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소성 Dolomite 의 수화 및 탈수반응을 이용한 축열에 관한 연구
이수각,이영세,김종식 ( Soo Kag Lee,Young Sei Lee,Jong Shik Kim ) 한국공업화학회 1992 공업화학 Vol.3 No.3
본 연구에서는 소성 dolomite와 수증기계의 열화학 반응을 축열식열교환기에 응용하기 위해 충전층 형태의 실험장치에서 축열 및 방열특성에 관한 연구를 수행하였다. 실험 data는 수화반응온도 150-400℃, 탈수반응온도 700-800℃ 및 수증기 유량 294, 430, 567 g/hr의 실험조건에서 얻은 결과이다. 본 연구의 실험범위내에서는 소성 dolomite중 MgO가 수화반응 과정중 수화되지 않음을 알았다. 따라서 소성된 dolomite중 MgO는 불활성 물질로 취급할 수 있다. 또한 율속단계는 충전층의 입구와 벽면으로부터, 출구와 중심쪽으로 반응이 진행되므로 반응율속보다는 열전달율속으로 진행된 다고 생각된다. This study was carried out to investigate the heat-storage/-release characteristics of the thermochemical reaction of the calcined dolomite and steam system for the application of regenerative heat exchangers with the packed bed shape experimental apparatus. The experimental data were obtained at the following conditions ; the hydration temperature was 150-400℃, the dehydration temperature was 700-8OO℃ and the steam mass flow rates were 294, 430 and 567 g/hr. In the present study, it was found that MgO of the calcined dolomite was not hydrated during the hydration process under the studied experimental conditions. Therefore, MgO of the calcined dolomite can be regard as an inert material. Because the reaction was proceeded from the packed bed input to packed bed output and from wall to center, it could be thought that the rate determining step is not the reaction itself but the heat transfer.
화학반응을 이용한 축열식 열교환기의 축열 및 방열특성에 관한 연구
李壽珏 慶一大學校 1996 論文集 Vol.13 No.2
For the purpose of the development of storing heat materials in chemical, the present paper is concerned with the heat-storage/-release characteristics of a regenerative heat exchanger. The heat-storage/-release characteristics is numerically analysed by a methematical modeling. As a result, the effectiveness of the heat exchanger using the chemical reaction is considerably higher than that by the sensible heat.
고압에서 예혼합 CH<sub>4</sub>-Air 화염의 축소 반응 메카니즘
이수각,이기용,Lee, Su-Gak,Lee, Ki-Yong 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.6
에러 최소 연결 방법(SEM-CM) 및 반복적 화학종 제거 민감도를 적용한 반응 메카니즘 감소 방법을 갖고, 고압에서 메탄-공기 예혼합 화염에 대한 축소 반응 메카니즘을 개발하였다. 최대 5% 이내의 에러 조건에서 얻어진 축소 반응 매카니즘은 43개 화학종과 554개 기초반응식으로 구성되어 있다. 고압조건에서 다양한 초기온도, 당량비를 갖는 메탄-공기 화염에 대하여 상세 화학반응 메카니즘과 축소 반응 메카니즘으로부터 얻어진 화염구조는 비교되었고, 결과는 잘 일치하였다. 따라서 개발된 축소 반응 메카니즘은 고압에서 화염속도, 화염온도, 주 화학종 및 부 화학종의 농도 등을 재생할 수 있다. A short reaction mechanism for premixed $CH_4$-air flames at high pressure was developed using a reduction method based on the combined application of the simulation error minimization connectivity method and the iterative species-removal sensitivity method. It consisted of 43 species and 554 elementary reactions under the condition that it produces less than 5% of the maximum error. The flame structures obtained using a detailed reaction mechanism and the short reaction mechanism were compared for $CH_4$-air flames with various initial temperatures and equivalence ratios at high pressure, and the results were in good agreement. Therefore, the short reaction mechanism developed could reproduce the flame speeds, temperatures, and concentrations of major and minor species at high pressure.
Na₂S .5H₂O/Na₂S.nH₂O계의 반응평형 및 팽창흑연 제조법에 관한 연구
李壽珏 慶一大學校 1995 論文集 Vol.12 No.2
For the purpose of the development of storing heat materials in chemicals, the present paper is concerned with the equilibrium of NaS·5HO/NaS·nHO reaction system and the manufacturing method of expanded graphite. The manufacturing method of expanded graphite were experimentally examined from a fundamental point of view and the equilibrium of NaS·5HO/NaS·nHO reaction system was obtained by TGA unit.
가역 열화학반응을 이용한 축열에 관한 연구(Ⅲ) : 화학축열재의 반응특성 Reactivity of heat storage mateiral
이영세,김종식,이수각 계명대학교 산업기술연구소 1990 産業技術硏究所 論文報告集 Vol.13 No.2
For the purpose of chemical heat storage, in this study, the ractivities of ??/?? thermochemical reaction cycle were studied from a point of veiw with various kinds of limestone. The reaction rate of the thermochemical reaction cycle was measured using a micro-thermobalance equipped with steam generator. The experimental data was obtained at conditions : the reaction temperature 75-450℃, the reactant particle size under 5μm and the steam concentrations under 25vol. %. In the present study, it was found that the magnesium oxide of the calcined dolomite was not hydrated during the hydration process under the studied experimental conditions. The magnesium oxide of the calcined dolomite was regarded as an inert material for modeling reaction kinetics. The reaction rate constant for the hydration of CaO in the calcined dolomite was about 1.5times higher than that for the hydration of CaO in other calcined limestones, but the reaction rate for the dehydration of Ca(OH)₂is almost constant for all kinds of limestones.