Multi-element thermodynamic accelerant for sealing carbon dioxide by hydrate and application of multi-element thermodynamic accelerant

Abstract

The invention relates to a multi-element thermodynamic accelerant for sealing carbon dioxide by hydrate and application of the multi-element thermodynamic accelerant, the multi-element thermodynamic accelerant comprises sodium glycinate (NaGly), octyl glucoside (OGP) serving as a surfactant, tetrabutylammonium bromide (TBAB) serving as a thermodynamic accelerant and tetrahydrofuran (THF) serving as an organic solvent, and after the sodium glycinate (NaGly), the octyl glucoside (OGP) serving as a surfactant, the tetrabutylammonium bromide (TBAB) and the tetrahydrofuran (THF) are mixed with water, the mass percent concentration of the NaGly is 0.001-1wt%, the mass percent concentration of the OGP is 0.001-1wt%, the mass percent concentration of the TBAB is 5-50wt%, and the mass percent concentration of the THF is 4-40wt%. NaGly can improve the stability of the hydrate, OGP can improve the generation rate of the hydrate, TBAB can improve the formation speed and efficiency of the hydrate, THF can promote rapid generation of the hydrate, the generation speed of the hydrate is remarkably increased through cooperation of NaGly, OGP, TBAB and THF, the generation time is shortened, and the storage efficiency of carbon dioxide is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a hydrate promoter, in particular to a multi-thermodynamic promoter for hydrate sequestration of carbon dioxide and application thereof. BACKGROUND

[0002] In recent years, the "greenhouse effect" has become a social hot issue, which is also a global environmental problem. CO2 is one of the main gases causing the greenhouse effect. Coal combustion will produce a large amount of CO2, which will pollute the environment if directly discharged, so it needs to be sequestrated.

[0003] The core of the hydrate method for sequestrating CO2 is to capture and sequestrate CO2 by forming stable gas hydrate. The promotion of a single surfactant to hydrate growth is relatively limited, which is specifically manifested in the following defects: 1. Harsh thermodynamic conditions: The main manifestation is that the hydrate production pressure is high without a thermodynamic promoter, which leads to high experimental cost and high industrial energy consumption; 2. Hydrate stability problem: Although studies have shown that CO2 forms hydrate with high stability, its long-term stability still needs to be further verified. Especially in the actual application of hydrate method for sequestrating CO2, it is necessary to ensure that the CO2 hydrate can remain stable for a long time to avoid decomposition or leakage; 3. Slow conversion rate of kinetic process: The slow gas-liquid diffusion mass transfer process will affect the generation kinetics of CO2 hydrate in the sequestration process.

[0004] Based on the above reasons, it is necessary to study a multi-thermodynamic promoter which can solve the limitation of the promotion of a single surfactant to hydrate growth. SUMMARY

[0005] The purpose of the present application is to provide a multi-thermodynamic promoter for hydrate sequestration of carbon dioxide which can reduce the pressure required for hydration reaction and improve the hydration reaction rate and hydrate stability. On the basis of the previous purpose, another purpose of the present application is to provide the application of the multi-thermodynamic promoter.

[0006] The present application is realized as follows: a multi-thermodynamic promoter for hydrate sequestration of carbon dioxide, which comprises sodium glycinate (NaGly), surfactant octyl glucoside (OGP), thermodynamic promoter tetrabutylammonium bromide (TBAB) and organic solvent tetrahydrofuran (THF), and the mass percentage concentration of the four after mixing with water is NaGly: 0.001-1wt %, OGP: 0.001-1wt %, TBAB: 5-50wt %, THF: 4-40wt %.

[0007] Further, the mass percentage concentration of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutyl ammonium bromide (TBAB) and tetrahydrofuran (THF) mixed with water is 0.001wt%, 0.001wt%, 5wt% and 4wt% respectively. Compared with the control group (4MPa, >300min), the hydrate formation time is faster, the formation pressure and induction time are lower (1.56MPa, 205min).

[0008] Further, the mass percentage concentration of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutyl ammonium bromide (TBAB) and tetrahydrofuran (THF) mixed with water is 0.5wt%, 0.5wt%, 25wt% and 20wt% respectively. Compared with the control group (4MPa, >300min), the hydrate formation time is faster, the formation pressure and induction time are lower (1.18MPa, 67min).

[0009] Further, the mass percentage concentration of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutyl ammonium bromide (TBAB) and tetrahydrofuran (THF) mixed with water is 1wt%, 1wt%, 50wt% and 40wt% respectively. Compared with the control group (4MPa, >300min), the hydrate formation time is faster, the formation pressure and induction time are lower (0.82MPa, 18min).

[0010] An experimental device for determining polythermal dynamic promoters comprises a thermostat device with a cavity, a high-pressure reaction kettle for hydrating reaction is arranged in the thermostat device, an observation window is arranged on the surface of the high-pressure reaction kettle, the cavity in the high-pressure reaction kettle is in communication with the lower part of a buffer tank arranged on the upper side of the high-pressure reaction kettle, a piston is arranged in the buffer tank, the cavity above the piston is connected with a hand pump through a pressurizing pipeline, the cavity below the piston is in communication with the cavity in the high-pressure reaction kettle, the cavity below the piston is connected with a gas storage bottle and a vacuum pump in parallel through a gas inlet pipeline, the upper part of the cavity in the high-pressure reaction kettle is in communication with a gas discharge pipeline, and the lower part of the cavity in the high-pressure reaction kettle is in communication with a liquid inlet and outlet pipeline; a magnetic stirrer is arranged at the bottom of the high-pressure reaction kettle, and a stirring end of the magnetic stirrer extends into the cavity in the high-pressure reaction kettle; a first pressure sensor is arranged at the pressurizing cavity of the hand pump, a second pressure sensor and a temperature sensor are arranged in the thermostat device, and the first pressure sensor, the second pressure sensor and the temperature sensor are connected with a data recording and display device circuit arranged outside the thermostat device.

[0011] An application of a polythermal dynamic promoter for hydrate sealing carbon dioxide, comprising the following steps: S1. Inject the multi-component thermodynamic accelerator and experimental solution described in this application into the high-pressure reactor through the inlet and outlet liquid pipelines. Then close the control valve at the gas storage bottle, the control valve at the inlet and outlet liquid pipelines, and the control valve on the exhaust pipeline. Then turn on the vacuum pump to remove the gas from the high-pressure reactor and each pipeline. The vacuuming time is 30 minutes. S2. Control the temperature of the thermostat to maintain a stable temperature inside the high-pressure reactor. Then, open the control valve at the gas storage bottle and close the control valve at the vacuum pump to introduce CO2 gas into the high-pressure reactor. Use a hand pump to pressurize the high-pressure reactor until the set pressure is reached, then stop the gas intake. When the temperature inside the high-pressure reactor drops to the set temperature, turn on the magnetic stirrer at the bottom of the high-pressure reactor and start timing. As CO2 hydrates are formed, the time required for visible CO2 hydrate crystal nuclei to appear in the observation window is the induction time of CO2 hydrates. S3. Once the temperature and pressure in the high-pressure reactor remain constant, it can be considered that CO2 hydrate has been completely generated. Open the control valve on the exhaust pipe and control the exhaust speed (pressure drops by 0.01 MPa every 5-7 seconds) to maintain a constant temperature inside the high-pressure reactor. Transmit the temperature and pressure data to the data recording and display device through the temperature sensor, the first pressure sensor, and the second pressure sensor to record the temperature and pressure values ​​of CO2 hydrate during the decomposition process. Find the equilibrium point for CO2 hydrate sequestration by observing the observation window. S4. After opening the exhaust valve, the hydrate begins to decompose. When a bright spot appears in the observation window, record the phase equilibrium data at this time, which is the equilibrium point of CO2 sequestration by the hydrate method.

[0012] Furthermore, in step S2, the temperature inside the high-pressure reactor is 2℃~10℃, the specific pressure is 3~5 MPa, and the magnetic stirrer inside the high-pressure reactor rotates at 500 rpm.

[0013] Due to the implementation of the above technical solution, this application uses a multi-component thermodynamic promoter consisting of NaGly (0.001-1 wt%), OGP (0.001-1 wt%), TBAB (5-50 wt%), and THF (4-40 wt%). NaGly is an amino acid salt that promotes hydrate formation and improves hydrate stability by altering liquid properties. OGP, as a kinetic promoter for hydrate formation, also promotes hydrate formation and increases the hydrate formation rate by altering liquid properties. TBAB, as an additive, further accelerates the hydrate formation process by adjusting the properties of the reaction medium, changing the physicochemical properties of the reaction system, and improving the speed and efficiency of hydrate formation. THF optimizes the physicochemical properties of the solution, promoting rapid hydrate formation and altering the structure of the aqueous solution, making it easier for carbon dioxide to be encapsulated and form hydrates. Beneficial effects: The synergistic effect of the four significantly accelerates the formation rate of hydrates and improves the efficiency of carbon dioxide sequestration. Under the action of the above-mentioned multi-component thermodynamic promoters, the formation rate of hydrates is increased and the formation time is shortened, effectively improving the carbon dioxide sequestration efficiency. Attached Figure Description

[0014] The specific structure of this application is given by the following figures and embodiments: Figure 1 This is a schematic diagram of the experimental apparatus of this application.

[0015] Legend: 1. Gas storage cylinder, 2. Vacuum pump, 3. Inlet pipe, 4. Piston, 5. Buffer tank, 6. Thermostat, 7. Exhaust pipe, 8. First pressure sensor, 9. Hand pump, 10. Pressurization pipe, 11. Inlet and outlet pipes, 12. High-pressure reactor, 13. Magnetic stirrer, 14. Observation window, 15. Temperature sensor, 16. Second pressure sensor. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0018] Example: A multi-component thermodynamic promoter for carbon dioxide hydrate sequestration comprises sodium glycinate (NaGly), surfactant octyl glucoside (OGP), thermodynamic promoter tetrabutylammonium bromide (TBAB), and organic solvent tetrahydrofuran (THF). The mass percentage concentrations of the four components mixed with water are: NaGly: 0.001-1 wt%, OGP: 0.001-1 wt%, TBAB: 5-50 wt%, and THF: 4-40 wt%.

[0019] Furthermore, the mass percentage concentrations of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and tetrahydrofuran (THF) mixed with water were 0.001 wt%, 0.001 wt%, 5 wt%, and 4 wt%, respectively. Compared with the control group (4 MPa, >300 min), the hydrate formation time was faster, and the formation pressure and induction time were lower (1.56 MPa, 205 min).

[0020] Furthermore, the mass percentage concentrations of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and tetrahydrofuran (THF) mixed with water were 0.5 wt%, 0.5 wt%, 25 wt%, and 20 wt%, respectively. Compared with the control group (4 MPa, >300 min), the hydrate formation time was faster, and the formation pressure and induction time were lower (1.18 MPa, 67 min).

[0021] Furthermore, the mass percentage concentrations of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and tetrahydrofuran (THF) mixed with water were 1 wt%, 1 wt%, 50 wt%, and 40 wt%, respectively. Compared with the control group (4 MPa, >300 min), the hydrate formation time was faster, and the formation pressure and induction time were lower (0.82 MPa, 18 min).

[0022] like Figure 1As shown, an experimental apparatus for determining a multi-component thermodynamic accelerator includes a constant temperature device 6 with an internal cavity. A high-pressure reactor 12 for hydration reaction is installed inside the constant temperature device 6. An observation window 14 is provided on the surface of the high-pressure reactor 12. The internal cavity of the high-pressure reactor 12 is connected to the lower part of a buffer tank 5 located on the upper side of the high-pressure reactor 12. A piston 4 is installed inside the buffer tank 5. The cavity above the piston 4 is connected to a hand-cranked pump 9 through a pressurization pipe 10. The cavity below the piston 4 is connected to the internal cavity of the high-pressure reactor 12. The cavity below the piston 4 is connected to a parallel gas storage bottle 1 and a vacuum pump 2 through an air inlet pipe 3. The upper part of the internal cavity of the high-pressure reactor 12 is connected to an exhaust pipe 7. The lower part of the internal cavity of the high-pressure reactor 12 is connected to an inlet / outlet liquid pipe 11.

[0023] Furthermore, a magnetic stirrer 13 is provided at the bottom of the high-pressure reactor 12, with the stirring end of the magnetic stirrer 13 extending into the inner cavity of the high-pressure reactor 12. The magnetic stirrer 13 is used to uniformly mix the gas and liquid phases and enhance mass transfer within the reactor. Its speed is adjustable, which is existing technology and not the point of this invention. Therefore, its specific structure will not be described in detail.

[0024] Furthermore, the constant temperature device 6 is existing technology and is not the point of invention of this application. Its specific structure will not be described in detail. It is equipped with a second pressure sensor 16 and a temperature sensor 15. The second pressure sensor 16 and the temperature sensor 15 are connected to the data recording and display device circuit located outside the constant temperature device 6.

[0025] Furthermore, a first pressure sensor 8 is provided at the pressurization chamber of the hand pump 9, and the first pressure sensor 8 is connected to the data recording and display device circuit located outside the constant temperature device 6.

[0026] The data recording and display device is used to record pressure and temperature data transmitted through the first pressure sensor 8, the second pressure sensor 16 and the temperature sensor 15. This is also prior art and not the point of invention of this application. The specific structure is not described in detail.

[0027] Furthermore, control valves are installed on the air inlet pipe 3, the exhaust pipe 7, the liquid inlet / outlet pipe 11, and at the connection points between the air inlet pipe 3 and the gas storage cylinder 1 and the vacuum pump 2.

[0028] The application of a multi-component thermodynamic promoter for carbon dioxide hydrate sequestration includes the following steps: S1. Inject the multi-component thermodynamic accelerator and experimental solution described in this application into the high-pressure reactor 12 through the inlet / outlet liquid pipeline 11. Then close the control valve at the gas storage bottle 1, the control valve at the inlet / outlet liquid pipeline 11, and the control valve on the exhaust pipeline 7. Then turn on the vacuum pump 2 to remove the gas from the high-pressure reactor 12 and each pipeline. The vacuuming time is 30 minutes. S2. Control the temperature of the thermostat 6 to maintain a stable temperature inside the high-pressure reactor 12. Then, open the control valve at the gas storage bottle 1 and close the control valve at the vacuum pump 2 to introduce CO2 gas into the high-pressure reactor 12. Use the hand pump 9 to pressurize the high-pressure reactor 12. Stop the gas intake after reaching the set pressure. When the temperature inside the high-pressure reactor 12 drops to the set temperature, turn on the magnetic stirrer 13 below the high-pressure reactor 12 and start timing. As CO2 hydrates are generated, the time required for visible CO2 hydrate crystal nuclei to appear in the observation window 14 is the induction time of CO2 hydrates. S3. Once the temperature and pressure in the high-pressure reactor 12 remain constant, it can be considered that CO2 hydrate has been completely generated. Open the control valve on the exhaust pipe 7 to control the exhaust speed (pressure drops by 0.01 MPa every 5-7 seconds) and keep the temperature inside the high-pressure reactor 12 constant. Transmit the temperature and pressure data to the data recording and display device through the temperature sensor 15, the first pressure sensor 8, and the second pressure sensor 16 to record the temperature and pressure values ​​of CO2 hydrate during the decomposition process. Find the equilibrium point for CO2 hydrate sequestration by observing the observation window 14. S4. After opening the exhaust valve, the hydrate begins to decompose. When a bright spot appears in observation window 14, record the phase equilibrium data at this time, which is the equilibrium point of CO2 sequestration by the hydrate method.

[0029] Furthermore, the experimental solution refers to a mixture of one or more of the following components: deionized water, NaCl, calcium chloride, sodium sulfate, etc., used to simulate [the process].

[0030] Furthermore, in step S2, the temperature inside the high-pressure reactor 12 is 2℃~10℃, the specific pressure is 3~5Mpa, and the magnetic stirrer 13 operates at a speed of 500 rpm.

[0031] Further, in step S1, the reactor is cleaned: the control valves at vacuum pump 2 and inlet pipe 3 are opened, the control valves at inlet / outlet liquid pipe 11 and exhaust pipe 7 are closed, vacuum pump 2 is started to evacuate the high-pressure reactor 12, and then the control valves at vacuum pump 2 and inlet pipe 3 are closed, and the control valves at inlet / outlet liquid pipe 11 are opened to draw in 80... Add ml of deionized water, turn on the magnetic stirrer 13 to clean the high-pressure reactor 12 3-4 times, and discharge the cleaned deionized water through the inlet / outlet pipe 11; then open the control valves at the vacuum pump 2 and the air inlet pipe 3 again, close the control valves at the inlet / outlet pipe 11, use the vacuum pump 2 to evacuate the high-pressure reactor 12, close the control valves at the vacuum pump 2 and the air inlet pipe 3, open the control valves at the inlet / outlet pipe 11 to draw in the multi-component thermodynamic accelerator described in this application for rinsing 1-2 times, and discharge the rinsed multi-component thermodynamic accelerator through the inlet / outlet pipe 11; finally, inject a total of 50 ml of the multi-component thermodynamic accelerator and experimental solution described in this application into the high-pressure reactor 12 at a volume ratio of 1:25.

[0032] Furthermore, in step S2, the gas is introduced: the experimental gas (CO2) is introduced from the gas storage bottle 1 into the high-pressure reactor 12, and each pipeline is purged 3 to 4 times to completely remove the residual air in the high-pressure reactor 12. The preset generated pressure is A. When the experimental gas is introduced and the pressure in the high-pressure reactor 12 reaches 70% of the preset value A, the gas is introduced and the gas is stopped. The valve at the gas inlet pipeline 3 is closed, the magnetic stirrer 13 is turned on, and the speed is adjusted to 500 r / min.

[0033] Furthermore, in step S2, the reaction is started: the temperature inside the constant temperature device 6 required for the experiment is set, and after the temperature inside the high-pressure reactor 12 reaches the target value and becomes constant, the formation of hydrates at the gas-liquid interface is observed through the observation window 14 of the high-pressure reactor 12.

[0034] Furthermore, in step S2, pressurization is performed by pushing the hand pump 9 to slowly increase the pressure inside the high-pressure reactor 12. During this process, the pressure values ​​corresponding to different scales are recorded. Pressurization is performed approximately every 2 minutes, and each pressurization value is approximately 5% of the estimated value A (i.e., 5%A). If hydrate does not form, the pressure inside the high-pressure reactor 12 is continuously increased by pushing the hand pump 9 forward.

[0035] Further, in step S2, hydrate formation: If hydrate forms, the pressure indication will decrease significantly. Note that when the pressure starts to drop significantly or the temperature rises significantly, the pump pushing should be stopped immediately. If a large amount of hydrate is observed to form, immediately reduce the pressure in the high-pressure reactor 12 by means of the hand pump 9 until there is a trace amount of hydrate remaining at the interface and maintain the pressure constant. Let the pressure when a small amount of hydrate phenomenon can be observed be C. At this time, if A ≤ C, adjust the hand pump 9 to make the pressure reach the predicted value A; if C < A, then adjust the hand pump 9 to make the pressure reduce to 96% of C (if the pressure of 96%C has been proven unable to form hydrate before, adjust to a relatively larger value), and let the pressure value at this time be D.

[0036] Wait for 1 hour. After 1 hour, if the pressure is stable and stable for more than 20 minutes, let the pressure at this time be E. At this time, if E = D, then E is the hydrate formation pressure; if the pressure is still changing after 1 hour, wait until the pressure stops changing and remains stable for more than 20 minutes, and then let the stable pressure at this time be E. If E > D and the hydrate has completely disappeared, and E is equivalent to the scale pressure corresponding to the pump pushing when no hydrate forms, it means that the hydrate has completely decomposed. D and E are less than the hydrate formation pressure. Redefine A = min{E + 0.06 MPa, 1.05E}, and start the experiment again from the beginning of hydrate formation; if E > D, but the hydrate still exists, continue to observe; if D > E and D - E > min{0.05E, 0.05 MPa}, redefine A = E, and start the experiment again from the start of the reaction after the hydrate has completely decomposed. When 0 < D - E < min{0.05E, 0.05 MPa}, continue to observe.

[0037] To verify the effect of the multi-component thermodynamic promoter (TBAB > 0), the data under the conditions of no promoter and multi-component thermodynamic promoter were compared. The experiment was repeated three times and the average value was taken. The results are shown in the following table:

[0038] The above shows the application effects of the multi-component thermodynamic promoters NaGly, OGP, TBAB, and THF under different ratios. The experimental condition temperature was set at 5°C, and the stirring speed was 500 r / min. The experimental data show that the multi-component thermodynamic promoter can significantly reduce the CO2 hydrate formation pressure and shorten the induction time.

[0039] Furthermore, in step S2, the hydrate formation pressure is determined. After waiting for three hours, if the hydrate completely disappears and the final pressure reading is equivalent to the scale pressure corresponding to the pump push when no hydrate has formed, it indicates that the hydrate has been completely dissolved. The pressure reading at this time is defined as F, and A = min{F + 0.03 MPa, 1.025 F} is redefined. The experiment is repeated from the start of the reaction. If a small amount of hydrate still exists at this time, then the pressure F is the hydrate formation pressure under this condition, and the industrial-scale sealing of hydrate can be attempted at this pressure.

[0040] The constant temperature device 6 in this application is a constant temperature air bath with a temperature range of 253.15 K to 323.15 K. A temperature sensor 15 (Pt100) is installed inside the high-pressure reactor 12 to measure the internal temperature of the reactor 12, with a measurement accuracy of ±0.1 K. The pressure value is measured in real time by the first pressure sensor 8 and the second pressure sensor 16, with a measurement range of 0 to 20 MPa and a measurement accuracy of ±0.01 MPa. In this experiment, the solution was prepared using an analytical balance CPA225D (weighing accuracy of 0.01 g). This application combines NaGly, OGP, TBAB, and THF in the aforementioned ratio to form a multi-component thermodynamic promoter. NaGly is an amino acid salt that promotes hydrate formation and improves hydrate stability by changing the liquid properties. OGP, as a kinetic promoter for hydrate formation, promotes hydrate formation and improves the hydrate formation rate by changing the liquid properties. TBAB, as an additive, further accelerates the hydrate formation process by adjusting the properties of the reaction medium, altering the physicochemical properties of the reaction system, and improving the rate and efficiency of hydrate formation. THF optimizes the physicochemical properties of the solution, promoting rapid hydrate formation and altering the structure of the aqueous solution, making it easier for carbon dioxide to be encapsulated and form hydrates. The synergistic effect of these four agents significantly accelerates the hydrate formation rate and improves the efficiency of carbon dioxide sequestration. Under the action of these multi-component thermodynamic promoters, the hydrate formation rate is increased, the formation time is shortened, and the carbon dioxide sequestration efficiency is effectively improved. In particular, when the TBAB concentration is higher than the THF concentration, hydrates preferentially form TBAB semi-cage hydrates, at which point the hydrate growth rate is the slowest. This satisfies the requirements of increased hydrate formation rate and shortened formation time while helping to prevent pipeline blockage, making the hydrate method for CO2 sequestration more industrially valuable.

[0041] The above technical features constitute the embodiments of this application, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A multi-component thermodynamic promoter for carbon dioxide sequestration via hydrates, characterized in that: The mixture includes sodium glycine (NaGly), surfactant octyl glucoside (OGP), thermodynamic promoter tetrabutylammonium bromide (TBAB), and organic solvent tetrahydrofuran (THF). The mass percentage concentrations of the four components mixed with water are: NaGly: 0.001-1 wt%, OGP: 0.001-1 wt%, TBAB: 5-50 wt%, and THF: 4-40 wt%.

2. The multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 1, characterized in that: The mass percentage concentrations of sodium glycine (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and tetrahydrofuran (THF) mixed with water were 0.001 wt%, 0.001 wt%, 5 wt%, and 4 wt%, respectively.

3. The multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 1, characterized in that: The mass percentage concentrations of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and tetrahydrofuran (THF) mixed with water were 0.5 wt%, 0.5 wt%, 25 wt%, and 20 wt%, respectively.

4. The multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 1, characterized in that: The mass percentage concentrations of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and tetrahydrofuran (THF) mixed with water were 1 wt%, 1 wt%, 50 wt%, and 40 wt%, respectively.

5. An experimental apparatus for determining the properties of a multi-component thermodynamic accelerator as described in any one of claims 1-4, characterized in that: The device includes a temperature control system with an internal cavity. Inside the temperature control system is a high-pressure reactor for hydration reactions. The surface of the high-pressure reactor has an observation window. The internal cavity of the high-pressure reactor is connected to the lower part of a buffer tank located above the high-pressure reactor. A piston is installed inside the buffer tank. The cavity above the piston is connected to a hand-cranked pump via a pressurization pipe. The cavity below the piston is connected to the internal cavity of the high-pressure reactor. The cavity below the piston is connected to a parallel gas storage cylinder and a vacuum pump via an inlet pipe. The upper part of the internal cavity of the high-pressure reactor is connected to an exhaust pipe, and the lower part of the internal cavity of the high-pressure reactor is connected to inlet and outlet liquid pipes. A magnetic stirrer is installed at the bottom of the high-pressure reactor, with its stirring end extending into the internal cavity. A first pressure sensor is installed at the pressurization chamber of the hand-cranked pump. A second pressure sensor and a temperature sensor are installed inside the temperature control system. The first pressure sensor, second pressure sensor, and temperature sensor are connected to a data recording and display device circuit located outside the temperature control system.

6. The application of a multi-component thermodynamic promoter for carbon dioxide hydrate sequestration includes the following steps: S1. Inject the multi-component thermodynamic accelerator and experimental solution into the high-pressure reactor through the inlet and outlet liquid lines. Then close the control valves at the gas storage bottle, the inlet and outlet liquid lines, and the exhaust pipe. Then turn on the vacuum pump to remove the gas from the high-pressure reactor and each pipeline. The vacuuming time is 30 minutes. S2. Control the temperature of the constant temperature device to keep the temperature in the high-pressure reactor stable. Then, open the control valve at the gas storage cylinder and close the control valve at the vacuum pump, and introduce CO2 gas into the high-pressure reactor. Use a hand pump to pressurize the high-pressure reactor. Stop gas intake after reaching the set pressure. When the temperature in the high-pressure reactor drops to the set temperature, turn on the magnetic stirrer below the high-pressure reactor and start timing. As CO2 hydrate forms, when visible CO2 hydrate nuclei appear in the observation window, the time required is the induction time of CO2 hydrate; S3. After the temperature and pressure in the high-pressure reactor remain unchanged, it can be considered that CO2 hydrate is completely formed. Open the control valve on the exhaust pipeline, control the exhaust speed, and keep the temperature in the high-pressure reactor constant. Transmit the temperature and pressure data to the data recording and display device through the temperature sensor, the first pressure sensor, and the second pressure sensor. Record the temperature and pressure values during the decomposition process of CO2 hydrate, and find the equilibrium point of CO2 sequestration by the hydrate method by observing the observation window; S4. After opening the exhaust valve, the hydrate starts to decompose. When an obvious bright spot appears in the observation window, record the phase equilibrium data at this time, that is, the equilibrium point of CO2 sequestration by the hydrate method.

7. The application of the multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 6, characterized in that: In step S2, pressurization: Push the hand pump to slowly increase the pressure in the high-pressure reactor. During the process, record the corresponding pressure values at different scales. Pressurize every 2 minutes, and each pressurization value is 5% of the estimated value A. If the hydrate does not continue to form, continuously increase the pressure in the high-pressure reactor by pushing the hand pump forward.

8. The application of the multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 7, characterized in that: In step S2, hydrate formation: If the hydrate forms, the pressure indication will decrease significantly. When the pressure starts to decrease significantly or the temperature rises significantly, stop pushing the pump immediately; If a large amount of hydrate is observed to form, immediately reduce the pressure in the high-pressure reactor through the hand pump until there is a trace amount of hydrate remaining at the interface and maintain the pressure unchanged; Let the pressure when a small amount of hydrate phenomenon can be observed be C. At this time, if A ≤ C, adjust the hand pump to make the pressure reach the predicted value A; If C < A, then adjust the hand pump to make the pressure drop to 96% of C, and let the pressure value at this time be D.

9. The application of the multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 8, characterized in that: Wait for 1 hour. If the pressure is stable and stable for more than 20 minutes after 1 hour, let the pressure at this time be E. At this time, if E = D, then E is the hydrate formation pressure; If the pressure is still changing after 1 hour, wait until the pressure stops changing and remains stable for more than 20 minutes, and then let the stable pressure at this time be E. If E > D and the hydrate completely disappears, and E is equivalent to the scale pressure corresponding to pushing the pump when no hydrate is formed, it means that the hydrate is completely decomposed. D and E are less than the hydrate formation pressure. Redefine A = min{E + 0.06 MPa, 1.05E}, and conduct the experiment again; If E > D, but the hydrate still exists, continue to observe; If D > E and D - E > min{0.05E, 0.05 MPa}, then redefine A = E, and start the experiment again after the hydrate is completely decomposed; When 0 < D - E < min{0.05E, 0.05 MPa}, continue to observe; After waiting for three hours, if the hydrate completely disappears and the final pressure reading is equivalent to the calibrated pressure corresponding to the pump operation when no hydrate was formed, it indicates that the hydrate has completely decomposed. Define the pressure reading at this time as F, and redefine A = min{F + 0.03 MPa, 1.025F}, then conduct the experiment again; If there is still a small amount of hydrate at this time, then the pressure F is the hydrate formation pressure under this condition.

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