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Molybdenum Trisulfide 의 유동배소에 관하여
박원희,정종인 한국화학공학회 1967 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.5 No.1
The fluidized bed roasting of molybdenum trisulfide cake which is a by product at the chemical processing plant of tungsten ore in Sangdong, Korea has been studied. The molybdenum trisulfide cake with an organic bridging liquid was agglomerated into spherical granules in a rotating drum. The agglomerated granules with 35 to 200 mesh in size were roasted in a fluidized bed using preheated air. Under the constant air temperature condition, the effect of granule size and bed height on the degree of desulfurization were investigated, and it was found that the granules with 150 to 200 mesh and the bed with 9.75 ㎝ height, 1½ times of the bed diameter, gave the best results. Near 1000℉ of bed temperature, the bed became defluidized and sintered. However, at lower bed temperature than 1000℉, could the granules be dead roasted. It was concluded that the proposed agglomeration fluidized-roasting method could be applied to molybdenum trisulfide cake in the large scale.
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박원희,이인철,박원훈,이현구 한국화학공학회 1981 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.19 No.4
가정용 구멍탄과 동일한 조성을 갖는 석탄배합물을 대상으로 연소실험을 실시하여 그 연소특성을 규명하는 한편, 연소모델을 제시하고 그 해석 결과를 실험관측과 비교 검토하였다. 연소시료는 구형으로 성형하여 열천칭으로 감량곡선을 측정하였으며 반응온도, 공기의 공급유량 및 시료크기 등 주요인자들이 연소특성에 미치는 영향을 분석하였다. 미반응 석탄표면에서 일산화탄소의 생성, 회분층내에서 일산화탄소의 재연소반응과 각 성분에 대한 확산저항 그리고 입자 외부의 물질전달저항을 고려하여 수축핵 모델을 설정하고 이론적인 해석을 시도하였다. 모델해석의 결과는 실험관측과 어느 정도 일치되는 경향을 나타내었으나 비등온 효과를 고려하여 모델을 더 개선할 필요가 있음을 제시하였다. An experimental study was performed for the combustion of coal mixture having the same composition as the anthracite briquette in domestic use. A mathematical model was also proposed and the results of theoretical analysis were compared to the experimental results. The purpose here is to investigate the combustion characteristics of the anthracite briquette and to develop a relevant mathematical model. Using a spherical sample, we measured the weight change as a function of reaction time by virtue of a spring thermo-balance. Examined and discussed here are the effects of major parameters on the combustion characteristics such as reaction temperature, flow rate of air, and sample size. A shrinking core model was established by taking into account the generation of carbon monoxide on the surface of unreacted core, the oxidation of carbon monoxide in the ash layer and the diffusional resistance through the ash layer as well as the external mass transfer resistance. The result of model analysis reveals that, although the overall trend is in agreement with the experimental observations, it would be necessary to improve the model by considering the non-isothermal aspect of the combustion system.
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