Reaction apparatus for hydrates, observation apparatus, and method of observing hydrates

Abstract

The application provides a reaction device for hydrate, which comprises a reaction bin and a sample mechanism arranged in the reaction bin, the sample mechanism comprises a pair of parallel sample tables, a first supporting plate and a second supporting plate for containing standard liquid and arranged on the two sample tables respectively, and a telescopic rod connected with the sample tables, wherein the second supporting plate is configured to move towards the first supporting plate under the action of the telescopic rod, so as to make the standard liquid form a liquid bridge between the first supporting plate and the second supporting plate. The overall size of the application is small, and the application focuses on indoor micro observation analysis, so that the physical mechanism of the hydrate phase transition mass transfer process under the influence of different interfaces can be studied. In addition, the application has the advantages of simple operation, short test time and high popularization value.

Description

Technical Field

[0001] This invention relates to the field of natural gas hydrate exploration and development, and specifically to a reaction apparatus for hydrates, an observation apparatus, and a method for observing the hydrate change process. Background Technology

[0002] In the exploration and development of natural gas hydrates, the hydrate reaction chamber is an important device for synthesizing, decomposing, and storing hydrates and conducting a series of tests.

[0003] Currently, hydrate reaction chambers are mainly isothermal and pressure-controlled devices designed for large-dose hydrate samples. Because indoor experiments require comparative analysis of mass transfer processes at solid-liquid, liquid-gas, and solid-liquid-gas three-phase interfaces to explore the physical processes of hydrate nucleation at different interfaces, it is necessary to construct experimental sample chambers capable of achieving hydrate formation at different interfaces and precise temperature control. Furthermore, experiments analyzing hydrate properties often require measuring and analyzing changes at specific sites within a certain temperature range for small or even trace amounts of hydrate.

[0004] CN109540763B discloses an apparatus and method for sample preparation and transfer in combined CT and SEM testing of hydrates, relating to the field of natural gas hydrate microscopic testing technology. The apparatus includes an environmental protection module, a gas supply and temperature control module, and a sample transfer module. The quick-opening movable sample protection device includes a cover and a detachable base and body. The size and shape of the base match the size and shape of the SEM sample stage groove, allowing the quick-opening movable sample protection device to be directly inserted into the SEM cryogenic transport system pretreatment chamber and the SEM sample stage. The size and shape of the body match the size and shape of the CT measurement chamber, allowing the body to be detached from the base and directly placed into the CT measurement chamber for CT scanning.

[0005] This method cannot observe and analyze the nucleation process in different interface regions, and the gas supply temperature control module can only achieve low-temperature isothermal control through external liquid nitrogen and temperature sensors, lacking flexible temperature adjustment. Furthermore, this method requires the entire sample storage device to be immersed in liquid nitrogen for temperature control, thus preventing point-to-point temperature adjustment of hydrate samples.

[0006] CN113092272B discloses a system for preparing and decomposing blocky natural gas hydrate samples, including a hydrate synthesis and pressing subsystem, a hydrate crushing, decomposition, and metering subsystem, and a pressure-holding transfer ball valve. The pressure-holding transfer ball valve is located between the hydrate synthesis and pressing subsystem and the hydrate crushing, decomposition, and metering subsystem, connecting the two subsystems to achieve integration of the hydrate sample synthesis and crushing / decomposition systems. This maximizes sample quality, reduces experimental interference factors, and, while possessing the ability to synthesize blocky hydrate samples, controls the density of the hydrate blocks. It simultaneously achieves pressure-holding transfer and rotary crushing of samples, ultimately enabling the acquisition of gas production characteristics of hydrate decomposition under different crushing fluidization processes. The split design is more scientific and reasonable, effectively preventing the hydrate blocks from expanding or decomposing due to pressure reduction. This provides effective data support for the research and development of seepage-type hydrate resource extraction processes and capacity prediction.

[0007] This method places the system in a temperature-controlled air bath for temperature control, which cannot achieve point-to-point temperature control of hydrate samples. Furthermore, the temperature control method used is relatively crude, with low temperature adjustment resolution. In addition, this method has limited application scenarios and poor portability, making it unsuitable for hydrate nucleation observation and analysis in confined spaces or interface regions.

[0008] Therefore, it is desirable to provide a reaction apparatus, an observation apparatus, and a method for observing the changes in hydrates in order to solve the above-mentioned technical problems. Summary of the Invention

[0009] The purpose of this invention is to provide a reaction apparatus for hydrates, which is adaptable to the physical observation and analysis of the nucleation and decomposition processes of hydrates in three regions: the solid-liquid interface, the liquid-gas interface, and the solid-liquid-gas interface. Furthermore, it possesses high innovation and design rationality because it can effectively adjust the liquid bridge (meniscus) through a polyimide membrane. In addition, an observation device and a method for observing the changes in hydrates are also proposed.

[0010] According to a first aspect of the present invention, a reaction apparatus for hydrates is provided, comprising a reaction chamber, and

[0011] The sample mechanism, located within the reaction chamber, includes a pair of parallel sample stages, a first support plate and a second support plate respectively mounted on the two sample stages for containing standard liquids, and a telescopic rod connected to the sample stages.

[0012] The second support plate is configured to move toward the first support plate under the action of the telescopic rod, so as to cause the standard liquid to form a liquid bridge between the first support plate and the second support plate.

[0013] In one embodiment, the reaction apparatus further includes a polyimide film disposed on the first support plate, a power source disposed outside the reaction chamber, and a plurality of wires disposed between the polyimide film and the power source.

[0014] In one embodiment, the first support plate is constructed as a silicon wafer or mica sheet in the form of a disk.

[0015] In one embodiment, a plurality of polyimide films are disposed at equal intervals along the circumferential and radial directions on the outer surface of the first support plate away from the second support plate.

[0016] In one embodiment, each of the wires is connected to one of the polyimide films.

[0017] In one embodiment, the reaction chamber is constructed as a sealed chamber made of a transparent material.

[0018] In one embodiment, the reaction apparatus further includes a pipeline for injecting experimental gas into the reaction chamber, and a sensor disposed on the pipeline for monitoring the gas pressure value inside the reaction chamber.

[0019] In one embodiment, the reaction apparatus further includes a separator for receiving fluid within the reaction chamber, and a gas-liquid recovery unit disposed at the free end of the separator.

[0020] According to a second aspect of the invention, an observation apparatus is provided, comprising a microscope observation stage and a reaction device disposed on the microscope observation stage according to the above description.

[0021] According to a third aspect of the present invention, a method for observing hydrate change processes using an observation device as described above is provided, comprising the following steps:

[0022] S1. Drip standard liquid into the first support plate and the second support plate respectively, and move the second support plate toward the first support plate by adjusting the telescopic rod, so as to cause the standard liquid to form a liquid bridge between the first support plate and the second support plate.

[0023] S2. Inject experimental gas into the reaction chamber through pipeline to observe the nucleation process of hydrates at the solid-liquid-gas three-phase interface;

[0024] S3. The temperature of the outer surface of the first support plate is adjusted by the polyimide membrane to observe the decomposition process of the hydrate at the solid-liquid-gas interface, and the decomposed fluid is discharged sequentially through the separator and the gas-liquid recovery unit.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] Firstly, this invention is suitable for physical observation and analysis of the nucleation and decomposition processes of hydrates in three regions: the solid-liquid interface, the liquid-gas interface, and the solid-liquid-gas interface. Furthermore, because it can effectively adjust the liquid bridge (meniscus) via a telescopic rod, it possesses high innovation and design rationality.

[0027] Secondly, since the polyimide film in this invention is distributed at multiple locations on the outer surface of the first support plate, the polyimide film has the ability to heat the first support plate at specific points, thereby ensuring that the liquid bridge between the first support plate and the second support plate can be decomposed at specific points. This allows for the collection of experimental data generated under various different conditions, further providing useful assistance for studying the hydrate change process.

[0028] Thirdly, this invention enables the polyimide film to have a temperature regulation capability of ±0.1℃ via a power source, thereby achieving flexible control of the temperature at specific points on the first support plate. Furthermore, since the temperature regulation range of the polyimide film is -40℃ to 200℃, the reaction apparatus used for hydrates can meet the needs of applications with space constraints or requiring contact with vacuum, oil, or chemical materials.

[0029] Fourth, the invention has a small overall size and focuses on indoor micro-scale observation and analysis, thereby enabling the study of the physical mechanism of hydrate phase change mass transfer process under the influence of different interfaces. This invention has the advantages of simple operation, short testing time, and high potential for widespread application. Attached Figure Description

[0030] The invention will now be described in detail with reference to the accompanying drawings, in which:

[0031] Figure 1 The schematic diagram illustrates the structure of a reaction apparatus for hydrates according to the present invention;

[0032] Figure 2 This is a side view of the first support plate in a hydrate reaction apparatus according to the present invention.

[0033] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0034] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0035] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

[0037] Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] The invention will now be further described with reference to the accompanying drawings.

[0039] Figure 1 The schematic diagram shows the structure of a reaction apparatus 100 for hydrates according to the present invention.

[0040] like Figure 1 As shown, according to a first aspect of the present invention, a reaction apparatus 100 for hydrates is provided, comprising a reaction chamber 1. Preferably, the reaction chamber 1 is constructed in a cuboid structure, and the reaction chamber 1 is a sealed chamber made of a transparent material. Thus, in subsequent observation, the nucleation and decomposition processes of hydrates in the three regions of the solid-liquid interface, the liquid-gas interface, and the solid-liquid-gas interface can be clearly observed using a microscope in a microscope observation stage (described below, not shown in the figures).

[0041] In a preferred embodiment, the transparent material is light-transmitting glass.

[0042] According to the present invention, such as Figure 1 As shown, the reaction apparatus 100 for hydrates also includes a sample mechanism disposed within the reaction chamber 1. Preferably, the sample mechanism includes a pair of parallel sample stages, a first support plate 21, and a second support plate 22. The first support plate 21 and the second support plate 22 are respectively mounted on the two sample stages, thereby facilitating subsequent adjustment of the second support plate 22.

[0043] In one embodiment, such as Figure 1As shown, the sample mechanism also includes a telescopic rod 23. Preferably, the telescopic rod 23 is installed on the sample stage where the second support plate 22 is located, so that the sample stage can be adjusted by the telescopic rod 23 to change the position of the second support plate 22 in the reaction chamber 1, thereby causing the standard liquid to form a liquid bridge 201 between the first support plate 21 and the second support plate 22, the details of which are described below.

[0044] In one specific embodiment, both the first support plate 21 and the second support plate 22 are capable of holding a standard liquid, which helps to form a liquid bridge 201 between the two support plates to facilitate observation of the nucleation and decomposition process of hydrates.

[0045] In a preferred embodiment, the standard liquid is experimental water.

[0046] According to a specific embodiment of the present invention, the second support plate 22 is configured to move toward the first support plate 21 under the action of the telescopic rod 23, so as to cause the standard liquid to form a liquid bridge 201 between the first support plate 21 and the second support plate 22, thereby helping to observe the nucleation and decomposition process of hydrates in the three regions of solid-liquid interface, liquid-gas interface and solid-liquid-gas interface.

[0047] In one specific embodiment, the liquid bridge 201 is configured as a curved liquid surface structure.

[0048] In one embodiment, the reaction apparatus 100 for hydrates further includes a polyimide membrane 31.

[0049] Figure 2 This is a side view of the first support plate 21 in the reaction apparatus 100 for hydrates according to the present invention.

[0050] like Figure 1 and 2 As shown, a polyimide film 31 is disposed on the first support plate 21. Preferably, the polyimide film 31 can fully heat the first support plate 21 under the action of the power supply 32 (described below), thereby promoting the decomposition of the nucleated hydrate, and thus enabling the decomposition process of the hydrate in the three regions of the solid-liquid interface, the liquid-gas interface, and the solid-liquid-gas interface to be observed through a microscope.

[0051] In one specific embodiment, such as Figure 2 As shown, a number of polyimide films 31 are equidistantly arranged along the circumferential and radial directions on the outer side 211 of the first support plate 21 away from the second support plate 22.

[0052] In this way, the polyimide film 31 can perform fixed-point temperature control and flexible control on the first support plate 21, thereby improving the resolution of temperature regulation and ensuring the refinement of temperature control.

[0053] Furthermore, observing the decomposition process of hydrates in the three regions of the solid-liquid interface, liquid-gas interface, and solid-liquid-gas interface through a microscope observation stage can be more accurate and can record data on hydrate decomposition under more conditions, thus providing useful assistance for studying the change process of hydrates.

[0054] In a preferred embodiment, the polyimide film 31 has a temperature range of -40°C to 200°C and can be adjusted by ±0.1°C, which makes it easier to meet the needs of applications with space constraints or those requiring contact with vacuum, oil or chemical materials, thereby improving the accuracy of the experimental process.

[0055] In one specific embodiment, the surface roughness of both the first support plate 21 and the second support plate 22 is less than 1 nm. Therefore, by reducing the surface roughness of the first support plate 21 and the second support plate 22, the influence of the contact angle hysteresis effect is effectively reduced, thereby improving the accuracy of the experimental process.

[0056] In one embodiment, the first support plate 21 is constructed as a silicon wafer or mica sheet in the form of a disk. In this way, the polyimide film 31 can be more uniformly distributed on the outer surface 211 of the first support plate 21, thereby ensuring the accuracy of temperature control in different areas of the first support plate 21, and further improving the diversity of hydrate decomposition processes observed through a microscope stage in the three regions of the solid-liquid interface, liquid-gas interface, and solid-liquid-gas interface.

[0057] Furthermore, since the surface of mica sheets is smoother, it is easier to reduce the effect of contact angle hysteresis when the first support plate 21 and the second support plate 22 are made of mica sheets.

[0058] In one embodiment, such as Figure 1 As shown, the reaction apparatus 100 for hydrates also includes a power supply 32. Preferably, the power supply 32 is located outside the reaction chamber 1, so that it can be connected to the polyimide membrane 31 via a wire 33 (described below) to provide power.

[0059] In a preferred embodiment, the power supply 32 is a DC power supply. It has advantages such as small size, good stability, and high voltage regulation accuracy, thereby ensuring the accuracy of the polyimide film 31 in controlling the temperature of the first support plate 21.

[0060] In one embodiment, such as Figure 1As shown, the reaction apparatus 100 for hydrates also includes a wire 33. Preferably, the wire 33 connects the polyimide film 31 to the power supply 32, thereby helping to improve the accuracy of the polyimide film 31 in controlling the temperature of the first support plate 21 at a fixed point.

[0061] In one embodiment, each wire 33 is connected to a polyimide film 31. Thus, the heating of each polyimide film 31 is independent; in other words, the heating of each polyimide film 31 can be precisely controlled via the wires 33, thereby enabling point-to-point temperature control of the polyimide film 31 on the first support plate 21 according to observation requirements.

[0062] In this way, the decomposition process of hydrates in the three regions of solid-liquid interface, liquid-gas interface, and solid-liquid-gas interface can be diversified, thereby enabling the collection of experimental data under various different conditions, which can provide useful assistance for studying the change process of hydrates.

[0063] According to the present invention, such as Figure 1 As shown, the reaction apparatus 100 for hydrates also includes a pipeline 41. Preferably, the pipeline 41 is located outside the reaction chamber 1 and is capable of injecting experimental gas into the reaction chamber 1. Thus, a three-phase interface of solid, liquid, and gas can be rapidly constructed within the reaction chamber 1, further providing an effective observation environment for the liquid bridge 201.

[0064] In a preferred embodiment, the experimental gas is typically methane or carbon dioxide.

[0065] Compared to existing technologies, this invention can selectively inject gas into the reaction chamber 1 through pipeline 41, thereby forming three interfaces within the reaction chamber 1: solid-liquid, liquid-gas, and solid-liquid-gas. This allows for the recording of multiple states of hydrates during nucleation and decomposition within the reaction chamber 1, further increasing the amount of experimental data available. This significantly aids in the study of hydrate transformation processes.

[0066] Correspondingly, by controlling the temperature of the first support plate 21 at a fixed point through the polyimide film 31, it is possible to record more decomposition processes of hydrates under three conditions: solid-liquid interface, liquid-gas interface, and solid-liquid-gas interface, which will help in subsequent research on the hydrate change process.

[0067] In one embodiment, such as Figure 1As shown, the reaction apparatus 100 for hydrates also includes a sensor 42. Preferably, the sensor 42 is installed on the pipeline 41 so as to monitor the gas pressure value in the reaction chamber 1 in real time, and to discharge the gas in the reaction chamber 1 through the separator 51 (described below) when the gas pressure value is too high, so as to ensure that the gas pressure in the reaction chamber 1 is in a stable state.

[0068] According to the present invention, such as Figure 1 As shown, the reaction apparatus 100 for hydrates also includes a separator 51. Preferably, the separator 51 is located outside the reaction chamber 1 and is capable of receiving fluid from the reaction chamber 1 for proper recycling, thereby improving the environmental performance of the reaction apparatus 100 for hydrates.

[0069] In one embodiment, a high-pressure, low-temperature resistant sealing gasket is provided at the junction of the separator 51 and the reaction chamber 1 to ensure that the reaction chamber 1 can always maintain a sealed environment and to ensure that the separator 51 can smoothly receive the fluid from the reaction chamber 1.

[0070] In one embodiment, such as Figure 1 As shown, the reaction apparatus 100 for hydrates also includes a gas-liquid recovery unit 52. Preferably, the gas-liquid recovery unit 52 is located at the free end of the separator 51, thereby enabling it to receive fluid from the separator 51 and to perform gas-liquid separation of the fluid for separation and recovery.

[0071] According to a second aspect of the invention, an observation apparatus is provided, comprising a microscope observation stage (not shown in the drawings) and a reaction device 100 disposed on the microscope observation stage according to the above description.

[0072] It is easy to understand that since reaction chamber 1 is a sealed chamber made of transparent material, the hydrates in different states inside reaction chamber 1 can be observed through the microscope on the microscope observation stage, thereby recording the experimental data generated by the nucleation and separation process of hydrates in the three regions of solid-liquid interface, liquid-gas interface and solid-liquid-gas interface.

[0073] According to a third aspect of the present invention, a method for observing hydrate change processes using an observation device as described above is provided, comprising the following steps.

[0074] First, standard liquid is dripped into the first support plate 21 and the second support plate 22 respectively.

[0075] Then, by adjusting the telescopic rod 23, the second support plate 22 moves toward the first support plate 21 until the standard liquid forms a liquid bridge 201 between the first support plate 21 and the second support plate 22.

[0076] Specifically, by adjusting the telescopic rod 23, the second support plate 22 is moved towards the first support plate 21 until the water droplets on the first support plate 21 come into contact with the second support plate 22, thereby forming a meniscus structure. The reaction chamber 1 is then left to stand for 24 hours to ensure that the water droplets within it reach a state of evaporation and condensation equilibrium.

[0077] Subsequently, experimental gas was injected into reaction chamber 1 through pipeline 41, thereby enabling the observation of the nucleation process of hydrates in three regions: the solid-liquid interface, the liquid-gas interface, and the solid-liquid-gas interface.

[0078] It is easy to understand that at this time, reaction chamber 1 is in a low-temperature environment, and the low-temperature environment is achieved by liquid nitrogen.

[0079] Simultaneously, during the hydrate nucleation process, separator 51 and gas-liquid recovery unit 52 need to be opened to release excess gas in reaction chamber 1. Furthermore, sensor 42 monitors the gas pressure in reaction chamber 1 in real time to ensure its safety.

[0080] Subsequently, by adjusting the temperature of the outer surface 211 of the first support plate 21 through the polyimide film 31, the decomposition process of the hydrate in the three regions of the solid-liquid interface, the liquid-gas interface, and the solid-liquid-gas interface can be observed.

[0081] Specifically, the polyimide film 31 enables point heating of the first support plate 21, thereby heating and decomposing hydrates at different locations. Furthermore, by changing the current output through the power supply 32, the changes in hydrates within a small temperature range can be observed and analyzed.

[0082] Finally, after the observation is completed, the fluid in reaction chamber 1 is recovered sequentially through separator 51 and gas-liquid recovery unit 52.

[0083] Compared with the prior art, the present invention has the following advantages.

[0084] Firstly, this invention is suitable for physical observation and analysis of the nucleation and decomposition processes of hydrates in three regions: the solid-liquid interface, the liquid-gas interface, and the solid-liquid-gas interface. Furthermore, because it can effectively adjust the liquid bridge 201 (curved surface) via the telescopic rod 23, it possesses high innovation and design rationality.

[0085] Secondly, since the polyimide film 31 in this invention is distributed at multiple locations on the outer surface 211 of the first support plate 21, the polyimide film 31 has the ability to heat the first support plate 21 at specific points, thereby ensuring that the liquid bridge 201 between the first support plate 21 and the second support plate 22 can be decomposed at specific points, and thus can collect experimental data generated under various different conditions, which further provides useful assistance for studying the hydrate change process.

[0086] Thirdly, the present invention enables the polyimide film 31 to have a temperature regulation capability of ±0.1℃ through the power supply 32, thereby realizing flexible control of the temperature at specific points on the first support plate 21. Furthermore, since the temperature regulation range of the polyimide film 31 is -40℃ to 200℃, the reaction device 100 for hydrates can meet the application scenarios where space is limited or contact with vacuum, oil, or chemical materials is required.

[0087] Fourth, the invention has a small overall size and focuses on indoor micro-scale observation and analysis, thereby enabling the study of the physical mechanism of hydrate phase change mass transfer process under the influence of different interfaces. This invention has the advantages of simple operation, short testing time, and high potential for widespread application.

[0088] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A reaction apparatus for hydrates, comprising: The reaction chamber (1), and The sample mechanism installed in the reaction chamber (1) includes a pair of parallel sample stages, a first support plate (21) and a second support plate (22) respectively installed on the two sample stages for containing standard liquid, and a telescopic rod (23) connected to the sample stages. The second support plate (22) is configured to move toward the first support plate (21) under the action of the telescopic rod (23) to cause the standard liquid to form a liquid bridge (201) between the first support plate (21) and the second support plate (22). The reaction device also includes a polyimide membrane (31) disposed on the first support plate (21), a power supply (32) disposed outside the reaction chamber (1), and a plurality of wires (33) disposed between the polyimide membrane (31) and the power supply (32). A plurality of polyimide membranes (31) are disposed at equal intervals along the circumferential and radial directions on the outer side (211) of the first support plate (21) away from the second support plate (22). Each wire (33) is connected to a polyimide membrane (31).

2. The reaction apparatus for hydrates according to claim 1, characterized in that, The first support plate (21) is constructed as a silicon wafer or mica sheet in the form of a disk.

3. The reaction apparatus for hydrates according to claim 2, characterized in that, The reaction chamber (1) is constructed as a sealed chamber made of transparent material.

4. The reaction apparatus for hydrates according to claim 3, characterized in that, The reaction apparatus also includes a pipeline (41) for injecting experimental gas into the reaction chamber (1), and a sensor (42) installed on the pipeline (41) for monitoring the gas pressure value inside the reaction chamber (1).

5. The reaction apparatus for hydrates according to claim 4, characterized in that, The reaction apparatus further includes a separator (51) for receiving fluid in the reaction chamber (1) and a gas-liquid recovery unit (52) disposed at the free end of the separator (51).

6. An observation apparatus comprising a microscope observation stage and a reaction device according to any one of claims 1 to 5 disposed on the microscope observation stage.

7. A method for observing hydrate change processes using the observation device of claim 6, comprising the following steps: S1. Standard liquid is dripped into the first support plate (21) and the second support plate (22) respectively, and the second support plate (22) is moved towards the first support plate (21) by adjusting the telescopic rod (23) so as to cause the standard liquid to form a liquid bridge (201) between the first support plate (21) and the second support plate (22). S2. Experimental gas is injected into the reaction chamber (1) through pipeline (41) to observe the nucleation process of hydrates at the solid-liquid-gas three-phase interface; S3. The temperature of the outer side (211) of the first support plate (21) is adjusted by the polyimide membrane (31) to observe the decomposition process of the hydrate in the solid-liquid-gas three-phase interface, and the decomposed fluid is discharged through the separator (51) and the gas-liquid recovery device (52) in sequence.

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