http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fly Ash를 이용한 흡수제의 SO_2/NO_x 동시제거
정종현,손병현,유경선,김현규,이형근 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
본 연구에서는 비산재를 첨가한 개량흡수제를 이용하여 황산화물과 질소산화물을 동시에 제거하기 위하여 고정층반응기 실험을 수행하였으며, 제조한 혼합흡수제는 SEM-EDX, ICP, BET, XRD 등을 이용하여 물성분석을 수행하였다. 소성한 석회석에 비산재를 혼합하여 수화시킨 'fly ash 개량흡수제'는 SO_2와 NO_x를 동시에 효율적으로 제거할 수 있었으며, 비산재를 첨가하여 제조한 개량흡수제가 첨가하지 않은 흡수제에 비하여 SO_2와 NO_x 동시제거에 더 효과적이었다. 이러한 실험결과는 석회석과 개량흡수제에 비산재의 첨가로 인하여 규산캄슘 등과 같은 수화물 생성으로 인하여 포졸란반응이 유도되어 'fly ash 개량흡수제'의 비표면적과 흡습성 등이 증가되었기 때문이다. 또한, 비산재를 SO_2 및 NO_x 동시제거용 첨가제로 활용하기 위한 비산재와 개량흡수제의 최적 첨가비율은 1:9인 것으로 나타났다. The simultaneous removal of SO_2 and NO_x by advanced absorbent from coal fly ash was examined in a packed bed reactor. Also, the physicochemical properties of prepared absorbents have been measured using ICP, BET, SEM-EDX and XRD. We have found that both SO_2 and NO_x in dimulated flue gas can be effectively removed by use of fly ash advanced absorbent which was prepared by hydration of calcined limestone with or without coal fly ash. The addition of fly ash into the absorbents can result in the highly efficient simultaneous removal of SO_2 and NO_x from simulated flue gas. This is because the addition of fly ash into limestone and advanced absorbent increases the specific surface area and hygroscopicity of fly ash advanced absorbents by pozzolanic reaction which leads to the formation of calcium silicate compounds. The test results indicated that the optimal mixing ratio of fly ash to advanced absorbent sample is about 1:9 for the effective removal of SO_x/NO_x.
김도현,박무인,유찬희,김규종,문원,박선자,장희경 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2
저자들은 65세 남자 환자의 위 중부체부 대만부 전벽에 발생한 점막하 종양에 대하여 3년간 추적관찰 중 크기증가소견으로 쐐기 절재술을 시행하였으며, 조직검사 및 면역 조직 화학 검사에서 위 신경초종으로 진단한 1예를 경험하였기에 보고하는 바이다. Gastric schwannoma is a very rare gastrointestinal benign tumor, which represents only 0.2% of all gastric tumors and 4% of all benign gastric tumors. We report a case of gastric schwannoma with enlargement of size through serial endoscopic examination. Endoscopic examination showed a hard mass of 4 x 3 cm in size with normal overlying gastric mucosa on the great curvature of the mid-body of stomach. The pathological finding revealed a picture of spindle cell tumor. Immunohistochemical stain was strongly positive for S-100 protein and non-reactive for CD34, C-kit and smooth muscle actin, thus leading to the diagnosis of gastric schwannoma.
Effects of Particle Size and Gas Velocity on Bulk Sulfation of Al₂O₃ Support in CuO/γ-Al₂O₃ Sorbent
Yoo, Kyung Seun,Kang, Soon Kook,Kim, Sang Done 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
The effects of particle size and gas velocity on sulfation of alumina support of CuO/ γ-A1₂0₃sorbent have been determined in a thermogravimetric analyzer (TGA). Sulfation rate of alumina support of CuO/ γ?-A1₂0₃ increases with increasing gas velocity up to 0.2 m/s and then decreases with a further increase in gas velocity. The bulk sulfation rate of alumina support decreases with decreasing particle size and sample weight. The slight increase of gas velocity enhances the sulfation rate via reduction of gas film resistance but the outward diffusion rate of SO3 also increases. As a result maximum rate of bulk sulfation appears at about 0.2 m/s. The concentration of SO3 in pores of CuO/γ?-A1₂0₃ pellet and bulk sulfation rate of alumina support decrease with decreasing particle size.
Kyung-Seun Yoo,Jong-In Dong,Jung-Ho Hwang,Hwa-Young Lee,Kyoon-Duk Yoon,Min-Seop Eom 한국대기환경학회 2007 한국대기환경학회 학술대회논문집 Vol.- No.-
Pyrolysis characteristics of various municipal wastes such as biomass and sewage sludge have been investigated in a fluidized bed reactor (0.1m I.D.×1.0m height). This study was performed to determine the effect of operating parameters such as temperature and U<SUB>o</SUB>/U<SUB>mf</SUB> on the generation of pyrolytic products. The optimum temperature for collecting bio-oil which can use renewable energy and valuable chemicals was 400℃. And the optimum U<SUB>o</SUB>/U<SUB>mf</SUB> conditions were 3.0 and 4.0. In optimum conditions, the maximum yield of bio-oil were collected from Quercus Acutissima, Larix Leptolepis and sewage sludge were 55wt%, 58wt% and 56wt%, respectively. Identified chemical components of bio-oil derived from biomass such as Quercus Acutissima and Larix Leptolepis were carbohydrates, furans, phenols, guaiacol and syringols. Lignin content of biomass affected the generation of guaiacol and syringol in bio-oil.