COMの伝熱特性と沈降現象について

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Under the recent situation of energy, expand of variation of energy resources is emphasized and the coal utilization is reviewed again. One of them will be the practical introduction of COM (coal oil mixture) and MHI has built the COM tanker owned by Nippon COM Co., which is successfully carrying this special cargo of COM. COM should be maintained at a certain level of high temperature due not to reduce the fludity during transportation and to maintain the stability of COM particles in oil, and therefore heating and heat insulation system is necessary for COM tank. Since COM is, however, Bingham fluid which has very high viscosity, its heat transfer characteristics which derived from convection flow is not known well yet. Author did some empirical studies to research the convection characteristics of COM compared to those of water, and obtained the knowledge that the conduction largely governs the heat transfer mechanism in case of COM. According to this results author showed that some heating and insulation system is necessary for COM tank even for a short time period of voyage by theoretical analysis. On the other hand stability of coal particles in the oil is maintained by keeping the temperature and adding some materials of surfactunts, after losing the stability due to maintain at an unproper temperature or mechanical shock, coal particles start to sink toward the tank bottom. Dense layer of coal on the tank bottom is difficult to remove and interfere with the cargo unloading process. Author showed the simulation method of this sinking phenomena and good correlation between the actual data was obtained.
社団法人日本船舶海洋工学会の論文
1986-03-01

COMの伝熱特性と沈降現象について

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