Radio frequency heating oil-rich coal in-situ pyrolysis simulation test device and method

Abstract

The invention discloses a radio frequency heating oil-rich coal in-situ pyrolysis simulation test device and method in the technical field of oil-rich coal in-situ pyrolysis, the test device comprises a sealing tank and a computer, a plurality of limiting plates are arranged in the sealing tank, and a plurality of gas storage assemblies are arranged between the limiting plates and the sealing tank; an injection chamber for filling a microwave absorbent is arranged between every two adjacent gas storage assemblies; a plurality of pressure sensors for measuring pressure data are arranged on one side, far away from the sealing tank, of the limiting plate; the center of the bottom of the sealing tank is fixedly connected with a radio frequency transmitter for transmitting high-frequency electromagnetic waves; the top of the sealing tank is detachably connected with a tank door, and the tank door is provided with geological thermomanometers used for detecting temperature change data and an ultrasonic detection system used for detecting crack development information, wherein the geological thermomanometers and the ultrasonic detection system are alternately arranged. The simulation of the geological environment of the oil-rich coal sample is realized, and the experimental data of the microwave absorbent on the pyrolysis of the oil-rich coal sample under different radio frequency heating temperature conditions in the pyrolysis process of the oil-rich coal sample can be conveniently observed.

Description

Technical Field

[0001] The invention belongs to the technical field of in-situ pyrolysis of oil-rich coal, and in particular is a radio frequency heating in-situ pyrolysis simulation test device and method for oil-rich coal. Background Art

[0002] In-situ pyrolysis technology for oil-rich coal refers to the process of achieving pyrolysis of coal in-situ underground by drilling, artificial seams, injection of heat media, construction of underground pyrolysis furnaces, etc., so as to extract resources such as coal tar and gas. In this process, coal is heated to a certain temperature under air-tight conditions, and pyrolysis reaction occurs, producing liquid and gaseous products, and pyrolysis semi-coke, realizing efficient and low-carbon utilization of coal resources.

[0003] In actual use, the in-situ pyrolysis technology of oil-rich coal often involves many aspects, such as the selection and optimization of coal seam heating methods, the control of pyrolysis temperature, the selection and application of reservoir transformation technology, the efficient extraction of pyrolysis oil and gas, and the balance between economic and environmental benefits. Therefore, simulation experiments are often used in the prior art to verify the feasibility under different conditions (such as the temperature and flow rate of the heating medium) to observe the effects of these parameters on the pyrolysis process, thereby optimizing the process parameters and improving the pyrolysis efficiency and coal tar yield.

[0004] Among them, the heating method is one of the key factors of the in-situ pyrolysis technology of oil-rich coal. The heating method can be divided into: conduction heating, convection heating, radiation heating and chemical heating according to the heating principle; conduction heating uses the direct contact of the medium to heat, which is simple to control but has low heat transfer efficiency and is greatly affected by groundwater; convection heating uses fluid injection to heat, which heats up quickly but is prone to subsequent leakage pollution; chemical heating heats through the oxidation reaction of organic matter, which has a fast heating speed but is difficult to control the oxidation process, affecting subsequent heating. The radiation heating method directly uses the alternating electric field based on high-frequency electromagnetic wave radiation to heat the coal seam, which has the characteristics of high heating efficiency, but the low dielectric constant of the mineral components in the coal will inhibit the microwave absorption capacity, and microwave absorbers need to be added to obtain the ideal heating effect. Therefore, the present invention provides a test device that simulates the geological conditions corresponding to the oil-rich coal sample to determine the influence of microwave absorbers on the pyrolysis effect of the oil-rich coal sample under different radio frequency heating temperature conditions. Summary of the invention

[0005] The purpose of the present invention is to provide a radio frequency heating in-situ pyrolysis simulation test device and method for oil-rich coal, so as to simulate the geological environment of the oil-rich coal sample and facilitate the observation of experimental data of the pyrolysis of the oil-rich coal sample by microwave absorbers under different radio frequency heating temperature conditions during the pyrolysis of the oil-rich coal sample.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A radio frequency heating oil-rich coal in-situ pyrolysis simulation test device comprises a sealed tank and a computer, a plurality of limit plates are arranged in the sealed tank, a plurality of gas storage components are arranged between the limit plates and the sealed tank, and an injection chamber for loading a microwave absorbent is arranged between adjacent gas storage components;

[0008] A plurality of pressure sensors are arranged on the side of the limit plate away from the sealed tank, and the center of the limit plate is connected to the gas storage assembly. The pressure sensors are used to measure the pressure data of the oil-rich coal sample in the sealed tank on each limit plate, and send the pressure data to the computer;

[0009] A radio frequency transmitter for transmitting high-frequency electromagnetic waves is fixedly connected to the center of the bottom of the sealed tank, and the radio frequency transmitter is electrically connected to the computer;

[0010] The top of the sealed tank is detachably connected to a tank door, on which geological thermometers and ultrasonic detection systems are arranged alternately. The geological thermometers and ultrasonic detection systems are used to detect temperature change data and simulated pressure data of the oil-rich coal sample in the sealed tank, and send the temperature change data and simulated pressure data to a computer; the ultrasonic detection system is used to detect crack development information of the oil-rich coal sample before and after pyrolysis, and send the crack development information to a computer;

[0011] The computer is used to control the working parameters of the radio frequency transmitter, and record and store the microwave absorber, pressure data, temperature change data, simulated pressure data and crack development information corresponding to each working parameter.

[0012] The following beneficial effects are achieved by adopting the above scheme:

[0013] In the initial state, the gaps between the limiting plates are filled with microwave absorbent to form a sealed environment to meet the experimental needs.

[0014] The volatiles and gas products produced during the pyrolysis of the oil-rich coal sample push the limit plate to move, and the volatiles and gas products enter the gas storage assembly to control the changes in the injection chamber, and cracks will form in the oil-rich coal sample, allowing the microwave absorber to automatically enter the cracks for observation. This reduces the steps of manual continuous addition, so as to determine the experimental parameters of the effect of microwave absorbers on oil-rich coal samples under different conditions.

[0015] At the same time, by adding microwave absorbent to seal the inside of the limit plate, a gap is formed to provide space for the movement of the limit plate, so as to increase the internal pressure for subsequent release, thereby reducing the direct pressure of the sealing tank and extending the service life of the device.

[0016] Furthermore, a first shaft and a second shaft are fixedly connected to both sides of the limiting plate, and the first shaft and the second shaft are symmetrically arranged with the limiting plate as the center. The first shaft rotates with the tank door and the sealed tank respectively; and corresponding sliding grooves are opened on the sealed tank and the tank door, and the second shaft slides with the sliding grooves.

[0017] Beneficial effect: The second shaft is rotationally limited by the slide groove, so that the rotation of the limit plate is more stable, so as to control the opening size between adjacent limit plates, and allow the microwave absorbent to enter the oil-rich coal sample along the gap between the limit plates.

[0018] Furthermore, a plurality of filling ports are provided on the sealing tank, the positions of the filling ports correspond to the intersections of adjacent limit plates, and baffles are provided on both sides of the filling ports, one end of the baffle is rotatably matched with the sealing tank, and the other end of the baffle is fixedly connected with a hook; and a card block is slidably matched in the filling port, the card block is fixedly connected with the sealing tank bolts, and a V-shaped limit block is fixedly connected to the side of the card block close to the baffle, and the limit block is against the hook.

[0019] Beneficial effects: The baffle is used to block the leakage of the internal microwave absorbent during the simulation experiment, and the limit block is used to restrict the hook to fix the baffle to form a stable support during the simulation experiment; while facilitating the subsequent addition of the microwave absorbent, the double obstruction formed by the baffle and the block improves the airtightness of the sealed can.

[0020] Furthermore, the shape of adjacent limiting plates is petal-shaped, and the adjacent limiting plates abut against each other.

[0021] Beneficial effect: By staggered arrangement of petal-shaped limiting plates, the oil-rich coal in the center is squeezed and fitted to reduce the air inside the oil-rich coal; at the same time, it is convenient for subsequent microwave absorbers to enter the oil-rich coal sample along the gaps opened between the limiting plates.

[0022] Furthermore, the gas storage assembly includes a gas tank connected to the limit plate, and the gas tank is fixedly connected to the center of the limit plate; a piston assembly is provided on one side of the gas tank;

[0023] The piston assembly includes a sleeve connected to the gas tank, a piston is slidably fitted in the sleeve, a push plate is hingedly connected to one end of the piston away from the sleeve, the push plate is located between the limit plate and the sealing tank, a cavity is provided between the push plate and the gas tank, and pressure relief valves are evenly arranged in the sleeve, and the pressure relief valves are connected to the cavity;

[0024] When the push plate moves to the farthest end, two sides of the push plate abut against the limit plates or the sealing tank respectively, and the adjacent limit plates abut against each other.

[0025] Beneficial effect: Through the evenly arranged pressure relief valves, during the gradual movement of the piston, the pressure accumulated inside the gas tank is reduced through the gradually connected pressure relief valves, and the gas is injected into the cavity for filling to support the push plate, thereby reducing the resetting of the push plate.

[0026] When the push plate is not extended, the adjacent limiting plates are not restricted, providing conditions for the microwave absorber to enter the oil-rich coal sample. When the push plate moves to the farthest end, the gap between the adjacent limiting plates is reduced to reduce the microwave absorber from being affected by the gas in the pyrolysis process and flowing back, thereby ensuring that the microwave absorber enters the interior of the oil-rich coal sample.

[0027] Furthermore, a plurality of connecting holes are opened on the sealing tank, which correspond to the positions of the gas tank, and the top of the gas tank and the sealing tank are gap-matched; and a blocking plate is slidingly matched inside the gas tank, and a push-pull rod is hinged on the side of the blocking plate away from the limit plate, and the push-pull rod is threadedly connected to the airtight rod.

[0028] Beneficial effects: The blocking plate is moved inside the gas tank to adjust the initial pressure inside the gas tank, so as to control the continuous opening time of the limit plate, and then control the entry amount of the microwave absorbent; at the same time, the blocking plate blocks the limit plate, so that the upper part of the gas tank is connected with the sleeve, and then the push plate is controlled to support and hold the oil-rich coal sample between the limit plates, so as to achieve compression of the oil-rich coal sample.

[0029] Furthermore, a circular partition is threadedly connected to the tank door, and the partition is arranged circumferentially with the radio frequency transmitter as the center.

[0030] Beneficial effects: The radio frequency transmitter is protected by the partition during the compression of the oil-rich coal sample to reduce the squeezing of the radio frequency transmitter. At the same time, the withdrawal of the partition provides a working space for the radio frequency transmitter to extend the working time of the radio frequency transmitter.

[0031] Furthermore, a rubber gasket seal is provided between the gas tank, the clamping block, the push-pull rod and the sealing tank.

[0032] Beneficial effect: The rubber pad improves the air tightness between the inside and the outside to form a closed space to simulate the natural environment.

[0033] Further, a radio frequency heating oil-rich coal in-situ pyrolysis simulation test method, according to the test method of the radio frequency heating oil-rich coal in-situ pyrolysis simulation test device, comprises the following steps: step 1, collecting oil-rich coal samples, and recording geological information corresponding to the oil-rich coal samples, the geological information including coal seam temperature information, coal seam pressure information, coal seam gas information and basic parameters of oil-rich coal, the basic parameters of oil-rich coal including thermal conductivity, thermal diffusivity and dielectric constant;

[0034] Step 2: Load the oil-rich coal sample into a sealed tank, and control the limit plate to squeeze the oil-rich coal sample based on the simulated pressure data, while keeping the temperature change data in the sealed tank consistent with the coal seam temperature information, and then keep the simulated pressure data consistent with the coal seam pressure;

[0035] Step 3: Based on the basic parameters of the oil-rich coal, a microwave absorber with a high dielectric constant is selected, the gap between the limit plate and the sealing tank is filled with the microwave absorber, and based on the coal seam gas information, a gas is selected to perform air compression filling on the oil-rich coal sample;

[0036] Step 4: Start the radio frequency transmitter to emit high-frequency electromagnetic waves to heat the oil-rich coal sample, and record the pressure data, temperature change data, simulated pressure data and crack development information during the pyrolysis of the oil-rich coal through a computer.

[0037] Beneficial effects: Through the basic collection of geological information, the simulation of the geological environment is realized to generate the initial geological conditions. By changing the heating temperature of the microwave absorber and the radio frequency transmitter, the pyrolysis effect under different conditions is confirmed to understand the influence of different factors on the heating effect.

[0038] At the same time, the sealing effect of the oil-rich coal sample is enhanced by sealing with microwave absorbent, and the thermal expansion coefficient and gas generation of the oil-rich coal sample during the pyrolysis process are used to control the addition of microwave absorbent to the oil-rich coal sample, so as to determine the influence of microwave absorbent on the pyrolysis effect of the oil-rich coal sample, in order to understand the influencing factors and the entire process of in situ pyrolysis of oil-rich coal under radio frequency heating.

[0039] Further, in step three, the microwave absorbent includes but is not limited to coke powder and iron-based catalyst.

[0040] Beneficial effects: Coke powder and iron-based catalyst help absorb microwaves and electromagnetic waves to enhance heating effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is an axonometric diagram of a radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to an embodiment of the present invention.

[0042] Figure 2 for Figure 1 Axonometric view of the sealing tank.

[0043] Figure 3 for Figure 1 A top cross-sectional view of a sealed tank.

[0044] Figure 4 for Figure 1 Schematic diagram of the tank door.

[0045] Figure 5 for Figure 3 An enlarged view of part A.

[0046] Among them, the figure marks in the drawings of the specification include: sealing tank 1, filling port 11, connecting hole 12, tank door 2, partition 21, slide 22, geological thermometer and pressure gauge, limit plate 3, first axis 31, second axis 32, radio frequency transmitter 4, gas tank 5, push-pull rod 51, sleeve 52, pressure relief valve 53, push plate 6, block 7, limit block 71, baffle 72, hook 73, injection chamber 8. DETAILED DESCRIPTION

[0047] The following is further described in detail through specific implementation methods:

[0048] The embodiment is basically as shown in the attached Figures 1 to 5 As shown: a radio frequency heating oil-rich coal in-situ pyrolysis simulation test device, including a sealed tank 1 and a computer (not shown in the figure), a plurality of limit plates 3 are arranged in the sealed tank 1, and a radio frequency transmitter 4 for transmitting high-frequency electromagnetic waves is welded at the center of the bottom of the sealed tank 1, and the radio frequency transmitter 4 is electrically connected to the computer; the top of the sealed tank 1 is detachably connected to a tank door 2, and the tank door 2 is provided with a geological thermometer and an ultrasonic detection system arranged alternately. The first axis 31 and the second axis 32 are welded on both sides of the limit plate 3, respectively, and the first axis 31 and the second axis 32 are symmetrically arranged with the limit plate 3 as the center, and the first axis 31 is respectively rotatably matched with the tank door 2 and the sealed tank 1; and the sealed tank 1 and the tank door 2 are both provided with corresponding slide grooves 22, and the second axis 32 is slidably matched with the slide grooves 22. And the shape of adjacent limit plates 3 is petal-shaped, and adjacent limit plates 3 are against each other.

[0049] A plurality of filling ports 11 are provided on the sealed tank 1, and the positions of the filling ports 11 correspond to the intersections of the adjacent limit plates 3, and baffles 72 are provided on both sides of the filling ports 11, one end of the baffle 72 is rotatably matched with the sealed tank 1, and the other end of the baffle 72 is fixedly connected with a hook 73; and a clamping block 7 is slidably matched in the filling port 11, and the clamping block 7 is fixedly connected to the sealed tank 1 with bolts, and a V-shaped limit block 71 is fixedly connected to the side of the clamping block 7 close to the baffle 72, and the limit block 71 is abutted against the hook 73.

[0050] Several gas storage components are arranged between the limit plate 3 and the sealed tank 1. The gas storage components include a gas tank 5 connected to the limit plate 3, and the gas tank 5 is welded to the center of the limit plate 3; a piston component is arranged on one side of the gas tank 5; the piston component includes a sleeve 52 connected to the gas tank 5, a piston is slidably fitted in the sleeve 52, and a push plate 6 is hinged at one end of the piston away from the sleeve 52, the push plate 6 is located between the limit plate 3 and the sealed tank 1, a cavity is arranged between the push plate 6 and the gas tank 5, and pressure relief valves 53 are evenly arranged in the sleeve 52, and the pressure relief valves 53 are connected to the cavity; when the push plate 6 moves to the farthest end, the two sides of the push plate 6 are respectively against the limit plate 3 or the sealed tank 1, and the adjacent limit plates 3 are against each other. An injection chamber 8 for filling microwave absorbent is arranged between adjacent gas storage components.

[0051] The sealed tank 1 is also provided with a plurality of connection holes 12, which correspond to the positions of the gas tank 5, and the top of the gas tank 5 is in clearance with the sealed tank 1; and a blocking plate 72 is slidably fitted in the gas tank 5, and a push-pull rod 51 is hinged on the side of the blocking plate 72 away from the limit plate 3, and the push-pull rod 51 is threadedly connected to the gas-tight rod. A circular partition 21 is threadedly connected to the tank door 2, and the partition 21 is arranged circumferentially with the radio frequency transmitter 4 as the center.

[0052] A plurality of pressure sensors are provided on the side of the limit plate 3 away from the sealed tank 1. The center of the limit plate 3 is connected to the gas storage assembly. The pressure sensors are used to measure the pressure data of the oil-rich coal sample in the sealed tank 1 on each limit plate 3 and send the pressure data to the computer.

[0053] The geological thermometer and pressure gauge is used to detect the temperature change data and simulated pressure data of the oil-rich coal sample in the sealed tank 1, and send the temperature change data and simulated pressure data to the computer; the ultrasonic detection system is used to detect the crack development information of the oil-rich coal sample before and after pyrolysis, and send the crack development information to the computer; the computer is used to control the working parameters of the radio frequency transmitter 4, record and store the microwave absorber, pressure data, temperature change data, simulated pressure data and crack development information corresponding to each working parameter.

[0054] A radio frequency heated in-situ pyrolysis simulation test method for oil-rich coal comprises the following steps: Step 1, collecting oil-rich coal samples and recording geological information corresponding to the oil-rich coal samples, the geological information including coal seam temperature information, coal seam pressure information, coal seam gas information and basic parameters of the oil-rich coal, the basic parameters of the oil-rich coal including thermal conductivity, thermal diffusion coefficient and dielectric constant.

[0055] Step 2: Load the oil-rich coal sample between the limit plates 3 in the sealed tank 1, and control the limit plates 3 to squeeze the oil-rich coal sample based on the simulated pressure data. First, place the partition 21 on the tank door 2 around the radio frequency transmitter 4 and fill the oil-rich coal sample. Then move the blocking plate 72 inside the gas tank 5, remove the push-pull rod 51 to connect the upper part of the gas tank 5 with the sleeve 52, and make the push plate 6 located between the limit plates 3 and the sealed tank 1 for support, so that the limit plates 3 are squeezed and compressed toward the center, and the radio frequency transmitter 4 is protected by the partition 21. After the oil-rich coal sample is loaded, fix the tank door 2 on the sealed tank 1, and thread the partition 21 to the tank door 2. At the same time, heat it through the geological thermometer and radio frequency transmitter 4 to keep the temperature change data in the sealed tank 1 consistent with the coal seam temperature information, and then keep the simulated pressure data consistent with the coal seam pressure.

[0056] Step 3: Based on the basic parameters of oil-rich coal, a microwave absorbent with a high dielectric constant is selected, and the microwave absorbent includes but is not limited to coke powder and iron-based catalyst; before installing the tank door 2, remove the block 7 along the junction of the sealed tank 1 and the tank door 2, remove the baffle 72, and inject the microwave absorbent to fill the gap between the limit plate 3 and the sealed tank 1. After filling, close the baffle 72, and limit the scraper hook by inserting the limit block 71 of the block 7 to fix the baffle 72 to form a stable support during the simulation experiment; while facilitating the subsequent addition of microwave absorbent, the double obstruction formed by the baffle 72 and the block 7 improves the airtightness of the sealed tank 1, and then seals the sealed tank 1 through the tank door 2. Based on the coal seam gas information, select gas to be sucked through the connecting hole 12 for negative pressure to reduce the internal residual air, and reset the push plate 6 to no longer support the limit plate 3, move the push-pull rod 51 to adjust the position of the baffle 72 in the gas tank 5, so that the sleeve 52 is connected to the limit plate 3, and then inject gas to squeeze and fill the oil-rich coal sample.

[0057] Step 4: rotate the baffle 21 threadedly connected to the tank body, take out the baffle 21, and then start the RF transmitter 4 to emit high-frequency electromagnetic waves to heat the oil-rich coal sample, change the RF heating temperature, and record the pressure data, temperature change data, simulated pressure data and crack development information during the pyrolysis of the oil-rich coal through a computer to simulate the geological environment of the oil-rich coal sample, so as to facilitate the observation of the experimental data of the pyrolysis of the oil-rich coal sample by the microwave absorber under different RF heating temperature conditions during the pyrolysis of the oil-rich coal sample.

[0058] For example, because the thermal conductivity and thermal diffusion coefficient of oil-rich coal are much smaller than those of other rocks, and the specific heat capacity is much larger than that of other rocks, under the same mass and heating conditions, the heat transfer rate of coal is low, and the amount of heat required to raise the same temperature is large. During the heating process, the temperature difference inside the coal body is large, which requires that when heating oil-rich coal in situ, more efficient heating technology should be selected, more heat should be provided, and a more balanced heat transfer method should be adopted to improve the heating efficiency.

[0059] Radio frequency heating can penetrate the interior of an object, allowing the radio frequency energy to directly act on the molecules inside the object, so the heating speed is fast and uniform heating can be achieved, avoiding the problems of local overheating or uneven heating that may occur in traditional heating methods. At the same time, by adjusting the frequency and power of the radio frequency, the heating temperature and time can be accurately controlled to meet different process requirements. Therefore, the present invention adopts radio frequency heating and observes the effect of microwave absorbers on the in-situ pyrolysis of oil-rich coal.

[0060] At the same time, during the pyrolysis process of oil-rich coal, the structure inside the coal body will change, such as the breaking of bridge bonds in the coal, the generation and stabilization of free radicals, etc. These changes may lead to the appearance of pores, cracks and other structures inside the coal body, and in the closed environment of the sealed tank 1, the free release of pyrolysis products is restricted, the pressure inside the coal body is increased, the thermal expansion effect is more obvious, and the cracks are more obvious.

[0061] First, the gaps between the limiting plates 3 are filled with microwave absorbers to form sealed environmental conditions to meet experimental needs and to establish a simulation of the geological environment. As volatiles and gas products are produced during the pyrolysis of the oil-rich coal sample, the pressure sensors on the limiting plates 3 can determine the fracturing or expansion conditions of each part of the oil-rich coal, thereby providing a reference for the establishment of cracks during ultrasonic detection to obtain more accurate crack parameters.

[0062] After the volatiles and gas products enter the gas tank 5, the gas pressure pushes the push plate 6 to make the limit plate 3 or the sealing tank 1 counteract each other, reducing the gap between the adjacent limit plates 3 to reduce the microwave absorbent being affected by the gas in the pyrolysis process and flowing back, so as to ensure that the microwave absorbent enters the oil-rich coal sample. At the same time, when the push plate 6 is not extended, the adjacent limit plates 3 are not restricted, providing conditions for the microwave absorbent to enter the oil-rich coal sample, and cracks will be formed in the oil-rich coal sample. The push plate 6 affects the microwave absorbent in the injection chamber 8, so that the microwave absorbent automatically enters the cracks for observation. This reduces the steps of manual continuous addition, so as to determine the experimental parameters of the effect of microwave absorbent on the oil-rich coal sample under different conditions.

[0063] At the same time, by adding microwave absorbent to seal the interior of the limit plate 3, a gap is formed to provide space for the movement of the limit plate 3, so as to increase the internal pressure for subsequent release, thereby reducing the direct pressure of the sealed tank 1 and extending the service life of the device.

[0064] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and / or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal, characterized in that: It comprises a sealed tank and a computer, wherein a plurality of limit plates are arranged in the sealed tank, a plurality of gas storage components are arranged between the limit plates and the sealed tank, and an injection chamber for loading a microwave absorbent is arranged between adjacent gas storage components; A plurality of pressure sensors are arranged on the side of the limit plate away from the sealed tank, and the center of the limit plate is connected to the gas storage assembly. The pressure sensors are used to measure the pressure data of the oil-rich coal sample in the sealed tank on each limit plate, and send the pressure data to the computer; A radio frequency transmitter for transmitting high-frequency electromagnetic waves is fixedly connected to the center of the bottom of the sealed tank, and the radio frequency transmitter is electrically connected to the computer; The top of the sealed tank is detachably connected to a tank door, on which geological thermometers and ultrasonic detection systems are arranged alternately. The geological thermometers and ultrasonic detection systems are used to detect temperature change data and simulated pressure data of the oil-rich coal sample in the sealed tank, and send the temperature change data and simulated pressure data to a computer; the ultrasonic detection system is used to detect crack development information of the oil-rich coal sample before and after pyrolysis, and send the crack development information to a computer; The computer is used to control the working parameters of the radio frequency transmitter, and record and store the microwave absorber, pressure data, temperature change data, simulated pressure data and crack development information corresponding to each working parameter.

2. The radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to claim 1 is characterized in that: The first shaft and the second shaft are fixedly connected on both sides of the limit plate, and the first shaft and the second shaft are symmetrically arranged with the limit plate as the center. The first shaft rotates with the tank door and the sealed tank respectively; and the sealed tank and the tank door are provided with corresponding sliding grooves, and the second shaft slides with the sliding grooves.

3. The radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to claim 2, characterized in that: The sealing tank is provided with a plurality of filling ports, the positions of which correspond to the intersections of adjacent limit plates, and baffles are provided on both sides of the filling ports, one end of the baffle is rotatably matched with the sealing tank, and the other end of the baffle is fixedly connected with a hook; and a card block is slidably matched in the filling port, the card block is fixedly connected with the sealing tank bolts, and a V-shaped limit block is fixedly connected to the side of the card block close to the baffle, and the limit block is against the hook.

4. The radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to claim 3 is characterized in that: The shape of adjacent limiting plates is petal-shaped, and the adjacent limiting plates abut against each other.

5. The radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to claim 4, characterized in that: The gas storage assembly includes a gas tank connected to the limit plate, and the gas tank is fixedly connected to the center of the limit plate; a piston assembly is provided on one side of the gas tank; The piston assembly includes a sleeve connected to the gas tank, a piston is slidably fitted in the sleeve, a push plate is hingedly connected to one end of the piston away from the sleeve, the push plate is located between the limit plate and the sealing tank, a cavity is provided between the push plate and the gas tank, and pressure relief valves are evenly arranged in the sleeve, and the pressure relief valves are connected to the cavity; When the push plate moves to the farthest end, two sides of the push plate abut against the limit plates or the sealing tank respectively, and the adjacent limit plates abut against each other.

6. The radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to claim 5, characterized in that: The sealing tank is also provided with a plurality of connection holes, which correspond to the positions of the gas tanks, and the top of the gas tanks is gap-matched with the sealing tanks; and a blocking plate is slidingly matched inside the gas tank, and a push-pull rod is hinged on the side of the blocking plate away from the limit plate, and the push-pull rod is threadedly connected to the airtight rod.

7. The radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to claim 6, characterized in that: A circular partition is threadedly connected to the tank door, and the partition is arranged circumferentially with the radio frequency transmitter as the center.

8. The radio frequency heating in-situ pyrolysis simulation test device for oil-rich coal according to claim 7, characterized in that: A rubber pad seal is arranged between the gas tank, the clamping block, the push-pull rod and the sealing tank.

9. A radio frequency heating in-situ pyrolysis simulation test method for oil-rich coal, characterized in that: The test method of the radio frequency heating oil-rich coal in-situ pyrolysis simulation test device according to any one of claims 1 to 8 comprises the following steps: step 1, collecting oil-rich coal samples, and recording geological information corresponding to the oil-rich coal samples, the geological information including coal seam temperature information, coal seam pressure information, coal seam gas information and basic parameters of oil-rich coal, the basic parameters of oil-rich coal including thermal conductivity, thermal diffusion coefficient and dielectric constant; Step 2: Load the oil-rich coal sample into a sealed tank, and control the limit plate to squeeze the oil-rich coal sample based on the simulated pressure data, while keeping the temperature change data in the sealed tank consistent with the coal seam temperature information, and then keep the simulated pressure data consistent with the coal seam pressure; Step 3: Based on the basic parameters of the oil-rich coal, a microwave absorber with a high dielectric constant is selected, the gap between the limit plate and the sealing tank is filled with the microwave absorber, and based on the coal seam gas information, a gas is selected to perform air compression filling on the oil-rich coal sample; Step 4: Start the radio frequency transmitter to emit high-frequency electromagnetic waves to heat the oil-rich coal sample, and record the pressure data, temperature change data, simulated pressure data and crack development information during the pyrolysis of the oil-rich coal through a computer.

10. The radio frequency heating in-situ pyrolysis simulation test method of oil-rich coal according to claim 9, characterized in that: In step three, the microwave absorbent includes but is not limited to coke powder and iron-based catalyst.

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