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Under-expanded jets and dispersion in supercritical CO2 releases from a large-scale pipeline

Guo, X; Yan, X; Yu, J; Zhang, Y; Chen, S; Mahgerefteh, H; Martynov, S; ... Proust, C; + view all (2016) Under-expanded jets and dispersion in supercritical CO2 releases from a large-scale pipeline. Applied Energy , 183 pp. 1279-1291. 10.1016/j.apenergy.2016.09.088. Green open access

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Abstract

Long-distance CO2 pipelines will be widely applied to transport captured CO2 from fossil fuel fired power plants for subsequent sequestration. In the event of pipeline failure a large mass of the inventory may be discharged within a short time, this represents a significant hazard if leaks continue undetected. An important result of the risk assessment for a CO2 pipeline is the safety distance. At present the lack of knowledge concerning near-field source terms and the far-field dispersion behavior of CO2 leaking from pipelines can make the calculation of safety distances imprecise. Study of near-field source terms and dispersion behavior is therefore necessary and of paramount importance for assessing safety distances and the impact of CO2 pipeline releases on the surrounding environment. In order to study CO2 pipeline leakage, a large-scale pipeline set-up with a total length of 258 m and an internal diameter of 233 mm was constructed to study the near-field characteristics and dispersion behavior of supercritical CO2 during sudden releases. The dynamic pressure near the orifice and CO2 concentrations and temperatures within the downstream dispersion region were measured together with the pressures inside the pipeline. The under-expanded jet flow structure and phase transitions in the near-field were studied for supercritical CO2 released though different orifice diameters (15 mm, 50 mm and Full Bore Rupture). The formation of the visible cloud, the distribution of cloud temperatures and CO2 concentrations in the far-field were analyzed using the measured data, photographs and video recordings. The safety distances along the horizontal direction for 5% CO2 concentration for each of the three orifice diameters were determined from the lower limit for adverse human effects.

Type: Article
Title: Under-expanded jets and dispersion in supercritical CO2 releases from a large-scale pipeline
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apenergy.2016.09.088
Publisher version: http://dx.doi.org/10.1016/j.apenergy.2016.09.088
Language: English
Additional information: Copyright © 2016. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence 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 licences are available at http://creativecommons.org/licenses/by/4.0.
Keywords: Supercritical CO2 release; Under-expanded jet; Dispersion; Large-scale pipeline
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/1522603
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