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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.
김종식,이수각,가곡창신,이영세 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.6
화학적 열저장을 할 목적으로 본 연구에서는 기초적인 관점에서 반응 출발물질로 여러 가지 석회석을 시료로 사용하여 Ca(OH)₂/CaO계 열화학 반응사이클에 있어서 반응성에 대한 연구를 수행하였다. 이 열화학 반응사이클의 반응속도는 수증기 발생장치가 부착된 미량 열천칭에 의해 측정하였다. 실험 데이터는 반응온도 75-450℃,시료의 평균입경 5㎛이하, 수증기 농도 25vol.%이하의 실험조건에서 얻은 결과이다. 본 연구의 실험범위내에서는 소성된 dolomite중 산화 마그네슘이 수화과정중에 수화되지 않음을 알았다. 따라서 소성된 dolomite중 산화마그네슘은 반응과정의 수학적 모델링에서 불활성 물질로 취급할 수 있었다. 또한 소성 dolomite중 CaO의 수화반응에 대한 반응속도 상수는 다른 소성된 석회석중의 그것에 비해 약 1.5배 정도 높은 값을 나타내었으며, Ca(OH)₂ 탈수반응의 반응속도는 모든 종류의 석회석이 거의 일정함을 알 수 있었다. For the purpose of chemical heat storage, in this study, the reactivities of Ca(OH)₂/CaO thermochemical reaction cycle were studied from a fundamental point of view with various kinds of limestone. T'he 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 5㎛ and the steam concentrations under 25 vol.%. 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 fur modelling reaction kinetics. The reaction rate constant for the hydration of CaO in the calcined dolomite was about 1.5 times higher than that for the hydration of CaO in other calcined limestones, but the reaction rate fur the dehydration of Ca(OH)₂ is almost constant for all kinds of limestones.
김종식,이수각,이영세 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.1
본 연구에서는 난류역 완전방해판 조건하의 교반소요동력을 기왕의 연구자의 결과와 본 실험결과와의 비교, 검토를 행하였으며 양호한 동력상관식을 제시한다. N_p=7.09(n_p)^(0.7)(b/d)(H/D)^(0.18) n_p^(0.7)(b/d)<1 N_p=7.09{(n_p)^(0.7)(b/d)}^(0.7)(H/D)^(0.18) n_p^(0.7)(b/d)≥1 또한 교반 impeller 부착위치에 따른 동력수의 추산식을 제시한다. N_(p(min))=N_(p(max))-2.47n_p^(1.32)(b/d)^(1.71) n_p^(1.32)(b/d)^(1.71)≤2.87 N_(p(min))=N_(p(max))-7.06 n_p^(1.32)(b/d)^(1.71)>2.87 In the present study, power input in the totally baffled agitated vessels was compared systematically in connection with several previous studies and adequate power input correlation was found to be: N_p=7.09(n_p)^(0.7)(b/d)(H/D)^(0.18) for n_p^(0.7)(b/d)<1 N_p=7.09{(n_p)^(0.7)(b/d)}^(0.7)(H/D)^(0.18) for n_p^(0.7)(b/d)≥1 Power number correlation was also formulated experimentally, which was dependent upon the position of the impeller in the stirred vessels, as follows: N_(p(min))=N_(p(max))-2.47n_p^(1.32)(b/d)^(1.71)for n_p^(1.32)(b/d)^(1.71)≤2.87 N_(p(min))=N_(p(max))-7.06 for n_p^(1.32)(b/d)^(1.71)>2.87
정수열,류종하,이수각,김종식 계명대학교 산업기술연구소 1993 産業技術硏究所 論文報告集 Vol.16 No.1
The effective use of energy is indispensably needed in our country absolutely for lack of energy source as the consumption of energy is greatly and rapidly increased. Accordingly, with the development of substituting energy for the prohibition of CO₂, the technique development of heat storage method is being studies in various ways to use the waste thermal energy which is not sufficiently used, or solar heat, etc. In this study, classify the heat storage system into sensible heat, latent heat and chemical heat storage, etc. , and describe the whole study situation of heat storage regarding each principle, usage, characteristic, and its vision.
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.