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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.
Optimization of fire-related properties in layered structures
박원희 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
In present paper, fire-related properties of materials with multilayered structure are obtained through reverse heat transfer analysis. For this purpose, one-dimensional heat transfer equation including pyrolysis is analyzed to simulate the fire phenomenon of multi-layered solid materials. The fire-related properties can be obtained by optimizing the objective function expressing the difference between the measured values and the results (surface temperature and mass loss rate under constant incident heat flux) obtained by analyzing the considered heat transfer equations. Repulsive particle swarm optimization is used as the optimization technique. The optimized properties of single-, two- and three-layered materials obtained with the assumed properties were compared to the assumed for various incident heat fluxes. Using a cone calorimeter, the surface temperature and mass loss rate were measured over time with three constant heat fluxes applied to three layers of sandwich type material. The fire-related properties of each layer of the sandwich type material were calculated using the measured results. The technique considered in this study can be applied for determining the fire characteristics of multilayered materials is suitable for engineering the necessary properties to predict fire propagation in solid material.