Carbon dioxide storage device and storage method

Abstract

The present invention belongs to the technical field of carbon dioxide sequestration, and discloses a carbon dioxide sequestration device and a carbon dioxide sequestration method. The carbon dioxide sequestration device includes an operation platform, a booster pump, an injection casing, an injection assembly, and a driving assembly; the booster pump is arranged on the operation platform, and the booster pump is used to inject supercritical carbon dioxide and liquid carbon dioxide into the injection casing; the injection assembly includes an injection pipe and an inner casing, the injection pipe is connected to the end of the injection casing, and injection slits are formed on the side wall of the injection pipe; the inner casing has an initial position and a stop position in the injection pipe. In the initial position, the inner casing closes the injection slits, and the supercritical carbon dioxide is injected into the saline aquifer through the second port; in the stop position, the inner casing opens the injection slits, and the liquid carbon dioxide is injected into the fault through the injection slits. The carbon dioxide sequestration device can enhance the tightness of the fault, strengthen the mechanical strength of the fault, and reduce the risk of leakage of the stored carbon dioxide.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide storage, and in particular, to a carbon dioxide storage device and a storage method. Background Art

[0002] Carbon dioxide storage refers to injecting carbon dioxide into geological formations at a depth range of 800 meters to 3,500 meters underground through engineering means, so as to achieve the permanent storage of carbon dioxide and reduce the carbon dioxide content in the atmosphere. Geological bodies that can be used for carbon dioxide storage include onshore saline aquifers, submarine saline aquifers, and depleted oil and gas fields, etc. Among them, saline aquifer storage refers to using underground deep saline aquifers that are not of mining value to store carbon dioxide. The specific method is to use drilling tools to drill vertical wells and horizontal wells in the saline aquifer and lower injection casings, and then inject supercritical carbon dioxide into the saline aquifer through the injection casings. This is the main method of carbon dioxide storage.

[0003] Existing methods for storing carbon dioxide, such as a method for storing carbon dioxide provided in the invention patent with the application number CN 201210497862.0, drill wells in the saline aquifer and perforate the fracture zone, inject liquid carbon dioxide into the saline aquifer through a booster pump, and finally drill and fill to seal, so as to permanently store carbon dioxide. However, this carbon dioxide storage method has the following problems: the injected carbon dioxide will increase the injection seam pressure of the formation, thereby reducing the shear strength of the fault, and carbon dioxide will also undergo corresponding chemical reactions with the fault rock, further reducing the mechanical strength of the rock. All of the above factors will cause fault activation and fault slip, thereby causing carbon dioxide leakage. Summary of the Invention

[0004] The purpose of the present invention is to provide a carbon dioxide storage device and a storage method, which can enhance the tightness of underground faults, strengthen the mechanical strength of underground faults, and reduce the risk of leakage of stored carbon dioxide.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A carbon dioxide storage device, comprising:

[0007] An operation platform;

[0008] A supercritical carbon dioxide storage tank, a liquid carbon dioxide storage tank, and a booster pump, all of which are arranged on the operation platform, and the booster pump can be selectively connected to the supercritical carbon dioxide storage tank or the liquid carbon dioxide storage tank;

[0009] An injection casing, connected to the booster pump, for transporting pressurized supercritical carbon dioxide and liquid carbon dioxide;

[0010] An injection component, the injection component includes an injection pipe and an inner sleeve. The injection pipe has a first port and a second port. The first port is connected to the end of the injection sleeve, and the second port is located in the saline aquifer. Injection slits are formed on the side wall of the injection pipe, and the injection slits are located in the fault. The inner sleeve is arranged in the injection pipe and is slidably matched with the inner wall of the injection pipe. The inner sleeve has an initial position and a stop position in the injection pipe. In the initial position, the booster pump is communicated with the supercritical carbon dioxide storage tank, the inner sleeve closes the injection slit, and the supercritical carbon dioxide is injected into the saline aquifer through the second port. In the stop position, the booster pump is communicated with the liquid carbon dioxide storage tank, the inner sleeve opens the injection slit, and the liquid carbon dioxide is injected into the fault through the injection slit.

[0011] A driving component, the driving component is used to drive the inner sleeve to move between the initial position and the stop position.

[0012] Preferably, the driving component includes a first electromagnet and a second electromagnet which are spaced on the outer wall of the injection pipe. The first electromagnet is used to adsorb the inner sleeve so that the inner sleeve is fixed at the initial position. The second electromagnet is used to adsorb the inner sleeve so that the inner sleeve moves to the stop position.

[0013] Preferably, both the first electromagnet and the second electromagnet are of circular ring structure.

[0014] Preferably, there are a plurality of injection slits, and the plurality of injection slits are uniformly arranged on the side wall of the injection pipe in the circumferential direction.

[0015] Preferably, the carbon dioxide storage device further includes a plugging member, and the plugging member is used to plug the second port of the injection pipe.

[0016] Preferably, the carbon dioxide storage device further includes a stop member, and the stop member is fixedly arranged on the inner wall of the injection pipe near the second port, and the stop member is used to stop the plugging member.

[0017] Preferably, an inner concave groove is machined at one end of the stop member close to the first port.

[0018] Preferably, when the inner sleeve is in the stop position, the inner sleeve abuts against one end of the stop member close to the first port, and the plugging member abuts against one end of the inner sleeve close to the first port.

[0019] Preferably, an inner concave groove is machined at one end of the inner sleeve close to the first port.

[0020] A method for carbon dioxide sequestration, using the above-mentioned carbon dioxide sequestration device, includes the following steps:

[0021] S1. Fix the inner sleeve at the initial position through the driving assembly, connect the booster pump and the supercritical carbon dioxide storage tank and turn on the booster pump, transport the supercritical carbon dioxide through the injection sleeve to the injection pipe, and inject it into the saline aquifer through the second port;

[0022] S2. Turn off the booster pump, and drive the inner sleeve to move to the stop position through the driving assembly;

[0023] S3. Connect the booster pump and the liquid carbon dioxide storage tank and turn on the booster pump, transport the liquid carbon dioxide through the injection sleeve to the injection pipe, and inject it into the fault through the injection slit.

[0024] The beneficial effects of the present invention are as follows:

[0025] For the carbon dioxide sequestration device provided by the present invention, when the inner sleeve is in the initial position, the inner sleeve blocks the injection slit. The supercritical carbon dioxide in the supercritical carbon dioxide storage tank is transported to the injection sleeve through the booster pump, and then the supercritical carbon dioxide can be injected into the saline aquifer through the second port of the injection pipe, thus completing the sequestration of carbon dioxide. The driving assembly is used to drive the inner sleeve to move to the stop position, so that the inner sleeve opens the injection slit, and the liquid carbon dioxide in the liquid carbon dioxide storage tank is transported to the injection sleeve through the booster pump. Then the liquid carbon dioxide can be injected into the fault through the injection slit of the injection pipe. The liquid carbon dioxide can react with the water in the fault pores to generate carbon dioxide hydrate, and the carbon dioxide hydrate can cement the fault gouge particles, thereby reducing the permeability of the fault and enhancing the tightness of the fault. When the fault is activated, the carbon dioxide hydrate will block it layer by layer in the fault section. In addition, the mechanical strength of the carbon dioxide hydrate is greater than that of the fault gouge, which can play an anchoring role on both sides of the fault, thereby inhibiting the fault slip and the deterioration of the mechanical properties of the fault, and further reducing the leakage risk of the carbon dioxide stored in the saline aquifer. Due to the provision of the driving assembly, the driving assembly realizes the separate injection of supercritical carbon dioxide and liquid carbon dioxide by driving the movement of the inner sleeve between the initial position and the stop position, without additionally setting an injection assembly, thus reducing the production cost.

[0026] Using this carbon dioxide sequestration method, since an injection assembly is provided, by driving the inner casing through the driving assembly to change the position of the inner casing in the injection pipe, it is possible to separately sequester supercritical carbon dioxide into the saline aquifer and inject liquid carbon dioxide into the fault. After the liquid carbon dioxide is injected into the fault, it can react with the water in the fault pores to form carbon dioxide hydrate, increasing the mechanical strength of the fault and improving the tightness of the fault, thereby reducing the risk of carbon dioxide leakage due to geological disasters and increasing the sequestration volume and sequestration efficiency of carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the carbon dioxide sequestration device provided by the specific embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of the injection assembly when the inner casing is in the initial position provided by the specific embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of the injection assembly when the inner casing is in the stop position provided by the specific embodiment of the present invention.

[0030] In the figure:

[0031] 100 - saline aquifer;

[0032] 200 - fault;

[0033] 1 - operation platform;

[0034] 2 - supercritical carbon dioxide storage tank;

[0035] 3 - liquid carbon dioxide storage tank;

[0036] 4 - booster pump;

[0037] 5 - injection casing;

[0038] 6 - injection assembly; 61 - injection pipe; 611 - first port; 612 - second port; 62 - inner casing;

[0039] 7 - driving assembly; 71 - first electromagnet; 72 - second electromagnet; 73 - third electromagnet;

[0040] 8 - sealing member;

[0041] 9 - stop member.

[0042] 10 - control assembly; 101 - control console; 102 - control cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0044] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0046] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", and "left" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0047] Such as Figure 1 - Figure 2As shown in the figure, the present invention provides a carbon dioxide storage device, which includes an operation platform 1, a supercritical carbon dioxide storage tank 2, a liquid carbon dioxide storage tank 3, a booster pump 4, an injection casing 5, an injection assembly 6 and a drive assembly 7. The supercritical carbon dioxide storage tank 2, the liquid carbon dioxide storage tank 3 and the booster pump 4 are all arranged on the operation platform 1, and the booster pump 4 can be selectively communicated with the supercritical carbon dioxide storage tank 2 or the liquid carbon dioxide storage tank 3; the injection casing 5 is communicated with the booster pump 4 and is used for transporting the supercritical carbon dioxide and the liquid carbon dioxide after pressurization. In this embodiment, the supercritical carbon dioxide storage tank 2 and the liquid carbon dioxide storage tank 3 are respectively connected to the booster pump 5 through a first pipeline and a second pipeline, and valves are installed on both the first pipeline and the second pipeline to open and close the pipelines.

[0048] The injection assembly 6 includes an injection pipe 61 and an inner sleeve 62. The injection pipe 61 has a first port 611 and a second port 612. The first port 611 is connected to the end of the injection sleeve 5, and the second port 612 is located in the saline aquifer 100. Injection slits are formed on the side wall of the injection pipe 61, and the injection slits are located in the fault 200. The inner sleeve 62 is arranged in the injection pipe 61 and is slidably matched with the inner wall of the injection pipe 61. The inner sleeve 62 has an initial position and a stop position in the injection pipe 61. At the initial position, the booster pump 4 is communicated with the supercritical carbon dioxide storage tank 2, the inner sleeve 62 closes the injection slits, and the supercritical carbon dioxide is injected into the saline aquifer 100 through the second port 612. At the stop position, the booster pump 4 is communicated with the liquid carbon dioxide storage tank 3, the inner sleeve 62 opens the injection slits, and the liquid carbon dioxide is injected into the fault 200 through the injection slits. The driving assembly 7 is used to drive the inner sleeve 62 to move between the initial position and the stop position.In this embodiment, the inner sleeve 62 is inserted into the injection pipe 61, and the outer wall of the inner sleeve 62 is in sliding fit with the inner wall of the injection pipe 61; when the inner sleeve 62 is in the initial position, the inner sleeve 62 can block the injection slot, thereby closing the injection slot. The operator closes the valve on the second pipeline and opens the valve on the first pipeline, so that the booster pump 4 is connected to the supercritical carbon dioxide storage tank 2, and the booster pump 4 is started, thereby transporting the supercritical carbon dioxide into the injection casing 2. Subsequently, the supercritical carbon dioxide is injected into the saline aquifer 100 through the second port 612 of the injection pipe 61, thereby completing the storage of carbon dioxide; then the operator closes the booster pump 4 and drives the inner sleeve 62 to move to the stop position through the driving assembly 7. At this time, the inner sleeve 62 leaves the injection slot to open the injection slot. The operator closes the valve on the first pipeline and opens the valve on the second pipeline, so that the booster pump 4 is connected to the liquid carbon dioxide storage tank 3, and the booster pump 4 is started, thereby transporting the liquid carbon dioxide into the injection casing 2. Subsequently, the liquid carbon dioxide can be injected into the fault 200 through the injection slot of the injection pipe 61. The temperature of the liquid carbon dioxide entering the fault 200 is below minus 30 degrees Celsius. There is fault gouge distributed in the fault 200. When the low-temperature liquid carbon dioxide is injected into the fault 200, as the temperature rises, the low-temperature liquid carbon dioxide can react with the water in the pores of the fault gouge to produce carbon dioxide hydrate. The formation temperature and pressure will cause the shallower the formation, the larger the range of carbon dioxide hydrate formation. The carbon dioxide is injected in a stratified step in the fault 200, and the generated carbon dioxide hydrate will penetrate through the fault gouge into the formations on both sides of the fault 200. Because the mechanical strength of the carbon dioxide hydrate is greater than that of the fault gouge, the carbon dioxide hydrate plays an anchoring role on both sides of the fault 200, inhibiting the slip of the fault 200. When the fault 200 is activated, the broken carbon dioxide hydrate is irregular in shape, which will increase the friction coefficient and friction stability of the slip of the fault 200. In addition, the formation of carbon dioxide hydrate will consume the water in the fault gouge, reduce the carbon dioxide-water-rock reaction of the fault 200, and inhibit the deterioration of the mechanical properties of the fault 200; in addition, the formation of carbon dioxide hydrate will cement the fault gouge particles, which will reduce the permeability of the fault gouge. When the fault 200 is activated, carbon dioxide will escape upward along the fault 200. The carbon dioxide hydrate will block it layer by layer in the fault 200 section to prevent carbon dioxide from escaping along the fault 200, further reducing the risk of carbon dioxide leakage due to geological disasters. Due to the provision of the driving assembly 7, the driving assembly 7 realizes the separate injection of supercritical carbon dioxide and liquid carbon dioxide by driving the movement of the inner sleeve 62 between the initial position and the stop position, without the need to set up another set of injection assemblies 6, reducing the production cost.It should be noted that, according to the formation structure, the carbon dioxide storage device has multiple layers of horizontal injection casings 5, thus including multiple injection pipes 61 for carbon dioxide storage at different depths. The length of each injection pipe 61 is determined according to the structures of the saline aquifers 100 and faults 200 of each layer, as long as it is ensured that the injection slit is located in the fault 200 and the second port 612 is located in the saline aquifer 100.

[0049] Furthermore, as Figure 2 - Figure 3 shown, the driving assembly 7 includes a first electromagnet 71 and a second electromagnet 72 that are spaced apart on the outer wall of the injection pipe 61. The first electromagnet 71 is used to adsorb the inner casing 62 to fix the inner casing 62 in the initial position; the second electromagnet 72 is used to adsorb the inner casing 62 to move the inner casing 62 to the stop position. In this embodiment, the first electromagnet 71 and the second electromagnet 72 are fixedly installed on the outer wall of the injection pipe 61. The first electromagnet 71 and the second electromagnet 72 have the same structure and are both composed of an iron core and a wound coil, with a housing installed outside. When the coil is energized, the iron core is magnetized by the magnetic field of the energized coil and thus has magnetism, enabling the iron core to adsorb steel products; the inner casing 62 is made of a steel pipe. When the coil of the first electromagnet 71 is de-energized and the coil of the second electromagnet 72 is energized, the iron inner casing 62 will be adsorbed by the second electromagnet 72 and move to the stop position; using an electromagnet to control the movement of the inner casing 62 is simple, reliable, and not easily damaged; in addition, in order to better fix the inner casing 62 in the initial position, a third electromagnet 73 is also provided on the outer wall of the injection pipe 61. There is a certain distance between the third electromagnet 73 and the first electromagnet 71. The third electromagnet 73 and the first electromagnet 71 respectively adsorb both ends of the inner casing 62 to fix the inner casing 62 in the initial position, improving the adsorption strength and effectively preventing supercritical carbon dioxide from entering the fault 200 through the injection slit.

[0050] Specifically, both the first electromagnet 71 and the second electromagnet 72 are of a circular ring structure. In this embodiment, both the first electromagnet 71 and the second electromagnet 72 are circular ring-shaped electromagnets of a circular ring structure, arranged around the injection pipe 61 on the outer wall of the injection pipe 61. The circular ring structure increases the contact area between the electromagnet and the injection pipe 61, thereby increasing the adsorption area of the first electromagnet 71 and the second electromagnet 72, making it more stable and reliable when adsorbing the inner casing 62.

[0051] Furthermore, there are multiple injection slits, and the multiple injection slits are evenly opened on the side wall of the injection pipe 61 in the circumferential direction. In this embodiment, the injection slits are long strip-shaped slits, axially opened on the side wall of the injection pipe 61, increasing the contact area between the injection slits and the fault 200. At the same time, the multiple injection slits are evenly opened in the circumferential direction of the injection pipe 61, enabling the liquid carbon dioxide to react evenly and fully with the water in the fault 200 around the injection pipe 61, thereby sealing and strengthening the fault 200 in all directions.

[0052] Further, as shown in Figure 3 , the carbon dioxide storage device further includes a plugging member 8, and the plugging member 8 is used to plug the second port 612 of the injection pipe 61. In this embodiment, the stopping position of the inner sleeve 62 is closer to the second port 612 than the initial position. When the sleeve 62 moves to the stopping position, the operator lowers the plugging member 8 in the injection sleeve 2, so as to plug the second port 612 of the injection pipe 61. At this time, the second port 612 of the injection pipe 61 is plugged and the injection slot is opened. Therefore, the liquid carbon dioxide entering from the first port 611 will be injected into the fault 200 through the injection slot; the plugging member 8 can prevent the liquid carbon dioxide from flowing out of the second port 612, so that all the liquid carbon dioxide is injected into the fault 200 through the injection slot.

[0053] Further, as shown in Figure 3 , the carbon dioxide storage device further includes a stopper 9, and the stopper 9 is fixedly arranged on the inner wall of the injection pipe 61 near the second port 612, and the stopper 9 is used to stop the plugging member 8. In this embodiment, the stopper 20 is fixedly arranged on the inner wall of the injection pipe 61. When the first electromagnet 71 is powered off and the second electromagnet 72 is powered on, the inner sleeve 62 will move to the stopping position under the magnetic adsorption force of the second electromagnet 72. The stopper 20 is also an annular electromagnet, so as to increase the adsorption force on the inner sleeve 62, make the inner sleeve 62 stably adsorbed at the stopping position, and improve the reliability of the carbon dioxide storage device; after the inner sleeve 62 moves to the stopping position, the operator lowers the plugging member 9 into the injection pipe 61 through the injection sleeve 2. Since the stopper 20 is fixed on the inner wall of the injection pipe 61, the plugging member 9 can firmly abut against the stopper 20, so as to achieve a good plugging effect.

[0054] Specifically, as shown in Figure 2 , an inner concave groove is machined at one end of the stopper 20 close to the first port 611. In this embodiment, the stopper 20 is annular, and an inner concave groove is machined at one end of the stopper 20 close to the first port 611. When the inner sleeve 62 is in the initial position, the operator allows the supercritical carbon dioxide to flow into the injection pipe 61. The inner concave groove can enable the supercritical carbon dioxide to flow stably through the stopper 20, improving the injection efficiency of the supercritical carbon dioxide and the stability of storage.

[0055] Specifically, as shown in Figure 3As shown, when the inner sleeve 62 is in the stop position, the inner sleeve 62 abuts against one end of the stop member 20 close to the first port 611, and the plugging member 9 abuts against one end of the inner sleeve 62 close to the first port 611. In this embodiment, after the driving assembly 7 drives the inner sleeve 62 to move to the stop position, the inner sleeve 62 abuts against the stop member 20. An outer convex groove matching the inner concave groove of the stop member 20 is machined at one end of the inner sleeve 62 close to the second port 612. Therefore, the inner sleeve 62 can be fitted and abutted against the stop member 20. Then the operator places the plugging member 9 in the injection pipe 61. The plugging member 9 is cylindrical. The plugging member 9 abuts against the inner sleeve 62. The plugging member 9, the inner sleeve 62 and the stop member 20 abut tightly against each other, so that the plugging member 9 plugs the second port 612.

[0056] Further, as Figure 2 shown, an inner concave groove is machined at one end of the inner sleeve 62 close to the first port 611. In this embodiment, similar to the stop member 20, an inner concave groove is machined at one end of the inner sleeve 62 close to the first port 611. When the inner sleeve 62 is in the initial position, the operator allows supercritical carbon dioxide to flow into the injection pipe 61. The inner concave groove can enable the supercritical carbon dioxide to flow through the inner sleeve 62 stably, improving the injection efficiency of the supercritical carbon dioxide and the stability of sequestration.

[0057] Further, as Figure 1 shown, the carbon dioxide sequestration device further includes a control assembly 10. The control assembly 10 includes a console 101 and a control cable 102. The console 101 is arranged on the operation platform 1. The console 101 is respectively connected to the first electromagnet 71, the second electromagnet 72, the third electromagnet 73 and the stop member 9 through the control cable 102. In this embodiment, the console 101 is placed on the operation platform 1 on the sea surface. A power switch and a circuit system are arranged in the console 101. The operator can remotely control the opening and closing of the first electromagnet 71, the second electromagnet 72, the third electromagnet 73 and the stop member 9 on the console 101, improving the controllability and convenience of the carbon dioxide sequestration device.

[0058] This embodiment also provides a carbon dioxide sequestration method, using the above carbon dioxide sequestration device, including the following steps:

[0059] S1. Fix the inner sleeve 62 at the initial position by the driving component 7, connect the booster pump 5 and the supercritical carbon dioxide storage tank 2 and turn on the booster pump 4. Transport the supercritical carbon dioxide through the injection sleeve 2 to the injection pipe 61, and inject it into the saline aquifer 100 through the second port 612. Specifically, the operator operates the console 101 to turn on the first electromagnet 71 and the third electromagnet 73, and turn off the second electromagnet 72 and the stopper 20 to fix the inner sleeve 62 at the initial position. At this time, the inner sleeve 62 blocks and closes the injection slit on the side wall of the injection pipe 61. Then the operator turns on the valve on the first pipeline and starts the booster pump 5 at the same time, and presses the supercritical carbon dioxide in the supercritical carbon dioxide storage tank 3 into the injection sleeve 2, and injects it into the saline aquifer 100 through the second port 612 of the injection pipe 61, thus realizing the storage of supercritical carbon dioxide.

[0060] S2. Turn off the booster pump 5 and drive the inner sleeve 62 to move to the stop position by the driving component 10. Specifically, the operator turns off the valve on the first pipeline and the booster pump 5 to stop pressing the supercritical carbon dioxide into the injection sleeve 2. Then the operator operates the console 101 to turn off the first electromagnet 71 and the third electromagnet 73, and turn on the second electromagnet 72 and the stopper 20. The inner sleeve 62 moves to the stop position under the action of the magnetic adsorption force, thus opening the injection slit. When the inner sleeve 62 is in the stop position, the inner sleeve 62 abuts against the stopper 20 and fits with the stopper 20. Then the operator lowers the plugging member 9 so that the plugging member 9 abuts against the inner sleeve 62, thereby plugging the second port 612 of the injection pipe 61.

[0061] S3. Connect the booster pump 4 and the liquid carbon dioxide storage tank 3 and turn on the booster pump 4. Transport the liquid carbon dioxide through the injection sleeve 2 to the injection pipe 61, and inject it into the fault 200 through the injection slit. Specifically, the operator turns on the valve on the second pipeline and starts the booster pump 5 at the same time, and presses the low-temperature liquid carbon dioxide in the liquid carbon dioxide storage tank 4 into the injection sleeve 2, and injects it into the fault 200 through the injection slit of the injection pipe 61. After the injection is completed, just turn off the valve on the second pipeline.

[0062] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Carbon dioxide storage device, characterized in that, Comprising: An operation platform (1); A supercritical carbon dioxide storage tank (2), a liquid carbon dioxide storage tank (3), and a booster pump (4), all of which are arranged on the operation platform (1), and the booster pump (4) can be selectively communicated with the supercritical carbon dioxide storage tank (2) or the liquid carbon dioxide storage tank (3); An injection casing (5), which is communicated with the booster pump (4) and is used for transporting pressurized supercritical carbon dioxide and liquid carbon dioxide; An injection assembly (6), the injection assembly (6) includes an injection pipe (61) and an inner casing (62), the injection pipe (61) has a first port (611) and a second port (612), the first port (611) is connected to the end of the injection casing (5), the second port (612) is located in the saline aquifer (100), and injection slits are formed on the side wall of the injection pipe (61), and the injection slits are located in the fault (200); the inner casing (62) is arranged in the injection pipe (61) and is slidably matched with the inner wall of the injection pipe (61), and the inner casing (62) has an initial position and a stop position in the injection pipe (61); in the initial position, the booster pump (4) is communicated with the supercritical carbon dioxide storage tank (2), the inner casing (62) closes the injection slits, and the supercritical carbon dioxide is injected into the saline aquifer (100) through the second port (612); in the stop position, the booster pump (4) is communicated with the liquid carbon dioxide storage tank (3), the inner casing (62) opens the injection slits, and the liquid carbon dioxide is injected into the fault (200) through the injection slits; A driving assembly (7), the driving assembly (7) is used for driving the inner casing (62) to move between the initial position and the stop position.

2. The carbon dioxide storage device according to claim 1, wherein The driving assembly (7) includes a first electromagnet (71) and a second electromagnet (72) which are spaced apart and arranged on the outer wall of the injection pipe (61), the first electromagnet (71) is used for adsorbing the inner casing (62) to fix the inner casing (62) at the initial position; the second electromagnet (72) is used for adsorbing the inner casing (62) to move the inner casing (62) to the stop position.

3. The carbon dioxide storage device according to claim 2, characterized in that, Both the first electromagnet (71) and the second electromagnet (72) are of circular ring structure.

4. The carbon dioxide storage device according to claim 1, characterized in that, There are a plurality of the injection slits, and the plurality of injection slits are evenly arranged in the circumferential direction on the side wall of the injection pipe (61).

5. The carbon dioxide storage device according to claim 1, characterized in that The carbon dioxide storage device further includes a plugging member (8), and the plugging member (8) is used for plugging the second port (612) of the injection pipe (61).

6. The carbon dioxide storage device according to claim 5, characterized in that, The carbon dioxide storage device further includes a stop member (9), the stop member (9) is fixedly arranged on the inner wall of the injection pipe (61) close to the second port (612), and the stop member (9) is used for stopping the plugging member (8).

7. The carbon dioxide storage device according to claim 6, characterized in that, The end of the stop member (9) close to the first port (611) is processed with an inner concave groove.

8. The carbon dioxide storage device according to claim 6, characterized in that, When the inner sleeve (62) is in the stop position, the inner sleeve (62) abuts against one end of the stopper (9) close to the first port (611), and the plugging member (8) abuts against one end of the inner sleeve (62) close to the first port (611).

9. The carbon dioxide storage device according to claim 1, characterized in that, An inner concave groove is machined at one end of the inner sleeve (62) close to the first port (611).

10. A method for carbon dioxide sequestration, characterized in that, Using the carbon dioxide storage device according to any one of claims 1-9, comprising the following steps: S1. Fix the inner sleeve (62) at the initial position through the driving assembly (7), connect the booster pump (4) and the supercritical carbon dioxide storage tank (2) and turn on the booster pump (4), convey the supercritical carbon dioxide into the injection pipe (61) through the injection sleeve (5), and inject it into the saline aquifer (100) through the second port (612); S2. Turn off the booster pump (4), and drive the inner sleeve (62) to move to the stop position through the driving assembly (7); S3. Connect the booster pump (4) and the liquid carbon dioxide storage tank (3) and turn on the booster pump (4), convey the liquid carbon dioxide into the injection pipe (61) through the injection sleeve (5), and inject it into the fault (200) through the injection slit.

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