Notices
Results 1 to 5 of 5
Like Tree2Likes
  • 1 Post By Daecon
  • 1 Post By Ken Fabos

Thread: Greenhouse gas disaster?

  1. #1 Greenhouse gas disaster? 
    Forum Radioactive Isotope skeptic's Avatar
    Join Date
    Nov 2008
    Location
    New Zealand
    Posts
    4,843
    New Scientist 15 February page 36.

    A proposal to create lots of gas for energy. Turns out that the most common fossil fuel is coal, and no more than 30% of coal beds are accessible to conventional mining, due to cost, hazards etc. For example, there are extensive coal beds under shallow seas. But this proposal will permit extraction of energy in vast amounts from these difficult coal beds.

    If you burn coal, in the middle of a coal bed, with minimal oxygen, the heat of combustion will also drive off lots of volatile and flammable gases. These can be extracted by sucking them up a pipe, and then a suitable refinery can turn them into useable methane and other materials. So the plan is to drill pipes into the inaccessible coal beds. Air is pumped down one pipe, and the coal set afire. Other pipes suck up the volatiles.

    Obviously this will make vast amounts of the greenhouse gas, CO2. So they plan to pump the CO2 back down into the area which was coal, but is now open due to the coal being burned. They even suggest the volatiles be burned to generate electricity, and the waste CO2 sent back down into the coal bed.

    What do you guys think of this plan?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Professor Daecon's Avatar
    Join Date
    Jul 2013
    Location
    New Zealand
    Posts
    1,276
    What are we going to do when all the coal runs out?

    Whatever the plan is, why don't we just do that to begin with?


    danhanegan likes this.
    Reply With Quote  
     

  4. #3  
    Forum Professor
    Join Date
    Aug 2013
    Location
    San Diego
    Posts
    1,989
    Quote Originally Posted by skeptic View Post
    If you burn coal, in the middle of a coal bed, with minimal oxygen, the heat of combustion will also drive off lots of volatile and flammable gases. These can be extracted by sucking them up a pipe, and then a suitable refinery can turn them into useable methane and other materials. So the plan is to drill pipes into the inaccessible coal beds. Air is pumped down one pipe, and the coal set afire. Other pipes suck up the volatiles.
    They've been doing this for 50 years in Centralia, PA. It didn't turn out so well for them.
    Reply With Quote  
     

  5. #4  
    Forum Masters Degree
    Join Date
    Jul 2010
    Location
    Australia
    Posts
    719
    What are the net GHG emissions and climate implications? I don't see anything to suggest that this is about replacing higher emissions coal or other high emissions fuels, it's in addition to coal use and other fossil fuel extraction. The proposed pumping of CO2 down to the coal beds looks more like it's intended to maximise gas extraction as part of maximising the use of fossil fuels, not maximise emissions mitigation.

    Has the climate problem ceased to be a consideration in the minds of those making these proposals - or never been a critical consideration? Is the climate problem solely seen as a problem because it represents an obstacle to the business plans of those making such proposals - a problem they address by support for climate science denial PR, tankthink and donations to obstructionist politics?

    I haven't read the paywalled full article but they are right to question the wisdom of setting fire to underground coal seams to force out gas in a warming world.
    Last edited by Ken Fabos; February 24th, 2014 at 05:13 PM.
    adelady likes this.
    Reply With Quote  
     

  6. #5  
    Forum Radioactive Isotope Paleoichneum's Avatar
    Join Date
    Oct 2008
    Location
    Washington State, USA
    Posts
    4,589
    The CO2 deposition solution that they suggest will not work. How are they going to prevent collapses when the coal burns away and the now unsupported roof of the seam weakens and collapses. Any collapse will release all the "sequestered" CO2 immediately.
    If more of us valued food and cheer and song above hoarded gold, it would be a merrier world. -Thorin Oakenshield

    The needs of the many outweigh the need of the few - Spock of Vulcan & Sentinel Prime of Cybertron ---proof that "the needs" are in the eye of the beholder.
    Reply With Quote  
     

Similar Threads

  1. Disaster preparedness - annual vs episodic
    By Pong in forum Earth Sciences
    Replies: 9
    Last Post: December 28th, 2013, 08:20 AM
  2. Goodbye Disaster Forum.
    By Ninja Pancakes in forum Introductions
    Replies: 5
    Last Post: December 15th, 2013, 08:39 PM
  3. Hypothetical Financial Disaster
    By The Finger Prince in forum Business & Economics
    Replies: 0
    Last Post: July 5th, 2011, 07:40 AM
  4. Liquid gas SEPERATION...gas permeable..liquidimpermeable
    By himanshu1khatri in forum Physics
    Replies: 5
    Last Post: August 21st, 2006, 02:53 AM
  5. The Tsunami disaster in satellite pictures
    By Pendragon in forum Earth Sciences
    Replies: 4
    Last Post: January 19th, 2005, 11:41 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •