Accurately-controlled supercritical CO2 injection device

Abstract

The utility model discloses an accurately-controlled supercritical CO2 injection device, and relates to the technical field of supercritical CO2 injection equipment. The device comprises a base, the top of the base is fixedly connected with a pump shell, the interior of the pump shell is rotationally connected with a rotor, the interior of the pump shell is provided with a heat exchange bin, the heat exchange bin wraps the periphery of the rotor, the top of the heat exchange bin is provided with a pump groove, the interior of the pump groove is rotationally connected with an impeller, and one end of the pump groove is fixedly connected with a first circulating pipe. According to data such as the temperature, the pressure and the flow when supercritical CO2 penetrates through the pump shell to be extruded out, the output power of the driving mechanism is automatically adjusted, so that when the rotor pushes the supercritical CO2 to penetrate through the interior of the pump shell, the heat exchange medium is heated to the proper temperature through the compressor interstage temperature controller, and the heat exchange efficiency is improved. And the heat exchange medium is guided to circularly flow between the heat exchange bin and the compressor interstage temperature controller, so that heat exchange and temperature regulation are carried out through the pump shell and supercritical CO2 penetrating through the interior of the pump shell, and the supercritical state of CO2 is maintained.

Description

Technical Field

[0001] This application relates to the field of supercritical CO2 injection equipment technology, and in particular to a precisely controlled supercritical CO2 injection device. Background Technology

[0002] In industries such as chemical engineering, oil extraction, and food processing, supercritical CO2 is widely used as an excellent solvent in various extraction and reaction processes. Because the phase behavior of CO2 (i.e., whether it is in the gas phase, liquid phase, or supercritical state) is affected by temperature and pressure, precise control of its temperature and pressure is required to ensure that CO2 is injected in a supercritical state, keeping them above the critical point (7.38 MPa and 31.4 °C). Due to its unique physicochemical properties, such as zero surface tension, low viscosity, and high diffusivity, supercritical CO2 technology is used in fields such as enhanced oil recovery, food processing, and materials preparation.

[0003] Currently, supercritical CO2 injection technology has made some progress. For example, supercritical CO2 Brayton cycle power generation systems use CO2 to replace water as the working medium, achieving high power generation efficiency. In the oil extraction field, supercritical CO2 is used in fracturing technology to improve the extraction efficiency of shale gas.

[0004] However, traditional supercritical injection devices typically employ simple pressure and temperature control methods, which cannot effectively control the temperature of CO2 under extreme temperature conditions. This may lead to a phase change in CO2 during the injection process, affecting the supercritical state of CO2 and thus reducing its effectiveness in the reservoir. Utility Model Content

[0005] The purpose of this application is to address the problem that traditional supercritical injection devices typically employ simple pressure and temperature control methods, which cannot effectively control the temperature of CO2 under extreme temperature conditions. This may lead to a phase change in CO2 during the injection process, affecting the supercritical state of CO2 and thus reducing its effectiveness in the reservoir. This application provides a precisely controlled supercritical CO2 injection device.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A precisely controlled supercritical CO2 injection device includes a base, a pump casing fixedly connected to the top of the base, a rotor rotatably connected inside the pump casing, and a heat exchange chamber formed inside the pump casing, surrounding the rotor. A pump slot is formed at the top of the heat exchange chamber, and an impeller rotatably connected inside the pump slot. A circulation pipe is fixedly connected to one end of the pump slot. A compressor interstage temperature controller is fixedly connected to one end of the base. The output end of the compressor interstage temperature controller is fixedly connected to the first circulation pipe, and the input end of the compressor interstage temperature controller is fixedly connected to a second circulation pipe. The input end of the second circulation pipe communicates with the interior of the heat exchange chamber. A storage tank is fixedly connected to one end of the base, and an infusion pipe is fixedly connected to the output end of the storage tank, communicating with the interior of the pump casing. A drive mechanism is installed at one end of the pump casing, and a control component is installed at one end of the base.

[0008] By adopting the above technical solution and using the drive mechanism and control components in combination, the output power of the drive mechanism can be automatically adjusted based on data such as temperature, pressure, and flow rate when supercritical CO2 is extruded through the pump casing. This allows the rotor to drive the supercritical CO2 through the pump casing, while the compressor interstage temperature controller heats the heat exchange medium to a suitable temperature and guides the heat exchange medium to circulate between the heat exchange chamber and the compressor interstage temperature controller. This allows for heat exchange and temperature regulation between the pump casing and the supercritical CO2 passing through it, maintaining the supercritical state of the CO2. This facilitates automatic temperature control of the supercritical CO2 passing through the pump casing, effectively improving the practicality of the device.

[0009] Furthermore, the drive mechanism includes a motor fixedly connected to one end of the base, a synchronous pulley one fixedly connected to the output end of the motor, one end of the rotor passing through the pump casing and fixedly connected to a synchronous pulley two, a synchronous belt sleeved around the synchronous pulley one and the synchronous pulley two, and a transmission component installed at one end of the synchronous pulley two.

[0010] By adopting the above technical solution, and by setting up the cooperation of synchronous pulley one, synchronous pulley two, and synchronous belt, the starter motor can drive synchronous pulley one to rotate synchronously with synchronous belt, and synchronous pulley two can drive the rotor to rotate, thereby facilitating the rotation of the rotor.

[0011] Furthermore, the transmission assembly includes a bevel gear one fixedly connected to one end of the synchronous pulley two, a bevel gear two rotatably connected to one end of the pump casing and meshing with the bevel gear one, a transmission wheel one fixedly connected to one end of the bevel gear two, and one end of the impeller passing through the pump casing and fixedly connected to a transmission wheel two meshing with the transmission wheel one.

[0012] By adopting the above technical solution, and by setting up the cooperation of bevel gear one and bevel gear two, transmission wheel one and transmission wheel two, when the synchronous wheel two is driven to rotate, bevel gear one and bevel gear two are driven to mesh. At the same time, bevel gear two drives transmission wheel one and transmission wheel two to mesh. Thus, transmission wheel two drives the impeller to rotate and draws the heat exchange medium inside the circulation pipe one into the heat exchange chamber.

[0013] Furthermore, the control component includes a controller fixedly connected to one end of the base, a flow sensor fixedly connected to the output end of the storage tank, a solenoid valve fixedly connected to the output end of the infusion pipe, a pressure sensor fixedly connected to the output end of the pump housing, a temperature sensor fixedly connected to the input end of the pump housing, and the controller is electrically connected to the flow sensor, the solenoid valve, the pressure sensor, the temperature sensor, the motor, and the compressor stage temperature controller.

[0014] By adopting the above technical solution, and by setting up the controller in conjunction with the flow sensor, pressure sensor, temperature sensor, motor, and compressor stage temperature controller, the output power of the motor and compressor stage temperature controller can be automatically adjusted based on the monitoring data provided by the flow sensor, pressure sensor, and temperature sensor, effectively improving the output accuracy of the device.

[0015] Furthermore, the diameter of the first bevel gear is larger than the diameter of the second bevel gear.

[0016] By adopting the above technical solution, and by setting the diameter of bevel gear one to be larger than that of bevel gear two, it is convenient to utilize the diameter difference between bevel gear one and bevel gear two to increase the speed of the impeller, thereby creating a speed difference between the impeller and the rotor, which improves the practicality of the device.

[0017] Furthermore, a spiral guide plate is fixedly connected inside the heat exchange chamber.

[0018] By adopting the above technical solution, the travel distance of the heat exchange medium through the heat exchange chamber is effectively extended by setting a spiral guide plate, thereby improving the heat exchange efficiency of the heat exchange medium through the pump casing and supercritical CO2.

[0019] Furthermore, the pump casing is fixedly fitted with insulating rock wool.

[0020] By adopting the above technical solution, the heat exchange between the pump casing and the external environment is effectively reduced by setting up insulating rock wool, thereby improving the insulation effect inside the pump casing.

[0021] Furthermore, the inner wall of the pump casing is coated with a rubber-based coating.

[0022] By adopting the above technical solution and applying a rubber-based coating, the corrosion resistance of the pump casing inner wall is effectively improved, and the service life of the device is extended.

[0023] In summary, this application includes at least one of the following beneficial effects:

[0024] 1. By setting up the coordinated use of the drive mechanism and the control components, the output power of the drive mechanism can be automatically adjusted according to data such as temperature, pressure, and flow rate when supercritical CO2 is extruded through the pump casing. This allows the rotor to drive the supercritical CO2 through the pump casing, while the compressor interstage temperature controller heats the heat exchange medium to a suitable temperature and guides the heat exchange medium to circulate between the heat exchange chamber and the compressor interstage temperature controller. This allows for heat exchange and temperature regulation between the pump casing and the supercritical CO2 passing through it, maintaining the supercritical state of the CO2. This facilitates automatic temperature control of the supercritical CO2 passing through the pump casing, effectively improving the practicality of the device.

[0025] 2. By setting up the cooperation of bevel gear one and bevel gear two, transmission wheel one and transmission wheel two, when the synchronous wheel two is driven to rotate, bevel gear one and bevel gear two are driven to mesh. At the same time, bevel gear two drives transmission wheel one and transmission wheel two to mesh. Thus, transmission wheel two drives the impeller to rotate and draws the heat exchange medium inside the circulation pipe one into the heat exchange chamber. Attached Figure Description

[0026] Figure 1 This is a front structural diagram of the main body of the device in this application.

[0027] Figure 2 This is a schematic diagram of the rear structure of the main body of the device in this application.

[0028] Figure 3 This is a front sectional view of the main body of the device in this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Base; 2. Pump casing; 3. Rotor; 4. Heat exchange chamber; 5. Pump trough; 6. Impeller; 7. Circulation pipe one; 8. Compressor interstage temperature controller; 9. Circulation pipe two; 10. Storage tank; 11. Infusion pipe; 12. Motor; 13. Synchronous pulley one; 14. Synchronous pulley two; 15. Synchronous belt; 16. Bevel gear one; 17. Bevel gear two; 18. Drive wheel one; 19. Drive wheel two; 20. Controller; 21. Flow sensor; 22. Solenoid valve; 23. Pressure sensor; 24. Temperature sensor; 25. Spiral guide plate; 26. Thermal insulation rock wool. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses a precisely controlled supercritical CO2 injection device.

[0033] Reference Figures 1-3 A precisely controlled supercritical CO2 injection device includes a base 1, a pump casing 2 fixedly connected to the top of the base 1, a rotor 3 rotatably connected inside the pump casing 2, and a heat exchange chamber 4 opened inside the pump casing 2, the heat exchange chamber 4 surrounding the rotor 3, a pump groove 5 opened at the top of the heat exchange chamber 4, an impeller 6 rotatably connected inside the pump groove 5, a circulation pipe 7 fixedly connected to one end of the pump groove 5, a compressor stage temperature controller 8 fixedly connected to one end of the base 1, the output end of the compressor stage temperature controller 8 fixedly connected to the circulation pipe 7, a circulation pipe 9 fixedly connected to the input end of the compressor stage temperature controller 8, the input end of the circulation pipe 9 communicating with the interior of the heat exchange chamber 4, a storage tank 10 fixedly connected to one end of the base 1, an infusion pipe 11 fixedly connected to the output end of the storage tank 10, the infusion pipe 11 communicating with the interior of the pump casing 2, a drive mechanism installed at one end of the pump casing 2, and a control component installed at one end of the base 1.

[0034] The drive mechanism includes a motor 12 fixedly connected to one end of the base 1. The output end of the motor 12 is fixedly connected to a synchronous pulley 13. One end of the rotor 3 passes through the pump casing 2 and is fixedly connected to a synchronous pulley 14. A synchronous belt 15 is sleeved around the synchronous pulley 13 and the synchronous pulley 14. A transmission component is installed at one end of the synchronous pulley 14.

[0035] Furthermore, the transmission assembly includes a bevel gear 16 fixedly connected to one end of the synchronous pulley 14, a bevel gear 17 rotatably connected to one end of the pump housing 2 and meshing with the bevel gear 16, a transmission wheel 18 fixedly connected to one end of the bevel gear 17, and a transmission wheel 19 fixedly connected to one end of the impeller 6 passing through the pump housing 2 and meshing with the transmission wheel 18.

[0036] Furthermore, the control assembly includes a controller 20 fixedly connected to one end of the base 1, a flow sensor 21 fixedly connected to the output end of the storage tank 10, a solenoid valve 22 fixedly connected to the output end of the infusion pipe 11, a pressure sensor 23 fixedly connected to the output end of the pump housing 2, a temperature sensor 24 fixedly connected to the input end of the pump housing 2, and the controller 20 is electrically connected to the flow sensor 21, the solenoid valve 22, the pressure sensor 23, the temperature sensor 24, the motor 12, and the compressor stage temperature controller 8.

[0037] Furthermore, the diameter of bevel gear 16 is greater than the diameter of bevel gear 17.

[0038] In use, the motor 12 is started to drive the synchronous pulley 13 to rotate, and the synchronous pulley 13, together with the synchronous belt 15, drives the synchronous pulley 14 to rotate synchronously. This causes the synchronous pulley 14 to drive the rotor 3 to rotate, and the rotor 3 pushes the storage tank 10 through the infusion pipe 11 to introduce supercritical CO2 into the pump casing 2. The CO2 moves along the length of the pump casing 2 and is squeezed out of the pump casing 2 and injected into the required container.

[0039] Simultaneously, the synchronous pulley 14 drives the bevel gear 16 to mesh with the bevel gear 17, and the diameter difference between the bevel gear 16 and the bevel gear 17 increases the speed of the bevel gear 17. Then, the bevel gear 17 drives the transmission pulley 18 to mesh with the transmission pulley 19, and the transmission pulley 19 drives the impeller 6 to rotate rapidly. Thus, the impeller 6 guides the heat exchange medium from the compressor interstage temperature controller 8 through the circulation pipe 7 into the heat exchange chamber 4. After the heat exchange medium passes through the heat exchange chamber 4, it is introduced into the compressor interstage temperature controller 8 through the circulation pipe 9 for secondary temperature regulation. In this way, the heat exchange medium circulates through the compressor interstage temperature controller 8 and the heat exchange chamber 4, and exchanges heat and regulates the temperature with the supercritical CO2 passing through the pump casing 2 to maintain the supercritical state of CO2.

[0040] Furthermore, when supercritical CO2 is driven by rotor 3 to be introduced from inside storage tank 10 through infusion pipe 11 and pass through pump casing 2, solenoid valve 22 is first opened to connect storage tank 10 to pump casing 2 through infusion pipe 11. At the same time, flow sensor 21 is set to monitor the flow rate of supercritical CO2 entering pump casing 2 from storage tank 10. After supercritical CO2 enters pump casing 2, temperature sensor 24 is set to detect the temperature of supercritical CO2. When supercritical CO2 passes through the extrusion end of pump casing 2, pressure sensor 23 is set to monitor the internal pressure of pump casing 2. Finally, controller 20 collects the monitoring data of flow sensor 21, pressure sensor 23, and temperature sensor 24, and controls the output power of motor 12 and compressor stage temperature controller 8 to improve the extrusion accuracy of supercritical CO2.

[0041] Reference Figures 1-3 The heat exchange chamber 4 is internally fixedly connected with a spiral guide plate 25.

[0042] When in use, when the heat exchange medium is drawn through the heat exchange chamber 4 by the impeller 6, the heat exchange medium flows spirally through the interior of the heat exchange chamber 4 along the guiding direction of the spiral guide plate 25, which effectively extends the travel of the heat exchange medium through the interior of the heat exchange chamber 4 and improves the heat exchange efficiency of the heat exchange medium through the pump casing 2 and supercritical CO2.

[0043] Reference Figures 1-3 The outer periphery of the pump casing 2 is fixedly fitted with insulating rock wool 26.

[0044] During use, by fixing and covering the outer periphery of the pump casing 2 with thermal insulation rock wool 26, a thermal insulation protective layer is formed on the surface of the pump casing 2, which improves the thermal insulation effect inside the pump casing 2.

[0045] Reference Figure 1 and Figure 2 The inner wall of pump casing 2 is coated with a rubber-based coating.

[0046] During use, by coating the inner wall of the pump casing 2 with a rubber-based coating, a protective anti-corrosion layer is formed on the inner wall of the pump casing 2, which effectively improves the corrosion resistance of the inner wall of the pump casing 2 and extends the service life of the pump casing 2.

[0047] The implementation principle of a precisely controlled supercritical CO2 injection device in this embodiment is as follows: First, the solenoid valve 22 is opened, so that the storage tank 10 is connected to the inside of the pump shell 2 through the infusion pipe 11. At the same time, the flow sensor 21 is set to monitor the flow rate of supercritical CO2 input from the storage tank 10 into the pump shell 2. After the supercritical CO2 enters the pump shell 2, the temperature sensor 24 is set to detect the temperature of the supercritical CO2. When the supercritical CO2 passes through the extrusion end of the pump shell 2, the pressure sensor 23 is set to monitor the internal pressure of the pump shell 2. Finally, the controller 20 collects the monitoring data of the flow sensor 21, the pressure sensor 23, and the temperature sensor 24, and controls and adjusts the output power of the motor 12 and the compressor stage temperature controller 8.

[0048] At the same time, the starting motor 12 drives the synchronous pulley 13 to rotate, and the synchronous pulley 13, together with the synchronous belt 15, drives the synchronous pulley 14 to rotate synchronously. This causes the synchronous pulley 14 to drive the rotor 3 to rotate, and the rotor 3 pushes the storage tank 10 to introduce supercritical CO2 into the pump casing 2 through the infusion pipe 11. The CO2 moves along the length of the pump casing 2 and is squeezed out of the pump casing 2 and injected into the required container.

[0049] Furthermore, the synchronous pulley 14 drives the bevel gear 16 and bevel gear 17 to mesh, and the diameter difference between bevel gear 16 and bevel gear 17 increases the speed of bevel gear 17. Then, bevel gear 17 drives the transmission pulley 18 and transmission pulley 19 to mesh, and the transmission pulley 19 drives the impeller 6 to rotate rapidly. Thus, the impeller 6 guides the heat exchange medium from the compressor interstage temperature controller 8 through the circulation pipe 7 into the heat exchange chamber 4. After the heat exchange medium passes through the heat exchange chamber 4, it is introduced into the compressor interstage temperature controller 8 through the circulation pipe 9 for secondary temperature regulation. In this way, the heat exchange medium circulates through the compressor interstage temperature controller 8 and the heat exchange chamber 4, and exchanges heat and regulates the temperature with the supercritical CO2 passing through the pump casing 2 to maintain the supercritical state of CO2.

Claims

1. A precisely controlled supercritical CO2 injection device, comprising a base (1), characterized in that: A pump casing (2) is fixedly connected to the top of the base (1). A rotor (3) is rotatably connected inside the pump casing (2). A heat exchange chamber (4) is provided inside the pump casing (2). The heat exchange chamber (4) surrounds the rotor (3). A pump groove (5) is provided at the top of the heat exchange chamber (4). An impeller (6) is rotatably connected inside the pump groove (5). A circulation pipe (7) is fixedly connected to one end of the pump groove (5). A compressor interstage temperature controller (8) is fixedly connected to one end of the base (1). The output end of the controller (8) is fixedly connected to the first circulation pipe (7). The input end of the compressor stage temperature controller (8) is fixedly connected to the second circulation pipe (9). The input end of the second circulation pipe (9) is connected to the interior of the heat exchange chamber (4). One end of the base (1) is fixedly connected to the storage tank (10). The output end of the storage tank (10) is fixedly connected to the infusion pipe (11). The infusion pipe (11) is connected to the interior of the pump casing (2). One end of the pump casing (2) is equipped with a drive mechanism. One end of the base (1) is equipped with a control component.

2. The precisely controlled supercritical CO2 injection device according to claim 1, characterized in that: The drive mechanism includes a motor (12) fixedly connected to one end of the base (1). The output end of the motor (12) is fixedly connected to a first synchronous pulley (13). One end of the rotor (3) passes through the pump casing (2) and is fixedly connected to a second synchronous pulley (14). A synchronous belt (15) is sleeved around the first synchronous pulley (13) and the second synchronous pulley (14). A transmission component is installed at one end of the second synchronous pulley (14).

3. The precisely controlled supercritical CO2 injection device according to claim 2, characterized in that: The transmission assembly includes a bevel gear 1 (16) fixedly connected to one end of the synchronous pulley 2 (14), a bevel gear 2 (17) rotatably connected to one end of the pump housing (2) and meshing with the bevel gear 1 (16), a transmission wheel 1 (18) fixedly connected to one end of the bevel gear 2 (17), and one end of the impeller (6) passing through the pump housing (2) and fixedly connected with a transmission wheel 2 (19) meshing with the transmission wheel 1 (18).

4. The precisely controlled supercritical CO2 injection device according to claim 1, characterized in that: The control assembly includes a controller (20) fixedly connected to one end of the base (1), a flow sensor (21) fixedly connected to the output end of the storage tank (10), a solenoid valve (22) fixedly connected to the output end of the infusion pipe (11), a pressure sensor (23) fixedly connected to the output end of the pump housing (2), a temperature sensor (24) fixedly connected to the input end of the pump housing (2), and the controller (20) is electrically connected to the flow sensor (21), the solenoid valve (22), the pressure sensor (23), the temperature sensor (24), the motor (12), and the compressor stage temperature controller (8).

5. The precisely controlled supercritical CO2 injection device according to claim 3, characterized in that: The diameter of the first bevel gear (16) is greater than the diameter of the second bevel gear (17).

6. The precisely controlled supercritical CO2 injection device according to claim 1, characterized in that: The heat exchange chamber (4) is internally fixedly connected to a spiral guide plate (25).

7. The precisely controlled supercritical CO2 injection device according to claim 1, characterized in that: The pump casing (2) is fixedly fitted with insulating rock wool (26) on its outer periphery.

8. The precisely controlled supercritical CO2 injection device according to claim 1, characterized in that: The inner wall of the pump casing (2) is coated with a rubber-based coating.

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