Gas storage skid-mounted device and use method

Abstract

The invention relates to the technical field of gas storage and transportation, and discloses a gas storage skid-mounted device which is characterized in that a gas inlet is formed in a reaction tank, and a gas inlet valve is arranged on the gas inlet; one end of the water inlet pipe is communicated with a water source, and the other end of the water inlet pipe is communicated with the reaction tank; the pressure regulating valve is arranged on the reaction tank; the graphite plate is arranged in the reaction tank, the graphite plate is of a hollow structure, the graphite plate is filled with graphite powder wrapped by a composite membrane, and a plurality of through holes are formed in the graphite plate; the temperature control structure is provided with an output end, the output end of the temperature control structure is connected with the reaction tank, and the temperature control structure is used for adjusting the temperature in the reaction tank. The device has the advantages that water and gas are promoted to generate micro-nano bubble hydrate by generating pressure fluctuation, so that the gas exists in the form of gas hydrate, excessive gas decomposition is avoided, and the storage rate of the gas can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas storage and transportation, and in particular to a gas storage skid-mounted device and a method of use. Background Art

[0002] Gas storage skids are integrated devices typically used to store and process gases such as natural gas and hydrogen. These devices offer advantages such as a small footprint, easy installation, and flexible mobility, making them widely used in various fields, including the petrochemical industry, the natural gas industry, and the environmental protection industry. Existing gas hydrate-based gas storage technologies show strong competitive potential in areas such as natural gas storage, hydrogen storage, carbon dioxide capture, and gas separation. Due to their self-protection properties, they enable long-term, stable storage under mild conditions.

[0003] Existing gas storage skids typically utilize low-temperature, high-pressure tanks made of high-pressure, low-temperature resistant materials, such as stainless steel. These tanks are insulated with layers of insulation, such as polyurethane foam, to reduce heat transfer. However, some gases, such as carbon dioxide, are prone to decomposition. During storage and transportation, carbon dioxide hydrates can decompose if the temperature rises or the pressure drops. This decomposition can lead to carbon dioxide gas leakage, resulting in not only a waste of resources but also potential environmental and safety threats. Furthermore, this decomposition can result in a low storage efficiency.

[0004] In summary, there is a need for a gas storage skid-mounted device that avoids excessive gas decomposition and improves gas storage efficiency. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a gas storage skid-mounted device and a method of use, which can avoid excessive gas decomposition and improve the gas storage rate.

[0006] The present invention provides a gas storage skid-mounted device, comprising: Reaction tank, used to store gas; a water inlet assembly having an output end, the output end of the water inlet assembly being in communication with the reaction tank, and the water inlet assembly being used to supply water into the reaction tank; A pressure regulating assembly is provided on the reaction tank and is used to regulate the air pressure in the reaction tank so as to generate pressure fluctuations in the reaction tank to promote the formation of micro-nano bubble hydrates from water and gas; A graphite plate is disposed in the reaction tank, the graphite plate being a hollow structure with a plurality of through holes formed thereon, the plurality of through holes being used for gas and water to enter the hollow structure, the hollow structure being filled with graphite powder wrapped by a composite film, the graphite powder being used for adsorbing micro-nano bubble hydrates; A temperature control structure is provided on the reaction tank, and is used to adjust the temperature inside the reaction tank.

[0007] Preferably, a plurality of graphite plates are provided, the plurality of graphite plates are arranged at intervals in the reaction tank, and the plurality of graphite plates are all arranged horizontally.

[0008] Preferably, the composite membrane is an ultrafiltration membrane made of polysulfone and polyethylene glycol.

[0009] Preferably, the plurality of through holes are provided on the graphite plate in a rectangular array.

[0010] Preferably, the water inlet assembly comprises: a water inlet pipe, one end of which is connected to the reaction tank; A water pump, the output end of which is connected to the other end of the water inlet pipe, and the input end of the water pump is used to connect to a water source.

[0011] Preferably, the voltage regulating component includes: An air intake valve is provided on the reaction tank, and is used to charge the reaction tank with air; A pressure regulating valve is provided on the reaction tank and is used to reduce the pressure of the reaction tank.

[0012] Preferably, the temperature control structure includes: a temperature sensor, disposed in the reaction tank, and configured to obtain a temperature signal in the reaction tank; a controller, electrically connected to the temperature sensor, wherein the temperature sensor sends a temperature change signal to the controller; A refrigeration component is electrically connected to the controller, the refrigeration component has an output end, the output end of the refrigeration component is connected to the reaction tank, and the refrigeration component is used to cool the reaction tank.

[0013] A method for using a gas storage skid-mounted device, using the gas storage skid-mounted device, comprises the following steps: The temperature sensor detects the temperature inside the reaction tank, which is the initial temperature value; Introducing a fixed amount of water into the reaction tank through the water inlet assembly; The reaction tank is pressurized by introducing gas into the gas inlet valve to a pressure greater than the equilibrium pressure of the gas hydrate, which is the initial pressure value. This process is the first pressurization to the initial pressure value; After a preset time, a liquid-solid interface is generated in the reaction tank, and the pressure in the reaction tank is reduced by the pressure regulating valve, so that the gas pressure in the reaction tank drops to the target pressure value for gas hydrate formation, thereby generating micro-nano bubbles in the gas solution phase; The reaction tank is pressurized to the initial pressure value through the air inlet valve. This process is the second pressurization to the initial pressure value. At the same time, the temperature inside the reaction tank is cooled by the refrigeration component so that the temperature inside the reaction tank drops to the initial temperature value, completing the generation of gas hydrates.

[0014] Preferably, the difference between the initial pressure value and the equilibrium pressure of the gas hydrate is 2 MPa to 13 MPa.

[0015] Compared with the prior art, the present invention discloses a gas storage skid-mounted device and a method of use, which has the following beneficial effects: When storing gas, this device introduces gas and water into the reaction tank, and stores the gas by regulating the temperature and pressure of the reaction tank to generate gas hydrates in the reaction tank, thereby avoiding excessive gas decomposition and leakage, which would reduce the gas storage efficiency. At the same time, in order to further store the generated gas hydrates, this device arranges a graphite plate in the reaction tank. The gas hydrates can adhere to the side walls of the graphite plate and enter the cavity of the graphite plate through the through holes and adhere to the pores between the graphite powder particles. That is, the graphite plate filled with graphite powder particles effectively increases the storage capacity of gas hydrates per unit volume in the reaction tank, thereby improving the gas storage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 A top view of the graphite plate of the present invention; Figure 3 A diagram showing the process of gas hydrate formation at the liquid-solid interface on the graphite plate of the present invention; Figure 4 This is a graph showing the pressure inside the reaction tank changing with time at the initial pressure value during the experiment using the present invention; Figure 5 This is a graph showing the change of pressure in the reaction tank over time when the pressure is reduced by 0.5 MPa during the experiment using the present invention; Figure 6 This is a graph showing the change of pressure in the reaction tank over time when the pressure is reduced by 1 MPa during the experiment using the present invention; Figure 7 This is a graph showing the change of pressure in the reaction tank over time when the pressure is reduced by 3 MPa during the experiment using the present invention; Figure 8This is a graph showing the change in CO2 consumption over time at the initial pressure value during the experiment using the present invention; Figure 9 This is a graph showing the change in CO2 consumption over time when the pressure is reduced by 0.5 MPa during the experiment using the present invention; Figure 10 This is a graph showing the change in CO2 consumption over time when the pressure is reduced by 1 MPa during the experiment using the present invention; Figure 11 This is a graph showing the change in CO2 consumption over time when the pressure is reduced by 3 MPa during the experiment using the present invention; Figure 12 The graph is a graph showing the change in CO2 consumption with generation temperature during the experiment using the present invention.

[0018] The meaning of each number in the figure: 1—water inlet pipe, 2—graphite plate, 21—through hole, 3—drain valve, 4—inlet valve, 5—exhaust valve, 6—reaction tank, 7—pressure regulating valve, 8—temperature control structure. DETAILED DESCRIPTION

[0019] A specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the technical solution of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.

[0022] Additionally, in the description of the present invention, "plurality" refers to two or more than two. The terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0023] Example 1 The embodiment of the present invention provides a gas storage skid mounted device such as Figure 1 As shown, it includes: a reaction tank 6, a water inlet pipe 1, a pressure regulating valve 7, a graphite plate 2, and a temperature control structure 8. The reaction tank 6 serves as a container for storing gas. An air inlet and an air outlet are provided on the reaction tank 6. The air inlet is provided with an air inlet valve 4, and the air outlet is provided with an air exhaust valve 5. Air can be introduced into and out of the reaction tank 6 through the air inlet valve 4 and the air exhaust valve 5. One end of the water inlet pipe 1 is used to connect to a water source, and the other end of the water inlet pipe 1 is connected to the reaction tank 6. The water inlet pipe 1 is used to introduce a water source into the reaction tank 6, that is, water for the reaction to generate gas hydrates. The pressure regulating valve 7 is provided on the reaction tank 6. The pressure regulating valve 7 can regulate the air pressure in the reaction tank 6. The pressure regulating valve 7 has a pressure gauge that can monitor the air pressure in the reaction tank 6, thereby accurately regulating the air pressure in the reaction tank 6. The pressure regulating valve 7 and the air inlet valve 4 constitute a pressure regulating assembly. The pressure regulating component can regulate the air pressure in the reaction tank 6, so that pressure fluctuations are generated in the reaction tank 6 to promote the generation of micro-nano bubble hydrates by water and gas; the graphite plate 2 is made of graphite material, and the graphite material has a certain adsorption capacity, which can store the generated gas hydrates to avoid gas decomposition and reduce the gas storage rate. The graphite plate 2 is fixed in the reaction tank 6, and the graphite plate 2 is arranged horizontally. The graphite plate 2 is a hollow structure, that is, there is a cavity inside. The cavity of the graphite plate 2 is filled with graphite powder wrapped by a composite film. The composite film and graphite powder are laid flat in the cavity. There are pores between the graphite powder particles. The pores can be used to further store gas hydrates and increase the storage area. The graphite powder particle size , tap density , the use of a composite membrane to wrap the graphite powder is to prevent the graphite powder from spreading. The composite membrane is PSF-B-PEG. PSF-B-PEG is a block copolymer composed of two parts: polysulfone (PSf) and polyethylene glycol (PEG). PSf-b-PEG can be synthesized with different PEG contents and used to manufacture ultrafiltration membranes with high permeability selectivity and anti-fouling properties. The pore structure of this membrane is very dense and sponge-like, with abundant interconnected pores, which gives it excellent mechanical strength. This membrane exhibits very high water permeability, which facilitates the entry of gas hydrates. The pure water permeability of the composite membrane material in this embodiment is , under pressure of 1MPa, membrane flux The graphite plate 2 is provided with a plurality of through holes 21, which facilitate the entry of gas hydrates into the cavity through the through holes 21; the temperature control structure 8 has an output end, and the output end of the temperature control structure 8 is connected to the reaction tank 6. The temperature control structure 8 is used to adjust the temperature in the reaction tank 6. In this embodiment, the temperature control structure 8 uses a temperature sensor (such as a thermistor, a thermocouple, etc.) to monitor the ambient temperature and controls the heating or cooling equipment through program control, thereby realizing automatic temperature adjustment and control. A simple temperature controller consists of three parts: a temperature sensor, a controller, and an actuator, which can be implemented using an existing temperature controller. When storing gas, the present device introduces gas and water into the reaction tank 6, and stores the gas by regulating the temperature and pressure of the reaction tank 6 to generate gas hydrates in the reaction tank 6, thereby preventing excessive gas decomposition and leakage, which would reduce the gas storage efficiency. At the same time, in order to further store the generated gas hydrates, the present device arranges a graphite plate 2 in the reaction tank 6. The gas hydrates can adhere to the side walls of the graphite plate 2 and enter the cavity of the graphite plate 2 through the through hole 21 and adhere to the pores between the graphite powder particles. That is, the graphite plate 2 filled with graphite powder particles effectively increases the storage capacity of gas hydrates per unit volume in the reaction tank 6, thereby improving the gas storage rate.

[0024] Furthermore, the reaction tank 6 is provided with a drain valve 3 , which can discharge the gas and liquid in the reaction tank 6 and is mainly used when cleaning the reaction tank 6 and replacing the graphite plate 2 .

[0025] Furthermore, multiple graphite plates 2 are provided, and the multiple graphite plates 2 are arranged at intervals in the reaction tank 6, and the multiple graphite plates 2 are all arranged horizontally in the reaction tank 6. By arranging multiple graphite plates 2, the amount of stored gas hydrates can be further increased. The intervals between two adjacent graphite plates 2 facilitate the gas hydrates to enter the pores between the graphite powder particles in the cavity through the through hole 21. The specific spacing between the two graphite plates 2 is determined according to actual experimental conditions, the size of the reaction tank 6, etc.

[0026] Example 2 An embodiment of the present invention provides a method for using a gas storage skid-mounted device, comprising the following steps: Step 1: The temperature sensor detects the temperature inside the reaction tank 6, which is the initial temperature value; Step 2: Introduce the water source into the reaction tank 6 through the water inlet pipe 1. Specifically, a water pump can be connected between the water inlet pipe 1 and the water source to pump the water source into the reaction tank 6 through the water pump; Step 3: Intake gas into the reaction tank 6 through the intake valve 4 to pressurize the reaction tank to a pressure greater than the equilibrium pressure of the gas hydrate. This pressure is the initial pressure value. This process is the first pressurization to the initial pressure value. The difference between the initial pressure value and the equilibrium pressure of the gas hydrate is 2MPa~13MPa. The equilibrium pressure of the gas hydrate refers to the pressure required for the system to reach an equilibrium state when the gas hydrate is formed or decomposed at a specific temperature. The equilibrium pressure of the gas hydrate is a key parameter for its formation and stability. The initial pressure value of the intake pressure should be slightly greater than the equilibrium pressure of the gas hydrate to be generated, about 2MPa~13MPa higher. During the period of inflation, the gas (such as carbon dioxide) is solid under the high-pressure environment, and the solid gas and liquid water can form a liquid-solid interface; Step 4: The pressure in the reaction tank 6 is reduced by a pressure regulating valve 7 according to a certain pressure gradient value (for example, but not limited to 0.1, 0.2, 0.3, 0.4, 0.5 MPa / min) to the target pressure value for gas hydrate formation (the target pressure value varies according to experimental adjustment and gas type), thereby simultaneously generating liquid-solid interface and micro-nano hydrate bubbles in the gas solution phase, such as Figure 3 As shown, the reaction tank 6 is first pressurized, and the gas to be stored enters the reaction tank 6. The gas penetrates the composite membrane and enters the surface of the graphite powder particles, forming partial hydrates on the surface and the surface of the graphite plate 2. At the same time, the gas is solid under high pressure, and the solid gas forms a liquid-solid interface with the liquid water, generating bubbles at this liquid-solid interface. After a period of time, the pressure in the reaction tank 6 is reduced. After the pressure reduction, the gas hydrates decompose. During the hydrate decomposition process, the gas escapes from the solid hydrate lattice and enters the surrounding liquid water or gas phase. Since the liquid-solid interface is the area where the hydrates and liquid water are in contact, the decomposed gas easily forms micro-nano bubble hydrates (micro-nano bubble hydrates encapsulate gas) at this interface when escaping. The bubbles form bubbles with hydrate films on the surface of the graphite plate 2 and the surface of the graphite powder particles wrapped by the composite membrane. This embodiment uses the pressure fluctuation method to induce the formation of micro-nano bubble hydrates. The promotion effect of the liquid-solid interface reduces the use of chemical inhibitors, making the technology low-cost and environmentally friendly, meeting environmental protection requirements. Step 5: The reaction tank 6 is pressurized to the initial pressure value through the air inlet valve 4. The initial pressure value is the pressure value in the second step. This process is the second pressurization to the initial pressure value. After a period of time after the pressure is reduced, the reaction tank 6 is pressurized again. The hydrate formation conditions are met again in the reaction tank 6. Liquid water combines with gas, solid gas hydrates grow again, and the liquid-solid interface gradually disappears, eventually forming a uniform solid hydrate phase. By reducing the decomposition of hydrates to produce micro-nano bubbles, the micro-nano bubbles are re-pressurized to make the carbon dioxide hydrate become solid, thereby increasing the amount of gas hydrate generated. , improving the gas storage rate, and the micro-nano bubbles will induce the formation of hydrates, so that the formation rate will also increase; at the same time, the temperature in the reaction tank 6 is regulated by the temperature control structure 8, and the reaction tank 6 is cooled to the initial temperature value (because the reaction of gas and water will increase the temperature, so this step requires cooling the reaction tank 6), completing the rapid formation of gas hydrates, and the gas hydrates are solid after cooling and pressurization. Solid hydrates are easier to store. The initial temperature (target temperature for gas hydrate formation) depends on the specific gas type, experimental conditions, etc. For example: the target temperature for carbon dioxide hydrate formation at an initial pressure value of 5.5 MPa is 5.65, and the target temperature is adjusted according to the different gas hydrates generated.

[0027] Example 3 As a further improvement on Example 2, the gas storage rate is reflected by calculating the gas consumption during the gas hydrate formation period, thereby reflecting the storage rate of the gas storage skid. The greater the gas consumption, the greater the amount of gas hydrate formation and the higher the gas storage rate. This embodiment is an algorithm for calculating gas consumption, which can calculate the gas consumption at any time during the gas hydrate formation period and reflect the gas storage rate based on the consumption. Furthermore, the method for calculating the gas consumption during the gas hydrate formation period includes:

[0028] (9); In formula (9), is the gas consumption during the formation of gas hydrate, in mol; The gas pressure in the reaction tank 6 when it is first charged to the initial pressure value, in MPa; is the gas pressure in the reaction tank 6 at time t (any time in the experiment), in MPa; The volume of gas in the reaction tank 6 when it is first charged to the initial pressure value, in ml; is the volume of gas in the reaction tank 6 at time t, in ml; The temperature inside the reaction tank 6 when the pressure is first charged to the initial pressure value can be detected by the temperature sensor in the temperature control structure 8, and the unit is K; is the temperature inside the reaction tank 6 at time t, which can also be detected by the temperature sensor and the unit is K; and is the compression coefficient, which can be solved by the PR state equation, which is a commonly used calculation method in this field; is the universal gas constant, a proportionality constant in the ideal gas equation of state; (10); Among them, in formula (10) is the volume of the reaction tank 6, in ml; is the volume of water introduced into the reaction tank 6 from the water inlet pipe 1, in ml; is the volume of the formed hydrate, in L; The volume of the impeller in the pump body (the pump body refers to the air pump. When the air inlet valve 4 is opened, the gas is pumped into the reaction tank 6 through the air pump. In this embodiment, the air inlet valve 4 and the pump body are integrated together) in the air inlet valve 4, in cm 3 ; is the amount of water involved in the formation of gas hydrates at time t in the experiment, in L; (11); In formula (11), The hydration number refers to the average number of water molecules bound around a solute molecule in an aqueous solution. The hydration number is determined based on the type of gas hydrate formed. is the molar volume of liquid water, in L / mol.

[0029] Furthermore, in formula (11), The calculation methods include: (12); In formula (12), is the proportion of the first cavity in the crystal lattice of the crystal water in the reaction tank 6; is the proportion of the second cavity in the crystal lattice of the crystalline water in the reaction tank 6; the volume of the first cavity is greater than that of the second cavity. The crystalline H2O can be divided into pieces of lattices. The cavities in the lattice are of different sizes and can be roughly divided into large cavities and small cavities. The first cavity represents the carbon dioxide captured by the large cavities in the lattice (there are many cavities, but only a few cavities can capture carbon dioxide). The more cavities are captured, the faster and better the hydrate is generated. The second cavity represents the small cavities in the lattice.

[0030] Furthermore, in formula (11), The calculation methods include: (13); In formula (13), is the temperature inside the reaction tank 6 at time t during the experiment, in K.

[0031] Furthermore, in formula (10), The calculation methods include: (14); In formula (14), is the molar volume of the empty hydrate lattice of gas hydrate. The empty hydrate lattice refers to the state in which only water molecules exist in the hydrate to form a cage structure, and the cage is not occupied by gas molecules or other small molecules. In this case, the hydrate lattice structure is still intact, but the cage is empty. The unit is L / mol.

[0032] Furthermore, in formula (14), The calculation methods include: (15); In formula (15), is Avogadro's number; is the temperature in the reaction tank (6) after the reaction is completed, in K; is the gas pressure in the reaction tank 6 at time t during the experiment, in MPa.

[0033] Furthermore, in the formula (12), or The calculation methods include: (16); In formula (16), for or , The subscripts in change depending on whether the large or small cavity fraction is being calculated. Here is a general formula for the large and small cavity fractions. is the exhalation rate of gas in the gas phase, which can be calculated by computer program. For example, when the temperature of carbon dioxide is 2.2℃, is 0.87871460 or 0.8978408, when the temperature of carbon dioxide is 4.2℃, 4.4℃, and 4.8℃ respectively. They are 0.87183000, 0.88142548, and 0.8557840 respectively, is a specific value. When calculating different gas hydrates and temperatures, you can substitute the specific Perform calculations; is the Langmuir constant of the gas; (17); In formula (17), exp represents the natural exponential function, that is, the power of e, represents an exponential decay term, which increases with increasing temperature. hour, , When calculating hour, , ; is the temperature inside the reaction tank 6 after the reaction is completed, in K. A is the temperature inside the reaction tank during the reaction at standard atmospheric pressure, and B is the constant temperature. The specific values of A and B are given when calculating the ratio of large and small cavities. Based on the known values and the values measured in the experiment, the gas consumption during gas hydrate formation can be calculated using the above formula. This consumption can reflect the gas storage rate. A higher gas consumption indicates a greater amount of gas hydrate formation and a higher gas storage rate.

[0034] Among them, the other structures of this embodiment are consistent with those of Example 2, and are just optimizations made to Example 2.

[0035] Taking the generation of carbon dioxide hydrate as an example, the experiment was conducted under the conditions that the temperature in the reaction tank 6 was 2.5°C and the initial pressure was 5.5 MPa when the pressure was first charged to the initial pressure value. Figure 4 and Figure 8 Correspondingly, both are static tests, that is, the pressure change curves and CO2 consumption change curves with time when the pressure in the reaction tank 6 is the initial pressure value. Figures 5 to 7 The pressure inside the reaction tank 6 changes with time when the pressure inside the reaction tank 6 is reduced by 0.5MPa, 1MPa, and 3MPa after 10,000 seconds. Correspondingly, Figures 9-11 The graphs are respectively the CO2 consumption changing with time when the pressure in the reaction tank 6 is reduced by 0.5MPa, 1MPa and 3MPa after 10000 seconds. Figures 4 to 11 It can be concluded that the pressure is reduced after a period of reaction, and the amount of pressure reduction affects the amount of carbon dioxide hydrate produced. From these experimental curves, when the pressure is reduced by 3MPa, the amount of hydrate produced is greater (but the pressure should not be reduced too much. After the pressure is reduced, the pressure value after rebound must be higher than 1MPa, so that hydrate can continue to be produced).

[0036] At the same time, the CO2 gas consumption at five different temperatures was measured under the condition of an initial pressure of 3.0 MPa. The experimental results are as follows: Figure 12As shown in the table below, as the temperature decreases, the CO2 consumption increases from 0.092 mol to 0.232 mol. It can be seen that the molar mass of the formed CO2 hydrate decreases with increasing temperature.

[0037] The advantage of the present invention is that when storing gas, the device introduces gas and water into the reaction tank, and by adjusting the temperature and pressure of the reaction tank, gas hydrates are generated in the reaction tank to store the gas, thereby avoiding excessive gas decomposition and leakage, and reducing the gas storage efficiency. At the same time, in order to further store the generated gas hydrates, the device arranges a graphite plate in the reaction tank. The gas hydrates can adhere to the side wall of the graphite plate and enter the cavity of the graphite plate through the through hole and adhere to the pores between the graphite powder particles. That is, the graphite plate filled with graphite powder particles effectively increases the storage amount of gas hydrates per unit volume in the reaction tank, thereby improving the gas storage rate.

[0038] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A gas storage skid-mounted device, characterized in that: include: A reaction tank (6) for storing gas; A water inlet assembly having an output end, the output end of the water inlet assembly being in communication with the reaction tank (6), and the water inlet assembly being used to feed water into the reaction tank (6); A pressure regulating component is provided on the reaction tank (6) and is used to regulate the air pressure in the reaction tank (6) so as to generate pressure fluctuations in the reaction tank (6) to promote the formation of micro-nano bubble hydrates from water and gas; A graphite plate (2) is arranged in the reaction tank (6), the graphite plate (2) is a hollow structure, a plurality of through holes (21) are opened on the graphite plate (2), the plurality of through holes (21) are used for gas and water to enter the hollow structure, the hollow structure is filled with graphite powder wrapped by a composite film, and the graphite powder is used to adsorb micro-nano bubble hydrates; A temperature control structure (8) is provided on the reaction tank (6), and the temperature control structure (8) is used to adjust the temperature inside the reaction tank (6).

2. A gas storage skid-mounted device according to claim 1, characterized in that: A plurality of graphite plates (2) are provided, and the plurality of graphite plates (2) are arranged at intervals in the reaction tank (6), and the plurality of graphite plates (2) are all arranged horizontally.

3. A gas storage skid-mounted device according to claim 1, characterized in that: The composite membrane is an ultrafiltration membrane made of polysulfone and polyethylene glycol.

4. A gas storage skid-mounted device according to claim 1, characterized in that: The plurality of through holes (21) are arranged in a rectangular array on the graphite plate (2).

5. The gas storage skid-mounted device according to claim 1, characterized in that: The water inlet assembly comprises: A water inlet pipe (1), one end of which is connected to the reaction tank (6); A water pump, the output end of which is connected to the other end of the water inlet pipe (1), and the input end of the water pump is used to connect to a water source.

6. A gas storage skid-mounted device according to claim 1, characterized in that: The voltage regulating component comprises: An air intake valve (4) is provided on the reaction tank (6), and the air intake valve (4) is used to charge the reaction tank (6) with air; A pressure regulating valve (7) is provided on the reaction tank (6), and the pressure regulating valve (7) is used to reduce the pressure of the reaction tank (6).

7. A gas storage skid-mounted device according to claim 6, characterized in that: The temperature control structure (8) includes: A temperature sensor is provided in the reaction tank (6), and the temperature sensor is used to obtain a temperature signal in the reaction tank (6); a controller, electrically connected to the temperature sensor, wherein the temperature sensor sends a temperature change signal to the controller; A refrigeration component is electrically connected to the controller, the refrigeration component has an output end, the output end of the refrigeration component is connected to the reaction tank (6), and the refrigeration component is used to cool the reaction tank (6).

8. A method for using a gas storage skid-mounted device, using the gas storage skid-mounted device according to claim 7, characterized in that: The following steps are involved: The temperature sensor detects the temperature inside the reaction tank (6), which is the initial temperature value; Introducing a fixed amount of water into the reaction tank (6) through the water inlet assembly; Injecting air into the reaction tank (6) through the air inlet valve (4) to pressurize the reaction tank to a pressure greater than the equilibrium pressure of the gas hydrate, which is the initial pressure value. This process is the first pressurization to the initial pressure value; After a preset time, a liquid-solid interface is generated in the reaction tank (6), and the pressure in the reaction tank (6) is reduced by the pressure regulating valve (7), so that the gas pressure in the reaction tank (6) is reduced to a target pressure value for gas hydrate formation, thereby generating micro-nano bubbles in the gas solution phase; The reaction tank (6) is pressurized to an initial pressure value by introducing air into the reaction tank (6) through the air inlet valve (4). This process is the second pressurization to the initial pressure value. At the same time, the temperature inside the reaction tank (6) is cooled by the refrigeration component, so that the temperature inside the reaction tank (6) is reduced to the initial temperature value, thereby completing the generation of gas hydrates.

9. The method for using a gas storage skid-mounted device according to claim 8, characterized in that: The difference between the initial pressure value and the equilibrium pressure of the gas hydrate is 2MPa~13MPa.

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