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홍성안,박원훈 한국화학공학회 1978 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.16 No.6
회분이 많은 국산 무연탄 연탄의 연소기구를 구명키 위하여 수식모델을 세우고 그 해석을 통하여 실제 시스템에 적용이 가능함은 제시하였다. shrinking core model을 쓰고, 이동경계면 표면에서 는 2C+O₂→2CO 반응만이, 회분층에서는 2CO+O₂→2CO₂ 반응이 일어난다고 할 때 위의 두 반응을 각기 대변하는 두개의 reaction modulus로서 연탄의 연소기구를 완전히 나타낼 수 있다. 일산화탄소의 농도 예측을 제외하고는 회분층에서의 재연소반응을 무시하여도 즉 산소의 확산에 지배된다고 가정하여도 연소특성의 설명에는 큰 영향이 없음을 보였다. A mathematical modeling of combustion mechanism of Korean high-ash anthracite briquette is developed and analysed to show its applicability to the actual system, The shrinking core model is chosen. With the assumption of 2C+O₂=2CO reaction only at the moving boundary surface and 2CO+O₂=2CO₂ reaction in the ash layer, the whole mechanism can be described by two reaction moduli representing above reactions, respectively. The actual briquette burning characteristics are shown to be predicted without considering the oxidation reaction of carbon monoxide in the ash layer, in other words, with assuming oxygen diffusion control. For carbon monoxide concentration profile, ash layer reaction should be included.
홍성안,남석우 ( Seong Ahn Hong,Suk Woo Nam ) 한국공업화학회 1992 공업화학 Vol.3 No.4
The molten carbonate fuel cell(MCFC) has been under intensive development for the last decade as a second generation fuel cell. The advantages of the MCFC over the phophoric acid fuel cell are higher efficiency, its ability to accept CO and H₂ as a fuel, lower material costs, and high operating temperature making internal reforming possible. These features, along with low atmospheric emissions, will open up a significant market as an attractive means of developing highly efficient power plant. This article reviews a status of the MCFC research and development, a principle of the MCFC, and cell and stack technology including the status of electrodes, matrices and electrolytes. Several technical difficulties which must be resolved to be commercialized are mainly focused.
홍성안,김호기 한국화학공학회 1975 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.13 No.6
반응기 입구농도에 계단 입력을 주었을 때 과도응답을 측정함으로써 연속식 탱크 반응기의 비 이상 혼합효과를 조사하였다. 탱크의 레이놀즈수가 17을 넘으면 들어가는 유량의 난류만으로 완전혼합을 얻을 수 있었고 17이하에서는 임펠라의 직경을 기준으로 한 레이놀즈수의 최소치를 탱크의 레이놀즈수와 관련시켜 Re_m=540ln(17/R_(et))의 관계식을 얻었다. 입구관과 출구관을 넘쳐흐르는 수위와 일직선으로 했을 때 by passing효과를 조사했고 비이상 흐름에서는 여러가지의 mixed model로써 흐름의 pattern을 나타냈다. Nonideal behaviour of a continous flow stirred tank reactor was investigated by observing the transient response of the reactor to step changes in feed concentration. It was shown that the turbulence caused by inlet flow only was sufficient for perfect mixing provided that the tank Reynolds number exceeded 17. For the tank Reynolds number below 17, mechanical stirring was necessary and the Reynolds number based on the impeller diameter for perfect mixing was correlated to the tank Reynolds number as follows: Re_m=540ln(17/Re_t) It was also found that bypassing effects became more significant when the feedline and effluent line were placed near the liquid levels. For nonideal flows, several mixed models described the flow patterns, namely bypassing and dead space model, CSTR and PFR in series model, and dead space model.