Study on Characteristic of CO2 Hydrate Formation Using Micro-sized Ice

Gas hydrate is an inclusion compound consisting of water and low molecular weight gases, which are incorporated into the lattice structure of water. Owing to its promising aspect to application technologies, gas hydrate has been widely studied recently, especially CO2 hydrate for the CCS (Carbon Capture and Storage) issue. The key point of CO2 hydrate technology for the CCS is how to produce gas hydrate in an efficient and economic way. In this study, we have tried to study the characteristic of gas hydrate formation using micro-sized ice through an ultrasonic nozzle which generate 2.4 MHz frequency wave. CO2 as a carrier gas brings micro-sized mist into low-temperature reactor, where the mist and carrier gas forms CO2 hydrate under -55 degrees C and atmospheric pressure condition and some part of the mist also remains unreacted micro-sized ice. Formed gas hydrate was average 10.7 of diameter at average. The starting ice particle was set to constant pressure to form CO2 hydrate and the consumed amount of CO2 gas was simultaneously measured to calculate the conversion of ice into gas hydrate. Results showed that the gas hydrate formation was highly suitable because of its extremely high gas-solid contact area, and the formation rate was also very high. Self-preservation effect of CO2 hydrate was confirmed by the measurement of CO2 hydrate powder at normal and at pressed state, which resulted that this kind of gas storage and transport could be feasible using CO2 hydrate formation.