论文信息 - STUDY ON CO2 RELEASING NOZZLE FOR CO2 OCEAN STORAGE

STUDY ON CO2 RELEASING NOZZLE FOR CO2 OCEAN STORAGE

Ocean storage of CO2 is one of greenhouse gas control technologies, where CO2 captured from flue gas of fossil fuels is injected into deep sea below 3500m depth to be sequestered from the atmosphere. A CO2 sending method, COSMOS, was proposed as a method of ocean storage, which enables CO2 drops released in mid-depth water to descend to deep sea floor below the depth of 3500m. Then, the authors have worked for development and evaluation of COSMOS. In the first phase of the COSMOS project, the concept of COSMOS was demonstrated by in situ experiments of small-scale CO2 releasing at mid-depth water in Monterey Bay, U.S.A. Three models of CO2 releasing nozzle unit were developed for the experiments. The first model of nozzle unit released liquid CO2 as one mass; however, it was immediately broken into small droplets and soon turned to ascend. The second and third models were designed to have thermal insulator enough to keep low temperature so that both models successfully released liquid CO2 with dry ice, which continued descending for a few minutes. Based on these results, COSMOS was improved, where injection of a mixture of liquid CO2 and dry ice, CO2 slurry, is expected to enable small CO2 drops to descend to deep sea floor below 3500m depth. Then, in the second phase of the COSMOS project, the authors started an investigation on the effect of the aspects of releasing nozzle on the behavior of released slurry drops, and obtained a few results from lab experiment of CO2 slurry releasing from two types of nozzle head.Copyright © 2006 by ASME

[1] N. Nishikawa,et al. Stability of liquid CO2 spheres covered with clathrate film when exposed to environment simulating the deep sea , 1995 .

[2] Izuo Aya,et al. A field study of the effects of CO2 ocean disposal on mobile deep-sea animals , 2000 .

[3] S. Hirai,et al. Transport phenomena of liquid CO2 in pressurized water flow with clathrate-hydrate at the interface , 1996 .

[4] H. Teng,et al. Dissolution of CO2 droplets in the ocean , 1997 .

[5] N. Nishikawa,et al. CO2 clathrate formation and its properties in the simulated deep ocean , 1992 .

[6] C. Marchetti. On geoengineering and the CO2 problem , 1977 .

[7] E. Peltzer,et al. Direct experiments on the ocean disposal of fossil fuel CO2 , 1999, Science.

[8] Izuo Aya,et al. Experiments on the ocean sequestration of fossil fuel CO2 : pH measurements and hydrate formation , 2000 .

[9] T. Ohsumi,et al. Density change of water due to dissolution of carbon dioxide and near-field behavior of CO2 from a source on deep-sea floor , 1992 .