Development of new stable geological sequestration technique by nanoscale CO2

• Project/Area Number: 26420138
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Uemura Suguru 東京工業大学, 工学院, 特任准教授 (70515163)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: CO2地中隔離 / 多孔質内二相流 / 二酸化炭素地中隔離

Outline of Final Research Achievements

In this study, a new CO2 geological sequestration technology that employs nanosized CO2 injection was proposed in order to improve the storage stability, and the fundamental mechanism was clarified.
As a result of the X - ray visualization analysis, it was found that nanoscale CO2 spread homogeneously in the porous media, and permeated in the pore uniformly.After injection of nanoscale CO2, it was also observed that the CO2　moved up in the porous media approximately 4 mm / min. However, numerical analysis using Lattice Boltzmann method (LBM) showed that when the CO2 droplet diameter increases to micro scale, it is stably trapped in the pore by interfacial tension.