Energy efficiency analysis of CO 2 mineral sequestration in magnesium silicate rock using electrochemical steps

Thomas Björklöf; Ron Zevenhoven

doi:10.1016/j.cherd.2012.02.001

Energy efficiency analysis of CO ₂ mineral sequestration in magnesium silicate rock using electrochemical steps

Thomas Björklöf
, Ron Zevenhoven^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

14 Citations (Scopus)

Abstract

A thermodynamic efficiency analysis using the exergy concept is used to assess CO ₂ mineral sequestration process routes where electrochemical steps (electrolysis and fuel cells) are used to produce aqueous hydrochloric acid and sodium hydroxide reactant solutions. Results from three recent publications on the subject that come to different conclusions are used for this case study. It is shown that including electrolysis as one of the steps of a magnesium silicate mineral carbonation process route results in input energy requirements that will exceed the output of a fossil fuel-fired power plant that produces the CO ₂ that is bound to (hydro-) carbonates. At the same time, fuel cells are not efficient enough to change this.

Original language	English
Pages (from-to)	1467-1472
Number of pages	6
Journal	Chemical Engineering Research and Design
Volume	90
Issue number	10
DOIs	https://doi.org/10.1016/j.cherd.2012.02.001
Publication status	Published - Oct 2012
MoE publication type	A1 Journal article-refereed

Funding

This work is funded by the Academy of Finland's Sustainable Energy program (2008–2011), project Carbonates in Energy Technology (CarETech).

Keywords

CO sequestration
Electrolysis
Energy efficiency
Exergy
Magnesium silicates
Mineral carbonation

Access to Document

10.1016/j.cherd.2012.02.001Licence: Unknown

Cite this

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title = "Energy efficiency analysis of CO 2 mineral sequestration in magnesium silicate rock using electrochemical steps",

abstract = "A thermodynamic efficiency analysis using the exergy concept is used to assess CO 2 mineral sequestration process routes where electrochemical steps (electrolysis and fuel cells) are used to produce aqueous hydrochloric acid and sodium hydroxide reactant solutions. Results from three recent publications on the subject that come to different conclusions are used for this case study. It is shown that including electrolysis as one of the steps of a magnesium silicate mineral carbonation process route results in input energy requirements that will exceed the output of a fossil fuel-fired power plant that produces the CO 2 that is bound to (hydro-) carbonates. At the same time, fuel cells are not efficient enough to change this.",

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N2 - A thermodynamic efficiency analysis using the exergy concept is used to assess CO 2 mineral sequestration process routes where electrochemical steps (electrolysis and fuel cells) are used to produce aqueous hydrochloric acid and sodium hydroxide reactant solutions. Results from three recent publications on the subject that come to different conclusions are used for this case study. It is shown that including electrolysis as one of the steps of a magnesium silicate mineral carbonation process route results in input energy requirements that will exceed the output of a fossil fuel-fired power plant that produces the CO 2 that is bound to (hydro-) carbonates. At the same time, fuel cells are not efficient enough to change this.

AB - A thermodynamic efficiency analysis using the exergy concept is used to assess CO 2 mineral sequestration process routes where electrochemical steps (electrolysis and fuel cells) are used to produce aqueous hydrochloric acid and sodium hydroxide reactant solutions. Results from three recent publications on the subject that come to different conclusions are used for this case study. It is shown that including electrolysis as one of the steps of a magnesium silicate mineral carbonation process route results in input energy requirements that will exceed the output of a fossil fuel-fired power plant that produces the CO 2 that is bound to (hydro-) carbonates. At the same time, fuel cells are not efficient enough to change this.

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KW - Electrolysis

KW - Energy efficiency

KW - Exergy

KW - Magnesium silicates

KW - Mineral carbonation

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