증가할수록, 전체 기체유량이 감소할수록 생성된 TiO₂ 입자 크기는 증가하였다. We have proposed a simplified model equations for a diffusion flame reactor to prepare ultrafine TiO₂ powders, based on the assumption of plug flow. The model equations such as mass balance of TiCl₄, the 0th, 1st, and 2nd moment balances of aerosol were solved by a numerical simulation. The particle characteristics such as the concentrations, sizes and standard deviation of TiO₂ particles were theoretically investigated along the reactor length, varying the process conditions of flame temperatures, total gas flow rates and inlet reactant concentrations. It is found that the TiO₂ particle concentration at the reactor exit becomes higher, as the total gas flow rate increases, and also as the flame temperature decreases. On the other hand, the TiO₂ particle size increases, as the flame temperature and the inlet TiCl₄ concentration increase and as the total gas flow rate decreases.
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확산 화염반응기에 의한 TiO2 초미분체 제조시의 공정변수의 영향
김교선,채범산 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.6
본 연구에서는 확산 화염반응기에 의한 초미립 TiO₂분말 입자 제조공정을 이론적/실험적으로 분석하였다. 모델식에서는 TiCl₄반응물 수지식, 에어로졸 동력학식을 고려하였으며 TiCl₄반응속도, TiCl₂입자의 생성 및 충돌현상을 에어로졸 동력학식에 포함시켰다. 반응기 화염온도가 증가할수록, 초기 TiCl₄농도가 증가할수록 또는 전체 기체유량이 감소할수록 생성된 TiO₂입자 크기는 증가하였다. 실험을 통해 제조된 TiO₂분말의 구조는 주로 anatase 형태로 나타났으며 전체기체 유량이 감소하거나 또는 반응기 화염온도가 증가할수록 TiO₂분말 내의 rutile 함유량은 증가하였으나, 초기 TiCl₄농도와는 무관하였다. 반응기 최대 화염온도가 감소할수록 TiO₂입자의 비표면적은 증가하였다. We have studied the process to prepare the ultrafine TiO₂powders by a diffusion flame reactor, theoretically/experimentally. In model equations, the mass balance of TiCl₄and the aerosol dynamic equation were considered. The effects of TiCl₄chemical reaction, generation and coagulation of TiO₂particles were included in the aerosol dynamic equation. The TiO₂particle size increases, as the flame temperature and the inlet TiCl₄concentration increase or as the total gas flow rate decreases. The structure of TiO₂particles in experiments was basically in anatase phase and the amount of rutile phase in TiO₂particles increases as the maximum flame temperature increases, or as the total gas flow rate decreases. However, the amount of rutile phase in TiO₂particles was almost independent of the inlet TiCl₄concentration. The specific surface area of TiO₂particles increases, as the flame temperature decreases.
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