scholarly journals CO2 Ocean Sequestration and CO2 Hydrate.

2002 ◽  
Vol 12 (1) ◽  
pp. 40-49
Author(s):  
Izuo AYA ◽  
Kenji YAMANE ◽  
Ryuji KOJIMA ◽  
Sadahiro NAMIE
Keyword(s):  
Co2 Ocean Sequestration ◽  
Ocean Sequestration

Correlations among the design factors of the CO2 ocean sequestration system, GLAD

Energy ◽  
2005 ◽  
Vol 30 (11-12) ◽  
pp. 2308-2317 ◽  
Author(s):  
Kentaro Niwa ◽  
Sanai Kosugi ◽  
Takayuki Saito ◽  
Takeo Kajishima ◽  
Kenji Hamaogi
Keyword(s):  
Co2 Ocean Sequestration ◽  
Ocean Sequestration ◽  
Design Factors

A Eulerian-Eulerian Physical-Biological Impact Model of Zooplankton Injury Due to CO2 Ocean Sequestration

2004 ◽  
Vol 60 (4) ◽  
pp. 797-805 ◽  
Author(s):  
Baixin Chen ◽  
Yongchen Song ◽  
Masahiro Nishio ◽  
Makoto Akai
Keyword(s):  
Impact Model ◽  
Biological Impact ◽  
Co2 Ocean Sequestration ◽  
Ocean Sequestration

Experimental Study of Dissolution Rate of a CO2 Droplet and CO2 Solubility in High Pressure and Low Temperature Seawater With Hydrate Free

2004 ◽  
Author(s):  
Yongchen Song ◽  
Baixin Chen ◽  
Masahiro Nishio ◽  
Makato Akai
Keyword(s):  
Hydrate Formation ◽  
Co2 Concentration ◽  
Co2 Solubility ◽  
Dual Nature ◽  
Thermodynamic State ◽  
Complete Condition ◽  
Fundamental Relationship ◽  
Co2 Ocean Sequestration ◽  
Carbon Dioxide Co2 ◽  
Ocean Sequestration

Against the background of carbon dioxide (CO2) ocean sequestration technology, we investigated the solubility of CO2 in seawater at a thermodynamic state similar to that at an ocean depth of 1000 m. The experiment was performed in two steps. In the first step, we reexamined and modified the fundamental relationship between Sherwood (Sh) number and Rayleigh (Ra) number in a natural convective flow over an up-down CO2 droplet. We derived a new expression of the Grashof number for CO2 dissolution in water and seawater with the aid of the relation between the density of CO2 solution and CO2 concentration. In the second step, this new expression was applied to the estimation of solubility of CO2 from experiments examining the dissolution of an individual CO2 droplet in seawater at hydrate-formable pressure and temperature states. We found from our experiments: that (1) at hydrate-formable conditions (step two), no hydrate appeared at interface between liquid CO2 and seawater throughout the experiments within 5 hours, which suggested that a thermodynamic state (pressure and temperature) is indispensable but not a complete condition for hydrate formation; and (2) associated with this dual nature, the data of CO2 solubility estimated from this experiment are much larger than those obtained by Kimuro et al [1] from experiments of hydrate coexistence. Our data ranged from 0.052 to 0.062 in mass fraction.

A Lagrangian Two-Phase Model for Assessing the Near-Field Impacts of CO2 Ocean Sequestration

2006 ◽  
Author(s):  
Baixin Chen ◽  
Masahiro Nishio ◽  
Yongchen Song ◽  
Makoto Akai
Keyword(s):  
Near Field ◽  
Direct Injection ◽  
Deep Ocean ◽  
Injection Rate ◽  
Turbulent Dispersion ◽  
Two Phase ◽  
Liquid Co2 ◽  
Co2 Ocean Sequestration ◽  
Ph Reduction ◽  
Ocean Sequestration

A new version of a two-phase numerical model is developed to simulate CO2 droplet dissolution and the plume dynamics of CO2 enriched seawater produced by direct release of liquid CO2 into deep ocean from a towed pipe. This Lagrangian framework model consists of three sub-models. They are the CO2 droplet moving and dissolving sub-model, the turbulent dispersion of CO2 enriched seawater sub-model, and the biological impact sub-model. We performed simulations of direct injection of liquid CO2 from a release platform towed by a moving-ship into mid-depth seawater to examine the roles of injection parameters, including release platform type and initial CO2 droplet size. Results from the simulations show that a horizontal release platform can create a plume with less physical and biological impacts than a plume created by a vertical release platform. With an injection rate of 100kg/s, simulations predict that injection of small droplets (5mm in diameter) would produce up to 1.5 times the pH reduction of larger droplets (15 mm in diameter). This large pH reduction may significantly affect ambient zooplankton.

Numerical Simulation of Diffusion of CO2 Released by Thirty Ships in Mesoscale Deep Ocean

2009 ◽  
Author(s):  
Toru Sato ◽  
Taiki Iida ◽  
Se-min Jeong ◽  
Shinichiro Hirabayashi
Keyword(s):  
Carbon Capture ◽  
Direct Injection ◽  
Carbon Capture And Storage ◽  
Deep Ocean ◽  
Co2 Ocean Sequestration ◽  
Biological Impacts ◽  
Grid Technique ◽  
Ocean Sequestration ◽  
The Given ◽  
And Storage

Among possible carbon capture and storage methods to mitigate the global warming, the direct injection of CO2 into the deep ocean by the moving ship method, is considered to be a feasible way and expected to minimize its environmental impacts on marine organisms in the vicinity of the injection points. In this study, a simple but effective numerical model for the given practical scenario of very large system was developed with adopting moving and nesting grid technique and low-wavenumber forcing technique. The calculated results show that the maximum change of additional PCO2 is lower than a non-observed effect concentration, +5,000 μatm, in the both small and mesoscale domains. This indicates that the scenario of 30 ships with different length of injection pipes injecting total CO2 of 50 million t/yr and moving in the 110 × 330 km operation area is efficient and effective. The developed techniques demonstrated its efficiencies and applicability to give an outline for the optimization of the CO2 ocean sequestration system, by which biological impacts should be minimized and insignificant.

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