KR-102964545-B1 - New Carbon Dioxide Offshore Transfer and Storage System

KR102964545B1KR 102964545 B1KR102964545 B1KR 102964545B1KR-102964545-B1

Abstract

The present invention discloses a CO2 marine transport and storage system, wherein the system is composed of five parts: CO2 transport, CO2 loading/unloading, CO2 transport, CO2 injection, and CO2 storage; when dock loading conditions are met, the CO2 land storage terminal is transported to a CO2 supply device via a land pipeline and supplied to a CO2 transport vessel, and upon arrival at the destination, unloads at the dock via a CO2 transport system and is transported to a CO2 injection module (23) via a pipeline and injected into a land or seabed CO2 storage facility for storage. If dock loading conditions are not met, the CO2 onshore storage terminal transfers the CO2 to the offshore floating storage device via a pipeline, the CO2 transport vessel moors to the offshore floating storage device via tandem mooring or parallel mooring, completes the supply of CO2 via hose transfer, and when the CO2 transport vessel arrives at the target sea area, transfers the CO2 to the offshore injection platform via an internal turret unit, a subsea pipeline , and an underwater riser, and injects and stores it in a subsea CO2 storage tank via a subsea wellhead. The present invention can be applied to the offshore transfer and storage of CO2 under any conditions.

Inventors

정웨이
두신
우난
마쥔
창리융
뤼옌
장메이
양양
쑨카이챵
장의밍
펑귀성
쑨챵
장린타오
궈챵
??청룽
펑둥성
판솨이

Assignees

다렌 쉽빌딩 인더스트리 씨오 아이티디

Dates

Publication Date: 20260513
Application Date: 20230117
Priority Date: 20220118

Claims (8)

a. A method in which, if loading at the dock is possible, the CO2 onshore storage terminal transports the CO2 to a CO2 supply device via an onshore pipeline and supplies it to a CO2 transport vessel; upon arrival at the destination, unloads the CO2 at the dock via a CO2 transfer system, transports it to a CO2 injection module via a pipeline, and injects and stores it in an onshore or underwater CO2 storage facility; In cases where dock loading is impossible, b. A method in which a CO2 onshore storage terminal transfers to a CO2 offshore floating storage unit via a pipeline, a CO2 transport vessel moors to the CO2 offshore floating storage unit via a tandem mooring or parallel mooring method, completes the supply of CO2 via hose transfer, and when the CO2 transport vessel arrives at the target sea area, moors to and secures the position of the CO2 offshore floating storage unit equipped with an internal turret via a tandem mooring or parallel mooring method, completes the unloading of CO2 via hose transfer, transfers to a CO2 offshore injection platform via an internal turret unit, a subsea pipeline, and an underwater riser, and injects and stores CO2 in a subsea CO2 storage facility via a subsea wellhead; or c. A method may be selected in which the CO2 onshore storage terminal transports CO2 to a CO2 offshore floating storage unit with an internal turret via a pipeline, and after the CO2 offshore floating storage unit with an internal turret arrives at the target area, transports CO2 to an offshore injection platform via an internal turret unit, a seabed pipeline, and an underwater riser, and injects it into a seabed CO2 storage facility via a seabed wellhead for storage, wherein The above steps a, b, or c are, S1. Liquid CO2 is injected into a storage tank, wherein the storage tank includes a tank body (95) that stores liquid CO2 and has an insulation layer installed therein, and on each side of the tank body (95), a discharge device (92) and an injection device (91) of a one-way valve are installed, respectively, and the center of gravity of the tank body (95) is tilted toward one side of the discharge device (92); a nitrogen gas generator (94) is installed inside one side of the tank body (95) where the injection device (91) is located; the discharge device (92) includes a pressure-controlled discharge device (96); and the storage tank is also composed of a pressure-controlled valve; S2. Transport the above storage tank to an offshore storage area via a vessel; S3. The above storage tank is immersed in seawater, and the storage tank sinks vertically due to the action of the center of gravity, with one side of the discharge device (92) located at the bottom; S4. When the pressure inside the storage tank increases and reaches the opening pressure of the discharge device (96), the discharge device (96) is opened to release CO2 and achieve pressure relief; S5. When the storage tank sinks to a depth where the external seawater pressure reaches the opening pressure of the injection device (91), the injection device (91) opens and seawater flows into the storage tank; S6. When the storage tank sinks to the CO2 storage depth, the injection device (91) and the discharge device (92) are fully opened, and liquefied CO2 flows out of the storage tank; when it is fully flowed out, external seawater flows into the storage tank completely, and the injection device (91) is closed; S7. A nitrogen gas generator (94) is operated to generate nitrogen gas, the storage tank is floated after discharging seawater, and the discharge device (92) is closed; S8. A CO2 offshore transport and storage system characterized by the above-mentioned storage tank being floated above the sea surface and including recovery and recycling.
delete
In claim 1, A CO2 marine transport and storage system characterized by fixing ballast in the storage tank so that the center of gravity is tilted toward one side of the discharge device (92).
In claim 1, A CO2 maritime transport and storage system characterized by having a satellite positioning device (93) for positioning during recovery fixed to the storage tank.
In claim 1, A CO2 marine transport and storage system characterized by installing a position detection device in the storage tank to check the sinking depth of the storage tank; and installing an open-close remote control device in the injection device (91) and the discharge device (92), respectively, to open and close the detected storage tank at a fixed depth.
In claim 1, A CO2 marine transport and storage system characterized by the above-mentioned storage tank having a maximum allowable pressure of 30 bar.
In claim 1, A CO2 offshore transport and storage system characterized in that, in step S6, the CO2 storage depth is at least 1000m.
In any one of claims 1, 3 to 7, A CO2 marine transport and storage system characterized by: when the CO2 in the pipeline is liquefied CO2 , the pressure range in the pipeline is 0.4 to 7.39 MPa; when the CO2 in the pipeline is in a supercritical state, the temperature in the pipeline is higher than 31.3℃ and the pressure in the pipeline is greater than 7.39 MPa; when the CO2 in the pipeline is vaporized CO2 , the pressure range in the pipeline is 0 to 7.39 MPa; and the CO2 transport vessel uses a Type C tank, and the CO2 storage pressure in the Type C tank is 0.4 MPa to 2.1 MPa.

Description

New Carbon Dioxide Offshore Transfer and Storage System The present invention relates to the field of carbon dioxide ( CO2 ) capture, transport, and storage (CCUS), and in particular refers to a process of separating CO2 from industrial processes, energy use, or the atmosphere and storing it in terrestrial or marine geological layers to achieve a permanent reduction in CO2 emissions. Actively developing CCUS technology under the goal of carbon neutrality is a strategic choice to reduce future carbon dioxide emissions and ensure national energy security, and is also an important means of building an ecological civilization and realizing sustainable development. Compared to developing new alternative energy sources, CCUS technology can effectively reduce greenhouse gas emissions in the short term. Furthermore, the development of CCUS technology helps to reconcile the conflict between the use of fossil energy sources and carbon emission reduction policies. Additionally, CCUS technology development is a key technological means of maintaining the flexibility of the power system under the goal of carbon neutrality, and it can provide solutions for achieving carbon zero in energy-intensive industries, which helps to amplify China's voice in the international low-carbon sector. China has placed great importance on the development of CCUS technology and has steadily promoted its research, development, and application on land. However, research on offshore CO2 storage began later than in other countries, and there is currently a gap in the fields of CO2 marine transport and seabed storage. Offshore carbon storage has greater potential than onshore carbon storage and offers advantages in terms of reliability and environmental friendliness due to its distance from human settlements. China's major carbon sources are distributed in coastal areas, and adjacent ocean basins possess excellent carbon storage conditions. Furthermore, our country possesses outstanding capabilities in the design and manufacturing of vessels and marine equipment related to offshore carbon storage, thus providing favorable foundational conditions for implementing offshore CCUS. Although the cost of offshore carbon storage is slightly higher than that of onshore storage, the flexibility of maritime transport allows seabed storage facilities to serve a wider range of carbon sources. Moreover, with the development of domestic carbon tax policies and carbon trading markets, the implementation of offshore CCUS appears more feasible from an economic perspective. Figure 1 is an overall layout of the CO2 onshore storage of the present invention. Figure 2 is an overall layout of the CO2 subsea storage of the present invention. Figure 3 is the first part of the system flowchart of the present invention. Figure 4 is the second part of the system flowchart of the present invention. Figure 5 is the third part of the system flowchart of the present invention. Figure 6 is the fourth part of the system flowchart of the present invention. FIG. 7 is a schematic diagram of the structure of a liquefied CO2 transport storage tank used in the method of the present invention. Figure 8 is a schematic diagram showing the structure of a discharge device in the storage tank of Figure 7 in part. FIG. 9 is a schematic diagram showing the state of transporting a liquefied CO2 transport storage tank by a vessel in the method of the present invention. Figure 10 is a schematic diagram showing the process of storing CO2 in a storage area. Figure 11 is a schematic diagram showing the state in which the storage tank has completed the release of liquefied CO2 . Figure 12 is a schematic diagram showing the return process of the storage tank. Figure 13 is a schematic diagram showing the recovery state of the storage tank. Figure 14 is a schematic diagram showing the state of recovery of the ship's storage tank. FIG. 1 is an overall layout of CO2 onshore storage. CO2 (1) generated by industrial activity is collected through a CO2 capture module (2) and stored in liquid form in a CO2 onshore storage terminal (3). Since the CO2 onshore storage terminal (3) is located far from the onshore storage facility (26), CO2 must be transported when it is necessary to store CO2 . The liquefied CO2 is transported to an onshore CO2 supply arm (4) via an onshore CO2 transport pipeline (5) and supplied to a CO2 transport vessel (7) anchored at the dock. Additionally, the CO2 stored in the CO2 onshore storage terminal (3) is transported to a catenary single-point mooring device (11) via a seabed CO2 transport pipeline (6) and an underwater riser (13), and then supplied to the CO2 transport vessel (7) again via a floating hose (12). In addition, CO2 stored in the CO2 onshore storage terminal (3) is transported to the soft yoke single-point mooring device (16) through the seabed CO2 transport pipeline (6) and underwater riser (13), and then transferred to the CO2 transport vessel (7) through the bridging