A polythermodynamic promoter for hydrate sequestration of carbon dioxide and its use

Abstract

The application relates to a hydrate carbon dioxide storage polythermodynamic promoter and application thereof, which comprises sodium glycinate (NaGly), a surfactant octyl glucoside (OGP), a thermodynamic promoter tetrabutylammonium bromide (TBAB) and an organic solvent tetrahydrofuran (THF), and the mass percentage concentration of the four mixed with water is as follows: NaGly: 0.001-1 wt%, OGP: 0.001-1 wt%, TBAB: 5-50 wt%, and THF: 4-40 wt%. In the application, NaGly can improve the stability of the hydrate, OGP can improve the generation rate of the hydrate, TBAB can improve the speed and efficiency of the hydrate formation, and THF can promote the rapid generation of the hydrate. The synergy of the four can significantly accelerate the generation speed of the hydrate, shorten the generation time and effectively improve the carbon dioxide storage efficiency.

Description

TECHNICAL FIELD

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

[0002] In recent years, the "greenhouse effect" has become a social hot issue, and it 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, and if it is directly discharged, it will pollute the environment, 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 hydrates. The promotion of a single surfactant to hydrate growth is relatively limited, which is specifically manifested in the following defects:

[0004] 1. Harsh thermodynamic conditions: The main manifestation is that the production pressure of hydrate is high without a thermodynamic promoter, which leads to high experimental cost and high industrial energy consumption;

[0005] 2. Hydrate stability problem: Although studies have shown that CO2 hydrate has 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;

[0006] 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.

[0007] 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

[0008] The purpose of the present application is to provide a multi-thermodynamic hydrate promoter for carbon dioxide sequestration, 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 hydrate promoter.

[0009] The application is implemented as follows: a hydrate carbon dioxide storage polythermodynamic promoter, including sodium glycinate (NaGly), surfactant octyl glucoside (OGP), thermodynamic promoter tetrabutylammonium bromide (TBAB) and organic solvent tetrahydrofuran (THF), 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 %.

[0010] Further, the mass percentage concentration of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB) and tetrahydrofuran (THF) after mixing with water is 0.001wt %, 0.001wt %, 5wt % and 4wt % respectively. Compared with the control group (4MPa, >300min), the hydrate generation time is faster, the generation pressure and induction time are lower (1.56MPa, 205min).

[0011] Further, the mass percentage concentration of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB) and tetrahydrofuran (THF) after mixing with water is 0.001wt %, 0.001wt %, 5wt % and 4wt % respectively. Compared with the control group (4MPa, >300min), the hydrate generation time is faster, the generation pressure and induction time are lower (1.56MPa, 205min).

[0012] Further, the mass percentage concentration of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB) and tetrahydrofuran (THF) after mixing with water is 0.001wt %, 0.001wt %, 5wt % and 4wt % respectively. Compared with the control group (4MPa, >300min), the hydrate generation time is faster, the generation pressure and induction time are lower (1.56MPa, 205min).

[0013] An experimental device for determining polytropic thermodynamic promoters, comprising a thermostat device with a cavity, a high-pressure reactor for hydration reaction is arranged in the thermostat device, an observation window is arranged on the surface of the high-pressure reactor, the cavity in the high-pressure reactor is communicated with the lower part of a buffer tank arranged on the upper side of the high-pressure reactor, 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 communicated with the cavity in the high-pressure reactor, 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 reactor is communicated with a gas outlet pipeline, and the lower part of the cavity in the high-pressure reactor is communicated with a liquid inlet and outlet pipeline; a magnetic stirrer is arranged at the bottom of the high-pressure reactor, and the stirring end of the magnetic stirrer extends into the cavity in the high-pressure reactor; 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.

[0014] Application of a polytropic thermodynamic promoter for hydrate sealing of carbon dioxide, comprising the following steps:

[0015] S1. Injecting the polytropic thermodynamic promoter and an experimental solution into the high-pressure reactor from the liquid inlet and outlet pipeline, then closing the control valve at the gas storage bottle, the control valve at the liquid inlet and outlet pipeline and the control valve on the gas outlet pipeline, and then opening the vacuum pump to remove the gas in the high-pressure reactor and the pipelines, and the vacuumizing time is 30 min;

[0016] S2. Controlling the temperature of the thermostat device to keep the temperature in the high-pressure reactor stable, then opening the control valve at the gas storage bottle, closing the control valve at the vacuum pump, introducing CO2 gas into the high-pressure reactor, pressurizing the high-pressure reactor with the hand pump, stopping the gas introduction when the set pressure is reached, and starting the magnetic stirrer below the high-pressure reactor when the temperature in the high-pressure reactor drops to the set temperature, and starting the timing, and when the CO2 hydrate crystal nucleus appears in the observation window, the required time is the induction time of the CO2 hydrate;

[0017] S3. When the temperature and pressure in the high-pressure reactor remain unchanged, it is considered that the CO2 hydrate is completely generated, the control valve on the gas outlet pipeline is opened, the gas discharge speed is controlled (5-7 seconds for 0.01 Mpa pressure drop), the temperature in the high-pressure reactor is kept constant, the temperature and pressure data are transmitted to the data recording and display device through the temperature sensor and the first pressure sensor and the second pressure sensor, the temperature and pressure values in the decomposition process of the CO2 hydrate are recorded, and the balance point of the CO2 sealing by the hydrate method is found by observing the observation window;

[0018] S4. After opening the exhaust valve, the hydrate begins to decompose, and when a bright spot appears in the observation window, record the phase equilibrium data at this time, that is, the equilibrium point of the hydrate method for storing CO2.

[0019] Further, in step S2, the temperature in the high-pressure reaction kettle is 2-10℃, the specific pressure is 3-5 Mpa, and the magnetic stirrer in the high-pressure reaction kettle works at a speed of 500 revolutions per minute.

[0020] As the above technical solutions are implemented, the application uses a multi-thermodynamic promoter of NaGly (0.001-1wt %) + OGP (0.001-1wt %) + TBAB (5-50wt %) + THF (4-40wt %). NaGly is an amino acid salt that promotes the formation of hydrates by changing the properties of the liquid and improves the stability of the hydrates. OGP acts as a kinetic promoter for generating hydrates, which promotes the formation of hydrates by changing the properties of the liquid and improves the generation rate of the hydrates. TBAB acts as an additive, which further accelerates the generation process of the hydrates by adjusting the properties of the reaction medium, changes the physical and chemical properties of the reaction system, and improves the speed and efficiency of the hydrate formation. THF optimizes the physical and chemical properties of the solution, which promotes the rapid generation of hydrates, changes the structure of the aqueous solution, and makes it easier for carbon dioxide to be wrapped into hydrates. Beneficial effects: the synergistic effect of the four significantly accelerates the generation speed of the hydrates and improves the efficiency of carbon dioxide storage. Under the action of the above multi-thermodynamic promoter, the generation rate of the hydrates is improved, the generation time is shortened, and the efficiency of carbon dioxide storage is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The specific structure of the application is given by the following drawings and examples:

[0022] Figure 1 is a structural schematic diagram of the experimental device of the application.

[0023] Legend: 1. Gas cylinder, 2. Vacuum pump, 3. Gas inlet pipeline, 4. Piston, 5. Buffer tank, 6. Thermostat, 7. Exhaust pipeline, 8. First pressure sensor, 9. Hand pump, 10. Pressurizing pipeline, 11. Inlet and outlet liquid pipeline, 12. High-pressure reaction kettle, 13. Magnetic stirrer, 14. Observation window, 15. Temperature sensor, 16. Second pressure sensor. DETAILED DESCRIPTION

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0025] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0026] Embodiment: A hydrate storage carbon dioxide polythermal promoter, including sodium glycinate (NaGly), surfactant octyl glucoside (OGP), thermodynamic promoter tetrabutylammonium bromide (TBAB) and organic solvent tetrahydrofuran (THF), 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 %.

[0027] Further, the mass percentage concentrations of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB) and tetrahydrofuran (THF) after mixing with water are 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).

[0028] Further, the mass percentage concentrations of sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB) and tetrahydrofuran (THF) after mixing with water are 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).

[0029] 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).

[0030] As shown in Figure 1 An experimental device for determining polythermal dynamic promoters, comprising a thermostatic device 6 with a cavity, a high-pressure reaction kettle 12 for hydrating reaction is arranged in the thermostatic device 6, an observation window 14 is arranged on the surface of the high-pressure reaction kettle 12, the cavity in the high-pressure reaction kettle 12 is in communication with the lower part of a buffer tank 5 arranged on the upper side of the high-pressure reaction kettle 12, a piston 4 is arranged in the buffer tank 5, the cavity above the piston 4 is connected with a hand pump 9 through a pressurizing pipeline 10, the cavity below the piston 4 is in communication with the cavity in the high-pressure reaction kettle 12, the cavity below the piston 4 is connected with a storage cylinder 1 and a vacuum pump 2 in parallel through an air inlet pipeline 3, the upper part of the cavity in the high-pressure reaction kettle 12 is in communication with an exhaust pipeline 7, and the lower part of the cavity in the high-pressure reaction kettle 12 is in communication with an inlet and outlet liquid pipeline 11.

[0031] Further, a magnetic stirrer 13 is arranged at the bottom of the high-pressure reaction kettle 12, and a stirring end of the magnetic stirrer 13 extends into the cavity in the high-pressure reaction kettle 12. The magnetic stirrer 13 is used for uniform mixing of gas and liquid phases and strengthening of mass transfer in the kettle, and the speed thereof can be adjusted. It is prior art and is not the point of the present application, and the specific structure will not be described in detail.

[0032] Further, the thermostatic device 6 is prior art and is not the point of the present application, and the specific structure will not be described in detail. A second pressure sensor 16 and a temperature sensor 15 are arranged in the thermostatic device 6, and the second pressure sensor 16 and the temperature sensor 15 are connected with a data recording and display device circuit arranged outside the thermostatic device 6.

[0033] Further, a first pressure sensor 8 is arranged at the pressurizing cavity of the hand pump 9, and the first pressure sensor 8 is connected with the data recording and display device circuit arranged outside the thermostatic device 6.

[0034] The data recording and display device is used for recording the pressure and temperature data returned through the first pressure sensor 8, the second pressure sensor 16 and the temperature sensor 15. It is also prior art and is not the point of the present application, and the specific structure will not be described in detail.

[0035] Further, control valves are arranged at the air inlet pipeline 3, the exhaust pipeline 7, the inlet and outlet liquid pipeline 11 and the communication parts of the air inlet pipeline 3 with the storage cylinder 1 and the vacuum pump 2.

[0036] The application of a polythermodynamic promoter for hydrate storage of carbon dioxide includes the following steps:

[0037] S1. Inject the polythermodynamic promoter and experimental solution into the high-pressure reactor 12 from the inlet and outlet pipeline 11, then close the control valve at the gas cylinder 1, the control valve at the inlet and outlet pipeline 11, and the control valve at the exhaust pipeline 7, and then start the vacuum pump 2 to remove the gas in the high-pressure reactor 12 and the pipelines, and the vacuum time is 30 minutes.

[0038] S2. Control the temperature of the thermostat 6 to keep the temperature in the high-pressure reactor 12 stable, then open the control valve at the gas cylinder 1, close the control valve at the vacuum pump 2, and introduce CO2 gas into the high-pressure reactor 12, and then pressurize the high-pressure reactor 12 with the hand pump 9, stop the gas introduction when the set pressure is reached, and start the magnetic stirrer 13 below the high-pressure reactor 12 when the temperature in the high-pressure reactor 12 drops to the set temperature, and start timing, and when the CO2 hydrate is generated, visible CO2 hydrate crystal nuclei appear in the observation window 14, and the required time is the induction time of the CO2 hydrate.

[0039] S3. When the temperature and pressure in the high-pressure reactor 12 remain unchanged, it is considered that the CO2 hydrate is completely generated, the control valve at the exhaust pipeline 7 is opened, the exhaust speed is controlled (5-7 seconds for a pressure drop of 0.01 Mpa), the temperature in the high-pressure reactor 12 is kept constant, the temperature and pressure data are transmitted to the data recording and display device through the temperature sensor 15 and the first pressure sensor 8 and the second pressure sensor 16, the temperature and pressure values of the CO2 hydrate during the decomposition process are recorded, and the hydrate storage of CO2 is found by observing the observation window 14.

[0040] S4. After the exhaust valve is opened, the hydrate begins to decompose, and when obvious bright spots appear in the observation window 14, the phase equilibrium data at this time, i.e., the equilibrium point of the hydrate storage of CO2, is recorded.

[0041] Further, the experimental solution refers to a mixture of one or more of deionized water, NaCl, calcium chloride, sodium sulfate, etc., which is used for simulation.

[0042] Further, in step S2, the temperature in the high-pressure reactor 12 is 2-10℃, the specific pressure is 3-5 Mpa, and the speed of the magnetic stirrer 13 is 500 revolutions per minute when it is working.

[0043] Further, in step S1, the reactor is cleaned: the control valves at the vacuum pump 2 and the gas inlet pipeline 3 are opened, the control valves at the liquid inlet and outlet pipeline 11 and the gas outlet pipeline 7 are closed, the vacuum pump 2 is started to perform vacuumizing operation on the high-pressure reactor 12, then the control valves at the vacuum pump 2 and the gas inlet pipeline 3 are closed, the control valve at the liquid inlet and outlet pipeline 11 is opened to suck in 80 ml of deionized water, the magnetic stirrer 13 is started to clean the high-pressure reactor 12 for 3-4 times, and the cleaned deionized water is discharged from the liquid inlet and outlet pipeline 11; then the control valves at the vacuum pump 2 and the gas inlet pipeline 3 are opened again, the control valve at the liquid inlet and outlet pipeline 11 is closed, the vacuum pump 2 is used to vacuumize the high-pressure reactor 12, the control valves at the vacuum pump 2 and the gas inlet pipeline 3 are closed, the control valve at the liquid inlet and outlet pipeline 11 is opened to suck in the multi-component thermodynamic promoter of the present application for 1-2 times, and the washed multi-component thermodynamic promoter is discharged from the liquid inlet and outlet pipeline 11; finally, 50 ml of the multi-component thermodynamic promoter and the experimental solution in a volume ratio of 1:25 are injected into the high-pressure reactor 12.

[0044] Further, in step S2, the gas is introduced: the experimental gas (CO2) is introduced from the gas cylinder 1 into the high-pressure reactor 12, each pipeline is purged for 3-4 times, the residual air in the high-pressure reactor 12 is completely discharged, the preset generated pressure is set to A, the experimental gas is introduced and the pressure in the high-pressure reactor 12 is stopped when the pressure reaches 70% of the estimated value A, the valve at the gas inlet pipeline 3 is closed, the magnetic stirrer 13 is opened, and the rotating speed is adjusted to 500 r / min.

[0045] Further, in step S2, the reaction is started: the temperature in the thermostat 6 required by the experiment is set, and after the temperature in the high-pressure reactor 12 reaches the target value and is constant, the hydrate formation at the gas-liquid interface of the observation window 14 of the high-pressure reactor 12 is observed.

[0046] Further, in step S2, the pressure is increased: the hand pump 9 is pushed to slowly increase the pressure in the high-pressure reactor 12, and the pressure values corresponding to different scales are recorded during the process, and the pressure is increased about every 2 min, and each time the pressure is increased by about 5% of the estimated value A (i.e. 5%A). If the hydrate does not continue to form, the pressure in the high-pressure reactor 12 is continuously increased by pushing the hand pump 9.

[0047] Further, in step S2, hydrate formation: If hydrate forms, the pressure indication will significantly decrease. Note that when the pressure starts to significantly drop or the temperature significantly rises, the pump pushing should be immediately stopped. If a large amount of hydrates are observed to form, immediately reduce the pressure in the high-pressure reactor 12 by means of the hand pump 9 until trace hydrates remain at the interface and the pressure is maintained 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 reduced to 96% of C (if the pressure of 96%C has been proven unable to form hydrates before, adjust to a relatively larger value), and let the pressure value at this time be D.

[0048] 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 hydrates completely disappear, and E is equivalent to the calibrated pressure corresponding to the pump pushing when no hydrates form, it means that the hydrates are completely decomposed. D and E are less than the hydrate formation pressure. Redefine A = min{E + 0.06 MPa, 1.05E}, and restart the experiment from the beginning of hydrate formation; if E > D, but the hydrates still exist, continue to observe; if D > E and D - E > min{0.05E, 0.05 MPa}, then redefine A = E, and restart the experiment from the start of the reaction after the hydrates are completely decomposed. When 0 < D - E < min{0.05E, 0.05 MPa}, continue to observe.

[0049] 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:

[0050]

[0051] The above shows the application effects of 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.

[0052] Further, in step S2, the hydrate formation pressure is determined, and after waiting for three hours, if the hydrate completely disappears and the final pressure reading is equivalent to the scale pressure when the pump is pushed without hydrate formation, it is determined that the hydrate is completely dissolved, and the pressure reading at this time is defined as F, and A is redefined as min{F+0.03 MPa, 1.025 F}, and the experiment is restarted from the start of the reaction; and if there is still a small amount of hydrate at this time, the pressure F is the hydrate formation pressure under this condition, and the industrial sealing of the hydrate can be attempted at this pressure.

[0053] The thermostatic device 6 in the present application is a thermostatic air bath, and the temperature range is 253.15 K to 323.15 K. A temperature sensor 15 (Pt100) is arranged in the high-pressure reaction kettle 12 to measure the internal temperature of the high-pressure reaction kettle 12, and the measurement accuracy is ±0.1 K. The pressure value is measured in real time by the first pressure sensor 8 and the second pressure sensor 16, and the measurement range is 0-20 MPa, and the measurement accuracy is ±0.01 MPa. In the experiment, an analytical balance CPA225D (the weighing accuracy is 0.01 g) is used to weigh the solution. In the present application, NaGly, OGP, TBAB and THF are combined in the above-mentioned proportions to form a multi-component thermodynamic promoter. NaGly is an amino acid salt that promotes the formation of hydrate by changing the liquid properties and improves the stability of the hydrate. OGP is a kinetic promoter for forming hydrate, which promotes the formation of hydrate by changing the liquid properties and improves the hydrate formation rate. TBAB is an additive that further accelerates the hydrate formation process by adjusting the properties of the reaction medium, changes the physical and chemical properties of the reaction system, and improves the speed and efficiency of hydrate formation. THF optimizes the physical and chemical properties of the solution, THF promotes the rapid formation of hydrate, changes the structure of the aqueous solution, and makes it easier for carbon dioxide to be wrapped to form hydrate. The synergistic effect of the four significantly accelerates the hydrate formation rate and improves the carbon dioxide sealing efficiency. Especially when the concentration of TBAB is higher than that of THF, the hydrate preferentially forms TBAB half-cage hydrate, and at this time, the growth rate of the hydrate is the slowest, which not only meets the requirements of improving the hydrate formation rate and shortening the generation time, but also prevents pipeline blockage, making the hydrate method of sealing CO2 more valuable for industrial applications.

[0054] The above technical features constitute an embodiment of the present application, which has strong adaptability and implementation effect. Non-essential technical features can be added or subtracted 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: It includes 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 after mixing with water are as follows: NaGly: 0.001 - 1 wt%, OGP: 0.001 - 1 wt%, TBAB: 5 - 50 wt%, 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 glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and tetrahydrofuran (THF) after mixing with water are 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) after mixing with water are 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) after mixing with water are 1 wt%, 1 wt%, 50 wt%, and 40 wt% respectively.

5. The application of a multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 1, characterized in that: It includes the following steps: S1. Inject the multiple-component thermodynamic promoter for carbon dioxide hydrate storage and the experimental solution into the high-pressure reactor from the inlet and outlet pipelines. Then close the control valves at the gas storage bottle, the control valves at the inlet and outlet pipelines, and the control valve on the exhaust pipeline. Next, turn on the vacuum pump to evacuate the gas in the high-pressure reactor and each pipeline. The vacuum time is 30 min. 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 bottle, 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 admitting gas 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 the CO2 hydrate forms, when visible CO2 hydrate nuclei appear in the observation window, the required time is the induction time of the CO2 hydrate. 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 min, and each pressurization value is 5% of the estimated value A. If the hydrate does not form continuously, continuously increase the pressure in the high-pressure reactor by pushing the hand pump forward. If the hydrate forms, the pressure indication will decrease significantly. Immediately stop pushing the pump when the pressure starts to drop significantly or the temperature rises significantly. If a large amount of hydrate is observed to form, immediately reduce the pressure in the high-pressure reactor by the hand pump 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 can be observed be C. At this time, if A ≤ C, adjust the hand pump to make the pressure reach the estimated value A. If C < A, then adjust the hand pump to reduce the pressure to 96% of C, and let the pressure value at this time be D. Wait for 1 hour. If the pressure is stable after 1 hour and remains stable for more than 20 minutes, let the pressure at this time be E. If E = D at this time, 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 calibrated pressure corresponding to the pump when no hydrate is formed, 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 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}, redefine A = E, and start the experiment again after the hydrate has completely decomposed. When 0 < D - E < min{0.05E, 0.05 MPa}, continue to observe. After waiting for three hours, if the hydrate has completely disappeared and the final pressure reading is equivalent to the calibrated pressure corresponding to the pump when no hydrate is formed, it means that the hydrate has completely decomposed. Define the pressure reading at this time as F, redefine A = min{F + 0.03 MPa, 1.025F}, and 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. S3. After the temperature and pressure in the high-pressure reactor remain unchanged, it can be considered that the CO2 hydrate is completely formed. Open the control valve on the exhaust pipeline, control the exhaust speed, keep the temperature in the high-pressure reactor constant, and 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 of the CO2 hydrate during the decomposition process, and find the equilibrium point of CO2 sequestration by the hydrate method through 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.

6. The application of a multi-component thermodynamic promoter for carbon dioxide hydrate sequestration as described in claim 5, characterized in that: The experimental solution refers to a mixture of one or more of deionized water, NaCl, calcium chloride, and sodium sulfate.

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