[geo] Re: Sequestration

[markcapron]

Dan,

 

What is the starting point concentration for the $40 per ton to convert gaseous CO2 to liquid CO2?  The 400 ppm of atmosphere, the 10% of natural gas fuel exhaust, the 20% of coal fueled exhaust, or 100% CO2?  Starting from 100% CO2 only needs compression to about 60 bar at 10 degrees C with an energy cost of about 60 kWh per ton or about $6 per ton.

 

Thereafter one pumps the liquid against very little differential density.  If the end of the pipe were about 7,000 meters deep in seawater, it would syphon down from 600 meters deep.

 

Mark E. Capron, PE

Oxnard, California

www.PODenergy.org

 

 

-------- Original Message --------
Subject: [geo] Re: Sequestration
From: "Dan Whaley" whaley@gmail.com>
Date: Wed, September 10, 2008 7:27 pm
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED], [EMAIL PROTECTED],
geoengineering@googlegroups.com

Gene,

David Keith has been quite creative in his thinking about this, you might reach out to him.

The failed Hawaii project to do deep water injection is clearly a marker you would want to study in terms of what the environmental objections were.   The Statoil project for sub sea bed injection was approved by the IMO LC in 2005 i believe but abandoned since then for cost reasons.  Until the price of carbon gets to $60-80 / ton of CO2 you will not see a ton of revival here although CO2 injection for enhanced oil recovery is cost competitve and fairly widely deployed.  However this is not an ocean technique.  The big problem is that conversion of CO2 to liquid form costs at least $40 a ton straight off the top.

D

On Wed, Sep 10, 2008 at 3:55 PM, Ken Caldeira <[EMAIL PROTECTED]> wrote:

I was a Coordinating Lead Author of the IPCC chapter on that general topic.

See: http://www.ipcc.ch/pdf/special-reports/srccs/srccs_chapter6.pdf

Caldeira, K., M. Akai, P. Brewer, B. Chen, P. Haugan, T. Iwama, P. Johnston, H. Kheshgi, Q. Li, T. Ohsumi, H. Poertner, C. Sabine, Y. Shirayama, J. Thomson. Ocean storage. In: IPCC Special Report on Carbon Dioxide Capture and Storage. Prepared by Working Group III of the Intergovernmental Panel on Climate Change [Metz, B., O. Davidson, H. C. de Coninck, M. Loos, and L. A. Meyer (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 442 pp.

http://www.ipcc.ch/ipccreports/srccs.htm

On Thu, Sep 11, 2008 at 2:35 AM, Eugene I. Gordon <[EMAIL PROTECTED]> wrote:

As you all know carbon dioxide sequestration is a hot topic and would certainly play an important role in reducing AGW produced by our current electric power plant. Sequestration is mostly relevant to electric power generation with coal and natural gas, which constitutes about 70% of the U.S. electric power generation with nuclear making up another 19%. I think technology for capturing CO2 is not in question but how to get rid of it once it is captured is an issue.

Do any of you have knowledge of storing it at the bottom of deep ocean say at 18,000 feet where the water is always at 4 C and the pressure is about 7000 atms. Under such conditions CO2 will remain frozen. Getting it down there is not a big technology challenge. It would be a hazard for sea life at the bottom but it need not cover large parts of the ocean. The is plenty of deep ocean.

Any thoughts or comments?

 

-gene

 

--

===============================
Ken Caldeira
Department of Global Ecology
Carnegie Institution
260 Panama Street
Stanford, CA 94305 USA
+1 650 704 7212; fax: +1 650 462 5968

[EMAIL PROTECTED]

http://dge.stanford.edu/DGE/CIWDGE/labs/caldeiralab/



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