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How much can novel solid sorbents reduce the cost of post-combustion CO2 capture? A techno-economic investigation on the cost limits of pressure–vacuum swing adsorption

How much can novel solid sorbents reduce the cost of post-combustion CO2 capture? A techno-economic investigation on the cost limits of pressure–vacuum swing adsorption

Category
Academic article
Abstract
This paper focuses on identifying the cost limits of two single-stage pressure–vacuum swing adsorption (PVSA)
cycles for post-combustion CO2
capture if the ‘‘ideal’’ zero-cost adsorbent can be discovered. Through an
integrated techno-economic optimisation, we simultaneously optimise the adsorbent properties (adsorption
isotherms and particle morphology) and process design variables to determine the lowest possible cost of
CO2 avoided (excluding the CO2
conditioning, transport and storage) for different industrial flue gas CO2
compositions and flow rates. The CO2 avoided cost for PVSA ranges from 87.1 to 10.4 e per tonne of CO2
avoided, corresponding to CO2
feed compositions of 3.5 mol% to 30 mol %, respectively. The corresponding
costs for a monoethanolamine based absorption process, using heat from a natural gas plant, are 76.8 to
54.8 e per tonne of CO2 avoided, respectively showing that PVSA can be attractive for flue gas streams with
high CO2
compositions. The ‘‘ideal’’ adsorbents needed to attain the lowest possible CO2 avoided costs have a
range of CO2 affinities with close to zero N2 adsorption, demonstrating promise for adsorbent discovery and
development. The need for simultaneously optimising the particle morphology and the process conditions are
emphasised.
Client
  • Research Council of Norway (RCN) / 257579
Language
English
Author(s)
Affiliation
  • University of Alberta
  • SINTEF Energy Research / Gassteknologi
Year
Published in
Applied Energy
ISSN
0306-2619
Publisher
Elsevier
Volume
306
Issue
Part A