deepC Store submits its CO2 supply specification to the Australian Government to assist its review of the national “Action List” as per the London Protocol
deepC Store (“dCS”) has submitted the CO₂ supply specification for CStore1, dCS’s floating CCS hub project, to the Australian Commonwealth Government to assist its review of the national “Action List” for the assessment of CO₂ streams for sequestration as per the London Protocol*.
dCS has co-developed its CO₂ supply specification for CStore1 with Pace CCS, dCS’s technical advisor (link). Upon finalising this CO₂ supply specification, dCS and Pace CCS also sought input from dCS’s industry partners and prospective CO₂ suppliers.
For full detail of the CO₂ supply specification for CStore1, see link.
Key takeaways from the CO₂ supply specification for CStore1 are:
dCS sets its CO₂ supply specification for 2 potential delivery points for CO₂ supply (one being pre-liquefaction of CO₂, and the other being post-liquefaction of CO₂).
The CO₂ supply specification at pre-liquefaction consists of ≥ 95.0 mol% CO₂, and a combined total ≤ 4 mol% of light ends (N₂, H₂, CH4, Ar, CO, C₂H₆).
Regarding the CO₂ supply specification at post-liquefaction:
For the LP (approximately 7 bar, -49°C) and MP (approximately 19 bar, -25°C) shipping conditions, the liquefaction process will remove the majority of the light ends (N₂, H₂, CH4, Ar, CO, C₂H₆) and therefore the CO₂ supply specification will be higher purity at shipping conditions.
For the HP shipping condition (approximately 75 bar, 10°C), the light ends remain soluble in the liquefied CO₂ and therefore the CO₂ supply specification will remain the same as that for the battery limit at pre-liquefaction.
Upon developing the CO₂ specification, dCS and Pace CCS considered a wide range of potential CO₂ supply sources. These include iron & steel furnaces, traditional fossil fuel power plants, biomass power plants and waste incinerators, refinery stack, cement plants & kilns, lime production, ammonia production, and carbon capture Direct from Air (DAC).
Each industry has a different set of non-CO₂ components associated with its CO₂, with this range of non-CO₂ components considered in the development of the CStore1 CO₂ specification. dCS notes that:
dCS will apply its CO₂ supply specification to all CO₂ suppliers. dCS does not plan on setting specific / different CO₂ supply specification for each CO₂ supplier.
For CO₂ supply that deviates from the CO₂ supply specification for CStore1, dCS highlights the need for an assessment to be performed for evaluating any potential risks to CStore1.
Daein Cha, Director of dCS, says: “We are pleased to publish our work with Pace CCS. The CO₂ supply specification is one of the most important technical conditions to determine with our prospective CO₂ suppliers. This ensures that no risk to downstream material integrity or other HSE risks are introduced to our CCS projects, and that we maximise flexibility such that cost of CO₂ capture by the CO₂ Suppliers is minimised. We trust that this information will assist other CCS project proponents to determine a pragmatic and robust CO₂ supply specification for their projects.”
Matt Healey, Managing Director of Pace CCS, says: “CStore1 is a world-leading project and we are delighted to share this specification publicly. All CCS projects must ensure integrity, while maximising uptime and allowing maximum flexibility for operations. We hope that this information is useful to regulators, and to other projects to find this balance.”
Michael Malavazos, Director of Engineering Operations at the Department for Energy and Mining in South Australia and Chair of the Australian CCS mirror committee to the ISO technical standards committee, provides praise for this work being published and says: “This is an excellent and promising initiative to setting an international benchmark for CO₂ stream composition for the purpose of ensuring safe and reliable transportation and injection.”
* The London Protocol obligates each Contracting Party to develop a national Action List to provide a mechanism for screening candidate wastes and their constituents on the basis of their potential effects on human health and the marine environment (noting the need of “the CO2 stream is of high purity, containing only incidental amounts of associated substances”).
For further details please contact
deepC Store Limited - Daein Cha getintouch@deepcstore.com
