An experimental investigation on pressure response and
phase transition of supercritical carbon dioxide releases
from a small‐scale pipeline
| Hailong Zhu
| Jianliang Yu
| Shaoyun Chen
| Haroun Mahgerefteh
School of Chemical Machinery and
Safety, Dalian University of Technology,
Dalian 116024, China
School of Chemical Engineering, Dalian
University of Technology, Dalian 116024,
Department of Chemical Engineering,
University College London, London
WC1E 7JE, UK
Jianliang Yu, School of Chemical
Machinery and Safety, Dalian University
of Technology, Dalian 116024, China.
European Union Seventh Framework
Programmes FP7‐ ENERGY‐2009‐1 and
Award Numbers: 241346 and 309102
The prediction of the pressure response and phase transition in the event of an
accidental carbon dioxide (CO
) release from a ruptured pipeline is of signifi-
cant importance for understanding the depressurization behaviour and hence
the fracture behaviour. This article presented a small‐scale experimental inves-
tigation on the pressure response and phase transition of supercritical CO
release from a pressurized pipeline with a relief orifice. High‐frequency trans-
ducers and thermocouples were used to measure the evolution of CO
sures and temperatures at different locations after release. The results
indicated that pressures at different locations decreased nearly synchronously
after release. No vapour bubble and pressure rebound generated in larger scale
release experiments were found in our small‐scale release experiments. The
depressurization rate was greatly affected by the phase transition. During the
release process, the supercritical CO
firstly turned into an unstable gas with
a very great depressurization rate, then changed into the gas–liquid phase with
a lower depressurization rate, and finally changed into gaseous CO
. The larger
the relief diameter was, the longer the gas–liquid phase state lasted.
phase transition, pressure response, small‐scale pipeline, supercritical CO
1 | INTRODUCTION
One of the most difficult global environmental problems
which human beings are now facing is the increasing
atmospheric greenhouse gases and the resulting global
emitted from fossil fuel combustion is a
major contributor to the greenhouse effect. This situation
will not be changed in the coming decades due to the
actual energy situation of the global energy structure.
Carbon capture and storage (CCS) technology intends to
capture the released CO
at the emission sources and
transport the captured CO
to storage locations to miti-
gate the amount of CO
released into the atmosphere.
The scale and safety requirements of CCS application
determine that pipeline transportation is the primary
means of CO
transportation, due to its high efficiency
and good economy.
It is reported that a great deal of
pipelines will need to be constructed in more densely pop-
ulated areas, where multiple anthropogenic sources exist.
Pipelines usually suffer from failure risks, either puncture
or full‐bore rupture, caused by mechanical damage,
corrosion, material defects, or operational error.
is released suddenly from the pipeline,
causing property loss and casualties owing to asphyxia.
released from pressurized pipelines is more com-
plicated to deal with than other substances, because the
Received: 3 January 2018 Revised: 20 March 2018 Accepted: 26 March 2018
Asia‐Pac J Chem Eng. 2018;13:e2197.
© 2018 Curtin University and John Wiley & Sons, Ltd.wileyonlinelibrary.com/journal/apj 1of8