Liquid carbon dioxide tank for CCUS carbon sequestration

Abstract

The utility model relates to a CCUS carbon sequestration technology, and aims at solving the technical problems that an existing CCUS carbon sequestration container cannot store liquid carbon dioxide and cannot be connected with fracturing equipment in a matched mode, the pipeline pressure is low, and the flow speed is low. The liquid carbon dioxide tank for CCUS carbon sequestration comprises a liquid carbon dioxide loading and unloading pipeline arranged on the outer side wall of one end of a tank body. The liquid carbon dioxide loading and unloading pipeline comprises an emptying pipeline, a liquid outlet pipeline, a gas phase pipeline, a liquid inlet pipeline and a pressure relief pipeline; the emptying pipeline is used for releasing pressure in each pipeline, and the outlet end of the emptying pipeline extends outwards towards the top of the tank body; a pressure regulating pipeline communicated with the liquid outlet pipeline is arranged on the gas phase pipeline; the gas phase pipeline is also connected with at least one group of pressure release valves; a bypass pipeline connector is arranged in the middle of the pressure relief pipeline and used for being communicated with a pressure relief valve on a gas phase pipeline. And the liquid level monitoring pipeline is used for measuring pressure and liquid level information of a medium in the tank body.

Description

Technical Field

[0001] This utility model relates to CCUS carbon sequestration technology, specifically to a liquid carbon dioxide tank for CCUS carbon sequestration. Background Technology

[0002] With the rise of green and low-carbon industries, carbon capture, utilization and storage (CCUS) has been increasingly promoted and applied in the petrochemical industry in recent years as an important carbon emission reduction measure. Liquid carbon dioxide tank containers used in CCUS carbon sequestration are key equipment in the carbon sequestration process, making research on liquid carbon dioxide tank containers for CCUS carbon sequestration imperative.

[0003] For liquid carbon dioxide tank containers used in CCUS carbon sequestration, the tank containers must comply with the technical regulations for mobile pressure vessels and tank containers, be able to meet the short-term storage requirements of liquid carbon dioxide, meet the various functional requirements of CCUS fracturing process, and ensure the safety and reliability of equipment operation.

[0004] However, the existing CCUS carbon sequestration liquid carbon dioxide tank containers are only used for transporting liquid carbon dioxide and do not have the function of storing liquid carbon dioxide or being used in conjunction with fracturing equipment. As a result, the tank container is designed with a low pressure of only 2.2 MPa, and the pipeline pressure is low and the flow rate is slow, which cannot meet the user's needs. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of existing CCUS carbon sequestration liquid carbon dioxide tank containers that cannot be connected with fracturing equipment, and that have low pipeline pressure and slow flow rate, and to propose a liquid carbon dioxide tank for CCUS carbon sequestration.

[0006] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0007] A liquid carbon dioxide tank for CCUS carbon sequestration includes a tank body. The top of the rear end of the tank body is provided with a liquid inlet, a gas phase inlet and a liquid level inlet, and the bottom is provided with a liquid discharge inlet and a sewage outlet. The special feature is that a liquid carbon dioxide loading and unloading pipeline is provided on the outer side wall of one end of the tank body.

[0008] The liquid carbon dioxide loading and unloading pipeline includes a venting pipeline with its inlet end located at the bottom of the outer wall of the rear end of the tank body, a liquid outlet pipeline, a gas phase pipeline, a liquid inlet pipeline, and a pressure relief pipeline located above the inlet end of the venting pipeline and arranged from bottom to top on the outer wall of the tank body; the venting pipeline is used to release the pressure in each pipeline, and the outlet end of the venting pipeline is located at the top of the tank body and extends outward; the inlet end of the venting pipeline is connected to the liquid outlet pipeline, the gas phase pipeline, the liquid inlet pipeline, and the gas phase inlet pipeline respectively through valve connecting pipes;

[0009] One end of the liquid outlet pipeline is connected to the liquid discharge port, and the other end is provided with a liquid outlet; one end of the liquid inlet pipeline is provided with a first interface adapted to the external storage tank, and the other end is connected to the liquid inlet port;

[0010] The outlet end of the gas phase pipeline is provided with a second interface adapted to the external storage tank, and the inlet end is connected to the gas phase pipeline port. The gas phase pipeline is provided with a pressure regulating pipeline connected to the liquid outlet pipeline for supplementing the pressure of the liquid outlet pipeline. At least one set of pressure relief valves is also connected to the gas phase pipeline for releasing the internal pressure of the tank.

[0011] One end of the pressure relief pipeline is connected to the gas phase port, and the other end is connected to the vent pipeline. A bypass pipeline interface is provided in the middle of the pressure relief pipeline for connecting to the pressure relief valve on the gas phase pipeline.

[0012] Valve assemblies are installed between each interconnected pipe opening and pipe, and between pipes themselves;

[0013] One end of the liquid level monitoring pipeline is connected to the upper liquid level port, and the other end is connected to the drain port, used to measure the pressure and liquid level information of the medium inside the tank.

[0014] Furthermore, an anti-clogging pipe is provided at the outlet end of the venting pipeline;

[0015] The anti-clogging pipeline includes a horizontal pipe, a U-shaped pipe, and a vertical pipe connected in sequence to the outlet end of the venting pipeline. The open end of the U-shaped pipe faces upward to prevent liquid or impurities from flowing back into the anti-clogging pipeline.

[0016] Furthermore, a venting master control valve is also installed on the venting pipeline to control the pressure discharge of the venting pipeline.

[0017] Furthermore, the valve assembly on the liquid outlet pipeline includes an electrically controlled valve and a manually controlled valve. The electrically controlled valve is used for remote control by the operator, and the manually controlled valve is used for manual control of the opening and closing of the liquid outlet pipeline.

[0018] A safety valve is installed between the electrically controlled valve and the manually controlled valve to prevent the medium in the pipeline between the two sets of valves from damaging the valves and to ensure the safety of the tank.

[0019] Furthermore, the diameter of the outlet on the liquid outlet pipeline is adapted to the diameter of the external interface pipeline.

[0020] Furthermore, the pressure relief valve is a ball valve or a shut-off valve, with its two ends connected to the gas phase pipeline and the pressure relief pipeline respectively through conduits, for releasing the internal pressure of the tank.

[0021] Furthermore, the liquid level monitoring pipeline includes a liquid level pressure measurement pipeline and a liquid level gauge;

[0022] The liquid level and pressure measurement pipeline includes a differential pressure level gauge and a shut-off valve installed on the outer wall of the tank body. The differential pressure level gauge has two pressure measuring connection pipes at its acquisition end, which are respectively connected to the upper liquid level pipe port and the drain pipe port for measuring pressure changes inside the tank. The shut-off valve is installed at the acquisition end of the differential pressure level gauge for controlling the connection or disconnection between the differential pressure level gauge and the inside of the tank.

[0023] The two ends of the level gauge are respectively fixed at a high and low radial position on the outer wall of the tank body. The two ends are respectively connected to the upper level pipe and the drain pipe through level connecting pipes. It is used to measure the liquid level information inside the tank body, and its range is not less than 4 / 5 of the inner diameter of the tank body.

[0024] Furthermore, the liquid level and pressure measuring pipeline is also equipped with a pressure bypass pipeline, and a pressure transmitter is installed on the pressure bypass pipeline for transmitting the internal pressure information of the tank to an external data receiving device.

[0025] Furthermore, the level gauge is equipped with a level transmitter for transmitting the internal liquid level information of the tank to an external data receiving device.

[0026] Furthermore, the level gauge is a magnetic float level gauge.

[0027] The beneficial effects of this utility model are:

[0028] [1] The liquid carbon dioxide tank of this utility model for CCUS carbon sequestration can not only realize the transportation and short-term storage of liquid carbon dioxide medium, but also meet the pressure in the CCUS fracturing process, ensuring the production safety of users and effectively improving the pressure bearing capacity and safety performance of the tank.

[0029] [2] This utility model can effectively ensure the safety performance of CCUS fracturing process by setting a liquid outlet pipeline at the bottom of the tank and setting an electric control valve on the liquid outlet pipeline. It can remotely control the loading and unloading pipeline, improve the liquid discharge efficiency, effectively reduce the on-site work intensity and safety risks, reduce the labor intensity of operators, ensure the life safety and property safety of operators, improve work efficiency, and save liquid discharge time and human resources.

[0030] [3] By setting multiple valves and a main venting control valve on the venting pipeline, this utility model can effectively release the pressure of the liquid outlet pipeline, liquid inlet pipeline, gas phase pipeline and pipeline inside the tank. It also facilitates the disassembly and maintenance of each pipeline by the operator. It can also be used to discharge residual liquid after the medium inside the tank is unloaded. This effectively improves the safety and operability of the tank, facilitates later maintenance, extends the service life of the loading and unloading pipeline, and saves production and maintenance costs.

[0031] [4] By setting an anti-blocking pipe at the outlet end of the venting pipe, this utility model can effectively prevent liquid or impurities from flowing back into the blockage pipe, ensuring the pressure relief performance of the venting pipe, avoiding poor pressure release caused by blockage of the tank or loading and unloading pipe, and greatly improving the safety and reliability of the loading and unloading pipe.

[0032] [5] The present invention arranges the venting pipeline and the liquid outlet pipeline at the bottom of the outer wall of the tank body, which can not only ensure that the pressure in each pipeline is effectively released, but also avoid the leakage of media in other pipelines during the liquid discharge process. It effectively improves the pressure relief performance of the venting pipeline, as well as the liquid discharge efficiency and liquid discharge rate of the liquid outlet pipeline, and improves the practicality of the loading and unloading pipeline.

[0033] [6] This utility model sets up a pressure regulating pipeline between the gas phase pipeline and the liquid outlet pipeline, which can effectively supplement the pressure of the liquid outlet pipeline, and avoid the excessive pressure gradient reduction when the liquid carbon dioxide medium is discharged from the liquid outlet pipeline in the initial stage of unloading, which will sublimate into dry ice, causing pipeline blockage and affecting the normal use of the loading and unloading pipeline, thus effectively improving the safety performance of the loading and unloading pipeline. Attached Figure Description

[0034] Figure 1 This is a schematic diagram showing the connection between the tank body and the liquid carbon dioxide loading and unloading pipeline in an embodiment of the liquid carbon dioxide tank for CCUS carbon sequestration of this utility model.

[0035] Figure 2 This is a schematic diagram of the liquid carbon dioxide loading and unloading pipeline in an embodiment of this utility model;

[0036] Figure 3 This is a schematic diagram of the anti-clogging pipe structure in an embodiment of this utility model;

[0037] Figure label:

[0038] 1-Tank body, 2-Vent pipe, 3-Liquid outlet pipe, 4-Gas phase pipe, 5-Liquid inlet pipe, 6-Pressure relief pipe, 7-Liquid level and pressure measuring pipe, 8-Liquid level gauge, 9-Valve connecting pipe, 10-Liquid outlet, 11-First interface, 12-Liquid inlet, 13-Second interface, 14-Pressure regulating pipe, 15-Pressure relief valve, 16-Anti-clogging pipe, 17-Horizontal through pipe, 18-U-shaped through pipe, 19-Vertical through pipe, 20-Vent main control valve, 21-Electrically controlled valve, 22-Manually controlled valve, 23-Gas phase port, 24-Upper liquid level port, 25-Unloading port, 26-Sewage discharge port. Detailed Implementation

[0039] A liquid carbon dioxide tank for CCUS carbon sequestration includes a tank body 1, such as Figure 1 As shown, the top of the rear end of the tank body 1 is provided with a liquid inlet 12, a gas phase inlet 23 and an upper liquid level inlet 24, and the bottom is provided with a liquid discharge inlet 25 and a sewage outlet 26; a liquid carbon dioxide loading and unloading pipeline is provided on the outer wall of one end of the tank body 1.

[0040] like Figure 2 As shown, the liquid carbon dioxide loading and unloading pipeline includes a venting pipe 2 with its inlet end located at the bottom of the outer wall of the rear end of the tank body 1, a liquid outlet pipe 3 located above the inlet end of the venting pipe 2 and arranged from bottom to top on the outer wall of the rear end of the tank body 1, a gas phase pipe 4, a liquid inlet pipe 5, a pressure relief pipe 6, a liquid level and pressure measuring pipe 7, and a liquid level gauge 8 arranged radially between the high and low positions on the outer wall of the tank body 1.

[0041] The inlet end of the venting pipeline 2 is connected to the liquid outlet pipeline 3, the gas phase pipeline 4, the liquid inlet pipeline 5, and the gas phase port 23 via valve connecting pipes 9. A venting master control valve 20 is installed on the venting pipeline 2 near the valve connecting pipe 9 that communicates with the inside of the tank. Each valve connecting pipe 9 is used to control the release of pressure in each pipeline by the venting pipeline 2. The installation of each valve connecting pipe 9 and the venting master control valve 20 can facilitate the disassembly of each pipeline by construction personnel and ensure the safety of the disassembly operation. At the same time, the venting pipeline 2 can also be used to discharge residual liquid after the medium inside the tank is unloaded.

[0042] The outlet end of the vent pipe 2 is located at the top of the tank and extends outward, with an anti-clogging pipe 16 installed at its outlet end; such as Figure 3As shown, the anti-clogging pipe 16 includes a horizontal pipe 17, a U-shaped pipe 18, and a vertical pipe 19 connected in sequence to the outlet end of the vent pipe 2. The open end of the U-shaped pipe 18 faces upward. The horizontal pipe 17 and the vertical pipe 19 are respectively connected to the two open ends of the U-shaped pipe 18, which are used for the return of liquid or impurities to the loading and unloading pipeline. This ensures the pressure relief performance of the vent pipe 2 and effectively avoids the accumulation of rain, snow, or other impurities, which could cause ice blockage inside the loading and unloading pipeline. This also avoids safety accidents caused by poor pressure release of the tank or loading and unloading pipeline.

[0043] One end of the liquid outlet pipe 3 is connected to the unloading port 25, and the other end is provided with an outlet 10. An electrically controlled valve 21 is installed on the liquid outlet pipe 3 near the outlet 10 for remote control by the operator, which can effectively improve the unloading speed and efficiency. A manually controlled valve 22 is installed on the liquid outlet pipe 3 near the unloading port 25 for manual control of the opening and closing of the liquid outlet pipe 3 to ensure operational safety. The manually controlled valve 22 and the electrically controlled regulating valve 21 work together to allow the operator to remotely control the opening and closing of the pipe or the flow rate. When the electrically controlled regulating valve 21 needs to be offline for maintenance or when the seal is faulty, the manually controlled valve 22 can be used to control the opening and closing of the liquid outlet pipe 3 separately to ensure operational safety.

[0044] The pipeline between the outlet pipeline 3 and the tank body 1 can prevent the outlet pipeline 3 from frosting or even freezing on its outer wall due to excessively low temperature when there is low temperature medium in the tank, which would affect valve operation. This structure can not only effectively ensure the discharge rate and efficiency of the outlet pipeline 3, but also ensure the rationality of the arrangement of other pipelines in the loading and unloading pipeline. It ensures that the gas phase pipeline 4, the liquid inlet pipeline 5, the pressure relief pipeline 6 and the liquid level monitoring pipeline are arranged above the outlet pipeline 3, avoiding medium leakage at the connection surface between other pipelines and the outer wall of the tank body 1 during the discharge process.

[0045] One end of the liquid inlet pipeline 5 is provided with a first interface 11 adapted to an external liquid carbon dioxide tanker or a fixed storage tank, and the other end is connected to the liquid inlet 12 provided on the top of the tank body for introducing a medium into the tank body.

[0046] The outlet end of the gas phase pipeline 4 is equipped with a second interface 13 adapted to external liquid carbon dioxide tank trucks or fixed storage tanks, and the inlet end is connected to the gas phase port 23 set on the top of the tank. The gas phase pipeline 4 near the second interface 13 is equipped with a pressure regulating pipeline 14 connected to the liquid outlet pipeline 3, which is used to supplement the pressure of the liquid outlet pipeline 3 to prevent the pressure gradient from decreasing too much when the liquid carbon dioxide medium is discharged from the liquid outlet pipeline 3 in the initial stage of unloading, which may lead to sublimation into dry ice, causing pipeline blockage and affecting the normal use of the loading and unloading pipeline. The gas phase pipeline 4 located above the pressure regulating pipeline 14 is also connected to at least one set of pressure relief valves 15, which are used to release pressure when the internal pressure of the tank rises abnormally due to factors such as fire in an emergency, to protect the safety of the tank and the operators. The gas phase pipeline 4 is used to balance the gas phase pressure between the tank and external facilities, and to pressurize the tank internally.

[0047] The pressure relief valve 15 is a ball valve or a shut-off valve. Its outlet end is connected to the gas phase pipeline 4 and the pressure relief pipeline 6 through a metal hose, respectively, to release the medium pressure in each pipeline. One end of the pressure relief pipeline 6 is connected to the gas phase port 23, and the other end is connected to the vent pipeline 2. A bypass pipeline interface is provided in the middle of the pressure relief pipeline 6 to connect with the pressure relief valve 15 on the gas phase pipeline 4. The pressure relief pipeline 6 is used to actively release the pressure inside the tank and in the gas phase pipeline 4.

[0048] Each interconnected pipe opening and pipe, and between pipes, is equipped with a valve assembly; the valve assembly on the liquid outlet pipe 3 includes an electrically controlled valve 21 and a manually controlled valve 22. The electrically controlled valve 21 is used for remote control by the operator, and the manually controlled valve 22 is used for manual control of the opening and closing of the liquid outlet pipe 3.

[0049] A safety valve is installed between the electrically controlled valve 21 and the manually controlled valve 22 to prevent the medium in the pipeline between the two sets of valves from damaging the valves and to ensure the safety of the tank.

[0050] The liquid level monitoring pipeline includes a liquid level pressure measurement pipeline 7 and a liquid level gauge 8. The liquid level pressure measurement pipeline 7 includes a differential pressure liquid level gauge and a shut-off valve installed on the outer wall of the tank body 1. The differential pressure liquid level gauge has two pressure measuring connection pipes at its acquisition end, which are respectively connected to the upper liquid level port 24 and the drain port 26 for measuring the pressure change inside the tank. The shut-off valve is installed at the acquisition end of the differential pressure liquid level gauge for controlling the connection or disconnection between the differential pressure liquid level gauge and the inside of the tank. The liquid level pressure measurement pipeline 7 is also equipped with a pressure bypass pipeline, on which a pressure transmitter is installed for transmitting the internal pressure information of the tank to an external data receiving device.

[0051] The level gauge 8 is a magnetic float level gauge, with its two ends fixed to the radial high and low positions on the outer wall of the tank body 1, respectively. Its two ends are connected to the upper level pipe port 24 and the drain pipe port 26 through level connecting pipes, respectively, and are used to observe the liquid level information inside the tank. Its range is not less than 4 / 5 of the inner diameter of the tank body 1. The level gauge 8 is equipped with a level transmitter, which is used to transmit the liquid level information inside the tank to an external data receiving device.

Claims

1. A liquid carbon dioxide tank for CCUS carbon sequestration, comprising a tank body (1), wherein the top of the rear end of the tank body (1) is provided with a liquid inlet (12), a gas phase inlet (23) and a liquid level inlet (24), and the bottom is provided with a liquid discharge inlet (25) and a sewage outlet (26), characterized in that: A liquid carbon dioxide loading and unloading pipeline is provided on the outer wall of one end of the tank body (1); The liquid carbon dioxide loading and unloading pipeline includes a venting pipeline (2) with its inlet end located at the bottom of the outer wall of the rear end of the tank body (1), a liquid outlet pipeline (3), a gas phase pipeline (4), a liquid inlet pipeline (5) located above the inlet end of the venting pipeline (2) and arranged from bottom to top on the outer wall of the rear end of the tank body (1), and a pressure relief pipeline (6). The outlet end of the venting pipeline (2) is located at the top of the tank body and extends outward. The inlet end of the venting pipeline (2) is connected to the liquid outlet pipeline (3), the gas phase pipeline (4), the liquid inlet pipeline (5), and the gas phase port (23) respectively through a valve connecting pipe (9). One end of the liquid outlet pipe (3) is connected to the liquid discharge port (25), and the other end is provided with a liquid outlet (10); one end of the liquid inlet pipe (5) is provided with a first interface (11) adapted to the external storage tank, and the other end is connected to the liquid inlet port (12); The outlet end of the gas phase pipeline (4) is provided with a second interface (13) adapted to the external storage tank, and the inlet end is connected to the gas phase pipeline port (23). The gas phase pipeline (4) is provided with a pressure regulating pipeline (14) connected to the liquid outlet pipeline (3) for supplementing the pressure of the liquid outlet pipeline (3). At least one set of pressure relief valves (15) is also connected to the gas phase pipeline (4) for releasing the internal pressure of the tank. One end of the pressure relief pipeline (6) is connected to the gas phase port (23), and the other end is connected to the vent pipeline (2). A bypass pipeline interface is provided in the middle of the pressure relief pipeline (6) for connecting to the pressure relief valve (15) on the gas phase pipeline (4). Valve assemblies are installed between each interconnected pipe opening and pipe, and between pipes themselves; One end of the liquid level monitoring pipeline is connected to the upper liquid level port (24), and the other end is connected to the drain port (26), which is used to measure the pressure and liquid level information of the medium in the tank.

2. The liquid carbon dioxide tank for CCUS carbon sequestration according to claim 1, characterized in that: An anti-blocking pipe (16) is provided at the outlet end of the venting pipe (2); The anti-blocking pipe (16) includes a horizontal pipe (17), a U-shaped pipe (18) and a vertical pipe (19) connected in sequence to the outlet end of the vent pipe (2). The open end of the U-shaped pipe (18) faces upward to prevent liquid or impurities from flowing back into the anti-blocking pipe (16).

3. A liquid carbon dioxide tank for CCUS carbon sequestration according to claim 2, characterized in that: The venting pipeline (2) is also equipped with a venting master control valve (20) for controlling the pressure discharge of the venting pipeline (2).

4. A liquid carbon dioxide tank for CCUS carbon sequestration according to claim 3, characterized in that: The valve assembly on the outlet pipeline (3) includes an electrically controlled valve (21) and a manually controlled valve (22). The electrically controlled valve (21) is used for remote control by the operator, and the manually controlled valve (22) is used for manual control of the opening and closing of the outlet pipeline (3). A safety valve is provided between the electrically controlled valve (21) and the manually controlled valve (22) to prevent the medium in the pipeline between the two sets of valves from damaging the valves and to ensure the safety of the tank.

5. A liquid carbon dioxide tank for CCUS carbon sequestration according to claim 4, characterized in that: The diameter of the outlet (10) on the outlet pipe (3) is compatible with the diameter of the external interface pipe.

6. A liquid carbon dioxide tank for CCUS carbon sequestration according to claim 5, characterized in that: The pressure relief valve (15) is a ball valve or a shut-off valve, and its two ends are connected to the gas phase pipeline (4) and the pressure relief pipeline (6) respectively through conduits, and is used to release the internal pressure of the tank.

7. A liquid carbon dioxide tank for CCUS carbon sequestration according to any one of claims 1-6, characterized in that: The liquid level monitoring pipeline includes a liquid level and pressure measurement pipeline (7) and a liquid level gauge (8); The liquid level pressure measurement pipeline (7) includes a differential pressure level gauge and a shut-off valve installed on the outer wall of the tank body (1). The differential pressure level gauge has two pressure measuring connection pipes at its acquisition end. The two pressure measuring connection pipes are respectively connected to the upper liquid level pipe port (24) and the drain pipe port (26) for measuring the pressure change inside the tank. The shut-off valve is installed at the acquisition end of the differential pressure level gauge for controlling the connection or disconnection between the differential pressure level gauge and the inside of the tank. The two ends of the level gauge (8) are respectively fixed on the radial high and low positions on the outer side wall of the tank body (1). The two ends are respectively connected to the upper level pipe port (24) and the drain pipe port (26) through the level connection pipe. It is used to measure the level information inside the tank body. Its range is not less than 4 / 5 of the inner diameter of the tank body (1).

8. A liquid carbon dioxide tank for CCUS carbon sequestration according to claim 7, characterized in that: The liquid level and pressure measuring pipeline (7) is also equipped with a pressure bypass pipeline, and a pressure transmitter is installed on the pressure bypass pipeline to transmit the internal pressure information of the tank to an external data receiving device.

9. A liquid carbon dioxide tank for CCUS carbon sequestration according to claim 8, characterized in that: The level gauge (8) is equipped with a level transmitter for transmitting the liquid level information inside the tank to an external data receiving device.

10. A liquid carbon dioxide tank for CCUS carbon sequestration according to claim 9, characterized in that: The level gauge (8) is a magnetic float level gauge.

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