Abstract
To maximise economies of scale of future CO2 transport infrastructure, new CO2
pipelines within the carbon capture utilisation and storage (CCUS)
value chain, should ideally have excess capacity to satisfy future
transportation demand. However, in scenarios where booster compressors
cannot be employed along the pipeline, the rise in pipeline mass flow
rate over time culminates in higher energy consumption of upstream
compression/liquefaction. This work explores the optimisation of various
CO2 pressurisation pathways and assesses their flexibility
in handling a variability in pipeline mass flow rates whilst delivering a
captured CO2 stream at a fixed final pressure of 100 barg.
The study is based on the Dunkirk 3D Project, which has a planned
nameplate capture capacity of 1 MtCO2/y, with other CO2 point sources taking up additional pipeline utilisation capacity. Two categories of CO2
pressurisation pathways are considered, gas compression and subcritical
liquefaction and pumping. These pathways are optimised to enable a fair
comparison, considering the number of compression stages, compression
ratio, and cooling/liquefaction system. Modelling results indicate that
the temperature of the cooling utility has the greatest influence in
reducing the overall work duty and sensitivity to a variability in
pipeline mass flow rate. Furthermore, the utilisation of 5 °C seawater
as a cooling and liquefaction utility reduces the work duty of the
conditioning process by 25.4% and requires fewer compression stages
relative to conventional gas compression utilising cooling water at
30 °C
Original language | English |
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Article number | 103943 |
Journal | International Journal of Greenhouse Gas Control |
Volume | 128 |
Number of pages | 10 |
ISSN | 1750-5836 |
DOIs | |
Publication status | Published - 2023 |
Keywords
- CCS Hub Dunkirk
- CO2 capture
- CO2 conditioning
- CO2 pipelines
- DMXTM process