Coal bed gas environment-friendly extraction system for promoting CO2 displacement through terrestrial heat

Abstract

The invention relates to the technical field of coalbed methane extraction, in particular to an environment-friendly coalbed methane extraction system for promoting CO2 displacement by utilizing terrestrial heat, which comprises a bottom plate, an extraction pipe and a heat preservation cylinder, and is characterized in that a liquid pump, a second water pump and a first water pump are mounted on the surface of the upper end of the bottom plate, one end of the liquid pump is fixedly connected with a first conveying pipe, and the other end of the liquid pump is fixedly connected with a second conveying pipe; the heating pipe is arranged to wrap the extraction pipe and circularly heat the extraction pipe, on one hand, CO2 is promoted to drive methane, the extraction rate of the methane is increased, and water resources are saved, on the other hand, CO2 geological storage is implemented, the temperature effect is reduced, and the extraction efficiency of the methane is improved. The heating pipe can be well protected and prevented from being damaged by arranging a partition plate, a spring piece and a touch plate in cooperation with an auxiliary mechanism, the direction of the multi-head pipe can be conveniently adjusted, underground water in different directions can be conveniently pumped, and the water pumping efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coalbed methane extraction, and in particular to an environmentally friendly coalbed methane extraction system that utilizes geothermal energy to promote CO2 displacement. Background Art

[0002] Coalbed methane extraction refers to the process of extracting coalbed methane from coal seams. Coalbed methane is an unconventional natural gas with methane as its main component. It is mainly adsorbed in coal seams and is a gas resource released during coal mining. Coalbed methane is a gas resource associated with coal. Its main component is methane and it is an unconventional natural gas.

[0003] In the prior art, there is a device and method for utilizing geothermal energy to extract coalbed methane, as proposed in patent application number "CN202310653880.1". The present invention not only utilizes the hot water formed after heat exchange as a heat source to heat the coalbed methane, but also uses the hot air transmitted from the fracture surface as a heat source to heat the coalbed methane, thereby improving the dissociation of the coalbed methane and the coal seam, and effectively improving the extraction efficiency and extraction volume of the coalbed methane.

[0004] However, in the above patent application, hot water after heat exchange is used as a heat source, but a continuous water source is required for heating, which wastes water resources and cannot well wrap and heat the pipeline used for extracting coalbed methane. The utilization rate of geothermal and hot water heat is not high, and the heating effect is not good. Summary of the Invention

[0005] The purpose of the present invention is to provide an environmentally friendly coalbed methane extraction system that utilizes geothermal energy to promote CO2 displacement, so as to solve the problems raised in the above-mentioned background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A coalbed methane environmentally friendly extraction system that utilizes geothermal energy to promote CO2 displacement includes a base plate, an extraction pipe and an insulation cylinder, characterized in that a liquid pump, a second water pump and a first water pump are installed on the upper surface of the base plate, one end of the liquid pump is fixedly connected to the delivery pipe one, and the other end of the liquid pump is fixedly connected to the delivery pipe two, a heating pipe is wound around the outside of the extraction pipe and located inside the insulation cylinder, and auxiliary mechanisms are provided at both ends of the insulation cylinder to prevent the two ends of the heating pipe from being twisted and damaged, a plurality of partition plates are fixedly connected to the outer wall of the extraction pipe, and one end of the water pump is fixedly connected to the connecting pipe two The other end of the water pump 1 is fixedly connected to the water pump pipe, one end of the water pump 2 is fixedly connected to the connecting pipe 2, and the end of the connecting pipe 2 away from the water pump 2 is fixedly connected to the heating pipe, the other end of the water pump 2 is fixedly connected to the connecting pipe 1, and the end of the connecting pipe 1 away from the water pump 2 is fixedly connected to the water pump pipe, and the bottom surface of the base plate is provided with an adjusting mechanism for assisting the water pump pipe to pump water, the end of the heating pipe away from the connecting pipe 2 is fixedly connected to the connecting pipe 1, the end of the connecting pipe 2 away from the water pump 1 is fixedly connected to the heating module, and the heating module is fixedly connected to one end of the connecting pipe 1.

[0008] Preferably, the auxiliary mechanism includes an annular shell, which is fixedly connected to one end of the insulation cylinder, a fixed ring is fixedly installed inside the annular shell, an annular movable plate is movably installed between the inner wall of the extraction tube and the inner wall of the annular shell, and the connecting pipe 1 is arranged to pass through the annular movable plate, and the connecting pipe 2 is arranged to pass through another annular movable plate.

[0009] Preferably, the outer wall of the annular shell is penetrated by two arc-shaped grooves, and arc-shaped slides are inserted into the two arc-shaped grooves. One end of the two arc-shaped slides is fixedly connected to the annular movable plate, and tension springs are installed between the two outer walls of the arc-shaped slides and the inner walls of the arc-shaped grooves.

[0010] Preferably, touch panels are movably installed near both sides of the interior of the partition plate, and a plurality of spring sheets are installed between the outer side walls of the two touch panels and the inner wall of the partition plate;

[0011] A plurality of arc-shaped limiting plates are movably installed inside the heat preservation tube, a plurality of telescopic connecting rods are fixedly connected between the outer walls of the plurality of arc-shaped limiting plates and the inner wall of the heat preservation tube, and a plurality of telescopic connecting rods are sleeved with buffer springs on their outer sides.

[0012] Preferably, the adjustment mechanism includes a cannula, an annular rotating plate and a knob, the cannula is rotatably connected to the bottom end of the water pumping pipe, the annular rotating plate is rotatably connected to the bottom surface of the bottom plate, the knob is rotatably connected to the upper surface of the bottom plate, the bottom end of the water pumping pipe is fixedly connected to a multi-head pipe, the bottom surface of the knob is fixedly connected to a gear through an axis, and the gear is located at the bottom surface of the bottom plate, the outer wall of the annular rotating plate is provided with a plurality of tooth grooves, and the plurality of tooth grooves are meshed with the gears.

[0013] Preferably, the upper surface of the bottom plate is fixedly connected with a sliding rod and a fixed frame, a limit block is provided on the outside of the sliding rod, and the limit block cooperates with the knob, a movable groove is provided at the top end inside the fixed frame, a limit rod is inserted inside the movable groove, a support spring is installed between the upper end of the limit rod and the top end inside the movable groove, a fixed groove is provided on the upper surface of the limit block, and the fixed groove fits with the limit rod.

[0014] Preferably, an annular groove is provided on the bottom surface of the base plate, and a plurality of sliders are slidably connected inside the annular groove, and one end of the plurality of sliders is fixedly connected to the annular rotating plate.

[0015] Beneficial effects of the present invention:

[0016] 1. The present invention provides a heating pipe wrapped around the extraction pipe, and cooperates with the multi-head pipe, water pump 1 and the pumping pipe to extract water from the aquifer, so that the water enters the heating module through the connecting pipe 2. The heating module heats the extracted water through deep underground geothermal heat, and the heated water enters the heating pipe, and continuously circulates and heats the extraction pipe, which can heat CO2 and backfill it into the gas-bearing layer after methane extraction, promoting CO2 to drive methane out, achieving the effect of fully utilizing groundwater resources, circulating heating, and saving water resources. At the same time, the heat generated by the circulating heating can increase the temperature of the gas-bearing layer itself and promote the desorption of methane. Through the above operation, the extraction pipe is circulated and heated by the heat of the geothermal heat and the connecting pipe 2, which on the one hand promotes CO2 to drive methane out, improves the methane extraction rate, and saves water resources. On the other hand, it implements CO2 geological storage, reduces the temperature effect, and completes the storage of CO2.

[0017] 2. The present invention can separate the heating tube wrapped around the extraction tube by arranging multiple partition plates and spring sheets, and leave space for thermal expansion and contraction to avoid mutual squeezing and causing extrusion rupture. When the heating tube undergoes thermal expansion, each touch plate can be squeezed and contracted in the partition plate, and the spring sheet buffers the squeezing force to further prevent squeezing rupture. Through the elastic force of the buffer spring, the inner wall of each arc-shaped limit plate is close to the outer wall of the heating tube, which can limit the position of the heating tube and avoid displacement. When the heating tube undergoes thermal expansion subsequently, each buffer spring cooperates with the telescopic connecting rod to correspondingly buffer the squeezing force, which also plays a protective role.

[0018] 3. The present invention moves the limit block along the slide bar so that one end of the limit block moves out from the inside of the knob, thereby releasing the fixation of the knob. At this time, the knob can be rotated to drive the gear to rotate, and cooperate with each tooth groove to drive the annular rotating plate to rotate, thereby driving the multi-headed pipe to rotate. The direction of the multi-headed pipe can be adjusted to facilitate the extraction of groundwater in different directions. In addition, the multi-headed pipe is provided so that the groundwater has multiple water inlets, which improves the pumping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0020] Figure 1 is a system diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention

[0022] Figure 3 It is a structural diagram of the heat preservation tube and the multi-head pipe in the present invention;

[0023] Figure 4 is a cross-sectional view of the heat preservation tube of the present invention;

[0024] Figure 5 In the present invention Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 It is a schematic structural diagram of the extraction tube and the heating tube in the present invention;

[0026] Figure 7 It is a structural schematic diagram of the annular housing in the present invention;

[0027] Figure 8 is a cross-sectional view of the bottom plate of the present invention;

[0028] Figure 9 In the present invention Figure 8 Enlarged view of point B in the middle;

[0029] Figure 10 It is a partial structural schematic diagram of the present invention.

[0030] The reference numerals in the figures are as follows:

[0031] 1. Bottom plate; 2. Insulation cylinder; 3. Liquid pump; 4. Extraction pipe; 5. Knob; 6. Heating pipe; 7. Annular shell; 8. Annular movable plate; 9. Fixed ring; 10. Arc slide; 11. Connecting pipe 1; 12. Connecting pipe 2; 13. Touch plate; 14. Partition plate; 15. Spring sheet; 16. Water pump 1; 17. Water pump 2; 18. Connecting pipe 1; 19. Connecting pipe 2; 20. Delivery pipe 1; 22. Heating module; 23. Slider; 24. Manifold; 25. Insert pipe; 26. Water extraction pipe; 27. Annular rotating plate; 28. Gear; 29. ​​Limit block; 30. Fixed frame; 31. Limit rod; 32. Slide rod; 34. Telescopic connecting rod; 35. Arc limit plate; 36. Delivery pipe 2. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] An environmentally friendly coalbed methane extraction system that uses geothermal energy to promote CO2 displacement, such as Figures 1-10 As shown, it includes a bottom plate 1, an extraction pipe 4 and an insulation cylinder 2. A liquid pump 3, a water pump 2 17 and a water pump 1 16 are installed on the upper surface of the bottom plate 1. One end of the liquid pump 3 is fixedly connected to a delivery pipe 1 20, and the other end of the liquid pump 3 is fixedly connected to a delivery pipe 2 36. A heating pipe 6 is wound around the outside of the extraction pipe 4 and located inside the insulation cylinder 2. Auxiliary mechanisms are provided at both ends of the insulation cylinder 2 to prevent the two ends of the heating pipe 6 from being twisted and damaged. A plurality of partition plates 14 are fixedly connected to the outer wall of the extraction pipe 4. One end of the water pump 16 is fixedly connected to the connecting pipe 2 12, and the other end of the water pump 16 is fixedly connected to the water extraction pipe 2 6. One end of water pump 2 17 is fixedly connected to connecting pipe 2 19, and the end of connecting pipe 2 19 away from water pump 2 17 is fixedly connected to the heating pipe 6, the other end of water pump 2 17 is fixedly connected to connecting pipe 1 18, and the end of connecting pipe 18 away from water pump 2 17 is fixedly connected to the pumping pipe 26, and the bottom surface of the base plate 1 is provided with an adjusting mechanism for assisting the pumping pipe 26 in pumping water, the end of the heating pipe 6 away from connecting pipe 2 19 is fixedly connected to connecting pipe 1 11, the end of connecting pipe 2 12 away from water pump 16 is fixedly connected to the heating module 22, and the heating module 22 is fixedly connected to one end of connecting pipe 11.

[0034] like Figure 4-Figure 7As shown, the auxiliary mechanism includes an annular shell 7, which is fixedly connected to one end of the insulation cylinder 2, and a fixed ring 9 is fixedly installed inside the annular shell 7. An annular movable plate 8 is movably installed between the inner wall of the extraction tube 4 and the inner wall of the annular shell 7, and a connecting pipe 11 is set through the annular movable plate 8, and a connecting pipe 2 19 is set through another annular movable plate 8. Two arc grooves are set through the outer wall of the annular shell 7, and an arc slide 10 is inserted into the inside of the two arc grooves, and one end of the two arc slides 10 is fixedly connected to the annular movable plate 8, and tension springs are installed between the two outer walls of the arc slide 10 and the inner wall of the arc groove.

[0035] Among them, when the connecting tube 11 is accidentally touched or pulled, causing the connecting tube 11 to be twisted, the annular movable plate 8 can be rotated accordingly between the annular shell 7 and the fixed ring 9, and the two arc-shaped slides 10 follow the annular movable plate 8 to move along the arc groove respectively, so that the tension springs located on both sides of the arc-shaped slide 10 are squeezed and stretched accordingly, and then under the action of the rebound force of the tension spring, the annular movable plate 8 can be driven to move to the initial position, thereby buffering the twisting force applied to the connecting tube 11 and avoiding twisting damage. Similarly, twisting damage to the connecting tube 2 19 can be avoided, thereby avoiding affecting the water flow in the heating tube 6 and the heating of the extraction tube 4.

[0036] The cam 13 is movably mounted on the inner side of the partition plate 14 near both sides, and a plurality of spring sheets 15 are mounted between the outer walls of the two touch sheets 13 and the inner walls of the partition plate 14. A plurality of arc-shaped limit plates 35 are movably mounted on the inner side of the heat preservation tube 2, and a plurality of telescopic links 34 are fixedly connected between the outer walls of the arc-shaped limit plates 35 and the inner walls of the heat preservation tube 2. The outer sides of the telescopic links 34 are sleeved with buffer springs. By arranging the heat preservation tube 2, the heating tube 6 can be insulated, the temperature dissipation of the heating tube 6 can be reduced, and the extraction tube 4 can be heated better. In addition, by arranging a plurality of partition plates 14 and the spring sheets 15, the heating tube 6 wound on the extraction tube 4 can be separated, and space can be left for thermal expansion and contraction to avoid mutual squeezing and causing squeezing and rupture. When the heating tube 6 expands thermally, each touch plate 13 can be squeezed and contracted in the partition plate 14, and the spring sheets 15 buffer the squeezing force to further prevent squeezing and rupture.

[0037] Through the elastic force of the buffer spring, the inner wall of each arc-shaped limit plate 35 is closely attached to the outer wall of the heating tube 6, which can limit the position of the heating tube 6 and avoid displacement. In the subsequent thermal expansion of the heating tube 6, each buffer spring cooperates with the telescopic connecting rod 34 to correspondingly buffer the extrusion force received, and also plays a protective role.

[0038] When in use, one end of the extraction pipe 4 is set in the underground gas-bearing layer, and the CO2 extracted from the atmosphere through the extraction pipe 4 is passed into the gas-bearing layer. At the same time, in this process, the multi-head pipe 24 is extended into the underground aquifer, and the water in the aquifer is extracted by the water pump 16 in cooperation with the extraction pipe 26, so that the water enters the heating module 22 through the connecting pipe 212. The heating module 22 is set in the deep underground geothermal. The heating module 22 heats the extracted water through the deep underground geothermal heat, and heats the extracted water. The heated water enters the heating pipe 6 through the connecting pipe 11, heats the extraction pipe 4, and at the same time, the water entering the inside of the connecting pipe 11 is extracted by the water pump 17 in cooperation with the connecting pipe 19, and finally the water is pumped into the extraction pipe 26 through the connecting pipe 18, so that the extracted water is discharged through the connecting pipe 11, the heating pipe 6 and the connecting pipe 11. The gas flows in the second connecting pipe 19, and the extraction pipe 4 is continuously circulated and heated to heat the CO2, and backfilled into the gas-bearing layer after the methane is extracted, so as to promote the CO2 to drive out the methane and improve the extraction rate. At the same time, it can make full use of the groundwater resources, circulate and heat, and save water resources. The heat generated by the circulatory heating can increase the temperature of the gas-bearing layer itself, and promote the desorption of methane. At the same time, by extending the free end of the transmission pipe 1 20 into the underground gas-bearing layer, and then extracting methane from the gas-bearing layer through the liquid pump 3, and pumping it out through the transmission pipe 2 36 for collection. Through the above operation, the extraction pipe 4 is heated by the heat of the geothermal combined with the connecting pipe 2 12, which on the one hand promotes the CO2 to drive out the methane and improves the extraction rate of methane. On the other hand, the CO2 geological storage is implemented to reduce the temperature effect and complete the storage of CO2.

[0039] like Figures 8-10 As shown, the adjustment mechanism includes a cannula 25, an annular rotating plate 27 and a knob 5. The cannula 25 is rotatably connected to the bottom end of the water pumping pipe 26, the annular rotating plate 27 is rotatably connected to the bottom surface of the base plate 1, and the knob 5 is rotatably connected to the upper surface of the base plate 1. The bottom end of the water pumping pipe 26 is fixedly connected to the multi-head pipe 24, and the bottom surface of the knob 5 is fixedly connected to the gear 28 through an axis rod, and the gear 28 is located at the bottom surface of the base plate 1. The outer wall of the annular rotating plate 27 is provided with a plurality of tooth grooves, and the plurality of tooth grooves are meshed with the gear 28.

[0040] When the limit block 29 is moved away from the knob 5, the inner wall of the fixing groove moves relatively along the arc surface of the limit rod 31, and the limit rod 31 can be squeezed up and moved into the movable groove. The support spring is squeezed and contracted, and the fixation of the limit block 29 can be released.

[0041] An annular groove is provided on the bottom surface of the base plate 1, and several sliders 23 are slidably connected inside the annular groove, and one end of the several sliders 23 is fixedly connected to the annular rotating plate 27. When the annular rotating plate 27 rotates, each slider 23 rotates with it and moves along the annular groove, which can limit the rotation position of the annular rotating plate 27, so that the annular rotating plate 27 can rotate stably on the bottom surface of the base plate 1.

[0042] Specifically, by moving the limit block 29 along the slide rod 32, one end of the limit block 29 is moved out from the inside of the knob 5, and the fixation of the knob 5 is released. At this time, the knob 5 can be rotated to drive the gear 28 to rotate, and cooperate with each tooth groove to drive the annular rotating plate 27 to rotate, thereby driving the multi-headed tube 24 to rotate. The direction of the multi-headed tube 24 can be adjusted to facilitate the extraction of groundwater in different directions. The multi-headed tube 24 is set so that when water is extracted, the groundwater has multiple water inlets, which improves the extraction efficiency.

[0043] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A coalbed methane environmentally friendly extraction system that utilizes geothermal energy to promote CO2 displacement, comprising a base plate (1), an extraction pipe (4) and an insulation tube (2), characterized in that: The upper surface of the bottom plate (1) is provided with a liquid pump (3), a water pump 2 (17) and a water pump 1 (16). One end of the liquid pump (3) is fixedly connected to a delivery pipe 1 (20), and the other end of the liquid pump (3) is fixedly connected to a delivery pipe 2 (36). A heating pipe (6) is wound around the outside of the extraction pipe (4) and located inside the heat preservation tube (2). Both ends of the heat preservation tube (2) are provided with auxiliary mechanisms to prevent the two ends of the heating pipe (6) from being twisted and damaged. The outer wall of the extraction pipe (4) is fixedly connected to a plurality of partition plates (14). One end of the water pump 1 (16) is fixedly connected to a connecting pipe 2 (12), and the other end of the water pump 1 (16) is fixedly connected to a water extraction pipe (26). The water pump 2 (17) One end is fixedly connected to a connecting pipe 2 (19), and the end of the connecting pipe 2 (19) away from the water pump 2 (17) is fixedly connected to the heating pipe (6), the other end of the water pump 2 (17) is fixedly connected to a connecting pipe 1 (18), and the end of the connecting pipe 1 (18) away from the water pump 2 (17) is fixedly connected to the water pumping pipe (26), the bottom surface of the bottom plate (1) is provided with a regulating mechanism for assisting the water pumping pipe (26) in pumping water, the end of the heating pipe (6) away from the connecting pipe 2 (19) is fixedly connected to the connecting pipe 1 (11), the end of the connecting pipe 2 (12) away from the water pump 1 (16) is fixedly connected to the heating module (22), and the heating module (22) is fixedly connected to one end of the connecting pipe 1 (11).

2. The environmentally friendly coalbed methane extraction system utilizing geothermal energy to promote CO2 displacement according to claim 1 is characterized in that: The auxiliary mechanism includes an annular shell (7), the annular shell (7) is fixedly connected to one end of the heat preservation tube (2), a fixed ring (9) is fixedly installed inside the annular shell (7), an annular movable plate (8) is movably installed between the inner wall of the extraction tube (4) and the inner wall of the annular shell (7), and the connecting pipe (11) is arranged to pass through the annular movable plate (8), and the connecting pipe (2) is arranged to pass through the other annular movable plate (8).

3. The environmentally friendly coalbed methane extraction system utilizing geothermal energy to promote CO2 displacement according to claim 2, characterized in that: Two arc-shaped grooves are formed through the outer wall of the annular shell (7), and arc-shaped slides (10) are inserted into the inside of the two arc-shaped grooves. One end of the two arc-shaped slides (10) is fixedly connected to the annular movable plate (8), and tension springs are installed between the two outer walls of the arc-shaped slides (10) and the inner walls of the arc-shaped grooves.

4. The environmentally friendly coalbed methane extraction system utilizing geothermal energy to promote CO2 displacement according to claim 1 is characterized in that: Touch panels (13) are movably installed near both sides of the interior of the partition plate (14), and a plurality of spring sheets (15) are installed between the outer walls of the two touch panels (13) and the inner wall of the partition plate (14); A plurality of arc-shaped limiting plates (35) are movably installed inside the heat-insulating cylinder (2); a plurality of telescopic connecting rods (34) are fixedly connected between the outer walls of the plurality of arc-shaped limiting plates (35) and the inner wall of the heat-insulating cylinder (2); and a plurality of telescopic connecting rods (34) are sleeved with buffer springs on their exteriors.

5. The environmentally friendly coalbed methane extraction system utilizing geothermal energy to promote CO2 displacement according to claim 1 is characterized in that: The regulating mechanism comprises an insert (25), an annular rotating plate (27) and a knob (5); the insert (25) is rotatably connected to the bottom end of the water pumping pipe (26); the annular rotating plate (27) is rotatably connected to the bottom surface of the bottom plate (1); the knob (5) is rotatably connected to the upper surface of the bottom plate (1); the bottom end of the water pumping pipe (26) is fixedly connected to a multi-head pipe (24); the bottom surface of the knob (5) is fixedly connected to a gear (28) via a shaft, and the gear (28) is located at the bottom surface of the bottom plate (1); the outer wall of the annular rotating plate (27) is provided with a plurality of tooth grooves, and the plurality of tooth grooves and the gear (28) are meshed with each other.

6. The environmentally friendly coalbed methane extraction system utilizing geothermal energy to promote CO2 displacement according to claim 5, characterized in that: The upper surface of the bottom plate (1) is fixedly connected with a sliding rod (32) and a fixed frame (30); a limit block (29) is sleeved on the outside of the sliding rod (32), and the limit block (29) cooperates with the knob (5); a movable groove is provided at the top end of the interior of the fixed frame (30), a limit rod (31) is inserted into the interior of the movable groove, a support spring is installed between the upper end of the limit rod (31) and the top end of the interior of the movable groove, a fixed groove is provided on the upper surface of the limit block (29), and the fixed groove is matched with the limit rod (31).

7. The environmentally friendly coalbed methane extraction system utilizing geothermal energy to promote CO2 displacement according to claim 5, characterized in that: The bottom surface of the base plate (1) is provided with an annular groove, and a plurality of sliders (23) are slidably connected inside the annular groove, and one end of the plurality of sliders (23) is fixedly connected to the annular rotating plate (27).

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