Talk:Chemical looping combustion
|WikiProject Chemical and Bio Engineering|
Ohio State University Office of Energy and Environment announced January 19, 2013 Successful 200+ Hour Continuous Operation of Coal-Direct Chemical Looping Combustion Technology. It's a 25 kWth sub-pilot plant, but according to the press release, there is funded follow-on study work, in parnership with Babcock and Wilcox Power Generation Group, toward a commercial 550 MWe power plant based on the process.
I think this is a significant development, but haven't tried to edit it into the article. I didn't see an easy place to add it without breaking the flow of what's there. So I'll leave that job to bolder editor. Agnostic Engineer (talk) 08:02, 25 March 2013 (UTC)
Issue of Thermal Efficiency
I don't understand how chemical looping was supposed to enhance efficiency of power plants. I understand reversibility and the efficiency of quasi-isentropic processes, but I don't see how the oxidation and reduction reactions of chemical looping could possibly be quasi-isentropic. The thermal energy liberated in combustion by chemical looping is the same as the energy liberated in straight combustion; the fact that it's liberated at a lower temperature is irrelevant.
To get more work output from the same amount of fuel in any heat engine, the only possibilities are to operate at a higher source-to-sink temperature delta, or to somehow use the potential energy in the fuel to pump heat. But the latter would require a below-ambient process step where thermal energy was obtained from the ambient environment. There is no such step in the process shown.
The paragraph explaining the initial intent for achieving higher efficiency is referenced, and I don't question that there was indeed a paper suggesting that chemical looping could do that. However the referenced paper is not online, and I don't have access to a library that would have hardcopy. It's possible that I'm misunderstanding something, but it would be nice if somebody with access to the paper could review it and clarify the paragraph that cites it. Agnostic Engineer (talk) 21:43, 3 January 2014 (UTC)
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