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The energy penalty of post-combustion CO2 capture & storage and its implications for retrofitting the U.S. installed base
 

Summary: The energy penalty of post-combustion CO2 capture & storage and its
implications for retrofitting the U.S. installed base
Kurt Zenz House,a
Charles F. Harvey,b
Michael J. Azizc
and Daniel P. Schraga
Received 8th July 2008, Accepted 16th December 2008
First published as an Advance Article on the web 22nd January 2009
DOI: 10.1039/b811608c
A review of the literature has found a factor of 4 spread in the estimated values of the energy penalty
for post-combustion capture and storage of CO2 from pulverized-coal (PC) fired power plants. We
elucidate the cause of that spread by deriving an analytic relationship for the energy penalty from
thermodynamic principles and by identifying which variables are most difficult to constrain. We
define the energy penalty for CCS to be the fraction of fuel that must be dedicated to CCS for a fixed
quantity of work output. That penalty can manifest itself as either the additional fuel required to
maintain a power plant's output or the loss of output for a constant fuel input. Of the 17 parameters
that constitute the energy penalty, only the fraction of available waste heat that is recovered for use
and the 2nd-law separation efficiency are poorly constrained. We provide an absolute lower bound
for the energy penalty of $11%, and we demonstrate to what degree increasing the fraction of
available-waste-heat recovery can reduce the energy penalty from the higher values reported. It is

  

Source: Aziz, Michael J.- School of Engineering and Applied Sciences, Harvard University

 

Collections: Physics; Materials Science