Conveying device for carbon dioxide flooding

Abstract

The invention relates to the technical field of conveying devices, and discloses a carbon dioxide flooding conveying device which comprises a carbon dioxide storage tank, a conveying pipeline is arranged at an outlet of the carbon dioxide storage tank, a booster pump is arranged at the outlet of the carbon dioxide storage tank, and a spiral flow guide groove is formed in the conveying pipeline. A pressurizing pipe is arranged on the middle section of the conveying pipeline, a turbine synergistic ring is arranged on the middle section of the conveying pipeline, a plurality of pressure balancing mechanisms are arranged on the top of the conveying pipeline, the pressurizing pipe comprises a fixing ring, the inner side of the fixing ring is fixedly connected to the outer side of the conveying pipeline, an inner pipe is arranged on the inner side of the fixing ring, and cambered surface grooves are formed in the two ends of the inner pipe. According to the method, a closed-loop control system of pressurization, synergy and pressure balance is formed, so that the pressure of liquid carbon dioxide in deep sea long-distance transportation is relatively stable, and the oil displacement efficiency and the system stability are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of conveying devices, and in particular to a conveying device for carbon dioxide oil displacement. Background Art

[0002] In CO2-based oil recovery technology, liquid CO2 must be transported to oil reservoirs via long-distance pipelines. This is particularly true in deepwater environments, where complex seabed topography and high-pressure conditions place extremely high demands on the pressure stability of the delivery equipment. During long-distance deepwater transport, issues such as pressure drop along the way, fluid flow turbulence, and external seawater pressure interference directly impact CO2 injection efficiency and oil recovery effectiveness. Therefore, a delivery device that can achieve dynamic pressure balance and efficient pressurization is required.

[0003] Existing CO2 delivery systems typically rely on multi-stage mechanical booster pumps to compensate for pressure drops, directing fluid flow through fixed-section pipes and employing independent pressure-balancing devices to maintain pressure within the pipes. However, multi-stage booster pumps rely on external energy sources, resulting in high equipment investment and maintenance costs. They are also less suitable for use in unpowered deep-sea environments. Furthermore, the pressure-balancing devices and boosting structures are independent of each other, preventing coordinated control and making it difficult to respond to pressure fluctuations in real time. This can easily lead to unstable pressure within the pipes, impacting the overall efficiency of the oil recovery system.

[0004] Therefore, in view of the above problems, a carbon dioxide oil displacement conveying device is proposed to solve the above problems. Summary of the Invention

[0005] In order to make up for the above shortcomings, the present invention provides a carbon dioxide oil recovery conveying device, which aims to improve the problem that most devices in the existing technology rely on external energy for pressurization, and the pressure balancing device and the pressurization device operate independently, resulting in high cost of the device, poor deep-sea applicability and difficulty in real-time response to pressure fluctuations.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A carbon dioxide oil recovery conveying device includes a carbon dioxide storage tank, a transport pipeline provided at the outlet of the carbon dioxide storage tank, a booster pump provided at the outlet of the carbon dioxide storage tank, a spiral guide groove provided inside the transport pipeline, a booster pipe provided in the middle section of the transport pipeline, a turbine efficiency ring provided in the middle section of the transport pipeline, and a plurality of pressure-balancing mechanisms provided on the top of the transport pipeline;

[0008] The boost pipe includes a fixed ring, the inner side of which is fixedly connected to the outer side of the transport pipe, an inner pipe is provided on the inner side of the fixed ring, both ends of the inner pipe are provided with arc grooves, and the radius of the arc grooves gradually decreases from the outside to the inside of the inner pipe, a movable groove is provided inside the inner pipe, a sealing groove is provided inside the inner pipe, a boost channel is provided at the bottom of the inner pipe, and the aperture of the boost channel tends to gradually decrease, and a movable plate is slidably connected to the inside of the movable groove;

[0009] As a further description of the above technical solution:

[0010] A second return spring is installed at the bottom end of the movable groove, and the other end of the second return spring is in contact with the movable plate. A connecting shaft is provided on the outside of the movable plate, and the other end of the connecting shaft is fixedly connected to the piston plate. The inside of the movable groove is fixedly connected to the limit plate, and the outer side of the connecting shaft is slidably connected to the inner side of the limit plate. The top of the movable plate is rotatably connected to the transmission rod, and the other end of the transmission rod is rotatably connected to the boost plug, which is slidably connected to the top of the inner tube.

[0011] As a further description of the above technical solution:

[0012] The piston plate includes a push plate, the outer side of the push plate is connected to the other end of the connecting shaft, the center of the push plate is slidably connected to a sensing plug, one end of the sensing plug is fixedly connected to a linkage plate, the outer side of the linkage plate is rotatably connected to a plurality of connecting rods, the other end of the connecting rod is rotatably connected to an expansion block, one side of the expansion block is slidably connected to the outside of the push plate, a rubber ring is provided on the outer side of the push plate, an annular spring is provided inside the rubber ring, and the far end of the expansion block is slidably connected to the inside of the rubber ring and contacts the far end of the expansion block with the annular spring;

[0013] As a further description of the above technical solution:

[0014] One side of the linkage plate is fixedly connected to a return spring 1, and the other end of the return spring 1 is fixedly connected to the outer side of the push plate;

[0015] As a further description of the above technical solution:

[0016] Sealing plates are fixedly connected to both sides of the movable plate, and the outer sides of the sealing plates are slidably connected to the inside of the sealing groove;

[0017] As a further description of the above technical solution:

[0018] The turbine efficiency ring includes a connecting ring, which is arranged between two sections of the transport pipeline. A mounting ring is provided on the inner side of the connecting ring. Two support frames are fixedly connected to the inner side of the mounting ring. Turbine blades are rotatably connected between the two support frames.

[0019] As a further description of the above technical solution:

[0020] The pressure-balancing mechanism includes a pressure-balancing cylinder, which is fixedly connected to the top of the transport pipeline, a pressure-balancing plug is slidably connected to the inner side of the pressure-balancing cylinder, a movable rod is fixedly connected to the top of the pressure-balancing plug, a plug is fixedly connected to the top of the movable rod, a sealing partition is provided on the outer side of the movable rod, a connecting cover is fixedly connected to the top of the pressure-balancing cylinder, and the outer side of the movable rod is slidably connected to the inner side of the connecting cover;

[0021] As a further description of the above technical solution:

[0022] A plurality of flow holes for the inflow and outflow of seawater are provided inside the connecting cover, and a sealing groove is provided on the top of the connecting cover, and the shape of the sealing groove is adapted to the plug.

[0023] The present invention has the following beneficial effects:

[0024] 1. In the present invention, spiral guide grooves are used to optimize flow patterns and reduce losses along the way. The multi-stage boost pipe converts fluid kinetic energy into pressure energy through the linkage structure of the piston plate and the boost plug. Simultaneously, the rotating blades of the turbine boost ring continuously provide axial thrust to compensate for pipeline pressure drop. The pressure-balancing mechanism automatically adjusts the pipeline volume through real-time balance between seawater pressure and the pressure within the pipeline, forming a closed-loop control system of "boosting-boosting-pressure-balancing." This ensures relatively stable pressure during long-distance deep-sea transportation of liquid CO2, effectively improving oil recovery efficiency and system stability.

[0025] 2. In this invention, a sensor plug senses pressure changes, driving a linkage plate to retract or expand the connecting rod, which in turn controls the expansion block to adjust the diameter of the rubber ring. At low speeds, this increases the flow area, efficiently capturing fluid energy; at high speeds, it automatically reduces the force-bearing area to prevent structural damage from overload. This intelligent adjustment mechanism not only improves energy conversion efficiency but also extends the equipment's lifespan, reduces maintenance costs, and ensures stable operation under complex operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a three-dimensional schematic diagram of a carbon dioxide oil recovery conveying device proposed by the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a transport pipeline of a carbon dioxide oil recovery conveying device proposed in the present invention;

[0028] Figure 3 This is a schematic structural diagram of a booster pipe for a carbon dioxide oil recovery conveying device proposed by the present invention;

[0029] Figure 4 This is a schematic structural diagram of an inner tube of a carbon dioxide oil displacement conveying device proposed by the present invention;

[0030] Figure 5This is a schematic structural diagram of a piston plate of a carbon dioxide oil displacement conveying device proposed in the present invention;

[0031] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0032] Figure 7 This is a schematic structural diagram of a turbine booster ring of a carbon dioxide oil recovery conveying device proposed by the present invention;

[0033] Figure 8 This is a structural schematic diagram of a pressure-balancing mechanism of a carbon dioxide oil displacement conveying device proposed by the present invention.

[0034] Legend:

[0035] 1. CO2 storage tank; 2. Transport pipeline; 3. Spiral guide groove; 4. Booster pipe; 41. Fixed ring; 42. Inner pipe; 421. Arc groove; 422. Movable groove; 423. Sealing groove; 424. Booster channel; 43. Piston plate; 431. Push plate; 432. Rubber ring; 433. Sensor plug; 434. Linkage plate; 435. Return spring 1; 436. Connecting rod; 437. Expansion block; 438. Annular spring ; 439, connecting shaft; 44, limit plate; 45, movable plate; 46, reset spring 2; 47, sealing plate; 48, transmission rod; 49, boost plug; 5, turbine enhancement ring; 501, connecting ring; 502, mounting ring; 503, support frame; 504, turbine blade; 6, pressure balancing mechanism; 601, pressure balancing cylinder; 602, pressure balancing plug; 603, movable rod; 604, sealing partition; 605, plug; 606, connecting cover. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Reference Figures 1 to 8, an embodiment provided by the present invention: a conveying device for carbon dioxide flooding, comprising a carbon dioxide storage tank 1, the carbon dioxide storage tank 1 is used to store liquid carbon dioxide, providing an initial material reserve for the entire conveying process, a transport pipeline 2 is provided at its outlet, and a booster pump is provided at the outlet of the carbon dioxide storage tank 1, the booster pump provides initial conveying power for the liquid carbon dioxide, so that the carbon dioxide can smoothly enter the transport pipeline 2 from the storage tank, a spiral guide groove 3 is provided inside the transport pipeline 2, the spiral guide groove 3 guides the liquid carbon dioxide to flow in an orderly manner in the pipeline, reduces turbulence by forming a spiral flow state, and reduces resistance along the way, a booster pipe 4 is provided in the middle section of the transport pipeline 2, the booster pipe 4 performs pressurization treatment on the liquid carbon dioxide to compensate for the pressure drop in long-distance transportation, a turbine booster ring 5 is provided in the middle section of the transport pipeline 2, the turbine booster ring 5 performs efficiency treatment on the liquid carbon dioxide, and a plurality of pressure balancing mechanisms 6 are provided on the top of the transport pipeline 2, the pressure balancing mechanism 6 balances the pressure in the transport pipeline 2;

[0038] The boost pipe 4 includes a fixed ring 41, the inner side of the fixed ring 41 is fixedly connected to the outer side of the transport pipe 2, and is used to fix the inner pipe 42 and connect it to the transport pipe 2. The inner side of the fixed ring 41 is provided with an inner pipe 42, and the inner pipe 42 constitutes a boost space. The radius of the arc groove 421 opened at both ends gradually decreases from the outside to the inside of the inner pipe 42, guiding the fluid to flow in and achieve initial boosting. The inside of the inner pipe 42 is fixedly connected with a reset spring 2 46, and the reset spring 2 46 provides a reset force for the movable plate 45, which pushes the movable plate 45 to restore the initial position when the fluid impact force decreases. The inside of the inner pipe 42 is slidably connected with a movable plate 45, and the movable plate 45 is connected to the piston plate 43 and transmits motion. When the plate 43 is impacted, it drives itself to slide. A piston plate 43 is provided on the outside of the movable plate 45. The piston plate 43 senses the fluid pressure and adjusts the flow area. The inner tube 42 is fixedly connected to the inner part of the limit plate 44. The limit plate 44 limits the sliding range of the connecting shaft 439 to ensure that the piston plate 43 moves within the set trajectory. The top of the movable plate 45 is rotatably connected to the transmission rod 48. The transmission rod 48 transmits the movement of the movable plate 45 and converts the linear sliding into the up and down sliding of the boost plug 49. The other end of the transmission rod 48 is rotatably connected to the boost plug 49. The boost plug 49 slides downward under the drive of the transmission rod 48, increasing the fluid pressure in the tube. The boost plug 49 is slidably connected to the top of the fixed ring 41.

[0039] The piston plate 43 includes a connecting shaft 439, one end of which is fixedly connected to the outer side of the movable plate 45 and is slidably connected to the inner wall of the limit plate 44, which is used to connect the movable plate 45 and the push plate 431 and ensure the stability of movement. The other end of the connecting shaft 439 is fixedly connected to the push plate 431, which withstands the impact force of the fluid and triggers the flow area adjustment mechanism. The center of the push plate 431 is slidably connected to a sensing plug 433. The sensing plug 433 senses the change in fluid pressure, remains stable at low speed, and is pushed by pressure at high speed. One end of the sensing plug 433 is fixedly connected to a linkage plate 434, which transmits the movement of the sensing plug 433 and controls the extension and retraction of the expansion block 437 through the connecting rod 436. A return spring 435 is fixedly connected to one side of the linkage plate 434. The return spring 435 provides a reset force for the linkage plate 434, maintains the initial state at low speed, and assists the linkage plate 434 to extend outward at high speed. The other end of the return spring 435 is fixedly connected to the outer side of the push plate 431. The outer side of the linkage plate 434 is rotatably connected to a plurality of connecting rods 436, which connect the linkage plate 434 and the expansion block 437 to transmit motion to control the extension and retraction of the expansion block 437. The other end of the connecting rod 436 is rotatably connected to the expansion block 437. The expansion block 437 pushes the rubber ring 432 to expand or contract to adjust the flow area. One side of the expansion block 437 is slidably connected to the outside of the push plate 431. A rubber ring 432 is provided on the outer side of the push plate 431. The rubber ring 432 constitutes the flow-facing surface of the piston plate 43. Under the action of the expansion block 437 and the annular spring 438, the diameter is adjusted according to the flow rate. An annular spring 438 is provided inside the rubber ring 432. The annular spring 438 provides elastic support for the rubber ring 432 and cooperates with the expansion block 437 to achieve uniform expansion or contraction. The far end of the expansion block 437 is slidably connected to the inside of the rubber ring 432 and contacts the far end of the expansion block 437 with the annular spring 438.

[0040] Both ends of the inner tube 42 are provided with arc grooves 421, and the radius of the arc groove 421 gradually decreases from the outside to the inside of the inner tube 42, guiding the fluid to flow into the inner tube 42 and achieving initial pressurization through the tapered structure. A movable groove 422 is provided inside the inner tube 42 to provide sliding space for the movable plate 45. A sealing groove 423 is provided inside the inner tube 42, and sealing plates 47 are fixedly connected on both sides of the movable plate 45. The outer side of the sealing plate 47 is slidably connected to the inside of the sealing groove 423 to ensure the sealing of the inner tube 42 and prevent fluid leakage. A pressurization channel 424 is provided at the bottom of the inner tube 42, and the aperture of the pressurization channel 424 tends to gradually decrease, so as to synergistically pressurize the liquid carbon dioxide and further increase the fluid pressure.

[0041] The turbine enhancement ring 5 includes a connecting ring 501, which is arranged between two sections of the transport pipeline 2 and is used to fix the turbine blades 504 and connect the two sections of the pipeline. A mounting ring 502 is provided on the inner side of the connecting ring 501, and two support frames 503 are fixedly connected to the inner side of the mounting ring 502. The support frames 503 support the turbine blades 504 so that they can rotate freely between the two sections of the support frames 503. The turbine blades 504 are rotatably connected between the two support frames 503. The turbine blades 504 are evenly distributed along the circumference and adopt a "forward swept + backward bent" composite shape to reduce fluid impact loss. When the turbine blades 504 are rotated by the fluid impact, the kinetic energy will be converted into axial thrust to compensate for the pressure drop along the pipeline.

[0042] The pressure-balancing mechanism 6 includes a pressure-balancing cylinder 601, which is fixedly connected to the top of the transport pipeline 2, accommodates a pressure-balancing plug 602 and provides a sliding space. The inner side of the pressure-balancing cylinder 601 is slidably connected to the pressure-balancing plug 602, which senses the pressure change in the pipeline and drives the movable rod 603 to move. The top of the pressure-balancing plug 602 is fixedly connected to the movable rod 603, which transmits the movement of the pressure-balancing plug 602 and controls the plug 605 to open and close the flow hole. The top of the movable rod 603 is fixedly connected to the plug 60 5. The plug 605 controls the inflow and outflow of seawater and adjusts the inflow or discharge volume according to the pressure change. A sealing partition 604 is provided on the outside of the movable rod 603 to ensure the sealing of the equal pressure cylinder 601 and prevent the seawater from contacting the fluid in the pipe. The top of the equal pressure cylinder 601 is fixedly connected with a connecting cover 606, and the outer side of the movable rod 603 is slidably connected to the inner side of the connecting cover 606. The connecting cover 606 connects the seawater and the equal pressure cylinder 601. The internal flow hole allows seawater to enter and exit, thereby achieving a dynamic balance between the pressure inside the pipeline and the external seawater pressure.

[0043] Working Principle: Carbon dioxide flows out of the outlet of the carbon dioxide storage tank 1. The booster pump at the outlet provides power for initial delivery, allowing the carbon dioxide to enter the transport pipeline 2. Spiral guide grooves 3 within the transport pipeline 2 guide the orderly flow of carbon dioxide within the pipeline. When the carbon dioxide flows into the booster pipe 4, the radius of the curved grooves 421 at both ends of the inner tube 42, which are located inside the fixing ring 41, gradually decreases from the outside to the inside of the inner tube 42, thereby achieving an initial boost effect and guiding the carbon dioxide into the inner tube 42.

[0044] When carbon dioxide impacts the push plate 431 of the piston plate 43, the pressure change is sensed by the sensor plug 433, which is slidably connected to the center of the push plate 431. When the carbon dioxide liquid is at a low speed, the fluid impacts the push plate 431, and the sensor plug 433 remains relatively stable, causing the return spring 1 435 to be in a natural state. At this time, because the linkage plate 434 is in its initial state, the connecting rod 436 is initially open, and the expansion block 437 expands the annular spring 438, and the rubber ring 432 now has its maximum diameter, thereby increasing the flow area of ​​the piston plate 43 and increasing the capture of water energy. When the carbon dioxide liquid is at a high speed, the fluid pressure pushes the sensor plug 433 to stretch the return spring 1 435, and the linkage plate 434 extends outward, causing the connecting rod 436 to contract. This causes the expansion block 437 to contract inward, which in turn causes the annular spring 438 to contract, and finally the rubber ring 432 to contract as a whole, thereby reducing the force-bearing area of ​​the piston plate 43 and preventing damage to the structure due to excessive impact force.

[0045] Under the impact force of carbon dioxide, the movement of the piston plate 43 drives the movable plate 45 to slide through the connecting shaft 439, thereby compressing the return spring 46 inside the inner tube 42. The transmission rod 48 connected to the top of the movable plate 45 rotates accordingly, driving the boost plug 49 to slide downward on the top of the fixed ring 41, increasing the pressure on the liquid carbon dioxide, and synergistically boosting the carbon dioxide through the boost channel 424 opened at the bottom of the inner tube 42.

[0046] The pressurized carbon dioxide continues to flow in the transport pipeline 2 and reaches the turbine enhancement ring 5. The mounting ring 502 on the inner side of the connecting ring 501 rotates through the support frame 503, and the turbine blades 504 connected thereto rotate under the impact of the carbon dioxide, thereby further enhancing the efficiency of the carbon dioxide.

[0047] During the entire transportation process, the pressure-balancing mechanism 6 on the top of the transport pipeline 2 works in real time. The pressure-balancing plug 602 slidingly connected to the inside of the pressure-balancing cylinder 601 moves as the pressure in the pipeline changes. The movable rod 603 fixedly connected to the top of the pressure-balancing plug 602 drives the plug 605 to move, thereby opening the flow holes on the connecting cover 606. Since multiple flow holes opened inside the connecting cover 606 allow seawater to enter and exit, when the pressure changes, the movement of the pressure-balancing plug 602 and the amount of seawater entering and exiting keep the internal pressure of the transport pipeline 2 within a certain range, thereby ensuring the stability of the entire transportation process.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A carbon dioxide oil displacement conveying device, comprising a carbon dioxide storage tank (1), characterized in that: The outlet of the carbon dioxide storage tank (1) is provided with a transport pipeline (2), and the outlet of the carbon dioxide storage tank (1) is provided with a booster pump, a spiral guide groove (3) is provided inside the transport pipeline (2), a booster pipe (4) is provided in the middle section of the transport pipeline (2), a turbine booster ring (5) is provided in the middle section of the transport pipeline (2), and a plurality of pressure-balancing mechanisms (6) are provided at the top of the transport pipeline (2); The boost pipe (4) includes a fixed ring (41), the inner side of the fixed ring (41) is fixedly connected to the outer side of the transport pipe (2), an inner pipe (42) is provided on the inner side of the fixed ring (41), both ends of the inner pipe (42) are provided with arc grooves (421), and the radius of the arc groove (421) gradually decreases from the outside to the inside of the inner pipe (42), a movable groove (422) is provided inside the inner pipe (42), a sealing groove (423) is provided inside the inner pipe (42), a boost channel (424) is provided at the bottom of the inner pipe (42), and the aperture of the boost channel (424) tends to gradually decrease, and a movable plate (45) is slidably connected inside the movable groove (422).

2. A carbon dioxide displacement conveying device according to claim 1, characterized in that: A second return spring (46) is installed at the bottom end of the movable groove (422), and the other end of the second return spring (46) contacts the movable plate (45). A connecting shaft (439) is provided on the outside of the movable plate (45), and the other end of the connecting shaft (439) is fixedly connected to the piston plate (43). The inside of the movable groove (422) is fixedly connected to the limit plate (44), and the outside of the connecting shaft (439) is slidably connected to the inside of the limit plate (44). The top of the movable plate (45) is rotatably connected to the transmission rod (48), and the other end of the transmission rod (48) is rotatably connected to the boost plug (49), and the boost plug (49) is slidably connected to the top of the inner tube (42).

3. A carbon dioxide displacement conveying device according to claim 2, characterized in that: The piston plate (43) includes a push plate (431), the outer side of the push plate (431) is connected to the other end of the connecting shaft (439), the center of the push plate (431) is slidably connected to a sensing plug (433), one end of the sensing plug (433) is fixedly connected to a linkage plate (434), the outer side of the linkage plate (434) is rotatably connected to a plurality of connecting rods (436), the other end of the connecting rod (436) is rotatably connected to an expansion block (437), one side of the expansion block (437) is slidably connected to the outside of the push plate (431), a rubber ring (432) is provided on the outer side of the push plate (431), an annular spring (438) is provided inside the rubber ring (432), and the far end of the expansion block (437) is slidably connected to the inside of the rubber ring (432) and contacts the far end of the expansion block (437) and the annular spring (438).

4. A carbon dioxide displacement conveying device according to claim 3, characterized in that: One side of the linkage plate (434) is fixedly connected to a return spring (435), and the other end of the return spring (435) is fixedly connected to the outer side of the push plate (431).

5. A carbon dioxide displacement conveying device according to claim 1, characterized in that: Sealing plates (47) are fixedly connected to both sides of the movable plate (45), and the outer sides of the sealing plates (47) are slidably connected to the inside of the sealing groove (423).

6. A carbon dioxide displacement conveying device according to claim 1, characterized in that: The turbine enhancement ring (5) comprises a connecting ring (501), the connecting ring (501) being arranged between two sections of transport pipelines (2), a mounting ring (502) being arranged on the inner side of the connecting ring (501), two supporting frames (503) being fixedly connected to the inner side of the mounting ring (502), and a turbine blade (504) being rotatably connected between the two supporting frames (503).

7. A carbon dioxide displacement conveying device according to claim 1, characterized in that: The pressure-balancing mechanism (6) comprises a pressure-balancing cylinder (601), which is fixedly connected to the top of the transport pipeline (2); a pressure-balancing plug (602) is slidably connected to the inner side of the pressure-balancing cylinder (601); a movable rod (603) is fixedly connected to the top of the pressure-balancing plug (602); a plug (605) is fixedly connected to the top of the movable rod (603); a sealing partition (604) is provided on the outer side of the movable rod (603); a connecting cover (606) is fixedly connected to the top of the pressure-balancing cylinder (601), and the outer side of the movable rod (603) is slidably connected to the inner side of the connecting cover (606).

8. A carbon dioxide displacement conveying device according to claim 7, characterized in that: The interior of the connecting cover (606) is provided with a plurality of flow holes for the inflow and outflow of seawater. The top of the connecting cover (606) is provided with a sealing groove, and the shape of the sealing groove is adapted to the plug (605).

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