Stories tagged carbon capture

The idea of a synthetic tree to capture excess carbon dioxide from the air was announced in 2003. After years of work, physicist Klaus Lackner will present a public demonstration of the technology today (October 26, 2011) at the London headquarters of the Institution of Mechanical Engineers. Artistic Representation of a Synthetic "Tree Farm"
Artistic Representation of a Synthetic "Tree Farm"Courtesy Institution of Mechanical Engineers

The prototype tree, which looks like a goal post with Venetian blinds, draws carbon dioxide (CO2) out of the air like a plant, but unlike a plant, retains the carbon and does not release oxygen.

Klaus Lackner estimates that some 250,000 such trees, which potentially could be planted anywhere*, even in desert regions, would be needed to soak up the CO2 produced by human activity annually.

Live Webinar at 12:00pm Central Daylight Time, October 26, 2011 (duration 3 hours): Artificial Trees: Giving us the time to act?
Columbia University blogpsot: Artificial Trees: Giving Us Time to Act?



* Well, not anywhere, as I later found out from the Environment 360 blog; the tecnology won't work in cold boreal regions or the humid tropics. And regarding the use of organic trees for carbon capture, see Chapter 31 of David McKay's Sustainable Energy - Without the Hot Air.

Nov
08
2009

Cleaner coal: The Mountaineer Power Plant is the first in the world to capture some of the carbon dioxide it emits from burning 3.5 million tons of coal yearly and sequester it two and a half kilometers underground.
Cleaner coal: The Mountaineer Power Plant is the first in the world to capture some of the carbon dioxide it emits from burning 3.5 million tons of coal yearly and sequester it two and a half kilometers underground.Courtesy rmcgervey

Carbon dioxide removed from power plant exhaust and pumped underground

In addition to other environmental technology add-ons that strip out the fly ash, sulfur dioxide and nitrogen oxides, the Mountaineer Power Plant in West Virginia now also uses a carbon-capture unit built by Alstom. Dubbed the "chilled ammonia" process, baker's ammonia is used to strip carbon dioxide from the cooled flue gas and then, by reheating the resulting ammonium bicarbonate, captures that carbon dioxide, compresses it into a liquid, and

pumps it 2,375 meters straight down into the Rose Run sandstone, a 35-meter-thick layer with a nine-meter-thick band of porous rock suitable for storage. (or...) into Copper Ridge dolomite, which has much thinner strata for possible storage, more than 2,450 meters down. Thick bands of shale and limestone that lie on top ensure that the carbon dioxide does not escape back to the surface. Scientific American

Only 1.5% but first in the world

Only about 1.5 percent of the carbon dioxide billowing from its stack is being captured now. Scaling up the process to capture 20% of the CO2 will cost at least $700 million. The removal of carbon dioxide will add abouts 4 cents more to the current cost of Mountaineer electricity (roughly 5 cents per kWh). This chilled-ammonia technology should be available commercially by 2015.

Learn more:
Slide show of Mountaineer Power carbon sequestering technology.
First Look at Carbon Capture and Storage in a West Virginia Coal-Fired Power Plant Scientific American