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Impact of stream impurities on compressor power requirements for CO2 pipeline transportation

Martynov, SB; Daud, NB; Mahgerefteh, H; Brown, S; Porter, R; (2016) Impact of stream impurities on compressor power requirements for CO2 pipeline transportation. International Journal of Greenhouse Gas Control , 54 (Part 2) pp. 652-661. 10.1016/j.ijggc.2016.08.010. Green open access

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Abstract

The economic viability of Carbon Capture and Sequestration (CCS) as a means of mitigating CO2 emissions is significantly dependent on the minimisation of costs associated with the compression and transportation of the captured CO2. This paper describes the development and application of a detailed thermodynamic model to compute and compare power requirements for various multistage compression strategies for CO2 streams containing typical impurities originating from various capture technologies associated with industrial and power emission sectors. The compression options examined include conventional multistage integrally geared centrifugal compressors, supersonic shockwave compressors and multistage compression combined with subcritical liquefaction and pumping. In order to estimate the power demand for inter-stage cooling and liquefaction a thermodynamic model based on Carnot refrigeration cycle is applied. The study shows that for all the compression options examined, the compression power reduces with the increase in the purity of the CO2 stream, while the inter-stage cooling duty is predicted to be significantly higher than the compression power demand. For CO2 streams carrying less than 5% impurities, multistage compression combined with liquefaction and subsequent pumping from ca 62 bar pressure can offer higher efficiency than conventional gas-phase compression. In the case of a raw/dehumidified oxy-fuel CO2 stream of ca 85% purity, subcritical liquefaction at 62 bar pressure is shown to increase the cooling duty by ca 50% as compared to pure CO2.

Type: Article
Title: Impact of stream impurities on compressor power requirements for CO2 pipeline transportation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ijggc.2016.08.010
Publisher version: http://doi.org/10.1016/j.ijggc.2016.08.010
Language: English
Additional information: © 2016 Published by Elsevier Ltd. This manuscript version is made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at http://creativecommons.org/ licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: CCS,CO2 impurities, Oxy-fuel, Pre-combustion, Compression powerCooling duty
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1522551
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