title: CO2 hydrate formation and dissociation in cooled porous media: a potential technology for CO2 capture and storage.
abstract: The purpose of this study was to investigate the hydrate formation and dissociation with CO2 flowing through cooled porous media at different flow rates, pressures, temperatures, and flow directions. CO2 hydrate saturation was quantified using the mean intensity of water. The experimental results showed that the hydrate block appeared frequently, and it could be avoided by stopping CO2 flooding early. Hydrate formed rapidly as the temperature was set to 274.15 or 275.15 K, but the hydrate formation delayed when it was 276.15 K. The flow rate was an important parameter for hydrate formation; a too high or too low rate was not suitable for CO2 hydration formation. A low operating pressure was also unacceptable. The gravity made hydrate form easily in the vertically upward flow direction. The pore water of the second cycle converted to hydrate more completely than that of the first cycle, which was a proof of the hydrate "memory effect". When the pressure was equal to atmospheric pressure, hydrate did not dissociate rapidly and abundantly, and a long time or reduplicate depressurization should be used in industrial application.
authors.affiliation: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology , Dalian 116024, People's Republic of China.
authors.forename: Mingjun
authors.initials: M
authors.lastname: Yang
authors.forename: Yongchen
authors.initials: Y
authors.lastname: Song
authors.forename: Lanlan
authors.initials: L
authors.lastname: Jiang
authors.forename: Ningjun
authors.initials: N
authors.lastname: Zhu
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Yuechao
authors.initials: Y
authors.lastname: Zhao
authors.forename: Binlin
authors.initials: B
authors.lastname: Dou
authors.forename: Qingping
authors.initials: Q
authors.lastname: Li
mesh_terms: D000397:Air Pollution / Q000517:prevention & control; D001274:Atmospheric Pressure; D002245:Carbon Dioxide / Q000737:chemistry*; D052918:Environmental Restoration and Remediation; D017752:Greenhouse Effect / Q000517:prevention & control; D007700:Kinetics; D016062:Porosity; D011312:Pressure; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D002245:Carbon Dioxide