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WO-2026092868-A1 - METHOD FOR DISCHARGING AN LCO2 EMITTER STORAGE TANK INTO AN LCO2 STORAGE TANK ON BOARD A SHIP, AND CORRESPONDING SYSTEM AND SHIP

WO2026092868A1WO 2026092868 A1WO2026092868 A1WO 2026092868A1WO-2026092868-A1

Abstract

The invention relates to a method (300) for discharging an LCO 2 emitter storage tank (4) into an LCO 2 storage tank (6) on board a ship (100), wherein the method (300) comprises the steps of: discharging (302) liquid LCO 2 (LB) from the LCO 2 emitter storage tank (4) into the LCO 2 storage tank (6) on board the ship (100), wherein during the discharging (302) a partial flow of liquid LCO 2 (LB*) is diverted; evaporating (304) the diverted partial flow of liquid LCO 2 (LB*), in particular by means of a heat exchanger (14), such that a partial flow of vaporous LCO 2 (VB*) is produced; removing (306) vaporous LCO 2 (VA) from the LCO 2 storage tank (6) on board the ship (100); condensing (308) the removed vaporous LCO 2 (VA) against the diverted partial flow of LCO 2 (LB*) from the LCO 2 emitter storage tank (4), in particular by means of the heat exchanger (14), such that a flow of liquid LCO 2 (LA) is produced, wherein the evaporated diverted partial flow (VB*) is conducted back into the LCO 2 emitter storage tank (4).

Inventors

  • Krauss, Florian
  • BUSCHMANN, Max

Assignees

  • TGE MARINE GAS ENGINEERING GMBH

Dates

Publication Date
20260507
Application Date
20250407
Priority Date
20241104

Claims (15)

  1. 1. Method (300) for unloading an LCO2 emitter storage tank (4) into an LCO2 storage tank (6) on board a ship (100), wherein the method (300) comprises the steps: Unloading (302) of liquid LCO2 (LB) from the LCO2 emitter storage tank (4) into the LCO2 storage tank (6) on board the ship (100), whereby a partial stream of liquid LCO2 (LB*) is diverted during unloading (302), Evaporation (304) of the diverted partial stream of liquid LCO2 (LB*), in particular by means of a heat exchanger (14), so that a partial stream of vaporous LCO2 (VB*) is produced, Extraction (306) of vaporous LCO2 (VA) from the LCO2 storage tank (6) on board the ship (100), Condensation (308) of the extracted vaporous LCO2 (VA) against the diverted partial stream of LCO2 (LB*) from the LCO2 emitter storage tank (4), in particular by means of the heat exchanger (14), so that a stream of liquid LCO2 (LA) is produced, wherein the evaporated diverted partial stream (VB*) is returned to the LCO2 emitter storage tank (4).
  2. 2. Method (300) according to claim 1, wherein the LCO2 emitter storage tank (4) is arranged on land or on another ship.
  3. 3. Method (300) according to claim 1 or 2, wherein the stream of liquid LCO2 (LA) is fed into the LCO2 storage tank (6) on board the ship (100).
  4. 4. Method (300) according to one of the preceding claims, wherein the evaporation (304) of the diverted partial stream of liquid LCO2 (LB*) and the condensation (308) of the extracted vaporous LCO2 (VA) against the diverted partial stream of LCO2 (LB*) from the LCO2 emitter storage tank (4) are carried out simultaneously.
  5. 5. Method (300) according to one of the preceding claims, wherein the branching off of the partial stream of liquid LCO2 (LB*) and/or the evaporation (304) of the branched partial stream of liquid LCO2 (LB*) and/or the condensation (308) of the extracted vaporous LCO2 (VA) against the diverted partial stream of LCO2 (LB*) from the LCO2 emitter storage tank (4) on board the ship (100).
  6. 6. Method (300) according to one of the preceding claims, wherein the onshore LCO2 emitter storage tank (4) does not have an onshore evaporator.
  7. 7. Method (300) according to one of the preceding claims, wherein the ship (100) after unloading the LCO2 emitter storage tank (4) into the LCO2 storage tank (6) on board the ship (100) unloads at least one further LCO2 emitter storage tank into the LCO2 storage tank (6) on board the ship (100).
  8. 8. Method (300) according to one of the preceding claims, wherein the evaporated diverted partial stream (VB*) is compressed before being returned to the LCO2 emitter storage tank (4).
  9. 9. System (2) for unloading an LCO2 emitter storage tank (4) into an LCO2 storage tank (6) comprising: a tank line (8, 26) that fluidly connects the LCO2 emitter storage tank (4) to the LCO2 storage tank (6) of the ship (100), wherein the tank line (8, 26) is configured to transfer LCO2 (LB) from the LCO2 emitter storage tank (4) to the LCO2 storage tank (6), a partial flow circuit (20) with a partial flow line (10a) fluidly connected to the tank line (8), which branches off a partial flow of LCO2 (LB*) from the tank line (8), a heat exchanger (14) fluidly connected to the partial flow line (10a), and a partial flow line (10b, 24) which connects the heat exchanger (14) to the a circulating line (16a) connects the LCO2 emitter storage tank (4) to the heat exchanger (14) in a fluid-conducting manner, so that vaporous LCO2 (VA) is supplied to the heat exchanger (14), wherein the heat exchanger (14) is configured to condense vaporous LCO2 (VA) extracted by means of the circulating line (16a) against the diverted partial flow of LCO2 (LB*) from the LCO2 emitter storage tank (4).
  10. 10. System (2) according to claim 9, wherein the circulating line (16a) is part of a gas circuit (22) which connects the LCO2 storage tank (6) on board the ship (100) to the heat exchanger (14), wherein the gas circuit (22) further comprises a circulating line (16c) which connects the heat exchanger (14) to the storage tank (6).
  11. 11. System (2) according to one of claims 9 or 10, wherein a compressor (18) is arranged between the storage tank (6) and the heat exchanger (14).
  12. 12. System (2) according to one of claims 9 to 11, wherein a compressor (25) is arranged between the LCO2 emitter storage tank (4) and the heat exchanger (14).
  13. 13. System (2) according to one of claims 9 to 11, wherein the heat exchanger (14) and/or the partial flow line (10a, 10b) and/or the gas circuit (22) are arranged on board the ship (100).
  14. 14. System (2) according to any one of claims 9 to 13, wherein the LCO2 emitter storage tank (4) is part of a land facility (200) or another ship.
  15. 15. Ship (100) for unloading an LCO2 emitter storage tank (4), comprising: an LCO2 storage tank (6), a tank line (8) configured to fluidly connect an LCO2 emitter storage tank (4) to the LCO2 storage tank (6) of the ship (100), wherein the tank line (8) is configured to transfer LCO2 (LB) from the LCO2 emitter storage tank (4) to the LCO2 storage tank (6); a partial flow line (10a) fluidly connected to the tank line (8), which branches off a partial flow of LCO2 (LB*) from the tank line (8), a heat exchanger (14) fluidly connected to the partial flow line (10a) and a partial flow line (10b) which is configured to fluidly connect the heat exchanger (14) to a shore system return line (24), a recirculation line (16a) which connects the LCO2 storage tank (6) of the ship (100) to the heat exchanger (14) so that vaporous LCO2 (VA) is supplied to the heat exchanger (14), wherein the heat exchanger (14) is configured to condense vaporous LCO2 (VA) extracted via the circulating line (16a) against the diverted partial flow of LCO2 (LB*) from the LCO2 emitter storage tank (4).

Description

Bremen, April 7, 2025 Our reference: TA 3024-02WO KGG/CHA/jga Publisher/owner: TGE Marine Gas Engineering GmbH Official file number: Subsequent registration TGE Marine Gas Engineering GmbH, Mildred-Scheel-Straße 1, 53175 Bonn Method for unloading an LCO2 emitter storage tank into an LCO2 storage tank on board a ship, as well as the system and ship concerned. The invention relates to a method for unloading an LCO2 emitter storage tank into an LCO2 storage tank on board a ship, wherein the method comprises the step: unloading liquid LCO2 from the LCO2 emitter storage tank into the LCO2 storage tank on board the ship. Such methods for unloading an LCO2 emitter storage tank into an LCO2 storage tank on board a ship are known in the art. They are used in the context of so-called CO2 capture and storage. According to such concepts, CO2 is liquefied at the source, e.g., industrial plants, and transported from there to emitter storage tanks, which could be located in appropriate terminals on land. Using appropriately equipped ships, i.e., ships that have at least one or more LCO2 storage tanks, the liquefied CO2 can be transported economically to an interim or final storage site. A vessel specializing in LC02 transport typically calls at several LCO2 emitter storage tanks and transfers the LCO2 from each emitter storage tank to at least one LCO2 storage tank on board the vessel. The LCO2 in the LCO2- The emitter storage tanks can originate from various production processes, e.g., from cement production or from other sources. combustion processes, where the specifications of LCO2 can differ significantly. During the transport of LCO2 in the at least one LCO2 storage tank on board the ship, it must be ensured that the pressure inside the storage tank remains within defined pressure limits. To guarantee this even during the unloading of the LCO2 emitter storage tank and thus the loading of the LCO2 storage tank on board the ship, the use of a so-called vapor recirculation system is known, in which vaporous LCO2, which forms in the LCO2 storage tank on board the ship during loading, is returned to shore. This vaporous LCO2 is required to keep the pressure in the LCO2 emitter storage tanks on shore constant during the loading of the LCO2 storage tank on board the ship. A disadvantage of this approach, however, is that the prior art of vapor recirculation would result in a mixing of the LCO2 contained in the ship's onboard storage tank with the LCO2 contained in the emitter's storage tank. In other words, LCO2 from different emitters could be mixed into their respective emitter storage tanks, a phenomenon also known as cross-contamination. This is an undesirable condition, as unpredictable reactions and interactions between different components of the respective LCO2 compositions are possible. It was therefore the object of the present invention to at least partially overcome the disadvantages known from the prior art. In particular, a method for unloading an LCO2 emitter storage tank into an LCO2 storage tank on board a ship was to be provided, in which the mixing of different LCO2 specifications, the so-called cross-contamination, is effectively avoided. The method solves the problem described above by diverting a partial stream of the liquefied LCO2 during unloading and by the following steps: evaporating the diverted partial stream of liquid LCO2, in particular by means of a heat exchanger, so that a partial stream of vaporous LCO2 is produced; extracting vaporous LCO2 from the LCO2 storage tank on board the ship; condensing the extracted vaporous LCO2 against the diverted partial stream of LCO2 from the LCO2 emitter storage tank, in particular by means of the heat exchanger, so that a stream of liquid LCO2 is produced; and returning the evaporated diverted partial stream to the LCO2 emitter storage tank. The invention takes advantage of the knowledge that a mixing of LCO2 from different emitters can be effectively avoided by... A partial stream of the charging current from the emitter to the ship is evaporated, while vaporous LCO2 from the LCO2 storage tank on board the ship is condensed against the partial stream from the LCO2 emitter storage tank. The diverted evaporated partial stream is returned to the LCO2 emitter storage tank. This prevents LCO2 from entering the LCO2 emitter storage tank from the storage tank on board the ship. Furthermore, the method according to the invention allows the pressure in the LCO2 emitter storage tank, which is preferably located on land, to be controlled without the use of shore-based evaporators and heat for evaporation. The pressure in the LCO2 storage tanks on board the ship is, in turn, controlled without the need for a high-performance recondensation system with high investment costs and energy consumption to handle the displaced volume during this process. This is preferable because the overall costs of LCQ2 disposal should be kept low, and in this way the ships used for