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Performance of polyethyleneimine–silica adsorbent for post-combustion CO2 capture in a bubbling fluidized bed

Zhang, Wenbin; Liu, Hao; Sun, Chenggong; Drage, Trevor C.; Snape, Colin E.

Authors

Wenbin Zhang

HAO LIU liu.hao@nottingham.ac.uk
Professor of Energy Engineering

Trevor C. Drage

COLIN SNAPE COLIN.SNAPE@NOTTINGHAM.AC.UK
Professor of Chemical Technology & Chemical Eng



Abstract

The high performance of polyethyleneimine (PEI)-based solid adsorbent for CO2 capture has been well recognized in thermogravimetric analysis (TGA) and small-scale fixed bed reactors through the measurements of their equilibrium capacities but has not been really demonstrated on larger scales towards practical utilization. In the present study, a laboratory-scale bubbling fluidized bed reactor loaded with a few kg adsorbent is used to evaluate the adsorption performance of PEI–silica adsorbent under different working conditions including with/without the presence of moisture, different gas–solid contact times, initial bed temperatures, and CO2 partial pressures. The adsorption capacities have shown a clear degradation tendency under dry condition. However, they can be stabilized at a high level of 10.6–11.1% w/w over 60 cycles if moisture (ca. 8.8 vol%) is present in the gas flow during adsorption and desorption. Breakthrough capacities can be stabilized at the level of 7.6–8.2% w/w with the gas–solid contact time of 13 s. The adsorption capacities for the simulated flue gases containing 5% CO2 are only slightly lower than those for the simulated flue gases containing 15% CO2, indicating that the PEI–silica adsorbent is suitable for CO2 capture from flue gases of both coal-fired and natural gas-fired combined cycle power plants. The exothermal heat of adsorption is estimated by the energy balance in the fluidized bed reactor and found to be close (within 10%) to the measured value by TG-DSC. The regeneration heat for the as prepared PEI–silica adsorbent is found to be 2360 kJ/kgCO2 assuming 75% recovery of sensible heat which is well below the values of 3900–4500 kJ/kgCO2 for a typical MEA scrubbing process with 90% recovery of sensible heat.

Citation

Zhang, W., Liu, H., Sun, C., Drage, T. C., & Snape, C. E. (2014). Performance of polyethyleneimine–silica adsorbent for post-combustion CO2 capture in a bubbling fluidized bed. Chemical Engineering Journal, 251, 293-303. https://doi.org/10.1016/j.cej.2014.04.063

Journal Article Type Article
Acceptance Date Apr 16, 2014
Online Publication Date Apr 24, 2014
Publication Date Sep 1, 2014
Deposit Date Sep 1, 2017
Publicly Available Date Sep 1, 2017
Journal Chemical Engineering Journal
Print ISSN 1385-8947
Electronic ISSN 1385-8947
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 251
Pages 293-303
DOI https://doi.org/10.1016/j.cej.2014.04.063
Keywords Carbon capture, PEI, Solid adsorbent, Bubbling fluidized bed
Public URL http://eprints.nottingham.ac.uk/id/eprint/45357
Publisher URL http://www.sciencedirect.com/science/article/pii/S1385894714004951
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
Additional Information This article is maintained by: Elsevier; Article Title: Performance of polyethyleneimine–silica adsorbent for post-combustion CO2 capture in a bubbling fluidized bed; Journal Title: Chemical Engineering Journal; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.cej.2014.04.063; Content Type: article; Copyright: Copyright © 2014 The Authors. Published by Elsevier B.V.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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