A high-temperature and high-pressure CO2-water-rock interaction experimental device and method

Abstract

This invention provides a high-temperature, high-pressure CO2-water-rock interaction experimental device and method, relating to the field of coal equipment technology. The experimental device is equipped with a motor that rotates a reactor; a liquid guide plate is located within the reactor. The experimental device has the advantages of reasonable design, strong practicality, and ease of use. Using this experimental device, CO2-water-rock interaction experiments can be conducted more effectively and accurately.

Description

Technical Field

[0001] The present invention relates to the field of CCUS technology, and in particular to a high-temperature and high-pressure CO2-water-rock interaction experimental device and method. Background Art

[0002] The high-temperature, high-pressure CO2-water-rock interaction experiment is of great significance to the CCUS (carbon capture, utilization and storage) industry. Through this experiment, it is possible to evaluate the types of transformations that may occur in rock minerals after CO2 injection, determine the minerals that dissolve and precipitate, and provide a basis for the construction of related CCUS projects.

[0003] The reactor is an indispensable device in CO2-water-rock interaction experiments. Currently, there are many types of reactors, such as reactors with different temperature and pressure ranges, reactors with stirring function, etc. Among them, the stirring function of the reactor can make the liquid and rock in dynamic contact, thereby improving the uniformity of the reaction. However, there are still some problems when using reactors with stirring devices. First, extremely high sealing is required to ensure the high temperature and high pressure requirements in the reactor. Second, when the stirring device is in use, it itself may cause physical damage to the rock sample, affecting subsequent analysis. Third, due to the influence of the position of the stirring shaft and stirring blades, it is easy to generate excessive local shear force, resulting in uneven flow, affecting the uniformity of the reaction. Summary of the Invention

[0004] In light of this, the present invention provides a high-temperature, high-pressure CO₂-water-rock interaction experimental device and method. The experimental device is equipped with a motor that rotates a reactor and a liquid guide plate within the reactor. The experimental device has the advantages of reasonable design, strong practicality, and convenient use.

[0005] The technical solutions of the present invention are as follows:

[0006] A high-temperature and high-pressure CO2-water-rock interaction experimental device, comprising a CO2 gas tank, an air compressor, a gas pressurization system and a reactor;

[0007] The reactor comprises a reactor body, on which a sealing cover is provided;

[0008] A connecting cylinder is provided on the sealing cover, a sealing head is provided on the connecting cylinder, and the sealing head and the connecting cylinder are detachably connected;

[0009] An air inlet pipe A and an air outlet pipe A are provided on the connecting tube, and the air inlet pipe A is connected to the air outlet pipe B of the gas boosting system;

[0010] A motor is provided above the reactor body, and the output shaft of the motor is connected to the top surface of the head; when the motor is working, it can drive the reactor to rotate;

[0011] A wavy liquid guide plate is provided on the inner side of the kettle body, and the liquid guide plate is arranged obliquely;

[0012] The tilted liquid guide plate has a smaller distance between its bottom end and the bottom surface of the kettle body. Therefore, as the kettle body rotates, the flow rate of the liquid passing through the gap between the bottom end of the liquid guide plate and the bottom surface of the kettle body changes significantly, so that the fluid near the bottom of the rock sample can also better participate in the erosion process, thereby improving the uniformity of the reaction; and since no mechanical stirring structure is added to the kettle body, physical damage to the sample can be avoided, thereby improving the accuracy of subsequent test results.

[0013] Preferably, the outlet pipe C of the CO2 gas tank is connected to the inlet pipe B of the gas boosting system, and the outlet pipe D of the air compressor is connected to the inlet pipe C of the gas boosting system.

[0014] Preferably, a buckle is provided on the connecting tube and a block is provided on the head. The buckle and the block are used in conjunction with each other to achieve a detachable connection between the head and the connecting tube. This setting can quickly and efficiently connect the head and the connecting tube, and is more efficient than the current bolt connection.

[0015] Preferably, the kettle body is a double-layer structure, and an electric heating element is provided between the double-layer structure of the kettle body for heating the interior of the reactor to maintain the reactor at a certain temperature.

[0016] Preferably, a valve A is provided on the air inlet pipe A, and a valve B is provided on the air outlet pipe A; a steam trap is connected to the air outlet pipe A, and the gas outlet of the steam trap is connected to the CO2 recovery tank; when the reactor needs to be depressurized, valve B is activated, and the exhausted gas is processed by the steam trap, the CO2 gas enters the recovery tank, and the water is discharged.

[0017] Preferably, the liquid guide plate is a silica gel plate, which can avoid physical damage to the rock sample during the guiding process and improve the accuracy of the experiment.

[0018] Preferably, a base is provided under the reactor, a telescopic support rod is provided on the base, and the top of the telescopic support rod is slidably connected to the bottom surface of the reactor; a gantry is provided on the base, and the motor is located on the gantry; during the rotation of the reactor, the telescopic support rod can provide support for the reactor and make it more stable during the rotation process.

[0019] Preferably, the telescopic support rod includes a first rod and a second rod, the first rod is sleeved on the outside of the second rod; the bottom end of the first rod is connected to the base; a plurality of through holes A are provided on the first rod, and a plurality of through holes B are provided on the second rod; when the telescopic support rod reaches the specified position, a pin shaft is used to pass through the corresponding through holes A and through holes B to achieve height positioning of the telescopic support rod.

[0020] Preferably, a bearing is provided on the outside of the kettle body, and a connecting plate is provided on the outer ring of the bearing; at least two telescopic devices are provided on the base, and the top of the telescopic device is connected to the bottom surface of the connecting plate; the bottom end of the gantry is connected to the top surface of the connecting plate; the telescopic device is activated to adjust the height of the reactor, and when the reactor is raised and lowered and rotated simultaneously, the flow direction of the solution in the reactor can be further changed, thereby improving the uniformity of the reaction.

[0021] Preferably, a pressure sensor and a temperature sensor are provided on the head for monitoring the temperature and pressure in the reactor.

[0022] The method of using the above-mentioned high-temperature and high-pressure CO2-water-rock interaction experimental device is as follows:

[0023] (1) Connect the CO2 gas tank, air compressor, gas boosting system and reactor;

[0024] (2) Open the head, put the rock sample and water required for the experiment into the reactor, and lock the head and connecting tube with buckles and blocks;

[0025] (3) The reactor is connected to the power supply and the electric heating element is started to make the temperature inside the reactor reach the temperature required for the experiment;

[0026] (4) Open the CO2 gas tank and air compressor, and pump air into the gas boosting system tank;

[0027] (5) After the gas boosting system is inflated, close the CO2 gas tank inlet switch and the air compressor inlet switch of the gas boosting system, open the energy storage pressure switch and the outgoing gas switch of the gas boosting system, and fill the reactor with CO2 gas and adjust it to the rated pressure; control the inlet and outlet of CO2 gas through valve A and valve B to keep the reaction at the rated temperature and pressure;

[0028] (6) After the reaction is completed, the reactor is depressurized, the CO2 gas is collected, the rock sample is taken out, and the experiment ends.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: by providing a detachably connected connecting tube and head, the sample can be conveniently put into the reactor; by providing a motor and using the motor to rotate the reactor, the solution in the reactor can flow with the reactor, so that the rock sample and the solution can be in dynamic contact, thereby improving the uniformity of the reaction; after the dynamic reaction, the motor is stopped, so that the reactor is in a static pile body, and a long-term mineralization reaction is carried out at the rated temperature and pressure, making the experimental device more flexible when used; by providing a liquid guide plate, combined with the rotating movement of the reactor, the flow rate and flow direction of the solution are effectively changed, while maintaining the uniform reaction, physical damage to the sample can be avoided, thereby improving the accuracy of subsequent test results. The above-mentioned settings make the experimental device have the advantages of reasonable design, strong practicality and easy use. Using this experimental device, CO2-water-rock interaction experiments can be carried out effectively and more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 Schematic diagram of the experimental device of the present invention.

[0032] Figure 2 This is an enlarged view of the M section.

[0033] In the figure, 1-CO2 gas tank, 101-outlet pipe C, 2-air compressor, 201-outlet pipe D, 3-gas booster system, 301-inlet pipe B, 302-inlet pipe C, 303-outlet pipe B, 401-kettle body, 402-sealing cover, 403-connecting tube, 5-electric heating element, 6-head, 7-buckle, 8-block, 9-pressure sensor, 10-temperature sensor, 11-inlet pipe A, 12-outlet pipe A, 13-valve A, 14-valve B, 15-drain trap, 16-recovery tank, 17-base, 1801-first rod, 1802-second rod, 19-pin, 20-annular slide, 21-ball, 22-bearing, 23-connecting plate, 24-telescopic device, 25-gantry, 26-motor, 27-liquid guide plate. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described 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 should fall within the scope of protection of the present invention.

[0035] Example 1

[0036] Combine Figure 1 and Figure 2 The present invention provides a high-temperature and high-pressure CO2-water-rock interaction experimental device, comprising a CO2 gas tank 1, an air compressor 2, a gas pressurizing system 3 and a reactor;

[0037] The reactor comprises a reactor body 401 , on which a sealing cover 402 is provided;

[0038] The reactor is made of GH4169 nickel-based high-temperature alloy; its rated temperature resistance is 400°C, pressure is 400MPa, and capacity is 500ml;

[0039] The kettle body 401 is a double-layer structure. An electric heating element 5 is provided between the double-layer structure of the kettle body 401. In this embodiment, the electric heating wire is used to heat the interior of the reactor to maintain the reactor at a certain temperature.

[0040] A connecting tube 403 is provided on the sealing cover 402, and a sealing head 6 is provided on the connecting tube 403. The sealing head 6 is detachably connected to the connecting tube 403.

[0041] In this embodiment, a buckle 7 is provided on the connecting tube 403, and a block 8 is provided on the head 6. The buckle 7 and the block 8 cooperate to realize a detachable connection between the head 6 and the connecting tube 403. This arrangement can quickly and efficiently connect the head 6 and the connecting tube 403, and is more efficient than the current bolt connection.

[0042] A pressure sensor 9 and a temperature sensor 10 are provided on the head 6 for monitoring the temperature and pressure in the reactor; the pressure sensor 9 and the temperature sensor 10 are both located inside the reactor body 401;

[0043] The pressure sensor 9 is connected to a pressure display, which displays the pressure value in the reactor in real time. When the pressure is too high, gas is discharged through the outlet pipe A12 to reduce the pressure in the reactor. When the pressure is too low, CO2 gas is introduced into the reactor through the outlet pipe B303 of the gas boosting system 3 to increase the pressure in the reactor.

[0044] The temperature sensor 10 and the electric heating element are both electrically connected to the PLC, which is connected to a temperature display. By setting the experimental temperature, the PLC sends a signal to the electric heating element, which adjusts the temperature of the reactor. The temperature sensor 10 monitors the temperature value inside the reactor in real time to improve the temperature control accuracy. If the temperature inside the reactor is lower than the set experimental temperature, the electric heating element starts heating. If the temperature inside the reactor is greater than or equal to the set experimental temperature, the electric heating element stops heating.

[0045] In this application, the temperature sensor is a PT100 temperature sensor and the pressure sensor is a resistance strain gauge sensor;

[0046] An air inlet pipe A11 and an air outlet pipe A12 are provided on the connecting tube 403. The air inlet pipe A11 is connected to the air outlet pipe B303 of the gas boosting system 3.

[0047] An air inlet pipe B301 and an air inlet pipe C302 are provided on the gas boosting system 3. The air inlet pipe B301 is connected to the air outlet pipe C101 of the CO2 gas tank 1, and the air inlet pipe C302 is connected to the air outlet pipe D201 of the air compressor 2; the air outlet pipe B303 of the gas boosting system 3 is connected to the air inlet pipe A11 of the reactor; when in use, the air outlet pipe C101 of the CO2 gas tank 1 is connected to the air inlet pipe B301 of the gas boosting system 3, so that the CO2 gas enters the gas storage tank of the gas boosting system 3; the air outlet pipe D201 of the air compressor 2 is connected to the air inlet pipe C302 of the gas boosting system 3, so that the driving device in the gas boosting system 3 generates a driving force, thereby pressurizing the CO2 gas in the gas storage tank, and the pressurized CO2 gas enters the reactor through the air inlet pipe A11 on the connecting tube 403, and the pressure of the reactor is controlled;

[0048] A valve A13 is provided on the air inlet pipe A11, and a valve B14 is provided on the air outlet pipe A12. A steam trap 15 is connected to the air outlet pipe A12, and the gas outlet of the steam trap 15 is connected to the CO2 recovery tank 16. When the reactor needs to be depressurized, valve B14 is activated, and the exhausted gas is processed by the steam trap 15. The CO2 gas enters the recovery tank 16, and the water is discharged.

[0049] A base 17 is provided below the reactor, and a telescopic support rod is provided on the base 17, the top of which is slidably connected to the bottom surface of the reactor;

[0050] The telescopic support rod includes a first rod 1801 and a second rod 1802. The first rod 1801 is sleeved outside the second rod 1802. The bottom end of the first rod 1801 is connected to the base 17. A through hole A (not shown) is provided in the first rod 1801, and a through hole B (not shown) is provided in the second rod 1802. When the telescopic support rod reaches a specified position, a pin 19 is inserted through the corresponding through hole A and through hole B to achieve height positioning of the telescopic support rod.

[0051] An annular chute 20 is provided on the bottom surface of the reactor, and a ball 21 is provided on the top end of the second rod 1802; the top end of the second rod 1802 is located in the annular chute 20, and the ball 21 contacts the bottom surface of the reactor;

[0052] A bearing 22 is sleeved on the outside of the kettle body 401, and a connecting plate 23 is provided on the outer ring of the bearing 22; two telescopic devices 24 are provided on the base 17, and the top ends of the telescopic devices 24 are connected to the bottom surfaces of the connecting plates 23; in this embodiment, the telescopic devices 24 are electric push rods;

[0053] A gantry 25 is provided on the connecting plate 23, the bottom end of the gantry 25 is connected to the connecting plate 23, and a motor 26 is provided on the crossbeam of the gantry 25, the output shaft of the motor 26 is connected to the top surface of the head 6; when the motor 26 is working, it can drive the reactor to rotate;

[0054] During the rotation of the reactor, the telescopic support rod can provide support for the reactor and make it more stable during the rotation;

[0055] Two wavy liquid guide plates 27 are provided on the inner side of the kettle body 401. The liquid guide plates 27 are provided at an angle. The two liquid guide plates 27 are provided on opposite inner walls of the kettle body 401.

[0056] like Figure 1 When the reactor rotates clockwise, the liquid guide plate 27 tilts with the left side higher and the right side lower;

[0057] The liquid guide plate 27 is a silicone plate, which can avoid physical damage to the rock sample during the guiding process and improve the accuracy of the experiment;

[0058] The inclined liquid guide plate 27 has a smaller distance between its bottom end and the bottom surface of the kettle body 401. Therefore, as the kettle body 401 rotates, the flow rate of the liquid passing through the gap between the bottom end of the liquid guide plate 27 and the bottom surface of the kettle body 401 changes significantly, allowing the fluid near the bottom of the rock sample to better participate in the erosion process, thereby improving the uniformity of the reaction. Moreover, since no mechanical stirring structure is added to the kettle body 401, physical damage to the sample can be avoided, thereby improving the accuracy of subsequent test results.

[0059] Start the telescopic device and remove the pin 19 to adjust the height of the reactor. When the reactor is lifted and rotated at the same time, the flow direction of the solution in the reactor can be further changed, thereby improving the uniformity of the reaction.

[0060] Example 2

[0061] The method for using the high-temperature and high-pressure CO2-water-rock interaction experimental device provided in Example 1 is as follows:

[0062] (1) Connect the outlet pipe C101 of the CO2 tank 1 and the outlet pipe D201 of the air compressor 2 to the inlet pipe B301 and the inlet pipe C302 of the gas boosting system 3 respectively, and connect the outlet pipe B303 of the gas boosting system 3 to the inlet pipe A11 of the reactor;

[0063] (2) Open the head 6, put the rock sample and water required for the experiment into the reactor, and lock the head 6 and the connecting tube 403 using the buckle 7 and the block 8;

[0064] In this experiment, the sample is a basalt sample, and the sample particles are processed to 0.3-0.35mm. The water sample is uniformly Wahaha purified water sample;

[0065] (3) The air compressor 2, temperature display, and pressure display are all connected to the power supply; set the temperature and start the electric heating element 5 to make the temperature in the reactor reach the temperature required for the experiment;

[0066] (4) Open the CO2 tank 1 and the air compressor 2, and fill the gas tank of the gas boosting system 3 with gas;

[0067] (5) After the gas boosting system 3 is inflated, close the CO2 gas tank 1 air inlet switch and the air compressor 2 air inlet switch of the gas boosting system 3, open the energy storage pressure switch and the outgoing gas switch of the gas boosting system 3, and fill the reactor with CO2 gas and adjust it to the rated pressure; control the inlet and outlet of CO2 gas through valve A13 and valve B14 to keep the reaction at the rated temperature and pressure;

[0068] (6) After the reaction is completed, the reactor is depressurized, CO2 gas is collected, and the water sample and rock sample after the experiment are taken out. The water sample is filtered and the rock sample is dried. Finally, the treated rock sample and water sample are sent to a detection agency for detection and analysis, and the experiment is completed. Although the present invention has been described in detail by reference to the preferred embodiment, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, ordinary technicians in this field can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should be within the scope of the present invention. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A high-temperature and high-pressure CO2-water-rock interaction experimental device, characterized in that: Including CO2 gas tank, air compressor, gas boosting system and reactor; The reactor comprises a reactor body, on which a sealing cover is provided; A connecting cylinder is provided on the sealing cover, a sealing head is provided on the connecting cylinder, and the sealing head and the connecting cylinder are detachably connected; An air inlet pipe A and an air outlet pipe A are provided on the connecting tube, and the air inlet pipe A is connected to the air outlet pipe B of the gas boosting system; A motor is provided above the reactor body, and the output shaft of the motor is connected to the top surface of the head; when the motor is working, it can drive the reactor to rotate; A wavy liquid guide plate is provided on the inner side of the kettle body, and the liquid guide plate is arranged obliquely; The liquid guide plate is a silica gel plate; A base is provided below the reactor, a telescopic support rod is provided on the base, the top end of the telescopic support rod is slidably connected to the bottom surface of the reactor; a gantry is provided on the base, and the motor is located on the gantry; A bearing is sleeved on the outside of the kettle body, and a connecting plate is provided on the outer ring of the bearing; at least two telescopic devices are provided on the base, and the top of the telescopic device is connected to the bottom surface of the connecting plate; the bottom end of the gantry is connected to the top surface of the connecting plate.

2. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, characterized in that: The outlet pipe C of the CO2 gas tank is connected to the inlet pipe B of the gas boosting system, and the outlet pipe D of the air compressor is connected to the inlet pipe C of the gas boosting system.

3. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, characterized in that: A buckle is provided on the connecting tube, and a block is provided on the sealing head. The buckle and the block are used in conjunction with each other. A pressure sensor and a temperature sensor are provided on the sealing head.

4. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, characterized in that: The kettle body is a double-layer structure, and an electric heating element is arranged between the double-layer structures of the kettle body.

5. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, characterized in that: A valve A is provided on the air inlet pipe A, and a valve B is provided on the air outlet pipe A; a steam trap is connected to the air outlet pipe A, and the gas outlet of the steam trap is connected to the CO2 recovery tank.

6. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, characterized in that: The telescopic support rod includes a first rod and a second rod, the first rod is sleeved on the outside of the second rod; the bottom end of the first rod is connected to the base; a plurality of through holes A are provided on the first rod, and a plurality of through holes B are provided on the second rod; when the telescopic support rod reaches a specified position, a pin is used to pass through the corresponding through holes A and B.

7. A method for using the high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, characterized in that: The process is as follows: (1) Connect the CO2 gas tank, air compressor, gas boosting system and reactor; (2) Open the head, put the rock sample and water required for the experiment into the reactor, and lock the head and connecting tube with buckles and blocks; (3) The reactor is connected to the power supply and the electric heating element is started to make the temperature inside the reactor reach the temperature required for the experiment; (4) Open the CO2 gas tank and air compressor, and pump air into the gas boosting system tank; (5) After the gas boosting system is inflated, close the CO2 gas tank inlet switch and the air compressor inlet switch of the gas boosting system, open the energy storage pressure switch and the outgoing gas switch of the gas boosting system, and fill the reactor with CO2 gas and adjust it to the rated pressure; control the inlet and outlet of CO2 gas through valve A and valve B to keep the reaction at the rated temperature and pressure; (6) After the reaction is completed, the reactor is depressurized, the CO2 gas is collected, the rock sample is taken out, and the experiment ends.

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