TY - JOUR
T1 - Capturing CO2 from air: Technical performance and process control improvement
AU - Bajamundi, Cyril Jose E.
AU - Koponen, Joonas
AU - Ruuskanen, Vesa
AU - Elfving, Jere
AU - Kosonen, Antti
AU - Kauppinen, Juho
AU - Ahola, Jero
N1 - Funding Information:
TEKES now Business Finland is acknowledged for the main financial support of the SOLETAIR project ( https://soletair.fi ). The project partners are also thanked for their financial and in-kind contributions. The SOLETAIR project concept was developed from the work carried out in the Neo-Carbon Energy project ( https://neocarbonenergy.fi ). Acknowledgements to Dr. Pasi Vainikka for spearheading the Neo-Carbon project.
Publisher Copyright:
© 2019 Elsevier Ltd. All rights reserved.
PY - 2019/2/25
Y1 - 2019/2/25
N2 - Direct air capture (DAC) is a technology for collecting and concentrating carbon dioxide from ambient air. If driven with renewable power, DAC is potentially a negative CO2 emissions technology that can compensate emissions from non-point sources such as aviation, shipping and land-use change. This study presents the results of 10 days capture campaign done between May and July 2018 plus a process control improvement test. The bench scale DAC device is composed of eight beds containing amine-functionalized adsorbent and follows a temperature and vacuum swing adsorption (TVSA) operation cycle. The outlet CO2 concentration reached less than 100ppm at the start of the adsorption. Dynamic atmospheric conditions (varying T, relative humidity) affect the capture profile of the beds. Desorption is accomplished by heating the bed up to around 80°C coupled with vacuum. The product gas has purity range of 95-vol% to 100-vol% CO2 . Major impurities are O2 , N2 , and H2O. The DAC system also produced water at molar ratio of 3.9 moles H2O per mole of CO2 . Water production is affected by air humidity. Measurement-based process control increased the production to 3.4kg CO2 per cycle with specific energy requirement of 10kWhkg-1 . The thermal energy requirement accounted for 76% of the total energy input during the improvement test.
AB - Direct air capture (DAC) is a technology for collecting and concentrating carbon dioxide from ambient air. If driven with renewable power, DAC is potentially a negative CO2 emissions technology that can compensate emissions from non-point sources such as aviation, shipping and land-use change. This study presents the results of 10 days capture campaign done between May and July 2018 plus a process control improvement test. The bench scale DAC device is composed of eight beds containing amine-functionalized adsorbent and follows a temperature and vacuum swing adsorption (TVSA) operation cycle. The outlet CO2 concentration reached less than 100ppm at the start of the adsorption. Dynamic atmospheric conditions (varying T, relative humidity) affect the capture profile of the beds. Desorption is accomplished by heating the bed up to around 80°C coupled with vacuum. The product gas has purity range of 95-vol% to 100-vol% CO2 . Major impurities are O2 , N2 , and H2O. The DAC system also produced water at molar ratio of 3.9 moles H2O per mole of CO2 . Water production is affected by air humidity. Measurement-based process control increased the production to 3.4kg CO2 per cycle with specific energy requirement of 10kWhkg-1 . The thermal energy requirement accounted for 76% of the total energy input during the improvement test.
KW - Carbon dioxide
KW - Direct air capture
KW - Negative emissions
KW - Temperature vacuum swing adsorption
UR - http://www.scopus.com/inward/record.url?scp=85062686119&partnerID=8YFLogxK
U2 - 10.1016/j.jcou.2019.02.002
DO - 10.1016/j.jcou.2019.02.002
M3 - Article
AN - SCOPUS:85062686119
SN - 2212-9820
VL - 30
SP - 232
EP - 239
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
ER -
