CO2 capture and transport-conditioning through liquefaction

As describes in CO2 value chain and legal aspects (Task 1) , CO2 transport is an important piece of the value CCS value chain. We are looking to use liquefaction to optimise the transport condition of CO2. To do this, we need to derive an efficient CO2 liquefier process designs.

As described in Task 1, shipping of CO2 is most likely to be the preferred mean of transport. Hence, liquefaction will be a mandatory processing stage in the interface between capture and transport, thus playing an imperative role in the CSS value chain. Important design criteria are therefore energy- and cost efficiency adhering to transport specifications, and safety.

As a proof of concept, a pilot rig for CO2 liquefaction with 10–15 t CO2/day capacity is under commissioning, financed under the ECCSEL programme.

Through its research, the this task will provide other tasks with important insight like:

Several of our activities, such as process modelling and simulation, is of relevance to potential suppliers of post-, oxy- and pre-combustion capture units, as well as critical components thereof. Further, it is also of general relevance to shipping companies that are potential shippers of liquid CO2 between the points of capture and unloading.

Results 2017

The main activity was to provide an overview of the relevant inlet and outlet boundary conditions and specifications (compositions, temperature, pressure etc.) to which CO2 liquefaction processes must adhere. The gathering of information was done by data collection from other deliverables where available, as well as by communication with other NCCS tasks.

Examples of inlet boundary specifications are: CO2 captured from post-combustion capture with relatively high purity, and CO2-enriched synthesis gas retentate from protonic membrane reforming (PMR). Outlet specifications are mainly high-pressure CO2 for pipeline transport and liquid CO2 for ship transport. Low-temperature CO2 processing and its adherence to the various boundary conditions in post- and pre-combustion applications was given an initial consideration.

In parallel with the NCCS work, the task core group is involved in the construction and commissioning of a laboratory pilot infrastructure for low-temperature CO2 separation and liquefaction, funded through the ECCSEL infrastructure programme. The infrastructure has a capacity in the range 5–15 ton CO2 per day, and can operate down to around -55°C temperature range and up to 120 bar pressure. Upon completion, the infrastructure will be available for experimental activities relevant for NCCS.

Task leader

David Berstad

Research Scientist
David Berstad
Research Scientist
930 02 784
Gas Technology