A high-efficiency energy-saving gas extraction system, method and device

Abstract

The application discloses a kind of high-efficiency energy-saving type gas extraction system, method and equipment, comprising: dynamic extraction device, selective extraction at different drilling depths is realized;Derrick is used to support and accurately position dynamic extraction device;Lifting module is installed on derrick, and dynamic extraction device can be driven to move along the direction of drilling depth;Variable frequency extraction pump group is connected with lifting extraction pipe, and is used to generate negative pressure to extract gas;Real-time monitoring module detects gas concentration, flow and system energy consumption parameters;Intelligent control unit dynamically adjusts extraction depth, extraction range and pump group power according to monitoring data;Compared with prior art, the application optimizes energy distribution, strengthens extraction efficiency with structural innovation, solves the pain points of high energy consumption, poor adaptability and easy blockage, and provides core technical support for coal mine safety and green mining.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas extraction, in particular to an efficient and energy-saving gas extraction system, method and equipment. BACKGROUND

[0002] In coal mine gas extraction, the underground coal seam gas distribution presents significant heterogeneity, and the enrichment area is discrete and dynamically migrates, so realizing accurate extraction of the horizon becomes the key to improving efficiency and safety. The existing technology mainly relies on three types: one is a mobile fixed-point extraction device, which seals the target horizon through mechanical struts or air bags, but the negative pressure leaks due to poor wall adhesion, and the extraction range is fixed and difficult to adapt to the change of the coal seam; two is a segmented fixed sealing system, which extracts by pre-setting packers, but the position is not adjustable and cannot respond to the migration of the gas enrichment area; three is a constant power pump group for full well section extraction, which continuously consumes high energy but is ineffective for low concentration areas. These methods generally have the defects of poor sealing reliability, rigid extraction range and serious energy waste, which restricts the extraction efficiency.

[0003] Therefore, it is necessary to provide an efficient and energy-saving gas extraction system, method and equipment to solve the problems raised in the background technology. SUMMARY

[0004] To achieve the above purpose, the present application provides the following technical scheme: an efficient and energy-saving gas extraction system, comprising:

[0005] A dynamic extraction device for selective extraction at different drilling depths;

[0006] A derrick for supporting and accurately positioning the dynamic extraction device;

[0007] A lifting module installed on the derrick, which can drive the dynamic extraction device to move along the drilling depth direction;

[0008] A variable frequency extraction pump group connected to the lifting extraction pipe for generating negative pressure to extract gas;

[0009] A real-time monitoring module for detecting gas concentration, flow and system energy consumption parameters;

[0010] An intelligent control unit for dynamically adjusting the extraction depth, extraction range and pump group power according to the monitoring data.

[0011] Further, the dynamic extraction device comprises an extraction pipe, a circle of air inlet holes is formed in the side wall of the lower part of the extraction pipe, an upper sleeve and a lower sleeve are respectively sleeved on the outer wall of the extraction pipe above and below the air inlet holes, and the upper sleeve and the lower sleeve are symmetrically arranged;

[0012] A plurality of support plates are distributed on the outer walls of the upper sleeve and the lower sleeve, and a sealing ring is distributed at the end of the upper sleeve and the lower sleeve away from the air inlet hole.

[0013] Further, the upper sleeve or the lower sleeve is hinged to the corresponding support plate through a plurality of first connecting rods parallel to each other, and the upper sleeve and the lower sleeve are slidably sleeved with a sliding ring between the corresponding support plate and the sealing ring, and the sliding ring is hinged to the corresponding support plate through a second connecting rod.

[0014] The outer wall of the upper sleeve and the lower sleeve is fixed with a telescopic cylinder, and the piston shaft of the telescopic cylinder is connected to the corresponding sliding ring.

[0015] Further, the upper sleeve and the lower sleeve are fixed with a support ring on the side of the corresponding sealing ring close to the air inlet hole, a plurality of arc-shaped through grooves are formed in the support ring, a wedge is slidably penetrated into each groove, the wedge is thinned towards the air inlet hole, and the wedge is attached to the inner wall of the corresponding sealing ring.

[0016] Further, a plurality of support bars are circumferentially distributed around the support ring and can slide in the radial direction, and the inner wall of the support bar is attached to the corresponding wedge.

[0017] Further, each wedge is fixed to the corresponding sliding ring.

[0018] Further, the upper sleeve and the lower sleeve are slidably connected with the extraction pipe, the bottom of the extraction pipe is fixed with a bottom plate, and the outer wall of the extraction pipe above the air inlet hole is fixed with a stop block.

[0019] Further, a side groove is formed in the side wall of the extraction pipe corresponding to the position of the lower sleeve, a sliding block is slidably arranged in the extraction pipe, the sliding block is fixed to the inner wall of the lower sleeve through the side groove, a connecting rod is arranged in the center of the sliding block, a scraper is fixed to the upper end of the connecting rod, and the scraper is attached to the inner wall of the extraction pipe.

[0020] Further, the connecting rod is rotatably connected with the sliding block, a nut is fixed to the inner wall of the extraction pipe below the side groove, a thread is formed in the outer wall of the connecting rod, and the connecting rod is threadedly connected with the nut.

[0021] An efficient and energy-saving gas extraction method, comprising:

[0022] S1, collecting the gas concentration, flow and system energy consumption parameters in the well through a real-time monitoring module;

[0023] S2, the intelligent control unit dynamically analyzes the parameters and generates instructions:

[0024] sending a depth adjustment signal to the lifting module to drive the dynamic extraction device to move to the target coal seam;

[0025] sending a power instruction to the variable frequency extraction pump group to adjust the extraction negative pressure strength;

[0026] S3, execute operation at target depth:

[0027] The telescopic cylinder drives the slip ring of the upper sleeve, so that the support plate is radially expanded and clamped to the well wall, and the wedge is pushed to radially expand the sealing ring and press the well wall;

[0028] S4, dynamically adjust the length of the closed interval by lifting the extraction pipe:

[0029] After the moving extraction pipe changes the distance between the upper sleeve and the lower sleeve, the lower sleeve correspondingly presses the support plate and the sealing ring to the well wall;

[0030] S5, execute self-cleaning of the air inlet hole:

[0031] When the lower sleeve is fixed, the lifting extraction pipe drives the connecting rod to move axially;

[0032] The connecting rod is engaged with the fixed nut by large lead screw and rotates to drive the scraper to scrape the inner wall of the extraction pipe to remove the coal ash.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] In the present application, through the deep cooperation of intelligent control and mechanical innovation, the efficiency and energy saving in the field of gas extraction are realized, and the system relies on the real-time monitoring module to dynamically perceive the downhole working condition, and the intelligent control unit generates double instructions: on the one hand, the lifting module is accurately driven to position to the gas enrichment layer, and on the other hand, the power of the variable frequency pump set is adjusted as needed, which significantly reduces the invalid energy consumption.

[0035] In the present application, the dynamic extraction device innovatively adopts a linkage mechanism: the radial expansion of the support plate and the wedge tightening of the sealing ring can be completed synchronously in a single action, a high sealing closed extraction interval is quickly formed on the well wall, negative pressure leakage is eliminated, and the gas concentration is greatly improved;

[0036] In the present application, the extraction range can be flexibly stretched according to the change of the coal seam, and is suitable for complex geological conditions; and through the self-cleaning design, the lifting movement of the extraction pipe is converted into rotary scraping by mechanical transmission, and the coal ash in the air inlet hole is automatically removed, so that long-term efficient operation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a high-efficiency energy-saving gas extraction system;

[0038] Figure 2 It is a structural schematic diagram of a dynamic extraction device;

[0039] Figure 3 It is a structural schematic diagram of the upper sleeve;

[0040] Figure 4 It is a structural schematic diagram of the sealing ring;

[0041] Figure 5 is a structural diagram of the inside of the lower sleeve and the extraction pipe;

[0042] In the figure: 1, extraction pipe; 201, upper sleeve; 202, lower sleeve; 203, side groove; 204, sliding block; 205, connecting rod; 206, scraper; 207, nut; 21, support plate; 22, first connecting rod; 23, sliding ring; 24, second connecting rod; 25, clamping strip; 3, sealing ring; 31, support ring; 32, support strip; 33, wedge block; 34, through groove; 35, limiting block; 4, bottom plate; 5, air inlet hole; 6, telescopic cylinder; 7, stop block. DETAILED DESCRIPTION

[0043] Please refer to Figures 1-5 In the embodiment of the present application, an efficient and energy-saving gas extraction system comprises:

[0044] A dynamic extraction device is used to achieve selective extraction at different drilling depths.

[0045] A derrick is used to support and accurately position the dynamic extraction device.

[0046] A lifting module is installed on the derrick and can drive the dynamic extraction device to move along the drilling depth direction.

[0047] A variable frequency extraction pump group is connected to the lifting extraction pipe and is used to generate negative pressure to extract gas.

[0048] A real-time monitoring module is used to detect gas concentration, flow rate, and system energy consumption parameters.

[0049] An intelligent control unit dynamically adjusts the extraction depth, extraction range, and pump group power according to the monitoring data.

[0050] The system continuously collects gas concentration, flow rate, and energy consumption data through the real-time monitoring module and transmits them to the intelligent control unit for dynamic analysis. The control unit generates double instructions according to the monitoring results: on the one hand, it sends depth / range adjustment signals to the lifting module to drive the dynamic extraction device to accurately position the target coal seam on the derrick, and on the other hand, it outputs power instructions to the variable frequency extraction pump group to implement selective extraction through the negative pressure pipeline. After the extracted gas is collected into the collection system, the new working condition data is fed back to the monitoring module in real time, realizing the self-adaptive matching of the extraction depth, range, and extraction power, and ultimately achieving the dual goals of efficient extraction and energy saving.

[0051] In the embodiment, the dynamic extraction device comprises an extraction pipe 1, a circle of air inlet holes 5 is formed in the side wall of the lower part of the extraction pipe 1, upper and lower outer walls of the extraction pipe 1 are respectively sleeved with an upper sleeve 201 and a lower sleeve 202, and the upper sleeve 201 and the lower sleeve 202 are symmetrically arranged.

[0052] The outer wall of the upper sleeve 201 and the lower sleeve 202 is provided with a plurality of support plates 21, and the end of the upper sleeve 201 and the lower sleeve 202 away from the air inlet hole 5 is provided with a sealing ring 3.

[0053] When the support plates 21 of the two upper sleeves 201 and the lower sleeves 202 are supported on the well wall of the gas-rich section, the boreholes above and below the air inlet hole 5 are sealed by the sealing rings 3, so that the negative pressure generated by the extraction pump only acts on the boreholes within the range between the two sealing rings 3, thereby improving the extraction efficiency.

[0054] In this embodiment, the upper sleeve 201 or the lower sleeve 202 is hinged to the corresponding support plate 21 through a plurality of first connecting rods 22 parallel to each other, and the upper sleeve 201 and the lower sleeve 202 are slidingly sleeved with a sliding ring 23 at the position between the corresponding support plate 21 and the sealing ring 3, and the sliding ring 23 is hinged with a second connecting rod 24 between the corresponding support plate 21.

[0055] That is, by sliding the sliding ring 23 towards the air inlet hole 5, the support plate 21 can be expanded to support the well wall of the borehole with different diameters.

[0056] In this embodiment, the outer wall of the upper sleeve 201 and the lower sleeve 202 is fixed with a telescopic cylinder 6, and the piston shaft of the telescopic cylinder 6 is connected to the corresponding sliding ring 23.

[0057] That is, the corresponding sliding ring 23 can be driven to slide by the telescopic cylinder 6.

[0058] In this embodiment, the upper sleeve 201 and the lower sleeve 202 are fixed with a support ring 31 on the side of the corresponding sealing ring 3 close to the air inlet hole 5, a plurality of arc-shaped through grooves 34 are formed in the support ring 31, a wedge block 33 is slidingly penetrated in each groove 34, the wedge block 33 is thinned towards the air inlet hole 5, and the wedge block 33 is fitted to the inner wall of the corresponding sealing ring 3.

[0059] By sliding the wedge block 33, the thicker part in the sealing ring 3 can be expanded to support the sealing ring 3, thereby being fitted to the well wall to seal the borehole.

[0060] In this embodiment, a plurality of support bars 32 radially sliding are circumferentially distributed around the support ring 31, and the inner wall of the support bar 32 is fitted to the corresponding wedge block 33.

[0061] That is, when the wedge block 33 expands the sealing ring 3, the support bar 32 will also slide outward, so that the support bar 32 can limit the movement of the sealing ring 3 towards the air inlet hole 5, and when the sealing ring 3 is in the contracted state, the support bar 32 can move inward to avoid being stuck in the well wall.

[0062] In the embodiment, the upper sleeve 201 and the lower sleeve 202 are fixed with a plurality of limiting blocks 35 between the gaps of the wedge blocks 33 on the side of the corresponding sealing ring 3 away from the air inlet hole 5, so as to limit the movement of the sealing ring 3 away from the air inlet hole 5.

[0063] In the embodiment, the vertical clamping strip 25 is fixed to the outer wall of each support plate 21.

[0064] When the support plate 21 is attached to the well wall, the clamping strip 25 can be embedded in the well wall, improving the stability of the support.

[0065] In the embodiment, each wedge block 33 is fixed to the corresponding sliding ring 23.

[0066] That is, when the sliding ring 23 slides towards the air inlet hole 5 to expand the support plate 21, the wedge block 33 also expands the sealing ring 3, so that the upper sleeve 201 or the lower sleeve 202 is fixed to the well wall, and the sealing ring 3 automatically seals the drilling at the position.

[0067] In the embodiment, the upper sleeve 201 and the lower sleeve 202 are both in sliding connection with the extraction pipe 1, and the bottom plate 4 is fixed to the bottom of the extraction pipe 1, and the blocking block 7 is fixed to the outer wall of the extraction pipe 1 above the air inlet hole 5.

[0068] That is, when the support plate 21 is in a contracted state, the upper sleeve 201 is attached to the blocking block 7 under the action of gravity, and when the support plate 21 of the upper sleeve 201 is expanded, the upper sleeve 201 is fixed to the well wall, and by lifting the extraction pipe 1, the relative position of the upper sleeve 201 and the extraction pipe 1 can be changed, so as to change the distance between the upper sleeve 201 and the lower sleeve 202, thereby changing the length of the extraction area.

[0069] In the embodiment, the side slot 203 is arranged in the side wall of the extraction pipe 1 corresponding to the position of the lower sleeve 202, the sliding block 204 is arranged in the extraction pipe 1 in a sliding manner, the sliding block 204 is fixed to the inner wall of the lower sleeve 202 through the side slot 203, the connecting rod 205 is arranged in the center of the sliding block 204, the scraper 206 is fixed to the upper end of the connecting rod 205, and the scraper 206 is attached to the inner wall of the extraction pipe 1.

[0070] When the support plate 21 of the lower sleeve 202 is expanded, the lower sleeve 202 is fixed to the well wall, and at this time, the position of the sliding block 204 is also fixed, and by lifting the extraction pipe 1 in a small amplitude, the scraper 206 can be scraped up and down on the inner wall of the extraction pipe 1, so as to clean the inner wall of the extraction pipe 1 at the air inlet hole 5, and the coal ash at the air inlet hole 5 is scraped off.

[0071] In this embodiment, the connecting rod 205 is rotatably connected with the sliding block 204, the nut 207 is fixedly arranged on the inner wall of the extraction pipe 1 below the side groove 203, the outer wall of the connecting rod 205 is provided with a thread, and the connecting rod 205 is threadedly connected with the nut 207.

[0072] The thread on the outer wall of the nut 207 and the connecting rod 205 is a large lead thread, when the connecting rod 205 slides up and down relative to the nut 207, the connecting rod 205 rotates, so that the scraper 206 rotates when scraping up and down on the inner wall of the extraction pipe 1, thereby improving the cleaning effect.

[0073] An efficient and energy-saving gas extraction method, comprising:

[0074] S1, collecting the gas concentration, flow and system energy consumption parameters in the well by a real-time monitoring module;

[0075] S2, the intelligent control unit dynamically analyzes the parameters and generates instructions:

[0076] sending a depth adjustment signal to the lifting module to drive the dynamic extraction device to move to the target coal seam;

[0077] sending a power instruction to the variable frequency extraction pump group to adjust the extraction negative pressure strength;

[0078] S3, performing linkage operation at the target depth:

[0079] The telescopic cylinder 6 drives the sliding ring 23 of the upper sleeve pipe 201, so that the support plate 21 is radially expanded and clamped to the well wall, and the wedge block 33 is pushed to radially expand the sealing ring 3 to press the well wall;

[0080] S4, dynamically adjusting the length of the closed interval by the lifting extraction pipe 1:

[0081] After moving the extraction pipe 1 to change the distance between the upper sleeve pipe 201 and the lower sleeve pipe 202, the lower sleeve pipe 202 correspondingly presses the support plate 21 and the sealing ring 3 to the well wall;

[0082] S5, performing self-cleaning of the air inlet hole:

[0083] When the lower sleeve pipe 202 is fixed, the lifting extraction pipe 1 drives the connecting rod 205 to move axially;

[0084] The connecting rod 205 is engaged and rotated with the fixed nut 207 through the large lead thread, and drives the scraper 206 to scrape the inner wall of the extraction pipe 1 to remove the coal ash.

[0085] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high-efficiency and energy-saving gas extraction system, characterized in that, include: The dynamic extraction device enables selective extraction at different drilling depths; A derrick is used to support and precisely position a dynamic extraction device. The lifting module, installed on the derrick, can drive the dynamic extraction device to move along the drilling depth direction; The variable frequency extraction pump set is connected to the lifting extraction pipe and is used to generate negative pressure to extract gas. The real-time monitoring module detects gas concentration, flow rate, and system energy consumption parameters; The intelligent control unit dynamically adjusts the extraction depth, extraction range, and pump power based on monitoring data. The dynamic extraction device includes an extraction pipe (1), and an air inlet (5) is provided on the lower side wall of the extraction pipe (1). An upper sleeve (201) and a lower sleeve (202) are respectively fitted on the outer wall of the extraction pipe (1) above and below the air inlet (5). The upper sleeve (201) and the lower sleeve (202) are arranged symmetrically. The outer walls of the upper sleeve (201) and the lower sleeve (202) are each distributed with multiple support plates (21), and the ends of the upper sleeve (201) and the lower sleeve (202) away from the air inlet (5) are each distributed with sealing rings (3); The upper sleeve (201) or lower sleeve (202) is hinged to the corresponding support plate (21) by multiple parallel first connecting rods (22). The upper sleeve (201) and lower sleeve (202) are slidably fitted with slip rings (23) between the corresponding support plate (21) and the sealing ring (3). The slip rings (23) are hinged to the corresponding support plate (21) by a second connecting rod (24). Both the upper sleeve (201) and the lower sleeve (202) are fixed with telescopic cylinders (6), and the piston shaft of the telescopic cylinder (6) is connected to the corresponding slip ring (23); The upper sleeve (201) and the lower sleeve (202) have a support ring (31) fixed on the side of the corresponding sealing ring (3) near the air inlet (5). The support ring (31) has multiple arc-shaped through grooves (34) that run vertically through each other. Each through groove (34) has a wedge (33) that slides through it. The wedge (33) is thinned towards the air inlet (5) and fits against the inner wall of the corresponding sealing ring (3). The upper sleeve (201) and the lower sleeve (202) are slidably connected to the extraction pipe (1), and the bottom of the extraction pipe (1) is fixed with a base plate (4), and a baffle (7) is fixed on the outer wall of the extraction pipe (1) above the air inlet (5). The extraction tube (1) corresponding to the position of the lower sleeve (202) has a side groove (203) that runs through the inside and outside. A slider (204) is slidably arranged inside the extraction tube (1), and the slider (204) is fixed to the inner wall of the lower sleeve (202) through the side groove (203). A connecting rod (205) is arranged at the center of the slider (204), and a scraper (206) is fixed at the upper end of the connecting rod (205). The scraper (206) is attached to the inner wall of the extraction tube (1).

2. The high-efficiency and energy-saving gas extraction system according to claim 1, characterized in that, The support ring (31) is surrounded by a plurality of support strips (32) that can slide radially, and the inner wall of the support strips (32) is attached to the corresponding wedge (33).

3. The high-efficiency and energy-saving gas extraction system according to claim 1, characterized in that, Each of the wedges (33) is fixed to the corresponding slip ring (23).

4. The high-efficiency and energy-saving gas extraction system according to claim 1, characterized in that, The connecting rod (205) is rotatably connected to the slider (204). The inner wall of the extraction pipe (1) below the side groove (203) is fixed with a nut (207). The outer wall of the connecting rod (205) is threaded. The connecting rod (205) is threadedly connected to the nut (207).

5. A highly efficient and energy-saving gas extraction method, employing a highly efficient and energy-saving gas extraction system according to any one of claims 1-4, characterized in that, include: S1. Collect gas concentration, flow rate and system energy consumption parameters in the well through the real-time monitoring module; S2. The intelligent control unit dynamically analyzes parameters and generates instructions: Send a depth adjustment signal to the lifting module to drive the dynamic extraction device to move to the target coal seam; Send power commands to the variable frequency extraction pump set to adjust the extraction negative pressure intensity; S3. Perform the operation at the target depth: The telescopic cylinder (6) drives the slip ring (23) of the upper casing (201) to make the support plate (21) radially open and clamp the well wall, while pushing the wedge (33) to radially expand the sealing ring (3) to press the well wall; S4. The length of the closed section is dynamically adjusted by raising and lowering the extraction pipe (1): After the moving extraction pipe (1) changes the distance between the upper casing (201) and the lower casing (202), similarly, the support plate (21) and sealing ring (3) corresponding to the lower casing (202) are pressed against the well wall. S5. Perform air intake self-cleaning: When the lower sleeve (202) is fixed, the lifting extraction pipe (1) drives the connecting rod (205) to move axially; The connecting rod (205) rotates by engaging with the fixing nut (207) through a large lead thread, driving the scraper (206) to scrape the inner wall of the extraction pipe (1) to remove coal ash.

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