ガスハイドレートペレットによる天然ガスの海上輸送の研究 : ガスハイドレートペレットの自己保存性に関する研究

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For the purpose of sea-borne transportation of stranded natural gas in the new form of gas hydrate, we examined experimentally several thermal properties of methane hydrate pellets (MHP) in bulk, which had been made by using methane hydrate production and pelletization trial machines for the research of high-speed mass production of natural gas hydrate pellets. (1) Temperature Influence on Self-Preservation Property of MHP in Bulk In order to examine correlation between temperature and self-preservation property of MHP in bulk during navigation, we designed and manufactured the experimental apparatus with which we could control the temperature of 50 pellets within approximately 0.1℃ of fixed temperature, and conducted MHP's dissociation experiments at atmospheric pressure with the fixed temperature varied between -25℃ and -5℃. As a result, we confirmed that the self-preservation property of MHP in bulk at atmospheric pressure reached its peak at around -20℃ in the present experiments. The results coincided qualitatively with those of the experiments for single pellet which had been conducted independently by Mitsui Engineering & Shipbuilding Co., Ltd. and Osaka University. (2) Compressive Load Influence on Self-Preservation Property of MHP in Bulk In order to verify whether or not the self-preservation property of MHP in bulk at sea is maintained at atmospheric pressure with either the influence of its own weight or that of the acceleration owing to ship motion and gravity, we examined dissociation behaviors of MHP in bulk with either static or repetitious compressive load weighted. As a result, we came to the following conclusions. (a) The influence of the static compressive load on MHP's dissociation is not significant, compared to that of absolute temperature. From the viewpoint of sea-borne transportation, therefore, it is reasonable to suppose that MHP's dissociation rate does not increase by significant degree owing to its own weight in ship cargo holds. (b) The influence of the repetitious compressive load on MHP's dissociation is not significant in the case of no more than 10,000 times of repetition number. On the other hand, we observed significant influence of 100,000 times of the repetitious load on MHP's dissociation. Taking that the data were obtained for a special condition into account, however, we may well conclude that the compressive load (owing to both ship's own weight and its motion during ordinary navigation) which acts on ship cargo does not have significant influence on MHP's dissociation.
独立行政法人海上技術安全研究所の論文
2005-09-26

ガスハイドレートペレットによる天然ガスの海上輸送の研究 : ガスハイドレートペレットの自己保存性に関する研究

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