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Title: CO{sub 2} capture capacity of CaO in long series of carbonation/calcination cycles

Abstract

Calcium oxide can be an effective sorbent to separate CO{sub 2} at high temperatures. When coupled with a calcination step to produce pure CO{sub 2}, the carbonation reaction is the basis for several high-temperature CO{sub 2} capture systems. The evolution with cycling of the capture capacity of CaO derived from natural limestones is experimentally investigated in this work. Long series of carbonation/calcination cycles (up to 500) varying different variables affecting sorbent capacity have been tested in a thermogravimetric apparatus. Calcination temperatures above T > 950{sup o}C and very long calcination times accelerate the decay in sorption capacity, while other variables have a comparatively modest effect on the overall sorbent performance. A residual conversion of about 7-8% that remains constant after many hundreds of cycles and that seems insensitive to process conditions has been found. This residual conversion makes very attractive the carbonation/calcination cycle, by reducing (or even eliminating) sorbent purge rates in the system. A semiempirical equation has been proposed to describe sorbent conversion with the number of cycles based on these new long data series.

Authors:
;  [1]
  1. CSIC, Zaragoza (Spain)
Publication Date:
OSTI Identifier:
20847714
Resource Type:
Journal Article
Resource Relation:
Journal Name: Industrial and Engineering Chemistry Research; Journal Volume: 45; Journal Issue: 26
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CARBON DIOXIDE; CAPTURE; CALCIUM OXIDES; CALCINATION; LIMESTONE; BENCH-SCALE EXPERIMENTS; ADSORBENTS; EQUATIONS

Citation Formats

Grasa, G.S., and Abanades, J.C. CO{sub 2} capture capacity of CaO in long series of carbonation/calcination cycles. United States: N. p., 2006. Web. doi:10.1021/ie0606946.
Grasa, G.S., & Abanades, J.C. CO{sub 2} capture capacity of CaO in long series of carbonation/calcination cycles. United States. doi:10.1021/ie0606946.
Grasa, G.S., and Abanades, J.C. Wed . "CO{sub 2} capture capacity of CaO in long series of carbonation/calcination cycles". United States. doi:10.1021/ie0606946.
@article{osti_20847714,
title = {CO{sub 2} capture capacity of CaO in long series of carbonation/calcination cycles},
author = {Grasa, G.S. and Abanades, J.C.},
abstractNote = {Calcium oxide can be an effective sorbent to separate CO{sub 2} at high temperatures. When coupled with a calcination step to produce pure CO{sub 2}, the carbonation reaction is the basis for several high-temperature CO{sub 2} capture systems. The evolution with cycling of the capture capacity of CaO derived from natural limestones is experimentally investigated in this work. Long series of carbonation/calcination cycles (up to 500) varying different variables affecting sorbent capacity have been tested in a thermogravimetric apparatus. Calcination temperatures above T > 950{sup o}C and very long calcination times accelerate the decay in sorption capacity, while other variables have a comparatively modest effect on the overall sorbent performance. A residual conversion of about 7-8% that remains constant after many hundreds of cycles and that seems insensitive to process conditions has been found. This residual conversion makes very attractive the carbonation/calcination cycle, by reducing (or even eliminating) sorbent purge rates in the system. A semiempirical equation has been proposed to describe sorbent conversion with the number of cycles based on these new long data series.},
doi = {10.1021/ie0606946},
journal = {Industrial and Engineering Chemistry Research},
number = 26,
volume = 45,
place = {United States},
year = {Wed Dec 20 00:00:00 EST 2006},
month = {Wed Dec 20 00:00:00 EST 2006}
}