Abstract
In order to make effective use of biogas generated in a sewage treatment plant in cold and snowy districts, more efficient storage can be expected with gas hydrate formation. In this study CO_2-hydrate formation in crushed ice layer was tried with an enclosed pressure vessel, assuming the combination of snow ice and biogas. On the other hand, much difference of the hydrate formation time on every experiment was obtained and various conditions of ice melting would be predicted as the cause. To clarify the effect the experiment was achieved with cooling vessels for hydrate formation and with addition of cooled grass beads. As one of the results their cooling methods gave stability on the formation and shortage of the duration. Higher formation speed was also expected if the ratio of melting enthalpy, defined as the formation possibility, reached around 30%.
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