Anthony Veder has developed CO2 case studies in close corporation with various clients. Here, a full transportation scope is defined, from the liquefaction process to temporary storage possibilities and the offshore discharge. The CO2 Shippping concept offers clients an intergrated solution to their CO2 transportation needs.
By obtaining knowledge of the full transportation and logistics chain, Anthony Veder can identify the particular sensitivities of the process which enables us to come with the most efficient and economically-attractive solution. By doing this we can obtain a good understanding of the shore-vessel interface and identify quick-wins.
A liquefaction plant takes the CO2 from the carbon capture plant, compresses it, dehydrates and liquefies it for storage. The following stages can be identified:
Liquefaction train: the CO2 will be liquefied using a sub-critical liquefaction process, utilising an external refrigerant operating on an economised condensing vapour compression cycle, with multiple evaporating temperatures.
This liquefaction process has been selected to achieve the lowest specific power requirements, compared to competing processes and the process route itself comprises a relatively simple, proven technology.
Refrigeration Cycle: the refrigeration cycle is a conventional, economised vapour compression cycle condensing against cooling water. Two levels of refrigeration are utilised.The carbon capture plant is designed to turn down with the daily demand cycle of the power plant. The two-train approach is important in achieving this.
Storage: the CO2 is stored in cryogenic storage bullets. Total storage capacity depends on the logistical solution the shipping concept has to offer.
Loading: in most cases a single liquid loading arm is used due to the relatively-low loading rate which is necessary for a smaller ship. The ship's vapour is returned to the Liquefaction plant via the piggyback arrangement on the Vapour Return Arm.
Offloading: CO2 is usually discharged into a pipeline system or offshore, into a depleted gas field. An offloading tower can be used or a vessel can be connected to a floating buoy system. Anthony Veder can carry out both methods but it will depend on the environmental conditions at the site which solution is preferable.
