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CO2 에 의한 Char 의 가스화반응시 세공구조 변화
김광호,이선희,조병린,장윤호 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.6
CO₂ 가스화반응에 의해 얻은 호도각 char의 겉보기밀도, 세공반경분포, 세공용적 및 비표면적 등을 추정하여, 가스화방응시 반응온도와 전환율에 따른 char의 세공구조 변화를 조사하였으며, 이론모델(pore volume model, random pore model)과 비교하였다. CO₂ 가스화반응에 의해 형성된 호도각 char는 10Å(micro pore)과 10⁴Å(macro pore) 부근의 세공이 잘 발달된 이원적 구조를 가지고 있었다. 반응 온도가 낮을수록 char의 비표면적과 micro pore 용적은 증가하였으나 macro pore 용적은 변하지 않았으며, random pore model이 가스화반응에 의해 얻은 char의 세공구조값과 비교적 잘 일치하는 것을 알 수 있었다. A char was made from walnut shell which was gasified in CO₂ 7atmosphere and its physical properties such as pore size distribution, density, pore volume and surface area were measured. The effects of reaction temperature and conversion(X_c) on the pore structure change of char were examined and compared with the theoretical values from ihe mathematical modets (pore volume model and random pore model). The char which has bimodal pore distribution near by 10Å (micro pore) and 10⁴Å (macro pore) was obtained by CO₂ gasification reaction. At lower reaction temperatures the surface area (㎡/g-s.m.) and the micro pore volume (㎤/g-s.m.) were increased but the macro pore volume was not affected by the reaction temperatures. It was found that the random pore model was agreed with the pore structure data which were obtained from gasification of the char.
충전층의 높이 및 충전재의 형상에 따른 제습성능에 관한 연구
김광호,김경철 동의공업대학 1998 論文集 Vol.24 No.1
The goal of experiments in this paper is to obtain the fundamental data for the optimal condition by using a model dehumidifier. In particular, it was known the contact area and contact time between LiCl solution and the humid air influenced on the dehumidification efficiency. So this experiments were conducted by changing the air velocity and the flow rate of solution on packed layer height and packed materials type which affected the dehumidification efficiency. From the experiments, the following were obtained as conclusion. In the packed materials type. ceramic A type had the most dehumidification ratio and in the packed layer height, height 40cm had the most dehumidification ratio.
김광호,박태안 동의공업대학 1998 論文集 Vol.24 No.1
The goal of experiments in this paper is to obtain fundamental data for optimal conditions using a model dehumidifier. From the experiments, it was clarified that the dehumidification rate depended on the contacting area size, air volume, flow rate, and conditions of the inlet air and the LiCl solution, In particular, it was known that the contact area between the LiCl solution and the humid air, which was mainly determined by the spraying condition, influenced on the dehumidification rate. Consequently, dehumidifying performance is much dependent on the spraying device. As a result, the necessity to develop an optimal spraying device was recognized to fabricate a different type of sprayer for uniform distribution of solution over the packed layer. Experiments were conducted by changing the air velocity and the flow rate of solution. From the experiments, the following were obtained as conclusions: 1) The superior dehumidifying performance was obtained by using the newly developed spraying device. As a result, it was made clear that the new spraying device was more effective than that of the previous one and was suitable for dropping the high viscosity solution. 2) It was found that the over-all absorbing potential, (G/Q*(Xai - XLi)), including some parameters, which affects the dehumidification rate, can be an esimation standard of dehumidifying performance.