61 comments on Q & A With Paul Hanrahan, CEO of AES
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61 comments on Q & A With Paul Hanrahan, CEO of AES
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GAIA Host Collective
I assume you are referring to amine-based CO2 scrubbing?
It's a very inefficient process in a conventional PC plant-- because the CO2 stream is so dilute.
Costs are high.
Table 3.7
http://arch.rivm.nl/env/int/ipcc/pages_media/SRCCS-final/SRCCS_Chapter3.pdf
In practice, retrofitting is messy and impossible on some plants.
The CO2 concentration in exhaust gas is less than in the output of a water-shift reactor, true, but only by a few percent. It's more investment, of course, but a hell of a lot less than starting from scratch with a IGCC. Costs you no energy because you use the waste heat of the power plant.
My understanding is that retrofitting CO2 extraction is a very costly exercise, to the point where it probably won't happen.
New plants, again my understanding is an IGCC with CO2 extraction is a lower cost proposition than a supercritical steam coal plant with CO2 extraction.
Do you have any good data on costs? Any cites?