Coal bed gas extraction and underground coal gasification integrated technology based on double-gas co-extraction

Abstract

The invention discloses a coal bed gas extraction and underground coal gasification integrated technology based on double-gas co-extraction, which comprises a gas inlet channel, a gas injection pipe, a gas outlet channel, a gas outlet pipe, a lower gas extraction assembly, an upper gas extraction assembly and an upper gas extraction assembly movement control assembly, the upper gas production assembly is movably connected with the gas outlet pipe, the bottom end of a vertical pipe of the upper gas production assembly movement control assembly is connected with the lower gas production assembly, when the lower gas production assembly moves to a lower coal seam, a movable magnetic block in the vertical pipe is pushed to move upwards through the pressure of the lower coal seam, and the movable magnetic block and the upper gas production assembly are attracted; when the upper gas production assembly moves to the position of the upper coal seam, the coal seam gas pressure of the upper coal seam acts on the automatic valve assembly, the automatic valve assembly is closed, the automatic valve assembly is kept in a closed state, a closed space is formed at the top of the movable magnetic block, and the movable magnetic block cannot move; and then the upper gas production assembly is positioned.

Description

Technical Field

[0001] The present invention relates to the field related to coalbed methane well development, and specifically to an integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-production. Background Art

[0002] Underground coal gasification technology is a technology that converts underground coal into combustible gas in situ through thermochemical reactions. In the specific implementation process, multiple channels are usually established and used as air inlet channels and air outlet channels respectively. The air inlet channels and air outlet channels are then connected through the gasification channel, the coal seam is ignited and the gasification agent is transported to the air inlet channel. The generated combustible gas (raw coal gas) is discharged to the ground through the air outlet channel;

[0003] The existing coalbed methane extraction and underground coal gasification integration technology is used to extract coalbed methane from different coal seams through co-extraction technology. At present, the publication number CN215761627U discloses a "coalbed methane double-layer co-extraction device", which includes a first gas filling pipe, a gas production pipe, a first gas production assembly, a second gas production assembly and a coalbed methane mixing assembly. An extraction well is drilled in the coalbed methane mining area, and an outer casing well pipe is installed in the extraction well. Ventilation holes are evenly opened on the pipe wall of the outer casing well pipe at the corresponding coal seam position. The first gas filling pipe is vertically arranged in the extraction well with the same center, and the gas production pipe is arranged in the first gas filling pipe with the same center. The first gas production assembly and the second gas production assembly are symmetrically arranged on the first gas filling pipe from top to bottom. The first gas production assembly is provided with a first sealer on the upper side and the lower side, and the second gas production assembly is provided with a second sealer on the upper side and the lower side. The coalbed methane mixing assembly is arranged between the first sealer on the lower side and the second sealer on the upper side.

[0004] Although the above-mentioned coalbed methane double-layer co-mining device can realize the simultaneous mining of coalbed methane in the upper and lower coal seams and avoid backflow during coalbed methane co-mining, the distance between the first gas production component and the second gas production component is not convenient to adjust according to the distance between the upper and lower coal seams, and it is not convenient to position the two gas production components separately according to the position of the coal seam. Summary of the invention

[0005] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides an integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-production.

[0006] The present invention is achieved in this way: it constructs an integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-extraction, the device comprises an air inlet channel, an air injection pipe, an air outlet channel, an air outlet pipe, a lower air extraction component, an upper air extraction component and an upper air extraction component movement control component, the air inlet channel and the air outlet channel extend into the upper coal seam and the lower coal seam, the air inlet channel is vertically provided with an air injection pipe inside, the air injection pipe injects gasification agent into the upper coal seam and the lower coal seam through the air inlet channel, the air outlet pipe is provided at the inner middle part of the air outlet channel, the upper and lower sides of the outer side of the air outlet pipe are respectively provided with an upper and lower air extraction component, and the lower air extraction component is fixedly connected to the air outlet pipe, and the upper air extraction component is slidably connected to the air outlet pipe, the upper air extraction component movement control component is used to control the position of the upper air extraction component, the upper air extraction component movement control component comprises an outer frame, an air inlet pipe, a conduit one, an automatic valve component, a piston cylinder, a piston plate, a conduit two, a valve limiting component, an exhaust Tube, air flow sensor, vertical pipe and movable magnetic block, an intake pipe is arranged in the middle of the right end of the inner part of the outer frame, the right end of the intake pipe is connected with conduit one, the left end of the intake pipe is connected with the automatic valve assembly, the bottom right side of the automatic valve assembly is connected with the piston plate, and the piston plate is embedded in the piston cylinder, the right end of the piston cylinder is connected with conduit two, and the outer wall of the piston cylinder is fixedly connected with the outer frame, a valve limiting assembly is installed on the top of the outer frame, the valve limiting assembly is used to limit the opening of the automatic valve assembly, the left end of the automatic valve assembly is connected with the exhaust pipe, an air flow sensor is installed in the middle of the exhaust pipe, the right end of conduit one is connected with the vertical pipe, the vertical pipe vertically penetrates the upper gas collection assembly, and the bottom end of the vertical pipe extends into the lower gas collection assembly, an movable magnetic block is arranged inside the vertical pipe, and the movable magnetic block and the upper gas collection assembly are adsorbed on each other, and the conduit two is connected to the upper gas collection assembly.

[0007] Preferably, the upper gas collection component and the lower gas collection component have the same structure, the upper gas collection component includes a movable frame, a gas collection hole and a sealing plate, the left side of the movable frame is provided with a gas collection hole, and the upper and lower sides of the movable frame are respectively fixed with sealing plates, the movable frame, the gas collection hole and the sealing plate of the upper gas collection component are vertically penetrated by the gas outlet pipe and the vertical pipe, and the upper gas collection component is slidably connected to the gas outlet pipe and the vertical pipe, the sealing plate of the upper gas collection component and the magnetic block are mutually adsorbed, the movable frame of the upper gas collection component is connected to the conduit, the movable frame, the gas collection hole and the inner wall of the sealing plate of the lower gas collection component are fixedly connected to the gas outlet pipe and the vertical pipe, and the bottom end of the vertical pipe is connected to the movable frame of the lower gas collection component.

[0008] Preferably, the automatic valve assembly includes a valve body, a valve stem, a valve plate, a rotating rod, a connecting rod, a slide groove, a movable shaft, a piston rod and a moving rod. A valve plate is arranged inside the valve body, the front end of the valve plate is drivingly connected to the valve stem, the front end of the valve stem is drivingly connected to the rotating rod and the connecting rod, a slide groove is provided at the inner bottom of the connecting rod, a movable shaft is arranged inside the slide groove, the movable shaft slides along the inner wall of the slide groove, and the movable shaft is connected to the left end of the piston rod and the bottom end of the moving rod, the right end of the piston rod extends into the piston cylinder and is connected to the piston plate, and the left and right sides of the valve body are respectively connected to the exhaust pipe and the intake pipe.

[0009] Preferably, the valve limiting assembly includes a protective frame, a cover plate, a rotating rod limiting mechanism, a propping plate, a connecting rod 1, a pull rod 1, a cross bar, a connecting rod 2, a pull rod 2 and a pull block. The top of the protective frame is covered by the cover plate, a rotating rod limiting mechanism is provided on the left side of the bottom end of the protective frame, and the rotating rod limiting mechanism is installed on the top of the outer frame, a propping plate is provided on the right side of the rotating rod limiting mechanism, the top of the propping plate is connected to the connecting rod 1, and the top of the connecting rod 1 is connected to the pull rod 1, a pull block is provided at the left end of the rear side of the cross bar, and the pull block is provided on the left side of the connecting rod 1, the right end of the cross bar is connected to the connecting rod 2, the top of the connecting rod 2 is connected to the pull rod, and the bottom end of the connecting rod 2 is connected to the moving rod, and the protective frame is installed on the top of the outer frame.

[0010] Preferably, the rotating rod limiting mechanism includes a limiting block, a top plate, a support plate, a light rod, a support plate and a spring, the top of the limiting block is fixedly connected to the top plate, the middle part of the outer side of the limiting block is fixedly connected to the support plate, the limiting block vertically penetrates the top of the outer frame, and the top plate is arranged on the top of the outer frame, the support plate is arranged inside the outer frame, the middle part of the support plate is vertically penetrated by the light rod, the bottom end of the light rod is fixedly connected to the support plate, the top of the support plate is elastically connected to the inner top of the outer frame through a spring, and the spring is sleeved on the outer side of the light rod.

[0011] Preferably, the outer wall of the air outlet channel is provided with air holes, and the air holes correspond to the positions of the upper coal seam and the lower coal seam, and the outer wall of the air outlet pipe is provided with air inlet holes.

[0012] Preferably, the right side of the top of the rotating rod is arranged in an inclined surface.

[0013] Preferably, the bottom end surface of the support plate is in contact with the top of the outer frame, and the left side of the top end of the support plate is inclined and tilted upward from left to right.

[0014] The present invention has the following advantages: The present invention provides an integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-production through improvement, and compared with the same type of equipment, it has the following improvements:

[0015] The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-extraction described in the present invention fixes the lower gas extraction component to the bottom of the gas outlet pipe, and the upper gas extraction component and the gas outlet pipe are set to be movably connected, and the upper gas extraction component movement control component is set, and the bottom end of the vertical pipe of the upper gas extraction component movement control component is connected to the lower gas extraction component. When the lower gas extraction component moves to the lower coal seam, the pressure of the lower coal seam pushes the movable magnetic block inside the vertical pipe to move upward, and the movable magnetic block is adsorbed with the upper gas extraction component, so that the upper gas extraction component moves upward with the movable magnetic block. When the movable magnetic block moves upward, the air on the top of the movable magnetic block is squeezed out, and the air is discharged through the air flow sensor When air discharge is detected, it is determined that the lower gas production component is connected with the lower coal seam, which has the effect of detecting the connection between the lower coal seam and the lower gas production component. When the upper gas production component moves to the upper coal seam position, the coal seam methane pressure of the upper coal seam acts on the automatic valve assembly to close the automatic valve assembly. When the automatic valve assembly is closed, it is limited by the rotating rod limit mechanism to keep the automatic valve assembly in a closed state. A closed space is formed on the top of the movable magnetic block, which prevents the movable magnetic block from moving, thereby completing the positioning of the upper gas production component. A mechanical structure is used to automatically position the upper gas production component according to the upper coal seam position, thereby increasing the automation effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of the upper gas collection assembly of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the upper gas extraction assembly movement control assembly of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of the automatic valve assembly of the present invention;

[0020] Figure 5 It is a top view of the internal structure of the valve body of the present invention;

[0021] Figure 6 It is a schematic diagram of the internal structure of the valve limiting assembly of the present invention;

[0022] Figure 7 It is a top view of the pull block structure of the present invention;

[0023] Figure 8 The present invention Figure 6 A partial enlarged view of area A.

[0024] Among them: air inlet channel-1, air injection pipe-2, air outlet channel-3, air outlet pipe-4, lower air collection component-5, upper air collection component-6, upper air collection component movement control component-7, movable frame-61, air collection hole-62, sealing plate-63, outer frame-71, air inlet pipe-72, catheter 1-73, automatic valve component-74, piston cylinder-75, piston plate-76, catheter 2-77, valve limit component-78, exhaust pipe-79, air flow sensor-710, vertical pipe-711, movable magnetic block-712, valve body-741, valve stem-74 2. Valve plate 743, rotating rod 744, connecting rod 745, slide groove 746, movable shaft 747, piston rod 748, moving rod 749, protective frame 781, cover plate 782, rotating rod limiting mechanism 783, opening plate 784, connecting rod 1 785, pull rod 1 786, cross bar 787, connecting rod 2 788, pull rod 2 789, pull block 7810, limit block 7831, top plate 7832, support plate 7833, bare rod 7834, support plate 7835, spring 7836. DETAILED DESCRIPTION

[0025] The following will be combined with the attached Figure 1-8 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. 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 creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-3The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining of the present invention comprises an air inlet channel 1, an air injection pipe 2, an air outlet channel 3, an air outlet pipe 4, a lower gas production component 5, an upper gas production component 6 and an upper gas production component movement control component 7. The air inlet channel 1 and the air outlet channel 3 extend into the upper coal seam and the lower coal seam. The air inlet channel 1 is vertically provided with an air injection pipe 2, and the air injection pipe 2 injects a gasifying agent into the upper coal seam and the lower coal seam through the air inlet channel 1. The inner middle part of the air outlet channel 3 is provided with an air outlet pipe 4, and the upper and lower sides of the air outlet pipe 4 are respectively provided with The upper gas extraction component 6 and the lower gas extraction component 5, and the lower gas extraction component 5 is fixedly connected to the gas outlet pipe 4, the upper gas extraction component 6 is slidably connected to the gas outlet pipe 4, the upper gas extraction component movement control component 7 is used to control the position of the upper gas extraction component 6, and the upper gas extraction component movement control component 7 includes an outer frame 71, an air inlet pipe 72, a conduit 1 73, an automatic valve component 74, a piston cylinder 75, a piston plate 76, a conduit 2 77, a valve limiting component 78, an exhaust pipe 79, an air flow sensor 710, a vertical pipe 711 and a movable magnetic block 712, the inner right end middle of the outer frame 71 An air intake pipe 72 is provided, the right end of the air intake pipe 72 is connected to the conduit 1 73, the left end of the air intake pipe 72 is connected to the automatic valve assembly 74, the bottom right side of the automatic valve assembly 74 is connected to the piston plate 76, and the piston plate 76 is embedded in the piston cylinder 75, the right end of the piston cylinder 75 is connected to the conduit 2 77, and the outer wall of the piston cylinder 75 is fixedly connected to the outer frame 71, and a valve limiting assembly 78 is installed on the top of the outer frame 71, and the valve limiting assembly 78 is used to limit the opening of the automatic valve assembly 74, and the left end of the automatic valve assembly 74 is connected to the piston plate 76. It is connected to the exhaust pipe 79, and an air flow sensor 710 is installed in the middle of the exhaust pipe 79. The right end of the conduit 1 73 is connected to the vertical pipe 711, and the vertical pipe 711 vertically penetrates the upper gas collection component 6, and the bottom end of the vertical pipe 711 extends into the lower gas collection component 5. A movable magnetic block 712 is arranged inside the vertical pipe 711, and the movable magnetic block 712 and the upper gas collection component 6 are mutually adsorbed. The conduit 2 77 is connected to the upper gas collection component 6. Both the conduit 1 73 and the conduit 2 77 are soft tubes, which is conducive to avoiding affecting the movement of the lower gas collection component 5 and the upper gas collection component 6;

[0027] The upper gas extraction component 6 and the lower gas extraction component 5 have the same structure. The upper gas extraction component 6 includes a movable frame 61, a gas extraction hole 62 and a sealing plate 63. The left side of the movable frame 61 is provided with a gas extraction hole 62. The upper and lower sides of the movable frame 61 are respectively fixed with sealing plates 63. The movable frame 61, the gas extraction hole 62 and the sealing plate 63 of the upper gas extraction component 6 are vertically penetrated by the gas outlet pipe 4 and the vertical pipe 711, and the upper gas extraction component 6 is slidably connected with the gas outlet pipe 4 and the vertical pipe 711. The sealing plate 63 of the upper gas extraction component 6 and the magnetic block 712 are mutually adsorbed. The movable frame 61 of the upper gas extraction component 6 is connected with the conduit 2 77. The movable frame 61 and the gas extraction hole 62 of the lower gas extraction component 5 are respectively fixed with sealing plates 63. The hole 62 and the inner wall of the sealing plate 63 are fixedly connected to the air outlet pipe 4 and the vertical pipe 711, and the bottom end of the vertical pipe 711 is connected to the movable frame 61 of the lower gas production assembly 5. The outer wall of the air outlet channel 3 is provided with air holes, and the air holes correspond to the positions of the upper coal seam and the lower coal seam. The outer wall of the air outlet pipe 4 is provided with air inlet holes, and a one-way valve is installed inside the air hole to prevent backflow of coalbed methane from different coal seams due to different pressures. The coalbed methane of the upper coal seam and the lower coal seam enters into the movable frame 61 through the air holes of the air outlet channel 3 and the gas production holes 62 of the movable frame 61, and the coalbed methane in the movable frame 61 enters into the air outlet pipe 4 through the air inlet holes on the outside of the air outlet pipe 4.

[0028] See also Figure 4-5 The invention relates to the integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining. The automatic valve assembly 74 comprises a valve body 741, a valve stem 742, a valve plate 743, a rotating rod 744, a connecting rod 745, a slide groove 746, a movable shaft 747, a piston rod 748 and a moving rod 749. The valve body 741 is provided with a valve plate 743 inside. The front end of the valve plate 743 is transmission-connected with the valve stem 742. The front end of the valve stem 742 is transmission-connected with the rotating rod 744 and the connecting rod 745. The inner bottom of the connecting rod 745 is opened. A slide groove 746 is provided, and a movable shaft 747 is provided inside the slide groove 746. The movable shaft 747 slides along the inner wall of the slide groove 746, and the movable shaft 747 is connected to the left end of the piston rod 748 and the bottom end of the movable rod 749. The right end of the piston rod 748 extends into the piston cylinder 75 and is connected to the piston plate 76. The left and right sides of the valve body 741 are respectively connected to the exhaust pipe 79 and the intake pipe 72. The top right side of the rotating rod 744 is arranged in an inclined surface, so that when the rotating rod 744 rotates clockwise, it pushes the limit block 7831 to move upward;

[0029] See also Figure 6-8In the integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining of the present invention, the valve limiting assembly 78 includes a protective frame 781, a cover plate 782, a rotating rod limiting mechanism 783, a propping plate 784, a connecting rod 1 785, a pull rod 1 786, a cross bar 787, a connecting rod 2 788, a pull rod 2 789 and a pull block 7810. The top of the protective frame 781 is sealed by the cover plate 782. A rotating rod limiting mechanism 783 is provided on the left side of the bottom end of the protective frame 781, and the rotating rod limiting mechanism 783 is installed on the top of the outer frame 71. A propping plate 784 is provided on the right side of the rotating rod limiting mechanism 783. The top of the propping plate 784 is connected to the connecting rod 1 785, and the connecting rod 1 The top of 785 is connected to the pull rod 1 786, the left end of the rear side of the cross bar 787 is provided with a pull block 7810, and the pull block 7810 is provided on the left side of the connecting rod 1 785, the right end of the cross bar 787 is connected to the connecting rod 2 788, the top of the connecting rod 2 788 is connected to the pull rod 789, and the bottom end of the connecting rod 2 788 is connected to the moving rod 749, the protective frame 781 is installed on the top of the outer frame 71, the bottom end surface of the support plate 784 is fitted with the top of the outer frame 71, the left side of the top of the support plate 784 is inclined, and tilted upward from left to right, so that the support plate 784 moves to the left to push the top plate 7832 to move upward, and the top plate 7832 drives the limit block 7831 to move upward;

[0030] The rotating rod limiting mechanism 783 includes a limiting block 7831, a top plate 7832, a support plate 7833, a light rod 7834, a support plate 7835 and a spring 7836. The top of the limiting block 7831 is fixedly connected to the top plate 7832, the middle part of the outer side of the limiting block 7831 is fixedly connected to the support plate 7833, the limiting block 7831 vertically penetrates the top of the outer frame 71, and the top plate 7832 is arranged at the top of the outer frame 71, the support plate 7833 is arranged inside the outer frame 71, the middle part of the support plate 7833 is vertically penetrated by the light rod 7834, the bottom end of the light rod 7834 is fixedly connected to the support plate 7835, the top of the support plate 7833 is elastically connected to the inner top of the outer frame 71 through the spring 7836, and the spring 7836 is sleeved on the outer side of the light rod 7834.

[0031] The present invention provides an integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-production through improvement, and its working principle is as follows;

[0032] First, the lower gas collection component 5 and the upper gas collection component 6 need to be placed into the gas outlet channel 3. At this time, the valve plate 743 of the automatic valve component 74 is in a closed state, and the gas outlet pipe 4, the lower gas collection component 5 and the upper gas collection component 6 are placed into the gas outlet channel 3;

[0033] Second, open the cover plate 782 and pull the pull rod 1 786 to move to the left. The pull rod 1 786 pushes the support plate 784 to move to the left through the connecting rod 1 785. The support plate 784 moves to the left and pushes the top plate 7832 to move upward, and the top plate 7832 drives the limit block 7831 to move upward, and then pull the pull rod 2 789 to move to the right. The pull rod 2 789 drives the cross bar 787 and the connecting rod 2 788 to move to the right. The connecting rod 2 788 drives the moving rod 749 and the movable shaft 747 to move to the right. The movable shaft 747 moves to the right through the piston rod 7 48 pushes the piston plate 76 to move rightward to the right side inside the piston cylinder 75, and the movable shaft 747 drives the valve stem 742, the valve plate 743 and the rotating rod 744 to rotate counterclockwise through the connecting rod 745, so that the valve plate 743 is opened, and the rotating rod 744 rotates to the left side of the limit block 7831, and the cross bar 787 moves rightward through the pull block 7810 to pull the connecting rod 1 785 and the opening plate 784 to move rightward, disconnecting the support for the top plate 7832, and the elastic potential energy generated by the spring 7836 pushes the limit block 7831 downward, so that the limit block 7831 is lowered;

[0034] Third, the lower gas production component 5 is lowered to the lower coal seam, and the gas injection pipe 2 injects gasification agent into the upper coal seam and the lower coal seam through the air inlet channel 1. At this time, the gas outlet pipe 4 has not started to produce gas, and the coal seam gas of the lower coal seam enters the movable frame 61 through the gas production hole 62 of the lower gas production component 5, and the coal seam gas pressure of the lower coal seam pushes the movable magnetic block 712 inside the vertical pipe 711 to move upward, and the movable magnetic block 712 is adsorbed with the upper gas production component 6, so that the upper gas production component 6 moves upward with the movable magnetic block 712. When the movable magnetic block 712 moves upward, it squeezes the air on the top of the movable magnetic block 712, and the air is discharged through the conduit 73, the air inlet pipe 72, the valve body 741 and the exhaust pipe 79 in turn, and the air is discharged through the air flow sensor 710. When the air discharge is detected, it is determined that the lower gas production component 5 is connected with the lower coal seam, which has the effect of detecting the connection between the lower coal seam and the lower gas production component 5. When moving to the upper coal seam position, the coal seam gas of the upper coal seam enters the movable frame 61 of the upper gas production assembly 6, and the coal seam gas pressure of the upper coal seam acts on the piston plate 76 through the second conduit 77, the piston plate 76 moves to the left along the inner wall of the piston cylinder 75, and the piston plate 76 pushes the movable shaft 747 to move to the left through the piston rod 748, and the movable shaft 747 moves to the left to drive the movable rod 749, the cross bar 787, the second connecting rod 788, the second pull rod 789, and the pull block 7810 to move to the left, and the movable shaft 747 moves to the left to drive the valve stem 742, the valve plate 743, the rotating rod 744 and the connecting rod 745 to rotate clockwise, so that the valve plate 743 is closed, and the rotating rod 744 is rotated to the right side of the limit block 7831, so that the automatic valve assembly 74 remains in a closed state, and a closed space is formed on the top of the movable magnetic block 712, so that the movable magnetic block 712 cannot move, thereby completing the positioning of the upper gas production assembly 6.

[0035] The above shows and describes the basic principle, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0036] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A technology for integrating coalbed methane extraction and underground coal gasification based on dual-gas co-extraction, comprising an air inlet channel (1), an air injection pipe (2), an air outlet channel (3), an air outlet pipe (4), a lower air extraction component (5) and an upper air extraction component (6), wherein the air inlet channel (1) and the air outlet channel (3) extend into the upper coal seam and the lower coal seam, and the air inlet channel (1) is vertically provided with an air injection pipe (2), and the air injection pipe (2) injects a gasifying agent into the upper coal seam and the lower coal seam through the air inlet channel (1). The air outlet pipe (4) is provided in the middle of the air outlet channel (3), and the upper and lower sides of the air outlet pipe (4) are respectively provided with an upper air extraction component (6) and a lower air extraction component (5), and the lower air extraction component (5) is fixedly connected to the air outlet pipe (4), and the upper air extraction component (6) is slidably connected to the air outlet pipe (4); Features: The invention also comprises an upper gas extraction component movement control component (7), wherein the upper gas extraction component movement control component (7) is used to control the position of the upper gas extraction component (6), and the upper gas extraction component movement control component (7) comprises an outer frame (71), an air intake pipe (72), a conduit 1 (73), an automatic valve component (74), a piston cylinder (75), a piston plate (76), a conduit 2 (77), a valve limiting component (78), an exhaust pipe (79), an air flow sensor (710), a vertical pipe (711) and a movable magnetic block (712). An air intake pipe (72) is arranged at the middle of the right end of the inner part of the outer frame (71), the right end of the air intake pipe (72) is connected to the conduit 1 (73), the left end of the air intake pipe (72) is connected to the automatic valve component (74), the bottom right side of the automatic valve component (74) is connected to the piston plate (76), and the piston plate (76) is embedded in the piston cylinder (75). The right end of the piston cylinder (75) is connected to the second conduit (77), and the outer wall of the piston cylinder (75) is fixedly connected to the outer frame (71). A valve limiting assembly (78) is installed on the top of the outer frame (71). The valve limiting assembly (78) is used to limit the opening of the automatic valve assembly (74). The left end of the automatic valve assembly (74) is connected to the exhaust pipe (79). An air flow sensor (710) is installed in the middle of the exhaust pipe (79). The right end of the conduit (73) is connected to a vertical pipe (711). The vertical pipe (711) vertically penetrates the upper gas collection assembly (6), and the bottom end of the vertical pipe (711) extends into the interior of the lower gas collection assembly (5). An active magnetic block (712) is arranged inside the vertical pipe (711), and the active magnetic block (712) and the upper gas collection assembly (6) are mutually attracted. The second conduit (77) is connected to the upper gas collection assembly (6).

2. The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining according to claim 1 is characterized by: The upper gas collection component (6) and the lower gas collection component (5) have the same structure. The upper gas collection component (6) comprises a movable frame (61), a gas collection hole (62) and a sealing plate (63). The left side of the movable frame (61) is provided with a gas collection hole (62). The upper and lower sides of the movable frame (61) are respectively fixed with sealing plates (63). The movable frame (61), the gas collection hole (62) and the sealing plate (63) of the upper gas collection component (6) are vertically penetrated by the gas outlet pipe (4) and the vertical pipe (711). The upper gas collection component (6) is slidably connected to the gas outlet pipe (4) and the vertical pipe (711); the sealing plate (63) of the upper gas collection component (6) and the magnetic block (712) are mutually attracted; the movable frame (61) of the upper gas collection component (6) is connected to the second conduit (77); the movable frame (61), the gas collection hole (62) and the inner wall of the sealing plate (63) of the lower gas collection component (5) are fixedly connected to the gas outlet pipe (4) and the vertical pipe (711); and the bottom end of the vertical pipe (711) is connected to the movable frame (61) of the lower gas collection component (5).

3. The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining according to claim 1 is characterized in that: The automatic valve assembly (74) comprises a valve body (741), a valve stem (742), a valve plate (743), a rotating rod (744), a connecting rod (745), a slide groove (746), a movable shaft (747), a piston rod (748) and a moving rod (749). The valve body (741) is provided with a valve plate (743) inside. The front end of the valve plate (743) is transmission-connected to the valve stem (742). The front end of the valve stem (742) is transmission-connected to the rotating rod (744) and the connecting rod (745). A slide groove (746) is provided at the inner bottom of the rod (745), and a movable shaft (747) is provided inside the slide groove (746). The movable shaft (747) slides along the inner wall of the slide groove (746), and the movable shaft (747) is connected to the left end of the piston rod (748) and the bottom end of the movable rod (749). The right end of the piston rod (748) extends into the piston cylinder (75) and is connected to the piston plate (76). The left and right sides of the valve body (741) are respectively connected to the exhaust pipe (79) and the intake pipe (72).

4. The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining according to claim 1 is characterized by: The valve limiting assembly (78) comprises a protective frame (781), a cover plate (782), a rotating rod limiting mechanism (783), an opening plate (784), a connecting rod 1 (785), a pull rod 1 (786), a cross bar (787), a connecting rod 2 (788), a pull rod 2 (789) and a pull block (7810). The top of the protective frame (781) is sealed by the cover plate (782). The rotating rod limiting mechanism (783) is arranged on the left side of the bottom end of the protective frame (781), and the rotating rod limiting mechanism (783) is installed on the top of the outer frame (71). The opening plate (784) is arranged on the right side of the rotating rod limiting mechanism (783). Plate (784), the top end of the support plate (784) is connected to the connecting rod 1 (785), and the top end of the connecting rod 1 (785) is connected to the pull rod 1 (786), a pull block (7810) is arranged at the left end of the rear side of the cross bar (787), and the pull block (7810) is arranged on the left side of the connecting rod 1 (785), the right end of the cross bar (787) is connected to the connecting rod 2 (788), the top end of the connecting rod 2 (788) is connected to the pull rod (789), and the bottom end of the connecting rod 2 (788) is connected to the moving rod (749), and the protective frame (781) is installed on the top of the outer frame (71).

5. The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining according to claim 4 is characterized by: The rotating rod limiting mechanism (783) comprises a limiting block (7831), a top plate (7832), a support plate (7833), a bare rod (7834), a support plate (7835) and a spring (7836); the top end of the limiting block (7831) is fixedly connected to the top plate (7832); the middle part of the outer side of the limiting block (7831) is fixedly connected to the support plate (7833); the limiting block (7831) vertically penetrates the top of the outer frame (71); and the top plate (7832) is fixedly connected to the support plate (7833). (7832) is arranged at the top of the outer frame (71), the support plate (7833) is arranged inside the outer frame (71), the middle part of the support plate (7833) is vertically penetrated by the light rod (7834), the bottom end of the light rod (7834) is fixedly connected to the support plate (7835), the top of the support plate (7833) is elastically connected to the inner top of the outer frame (71) through a spring (7836), and the spring (7836) is mounted on the outer side of the light rod (7834).

6. The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining according to claim 1 is characterized in that: The outer wall of the gas outlet channel (3) is provided with air holes, and the positions of the air holes correspond to the upper coal seam and the lower coal seam. The outer wall of the gas outlet pipe (4) is provided with air inlet holes.

7. The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-mining according to claim 3 is characterized by: The top right side of the rotating rod (744) is arranged in an inclined surface.

8. The integrated technology of coalbed methane extraction and underground coal gasification based on dual-gas co-production according to claim 4 is characterized by: The bottom end surface of the support plate (784) is in contact with the top of the outer frame (71), and the left side of the top end of the support plate (784) is inclined and tilts upward from left to right.

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