Investigation of CO2hydrate generation characteristics based on the development of a power generation system using atmospheric heat

This research aims at the development of a power generation system with low environmental load using the dissociation and expansion characteristics of CO
₂
hydrate. The proposed power generation system drives the actuator by making use of large pressure difference in the generation and dissociation reaction of CO
₂
hydrate caused by small temperature difference of several tens of degrees. In this study, CO
₂
hydrate generation and dissociation tests are carried out using reaction vessels with different thermal conductivity, and the CO
₂
hydrate generation characteristics are compared by examining the CO
₂
hydrate generation amounts. In addition, an increase in the power generation amount of the proposed system is analyzed. Experiments were conducted to examine the production experiment of CO
₂
hydrate to measure the amount of CO
₂
hydrate production and experiments simulating the proposed system using reaction vessels and buffer tanks. A stainless steel cylindrical device (thermal conductivity 20.9 W/(m·K)) and a copper cylindrical device (thermal conductivity 402 W/(m·K)) were used for the reaction vessel. By using two reaction vessels, we investigate the amount of CO
₂
hydrate produced and the efficiency of dissociation due to the difference in thermal conductivity. As a result of the survey, it was confirmed that increasing the thermal conductivity of the reaction vessel increases the CO
₂
hydrate production by about 67% and the CO
₂
hydrate dissociation efficiency increases by about 1 %. Therefore, as one method to increase the power generation amount of the proposed power generation system, it is possible to increase the thermal conductivity of the reaction vessel.