A similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths.

Abstract

This utility model discloses a similar physical experimental device for simulating underground coal gasification at complex burial depths with multiple inclination angles. Belonging to the technical field of underground coal gasification equipment, it includes a base platform, a hydraulic cylinder assembly above the platform for supporting the furnace body, a front cooling assembly at the front end of the furnace body, a top cooling assembly at the top of the furnace body, a bottom liquid cooling box and a sealed pressurization pump assembly at the bottom of the furnace body, side cooling assemblies on both sides and the back of the furnace body, an inlet connection on the left side of the furnace body, and an outlet connection on the right side of the furnace body. This utility model uses the aforementioned similar physical experimental device for simulating underground coal gasification at complex burial depths with multiple inclination angles to conduct gasification experiments on coal seams at complex burial depths with multiple inclination angles. Combined with other instruments, it obtains data such as the optimal gasifying agent, the composition ratio of the produced gas, and the shape and size of the combustion zone in the coal seam, thereby providing theoretical guidance for underground coal gasification.

Description

Technical Field

[0001] This utility model relates to the technical field of underground coal gasification equipment, and in particular to a similar physical experimental device for simulating underground coal gasification at complex burial depths with multiple inclination angles. Background Technology

[0002] In the practice of underground coal gasification production, there are three main combustion chemical reactions:

[0003] C + O₂ → CO₂ -393.5 kJ / mol

[0004] C + CO₂ → 2CO + 172.5 kJ / mol

[0005] C + H₂O → CO + H₂ + 131.28 kJ / mol

[0006] Controlling the stability of the reaction and the composition of the syngas are the main challenges in underground coal gasification technology. Because underground coal gasification is a wellless, in-situ mining process, its gasification process is "invisible." The stability of the underground coal gasification reaction and the composition of the syngas can only be controlled by controlling the concentration, pressure, and temperature of the gasifying agent. Therefore, before underground coal gasification production, it is necessary to conduct gasification pre-experiments to obtain reasonable gasifying agent concentration, pressure, and temperature for specific coal seams. However, conducting underground coal gasification experiments in actual coal seams is costly in terms of manpower, material resources, and time. Existing research methods for underground coal gasification mostly rely on the construction of numerical simulation models using computers. This method is limited by the rationality and accuracy of the numerical simulation model construction and places high demands on the theoretical level and practical ability of the personnel conducting the experiments.

[0007] Current underground coal gasification similarity physics experimental devices have the following problems: 1. Existing underground coal gasification similarity physics experimental devices generally use coal block stacking to simulate coal seams. Even if coal powder or clay is used to coat the coal blocks (as in patent CN113445975A), the discontinuous nature of the simulated coal seam will still have a certain impact on the simulation of coal seam combustion collapse. 2. Underground coal seams generally have a certain angle, some even being steeply inclined or ultra-thin. Although existing underground coal gasification similarity physics experimental devices can apply a certain angle to the furnace body, the combustion chamber inside the furnace is of a fixed size (as in patent CN104457252A), making it impossible to accurately simulate the impact of burial depth, coal seam thickness, or complex overlying strata on underground coal gasification experiments. Summary of the Invention

[0008] The purpose of this invention is to provide a similar physical experimental device for simulating underground coal gasification at complex burial depths with multiple inclination angles. This device conducts coal gasification experiments on coal seams at complex burial depths with multiple inclination angles. It utilizes a hydraulic pressure pump to provide pressure compensation when the coal seam depth is too large to simulate all strata using similar physical materials. Combined with other instruments, it obtains key data such as the optimal composition ratio of the gasifying agent mixture and the optimal gas-producing components, thereby providing theoretical guidance for underground coal gasification production in the area where the experimental coal seam is located.

[0009] To achieve the above objectives, this utility model provides a similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles. The device includes a base platform, a hydraulic cylinder assembly above the base platform for supporting the furnace body, a front cooling assembly at the front end of the furnace body, a top cooling assembly at the top of the furnace body, a bottom liquid cooling box and a sealed pressurization pump assembly at the bottom of the furnace body, side cooling assemblies on both sides and the back of the furnace body, an air inlet on the left side of the furnace body, and an air outlet on the right side of the furnace body.

[0010] Preferably, the top cooling assembly includes a top sliding cover plate, which engages with a furnace body groove on the furnace body via a sliding shaft. The top sliding cover plate is connected to the top support arm of the furnace body by a pressure knob, which directly applies pressure to the base of the top pressure knob. A support arm flange is provided at the root of the top support arm, and the support arm flange is fixed to the furnace body by flange fixing bolts. A hydraulic pressure pump is horizontally arranged on the bottom surface of the top sliding cover plate, and a hydraulic pressure pump oil pipeline is provided inside the top sliding cover plate. One end of the hydraulic pressure pump oil pipeline is connected to the main inlet of the hydraulic pressure pump above the top sliding cover plate, and the other end of the hydraulic pressure pump oil pipeline is connected to the hydraulic pressure pump. The hydraulic pressurizing pump oil pipeline is also provided with at least one hydraulic pressurizing pump inlet. The top sliding cover is provided with an O-ring seal on its side and forms a seal with the inner wall of the furnace body. The front protruding part of the top sliding cover is provided with longitudinal bolt holes for connection with the front cooling assembly. The front protruding part of the top sliding cover is also provided with an O-ring seal pressurizing oil inlet, an O-ring seal pressurizing oil outlet, and a top cover transverse bolt hole for fixing with the sliding claw hook. A top liquid cooling box is provided above the top sliding cover. The upper surface of the top liquid cooling box is provided with a plane level, a top circulating coolant inlet, and a top hydraulic pressurizing fluid reserved port. The side of the top liquid cooling box is provided with a top circulating coolant outlet.

[0011] Preferably, the side cooling assembly includes a side liquid cooling box, which is divided into liquid cooling boxes disposed on both sides and the back of the furnace body. The side liquid cooling box and the bottom liquid cooling box are connected by a liquid cooling box connecting pipe. The side liquid cooling box and the bottom liquid cooling box constitute a cooling system. The side liquid cooling box is provided with a side circulating coolant inlet, and the bottom liquid cooling box is provided with a circulating coolant outlet. A side level is provided at a parallel position to the air inlet.

[0012] Preferably, the front-end cooling assembly includes a front-end sliding cover plate, which engages with a furnace body slide groove at the front end of the furnace body. A front liquid cooling box is provided on the surface of the front-end sliding cover plate, which is provided with a front circulating coolant inlet, a front level, and a front circulating coolant outlet. The front-end sliding cover plate is machined with transverse bolt holes for fixing with sliding claw hooks, and the sliding claw hooks engage with claw hook slide grooves provided on the back of the furnace body slide groove.

[0013] Preferably, the sealing pressurizing pump assembly includes a sealing pressurizing pump oil pipeline. One end of the sealing pressurizing pump oil pipeline is connected to a sealing system pressurizing liquid inlet located on the back of the furnace body. The other end of the sealing pressurizing pump oil pipeline is connected to a sealing pressurizing pump inlet. The sealing pressurizing pump inlet is connected to a sealing pressurizing pump. The sealing pressurizing pump is connected to a sealing pressurizing slider. A sealing pressurizing slider slot is provided at the front end of the sealing pressurizing slider, and a sealing pressurizing pump force port is provided at the rear end of the sealing pressurizing slider.

[0014] Preferably, the side liquid cooling box has an air inlet reserved port corresponding to the air inlet port and an air outlet reserved port corresponding to the air outlet port. The bottom of the side liquid cooling box also has a coolant outlet, and the bottom of the liquid cooling box on the back of the furnace body also has a sealing system pressurization fluid reserved port.

[0015] Preferably, the hydraulic cylinder assembly includes a supporting hydraulic cylinder, which contains a supporting hydraulic rod. The supporting hydraulic rod is connected to the furnace body and the base platform via a universal joint connector, and a universal joint connecting bearing is provided at the universal joint connector. A base platform support foot is provided below the base platform.

[0016] Therefore, this utility model employs the aforementioned simulated coal underground gasification similar physical experimental device for complex burial depths with multiple inclination angles. It can simulate the actual angle of coal seam occurrence. Furthermore, due to the presence of the top sliding cover and the front sliding cover, the size of the combustion chamber of the furnace can be adjusted. Considering the influence of factors such as the discontinuity of coal seam texture on the gasification process and the collapse of the combustion zone by using coal block stacking, the adjustable combustion chamber structure design allows large blocks of coal to be cut into cuboids and placed directly inside the experimental furnace. Other similar physical materials are then filled to simulate the coal seam roof, overlying rock strata, and other formations, making the coal underground gasification experiment closer to the real coal underground gasification production process. Moreover, the hydraulic pressure pump can provide pressure compensation when the coal seam burial depth is large and it is impossible to simulate all formations with similar physical materials. This invention, in conjunction with other instruments, can accurately capture or record various key gasification data from similar physical experiments of underground coal gasification, such as gasifying agent temperature, gasifying agent pressure, gasifying agent flow rate, gasifying agent concentration, gas production components, gas production concentration, and the shape and size of the coal seam combustion zone. By analyzing the experimental data, it can determine the optimal composition ratio of the gasifying agent mixture and the optimal gas production components when the combustion zone collapses and causes a shutdown. This provides theoretical guidance for underground coal gasification production in the area where the experimental coal seam is located.

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall front structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths according to this utility model.

[0019] Figure 2 This is a schematic diagram of the overall back structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths according to this utility model.

[0020] Figure 3 This is a schematic diagram of the top sliding cover structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles.

[0021] Figure 4 This is a schematic diagram of the oil pipeline structure of the hydraulic pressurizing pump inside the top sliding cover of an embodiment of the similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths.

[0022] Figure 5 This is a schematic diagram of the top liquid-cooled box structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at complex burial depths with multiple inclination angles.

[0023] Figure 6This is a schematic diagram of the side liquid-cooled box and bottom liquid-cooled box structure of an embodiment of a similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths according to this utility model.

[0024] Figure 7 This is a schematic diagram of the side liquid-cooled box and bottom liquid-cooled box structure of an embodiment of a similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths according to this utility model.

[0025] Figure 8 This is a front three-dimensional structural diagram of the combustion chamber of the furnace body in an embodiment of the similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths according to this utility model.

[0026] Figure 9 This is a schematic diagram of the front structure of the combustion chamber of the furnace body in an embodiment of the similar physical experimental device for simulating underground coal gasification at complex burial depths with multiple inclination angles.

[0027] Figure 10 This is a schematic diagram of the oil pipeline structure of the sealed pressurization pump at the bottom of the furnace body in an embodiment of the similar physical experimental device for simulating underground coal gasification at multiple inclination angles and complex burial depths according to this utility model.

[0028] Figure 11 This is a schematic diagram of the sliding claw hook structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles.

[0029] Figure 12 This is a schematic diagram of the bottom sealing and pressurizing slider structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles.

[0030] Figure 13 This is a schematic diagram of the hydraulic cylinder assembly structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles.

[0031] Figure 14 This is a schematic diagram of the base platform structure of an embodiment of the similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles.

[0032] Figure Labels

[0033] 1. Base platform; 2. Supporting hydraulic cylinder; 3. Universal joint connector; 4. Sliding claw hook; 5. Air inlet connection port; 6. Side level; 7. Side circulating coolant inlet; 8. Side liquid cooling tank; 9. Top support arm; 10. Top liquid cooling tank; 11. Pressurization knob; 12. Support arm fixing bolt; 13. Plane level; 14. Top circulating coolant inlet; 15. Top hydraulic pressurization fluid reserved port; 16. Top circulating coolant outlet; 17. O-ring seal pressurization oil inlet; 18. Top sliding cover plate; 19. O-ring seal pressurization oil outlet; 20. Front sliding cover plate; 21. Front liquid cooling tank; 22. Front circulating coolant inlet; 23. Front level; 24. Front circulating coolant outlet; 25. Bottom liquid cooling tank; 26. Universal joint connecting bearing; 27. Base platform support foot; 28. Liquid cooling tank connecting pipe; 29. ​​Claw hook slide groove; 30. Front cover plate transverse bolt holes; 31. Air outlet; 32. Support arm flange; 33. Top pressurization knob base; 34. Flange fixing bolts; 35. Sealing system pressurization fluid reserved port; 36. O-ring seal; 37. Top cover plate transverse bolt holes; 38. Longitudinal bolt holes; 39. Hydraulic pressurization pump; 40. Sliding shaft; 41. Hydraulic pressurization pump oil pipeline; 42. Hydraulic pressurization pump inlet; 43. Hydraulic pressurization pump 44. Main liquid inlet; 45. Reserved air outlet connection port; 46. Coolant outlet; 47. Circulating coolant outlet; 48. Reserved air inlet connection port; 49. Furnace body slide groove; 50. Sealed pressurizing slider; 51. Sealed pressurizing pump; 52. Sealed pressurizing pump inlet; 53. Sealed pressurizing system pressurizing fluid inlet; 54. Sealed pressurizing pump oil pipeline; 55. Sealed pressurizing slider slot; 56. Sealed pressurizing pump force inlet; 57. Support hydraulic rod. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0035] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Example 1

[0037] This invention provides a similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles. The overall structure is as follows: Figure 1 , 2 As shown, the furnace includes a base platform 1, a hydraulic cylinder assembly on top of the base platform 1 for supporting the furnace body, a front cooling assembly at the front end of the furnace body, a top cooling assembly at the top of the furnace body, a bottom liquid cooling box 25 and a sealed pressurizing pump assembly at the bottom of the furnace body, side cooling assemblies on both sides and the back of the furnace body, an air inlet 5 on the left side of the furnace body, and an air outlet 31 on the right side of the furnace body.

[0038] The top cooling assembly includes a top sliding cover 18, such as Figure 3-5 As shown, the top sliding cover 18 engages with the furnace body slide groove 48 provided on the furnace body via the sliding shaft 40. The top sliding cover 18 is connected to the top support arm 9 of the furnace body by a pressure knob 11. The pressure knob 11 applies pressure directly to the top pressure knob base 33. By rotating the pressure knob 11, a vertical downward force can be applied to the top sliding cover 18, ensuring that the top sliding cover 18 will not collapse due to excessive pressure during the gasification experiment. A support arm fixing bolt 12 is provided in the middle of the top support arm 9, and a support arm flange 32 is provided at the root of the top support arm 9. The support arm flange 32 is fixed to the furnace body by flange fixing bolts 34.

[0039] A hydraulic pressurizing pump 39 is horizontally arranged on the bottom surface of the top sliding cover 18. A hydraulic pressurizing pump oil pipeline 41 is installed inside the top sliding cover 18. One end of the hydraulic pressurizing pump oil pipeline 41 is connected to the main hydraulic pressurizing pump inlet 43 above the top sliding cover 18, and the other end is connected to the hydraulic pressurizing pump 39. The hydraulic pressurizing pump oil pipeline 41 also has at least one hydraulic pressurizing pump inlet 42. An O-ring seal 36 is provided on the side of the top sliding cover 18 and forms a seal with the inner wall of the furnace body. The protruding part at the front end of the top sliding cover 18 is provided with… The longitudinal bolt hole 38 is used to connect with the front sliding cover plate 20 in the front cooling assembly. The front protruding part of the top sliding cover plate 18 is also provided with an O-ring seal bladder pressurized oil inlet 17, an O-ring seal bladder pressurized oil outlet 19, and a top cover plate transverse bolt hole 37 for fixing with the sliding claw hook 4. A top liquid cooling box 10 is provided above the top sliding cover plate 18. A plane level 13, a top circulating coolant inlet 14, and a top hydraulic pressurized fluid reserved port 15 are provided on the upper surface of the top liquid cooling box 10. A top circulating coolant outlet 16 is provided on the side of the top liquid cooling box 10.

[0040] like Figure 6 , 7As shown, the side cooling assembly includes a side liquid cooling box 8, which is located on both sides and the back of the furnace body. The side liquid cooling box 8 and the bottom liquid cooling box 25 are connected by a liquid cooling box connecting pipe 28 to form a cooling system. The side liquid cooling box 8 is provided with a side circulating coolant inlet 7, and the bottom liquid cooling box 25 is provided with a circulating coolant outlet 46. A side level 6 is provided at a parallel position to the air inlet 5.

[0041] like Figure 8 , 9 As shown, the front-end cooling assembly includes a front sliding cover plate 20, which engages with a furnace body slide groove 48 at the front end of the furnace body. A front liquid cooling box 21 is provided on the surface of the front sliding cover plate 20, with a front circulating coolant inlet 22, a front level 23, and a front circulating coolant outlet 24. The front sliding cover plate 20 has transverse bolt holes 30 at both ends for fixing to sliding claw hooks 4. The sliding claw hooks 4 are fixed to the transverse bolt holes 30 by bolts. The sliding claw hooks 4 engage with claw hook slide grooves 29 on the back of the furnace body slide groove 48, allowing them to slide freely up and down within the claw hook slide grooves 29. The top liquid cooling box 10 and its auxiliary components, and the front liquid cooling box 21 and its auxiliary components each constitute a cooling system. The side liquid cooling box 8 and the bottom liquid cooling box 25 constitute another cooling system. The furnace body as a whole has three cooling systems.

[0042] like Figure 10-12 As shown, the sealing pressurization pump assembly includes a sealing pressurization pump oil pipeline 53. One end of the sealing pressurization pump oil pipeline 53 is connected to a sealing system pressurization liquid inlet 52 located on the back of the furnace body. The other end of the sealing pressurization pump oil pipeline 53 is connected to a sealing pressurization pump inlet 51. The sealing pressurization pump inlet 51 is connected to a sealing pressurization pump 50. The sealing pressurization pump 50 is connected to a sealing pressurization slider 49. The front end of the sealing pressurization slider 49 is provided with a sealing pressurization slider slot 54 for pressing and engaging with the sliding shaft 40. The rear end of the sealing pressurization slider 49 is provided with a sealing pressurization pump force port 55.

[0043] The side liquid cooling box 8 has an air inlet reserved port 47 corresponding to the air inlet port 5 and an air outlet reserved port 44 corresponding to the air outlet port 31. The bottom of the side liquid cooling box 8 also has a coolant outlet 45. The bottom of the liquid cooling box on the back of the furnace body also has a sealing system pressurization fluid reserved port 35.

[0044] like Figure 13 , 14 As shown, the hydraulic cylinder assembly includes a supporting hydraulic cylinder 2, which contains a supporting hydraulic rod 56. The supporting hydraulic rod 56 is connected to the furnace body and the base platform 1 via a universal joint connector 3. A universal joint connecting bearing 26 is provided at the universal joint connector 3. A base platform support foot 27 is provided below the base platform 1.

[0045] The steps for using the simulated underground coal gasification similarity physical experimental device at complex burial depths and multiple inclination angles described in this utility model include:

[0046] S1. The original design of this utility model is to cut large coal pieces into single coal pieces and then simulate coal seams using similar physical materials. The bottom dimensions of the furnace combustion chamber are designed to be 400mm×500mm. Due to the presence of the front sliding cover plate 20 and the top sliding cover plate 18, the height of the furnace combustion chamber can be adjusted from 400mm to 800mm. Large coal pieces sampled on-site are cut into coal seam shapes of 400mm×500mm×10mm. Data on the rock mechanical properties of the roof, floor, and strata in the coal seam storage environment are extracted. Based on the mechanical property data, materials such as sand, calcium carbonate, gypsum, and water are mixed in a certain proportion using the physical principle of material similarity to prepare the roof, floor, and strata. Their planar dimensions are all 400mm×500mm, while the height is determined according to the actual longitudinal thickness ratio of each stratum.

[0047] S2. Slide the top sliding cover plate 18. Determine the longitudinal height of the furnace combustion chamber according to the actual coal seam burial depth. Slide the front sliding cover plate 20 to match this height. At this time, slide the sliding claw hooks 4 into the claw hook grooves 29 (the number of sliding claw hooks 4 should be no less than 5 on each side) and connect them with the transverse bolt holes 30 of the front cover plate. Use bolts to fix them to form a seal. Arrange the bottom plate, coal seam, top plate and various strata prepared using similar physical materials in the combustion chamber from bottom to top. Connect the coal seam to the air inlet 5 and the air outlet 5. 31 is flush with the coal seam. A gasification channel is drilled through the gas inlet 5 through the gas inlet 5 to the coal seam inside the gas outlet 31. At this time, the top sliding cover plate 18 is placed on the furnace body and is flush with the front sliding cover plate 20. Two sliding claw hooks 4 are used on each side of the top sliding cover plate 18. The horizontal bolt holes 37 of the top cover plate and the sliding claw hooks 4 are fixed with bolts to form a seal. The longitudinal bolt holes 38 in the middle of the protruding part at the front of the top sliding cover plate 18 are fixed with the front sliding cover plate 20 to form a seal.

[0048] S3. Pressurized oil is introduced into the pressurized oil inlet 17 of the O-ring seal bladder, while the pressurized oil outlet 19 of the O-ring seal bladder is temporarily closed. At this time, the O-ring seal bladder 36 expands due to pressure, causing the top sliding cover 18 to form a seal with the inner wall of the furnace. Pressurized oil is introduced into the pressurized fluid inlet 52 of the sealing system at the bottom, and the sealing pressurization pump 50 pushes the sealing pressurization slider 49 forward to form a seal with the front sliding cover 20.

[0049] S4. Screw the three pressure knobs 11 into the top support arm 9 and into contact with the top sliding cover 18 so that the top sliding cover 18 will not collapse due to excessive pressure during the gasification experiment.

[0050] S5. If the simulated coal seam depth is small, it is sufficient to ensure that the bottom plane of the hydraulic pressurizing pump 39 on the bottom surface of the top sliding cover plate 18 is in contact with the uppermost stratum. The hydraulic pressurizing pump 39 does not need to apply pressure to it. If the simulated coal seam depth is large and it is impossible to make similar physical materials for all strata, pressurizing oil is introduced into the main inlet 43 of the hydraulic pressurizing pump to give pressure to the hydraulic pressurizing pump 39 to pressurize the uppermost stratum, thereby replacing the pressure of the coal seam on the part of the strata that cannot be simulated.

[0051] S6. When the extension and retraction lengths of the four supporting hydraulic rods 56 are not the same, the experimental furnace body will tilt at an angle. Based on the actual coal seam tilt angle data collected, the extension and retraction lengths of the four supporting hydraulic rods 56 are adjusted, and the pointer information of the three levels is constantly observed. After repeating this process multiple times, the tilt angle of the furnace body is made consistent with the actual coal seam tilt angle.

[0052] S7. Use a heating (cooling) device to preheat (precool) the coolant to the same temperature as the coal seam environment, and then inject it into all the liquid cooling boxes through the coolant inlet. Connect the outlet of all the liquid cooling boxes to the heating (cooling) device and repeat the cycle to ensure that the external temperature of the experimental furnace remains constant.

[0053] S8. The pre-mixed gasifying agent (oxygen, high-temperature steam, and inert gas) is pressurized into the furnace body through the gas supply pipeline. The gas supply pipeline is sealed to the gas inlet 5 of the furnace body. After the gasifying agent is introduced for 20 minutes, it is ignited in the coal seam gasification channel near the gas inlet 5. The pressure, temperature, and flow rate of the introduced gasifying agent can be monitored with the help of other instruments (pressure gauge, thermometer, flow meter). A temperature sensor is installed at the gas inlet 5 to monitor the temperature of the coal seam combustion zone in the furnace in real time during the coal gasification process. A gas composition sensor is installed at the gas inlet 5 to monitor the composition and concentration of the introduced gasifying agent in real time during the coal gasification process. At the same time, the gas outlet can be connected to a gas chromatograph to monitor the gas composition in real time. A handheld X-ray imaging detector can be used to monitor the collapse of the coal seam combustion zone inside the furnace body in real time.

[0054] Therefore, this utility model employs the aforementioned simulated coal underground gasification similar physical experimental device for complex burial depths with multiple inclination angles. It can simulate the actual angle of coal seam occurrence. Due to the presence of the top and front sliding cover plates, the combustion chamber of the furnace can be adjusted in size. Furthermore, the hydraulic pressure pump can provide pressure compensation when the coal seam burial depth is large and it is impossible to simulate all strata using similar physical materials. In conjunction with other instruments, this utility model can accurately capture or record various key gasification data from coal underground gasification similar physical experiments, such as gasifying agent temperature, gasifying agent pressure, gasifying agent flow rate, gasifying agent concentration, gas production components, gas production concentration, and the shape and size of the coal seam combustion zone. By analyzing the experimental data, it can determine the optimal composition ratio of the gasifying agent mixture and the optimal gas production components when the combustion zone does not collapse and cause furnace shutdown. This provides theoretical guidance for coal underground gasification production in the area where the experimental coal seam is located.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A similar physical experimental device for simulating underground coal gasification at complex burial depths and multiple inclination angles, characterized in that: The furnace includes a base platform, a hydraulic cylinder assembly above the base platform for supporting the furnace body, a front cooling assembly at the front end of the furnace body, a top cooling assembly at the top end of the furnace body, a bottom liquid cooling box and a sealed pressurizing pump assembly at the bottom of the furnace body, side cooling assemblies on both sides and the back of the furnace body, an air inlet on the left side of the furnace body, and an air outlet on the right side of the furnace body. The top cooling assembly includes a top sliding cover plate, which engages with a furnace body groove on the furnace body via a sliding shaft. The top sliding cover plate is connected to the top support arm of the furnace body by a pressure knob, which directly applies pressure to the top pressure knob base. A support arm flange is located at the base of the top support arm, and the flange is fixed to the furnace body by flange fixing bolts. A hydraulic pressure pump is horizontally arranged on the bottom surface of the top sliding cover plate. A hydraulic pressure pump oil pipeline is installed inside the top sliding cover plate. One end of the hydraulic pressure pump oil pipeline is connected to the main inlet of the hydraulic pressure pump above the top sliding cover plate, and the other end is connected to the hydraulic pressure pump. The hydraulic pressurizing pump oil pipeline is also provided with at least one hydraulic pressurizing pump inlet. The top sliding cover is provided with an O-ring seal on its side and forms a seal with the inner wall of the furnace body. The front protruding part of the top sliding cover is provided with longitudinal bolt holes for connection with the front cooling assembly. The front protruding part of the top sliding cover is also provided with an O-ring seal pressurizing oil inlet, an O-ring seal pressurizing oil outlet, and a top cover transverse bolt hole for fixing with the sliding claw hook. A top liquid cooling box is provided above the top sliding cover. The upper surface of the top liquid cooling box is provided with a plane level, a top circulating coolant inlet, and a top hydraulic pressurizing fluid reserved port. The side of the top liquid cooling box is provided with a top circulating coolant outlet. The sealed pressurizing pump assembly includes a sealed pressurizing pump oil pipeline. One end of the sealed pressurizing pump oil pipeline is connected to a pressurizing fluid inlet of the sealing system located on the back of the furnace body. The other end of the sealed pressurizing pump oil pipeline is connected to a sealed pressurizing pump inlet. The sealed pressurizing pump inlet is connected to a sealed pressurizing pump. The sealed pressurizing pump is connected to a sealed pressurizing slider. A sealed pressurizing slider slot is provided at the front end of the sealed pressurizing slider. A sealed pressurizing pump force port is provided at the rear end of the sealed pressurizing slider.

2. The coal CBM physical simulation device according to claim 1, wherein: The side cooling assembly includes a side liquid cooling box, which is divided into liquid cooling boxes located on both sides and the back of the furnace body. The side liquid cooling box and the bottom liquid cooling box are connected by a liquid cooling box connecting pipe. The side liquid cooling box and the bottom liquid cooling box constitute a cooling system. The side liquid cooling box is provided with a side circulating coolant inlet, and the bottom liquid cooling box is provided with a circulating coolant outlet. A side level is provided at a parallel position to the air inlet.

3. The coal CBM physical simulation device of claim 1, wherein: The front-end cooling assembly includes a front-end sliding cover plate, which engages with a furnace body slide groove at the front end of the furnace body. A front liquid cooling box is provided on the surface of the front-end sliding cover plate, which is provided with a front circulating coolant inlet, a front level, and a front circulating coolant outlet. The front-end sliding cover plate is machined with transverse bolt holes for fixing with sliding claw hooks. The sliding claw hooks engage with a claw hook slide groove provided on the back of the furnace body slide groove.

4. The coal CBM physical simulation device of claim 2, wherein: The side liquid cooling box has an air inlet reserved port corresponding to the air inlet port and an air outlet reserved port corresponding to the air outlet port. The bottom of the side liquid cooling box also has a coolant outlet. The bottom of the liquid cooling box on the back of the furnace body also has a sealing system pressurization fluid reserved port.

5. The coal CBM physical simulation experiment device of simulating multi-dip complex buried depth according to claim 1, characterized in that: The hydraulic cylinder assembly includes a supporting hydraulic cylinder, which contains a supporting hydraulic rod. The supporting hydraulic rod is connected to the furnace body and the base platform via a universal joint connector. A universal joint connecting bearing is provided at the universal joint connector. A base platform support foot is provided below the base platform.

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