石炭運搬船における積荷の酸化発熱について

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A large quantity of powdered coal which tends to generate heat by its oxidation is overseas transported by many bulk carriers to accompany the increase of consuming coal gradually. It becomes a matter of great concern in the transportation of coal as bulk cargo that the quality of coal is fairly deteriorated by self-heating and the accidents of spontaneous combustion occasionally occur. Therefore, it needs to take measures to cope with preventing from excessive calorification of coal cargo by means of controlling the environment of the hold. The rate of heat generation of the fine coal depends upon its temperature and oxyzen concentration which could be expressed by the Arrheniuse's formula. In this paper, an analysis on the coal temperature and the gas concentration of oxyzen is carried out in order to investigate the heat diffusion problem of the packed particles with spontaneous heat generation by oxidation such as the coal in the cargo hold of ship. Firstly, the simplified formulae based on the thermal conductivity equation with self-heating source are introduced with a view to assume the accumulating process of generating heat. Secondly, the relations between the physical properties of coal, the geometry of cargo hold and the stored heat are clarified by executing a numerical two-dimensional analysis on the thermal coductivity with the change of oxyzen concentration using the iterative way based on Newton-Raphson's method.
社団法人日本船舶海洋工学会の論文
1988-03-22

著者

福地信義
九州大学工学部

石炭運搬船における積荷の酸化発熱について

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