Coal matrix filtering, discharging and mining device for deep coal bed gas

Abstract

The coal matrix filtering, discharging and mining device for the deep coal bed gas comprises a top shell base arranged on the input port side of a discharging and mining pipe in a sleeving mode, and the outer wall of the top shell base is sleeved with a blocking and retaining ring bag; a filtering mechanism is mounted at the lower end of the top shell seat; an output port of the filtering mechanism is communicated with a drainage pipe; and a cleaning mechanism for cleaning the filtering mechanism is arranged below the filtering mechanism. Through the arrangement of the blocking retention ring bag, the sealing performance in the drainage and mining operation is conveniently guaranteed; through the design of the filtering mechanism, the filtering of fluid has the characteristic of distinct layers, so that the effective filtering performance of a filtering arc sheet is fully utilized, and the filtering quality is improved; through the structural design of the lifting brush piece, the arc-shaped filter disc cleaning device has good cleaning efficiency and cleaning effect on the arc-shaped filter disc; through the structural arrangement of the flushing assembly, the lifting brush piece can be flushed in time, so that it is guaranteed that the arc-shaped filter disc can be continuously and cleanly flushed by the lifting brush piece in real time, and then the drainage and mining efficiency and quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane mining, and in particular to a coal matrix filtering and drainage device for deep coalbed methane. Background Art

[0002] At present, as an important clean energy resource, the mining and utilization of coalbed methane is increasing worldwide. However, in the process of coalbed methane mining, there is also a large amount of mixture of coal powder and solid particles along with the output of gas. These solid particles not only have a negative impact on the quality and utilization of the gas, but also cause problems such as equipment blockage, wear and environmental pollution. At the same time, there are also problems such as cumbersome cleaning and low efficiency. Therefore, it is of great practical significance to develop a coal matrix filtering and drainage device for deep coalbed methane. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a coal matrix filtering and drainage device for deep coalbed methane.

[0004] The present invention is achieved by adopting the following technical solutions.

[0005] A coal matrix filtering and drainage device for deep coalbed methane comprises a top shell seat sleeved on the input port side of a drainage pipe, with a sealing and retaining ring bag sleeved on the outer wall of the top shell seat; a filtering mechanism is installed at the lower end of the top shell seat, and the output port of the filtering mechanism is connected to the drainage pipe; a cleaning mechanism for cleaning the filtering mechanism is provided below the filtering mechanism.

[0006] Furthermore, the blocking and retaining ring bag is connected to a pressure-controlled pump, and the pressure-controlled pump is arranged in the top shell seat.

[0007] Furthermore, the filtering mechanism includes a motor 1 arranged in the top shell seat, the output end of the motor 1 is connected to a spur gear, and the spur gear is meshed with a spur gear ring rotatably assembled on the top shell seat; the lower end of the spur gear ring is connected to a chassis, and the chassis is downwardly connected to a plurality of partitions, and a filtering sub-chamber is formed between two adjacent partitions, and each filtering sub-chamber is provided with a plurality of arc-shaped filter discs, and a plurality of arc-shaped filter discs on one side of the filtering sub-chamber close to the axis center surround and form a collecting chamber connected to the drainage pipe.

[0008] Furthermore, several arc-shaped filter discs in each filtering sub-chamber are arranged with different radii and the same curvature, and several arc-shaped filter discs are arranged at a certain distance and coaxially with the production and drainage pipe; the filtering diameter of the filter arc discs distributed from the outside to the inside in each filtering sub-chamber decreases layer by layer.

[0009] Furthermore, a stress monitor fixed on the column box is provided in the collecting chamber, the stress monitor is arranged corresponding to the filtering sub-chamber, and the upper end of the stress monitor is connected to a vertically arranged elastic steel sheet.

[0010] Furthermore, the cleaning structure includes a column frame that is sleeved outside the filtering mechanism and connected to the top shell seat, the lower end of the column frame is connected to a column box, and a fan-shaped opening is opened on the top wall of the column box; a column cylinder is provided in the middle of the top wall of the column box, and a second motor is installed at the lower end of the column cylinder, and the lower output end of the second motor is connected to a radially extending rotary support plate, and a lifting brush is provided on the rotary support plate for cleaning the arc filter disc in the filter chamber.

[0011] Furthermore, the lifting brush includes a plurality of cleaning brushes, which are arranged corresponding to a plurality of arc-shaped filter discs in the filter sub-chambers; a telescope 1 and two telescope 2s fixed on a rotating support plate are provided below the cleaning brush, the telescope 1 is located between the two telescopes 2, the two telescopes 2 are respectively connected to the innermost and outermost cleaning brushes, and the telescope 1 is connected to the cleaning brush located in the middle.

[0012] Furthermore, the cleaning brush sheet includes brush strips arranged on the outer arc surface and the inner arc surface of the cleaning brush sheet body, and a material gathering square cavity is vertically formed in the center of the cleaning brush sheet body. A plurality of material gathering square holes that are inclined upward and connect the material gathering square cavity and the brush strips are provided on the cleaning brush sheet body on both sides of the material gathering square cavity; an inlet is formed at the upper end of the material gathering square cavity.

[0013] Furthermore, a supporting piece is provided in the material gathering square cavity, and the supporting piece is arranged at the upper edge of the material gathering square hole, and a slit is formed between the corresponding supporting pieces on both sides.

[0014] Furthermore, the cleaning structure also includes a flushing component, which includes a connecting disk box connected to the top wall of the column box, the lower end surface of the connecting disk box is connected and is provided with a plurality of jet arc covers corresponding to the cleaning brush pieces, and the jet arc covers are provided with flushing ports corresponding to the inlet ports; the connecting disk box is also connected to the inlet pipe, and the inlet pipe is provided with a flow control pump; the flushing component also includes a gathering tray arranged at the bottom of the column box, and the gathering tray is connected to the extraction pipe.

[0015] This application has the following beneficial effects.

[0016] The present invention ensures the sealing during the drainage operation by setting a sealing retaining ring bag; the filtering mechanism is designed to make the filtration of the fluid more distinctive, so as to make full use of the effective filtering performance of the filter arc and improve the filtering quality; the structural design of the lifting brush piece has better cleaning efficiency and cleaning effect for the arc filter piece; the structural setting of the flushing component allows the lifting brush piece to be flushed in time, thereby ensuring that the arc filter piece can be continuously and real-time cleaned by the lifting brush piece, thereby improving the drainage efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the filtering mechanism of the present invention;

[0019] Figure 3 The partial cross-sectional structure of the present invention is schematically shown Figure 1 ;

[0020] Figure 4 This is a partial cross-sectional view of the present invention. Figure 2 ;

[0021] Figure 5 is a vertical cross-sectional view of the cleaning brush sheet of the present invention;

[0022] Figure 6 It is a schematic diagram intended to embody the internal structure of the manifold chamber of the present invention.

[0023] Among them, 1. top shell seat; 2. sealing and retaining ring capsule; 3. pressure control pump; 4. drainage pipe; 5. filtering mechanism; 51. spur ring; 52. spur gear; 53. motor 1; 54. partition; 55. arc filter; 56. collecting chamber; 57. chassis; 571. mounting hole; 6. cleaning mechanism; 61. column frame; 62. column box; 621. fan-shaped mouth; 63. column tube; 64. motor 2; 65. rotating support plate; 66. lifting brush; 661. telescopic Device 1; 662, telescopic device 2; 663, cleaning brush; 6631, brush strip; 6632, gathering square hole; 6633, gathering square cavity; 6634, supporting piece; 6635, slit; 6636, inlet; 67, flushing assembly; 671, connecting plate box; 672, jet arc cover; 673, jet port; 674, inlet pipe; 675, flow control pump; 68, gathering tray; 69, suction pipe; 7, stress monitor; 8, elastic steel sheet. DETAILED DESCRIPTION

[0024] The present patent application is further described below in conjunction with embodiments.

[0025] like Figure 1-6 As shown, a coal matrix filtering and drainage device for deep coalbed methane comprises:

[0026] The top shell seat 1 is sleeved on the input port side of the drainage pipe 4, and the outer portion of the top shell seat 1 is sleeved with a sealing and retaining ring bag 2 for sealing and retaining with the wellbore wall of the drainage wellbore;

[0027] A filter mechanism 5 is installed at the lower end of the top shell seat 1, and the output port of the filter mechanism 5 is connected to the drainage pipe 4;

[0028] A column frame 61 is sleeved outside the filter mechanism 5 and connected to fix the top shell seat 1, and a cleaning mechanism 6 for cleaning the filter mechanism 5 is installed at the lower end of the column frame 61.

[0029] Among them, the sealing and retaining ring bag 2 is connected to a pressure-controlling pump 3 for regulating the internal air pressure. The pressure-controlling pump 3 is installed inside the top shell seat 1 so as to regulate the pressure of the sealing and retaining ring bag 2 according to the changes in the borehole pressure of the drainage wellbore at different depths, so as to make the sealing and retention between the sealing and retaining ring bag 2 and the well wall safer.

[0030] Wherein, the filtering mechanism 5 comprises:

[0031] A motor 53 is fixed in the top housing 1, and a spur gear 52 is fixed at its output end;

[0032] A spur gear ring 51 is rotatably assembled with the top shell seat 1 and meshed with the spur gear 52. A chassis 57 is fixed at the lower end of the spur gear ring 51. The chassis 57 is provided with mounting holes 571 evenly distributed along the circumference. The mounting holes 571 are connected to the downward-pointing partitions 54. A filtering sub-chamber is formed between adjacent partitions 54. An arc filter 55 covering the filtering sub-chamber is connected between adjacent partitions 54. Multiple arc filter discs 55 in each filtering sub-chamber are arranged in a manner of different radii and the same arc. Multiple arc filter discs 55 are spaced at a certain distance and arranged coaxially with the drainage pipe 4. The arc filter discs 55 located on the side of the axis of the multiple filtering sub-chambers surround and form a collecting chamber 56 corresponding to the drainage pipe 4. All the fluid outside the drainage wellbore will pass through the outer diameter side of the filter mechanism 5 to the inner diameter side layer by layer to filter and enter the collecting chamber 56, so as to fully filter the fluid in the drainage process.

[0033] Among them, the filter diameter of the filter arc piece 55 distributed from the outer diameter to the inner diameter in each of the filtering sub-chambers decreases layer by layer, so that the filtration of the fluid has more distinct layered characteristics, so as to fully utilize the effective filtering performance of the filter arc piece 55 and improve the filtering quality.

[0034] Wherein, the cleaning structure 6 comprises:

[0035] A column box 62 is connected and fixed to the lower end of the column frame 61, and a fan-shaped opening 621 is opened at the upper end of the column box 62, and the fan-shaped opening 621 corresponds to the axial coverage surface of one of the filtering sub-chambers. A column barrel 63 is fixed at the top center of the column box 62, and a motor 2 64 is installed at the lower end of the column barrel 63. A radially pointing rotary support plate 65 is fixed at the lower output end of the motor 2 64, and a lifting brush plate 66 is installed on the rotary support plate 65 for cleaning multiple arc-shaped filter plates 55 in one of the filtering sub-chambers at a time;

[0036] A flushing assembly 67 installed at the top end surface of the column box 62 is used to flush and clean the lifting brush piece 66;

[0037] By regulating the position of the rotating filter chamber through motor 1 53, the arc filter 55 in the filter chamber to be cleaned is located directly above the fan-shaped opening 621, and at this time the partition 54 is just vertically attached to the radial two side bevels in the fan-shaped opening 621, forming a lateral interception structure, so that the arc filter 55 can be cleaned independently, and isolated from the remaining filter chambers to avoid affecting the filtering operation of the remaining filter chambers; through the setting of the flushing component 67, and then under the regulation of motor 2 64, when the lifting brush 66 is adjusted to the bottom of the flushing component 67, the lifting brush 66 can be effectively flushed, and the coal powder on the lifting brush 66 can be removed in time to ensure the cleaning effect of the lifting brush 66, and the flushing component 67 can operate sustainably and efficiently to clean the arc filter 55 and the lifting brush 66.

[0038] Wherein, the lifting brush piece 66 comprises:

[0039] The cleaning brush 663 is arranged corresponding to the plurality of arc-shaped filter discs 55 in one of the filtering sub-chambers, and one cleaning brush 663 can correspond to the distance between two adjacent arc-shaped filter discs 55;

[0040] The first retractor 661 and the second retractor 662 are fixed on the rotating support plate 65, and the second retractor 662 is provided in two groups and distributed at the inner side and the outer side of the rotating support plate 65, and is used to regulate the lifting and lowering movement of the cleaning brush piece 663 on the inner side and the lifting and lowering movement of the cleaning brush piece 663 on the outer side respectively. The first retractor 661 is provided in the middle of the rotating support plate 65, and is used to regulate the synchronous lifting and lowering movement of the remaining cleaning brush pieces 663;

[0041] Among them, the number of cleaning brushes 663 is one more than the number of arc-shaped filter discs 55, that is, when the cleaning brushes 663 move upward, there is a cleaning brush 663 on the outer side of the outermost arc-shaped filter disc 55 and the inner side of the innermost arc-shaped filter disc 55, so that the arc-shaped filter disc 55 can be fully wrapped and fully cleaned. Preferably, the inner arc surface of the innermost cleaning brush disc 663 is a non-air-permeable surface structure to ensure that it forms a sealing structure with the partition plate 54, so as to avoid the fluid from flowing into the collecting chamber 56 when cleaning the arc-shaped filter disc 55 in the filtering sub-chamber, thereby ensuring the drainage quality;

[0042] Among them, in the process of cleaning the arc filter 55 by the cleaning brush 663, after the telescoping device 1 661 and the telescoping device 2 662 adjust the cleaning brush 663 to cooperate with the arc filter 55, the telescoping device 1 661 adjusts the corresponding cleaning brush 663 above it to reciprocately clean the arc filter 55.

[0043] Among them, brush strips 6631 are respectively arranged on the outer arc surface and the inner arc surface of the cleaning brush sheet 663, and a vertical material gathering square cavity 6633 is provided in the center of the cleaning brush sheet 663. Material gathering square holes 6632 are respectively arranged on both sides of the material gathering square cavity 6633 in an upward inclined direction and connecting the material gathering square cavity 6633 and a side area of ​​the brush strip 6631, and the material gathering square holes 6632 are arranged at intervals in the vertical direction, and the upper end of the material gathering square cavity 6633 is connected to an inlet 6636. By vertically arranging the material-gathering square hole 6632, when the brush bar 6631 is in the process of cleaning the coal powder on the arc filter 55, it can effectively and timely collect and guide the coal powder. That is, when the cleaned coal powder flows off, the coal powder falling into the material-gathering square hole 6632 is not easy to fall back onto the arc filter 55 and the brush bar 6631 again, but is intercepted by the material-gathering square hole 6632, which shortens the distance of the coal powder from escaping and flowing outward, thereby reducing the frequency of coal powder crossflow, thereby improving the cleaning efficiency and quality. The design of the material gathering square cavity 6633 can assist in expanding the capacity of the material gathering square hole 6632, and when flushing the cleaning brush 663, the injection port 673 is aligned with the flow inlet 6636. At this time, under the action of the flow control pump 675, cleaning liquid can be introduced into the flow inlet 6636 for high-pressure injection, thereby flushing and cleaning the material gathering square cavity 6633 and the material gathering square hole 6632.

[0044] The said square cavity 6633 is also provided with a supporting sheet 6634 which is arranged and distributed corresponding to the square hole 6632 and has a thin structure, and the supporting sheet 6634 is arranged close to one side of the upper end surface of the square hole 6632, and a slit 6635 is reserved between the two sides corresponding to the said supporting sheet 6634. Under the action of the supporting sheet 6634, the tendency of the coal powder flowing into the square cavity 6633 to always flow down and accumulate is avoided, and the coal powder entering the square hole 6632 of each layer can be blocked, so as to make full use of the capacity of the square cavity 6633 and prevent the coal powder from flowing out of the square cavity 6633 below. The setting of the slit 6635 also ensures that the square cavity 6633 can be fully flushed.

[0045] Wherein, the flushing assembly 67 comprises:

[0046] A connecting disk box 671 is fixedly connected to the column box 62, and the lower end surface of the connecting disk box 671 is connected and arranged with a plurality of jet arc covers 672 corresponding to the cleaning brush pieces 663, and the lower end of the jet arc cover 672 is provided with a jet port 673 corresponding to the inlet port 6636;

[0047] An inlet pipe 674 is arranged to penetrate the top shell seat 1 and the column box 62 and communicate with the connecting disk box 671, and a flow control pump 675 is installed on the inlet pipe 674;

[0048] A gathering tray 68 is arranged at the bottom of the column box 62 , and the gathering tray 68 is connected to a suction pipe 69 which is arranged to pass through the column box 62 and the top shell seat 1 .

[0049] Among them, the said collecting chamber 56 is provided with a stress monitor 7 fixed on the outside of the upper end of the column box 62, the stress monitor 7 is arranged corresponding to the filtering sub-chamber, and the upper end of the stress monitor 7 is connected with a vertical elastic steel sheet 8, and the said stress monitor 7 is used to monitor the bending stress of the elastic steel sheet 8. By monitoring the bending stress of the elastic steel sheet 8 in real time through the stress monitor 7, the bending degree of the elastic steel sheet 8 can be judged, and the air permeability of the fluid flowing from the outer diameter side to the inner diameter side on each filtering sub-chamber can be understood and obtained, so as to judge the degree of filtering and gathering coal powder on the arc filter 55, that is, the smaller the bending stress of the elastic steel sheet 8, the more coal powder is gathered on the arc filter 55, so that the filtering sub-chamber that needs to be cleaned and the arc filter 55 inside it can be known.

[0050] During specific implementation, the device of the present invention is lowered along with the drainage pipe 4 to the required drainage position in the wellbore, and the air pressure of the sealing retaining ring bag 2 is regulated by the air compressor 3 to ensure that it is sealed and retained with the wellbore wall, so that the drainage operation can be carried out, and the stress threshold of the stress monitor 7 is set. When the change in the stress value reaches the stress threshold, the corresponding filter chamber is regulated by the motor 53 to rotate to above the corresponding area of ​​the fan-shaped opening 621, and the lifting brush 66 in the cleaning mechanism 6 is started to clean the arc filter 55. After the arc filter 55 is cleaned, the flushing component 67 is used to clean the lifting brush 66 so as to wait for the next use.

[0051] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal matrix filtering and drainage device for deep coalbed methane, characterized by: The invention comprises a top shell seat (1) sleeved on the input port side of a drainage pipe (4), wherein a sealing and retaining ring bag (2) is sleeved on the outer wall of the top shell seat (1); a filter mechanism (5) is installed at the lower end of the top shell seat (1), and the output port of the filter mechanism (5) is connected to the drainage pipe (4); and a cleaning mechanism (6) for cleaning the filter mechanism (5) is provided below the filter mechanism (5).

2. A coal matrix filtering and drainage device for deep coalbed methane according to claim 1, characterized in that: The blocking and retaining annular bag (2) is connected to a pressure control pump (3), and the pressure control pump (3) is arranged in the top shell seat (1).

3. A coal matrix filtering and drainage device for deep coalbed methane according to claim 1, characterized in that: The filtering mechanism (5) comprises a motor (53) arranged in the top shell seat (1), the output end of the motor (53) is connected to a spur gear (52), and the spur gear (52) meshes with a spur gear ring (51) rotatably assembled on the top shell seat (1); the lower end of the spur gear ring (51) is connected to a bottom plate (57), and the bottom plate (57) is downwardly connected to a plurality of partitions (54), and a filtering sub-chamber is formed between two adjacent partitions (54), and each filtering sub-chamber is provided with a plurality of arc-shaped filter discs (55), and the plurality of arc-shaped filter discs (55) on one side of the filtering sub-chamber close to the axis surround and form a collecting chamber (56) connected to the drainage pipe (4).

4. A coal matrix filtering and drainage device for deep coalbed methane according to claim 3, characterized in that: The plurality of arc-shaped filter plates (55) in each filtering sub-chamber are arranged in a manner of different radii and the same curvature, and the plurality of arc-shaped filter plates (55) are arranged at a certain distance and arranged coaxially with the drainage pipe (4); the filtering diameters of the filter arc plates (55) distributed from the outside to the inside in each filtering sub-chamber decrease layer by layer.

5. The coal matrix filtering and drainage device for deep coalbed methane according to claim 3 is characterized by: The collecting chamber (56) is provided with a stress monitor (7) fixed on the column box (62). The stress monitor (7) is arranged corresponding to the filtering chamber, and the upper end of the stress monitor (7) is connected to a vertically arranged elastic steel sheet (8).

6. The coal matrix filtering and drainage device for deep coalbed methane according to claim 1, characterized in that: The cleaning structure (6) comprises a column frame (61) which is sleeved outside the filtering mechanism (5) and connected to the top shell seat (1); the lower end of the column frame (61) is connected to a column box (62); the top wall of the column box (62) is provided with a fan-shaped opening (621); a column cylinder (63) is provided in the middle of the top wall of the column box (62); a second motor (64) is installed at the lower end of the column cylinder (63); the lower output end of the second motor (64) is connected to a radially extending rotary support plate (65); the rotary support plate (65) is provided with a lifting brush plate (66) for cleaning the arc filter plate (55) in the filter chamber.

7. A coal matrix filtering and drainage device for deep coalbed methane according to claim 6, characterized in that: The lifting brush (66) comprises a plurality of cleaning brushes (663), and the cleaning brushes (663) are arranged corresponding to the plurality of arc-shaped filter plates (55) in the filter sub-chambers; a retractor 1 (661) and two retractors 2 (662) fixed on the rotating support plate (65) are arranged below the cleaning brush (663); the retractor 1 (661) is located between the two retractors 2 (662); the two retractors 2 (662) are respectively connected to the innermost and outermost cleaning brushes (663); and the retractor 1 (661) is connected to the cleaning brush (663) located in the middle.

8. A coal matrix filtering and drainage device for deep coalbed methane according to claim 7, characterized in that: The cleaning brush sheet (663) comprises brush strips (6631) arranged on the outer arc surface and the inner arc surface of the cleaning brush sheet body, a material gathering square cavity (6633) is vertically formed in the center of the cleaning brush sheet body, and a plurality of material gathering square holes (6632) inclined upward and connecting the material gathering square cavity (6633) and the brush strips (6631) are arranged on the cleaning brush sheet body on both sides of the material gathering square cavity (6633); an inlet (6636) is formed at the upper end of the material gathering square cavity (6633).

9. A coal matrix filtering and drainage device for deep coalbed methane according to claim 8, characterized in that: A supporting piece (6634) is also provided in the material gathering square cavity (6633). The supporting piece (6634) is arranged at the upper edge of the material gathering square hole (6632), and a slit (6635) is formed between the supporting pieces (6634) corresponding to the two sides.

10. A coal matrix filtering and drainage device for deep coalbed methane according to claim 6, characterized in that: The cleaning structure (6) further comprises a flushing assembly (67), wherein the flushing assembly (67) comprises a connecting disk box (671) connected to the top wall of the column box (62), the lower end surface of the connecting disk box (671) is connected to and provided with a plurality of jet arc covers (672) corresponding to the cleaning brush sheets (663), and the jet arc covers (672) are provided with flushing ports (673) corresponding to the inlet ports (6636); the connecting disk box (671) is also connected to an inlet pipe (674), and a flow control pump (675) is provided on the inlet pipe (674); the flushing assembly (67) further comprises a gathering tray (68) arranged at the bottom of the column box (62), and the gathering tray (68) is connected to the extraction pipe (69).

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