Ryo Kawai

Study on the generation system by thermal cycle of gas hydrate using a carbon cloth supported catalysts

In cold regions, because the heat demand is high in winter, greenhouse gas emission is an issue. In this study, we propose a new power generation system using a CO2 hydrate. This system uses the pressure variation properties of the CO2 hydrate under temperature changes. However, since the production speed of the CO2 hydrate is basically slow, efficiency of heat cycle of the system is decreased. Before now, increase in gas absorption of the CO2 hydrate is confirmed by using mixed powder of hematite and graphite (afterward iron oxide catalyst). Increase in gas absorption of the CO2 hydrate contributes to improvement for the efficiency of heat cycle of the CO2 hydrate. The subject of the present research devise improvement of the contact probability of three-phase interface of the CO2 hydrate for further improvement of gas absorption by microstructural carbon cloth support iron oxide catalysts.

Investigation of the heat cycleq of a CO2 hydrate using plate type heat exchangers

In cold climates, the high heat demand during winter calls for an especial attention on the development of new generation systems with low impact on the environment. Due to this, the development of a clean CO2 hydrate generation system which operates utilizing the expansion characteristics of the CO2 hydrate without burning any type of fossil fuels, and utilizing only the outdoor temperature of the cold district is being undertaken. To develop this type of clean generation systems, in this work, the basic characteristics of the thermal cycle of a CO2 hydrate is investigated by analyzing the pressure characteristics due to the internal temperature changes when the CO2 hydrate undergoes generation and dissociation processes by utilizing plate type heat exchangers for these processes.