In-situ mining simulation experiment system for microwave fragmentation and pyrolysis of oil-rich coal

Abstract

The invention discloses an in-situ mining simulation experiment system for microwave fragmentation pyrolysis of oil-rich coal. The in-situ mining simulation experiment system comprises a microwave pyrolysis device, a servo control device, a monitoring device and a temperature measuring device. The microwave pyrolysis device is used for carrying out microwave pyrolysis fragmentation on a coal sample, the temperature measuring device is used for measuring the real-time temperature of the microwave pyrolysis device for carrying out microwave pyrolysis on the coal sample, a pressing rod of the servo control device is located in a pyrolysis cavity of the microwave pyrolysis device, the pressing rods in multiple directions apply pressure to the coal sample at the same time, and the state that the coal sample bears ground stress is simulated; the monitoring device is used for monitoring pyrolysis and fragmentation conditions of the coal sample, comprises an oil gas monitoring assembly and a crack monitoring assembly, and is used for monitoring microwave pyrolysis oil gas and coal sample internal crack propagation signals. According to the in-situ mining simulation experiment system for microwave fragmentation pyrolysis of the oil-rich coal, the mechanical property and the fragmentation characteristic of the coal sample under external force loading during microwave pyrolysis can be obtained, and meanwhile, the pyrolysis yield of each component of the coal sample under external force loading during microwave pyrolysis can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of coal and oil and gas resource development, and in particular to an in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal. Background Art

[0002] my country's fossil energy landscape is characterized by being rich in coal, poor in oil, and limited in gas. However, the oil and gas resources generated by coal pyrolysis can significantly optimize and improve my country's energy structure. Oil-rich coal, a unique coal resource, is considered the most promising resource for improving my country's energy structure due to its pyrolysis tar yield (Tar, d) ranging from 7% to 12%. Currently, the main methods for developing oil-rich coal are direct mining, surface pyrolysis, and in-situ pyrolysis. Traditional direct mining and surface pyrolysis methods often exploit the oil and gas resources within coal seams, treating them as a source of hazards such as gas outbursts and explosions, and discharging them into the atmosphere through ventilation systems, resulting in a waste of resources. While protective seam mining and fracturing-based coalbed methane development technologies have emerged to further develop these resources, their development has been hampered by their ineffectiveness due to the low permeability of coalbed methane. In-situ pyrolysis, on the other hand, faces challenges such as oil and gas retention, incomplete pyrolysis, solid residues, and the need to determine the optimal heating method.

[0003] In response to the challenges of resource waste, high carbon emissions and environmental pollution faced by the development and utilization of oil-rich coal, relevant technologies provide an in-situ mining idea using a worm-shaped unmanned intelligent coal mining machine (IUMM), which is similar to an earthworm. The IUMM is sent into the coal seam mining face, and the high-energy microwave generator at the front end of the IUMM mining unit uses microwave radiation heating technology to in-situ crush and pyrolyze the oil-rich coal in front of the IUMM, and further separate the coal and gangue. The irradiated coal and semi-coke are converted and utilized to store oil and gas resources. Finally, the gangue is combined with other industrial waste and CO2 carbon fixation filling. This method can achieve green, clean, low-carbon, green and efficient development and utilization of oil-rich coal without "coal leaving the ground".

[0004] At present, the simulation experimental system for in-situ mining of oil-rich coal focuses on the layout of heating methods and the precipitation of pyrolysis oil and gas, without considering the direct in-situ fragmentation mining of oil-rich coal and free oil and gas resources in the coal seam, and the simultaneous pyrolysis of oil-rich coal to obtain pyrolysis oil and gas resources, thereby realizing the full development and utilization of oil-rich coal and its oil and gas resources.

[0005] Therefore, how to design an in-situ mining simulation experimental device for microwave pyrolysis of oil-rich coal to solve the problem that the current laboratory cannot simulate the in-situ mining process of microwave pyrolysis of oil-rich coal, so as to accurately understand the influence of stress on the pyrolysis and crushing effect of coal samples, has become an urgent problem to be solved in the process of promoting indoor physical and mechanical experiments to industrial applications in the field of coal and oil and gas resource development. Summary of the Invention

[0006] This application proposes an in-situ mining simulation experimental system for microwave pyrolysis of oil-rich coal to solve the problem that the in-situ mining process of microwave pyrolysis of oil-rich coal cannot be simulated in the current laboratory, so as to accurately determine the influence of stress on the pyrolysis and crushing effect of coal samples.

[0007] In order to achieve the above objectives, the present application provides an in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal, comprising a microwave pyrolysis device, a servo control device, a monitoring device and a temperature measuring device.

[0008] The microwave pyrolysis device includes a microwave controller, a waveguide, a resonant cavity and a pyrolysis cavity. The microwave controller feeds microwaves into the resonant cavity through the waveguide. The pyrolysis cavity is provided in the resonant cavity. The coal sample is subjected to microwave pyrolysis in the pyrolysis cavity. The temperature measuring device is provided in the pyrolysis cavity for measuring the temperature of the coal sample in the pyrolysis cavity.

[0009] The servo control device includes a pressure controller, a reaction frame, a driving member and a pressure rod. The pressure controller is used to control and monitor the pressure of the driving member. The driving member is installed on the reaction frame. The driving member is used to drive the pressure rod to apply pressure to the coal sample. The pyrolysis chamber is provided with the pressure rod corresponding to the upper end and the lower end of the coal sample and at least one circumferential direction. The pressure rod is located in the pyrolysis chamber and is sealed with the pyrolysis chamber. The pressure rod is made of microwave-transparent material.

[0010] The monitoring device is used to monitor the pyrolysis and fragmentation of the coal sample, and includes an oil and gas monitoring component and a crack monitoring component. The oil and gas monitoring component is connected to the gas outlet pipe of the pyrolysis chamber and is used to monitor the oil and gas generated by the pyrolysis of the coal sample. The crack monitoring component is used to monitor the internal crack extension signal of the coal sample.

[0011] Preferably, in the above-mentioned microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, the pressure rods are arranged at three circumferential positions of the coal sample, wherein the pressure rods at two of the positions are located in a first direction, and the pressure rod at another position is located in a second direction, and the waveguide is located in the second direction and is opposite to the pressure rod located in the second direction;

[0012] The first direction is perpendicular to the second direction, and the first direction is perpendicular to the vertical direction.

[0013] Preferably, in the above microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, the pressure rods are arranged at four circumferential positions of the coal sample, wherein the pressure rods at two of the positions are located in a first direction, and the pressure rods at the other two positions are located in a second direction;

[0014] The first direction is perpendicular to the second direction, and the first direction is perpendicular to the vertical direction.

[0015] Preferably, in the above-mentioned microwave fragmentation pyrolysis in-situ mining simulation experimental system of oil-rich coal, the microwave pyrolysis device also includes a distance adjustment component, and the waveguide is connected to the resonant cavity through the distance adjustment component to adjust the distance between the waveguide and the pyrolysis cavity.

[0016] Preferably, in the above microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, the oil and gas monitoring assembly includes an atmosphere bottle, a condensation collection bottle, a water washing bottle, a drying bottle, a gas collecting bottle and a gas analyzer.

[0017] The atmosphere bottle is connected to the air inlet pipe of the pyrolysis chamber and is used to introduce atmosphere gas into the pyrolysis chamber. The condensation collection bottle, the water washing bottle, the drying bottle, the gas collecting bottle and the gas analyzer are connected in sequence. The inlet of the condensation collection bottle is connected to the air outlet pipe. The condensation collection bottle is provided with a cooling assembly. The condensation collection bottle is used to collect oil in the pyrolysis oil and gas. The water washing bottle is used to remove impurities in the pyrolysis oil and gas. The drying bottle is used to remove moisture in the pyrolysis oil and gas. The gas collecting bottle is used to collect gas in the pyrolysis oil and gas. The gas analyzer is used to monitor and analyze the pyrolysis gas.

[0018] Preferably, in the above-mentioned microwave fragmentation and pyrolysis in-situ mining simulation experimental system for oil-rich coal, the oil and gas monitoring component also includes a heating tape, which is arranged at one end of the condensation collection bottle close to the gas outlet pipe to prevent oil and gas from condensing and blocking the pipeline.

[0019] Preferably, in the above-mentioned microwave fragmentation pyrolysis in-situ mining simulation experimental system of oil-rich coal, the cooling component includes a chiller and a cold water pipe, the chiller is used to provide cooling liquid to the cold water pipe, a part of the cold water pipe is located in the resonant cavity for reducing the temperature of the resonant cavity, and the other part of the cold water pipe is connected to the condenser of the condensation collection bottle, for cooling the oil in the pyrolysis oil gas in the condensation collection bottle.

[0020] Preferably, in the above-mentioned microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, the oil and gas monitoring component further comprises a mass flow meter and a barometer;

[0021] The mass flow meter is provided between the atmosphere bottle and the air inlet pipe, and between the drying bottle and the gas collecting bottle, and is used to monitor the volume of the gas generated by pyrolysis;

[0022] The pressure gauge is arranged between the gas outlet pipe and the condensation collection bottle to monitor the gas pressure and cooperates with the mass flow meter to ensure the precipitation of pyrolysis oil and gas.

[0023] Preferably, in the above microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, the crack monitoring assembly is arranged at the upper end and the lower end of the coal sample, and in at least one of the circumferential pressure rods.

[0024] The crack monitoring assembly includes an acoustic emission sensor.

[0025] Preferably, in the above microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, the pressure rod is sealedly connected to the pyrolysis chamber via a sealing assembly.

[0026] The sealing assembly includes a first sealing member, a second sealing member and a third sealing member,

[0027] The first end of the first sealing member extends into the pyrolysis chamber, the second end of the first sealing member is located outside the pyrolysis chamber, the first end of the second sealing member is sleeved on the second end of the first sealing member, and the end surface of the second end of the second sealing member is provided with the third sealing member, and the third sealing member has a mounting hole for sleeve connection between the third sealing member and the pressure rod.

[0028] The first sealing member is provided with a first connecting plate, and the first connecting plate is connected to the resonant cavity by bolts.

[0029] A second connecting plate is provided at the first end of the second sealing member, and the second connecting plate is connected to the first connecting plate by bolts.

[0030] The second end of the second sealing member is provided with a third connecting plate, and the third connecting plate is connected to the third sealing member via a clamp.

[0031] The first sealing member is provided with a sealing gasket on the outer wall of the pyrolysis chamber.

[0032] A sealing gasket is provided on the outer wall where the first sealing member and the second sealing member are in contact with each other and / or on the inner wall where the second sealing member and the first sealing member are in contact with each other.

[0033] A sealing gasket is provided on one side of the first connecting plate that is in contact with the resonant cavity, and a sealing gasket is provided on the hole wall of the mounting hole.

[0034] Preferably, in the above-mentioned microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, a first mounting hole for mounting the gas outlet pipe is provided at a position where the first sealing member and the second sealing member of the sealing assembly located at the upper end of the coal sample are sleeved and connected;

[0035] or,

[0036] A second mounting hole for mounting the air inlet pipe of the pyrolysis chamber is provided at a position where the first sealing member and the second sealing member of the sealing assembly are sleeved and connected and located at the lower end or circumference of the coal sample.

[0037] Preferably, in the above-mentioned microwave fragmentation pyrolysis in-situ mining simulation experimental system for oil-rich coal, an insulation layer is provided outside the pyrolysis chamber, and the insulation layer is a ceramic fiber insulation layer.

[0038] Preferably, in the above-mentioned microwave fragmentation pyrolysis in-situ mining simulation experimental system of oil-rich coal, a groove for installing the temperature measuring device is provided on the side of the insulation layer close to the pyrolysis chamber, and a metal mesh is provided around the groove. The metal mesh is used to shield the microwaves to reduce the impact of the microwaves on the temperature measuring device.

[0039] Preferably, in the above-mentioned microwave fragmentation and pyrolysis in-situ mining simulation experimental system for oil-rich coal, the temperature measuring device is at least one of an infrared thermometer and a thermal imager.

[0040] The embodiment of the present application provides an in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal, which includes a microwave pyrolysis device, a servo control device, a monitoring device, and a temperature measuring device. The microwave pyrolysis device is used to perform microwave fragmentation and pyrolysis on the coal sample, and the temperature measuring device is used to measure the real-time temperature of the microwave pyrolysis device on the coal sample. The pressure rod of the servo control device is located in the pyrolysis chamber of the microwave pyrolysis device, and the pressure rods in multiple directions simultaneously apply pressure to the coal sample to simulate the state of the coal sample under ground stress. The monitoring device is used to monitor the fragmentation of the coal sample, including an oil and gas monitoring component and a crack monitoring component, which monitor the microwave pyrolysis oil and gas and the internal crack extension signal of the coal sample. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal disclosed in the present application can obtain the mechanical properties and crushing characteristics of the coal sample under external force loading during microwave pyrolysis, and at the same time obtain the pyrolysis yield of each component of the coal sample under external force loading during microwave pyrolysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or prior art descriptions. Obviously, the drawings described below are only some examples or embodiments of the present application. For those of ordinary skill in the art, without paying any creative work, other drawings can be obtained based on the provided drawings, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language context or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0042] Figure 1 Schematic diagram of the structure of the in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application;

[0043] Figure 2 This is a schematic side view of the structure of the connection between the servo control device and the microwave pyrolysis device of the in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application;

[0044] Figure 3 This is a schematic structural diagram of a sealing assembly in an in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application;

[0045] Figure 4 This is a three-dimensional schematic diagram of a sealing component (without a sealing gasket) of an in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application;

[0046] Figure 5 This is a three-dimensional schematic diagram of the position of the sealing gasket of the sealing assembly of the in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application;

[0047] Figure 6 This is a structural three-view drawing of the first sealing component of the sealing assembly of the in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application;

[0048] Figure 7 This is a structural three-view diagram of the second sealing member of the sealing assembly of the in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application;

[0049] Figure 8 This is a structural three-view drawing of the third sealing component of the sealing assembly of the in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal provided in an embodiment of the present application.

[0050] The accompanying drawings are as follows:

[0051] 1-Microwave pyrolysis device; 11-Microwave controller; 12-Waveguide; 13-Resonant cavity; 14-Pyrolysis cavity; 15-Inlet pipe; 16-Outlet pipe; 17-Sealing assembly; 171-Sealing gasket; 172-First sealing member; 173-Second sealing member; 174-Third sealing member; 175-Clamp; 18-Insulation layer; 19-Distance adjustment assembly; 10-Box door; 2-Servo control device; 21-Pressure controller; 22-Reaction frame; 23-Drive member; 24-Pressure rod; 3-Oil and gas monitoring assembly; 31-Atmosphere bottle; 32-Condensation collection bottle; 33-Water washing bottle; 34-Drying bottle; 35-Gas collecting bottle; 36-Gas analyzer; 37-Tracing belt; 45-Chiller; 39-Mass flowmeter; 30-Barometer; 4-Crack monitoring assembly; 5-Temperature measuring device; 6-Coal sample. DETAILED DESCRIPTION

[0052] The present application will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are merely for explaining the related application and are not intended to limit the application. The described embodiments are merely a portion of the embodiments of the present application and are not intended to be exhaustive. All other embodiments derived by persons of ordinary skill in the art based on the embodiments in the present application without creative effort are intended to fall within the scope of protection of the present application.

[0053] It should be noted that, for ease of description, only the portions relevant to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments and features in the embodiments of this application may be arbitrarily combined with each other, as long as the combined technical features are not mutually contradictory. All feasible feature combinations are technical contents explicitly described herein. Any of the multiple sub-features contained in the same statement can be applied independently, and does not necessarily have to be applied together with other sub-features.

[0054] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0055] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0056] See also Figures 1-8 .

[0057] Some embodiments of the present application disclose an in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal, including a microwave pyrolysis device 1, a servo control device 2, a monitoring device and a temperature measuring device 5. Specifically, the microwave pyrolysis device 1 is used to perform microwave pyrolysis on a coal sample, the temperature measuring device 5 is used to measure the real-time temperature of the coal sample 6 during microwave pyrolysis, the servo control device 2 is used to apply pressure to the coal sample in the microwave pyrolysis device 1 to simulate the state of the coal sample 6 subjected to ground stress, and the monitoring device is used to monitor the pyrolysis and fragmentation of the coal sample, specifically, to monitor the microwave pyrolysis oil and gas and the internal crack extension signal of the coal sample 6.

[0058] The microwave pyrolysis device 1 includes a microwave controller 11, a waveguide 12, a resonant cavity 13, and a pyrolysis cavity 14. The microwave controller 11 feeds microwaves into the resonant cavity 13 via the waveguide 12. Specifically, the microwave controller 11 is used to generate microwaves and control the microwave power and irradiation time fed into the resonant cavity 13 by the waveguide 12. The resonant cavity 13 is a metal cavity used to continuously oscillate a high-frequency electromagnetic field. The resonant cavity 13 can be a rectangular or circular resonant cavity. The waveguide 12 is a structure used to directional guide electromagnetic waves. Optionally, a directional coupler can be provided between the microwave controller 11 and the waveguide 12 to prevent microwaves from reflecting back, thereby achieving a directional effect.

[0059] like Figure 1 and Figure 2 As shown, the microwave controller 11 and waveguide 12 are located outside the resonant cavity 13. The waveguide 12 is mounted on the resonant cavity 13. The microwave pyrolysis device 1 can irradiate the coal sample 6 through the waveguide 12 in a directional or non-directional manner. A pyrolysis chamber 14 is disposed within the resonant cavity 13. The coal sample to be pyrolyzed is placed within the pyrolysis chamber 14. The pyrolysis chamber 14 is preferably made of a microwave-transparent material, which can be quartz or a ceramic layer. Optionally, the pyrolysis chamber 14 is a quartz tube that can withstand the temperature of microwave pyrolysis.

[0060] The resonant cavity 13 is a box-shaped structure, and the pyrolysis cavity 14 is a vertical tubular structure. A door 10 is provided on the side of the box-shaped structure of the resonant cavity 13, and mounting holes for mounting the pyrolysis cavity 14 are provided around the periphery. The pyrolysis cavity 14 is disposed throughout the resonant cavity 13, and the upper and lower ends of the pyrolysis cavity 14 are at least flush with the upper and lower end surfaces of the resonant cavity 13. In some embodiments, the resonant cavity 13 is a cubic cavity having a top surface, a bottom surface, and four side surfaces. Mounting holes for mounting the pyrolysis cavity 14 are provided on the top and bottom surfaces. The waveguide 12 is provided on at least one of the four side surfaces, and the door 10 is provided on one of the four side surfaces.

[0061] The servo control device 2 is used to provide a loading force to the coal sample 6 to simulate the ground stress that the coal rock bears during in-situ mining. The loading force of the servo control device 2 can be adjusted according to the type of coal sample. Figure 1 and Figure 2 As shown, the servo control device 2 includes a pressure controller 21, a reaction frame 22, a driving member 23 and a pressure rod 24. The pressure controller 21 is used to control and monitor the pressure of the driving member 23. The driving member 23 is installed on the reaction frame 22. The driving member 23 is connected to the pressure rod 24 and is used to drive the pressure rod 24 to move so that the pressure rod 24 applies pressure to the coal sample 6.

[0062] The pyrolysis chamber 14 is provided with pressure rods 24 corresponding to the upper and lower ends of the coal sample 6 and at least one circumferential direction. The pressure rods 24 are located in the pyrolysis chamber 14 and are sealed with the pyrolysis chamber 14. In this embodiment, the pressure rods 24 are provided at the upper and lower ends of the coal sample 6, and at least one circumferential direction of the coal sample 6 is provided with a pressure rod 24. It can be understood that the circumferential direction of the coal sample 6 has four directions, Figure 1 Taking the angle shown as an example, a pressure rod 24 is provided at least one of the four positions of the coal sample 6, namely, the front, the back, the left and the right.

[0063] The pressure rods 24 located at the upper and lower ends of the coal sample 6 are used to apply a load to the coal sample 6 in the axial direction of the coal sample 6 and to adjust the position of the coal sample 6 along the axial direction of the coal sample 6;

[0064] The pressure rods 24 located in the circumferential direction of the coal sample 6 are used to apply a load perpendicular to the axial direction of the coal sample 6 to the coal sample 6 .

[0065] In some embodiments, pressure rods 24 are provided at three circumferential positions of the coal sample 6, wherein the pressure rods 24 at two positions are located in a first direction, and the pressure rod 24 at another position is located in a second direction, the first direction and the second direction are any two mutually perpendicular directions on a horizontal plane, and the first direction is perpendicular to the axis direction of the coal sample 6. Figure 2 As shown in the example, pressure rods 24 are provided at the front, rear and right positions of the coal sample 6, and a waveguide 12 is provided at the left position.

[0066] In this embodiment, the coal sample 6 is subjected to bidirectional four-axis loading forces, specifically, loading forces in the up and down directions and loading forces in the first direction. The loading forces of the two pressure rods 24 in the up and down directions are in opposite directions, and the loading forces of the two pressure rods 24 in the first direction (front and back directions) are in opposite directions. The position of the coal sample 6 is adjusted, and the pressure of the pressure rod 24 in the second direction (left and right direction) is determined according to the friction force of the pressure rod 24 with bidirectional four-axis load applied to the coal sample 6.

[0067] In this embodiment, a waveguide 12 is provided at the position of the pressure rod 24 corresponding to the second direction (i.e., to the left of the coal sample 6), and the waveguide 12 provides directionally irradiated light to the coal sample 6. In the embodiment in which the waveguide 12 provides directionally irradiated light to the coal sample 6, the waveguide 12 can be fixedly mounted on the resonant cavity 13. The waveguide 12 can also be connected to the resonant cavity 13 via a distance adjustment component 19. The distance adjustment component 19 is used to adjust the distance between the waveguide 12 and the pyrolysis cavity 14, thereby adjusting the distance between the waveguide 12 and the coal sample 6. The radiation intensity of the microwave decreases with increasing distance. By adjusting the distance between the waveguide 12 and the coal sample 6, the radiation intensity received by the coal sample can be controlled, optimizing the energy distribution of the microwave on the coal sample 6 and meeting different irradiation requirements.

[0068] like Figure 1 As shown, a waveguide 12 is provided on the resonant cavity 13. The waveguide 12 moves horizontally under the action of the distance adjustment component 19 to adjust the horizontal distance between the waveguide 12 and the coal sample 6. In the embodiment where a waveguide 12 is provided on the resonant cavity 13, it is movable for unidirectional irradiation.

[0069] In some embodiments, pressure rods 24 are provided at four circumferential positions of the coal sample 6, with the pressure rods 24 in two positions located in a first direction and the pressure rods 24 in the other two positions located in a second direction. The first direction and the second direction are any set of mutually perpendicular directions in a horizontal plane, and the first direction is perpendicular to the axis of the coal sample 6. It can be understood that pressure rods 24 are provided at the front, rear, left, and right positions of the coal sample 6.

[0070] In this embodiment, the coal sample 6 is subjected to bidirectional six-axis loading forces, specifically loading forces in the up and down directions, loading forces in the first direction (front and back direction), and loading forces in the second direction (left and right direction). The loading forces of the two pressure rods 24 in the up and down directions are in opposite directions, and the loading forces of the two pressure rods 24 in the first direction and the second direction are in opposite directions, so as to adjust the position of the coal sample 6.

[0071] In this embodiment, the waveguide 12 can be designed and installed in a specific position based on irradiation requirements. The number of waveguides 12 can be one or at least two, enabling non-directional irradiation of the coal sample 6. The waveguide 12 can be connected to the resonant cavity 13 via a distance adjustment assembly 19, enabling movable, multi-directional irradiation. Optionally, as needed, personnel can move a portion of the waveguides 12 under the control of the distance adjustment assembly 19, while the remaining waveguides 12 remain stationary.

[0072] The distance adjustment component 19 is a commonly used linear drive component. The distance adjustment component 19 can be a telescopic cylinder, a screw assembly or a linear drive motor.

[0073] The coal sample 6 has pressure rods 24 in the up and down directions, the first direction, and the second direction. During actual operation, some or all of the pressure rods 24 can be used to apply load to the coal sample 6 according to needs.

[0074] During operation, the pressure controller 21 controls the movement stroke of the driving member 23, and then controls the pressure of the driving member 23. The driving member 23 drives the pressure rod 24 to apply pressure to the coal sample so that the coal sample bears external force. At the same time, the pressure controller 21 is also used to monitor the changes in pressure during the experiment.

[0075] In this embodiment, the pressure rod 24 has an elastic modulus much greater than that of the coal sample 6, preventing deformation when an external force is applied to the coal sample 6. Optionally, the pressure rod 24 is made of a microwave-transparent material, such as a ceramic rod or a quartz rod, so that the pressure rod 24 entering the microwave pyrolysis device 1 can minimize the impact on the microwave field and the heat conduction of the coal sample 6.

[0076] The driving member 23 is a linear driving member and can be a telescopic cylinder, a lead screw assembly, or a linear drive motor. Optionally, the driving member 23 corresponds to the pressure rod 24 one by one, with one pressure rod 24 mounted on each driving member 23. The driving direction of the driving member 23 is consistent with the axial direction of the pressure rod 24. Optionally, the end surface of the pressure rod 24, which circumferentially matches the shape of the outer wall of the coal sample 6, is adapted to optimize the force exerted by the pressure rod 24 on the coal sample 6.

[0077] In some embodiments, the monitoring device includes an oil and gas monitoring component 3 and a crack monitoring component 4. The oil and gas monitoring component 3 is connected to the outlet pipe 16 of the pyrolysis chamber 14. The oil and gas generated by microwave pyrolysis of the coal sample in the pyrolysis chamber 14 enters the oil and gas monitoring component 3 through the outlet pipe 16. The crack monitoring component 4 is used to monitor the internal crack extension signal of the coal sample 6 to realize the monitoring of the internal crack extension of the coal sample 6.

[0078] During operation, an external force is first applied to the coal sample in the pyrolysis chamber 14 through the servo control device 2 to simulate the ground stress that the coal sample is subjected to during in-situ mining. The pressure controller 21 monitors and adjusts the axial force. Then the microwave controller 11 feeds microwaves into the resonant cavity 13 through the waveguide 12 to realize microwave pyrolysis of the coal sample under external force loading. The temperature measuring device 5 monitors the temperature of the pyrolysis chamber 14 in real time. The monitoring device monitors and analyzes the pyrolysis oil and gas through the oil and gas monitoring component 3, and monitors the internal crack extension signal of the coal sample 6 through the crack monitoring component 4, so as to determine the microwave pyrolysis and fragmentation of the coal sample 6, and obtain the pyrolysis characteristics, mechanical properties and fragmentation characteristics of the coal sample under external force loading during microwave irradiation.

[0079] In some embodiments, crack monitoring assemblies are located at the upper and lower ends of the coal sample 6, as well as within at least one circumferential pressure rod 24. The crack monitoring assemblies include acoustic emission sensors. Optionally, one acoustic emission sensor is provided for each pressure rod in the upper and lower, first, and second directions.

[0080] Specifically, a cavity for installing an acoustic emission sensor is opened at one end of the pressure rod 24 close to the coal sample 6. The acoustic emission sensor is fixedly installed in the cavity, and the side of the cavity facing the coal sample 6 is an open end to ensure that the acoustic emission sensor can contact the coal sample 6.

[0081] In order to avoid the influence of microwaves on the acoustic emission sensor, a shielding layer is provided outside the acoustic emission sensor, and the shielding layer can be a metal mesh.

[0082] In some embodiments, the pressure rod 24 is sealed to the pyrolysis chamber 14 via a sealing assembly 17. The function of the sealing assembly 17 is to ensure that the pyrolysis chamber 14 is in a sealed state when the coal sample 6 is kept under pressure. The sealing assembly 17 includes a first seal 172, a second seal 173, and a third seal 174. The first seal 172, the second seal 173, and the third seal 174 are combined to realize the sealed connection between the pressure rod 24 and the pyrolysis chamber 14. Figure 2-Figure 8 As shown, the first seal 172 and the second seal 173 are both cylindrical, and the third seal 174 is in the shape of a circular plate. The first end of the first seal 172 extends into the pyrolysis chamber 14, and the second end of the first seal 172 is located outside the pyrolysis chamber 14. The first end of the second seal 173 is sleeved on the second end of the first seal 172, and the third seal 174 is set on the end surface of the first end of the second seal 173. The third seal 174 has a mounting hole for the third seal 174 to be sleeved and connected to the pressure rod 24.

[0083] Specifically, a first connecting plate is provided on the first sealing member 172, and the first connecting plate is connected to the resonant cavity 13 by bolts. A second connecting plate is provided at the first end of the second sealing member 173, and the second connecting plate is connected to the first connecting plate by bolts. A third connecting plate is provided at the second end of the second sealing member 173, and the third connecting plate is connected to the third sealing member 174 by a clamp 175.

[0084] The plane where the first connecting plate is located is perpendicular to the axis where the first sealing member 172 is located, and the second connecting plate and the third connecting plate are perpendicular to the axis where the second sealing member 173 is located.

[0085] Optionally, the shape of the third connecting plate is the same as that of the third sealing member 174 . Specifically, the third connecting plate and the third sealing member 174 are both annular, the third connecting plate has a through hole adapted to the shape of the pressure rod 24 , and the outer diameter of the third connecting plate is the same as that of the third sealing member 174 .

[0086] During installation, the first seal 172 is fixed on the resonance cavity 13, and at the same time, the first connecting plate of the first seal 172 supports the pyrolysis cavity 14 to prevent the pyrolysis cavity 14 from falling off from the resonance cavity 13. The second seal 173 and the third seal 174 pass through the pressure rod 24 in turn and are temporarily not fixed; the servo control device 2 applies external force to the coal sample in the pyrolysis cavity 14. After loading is completed, the servo control device 2 is closed and the pressure rod 24 remains stationary; the second seal 173 is slid until the second connecting plate of the second seal 173 is in contact with the first connecting plate of the first seal 172, the first connecting plate and the second connecting plate are connected, and then the third seal 174 is slid to fit with the third connecting plate of the second seal 173, and the second seal 173 and the third seal 174 are connected by the clamp 262 and sealed and fixed on the pressure rod 24.

[0087] like Figure 6 As shown, the first sealing member 172 is provided with a sealing gasket 171 on the outer wall of the pyrolysis chamber 14.

[0088] A sealing gasket 171 is provided on the outer wall where the first sealing member 172 and the second sealing member 173 are in contact with each other and / or on the inner wall where the second sealing member 173 and the first sealing member 172 are in contact with each other.

[0089] A sealing gasket 171 is provided on the side of the first connecting plate that contacts the resonant cavity 13 , and a sealing gasket 171 is provided on the wall of the mounting hole.

[0090] Optionally, the first sealing member 172 , the second sealing member 173 and the third sealing member 174 are all made of metal materials to ensure the strength of the sealing assembly 17 .

[0091] like Figure 1 and Figure 2As shown, the resonance cavity 13 is installed on the reaction frame 22 through a column, so that the resonance cavity 13 is located in the middle of the reaction frame 22 in the vertical direction, which makes it easy for the driving member 23 to drive the pressure rod 24 to apply external force to the coal sample.

[0092] In this solution, the first sealing member 172 and the second sealing member 173 of the sealing assembly 17 for achieving a sealed connection between the pressure rod 24 at the upper end of the coal sample 6 and the pyrolysis chamber 14 are sleeved and connected at a position where a first mounting hole for mounting the gas outlet pipe 16 is provided.

[0093] In this solution, the first seal 172 and the second seal 173 of the sealing assembly 17 are sleeved and connected to achieve the sealing connection between the pressure rod 24 located at the lower end or circumference of the coal sample 6 and the pyrolysis chamber 14, and a second mounting hole for mounting the air intake pipe 15 is set.

[0094] The air inlet pipe 15 and the air outlet pipe 16 may also be directly arranged on the pyrolysis chamber 14 .

[0095] In order to reduce heat loss in the pyrolysis chamber 14, a heat-insulating structure is optionally provided on the pyrolysis chamber 14. The heat-insulating structure on the pyrolysis chamber 14 can be a heat-insulating layer 18 or a heat-insulating cavity provided outside the pyrolysis chamber 14.

[0096] In the embodiment where the thermal insulation layer 18 is provided on the pyrolysis chamber 14 , the thermal insulation layer 18 may be a microwave-transparent thermal insulation layer, and the microwave-transparent thermal insulation layer includes but is not limited to a ceramic fiber thermal insulation layer.

[0097] In some embodiments, a groove is provided on one side of the insulation layer 18 near the pyrolysis chamber 14, and the temperature measuring device 5 is installed in the groove. The temperature measuring device 5 is installed in the groove of the insulation layer 18 to measure the temperature of the coal sample 6 without contacting the coal sample 6.

[0098] In this solution, a space for separately installing the temperature measuring device 5 is set on the insulation layer 18. In addition to having the insulation function, the insulation layer 18 also provides an installation base for the temperature measuring device 5. The notch of the groove faces the pyrolysis chamber 14. The temperature measuring device 5 measures the real-time temperature of the surface of the coal sample 6 during the experiment.

[0099] A metal mesh is provided in the groove and is arranged around the circumference of the temperature measuring device. The metal mesh is used to shield the microwaves generated by the waveguide 12 and reduce the impact of the microwaves on the temperature measuring device. The metal mesh can be directly coated on the temperature measuring device or fixedly or detachably connected to the groove wall of the groove.

[0100] Optionally, the temperature measuring device 5 is at least one of an infrared thermometer and a thermal imager.

[0101] In some embodiments, the oil and gas monitoring assembly 3 includes an atmosphere bottle 31, a condensation collection bottle 32, a water washing bottle 33, a drying bottle 34, a gas collecting bottle 35 and a gas analyzer 36, wherein the atmosphere bottle 31 is connected to the air inlet and is used to fill the pyrolysis chamber 14 with atmosphere gas to ensure the safety of the pyrolysis process, the condensation collection bottle 32, the water washing bottle 33, the drying bottle 34 and the gas collecting bottle 35 and the gas analyzer 36 are connected in series in sequence, the condensation collection bottle 32 is connected to the outlet pipe 16 of the pyrolysis chamber 14, and the oil and gas generated in the pyrolysis chamber 14 pass through the condensation collection bottle 32 in sequence. , water washing bottle 33, drying bottle 34 and gas collecting bottle 35. A cooling component is provided on the condensation collecting bottle 32. After the oil and gas generated by microwave pyrolysis pass through the condensation collecting bottle 32, the oil is cooled and collected in the condensation collecting bottle 32. The separated gas passes through the water washing bottle 33 and the drying bottle 34 in turn. The water washing bottle 33 removes impurities in the gas, and the drying bottle 34 dries the gas after passing through the water washing bottle 33. Finally, it is collected in the gas collecting bottle 35 to obtain pure and dry gas, and the gas collected in the gas collecting bottle 35 is analyzed in real time by the gas analyzer 36.

[0102] Optionally, there are multiple condensate collection bottles 32 , and the multiple condensate collection bottles 32 are arranged in series to enhance the oil recovery effect.

[0103] The gas analyzer 36 is a gas chromatograph or a coal gas analyzer.

[0104] A mass flowmeter 39 is installed on the inlet pipe 15, and a mass flowmeter 39 is also installed between the drying bottle 34 and the gas collecting bottle 35. These two mass flowmeters work together to monitor the volume of gas generated by pyrolysis. A barometer 30 is installed on the outlet pipe 16 to monitor the gas pressure and cooperate with the mass flowmeter 39 to ensure the release of pyrolysis oil and gas.

[0105] In order to prevent the oil and gas from condensing in the pipeline before entering the condensation collection bottle 32, this solution provides a heating tape 37 on the pipeline connecting the condensation collection bottle 32 and the outlet pipe 16 to heat the oil and gas in the pipeline so that the condensation of the oil occurs in the condensation collection bottle 32 as much as possible, thereby reducing pipeline blockage.

[0106] In some embodiments, the cooling assembly includes a chiller 38 and a cold water pipe. The chiller 38 is used to provide cooling liquid to the cold water pipe. A portion of the cold water pipe is located in the resonance cavity 13 to reduce the temperature of the resonance cavity 13. The other portion of the cold water pipe is connected to the condenser pipe of the condensation collection bottle 32 to cool the oil in the pyrolysis oil and gas in the condensation collection bottle 32, condense and separate the pyrolysis oil and gas, and the condensation collection bottle 32 collects the condensed oil.

[0107] In some embodiments, the cooling assembly has two cold water pipes, one of which is located in the resonance cavity 13 and is used to cool the resonance cavity 13 when the temperature of the resonance cavity 13 exceeds a preset temperature, so as to reduce the temperature of the resonance cavity 13 to a preset temperature; the other cold water pipe is connected to the condenser pipe of the condensation collection bottle 32, and the coolant in the cold water pipe is used to condense and separate the pyrolysis oil and gas, and the condensation collection bottle 32 collects the condensed oil.

[0108] In some embodiments, the cooling assembly has a cold water pipe, a portion of which is located in the resonance cavity 13 and is used to cool the resonance cavity 13 so that the temperature of the resonance cavity 13 is maintained at a preset temperature. The other portion of the cold water pipe is connected to the condenser pipe of the condensation collection bottle 32. The coolant in the cold water pipe is used to condense and separate the pyrolysis oil and gas, and the condensation collection bottle 32 collects the condensed oil.

[0109] like Figure 1 As shown, the chiller 38 has an outlet pipe and a return pipe. One end of the outlet pipe is connected to the chiller 38, and the other end is connected to the lower end of the cold water pipe. One end of the return pipe is connected to the chiller 38, and the other end is connected to the upper end of the cold water pipe. Two adjacent condensate collection bottles 32 are connected by a connecting pipe, one end of which is connected to the upper end of the cold water pipe, and the other end is connected to the lower end of the cold water pipe. This arrangement allows cold water to flow from the bottom of the cold water pipe to the top of the cold water pipe, in the opposite direction of the movement of the generated pyrolysis oil and gas within the condensate collection bottle 32, which can enhance the cooling effect of the cooling component on the pyrolysis oil and gas.

[0110] When the microwave fragmentation pyrolysis in-situ mining simulation experimental system of oil-rich coal of the present invention is used:

[0111] First, install the specimen and experimental device:

[0112] The insulation layer 18, the temperature measuring device 5 and the pyrolysis chamber 14 are sequentially placed in the resonance chamber 13. The first sealing member 172 is fixed on the resonance chamber 13 to prevent the pyrolysis chamber 14 from falling off. The second sealing member 173 and the third sealing member 174 pass through the pressure rod 24 in sequence but are not fixed.

[0113] The pressure rod 24 at the upper end of the pyrolysis chamber 14 is raised, and the coal sample 6 is placed on the pressure rod 24 at the lower end of the pyrolysis chamber 14. The servo control device 2 is started, so that the pressure rods 24 at the upper end of the pyrolysis chamber 14, the pressure rods 24 at the lower end of the pyrolysis chamber 14, and the pressure rods 24 located around the coal sample 6 apply load to the coal sample 6 at a certain loading rate. After loading is completed, the servo control device 2 is turned off to keep the pressure rods 24 stationary.

[0114] Slide the second seal 173 to connect with the first seal 172 and seal it with the gasket 171. Then slide the third seal 174 to connect with the second seal 173 and seal it with the gasket 171. At the same time, use the clamp 175 to seal the third seal 174 and the second seal 173 to the pressure rod 24.

[0115] Connect the air inlet pipe 15 to the atmosphere bottle 31, and the air outlet pipe 16 to the condensation collection bottle 32;

[0116] Next, check the airtightness of the device:

[0117] Introduce atmosphere gas, adjust the valve of the atmosphere bottle 31, and observe the pressure gauge 42 to maintain a slightly positive pressure in the pyrolysis chamber 14; check the airtightness. If no bubbles are generated in the water washing bottle 33, reinstall the sealing assembly 17 and check the airtightness again. If bubbles are generated in the water washing bottle 33, the airtightness of the device is good;

[0118] Again, conventional microwave fragmentation experiment:

[0119] After the airtightness check is passed, continue purging for 10 minutes and then start the chiller 38, and then start the microwave controller 11 to control the microwave power and irradiation time;

[0120] During the experiment, the pressure controller 21 monitors the change of the axial force over time, and the temperature measuring device 5 monitors the real-time temperature. The experiment ends;

[0121] Again: Microwave pyrolysis fragmentation experiment:

[0122] After the airtightness check is passed, continue purging for 10 minutes, then start the chiller 38 and the electric heating cable 37, then start the microwave controller 11 to set the microwave power and irradiation time, and at the same time reset the flow meter 46;

[0123] During the experiment, the pressure controller 21 monitors the change of the axial force over time, the temperature measuring device 5 monitors the real-time temperature, and the condensation collection bottle 32 collects the liquid product, and the collection bottle 49 collects the pyrolysis oil and gas;

[0124] Finally: End the experiment:

[0125] Turn off the servo control device 2 and the microwave pyrolysis device 1, and close the valve and the chiller 38;

[0126] Experimental analysis: Based on the pyrolysis and fragmentation experimental data (including data from conventional microwave fragmentation experiments and microwave pyrolysis and fragmentation experiments), the pyrolysis liquid and gas precipitation patterns of coal sample 6 under different stress conditions and different microwave conditions, as well as the damage and fragmentation effects of solid products, were obtained. For example, when comparing the effects of stress, the stress conditions were variables, and other parameters (such as microwave conditions) remained unchanged.

[0127] In some embodiments, the coolant is anhydrous ethanol, the cooling temperature is -15°C to -5°C, the liquid in the water washing bottle 33 is distilled water, and the desiccant in the drying bottle 34 is a silica gel desiccant.

[0128] In order to comply with rock mechanics testing standards and to ensure that the properties of coal sample 6 are consistent with those of the actual pyrolysis object material, coal sample 6 is a coal rock with a regular shape and integrity.

[0129] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed, and is not intended to limit the present application. For those skilled in the art, various modifications and variations of the present application are possible. The scope of application involved in the present application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned application concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal, characterized in that: It comprises a microwave pyrolysis device (1), a servo control device (2), a monitoring device and a temperature measuring device (5), The microwave pyrolysis device (1) comprises a microwave controller (11), a waveguide (12), a resonant cavity (13) and a pyrolysis cavity (14); the microwave controller (11) feeds microwaves into the resonant cavity (13) through the waveguide (12); the pyrolysis cavity (14) is arranged in the resonant cavity (13); the coal sample (6) is pyrolyzed by microwaves in the pyrolysis cavity (14); the temperature measuring device (5) is arranged in the pyrolysis cavity (14) for measuring the temperature of the coal sample (6) in the pyrolysis cavity (14); The servo control device (2) includes a pressure controller (21), a reaction frame (22), a driving member (23) and a pressure rod (24), wherein the pressure controller (21) is used to control and monitor the pressure of the driving member (23), the driving member (23) is mounted on the reaction frame (22), the driving member (23) is used to drive the pressure rod (24) to apply pressure to the coal sample (6), the pyrolysis chamber (14) is provided with the pressure rod (24) corresponding to the upper end and the lower end of the coal sample (6), and at least one circumferential direction, the pressure rod (24) is located in the pyrolysis chamber (14) and is sealed with the pyrolysis chamber (14), and the pressure rod (24) is made of microwave-transparent material. The monitoring device is used to monitor the pyrolysis and fragmentation of the coal sample (6), and includes an oil and gas monitoring component (3) and a crack monitoring component (4). The oil and gas monitoring component (3) is connected to the gas outlet pipe (16) of the pyrolysis chamber (14) and is used to monitor and collect the oil and gas generated by the pyrolysis of the coal sample (6). The crack monitoring component (4) is used to monitor and record the internal crack extension signal of the coal sample (6).

2. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 1 is characterized in that: The pressure rods (24) are arranged at three circumferential positions of the coal sample (6), wherein the pressure rods (24) at two of the positions are located in a first direction, and the pressure rod (24) at another position is located in a second direction, and the waveguide (12) is located in the second direction and is opposite to the pressure rod (24) located in the second direction; The first direction is perpendicular to the second direction, and the first direction is perpendicular to the vertical direction.

3. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 1 is characterized in that: The pressure rods (24) are arranged at four circumferential positions of the coal sample (6), wherein the pressure rods (24) at two of the positions are located in a first direction, and the pressure rods (24) at the other two positions are located in a second direction; The first direction is perpendicular to the second direction, and the first direction is perpendicular to the vertical direction.

4. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 2 or 3, characterized in that: The microwave pyrolysis device (1) further comprises a distance adjustment component (19), wherein the waveguide (12) is connected to the resonant cavity (13) via the distance adjustment component (19), and is used to adjust the distance between the waveguide (12) and the pyrolysis cavity (14).

5. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 1 is characterized in that: The oil and gas monitoring assembly (3) includes an atmosphere bottle (31), a condensation collection bottle (32), a water washing bottle (33), a drying bottle (34), a gas collecting bottle (35) and a gas analyzer (36). The atmosphere bottle (31) is connected to the air inlet pipe (15) of the pyrolysis chamber (14) and is used to introduce atmosphere gas into the pyrolysis chamber (14). The condensation collection bottle (32), the water washing bottle (33), the drying bottle (34), the gas collecting bottle (35) and the gas analyzer (36) are connected in sequence. The inlet of the condensation collection bottle (32) is connected to the air outlet pipe (16). A cooling component is provided on the condensation collection bottle (32). The condensation collection bottle (32) is used to collect oil in the pyrolysis oil and gas. The water washing bottle (33) is used to remove impurities in the pyrolysis oil and gas. The drying bottle (34) is used to remove moisture in the pyrolysis oil and gas. The gas collecting bottle (35) is used to collect gas in the pyrolysis oil and gas. The gas analyzer (36) is used to monitor and analyze the pyrolysis gas.

6. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 5 is characterized in that: The oil and gas monitoring assembly (3) further includes a heating tape (37), which is arranged at one end of the condensation collection bottle (32) close to the gas outlet pipe (16) to prevent the oil and gas from condensing and blocking the pipeline.

7. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 5 is characterized in that: The cooling assembly includes a water chiller (38) and a cold water pipe, wherein the water chiller (38) is used to provide cooling liquid to the cold water pipe, a portion of the cold water pipe is located in the resonance cavity (13) and is used to reduce the temperature of the resonance cavity (13), and another portion of the cold water pipe is connected to the condensation pipe of the condensation collection bottle (32) and is used to cool the oil in the pyrolysis oil gas in the condensation collection bottle (32).

8. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 5 is characterized in that: The oil and gas monitoring assembly (3) further includes a mass flow meter (39) and a pressure gauge (30); The mass flow meter (39) is arranged between the atmosphere bottle (31) and the air inlet pipe (15), and between the drying bottle (34) and the gas collecting bottle (35), and is used to monitor the volume of the gas generated by pyrolysis; The pressure gauge (30) is arranged between the gas outlet pipe (16) and the condensation collection bottle (32) to monitor the gas pressure and cooperates with the mass flow meter (39) to ensure the separation of pyrolysis oil and gas.

9. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 1 is characterized in that: The crack monitoring assembly (4) is arranged at the upper end and the lower end of the coal sample (6), and within at least one of the circumferential pressure rods (24); The crack monitoring component (4) includes an acoustic emission sensor.

10. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 1 is characterized in that: The pressure rod (24) is sealed and connected to the pyrolysis chamber (14) via a sealing assembly (17). The sealing assembly (17) includes a first sealing member (172), a second sealing member (173) and a third sealing member (174). The first end of the first sealing member (172) extends into the pyrolysis chamber (14), the second end of the first sealing member (172) is located outside the pyrolysis chamber (14), the first end of the second sealing member (173) is sleeved on the second end of the first sealing member (172), the end surface of the second end of the second sealing member (173) is provided with the third sealing member (174), and the third sealing member (174) has a mounting hole for sleeve-connecting the third sealing member (174) and the pressure rod (24). A first connecting plate is provided on the first sealing member (172), and the first connecting plate is connected to the resonant cavity (13) via bolts. A second connecting plate is provided at the first end of the second sealing member (173), and the second connecting plate is connected to the first connecting plate by bolts. A third connecting plate is provided at the second end of the second sealing member (173), and the third connecting plate is connected to the third sealing member (174) via a clamp (175). The first sealing member (172) is provided with a sealing gasket (171) on the outer wall of the pyrolysis chamber (14). A sealing gasket (171) is provided on the outer wall where the first sealing member (172) and the second sealing member (173) are in contact with each other and / or on the inner wall where the second sealing member (173) and the first sealing member (172) are in contact with each other. A sealing gasket (171) is provided on the side of the first connecting plate that is in contact with the resonant cavity (13), and a sealing gasket (171) is provided on the hole wall of the mounting hole.

11. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 10, characterized in that: A first mounting hole for mounting the gas outlet pipe (16) is provided at a position where the first sealing member (172) and the second sealing member (173) of the sealing assembly (17) located at the upper end of the coal sample (6) are sleeved and connected; or, A second mounting hole for mounting the air inlet pipe (15) of the pyrolysis chamber (14) is provided at a position where the first sealing member (172) and the second sealing member (173) of the sealing assembly (17) are sleeved and connected at the lower end or circumference of the coal sample (6).

12. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 1 is characterized in that: A thermal insulation layer (18) is provided outside the pyrolysis chamber (14), and the thermal insulation layer (18) is a ceramic fiber thermal insulation layer.

13. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 12, characterized in that: A groove for mounting the temperature measuring device (5) is provided on one side of the heat-insulating layer (18) close to the pyrolysis chamber (14), and a metal mesh is provided around the groove. The metal mesh is used to shield the microwaves to reduce the influence of the microwaves on the temperature measuring device (5).

14. The in-situ mining simulation experimental system for microwave fragmentation and pyrolysis of oil-rich coal according to claim 1, characterized in that: The temperature measuring device (5) is at least one of an infrared thermometer and a thermal imager.

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