Numerical study of the effect of heat transfer on solid phase formation during decompression of CO2 in pipelines

Abstract

CO<jats:sub>2</jats:sub> solid phase formation accompanying rapid decompression of high-pressure CO<jats:sub>2</jats:sub> pipelines may lead to blockage of the flow and safety valves, presenting significant hazard for safe operation of the high-pressure CO<jats:sub>2</jats:sub> storage and transportation facilities. In this study, a homogeneous equilibrium flow model, accounting for conjugate heat transfer between the flow and the pipe wall, is applied to study the CO<jats:sub>2</jats:sub> solid formation in a 50 mm internal diameter and 37 m long pipe for various initial thermodynamic states of CO<jats:sub>2</jats:sub> fluid and wide range of discharge orifice diameters. The results show that the rate of CO<jats:sub>2</jats:sub> solid formation in the pipe is limited by heat transfer at the pipe wall. The predicted amounts of solid CO<jats:sub>2</jats:sub> are discussed in the context of venting of CO<jats:sub>2</jats:sub> pipelines.

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The different versions of the original document can be found in:

• https://www.matec-conferences.org/articles/matecconf/pdf/2018/99/matecconf_icchmt2018_01026.pdf under the license https://creativecommons.org/licenses/by

• https://discovery.ucl.ac.uk/10064608,

https://academic.microsoft.com/#/detail/2903400240 under the license cc-by

• https://discovery.ucl.ac.uk/id/eprint/10064608,

https://discovery.ucl.ac.uk/id/eprint/10064608/1/matecconf_icchmt2018_01026.pdf

• https://doi.org/10.1051/matecconf/201824001026,

https://doaj.org/toc/2261-236X

• https://www.matec-conferences.org/10.1051/matecconf/201824001026/pdf,

http://dx.doi.org/10.1051/matecconf/201824001026

under the license http://creativecommons.org/licenses/by/4.0