| Project/Area Number |
07640581
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Meteorology/Physical oceanography/Hydrology
|
|---|
| Research Institution | Kumamoto Institute of Technology |
|---|
Principal Investigator |
KOBAYASHI Yoshihiro Kumamoto Institute of Technology, Dept.of Technology, Professor, 工学部, 教授 (00234857)
|
|---|
| Project Period (FY) |
1995 – 1997
|
| Project Status |
Completed (Fiscal Year 1997)
|
| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
|
|---|
| Keywords | Global warming / CO_2 hydrate / CO_2 diffusion / CO_2 injection into sea / CO_2 diffusion coefft / CO_2 / H_2O interface / Density of CO_2 solution / Power generation by CO_2 liquid / CO_2深海投入 / 水和物 / 深海投入 |
|---|
| Research Abstract |
Theoretical and experimental studies have been carried out on the physical behavior of CO_2 under the high pressure and low temperature corresponding to the deep ocean of 3000m depth level focusing on the liquid CO_2. Simultaneously the studies of the injection system of CO_2 into the deep ocean result in the conceptual design of new sophisticated devices aiming at a satble transfer and injection of CO_2 and CO_2 hydrate. CO_2 directly contacting with sea water will be diffused into sea water or hydrate will be formed at the interface of CO_2/water. In this study a pressure and temperature in the deep sea was produced in the pressure vessel then the following facts were observed at the interface of liquid CO_2 and water (1) Instant formation of hydrate film but very slow growth of it (2) Asseleration of formation by stirring the interface (3) Prompt dissolution of hydrate by collapsing a pressure or temperature from an equilibrium conditions accompanying a rapid temperature decrease (4) Hydrate once formed is very stable unless current shear force is imposed. In a pressure vessel of 50-300atm containing liquid CO_2 and water, three principal coefficients of molecular diffusion in water, mass transfer at interface and density change of CO_2 solution have been calculated by using the CFD program developed for this research analyzing the change of CO_2 concentration distribution with time. Basic research of power plant utilizing the low temperature of liquid CO_2 has also been carried out. Further research in future of (1) Longer range pursuit of hydrate change (2) Diffusion from gas CO_2 (3) Diffusion and hydrate on a particle of liquid CO_2 are kept in mind.
|
