High-temperature and high-pressure CO2-water-rock action experimental device and method

Abstract

The invention provides a high-temperature and high-pressure CO2-water-rock action experimental device and method, and relates to the technical field of coal equipment, the experimental device is provided with a motor, and the motor can make a reaction kettle rotate; and a liquid guide plate is arranged in the reaction kettle. The experimental device has the advantages of being reasonable in design, high in practicability and convenient to use; by using the experimental device, the CO2-water-rock action experiment can be effectively and more accurately carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of CCUS, and particularly relates to an experimental device and method for high-temperature and high-pressure CO2-water-rock interaction. Background Art

[0002] The experiment of high-temperature and high-pressure CO2-water-rock interaction is of great significance in the CCUS (Carbon Capture, Utilization and Storage) industry; through this experiment, the possible transformation types of rock minerals after CO2 injection can be evaluated, and the minerals that dissolve and precipitate can be determined, providing a basis for the construction of relevant CCUS projects.

[0003] The reaction kettle is an essential device in the CO2-water-rock interaction experiment. There are various types of reaction kettles currently, such as reaction kettles with different temperature and pressure ranges, reaction kettles with stirring functions, etc.; among them, the stirring function of the reaction kettle can make the liquid contact with the rock dynamically and improve the uniformity of the reaction; however, when using a reaction kettle with a stirring device, there are still some problems. One is that it requires extremely high sealing performance to ensure the high-temperature and high-pressure requirements inside the reaction kettle; the second is that when the stirring device is used, it may cause physical damage to the rock sample and affect subsequent analysis; the third is that affected by the position of the stirring shaft and stirring blades, it is easy to generate excessive local shear force, resulting in uneven flow and affecting the uniformity of the reaction. Summary of the Invention

[0004] In view of this, the present invention provides an experimental device and method for high-temperature and high-pressure CO2-water-rock interaction. The experimental device is provided with a motor, and the motor can make the reaction kettle rotate; a liquid guide plate is arranged inside the reaction kettle. This experimental device has the advantages of reasonable design, strong practicability and convenient use.

[0005] The technical solution of the present invention is as follows: An experimental device for high-temperature and high-pressure CO2-water-rock interaction, comprising a CO2 gas tank, an air compressor, a gas boosting system and a reaction kettle; The reaction kettle includes a kettle body, and a sealing cover is arranged on the kettle body; A connecting cylinder is arranged on the sealing cover, and a head is arranged on the connecting cylinder. The head is detachably connected to the connecting cylinder; An air inlet pipe A and an air outlet pipe A are arranged on the connecting cylinder. The air inlet pipe A is connected to the air outlet pipe B of the gas boosting system; A motor is arranged above the kettle body, and the output shaft of the motor is connected to the top surface of the head; when the motor works, it can drive the reaction kettle to rotate; A wavy liquid guide plate is arranged on the inner side surface of the kettle body, and the liquid guide plate is inclined; The liquid guide plate is inclined, and the distance between its bottom end and the inner bottom surface of the kettle body becomes smaller. Therefore, when the kettle body rotates, the flow velocity of the liquid passing through the gap between the bottom end of the liquid guide plate and the inner bottom surface of the kettle body changes greatly, so that the fluid near the bottom of the rock sample can also better participate in the erosion process, improving the uniformity of the reaction. And since no mechanical stirring structure is added inside the kettle body, physical damage to the sample can be avoided, improving the accuracy of subsequent detection results.

[0006] 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.

[0007] Preferably, a buckle is provided on the connecting cylinder, and a latch block is provided on the head. The buckle and the latch block are used in cooperation to realize the detachable connection between the head and the connecting cylinder. This setting can quickly and efficiently connect the head and the connecting cylinder, and has higher efficiency compared with the current bolt connection.

[0008] Preferably, the kettle body is of a double-layer structure, and an electric heating element is provided between the double-layer structures of the kettle body for heating the inside of the reaction kettle to keep the reaction kettle at a certain temperature.

[0009] Preferably, a valve A is provided on the inlet pipe A, and a valve B is provided on the outlet pipe A. A steam trap is connected to the outlet pipe A, and the gas outlet of the steam trap is connected to the CO2 recovery tank. When the reaction kettle needs to be depressurized, valve B is started, and after the discharged gas is treated by the steam trap, the CO2 gas enters the recovery tank and the water is discharged.

[0010] 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.

[0011] Preferably, a base is provided below the reaction kettle, and 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 reaction kettle. A gantry is provided on the base, and the motor is located on the gantry. During the rotation of the reaction kettle, the telescopic support rod can support the reaction kettle and make it more stable during the rotation.

[0012] Preferably, the telescopic support rod includes a first rod and a second rod. The first rod is sleeved outside 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 B to realize the height positioning of the telescopic support rod.

[0013] Preferably, a bearing is sleeved outside the kettle body, and a connecting plate is arranged on the outer ring of the bearing; at least two telescopic devices are arranged on the base, and the top ends of the telescopic devices are 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; by starting the telescopic devices, the height of the reactor can be adjusted, and when the reactor is lifted and rotated simultaneously, the flow direction of the solution in the reactor can be further changed, improving the uniformity of the reaction.

[0014] Preferably, a pressure sensor and a temperature sensor are arranged on the head for monitoring the temperature and pressure inside the reactor.

[0015] The usage method of the above high-temperature and high-pressure CO2-water-rock interaction experimental device is as follows: (1) Connect the CO2 gas cylinder, air compressor, gas booster system and the reactor; (2) Open the head, put the rock samples and water required for the experiment into the reactor, and use the buckles and blocks to lock the head and the connecting cylinder; (3) Connect the reactor to the power supply and start the electric heating element to make the temperature inside the reactor reach the required temperature for the experiment; (4) Open the CO2 gas cylinder and the air compressor to pump air into the gas cylinder of the gas booster system; (5) After the gas booster system is inflated, close the CO2 gas cylinder inlet switch and the air compressor inlet switch of the gas booster system, open the energy storage pressure switch and the gas output switch of the gas booster system, and fill the reactor with CO2 gas, adjusting to the rated pressure; control the inlet and outlet of CO2 gas through valve A and valve B to keep the reaction proceeding under the rated temperature and pressure; (6) After the reaction is completed, relieve the pressure of the reactor, collect the CO2 gas, take out the rock samples, and the experiment ends.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by providing a detachable connecting cylinder and a head, samples can be conveniently put into the reactor; by providing a motor and using the motor to rotate the reactor, the solution inside the reactor can flow along with the reactor, so that the rock samples and the solution can be in dynamic contact, improving the reaction uniformity; after the dynamic reaction, stop the motor action to make the reactor in a static state, and carry out a long-term mineralization reaction under the rated temperature and pressure, making the experimental device more flexible to use; by providing a liquid guide plate and combining it with the rotational movement of the reactor, the flow rate and flow direction of the solution can be effectively changed, while keeping the reaction proceeding uniformly, it can avoid physical damage to the samples and improve the accuracy of subsequent detection results. The above settings make the experimental device have the advantages of reasonable design, strong practicability and convenient use. Using this experimental device, the CO2-water-rock interaction experiment can be carried out effectively and more accurately. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the experimental device of the present invention.

[0019] Figure 2 It is an enlarged view of part M.

[0020] In the figure, 1 - CO2 gas tank, 101 - outlet pipe C, 2 - air compressor, 201 - outlet pipe D, 3 - gas boosting system, 301 - inlet pipe B, 302 - inlet pipe C, 303 - outlet pipe B, 401 - kettle body, 402 - sealing cover, 403 - connecting cylinder, 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 - steam trap, 16 - recovery tank, 17 - base, 1801 - first rod, 1802 - second rod, 19 - pin shaft, 20 - annular chute, 21 - ball, 22 - bearing, 23 - connecting plate, 24 - telescopic device, 25 - gantry, 26 - motor, 27 - liquid guide plate. Detailed implementation manners

[0021] To enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1 Combined with Figure 1 and Figure 2 , the present invention provides a high - temperature and high - pressure CO2 - water - rock interaction experimental device, including a CO2 gas tank 1, an air compressor 2, a gas boosting system 3 and a reaction kettle; The reaction kettle includes a kettle body 401, and a sealing cover 402 is provided on the kettle body 401; The reaction kettle is made of a nickel - based superalloy of GH4169 type; its rated temperature resistance is 400 °C, the pressure is 400 MPa, and the capacity is 500 ml; The kettle body 401 has a double-layer structure, and an electric heating element 5, which is an electric heating wire in this embodiment, is provided between the double-layer structures of the kettle body 401 for heating the inside of the reaction kettle to keep the reaction kettle at a certain temperature; A connecting cylinder 403 is provided on the sealing cover 402, and a head 6 is provided on the connecting cylinder 403. The head 6 is detachably connected to the connecting cylinder 403; In this embodiment, a buckle 7 is provided on the connecting cylinder 403, and a latch 8 is provided on the head 6. The buckle 7 and the latch 8 are used in cooperation to realize the detachable connection between the head 6 and the connecting cylinder 403; this setting can quickly and efficiently connect the head 6 and the connecting cylinder 403, and has higher efficiency compared with the current bolt connection; A pressure sensor 9 and a temperature sensor 10 are provided on the head 6 for monitoring the temperature and pressure inside the reaction kettle; both the pressure sensor 9 and the temperature sensor 10 are located inside the kettle body 401; The pressure sensor 9 is connected to a pressure display, and the pressure display real-time displays the pressure value inside the reaction kettle; when the pressure is too high, gas is discharged through the air outlet pipe A12 to reduce the pressure inside the reaction kettle; when the pressure is too low, CO2 gas is introduced into the reaction kettle through the air outlet pipe B303 of the gas boosting system 3 to increase the pressure inside the reaction kettle; The temperature sensor 10 and the electric heating element are both electrically connected to the PLC. The PLC is connected to a temperature display. By setting the experimental temperature, the PLC sends a signal to the electric heating element, and the electric heating element adjusts the temperature of the reaction kettle. The temperature sensor 10 real-time monitors the temperature value inside the reaction kettle to improve the temperature control accuracy; if the temperature inside the kettle body is lower than the set experimental temperature, the electric heating element heats up; if the temperature inside the kettle body is greater than or equal to the set experimental temperature, the electric heating element stops heating; In this application, the model of the temperature sensor is PT100 temperature sensor, and the pressure sensor is a resistance strain type sensor; An air inlet pipe A11 and an air outlet pipe A12 are provided on the connecting cylinder 403, and the air inlet pipe A11 is connected to the air outlet pipe B303 of the gas boosting system 3; An intake pipe B301 and an intake pipe C302 are provided on the gas boosting system 3. The intake pipe B301 is connected to the outlet pipe C101 of the CO2 gas tank 1, and the intake pipe C302 is connected to the outlet pipe D201 of the air compressor 2; the outlet pipe B303 of the gas boosting system 3 is connected to the intake pipe A11 of the reaction kettle; during use, the outlet pipe C101 of the CO2 gas tank 1 is connected to the intake pipe B301 of the gas boosting system 3, so that CO2 gas enters the gas storage tank of the gas boosting system 3; the outlet pipe D201 of the air compressor 2 is connected to the intake pipe C302 of the gas boosting system 3, so that the driving device in the gas boosting system 3 generates a driving force, thereby boosting the CO2 gas in the gas storage tank. The boosted CO2 gas enters the reaction kettle through the intake pipe A11 on the connecting cylinder 403 to control the pressure of the reaction kettle; A valve A13 is provided on the intake pipe A11, and a valve B14 is provided on the outlet pipe A12; a steam trap 15 is connected to the outlet pipe A12, and the gas outlet of the steam trap 15 is connected to the CO2 recovery tank 16; when it is necessary to relieve the pressure of the reaction kettle, the valve B14 is started, and after the discharged gas is processed by the steam trap 15, the CO2 gas enters the recovery tank 16 and the water is discharged; A base 17 is provided below the reaction kettle, and a telescopic support rod is provided on the base 17. The top end of the telescopic support rod is slidably connected to the bottom surface of the reaction kettle; 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 in the figure) is provided on the first rod 1801, and a through hole B (not shown in the figure) is provided on the second rod 1802; when the telescopic support rod reaches the designated position, a pin shaft 19 is used to pass through the corresponding through hole A and through hole B to realize the height positioning of the telescopic support rod; An annular chute 20 is provided on the bottom surface of the reaction kettle, and a ball 21 is provided at 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 is in contact with the bottom surface of the reaction kettle; A bearing 22 is sleeved outside 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 surface of the connecting plate 23; in this embodiment, the telescopic device 24 is an electric push rod; A gantry 25 is provided on the connecting plate 23. The bottom end of the gantry 25 is connected to the connecting plate 23. A motor 26 is provided on the cross beam 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 works, it can drive the reaction kettle to rotate; During the rotation of the reaction kettle, the telescopic support rod can support the reaction kettle and make it more stable during the rotation; On the inner side surface of the kettle body 401, there are two wavy liquid guide plates 27, and the liquid guide plates 27 are inclined; the two liquid guide plates 27 are arranged on the opposite inner walls of the kettle body 401; Such as Figure 1 , when the reaction kettle rotates clockwise, the liquid guide plate 27 is inclined in a state of being higher on the left and lower on the right; The liquid guide plate 27 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; For the inclined liquid guide plate 27, the distance between its bottom end and the inner bottom surface of the kettle body 401 becomes smaller. Therefore, when rotating with the kettle body 401, the flow velocity of the liquid passing through the gap between the bottom end of the liquid guide plate 27 and the inner bottom surface of the kettle body 401 changes greatly, so that the fluid near the bottom of the rock sample can also better participate in the erosion process, improving the uniformity of the reaction; and because no mechanical stirring structure is added inside the kettle body 401, physical damage to the sample can be avoided, improving the accuracy of subsequent detection results; Start the telescopic device and remove the pin shaft 19 to adjust the height of the reaction kettle. When the reaction kettle is lifted and rotated simultaneously, the flow direction of the solution inside the reaction kettle can be further changed, improving the uniformity of the reaction.

[0023] Example 2 The usage method of the high-temperature and high-pressure CO2-water-rock interaction experimental device provided in Example 1 is as follows: (1) Connect the outlet pipe C101 of the CO2 gas 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 reaction kettle; (2) Open the head 6, place the rock sample and water required for the experiment into the reaction kettle, and use the buckle 7 and the buckle block 8 to lock the head 6 and the connecting cylinder 403; In this experiment, the sample is a basalt sample, and the sample particles are processed to 0.3 - 0.35 mm. The water sample in this time is uniformly a Wahaha pure water sample; (3) Connect the power supplies of the air compressor 2, the temperature display, and the pressure display; set the temperature, start the electric heating element 5, and make the temperature inside the reaction kettle reach the required temperature for the experiment; (4) Open the CO2 gas tank 1 and the air compressor 2 to fill the gas tank of the gas boosting system 3 with gas; (5) After the gas boosting system 3 is filled with gas, close the CO2 gas tank 1 inlet switch and the air compressor 2 inlet switch of the gas boosting system 3, open the energy storage pressure switch and the gas output switch of the gas boosting system 3, and fill the reaction kettle with CO2 gas, and adjust it to the rated pressure; control the entry and exit of CO2 gas through the valve A13 and the valve B14 to keep the reaction proceeding under the rated temperature and pressure; After the reaction is completed, the pressure in the reactor is relieved, and the CO2 gas is collected. 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 testing institution for testing and analysis, and the experiment ends. Although the present invention has been described in detail by referring to the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A high-temperature and high-pressure CO2-water-rock interaction experimental device, characterized in that, It includes a CO2 gas cylinder, an air compressor, a gas boosting system and a reaction kettle; The reaction kettle includes a kettle body, and a sealing cover is provided on the kettle body; A connecting cylinder is provided on the sealing cover, a head is provided on the connecting cylinder, and the head is detachably connected to the connecting cylinder; An air inlet pipe A and an air outlet pipe A are provided on the connecting cylinder, 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 kettle body, and the output shaft of the motor is connected to the top surface of the head; when the motor works, it can drive the reaction kettle to rotate; A wavy liquid guide plate is provided on the inner side surface of the kettle body, and the liquid guide plate is inclined; 2. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, characterized in that, The air outlet pipe C of the CO2 gas cylinder is connected to the air inlet pipe B of the gas boosting system, and the air outlet pipe D of the air compressor is connected to the air 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 cylinder, a latch block is provided on the head, and the buckle and the latch block are used in cooperation; a pressure sensor and a temperature sensor are provided on the 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 of a double-layer structure, and an electric heating element is provided 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 a CO2 recovery tank; 6. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, wherein The liquid guide plate is a silica gel plate; 7. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 1, wherein A base is provided below the reaction kettle, a telescopic support rod is provided on the base, and the top end of the telescopic support rod is slidably connected to the bottom surface of the reaction kettle; a gantry is provided on the base, and the motor is located on the gantry; 8. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 7, characterized in that, The telescopic support rod includes a first rod and a second rod, and the first rod is sleeved outside 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 designated position, a pin shaft is used to pass through the corresponding through holes A and B; 9. The high-temperature and high-pressure CO2-water-rock interaction experimental device according to claim 8, characterized in that, A bearing is sleeved outside 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 ends of the telescopic devices are 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; 10. A method for using the experimental device for high-temperature and high-pressure CO2-water-rock interaction as described in claim 1, characterized in that, The process is as follows: (1) Connect the CO2 gas cylinder, the air compressor, the gas boosting system and the reaction kettle; (2) Open the head, put the rock samples and water required for the experiment into the reaction kettle, and use the buckle and the latch block to lock the head and the connecting cylinder; (3) Connect the reaction kettle to the power supply and start the electric heating element to make the temperature in the reaction kettle reach the temperature required for the experiment; (4) Open the CO2 gas cylinder and the air compressor to pump air into the gas tank of the gas boosting system; (5) After the gas boosting system is inflated, close the CO2 gas cylinder inlet switch and the air compressor inlet switch of the gas boosting system, open the energy storage pressure switch and the gas output switch of the gas boosting system, and fill the reaction kettle 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 proceeding under the rated temperature and pressure; (6) After the reaction is completed, release the pressure of the reaction kettle, collect the CO2 gas, take out the rock samples, and the experiment ends.

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