Drainage device for coal bed gas development and using method thereof

Abstract

The invention relates to the technical field of coalbed methane development drainage devices, and provides a drainage device for coalbed methane development and a using method thereof.The drainage device comprises a liquid storage tank, a gas conveying assembly used for conveying coalbed methane is arranged on the upper side of the liquid storage tank, and after an induced draft fan is started, a T-shaped rod can drive a third gas conveying pipe to rotate; a third gas conveying pipe drives a fourth gas conveying pipe to rotate through a connecting rod, and a plurality of inclined flow guide plates in the fourth gas conveying pipe synchronously and rapidly revolve, so that liquid entering the fourth gas conveying pipe from the liquid-gas mixing pipe can flow into the fourth gas conveying pipe under the action of centrifugal force and the guide of the inclined flow guide plates; the gas is conveyed forwards by being tightly attached to the inner wall of the fourth gas conveying pipe, and the gas mainly flows in the center of the fourth gas conveying pipe, at the moment, after the induced draft fan is started, the gas in the fourth gas conveying pipe enters the second gas conveying pipe through the third gas conveying pipe through suction force, and is finally discharged into the first gas conveying pipe through the gas outlet end of the induced draft fan to be conveyed; and the gas transmission efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage devices for coalbed methane development, and in particular to a drainage device for coalbed methane development and a method of using the drainage device. Background Art

[0002] Coalbed methane refers to hydrocarbon gas with methane as the main component, which is mainly adsorbed on the surface of coal matrix particles, and partially free in coal pores or dissolved in coalbed water. It is a semi-raw mineral resource of coal and an unconventional natural gas. Coalbed methane is self-generated and self-stored, and coal seams are both gas source rocks and reservoir rocks. Coalbed methane is mainly present in coal pores in an adsorbed state (70% to 95%), a small amount exists freely in cleats and other cracks or pores in a free state (10% to 20%), and a very small amount exists in groundwater in the coal seam in a dissolved state.

[0003] In the traditional coalbed methane mining process, the coalbed methane is often transported by a gas pipeline. In order to facilitate the discharge of moisture in the coalbed methane, a water storage cylinder is often installed on the gas pipeline to collect and discharge the moisture in the gas pipeline. For example, after searching, a drainage device for coalbed methane development disclosed in an existing patent (Announcement No.: CN216110653U) includes a gas pipeline, a connecting pipe connected to the gas pipeline is installed at the lower position of the outer surface of the gas pipeline, a first stop valve is installed at the lower end of the connecting pipe, a pipe joint is fixedly connected to the lower end of the first stop valve, and the lower end of the pipe joint is connected to the water storage cylinder, and the water storage cylinder is used to store liquid.

[0004] However, in the above drainage scheme, the gas transmission efficiency is low, the water removal degree is insufficient, and the coal seam water entering the water storage frame is mixed with a large amount of gas. Moreover, it is difficult to remove the gas mixed in the coal seam water and the gas located in the water storage frame, which easily causes the gas to leak directly into the external environment, causing energy waste and safety hazards. It is often necessary to equip a large drying tower for gas collection, which has high construction and investment costs and is difficult to construct.

[0005] In view of this, the present invention proposes a drainage device for coalbed methane development and a method of using the same. Summary of the invention

[0006] The present invention provides a drainage device for coalbed methane development and a method for using the same, which solves the problems of low gas transmission efficiency and insufficient water removal in the drainage device for coalbed methane development in the related art.

[0007] The technical solution of the present invention is as follows: A drainage device for coalbed methane development, comprising: a liquid storage tank, a gas delivery assembly for delivering coalbed methane is arranged on the upper side of the liquid storage tank, a bracket is fixedly connected to the outer wall of the liquid storage tank, and an induced draft fan is fixedly installed on the top of the bracket for accelerating the airflow delivered to the inner side of the gas delivery assembly;

[0008] The gas delivery assembly comprises a fourth gas delivery pipe, a third gas delivery pipe, a second gas delivery pipe and a first gas delivery pipe which are sequentially distributed in a straight line from left to right, the first gas delivery pipe and the second gas delivery pipe are respectively fixedly connected with the gas outlet port and the gas inlet port of the induced draft fan, a plurality of connecting rods are fixedly connected between the third gas delivery pipe and the fourth gas delivery pipe, the outer walls of a port of the third gas delivery pipe and the fourth gas delivery pipe close to each other are fixedly sleeved with a hollow frustum, and the inner wall of the fourth gas delivery pipe is fixedly connected with an oblique guide plate in a ring array;

[0009] A T-shaped rod is fixedly connected to the center of the impeller inside the induced draft fan, and the T-shaped rod passes through the air inlet port of the induced draft fan and is fixedly connected to the inner wall of the third air delivery pipe;

[0010] An outer cabin is arranged outside the third gas delivery pipe, the second gas delivery pipe is fixedly sleeved on one end of the outer cabin, the hollow frustum is rotatably sleeved inside the outer cabin, and the inside of the outer cabin is partitioned by the two hollow frustums;

[0011] A flow guide assembly is provided between the outer chamber and the liquid storage tank, for guiding the liquid in the outer chamber to the interior of the liquid storage tank;

[0012] A filtering mechanism is provided on one side of the flow guide component, for filtering the liquid flowing through the inner side of the flow guide component;

[0013] A gas collection component is provided between the outer cabin and the liquid storage tank, for collecting the coalbed methane inside the liquid storage tank into the inner side of the outer cabin.

[0014] Preferably, a liquid-gas mixing pipe connected to the fourth gas pipe is provided on a side of the outer cabin away from the induced draft fan, and a connector is fixedly connected to one end of the liquid-gas mixing pipe, and the connector is rotatably connected to the fourth gas pipe.

[0015] Preferably, a guide cavity is provided inside the third gas delivery pipe, the guide cavity is truncated cone-shaped, and the inner diameter of the left port of the guide cavity is greater than the inner diameter of the right port.

[0016] Preferably, an outer wall of the third gas delivery pipe located on the left side of the hollow frustum is evenly provided with annular grooves, and an inner wall of the outer cabin located on the lower side of the connecting rod is provided with a converging groove.

[0017] Preferably, the diversion assembly includes an inclined conduit fixedly mounted on the top of the liquid storage tank, the inclined conduit is connected to the confluence trough, the bottom end of the inclined conduit is fixedly connected to a diversion pipe, and a Tesla valve pipe is arranged in the middle of the diversion pipe.

[0018] Preferably, the filtering mechanism comprises a dirt collecting box fixedly connected to the outer wall of the inclined conduit, the bottom of the dirt collecting box is obliquely provided with an inclined bottom plate, and the outer wall of the inclined conduit is penetrated by a first placement groove and a second placement groove connected to the inner side of the dirt collecting box.

[0019] Preferably, the filtering mechanism further comprises a filter screen and a mesh plate, the filter screen is obliquely arranged inside the second placement groove, and the mesh plate is vertically arranged inside the first placement groove.

[0020] Preferably, the air collecting assembly includes an air collecting pipe fixedly connected to the bottom of the outer cabin, the air collecting pipe is located between the second air supply pipe and the third air supply pipe, the lower port of the air collecting pipe is fixedly connected to an air collecting hood, and a wire mesh column is sleeved inside the air collecting pipe.

[0021] Preferably, a liquid level sensor is provided inside the liquid storage tank, and a collision plate is fixedly connected to the bottom of the liquid storage tank. The collision plate is provided on one side of the lower port of the first air supply pipe and is used for collision impact of the liquid sprayed from the lower port of the guide pipe.

[0022] A method for using a drainage device for coalbed methane development comprises the following steps:

[0023] Step 1: After the device is assembled, the coalbed methane begins to be transported through the liquid-gas mixing pipe, and the gas-liquid mixture discharged from the liquid-gas mixing pipe enters the fourth gas transmission pipe;

[0024] Step 2: Start the induced draft fan. The motor on the induced draft fan drives the impeller inside it to rotate at high speed, generating suction, sucking the second air pipeline through the air inlet end of the induced draft fan, and discharging the sucked gas into the first air pipeline through the air outlet end of the induced draft fan for further transportation;

[0025] Step 3, after the induced draft fan is started, the impeller on the induced draft fan drives the T-bar to rotate, the T-bar drives the third air pipe to rotate, the third air pipe drives the fourth air pipe to rotate through the connecting rod, and when the fourth air pipe and the third air pipe rotate, they are respectively supported by the hollow cone for rotation, and during the rotation of the fourth air pipe, it can drive the multiple oblique guide plates inside it to perform synchronous and rapid revolution, so that the liquid entering the fourth air pipe from the liquid-gas mixing pipe can be transported forward closely to the inner wall of the fourth air pipe under the action of centrifugal force and the guidance of the oblique guide plates, while the gas mainly flows at the center of the fourth air pipe. At this time, after the induced draft fan is started, the suction force causes the gas inside the fourth air pipe to enter the second air pipe through the third air pipe, and finally be discharged into the first air pipe through the air outlet of the induced draft fan for transportation;

[0026] Step 4: The liquid ejected from the right end of the fourth gas pipeline will fall into the outer cabin, and a very small part of the liquid will enter the third gas pipeline. However, under the action of the guide cavity provided inside the third gas pipeline, the liquid will flow back to the outer cabin. Some of the liquid will also be ejected to the outer side of the hollow cone sleeved on the outer wall of the third gas pipeline. After being blocked by the hollow cone, the liquid will flow back to the outer cabin through the annular groove. Finally, the liquid will be collected through the confluence groove and discharged into the liquid storage tank through the guide assembly for storage. Some of the overflowing gas will be blocked by the hollow cone and the suction generated inside the third gas pipeline, and will be sent to the third gas pipeline for transportation.

[0027] Step 5. Some of the gas dissolved in the coal seam water will enter the liquid storage tank along the inclined conduit and the guide pipe. Of course, a small amount of gas that overflows from the port of the fourth gas pipeline but does not enter the third gas pipeline will also enter the liquid storage tank through the inclined conduit and the guide pipe. In this process, the coal seam water with dissolved gas will first collide with the filter screen, which can not only filter the impurities in the coal seam water and roll them into the dirt collection box for collection, but also collide with the gas in the liquid to overflow, so that the gas can be sucked through the third gas pipeline;

[0028] Step six, the coalbed water entering the guide pipe will be accelerated by the Tesla valve tube so that it can rush out quickly through the guide pipe port. The liquid is collected at the bottom of the liquid storage tank under the action of gravity, while the gas floats to the upper space inside the liquid storage tank. At this time, the suction force inside the second gas pipe acts on the upper port of the gas manifold, so that the gas floating on the upper side of the liquid storage tank can be transported to the inside of the second gas pipe through the gas manifold, and the wire mesh column arranged on the inside of the gas manifold can condense and fall the water vapor well.

[0029] The working principle and beneficial effects of the present invention are:

[0030] 1. In the present invention, a gas delivery assembly for delivering coalbed methane is arranged on the upper side of the liquid storage tank. The coalbed methane begins to be delivered through the liquid-gas mixing pipe. The gas-liquid mixture discharged from the liquid-gas mixing pipe enters the fourth gas delivery pipe. After the induced draft fan is started, the T-bar is driven to rotate. The T-bar drives the third gas delivery pipe to rotate. The third gas delivery pipe drives the fourth gas delivery pipe to rotate through the connecting rod. When the fourth gas delivery pipe and the third gas delivery pipe rotate, they are respectively supported by the hollow cone for rotation. During the rotation of the fourth gas delivery pipe, The multiple oblique guide plates inside the fourth gas pipeline are driven to perform synchronous and rapid revolution, so that the liquid entering the fourth gas pipeline from the liquid-gas mixing pipe can be transported forward closely to the inner wall of the fourth gas pipeline under the action of centrifugal force and the guidance of the oblique guide plates, while the gas mainly flows at the center of the fourth gas pipeline. At this time, after the induced draft fan is started, the suction force causes the gas inside the fourth gas pipeline to enter the second gas pipeline through the third gas pipeline, and finally be discharged into the first gas pipeline through the gas outlet end of the induced draft fan for transportation, which greatly improves the gas transmission efficiency;

[0031] 2. In the present invention, the liquid ejected from the right end of the fourth gas pipe will fall into the outer chamber, and a small portion of the liquid will enter the third gas pipe. However, under the action of the guide cavity provided in the third gas pipe, the liquid will flow back to the outer chamber. Some of the liquid will also be ejected to the outer side of the hollow cone sleeved on the outer wall of the third gas pipe. After being blocked by the hollow cone, the liquid will flow back to the outer chamber through the annular groove. The hollow cone can effectively block the liquid.

[0032] 3. In the present invention, the liquid that flows back to the outer cabin is collected by the confluence trough and then discharged into the liquid storage tank through the guide assembly for storage, while part of the overflowing gas will be blocked by the hollow cone and the suction force generated inside the third gas pipe, and will be sent to the third gas pipe for transportation. Part of the gas dissolved in the coal seam water will enter the liquid storage tank along the inclined conduit and the guide pipe. Of course, a very small part of the gas that overflows from the port of the fourth gas pipe but does not enter the third gas pipe will also enter the liquid storage tank through the inclined conduit and the guide pipe. In this process, the coal seam water with dissolved gas will first collide with the filter screen, which can not only filter the impurities in the coal seam water and roll them into the dirt collecting box for collection, but also collide with the gas in the liquid to overflow, so that the gas can be sucked through the third gas pipe, greatly improving the degree of gas dehydration;

[0033] 4. In the present invention, the coal seam water entering the guide pipe will be accelerated by the Tesla valve pipe so that it can rush out quickly through the guide pipe port. The liquid is collected at the bottom of the liquid storage tank under the action of gravity, while the gas floats to the upper space inside the liquid storage tank. At this time, the suction force inside the second gas transmission pipe acts on the upper port of the gas collection pipe, so that the gas floating on the upper side of the liquid storage tank can be transported to the inside of the second gas transmission pipe through the gas collection pipe, and the wire mesh column arranged on the inner side of the gas collection pipe can condense and fall the water vapor well, so as to further improve the gas transmission efficiency and the degree of water removal. The unique design of the present invention does not rely on any external energy except the induced draft fan, and can efficiently remove the liquid in the natural gas without the need to set up a large drying tower, which greatly saves costs and has high use value. It has broad application prospects in the field of coal gas layer development. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Figure 1 This is a schematic diagram of the three-dimensional structure of a drainage device for coalbed methane development proposed by the present invention;

[0036] Figure 2 This is a partial cross-sectional structural schematic diagram of a drainage device for coalbed methane development proposed by the present invention;

[0037] Figure 3 A schematic diagram of the internal structure of the Tesla valve tube proposed in the present invention;

[0038] Figure 4 This is a schematic diagram of the assembly structure of the gas transmission component proposed by the present invention;

[0039] Figure 5 for Figure 2 The enlarged structural diagram at A in the middle;

[0040] Figure 6 for Figure 2 The enlarged structural diagram at B in the middle;

[0041] Figure 7 for Figure 4 The enlarged structural diagram at C in the middle;

[0042] In the figure: 1. liquid storage tank; 11. liquid level sensor; 12. collision plate; 2. bracket; 3. gas collection assembly; 31. gas collection cover; 32. gas collection pipe; 33. wire mesh column; 4. flow guide assembly; 41. flow guide pipe; 42. Tesla valve pipe; 43. oblique guide tube; 431. first placement groove; 432. second placement groove; 5. induced draft fan; 51. T-bar; 6. gas delivery assembly; 61. first gas delivery pipe; 62. second gas delivery pipe; 63. third gas delivery pipe; 631. guide cavity; 632. annular groove; 64. fourth gas delivery pipe; 65. hollow cone; 66. oblique guide plate; 67. connecting rod; 7. outer cabin; 71. confluence groove; 8. filtering mechanism; 81. dirt collecting box; 82. oblique bottom plate; 83. filter screen; 84. mesh plate; 9. liquid-gas mixing pipe; 91. connector. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0044] Example 1

[0045] See also Figure 1 , Figure 2 , Figure 4 as well as Figure 5 A drainage device for coalbed methane development includes: a liquid storage tank 1, a gas delivery component 6 for delivering coalbed methane is arranged on the upper side of the liquid storage tank 1, a bracket 2 is fixedly connected to the outer wall of the liquid storage tank 1, and a draft fan 5 is fixedly installed on the top of the bracket 2 for accelerating the airflow delivered to the inner side of the gas delivery component 6.

[0046] Specifically, the gas delivery assembly 6 includes a fourth gas delivery pipe 64, a third gas delivery pipe 63, a second gas delivery pipe 62 and a first gas delivery pipe 61 which are arranged in a straight line from left to right. The first gas delivery pipe 61 and the second gas delivery pipe 62 are fixedly connected to the gas outlet port and the gas inlet port of the induced draft fan 5 respectively. A plurality of connecting rods 67 are fixedly connected between the third gas delivery pipe 63 and the fourth gas delivery pipe 64. A hollow frustum 65 is fixedly sleeved on the outer wall of a port where the third gas delivery pipe 63 and the fourth gas delivery pipe 64 are close to each other, and an oblique guide plate 66 is fixedly connected to the inner wall of the fourth gas delivery pipe 64 in a ring array.

[0047] Furthermore, a T-shaped rod 51 is fixed at the center of the impeller inside the induced draft fan 5, and the T-shaped rod 51 passes through the air inlet port of the induced draft fan 5 and is fixed to the inner wall of the third air delivery pipe 63. A guide cavity 631 is provided inside the third air delivery pipe 63, and the guide cavity 631 is in a truncated cone shape, and the inner diameter of the left port of the guide cavity 631 is larger than the inner diameter of the right port. The outer wall of the third air delivery pipe 63 located on the left side of the hollow cone 65 is evenly provided with annular grooves 632, and the inner wall of the outer cabin 7 located on the lower side of the connecting rod 67 is provided with a converging groove 71.

[0048] Furthermore, an outer cabin 7 is provided outside the third gas delivery pipe 63, the second gas delivery pipe 62 is fixedly sleeved at one end of the outer cabin 7, and a hollow cone 65 is rotatably sleeved inside the outer cabin 7, and the inside of the outer cabin 7 is partitioned by two hollow cones 65. A liquid-gas mixing pipe 9 connected to the fourth gas delivery pipe 64 is provided on the side of the outer cabin 7 away from the induced draft fan 5, and a connector 91 is fixedly connected to one end of the liquid-gas mixing pipe 9, and the connector 91 is rotatably connected to the fourth gas delivery pipe 64.

[0049] In this embodiment, coalbed methane begins to enter and be transported through the liquid-gas mixing pipe 9, and the gas-liquid mixture discharged from the liquid-gas mixing pipe 9 enters the fourth gas pipeline 64. Next, the induced draft fan 5 is started, and the motor on the induced draft fan 5 drives the impeller inside it to rotate at a high speed, generating suction, and the second gas pipeline 62 is sucked through the air inlet end of the induced draft fan 5, and the sucked gas is discharged into the first gas pipeline 61 through the air outlet end of the induced draft fan 5 for further transportation.

[0050] In this embodiment, after the induced draft fan 5 is started, the impeller on the induced draft fan 5 drives the T-bar 51 to rotate, the T-bar 51 drives the third air pipe 63 to rotate, and the third air pipe 63 drives the fourth air pipe 64 to rotate through the connecting rod 67. When the fourth air pipe 64 and the third air pipe 63 rotate, they are respectively supported by the hollow cone 65 for rotation. During the rotation of the fourth air pipe 64, it can drive the multiple oblique guide plates 66 inside it to rotate synchronously and rapidly, so that the liquid entering the fourth air pipe 64 from the liquid-gas mixing pipe 9 can be transported forward closely to the inner wall of the fourth air pipe 64 under the action of centrifugal force and the guidance of the oblique guide plates 66, while the gas mainly flows at the center of the fourth air pipe 64. At this time, after the induced draft fan 5 is started, the suction force causes the gas inside the fourth air pipe 64 to enter the second air pipe 62 through the third air pipe 63, and finally be discharged into the first air pipe 61 through the air outlet of the induced draft fan 5 for transportation.

[0051] In this embodiment, the liquid ejected from the right end of the fourth air pipe 64 will fall into the outer chamber 7, and a very small portion of the liquid enters the third air pipe 63, but under the action of the guide cavity 631 opened in the third air pipe 63, it flows back to the outer chamber 7, and some of the liquid is ejected to the outside of the hollow cone 65 mounted on the outer wall of the third air pipe 63. After being blocked by the hollow cone 65, the liquid flows back to the outer chamber 7 through the annular groove 632.

[0052] Example 2

[0053] See also Figure 1 , Figure 2 , Figure 3 , Figure 6 as well as Figure 7 , a drainage device for coalbed methane development, including all the contents of embodiment 1, in addition, a flow guide component 4 is provided between the outer chamber 7 and the liquid storage tank 1, for guiding the liquid in the outer chamber 7 to the inside of the liquid storage tank 1. A filter mechanism 8 is provided on one side of the flow guide component 4, for filtering the liquid flowing through the inner side of the flow guide component 4. A gas collection component 3 is provided between the outer chamber 7 and the liquid storage tank 1, for collecting the coalbed methane in the liquid storage tank 1 to the inner side of the outer chamber 7.

[0054] Specifically, the flow guide assembly 4 includes an inclined conduit 43 fixedly sleeved on the top of the liquid storage tank 1, the inclined conduit 43 is connected to the confluence groove 71, the bottom end of the inclined conduit 43 is fixedly connected to the flow guide pipe 41, and the middle of the flow guide pipe 41 is provided with a Tesla valve pipe 42. A liquid level sensor 11 is provided inside the liquid storage tank 1, and a collision plate 12 is fixedly connected to the bottom of the liquid storage tank 1. The collision plate 12 is provided on one side of the lower port of the first gas transmission pipe 61, and is used for the liquid sprayed from the lower port of the flow guide pipe 41 to collide and impact.

[0055] Specifically, the filtering mechanism 8 includes a dirt collecting box 81 fixed to the outer wall of the inclined conduit 43 , a bottom plate 82 is obliquely arranged at the bottom of the dirt collecting box 81 , and a first placement groove 431 and a second placement groove 432 are formed through the outer wall of the inclined conduit 43 and communicate with the inner side of the dirt collecting box 81 .

[0056] Furthermore, the filter mechanism 8 also includes a filter screen 83 and a mesh plate 84 . The filter screen 83 is obliquely disposed inside the second placement groove 432 , and the mesh plate 84 is vertically disposed inside the first placement groove 431 .

[0057] Specifically, the air collecting assembly 3 includes an air collecting pipe 32 fixedly connected to the bottom of the outer cabin 7, the air collecting pipe 32 is located between the second air supply pipe 62 and the third air supply pipe 63, the lower end of the air collecting pipe 32 is fixedly connected to the air collecting hood 31, and a wire mesh column 33 is sleeved inside the air collecting pipe 32.

[0058] In this embodiment, the liquid flowing back to the outer chamber 7 is collected through the confluence groove 71 and then discharged into the liquid storage tank 1 through the guide assembly 4 for storage, while part of the overflowing gas will be blocked by the hollow cone 65 and the suction force generated inside the third gas pipe 63, and will be sent to the third gas pipe 63 for transportation. Part of the gas dissolved in the coal seam water will enter the liquid storage tank 1 along the inclined conduit 43 and the guide pipe 41. Of course, a small part of the gas that overflows from the port of the fourth gas pipe 64 but does not enter the third gas pipe 63 will also enter the liquid storage tank 1 through the inclined conduit 43 and the guide pipe 41. In this process, the coal seam water with dissolved gas will first collide with the filter screen 83, which can not only filter the impurities in the coal seam water and roll them into the dirt collecting box 81 for collection, but also collide with the gas in the liquid to overflow, so that the gas can be sucked through the third gas pipe 63.

[0059] In this embodiment, the coalbed water entering the guide pipe 41 will be accelerated by the Tesla valve tube 42 so that it can rush out quickly through the port of the guide pipe 41. The liquid is collected at the bottom of the liquid storage tank 1 under the action of gravity, while the gas floats to the upper space inside the liquid storage tank 1. At this time, the suction force inside the second gas pipe 62 acts on the upper port of the gas collection pipe 32, so that the gas floating on the upper side of the liquid storage tank 1 can be transported to the inside of the second gas pipe 62 through the gas collection pipe 32, and the wire mesh column 33 arranged on the inner side of the gas collection pipe 32 can condense and fall the water vapor well.

[0060] Working principle and use process: First, after the device is assembled, coalbed methane begins to enter and be transported through the liquid-gas mixing pipe 9, and the gas-liquid mixture discharged from the liquid-gas mixing pipe 9 enters the fourth gas pipeline 64. The induced draft fan 5 is started, and the motor on the induced draft fan 5 drives the impeller inside it to rotate at a high speed, generating suction, and the second gas pipeline 62 is sucked through the air inlet end of the induced draft fan 5, and the sucked gas is discharged into the first gas pipeline 61 through the air outlet end of the induced draft fan 5 for further transportation.

[0061] After the induced draft fan 5 is started, the impeller on the induced draft fan 5 drives the T-bar 51 to rotate, the T-bar 51 drives the third air pipe 63 to rotate, and the third air pipe 63 drives the fourth air pipe 64 to rotate through the connecting rod 67. When the fourth air pipe 64 and the third air pipe 63 rotate, they are respectively supported for rotation by the hollow cone 65. During the rotation of the fourth air pipe 64, the multiple oblique guide plates 66 inside it can be driven to revolve synchronously and rapidly, so that the liquid entering the fourth air pipe 64 from the liquid-gas mixing pipe 9 can be transported forward closely to the inner wall of the fourth air pipe 64 under the action of centrifugal force and the guidance of the oblique guide plates 66, while the gas mainly flows at the center of the fourth air pipe 64. At this time, after the induced draft fan 5 is started, the suction force causes the gas inside the fourth air pipe 64 to enter the second air pipe 62 through the third air pipe 63, and finally be discharged into the first air pipe 61 through the air outlet end of the induced draft fan 5 for transportation.

[0062] The liquid ejected from the right end of the fourth air pipe 64 will fall into the outer chamber 7, and a very small portion of the liquid enters the third air pipe 63. However, under the action of the guide cavity 631 opened inside the third air pipe 63, it flows back to the outer chamber 7. Some of the liquid is ejected to the outside of the hollow cone 65 sleeved on the outer wall of the third air pipe 63. After being blocked by the hollow cone 65, the liquid flows back to the outer chamber 7 through the annular groove 632. Finally, the liquid is collected through the confluence groove 71 and discharged into the liquid storage tank 1 through the guide component 4 for storage. Some of the overflowing gas will be blocked by the hollow cone 65 and the suction generated inside the third air pipe 63, and will be sent to the third air pipe 63 for transportation. Part of the gas dissolved in the coalbed water will enter the liquid storage tank 1 along the inclined conduit 43 and the guide tube 41. Of course, a small amount of gas that overflows from the port of the fourth gas pipe 64 but does not enter the third gas pipe 63 will also enter the liquid storage tank 1 through the inclined conduit 43 and the guide tube 41. During this process, the coalbed water containing dissolved gas will first collide with the filter screen 83, which can not only filter the impurities in the coalbed water and then roll them into the dirt collecting box 81 for collection, but also collide with the gas in the liquid to overflow, so that the gas can be sucked through the third gas pipe 63.

[0063] The coalbed water entering the guide pipe 41 will be accelerated by the Tesla valve pipe 42, so that it can rush out quickly through the port of the guide pipe 41, and the liquid is collected at the bottom of the liquid storage tank 1 under the action of gravity, while the gas floats to the upper space inside the liquid storage tank 1. At this time, the suction force inside the second gas pipe 62 acts on the upper port of the gas collection pipe 32, so that the gas floating on the upper side of the liquid storage tank 1 can be transported to the inside of the second gas pipe 62 through the gas collection pipe 32, and the wire mesh column 33 arranged on the inner side of the gas collection pipe 32 can condense and fall the water vapor well.

[0064] It is worth noting that the circuits, electronic components and modules involved in the present invention are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to software and methods.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drainage device for coalbed methane development, comprising: A liquid storage tank (1), characterized in that a gas delivery assembly (6) for delivering coalbed methane is arranged on the upper side of the liquid storage tank (1), a bracket (2) is fixedly connected to the outer wall of the liquid storage tank (1), and an induced draft fan (5) is fixedly installed on the top of the bracket (2) for accelerating the airflow delivered to the inner side of the gas delivery assembly (6); The gas delivery assembly (6) comprises a fourth gas delivery pipe (64), a third gas delivery pipe (63), a second gas delivery pipe (62) and a first gas delivery pipe (61) which are arranged in a straight line from left to right, the first gas delivery pipe (61) and the second gas delivery pipe (62) are fixedly connected to the gas outlet port and the gas inlet port of the induced draft fan (5) respectively, a plurality of connecting rods (67) are fixedly connected between the third gas delivery pipe (63) and the fourth gas delivery pipe (64), the outer walls of the ports of the third gas delivery pipe (63) and the fourth gas delivery pipe (64) close to each other are fixedly sleeved with a hollow frustum (65), and the inner wall of the fourth gas delivery pipe (64) is fixedly connected with an oblique guide plate (66) in a ring array; A T-shaped rod (51) is fixedly connected at the center of the impeller inside the induced draft fan (5), and the T-shaped rod (51) passes through the air inlet port of the induced draft fan (5) and is fixedly connected to the inner wall of the third air delivery pipe (63); An outer chamber (7) is arranged outside the third gas delivery pipe (63); the second gas delivery pipe (62) is fixedly sleeved on one end of the outer chamber (7); the hollow frustum (65) is rotatably sleeved inside the outer chamber (7); and the interior of the outer chamber (7) is partitioned by the two hollow frustums (65); A flow guide component (4) is provided between the outer chamber (7) and the liquid storage tank (1), and is used to guide the liquid in the outer chamber (7) to the interior of the liquid storage tank (1); A filtering mechanism (8) is provided on one side of the flow guiding component (4) for filtering the liquid flowing through the inner side of the flow guiding component (4); A gas collection component (3) is provided between the outer chamber (7) and the liquid storage tank (1) for collecting the coal bed gas inside the liquid storage tank (1) into the inner side of the outer chamber (7).

2. A drainage device for coalbed methane development according to claim 1, characterized in that: A liquid-gas mixing pipe (9) connected to the fourth gas supply pipe (64) is provided on a side of the outer cabin (7) away from the induced draft fan (5); a connector (91) is fixedly connected to one end of the liquid-gas mixing pipe (9); and the connector (91) is rotatably connected to the fourth gas supply pipe (64).

3. A drainage device for coalbed methane development according to claim 2, characterized in that: A guide cavity (631) is provided inside the third gas delivery pipe (63), the guide cavity (631) is in a truncated cone shape, and the inner diameter of the left port of the guide cavity (631) is greater than the inner diameter of the right port.

4. A drainage device for coalbed methane development according to claim 3, characterized in that: The outer wall of the third gas delivery pipe (63) located on the left side of the hollow cone (65) is evenly provided with annular grooves (632), and the inner wall of the outer cabin (7) located on the lower side of the connecting rod (67) is provided with a converging groove (71).

5. A drainage device for coalbed methane development according to claim 4, characterized in that: The flow guide assembly (4) comprises an inclined conduit (43) fixedly sleeved on the top of the liquid storage tank (1), the inclined conduit (43) being connected to the confluence groove (71), the bottom end of the inclined conduit (43) being fixedly connected to a flow guide pipe (41), and a Tesla valve pipe (42) being arranged in the middle of the flow guide pipe (41).

6. A drainage device for coalbed methane development according to claim 5, characterized in that: The filtering mechanism (8) comprises a dirt collecting box (81) fixedly connected to the outer wall of the inclined conduit (43); an inclined bottom plate (82) is obliquely arranged at the bottom of the dirt collecting box (81); and a first placement groove (431) and a second placement groove (432) are penetrated through the outer wall of the inclined conduit (43) and communicated with the inner side of the dirt collecting box (81).

7. A drainage device for coalbed methane development according to claim 6, characterized in that: The filtering mechanism (8) further comprises a filtering net (83) and a mesh plate (84); the filtering net (83) is arranged obliquely inside the second placement groove (432), and the mesh plate (84) is arranged vertically inside the first placement groove (431).

8. A drainage device for coalbed methane development according to claim 7, characterized in that: The air collection assembly (3) comprises an air collection pipe (32) fixedly connected to the bottom of the outer cabin (7); the air collection pipe (32) is located between the second air supply pipe (62) and the third air supply pipe (63); a lower end of the air collection pipe (32) is fixedly connected to an air collecting hood (31); and a steel wire mesh column (33) is sleeved inside the air collection pipe (32).

9. A drainage device for coalbed methane development according to claim 8, characterized in that: A liquid level sensor (11) is arranged inside the liquid storage tank (1), and a collision plate (12) is fixedly connected to the bottom of the liquid storage tank (1). The collision plate (12) is arranged on one side of the lower end of the first air delivery pipe (61) and is used for collision impact of the liquid sprayed from the lower end of the guide pipe (41).

10. A method for using a drainage device for coalbed methane development, characterized in that: The following steps are involved: Step 1: After the device is assembled, the coalbed methane begins to be transported through the liquid-gas mixing pipe (9), and the gas-liquid mixture discharged from the liquid-gas mixing pipe (9) enters the fourth gas transmission pipe (64); Step 2: Start the induced draft fan (5), and the motor on the induced draft fan (5) drives the impeller inside the induced draft fan (5) to rotate at a high speed, thereby generating suction, and sucking the second air delivery pipe (62) through the air inlet end of the induced draft fan (5), and discharging the sucked gas into the first air delivery pipe (61) through the air outlet end of the induced draft fan (5) for further transportation; Step 3: After the induced draft fan (5) is started, the impeller on the induced draft fan (5) drives the T-shaped rod (51) to rotate, the T-shaped rod (51) drives the third air supply pipe (63) to rotate, the third air supply pipe (63) drives the fourth air supply pipe (64) to rotate through the connecting rod (67), and when the fourth air supply pipe (64) and the third air supply pipe (63) rotate, they are both supported by the hollow cone (65) for rotation. During the rotation of the fourth air supply pipe (64), the plurality of oblique guide plates (66) inside the fourth air supply pipe (64) can be driven to rotate rapidly and synchronously, so that The liquid entering the fourth gas pipeline (64) from the liquid-gas mixing pipe (9) can be transported forward by adhering closely to the inner wall of the fourth gas pipeline (64) under the action of centrifugal force and under the guidance of the oblique guide plate (66), while the gas mainly flows at the center of the fourth gas pipeline (64). At this time, after the induced draft fan (5) is started, the suction force causes the gas inside the fourth gas pipeline (64) to enter the second gas pipeline (62) through the third gas pipeline (63), and finally be discharged into the first gas pipeline (61) through the gas outlet of the induced draft fan (5) for transportation; Step 4: The liquid ejected from the right end of the fourth gas pipeline (64) will fall into the outer chamber (7), and a very small portion of the liquid will enter the third gas pipeline (63). However, under the action of the guide cavity (631) provided inside the third gas pipeline (63), the liquid will flow back into the outer chamber (7). Some of the liquid will also be ejected to the outside of the hollow cone (65) sleeved on the outer wall of the third gas pipeline (63). After being blocked by the hollow cone (65), the liquid will flow back into the outer chamber (7) through the annular groove (632). Finally, the liquid will be collected through the confluence groove (71) and discharged into the liquid storage tank (1) through the guide assembly (4) for storage. Part of the overflowing gas will be blocked by the hollow cone (65) and the suction force generated inside the third gas pipeline (63), and will be sent into the third gas pipeline (63) for transportation. Step 5: Some of the gas dissolved in the coal seam water will enter the interior of the liquid storage tank (1) along the inclined conduit (43) and the flow guide pipe (41). Of course, a small amount of gas that overflows from the port of the fourth gas pipeline (64) but does not enter the interior of the third gas pipeline (63) will also enter the interior of the liquid storage tank (1) through the inclined conduit (43) and the flow guide pipe (41). In this process, the coal seam water containing dissolved gas will first collide with the filter screen (83), which can not only filter the impurities in the coal seam water and then roll them into the dirt collecting box (81) for collection, but also collide with the gas in the liquid to overflow, so that the gas can be sucked through the third gas pipeline (63); Step 6: The coal seam water entering the guide pipe (41) will be accelerated by the Tesla valve pipe (42) so that it can rush out quickly through the port of the guide pipe (41). The liquid is collected at the bottom of the liquid storage tank (1) under the effect of gravity, while the gas floats to the upper space inside the liquid storage tank (1). At this time, the suction force inside the second gas pipeline (62) acts on the upper port of the gas collection pipe (32), so that the gas floating on the upper side of the liquid storage tank (1) can be transported to the inside of the second gas pipeline (62) through the gas collection pipe (32), and the water vapor can be condensed and dropped well by the wire mesh column (33) arranged on the inner side of the gas collection pipe (32).

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