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Decomposition behaviors of methane hydrate in porous media below the ice melting point by depressurization

Chinese Journal of Chemical Engineering 2019年第9期27卷 2207-2212页

作者： Yu Zhang Tian Wang Xiaosen Li Kefeng Yan Yi Wang Zhaoyang Chen Guangzhou Institute of Energy Conversion Key Laboratory of Gas HydrateChinese Academy of SciencesGuangzhou 510640China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640China Guangzhou Center for Gas Hydrate Research Chinese Academy of SciencesGuangzhou 510640China University Science&Technology of China Nano Science&Technology InstituteSuzhou 215123China

The decomposition behaviors of methane hydrate below the ice melting point in porous media with different particle size and different pore size were *** silica gels with the particle size of 105–150μm,150–200μm and 300–450μm,and the mean pore diameters of 12.95 nm,17.96 nm and 33.20 nm were used in the *** recovery and temperature change curves were determined for each *** hydrate decomposition process in the experiments can be divided into the depressurization period and the isobaric *** temperature in the system decreases quickly in the depressurization process with the hydrate decomposition and reaches the lowest point in the isobaric *** hydrate decomposition in porous media below ice-melting point is very fast and no self-perseveration effect is *** hydrate decomposition is influenced both by the driving force and the initial hydrate *** the experiments with the high hydrate saturation,the hydrate decomposition will stop when the pressure reaches the equilibrium dissociation *** stable pressure in the experiment with high hydrate saturation exceeds the equilibrium dissociation pressure of bulk hydrate and increases with the decrease of the pore size.

关键词： Methane hydrate Depressurization Porous media Decomposition ice-melting point

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Applicability of Air Bubbler Lines for ice Control in Harbours

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China Ocean Engineering 2007年第2期21卷 215-224页

作者：潘华辰 Esa ERANTIb The Institute of Mechatronic Engineering Hangzhou Dianzi University Eranti Engineering Oy Harjuviita 6 AFIN-02110 EspooFinland

ice formation in the harbours in arctic region such as in Finland is a problem in winter times. The air bubblers are often used for controlling the growth of ice near the harbour pier walls. This paper gives an in-depth description of the harbour ice problem and the applicability of the bubblers. A numerical method of flow and heat-transfer is used to predict the effectiveness of the air bubblers in controlling the ice accumulation in the harbours. Empirical models of formatting and melting the ice are presented and used in the numerical solutions. It shows that the numerical method can realistically predict the ice-melting effect of the air bubblers.

关键词： ice-melting harbour bubbler heat transfer

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