CN113092272B - Preparation and decomposition system for massive natural gas hydrate sample - Google Patents
Preparation and decomposition system for massive natural gas hydrate sample Download PDFInfo
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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Abstract
The invention discloses a preparation and decomposition system for a blocky natural gas hydrate sample, which comprises a hydrate synthesis and pressing subsystem, a hydrate crushing decomposition and metering subsystem, a pressure maintaining transfer ball valve and the like, wherein the pressure maintaining transfer ball valve is arranged between the hydrate synthesis and pressing subsystem and the hydrate crushing decomposition and metering subsystem, the pressure maintaining transfer ball valve is connected with the two subsystems, so that the integration of the hydrate sample synthesis system and the breaking decomposition system is realized, the sample quality is ensured to the maximum extent, the experiment interference factors are reduced, on the basis of the capability of synthesizing a blocky hydrate sample, the compactness of the hydrate block is controlled, meanwhile, pressure maintaining transfer and rotary crushing of the sample are realized, and functions of acquiring the gas production characteristics of hydrate decomposition in different crushing and fluidizing processes are finally realized, and the split design is adopted, so that the method is more scientific and reasonable, and the expansion or decomposition of hydrate blocks caused by depressurization can be effectively avoided; and effective data support is provided for work such as development of a leakage type hydrate resource exploitation process, capacity prediction and the like.
Description
Technical Field
The invention belongs to the field of marine natural gas hydrate experiment simulation and analysis testing, and particularly relates to a block natural gas hydrate sample preparation and decomposition system which can simulate and synthesize thick-layer, pulse, nodule and other occurrence-causing hydrates and carry out a dynamic characteristic experiment of breaking, fluidizing and decomposing of the block hydrates.
Background
In recent years, natural gas hydrate (hydrate for short) containing methane as a main component has received attention from countries around the world as a novel energy source with a large resource amount (Collett et al, 2015; Boswell et al, 2019). At present, four times of trial exploitation of natural gas hydrates in the sea area are respectively carried out in China, Japan and other countries, and the feasibility of development of hydrate resources is gradually verified. However, the currently implemented pilot mining of natural gas hydrates all aims at designing engineering schemes and researching and developing mining processes by taking diffusion hydrate ore bodies as targets, and research and development of seepage hydrate mining technologies mainly taking lumps as production states are still in a groping stage.
The fluid containing hydrocarbon components on the seabed is transported to a proper temperature and pressure environment on the shallow surface along a fault or a leakage channel such as a structural weak zone and the like, and then, a macroscopic block hydrate can be formed and takes the shapes of a nodule, a lens or a layer and the like. The hydrate of the shallow surface layer, which is endowed to special geologic bodies such as mud volcanoes, mud bottom splits or pockmarks, is buried shallow and has high saturation, and has stronger mining potential (Gong Ming et al, 2018; Liu Jie et al, 2016). In a pyramid model of hydrate reservoir resource potential and mining difficulty (Boswell et al, 2006), blocky hydrates occupy important positions. The in-situ decomposition gas production method has poor adaptability generally because the reservoir formation mode and the distribution characteristics are obviously different from those of a pore filling type hydrate. Therefore, a batch of physical parameters for exploiting the block hydrate needs to be rapidly and accurately obtained by means of technical means such as simulation experiments, and effective support is provided for research and development of the hydrate exploitation process.
In the prior art, published hydrate sample preparation schemes mainly fall into two categories, except for uniformly synthesizing a diffusion hydrate sample (with a grant number of CN103528865B and the like) in a sediment, block hydrate (seepage hydrate) sample preparation mainly includes four categories, which are respectively: (1) hydrate synthesis based on spray, bubble gas supply (publication No. CN107875991A, No. CN 110305706B); (2) hydrate synthesis with compressed gas cycle refrigeration (publication No. CN 103992829A); (3) only controlling the temperature and pressure environment to carry out natural synthesis of hydrate (publication numbers CN110501195A, CN 102125815A); (4) hydrate synthesis based on geotechnical centrifuge simulated formation pressure (publication No. 111583770 a).
However, the above hydrate sample preparation scheme suffers from the following drawbacks:
(1) it is difficult to simulate the physical property difference of seabed block hydrate caused by the difference of the accumulation conditions in nature:
the existing block hydrate analog synthesis device is mainly used for spontaneously forming hydrate crystals in a proper temperature and pressure environment after gas and liquid are mixed. The crystal growth of the hydrate is a non-stoichiometric process and has obvious randomness. Even in two experiments under exactly the same conditions, the obtained hydrate conversion may still be significantly different. The hydrate blocks synthesized in the device are not influenced by other external forces, the compaction degree among hydrate particles is different, and the state of the hydrate blocks is obviously different from the state of the hydrate blocks which are extruded and reformed by strata under natural conditions.
(2) The existing blocky hydrate simulation device is not designed with the functions of treatment and pressure maintaining transfer after sample synthesis:
because 100% conversion of natural gas and water into hydrate is difficult to realize, the excess liquid can be discharged out of the synthetic model before the decomposition experiment is carried out, and the method is necessary for further quantitative discussion of the gas production and water production law of hydrate decomposition. In addition, the processes involved in the press synthesis and the crushing decomposition of the block hydrate sample are complex, a single high-pressure experimental device is difficult to realize the sample preparation and the decomposition simultaneously, the factors are not fully considered in the existing experimental device, and a similar design method is not seen.
Disclosure of Invention
The invention provides a preparation and decomposition system for a blocky hydrate sample, aiming at overcoming the defects in the prior art, and the preparation and decomposition system can simultaneously realize pressure-maintaining transfer and rotary crushing of the sample.
The invention is realized by adopting the following technical scheme: a blocky natural gas hydrate sample preparation and decomposition system comprises an injection and exhaust system, an injection and drainage system, a temperature control system, a data acquisition system, a hydrate synthesis and pressing subsystem, a hydrate crushing and decomposition and metering subsystem, a back pressure system and a pressure maintaining transfer ball valve arranged between the hydrate synthesis and pressing subsystem and the hydrate crushing and decomposition and metering subsystem;
the hydrate synthesis and pressing subsystem is used for synthesizing a hydrate sample and pressing the sample according to experimental requirements and comprises a visual variable-volume hydrate preparation model and a servo control system, wherein a sample pressing rod connected with the servo control system is arranged in the visual variable-volume hydrate preparation model, the sample pressing rod moves up and down along the visual variable-volume hydrate preparation model, the sample pressing rod can be used for compacting the hydrate sample and pushing the hydrate sample to the hydrate crushing, decomposing and metering subsystem, an air inlet and a liquid inlet are arranged on the side surface of the bottom of the visual variable-volume hydrate preparation model and are respectively and correspondingly connected with an injection and exhaust system and an injection and drainage system to provide a source for hydrate sample synthesis, and the liquid inlet can also be used for discharging residual liquid in the model after sample pressing;
the back pressure system is connected with the visual variable-volume hydrate preparation model and comprises a high-pressure buffer tank and a back pressure pump, and a back pressure valve and a pressure gauge are connected between the high-pressure buffer tank and the back pressure pump and used for maintaining the pressure stability in the visual variable-volume hydrate preparation model in the sample pressing process;
the hydrate crushing decomposition and measurement subsystem is used for developing a massive hydrate crushing fluidization exploitation simulation experiment, and comprises a hydrate sample storage model, a rotary crusher, a magnetic rotary system, a motor, a gas-liquid separator and a gas flowmeter, wherein the rotary crusher is arranged in the hydrate sample storage model, the magnetic rotary system drives the rotary crusher to crush a sample under the driving of the motor, the hydrate sample storage model is connected with the gas-liquid separator and the gas flowmeter, and decomposed gas firstly enters the gas-liquid separator to be dried and then is recorded through the gas flowmeter.
Further, the inner diameter of the opening of the pressure maintaining transfer ball valve, the inner diameter of the visible variable-volume hydrate preparation model and the inner diameter of the hydrate sample storage model are the same.
Furthermore, a displacement and stress sensor connected with a data acquisition system is installed on the sample pressing rod and used for automatically controlling the compression amplitude of the sample and calculating the size of the hydrate sample.
Furthermore, an upper window is arranged on the side wall of the visible variable-volume hydrate preparation model, and a lower window is arranged on the side wall of the hydrate sample storage model.
Furthermore, a back pressure valve is arranged on the hydrate sample storage model to adjust the internal pressure.
Furthermore, the hydrate synthesis and pressing subsystem and the hydrate crushing, decomposing and metering subsystem are arranged in the temperature control system, and the temperature is adjusted by the additionally arranged temperature control system, so that the solid-liquid multiphase flow decomposition depressurization or heating decomposition process of the hydrate can be simulated.
Furthermore, the visible variable-volume hydrate preparation model and the pressure transfer ball valve are made of stainless steel materials.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the system for preparing and decomposing the blocky natural gas hydrate sample, on the basis of the capability of synthesizing the blocky hydrate sample, the compactness of a hydrate block is controlled, the pressure maintaining transfer and the rotary crushing of the sample are realized at the same time, and finally, the functions of acquiring the characteristics of decomposing and generating gas of the hydrate and the like in different crushing and fluidizing processes are realized, the physical parameters corresponding to the synthesis environment of the blocky hydrate, such as hardness, density and the like, and the experimental data of the characteristics of decomposing and generating gas after crushing and fluidizing the blocky hydrate and the like are acquired, and the system is designed in a split mode and is more scientific and reasonable; and pressure maintaining transfer is adopted, so that expansion or decomposition of the hydrate block due to depressurization can be effectively avoided; and effective data support is provided for work such as development of a leakage type hydrate resource exploitation process, capacity prediction and the like.
Drawings
FIG. 1 is a schematic diagram of a hydrate sample preparation and decomposition system according to an embodiment of the present disclosure;
wherein, 1, servo control system; 2. displacement and stress sensors; 3. preparing a model of the visible variable volume hydrate; 4. pressing a sample rod; 5. an upper window; 6. a high-pressure buffer tank; 7. a back pressure pump; 8. a pressure maintaining transfer ball valve; 9. hydrate sample preservation model; 10. a lower window; 11. a rotary crusher; 12. a magnetic rotation system; 13. a motor; 14. a gas-liquid separator; 15. a gas flow meter; 16. a back pressure valve; 17. an air injection and exhaust system; 18. and a liquid injection and drainage system.
Detailed Description
In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and thus, the present invention is not limited to the specific embodiments disclosed below.
The embodiment provides a bulk natural gas hydrate sample preparation and decomposition system, as shown in fig. 1, including a hydrate synthesis and pressing subsystem, a hydrate crushing and decomposition and metering subsystem, a pressure maintaining transfer ball valve 8, an air injection and exhaust system 17, an injection and drainage system 18, a back pressure system, a temperature control system and a data acquisition system, where the pressure maintaining transfer ball valve 8 is arranged between the hydrate synthesis and pressing subsystem and the hydrate crushing and decomposition and metering subsystem, and specifically:
the hydrate synthesis and pressing subsystem is used for synthesizing a hydrate sample and pressing the sample according to experimental requirements, and continuously refers to fig. 1, and comprises a visual variable-volume hydrate preparation model 3 and a servo control system 1, wherein an upper window 5 is arranged on the side wall of the visual variable-volume hydrate preparation model 3, a sample pressing rod 4 connected with the servo control system 1 is arranged in the visual variable-volume hydrate preparation model and used for compacting the hydrate sample, a displacement and stress sensor 2 is arranged on the sample pressing rod 4 and used for automatically controlling the sample compression amplitude and calculating the size of the hydrate sample, an air inlet and a liquid inlet are arranged on the side face of the bottom of the visual variable-volume hydrate preparation model 3 and respectively and correspondingly connected with an injection and exhaust system 17 and an injection and drainage system 18, so that a source is provided for hydrate sample synthesis, and meanwhile, the liquid inlet can also be used for discharging residual liquid in the model after sample pressing.
The structural design of the hydrate synthesis and pressing subsystem can simulate the actual stratum extrusion environment to prepare a massive natural gas hydrate sample: in a natural environment, hydrate blocks are buried in sediments from the surface of the sea bottom to a hundred-meter scale, and sediments at different depths generate strong extrusion on the underlying hydrates through gravity, so that the compactness of the block hydrates changes along with the depth. In the conventional visible variable-volume hydrate preparation model, the hydrate sample is in an internal and external isobaric environment, and the sample does not bear the extrusion effect. The hydrate synthesis and sample pressing subsystem realizes sample pressing under an artificial controllable condition, a servo control system drives a sample pressing rod to move downwards to simulate the stratum compaction effect, a displacement and stress sensor is mounted at the upper end of the sample pressing rod, the pressing amplitude and the stress borne by a sample are obtained in real time, the sample pressing strength is controlled according to the actual marine burial condition, and a hydrate sample which is closer to a natural occurrence shape is prepared;
and through going in and out from top to bottom, the simulation seabed gas leakage environment carries out hydrate sample preparation, improves the conversion rate, and in this scheme, the gas supply process sets for annotates exhaust system pressure and is higher than the backpressure pump pressure. The gas is input into the model from the lower part by the gas injection and exhaust system, is output by the back pressure pump pipeline and returns to the gas injection and exhaust system after being transferred to the upper part, so that the dynamic circulation of the gas in the hydrate synthesis process from the lower part to the upper part is realized, and the uniform and large-scale synthesis of the hydrate in the liquid is facilitated.
The back pressure system is connected with the visual variable-volume hydrate preparation model 3 and comprises a high-pressure buffer tank 6 and a back pressure pump 7, and a back pressure valve and a pressure gauge are connected between the high-pressure buffer tank 6 and the back pressure pump 7 and used for maintaining the pressure stability in the visual variable-volume hydrate preparation model 3 in the sample pressing process. The sample preparation and transfer are assisted, in the sample pressing link, the gas pressure of the high-pressure buffer tank is controlled through the back pressure pump, the pressure compensation is carried out on the preparation model, the pressure change in the model caused by the volume change of the hydrate in the sample pressing process can be overcome, and the constant pressure environment of sample preparation is maintained. After the sample is pressed, the back pressure system provides pressure to discharge excess liquid in the model from the liquid injection and drainage system 18, so that no liquid interference exists in the next experimental sample transfer process.
In the embodiment, the visible variable-volume hydrate preparation model 3 is made of stainless steel, the effective volume is 120ml, the visible diameter phi of the upper window 5 is 20mm, the functions of LED adjustable light source illumination and video acquisition are assisted, and video information can assist an experimenter in observing the whole preparation process of a hydrate sample and correctly judging the conversion rate, compaction quality, transfer state and the like of the hydrate; the diameter phi of the sample pressing rod 4 is 35mm, the stroke of the displacement and stress sensor 2 is 200mm, and the precision is 0.25%. The pressure-maintaining transfer ball valve 8 resists 20MPa, the drift diameter is phi 40mm, the valve body is made of stainless steel, and the valve body passes through the PTFE combined gasket in a sealing mode.
The hydrate crushing, decomposing and metering subsystem is used for developing massive hydrate crushing, fluidizing and mining simulation experiments and comprises a hydrate sample storage model 9, a rotary crusher 11, a magnetic rotating system 12, a motor 13, a gas-liquid separator 14 and a gas flowmeter 15, wherein a lower window 10 is arranged on the side wall of the hydrate sample storage model 9, the rotary crusher 11 is arranged in the hydrate sample storage model 9, the magnetic rotating system 12 drives the rotary crusher 11 to crush a sample under the driving of the motor 13, and the hydrate sample storage model 9 is further connected with a back pressure valve 16 to adjust the pressure of the hydrate sample storage model 9. The hydrate crushing, decomposing and metering subsystem is arranged in the temperature control system, the temperature is adjusted through the additionally arranged temperature control system, the solid-liquid multi-phase flow decomposing, pressure reducing or heating and decomposing process of the hydrate can be simulated, decomposed gas firstly enters the gas-liquid separator 14 to be dried, and then the gas flowmeter 15 is used for recording.
The so-called fracturing and fluidizing mining is a mining process of the block hydrate, which mainly uses mechanical stirring or cutting to make the block hydrate into a solid-liquid mixture, then the solid-liquid mixture is transported from the seabed to the sea surface through a pipeline, and the hydrate fragments are gradually decomposed into natural gas and water due to the change of ambient temperature and pressure in the lifting process. The device can evaluate the state of the solid-liquid mixed multiphase flow generated by the blocky hydrate under different crushing strengths and time and the corresponding decomposition gas generation speed, and provides a series of effective parameters for the research of the hydrate crushing fluidization mining process.
In this embodiment, magnetic force rotating system drives the rotary crusher under the drive of motor and carries out the breakage to the sample, and the rotary crusher speed can be controlled to the accessible setting for motor power, can realize the hydrate sample breakage and state analysis under the high pressure environment. The magnetic rotating system uses a magnetic coupling transmission mode, effectively solves the inherent leakage problem of packing seal and mechanical seal, drives the rotary crusher through magnetic force under the static seal condition, and is suitable for a high-pressure experimental device; the lower window of the side wall of the model can provide a sampling channel for other solid and multiphase flow testing devices such as a laser Raman particle analyzer or a high-speed camera and the like, so that the particle size and solid-liquid phase ratio of multiphase flow particles under different crushing strengths and time can be obtained, and background parameters are provided for a subsequent hydrate decomposition experiment.
Wherein, hydrate sample preserves model effective volume 120ml, the visual diameter phi 20mm of lower part window uses the illumination of the adjustable light source of LED, the rotatory tool bit material of magnetic control of rotatory cracker 11 is the stainless steel, can require to change different grinding apparatus to the sample breakage according to the experiment, the servo motor 13 that the bottom is connected is the rotatory tool bit power supply, through the outer magnet of servo motor shaft connection, it is rotatory to drive inside magnet, inside magnet is through rightting the bearing, the rotation axis, the broken hydrate sample of rotatory tool bit. The magnetic coupling transmission mode solves the inherent leakage problem of the packing seal and the mechanical seal, is suitable for a high-pressure experimental device, and has the advantages that the power of a servo motor is not less than 400W, the rotating speed is 0-3000 r/min, and the adjusting precision is 1 r/min.
This embodiment shifts the ball valve through the pressurize and carries out the sample and shift, avoids hydrate sample decompression deformation: the compactness and hardness of the block hydrate are direct factors influencing the breaking and fluidizing effects, and a hydrate sample is synthesized in a high-pressure environment, so that once pressure is relieved and transferred, the volume expansion and partial decomposition of the sample can be caused, and the sample preparation effect is damaged. This experimental system passes through the ball valve switching and presses the propelling movement of appearance pole, realizes the pressurize of sample and shifts, avoids the emergence of above-mentioned problem. The inner diameter of an opening of the pressure maintaining transfer ball valve, the inner diameter of a visible variable-volume hydrate preparation model and the inner diameter of a hydrate sample storage model are the same. After sample preparation is finished, the temperature and pressure settings of the two subsystems (the hydrate synthesis and pressing subsystem and the hydrate crushing, decomposing and metering subsystem) are the same. At the moment, the pressure maintaining transfer ball valve is rotated for 90 degrees, the two subsystems are communicated, and the massive hydrate sample is pushed downwards through the sample pressing rod to move to the lower hydrate crushing and decomposing metering subsystem.
The pressure-maintaining transfer ball valve is connected with the two subsystems, so that the integration of the hydrate sample synthesis system and the hydrate sample crushing and decomposing system is realized, the sample quality is guaranteed to the maximum extent, and the experiment interference factors are reduced.
In a specific laboratory, the pressure of the hydrate sample storage model can be controlled and adjusted through the backpressure valve 16, the temperature is adjusted through an additionally configured temperature control system, and the decomposition pressure reduction or heating decomposition process of solid-liquid multiphase flow containing hydrate can be simulated. The device can simulate a depressurization or heating environment and accurately measure the gas production data of the hydrate decomposition. The decomposed gas firstly enters a gas-liquid separator 14 for drying, and then is recorded through a gas flowmeter 15, so that the gas production speed can be obtained in real time, and the hydrate decomposition process can be further analyzed. Finally, the correlation among the series of parameters of the compactness, the crushing strength and time, the solid-liquid multiphase flow state, the decomposition condition and the gas production characteristic of the blocky hydrate is established, and effective parameters are provided for evaluating the breaking fluidization mining process of the blocky hydrate.
In addition, the system of the embodiment is also provided with a special data acquisition control system to realize the real-time acquisition of values such as pressure, displacement, rotating speed and the like in the preparation and decomposition processes of the hydrate sample, acquire and control the rotating speed of the servo motor, the forward rotation and the reverse rotation in real time, automatically acquire all values such as pressure, displacement, rotating speed and the like, automatically store data, save and backup, and have the functions of unexpected shutdown recovery and continuous storage. The original data report, the analysis report and the curve graph can be generated, and the database file format is generated at the same time, which is not described in more detail herein.
Aiming at the hydrate sample preparation and decomposition system, during specific operation, the decomposition gas production behavior model experiment method is as follows:
(1) the system is placed in an accurate temperature control gas bath box (temperature control system), the liquid amount required by a hydrate synthesis experiment is estimated according to the density difference of the hydrate and water and by combining the effective volume in a visible variable-volume hydrate preparation model, the liquid amount is added into the model, and the preparation model is pressurized to a set value through an air injection and exhaust system. Standing for 24 hours until the gas is dissolved in balance, starting the temperature control gas bath box to the experimental set temperature, and starting to synthesize the hydrate. In order to improve the liquid conversion rate, gas can be continuously injected from the lower part after a period of synthesis, and a back pressure system is used for pressure stabilization exhaust to form gas dynamic circulation until the liquid is basically converted to form a hydrate sample;
(2) after the hydrate samples are synthesized, setting the pressing stroke of a sample pressing rod, controlling a servo control system to start sample pressing, and setting the compaction degree according to the hydrate samples simulating different occurrence conditions to prepare a series of blocky hydrate samples with different densities and hardnesses; after the sample pressing is finished, liquid reserved in the preparation model is discharged by opening and closing the liquid injection and discharge system;
(3) and injecting gas with the same pressure into the lower part of the experimental system, and opening the middle sample transfer ball valve. And setting the sample crushing degree according to an experimental target, selecting a corresponding blade and a corresponding rotating speed, and controlling and starting a lower servo control system. The sample pressing rod downwards extrudes and discharges the prepared hydrate model at a set speed, and the lower rotary blade finishes the crushing work of the hydrate; the process can record video through a visual window and judge the crushing degree of the sample;
(4) the hydrate decomposition experiment is started in a pressure reduction or temperature rise mode, and decomposed gas is processed by the gas-liquid separator 14, is measured in real time by the gas flowmeter 15 and is stored in a computer for subsequent analysis and research.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (7)
1. The preparation and decomposition system of the massive natural gas hydrate sample comprises an injection and exhaust system (17), an injection and drainage system (18), a temperature control system and a data acquisition system, and is characterized by further comprising a hydrate synthesis and pressing subsystem, a hydrate crushing and decomposition and metering subsystem, a back pressure system and a pressure maintaining transfer ball valve (8), wherein the back pressure system is connected with a visual variable-volume hydrate preparation model (3), and the pressure maintaining transfer ball valve (8) is arranged between the hydrate synthesis and pressing subsystem and the hydrate crushing and decomposition and metering subsystem;
the hydrate synthesis and pressing subsystem is used for synthesizing hydrate samples and pressing the samples according to experimental requirements and comprises a visual variable-volume hydrate preparation model (3) and a servo control system (1), a sample pressing rod (4) connected with the servo control system (1) is arranged inside the visual variable-volume hydrate preparation model (3), the sample pressing rod (4) moves up and down along the visual variable-volume hydrate preparation model (3), and the bottom of the visual variable-volume hydrate preparation model (3) is connected with an injection and exhaust system (17) and an injection and drainage system (18);
the hydrate crushing, decomposing and metering subsystem comprises a hydrate sample storage model (9), a rotary crusher (11), a magnetic rotary system (12), a motor (13), a gas-liquid separator (14) and a gas flowmeter (15), wherein the rotary crusher (11) is arranged in the hydrate sample storage model (9), the magnetic rotary system (12) drives the rotary crusher (11) to crush a sample under the driving of the motor (13), and the hydrate sample storage model (9) is connected with the gas-liquid separator (14) and the gas flowmeter (15).
2. The bulk natural gas hydrate sample preparation and decomposition system of claim 1, wherein: the back pressure system comprises a high-pressure buffer tank (6) and a back pressure pump (7), and a back pressure valve and a pressure gauge are connected between the high-pressure buffer tank (6) and the back pressure pump (7).
3. The bulk natural gas hydrate sample preparation and decomposition system of claim 1, wherein: the inner diameter of an opening of the pressure maintaining transfer ball valve (8), the inner diameter of the visible variable-volume hydrate preparation model and the inner diameter of the hydrate sample storage model are the same.
4. The bulk natural gas hydrate sample preparation and decomposition system of claim 1, wherein: and a displacement and stress sensor (2) connected with a data acquisition system is arranged on the sample pressing rod (4).
5. The bulk natural gas hydrate sample preparation and decomposition system of claim 1, wherein: an upper window (5) is arranged on the side wall of the visible variable-volume hydrate preparation model (3), and a lower window (10) is arranged on the side wall of the hydrate sample storage model (9).
6. The bulk natural gas hydrate sample preparation and decomposition system of claim 1, wherein: the hydrate sample storage model (9) is also provided with a back pressure valve (16).
7. The bulk natural gas hydrate sample preparation and decomposition system of claim 1, wherein: the hydrate synthesis and pressing subsystem and the hydrate crushing, decomposing and metering subsystem are arranged in the temperature control system.
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