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박주식,이시훈,최상일,양현수 ( Chu Sik Park,Shi Hun Lee,Sang Il Choi,Hyun Soo Yang ) 한국공업화학회 1997 공업화학 Vol.8 No.2
준역청탄, 유연탄, 무연탄 및 국내 무연탄을 포함하는 54종의 석탄회분을 대상으로 화학조성 및 광물분석 그리고 용융온도를 측정하여 화학조성이 용융온도에 미치는 영향을 고찰하였다. 석탄회의 구성 산화물중 CaO와 MgO, 그리고 Fe₂O₃가 용융온도를 낮추는 산화물임을 알 수 있었다. Fe₂O₃에 의한 용융온도 감소 효과는 환원성분위기에서 증가되었다. 산-염기도에서 염기 성분의 함량이 증가할수록 용옹온도는 감소하였다. 그러나 산-염기도와 용응온도와의 상관관계는 Fe₂O₃/CaO비가 증가함에 따라 낮아졌다. 산화성분위기보다는 환원성분위기에서 용융온도가 낮았으며 이때 분위기 변화에 따른 용융온도차는 Fe₂O₃ 함량보다는 SiO₂/Al₂O₃비와 밀접한 상관성을 보여주었다. 석탄회의 용옹온도(연화)를 예측하기 위한 다중회귀분석결과 산화성분위기에서는 Base/Acid, Fe₂O₃/CaO, SiO₂/Al₂O₃, (SiO₂/Al₂O₃) · (Base/Acid) 그리고 환원성분위기에서는 Base/Acid, Fe₂O₃/CaO, SiO₂, TiO₂등을 독립변수로 사용함으로써 비교적 상관성이 높은 관계식을 얻을 수 있었다. To study the effects of chemical composition on the fusion temperatures of coal ashes, the chemical composition, mineral matter, and fusion temperature were studied with 54 kinds of coal ash samples including Korean anthracite coals. CaO, MgO and Fe₂O₃ were observed to be major fluxing elements in reducing and oxidizing atmosphere. The fluxing effect of Fe₂O₃ was increased more in reducing atmosphere. In a base/acid ratio, the fusion temperature decreased with increasing amounts of basic components. Nevertheless, the correlation between a fusion temperature and base/acid ratio was not shown well in a higher ratio of Fe₂O₃/CaO. The differences of fusion temperatures between oxidizing and reducing atmosphere showed close relationship with SiO₂/Al₂O₃ ratio rather than with Fe₂O₃ contents. Multiple regression was used to predict the fusion temperature of coal ashes, and it was established that the major predictors in oxidizing atmosphere were Base/Acid, Fe₂O₃/CaO, SiO₂/Al₂O₃, and (SiO₂/Al₂O₃)·(Base/Acid) and Base/Acid, Fe₂O₃/CaO, SiO₂and TiO₂ were major ones in reducing atmosphere.
Pertroleum Cokes 의 화학적 처리에 의한 황성분 및 회분제거에 관한 연구
한웅,이시훈,박주식,양현수 ( Woong Han,Si Hyun Lee,Chu Sik Park,Hyun Soo Yang ) 한국공업화학회 1996 공업화학 Vol.7 No.6
MCL(Molten Caustic Leaching) 처리는 알카리에 의해 황성분 및 회분을 제거할 수 있도륵 유용하게 개발된 화학적 정제공정이며, Si, Fe, V, Ni 등과 같은 무기물을 수용성 염으로 전환을 시켜 제거한다. 그리고 MCL은 다른 탈황 공정보다도 탄소손실을 최소로할 수 있는 장점이 있다. 본 연구에서 황성분 및 회분제거에 대한 반응변수로는 침출온도, 침출시간, NaOH/cokes 비율, 산세정 농도와 세정 시간 그리고 입자크기 등이었다. 최적의 조건에서 MCL 처리를 한 결과 황성분과 회분은 각각 99%와 90%가 제거되었으며, 이때 FT-IR과 SEM의 결과에서 petroleum cakes 입자의 구조 및 표면변화는 침출온도 및 황성분과 회분의 제거율에 밀접한 관계를 나타내었다. An MCL(Molten Caustic Leaching) treatment is a chemical refinery process which is used for the desulfurization and demineralization by alkali treatment. The MCL treatment removes ash by converting mineral like Si, Fe, V, Ni etc. in petroleum cokes into soluble salts. The MCL has an advantage minimizing carbon loss in comparison to other desulfurization process. Reaction variables for the desulfurization and demineralization in the study were leaching temperature, leaching time, ratio of caustic to cokes, acid concentration and time for washing, and particle size. At the optimum condition, above 99% of desulfurization and about 90% of demineralization was obtained. FT-IR and SEM analysis showed that the structure and surface of the particle was closely related with the degree of sulfur and ash removal, and leaching temperature as well.
용융 NaOH 침출을 이용한 Petroleum Cokes 의 탈황에 관한 연구
한웅(Woong Han),이시훈(Si Hyun Lee),박주식(Chu Sik Park),양현수(Hyun Soo Yang) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
Molten Caustic Leaching, one of the methods of treatment with alkali metal compound, was applied to the desulfurization of petroleum cokes which are produced in Korea. In removing the sulfur, the effects of reaction variables such as reaction temperature(400-550℃), reaction time(10-60 min), ratio of caustic to cokes(0-5 wt/wt), acid washing concentration(0-5 N), acid washing time(10-40 min) and particle size(under 14 mesh) were investigated. The best desulfurization efficiency was obtained after 30 minutes with reaction temperature of 550 ℃ at which the efficiency was above 99 % and ash removal was slightly less than 90 %. Changes in surface and organic structure were also investigated by using the SEM and FT-IR spectrometer.
Chemical-Looping Combustion을 위한 금속산화물 매체들의 산화 환원 반응특성
이진배,송영욱,박주식,최상일,김영호,양현수 忠南大學校 産業技術硏究所 2003 산업기술연구논문집 Vol.18 No.2
Chemical-looping combustion has been focused as a very promising combustion technology from the viewpoint of high energy efficiency, easy separation of CO_(2) and no formation of NO_(x). The key of this combustion technology is to develop oxygen carrier mediums with high oxygen capacity, and high machanical and thermal stability. In this study, various kinds of mediums were prepared by the combination of active metal oxides, such as NiO, CoO, Fe_(2)O_(3) or NiO-Fe_(2)O_(3), with YSZ(yttria stabilized zirconia) as a binder. The redox reactions on the mediums were also carried out by using the thermogravimetric reactor. The redox reaction rates on a NiO/YSZ medium were found to be most superior in comparison with those of other mediums. In addition, durability of the medium was also found to be appropriate for UC. For the purpose of high redox reaction rates, the optimum reaction temperatures of reduction and oxidation on a NiO/YSZ medium were observed as 600℃ and l000℃, respectively.