A ground concentration detection device for coal seam gas pressure relief gas well

Abstract

The utility model discloses a coal bed gas pressure relief gas well ground concentration detection device relates to gas detection technical field, including detector, the one side of detector is provided with stirring subassembly, a plurality of shunt components are arranged in the one side of stirring subassembly, the stirring subassembly includes stirring box, the inside of stirring box is opened with collection cabin, stirring cabin, gear cabin and drive cabin from top to bottom in proper order, a plurality of downflow holes are opened in the lower surface of collection cabin, a plurality of stirring rods are provided in stirring cabin, a plurality of stirring vanes are arranged on each stirring rod, the inside rotation of gear cabin is connected with driving gear and two driven gears, the utility model discloses a shunt component and stirring subassembly are arranged, and the instantaneous peak and low of gas concentration are effectively suppressed, obtain a high uniformity representative gas sample, to ensure the authenticity and accuracy of detection result.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, specifically a surface concentration detection device for coalbed methane depressurization gas wells. Background Technology

[0002] Coalbed methane depressurization wells play a vital role in coal mine safety. They mainly reduce the gas content in coal seams and mining spaces through negative pressure extraction, effectively preventing safety accidents such as gas outbursts.

[0003] However, in actual extraction processes, the concentration of methane gas in the extracted coalbed methane exhibits significant instability, fluctuating frequently within a wide range of 50% to 90%. This volatility stems primarily from two factors: first, human intervention in the extraction process, such as starting and stopping the extraction pump, frequency changes, or adjustments to the extraction negative pressure setting, leading to alterations in the extraction gas velocity and flow rate; second, the inherent heterogeneity of underground coalbed methane occurrence conditions, with the extraction shaft potentially traversing gas-rich or gas-poor zones at different times, causing natural fluctuations in the extracted gas concentration. This drastic concentration fluctuation presents a significant challenge to accurately measuring the true methane concentration of the extracted gas. If the concentration detection device is directly connected to the main extraction pipeline, the detection result is only an instantaneous value, failing to reflect a representative average concentration level, thus affecting the accuracy of extraction effectiveness assessment, resource utilization calculation, and safety monitoring.

[0004] Based on this, a surface concentration detection device for coalbed methane depressurization gas wells is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a surface concentration detection device for coalbed methane depressurization gas wells to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A surface concentration detection device for a coalbed methane depressurization gas well includes a detector, a stirring assembly on one side of the detector, and a plurality of diversion assemblies on one side of the stirring assembly; The mixing assembly includes a mixing tank, inside which, from top to bottom, are a collection chamber, a mixing chamber, a gear chamber, and a drive chamber. The lower surface of the collection chamber has several flow holes. The mixing chamber contains several mixing rods, each with several mixing blades arranged in an array. The gear chamber contains a driving gear and two driven gears rotatably connected inside, with the two driven gears meshing with the two sides of the driving gear. The lower end of each mixing rod passes through the gear chamber and is fixedly connected to the adjacent driving gear and driven gear. The drive chamber contains a fixedly connected rotary motor, and the driving gear is driven by the rotary motor.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions: In one alternative: an air outlet pipe is provided on one side of the mixing tank, one end of the air outlet pipe is inserted through the mixing chamber, and the other end of the air outlet pipe is provided with a connecting flange and is connected to the air inlet of the detector through the connecting flange.

[0008] In one alternative: the diversion assembly includes an air pump, the output end of which is disposed through one side of the collection chamber, the input end of which is fixedly connected to a diversion pipe, a flow deflector is disposed inside the lower end of the diversion pipe, an installation ring is disposed outside the flow deflector and is connected to the inside of the diversion pipe through the installation ring, and a filter assembly is disposed at the lower end of the diversion pipe.

[0009] In one alternative: the filter assembly includes a filter box, the upper surface of which is fixedly connected to the lower end of an adjacent diversion pipe, and the inner side of the filter box is provided with a plurality of mounting slots, each mounting slot having a filter plate slidably disposed thereon.

[0010] In one alternative: a sealing door is hinged to one side of the filter box, and a handle is fixedly connected to the middle of one side of the sealing door.

[0011] In one alternative: the filter plate is a stainless steel sintered metal mesh filter plate.

[0012] In one alternative: a control panel is fixedly connected to one side of the mixing tank.

[0013] In one alternative: the control panel is electrically connected to the stirring assembly, the flow splitting assembly, and the detector, respectively.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model, by setting up a diversion component and a stirring component, allows for simultaneous sampling from different points in the main gas flow pipeline, effectively avoiding concentration deviations caused by uneven gas enrichment in the mine due to single-point sampling. The collected gas undergoes forced and thorough mixing inside the stirring component, which effectively smooths out instantaneous peaks and troughs in gas concentration, obtaining a highly uniform and representative gas sample. This ensures the authenticity and accuracy of the detection results, providing a reliable data foundation for the evaluation of extraction effects and resource utilization, and effectively improving the use effect and practicality of this device.

[0015] 2. This utility model, by setting a filter assembly containing a stainless steel sintered metal mesh filter plate at the inlet end of the diversion pipe, can effectively intercept dust and droplets in the gas, prevent them from contaminating the interior of the mixing chamber and the precision detector, and ensure the long-term stable operation and detection accuracy of the system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the shunt component structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the filter assembly structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the internal structure of the stirring assembly of this utility model.

[0020] Figure 5 This is an exploded view of the stirring assembly structure of this utility model.

[0021] Figure 6 This is a partial structural schematic diagram of the present invention.

[0022] Figure reference numerals: 1. Mixing tank; 2. Diverter pipe; 3. Air pump; 4. Air outlet pipe; 5. Connecting flange; 6. Control panel; 7. Filter box; 8. Mounting ring; 9. Baffle; 10. Sealing door; 11. Mounting groove; 12. Filter plate; 13. Handle; 14. Downflow hole; 15. Stirring blade; 16. Stirring rod; 17. Drive gear; 18. Driven gear; 19. Rotary motor; 20. Detector. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] In one embodiment, such as Figures 1-6As shown, a surface concentration detection device for a coalbed methane depressurization gas well includes a detector 20, a stirring assembly is provided on one side of the detector 20, and a plurality of diversion assemblies are provided on one side of the stirring assembly; The stirring assembly includes a stirring tank 1. Inside the stirring tank 1, from top to bottom, there are a collection chamber, a stirring chamber, a gear chamber, and a drive chamber. The lower surface of the collection chamber has several flow holes 14. The stirring chamber is equipped with several stirring rods 16, and each stirring rod 16 is equipped with several stirring blades 15 arranged in an array. The gear chamber is rotatably connected to a driving gear 17 and two driven gears 18. The two driven gears 18 mesh with the two sides of the driving gear 17 respectively. The lower end of each stirring rod 16 is inserted through the gear chamber and is fixedly connected to the adjacent driving gear 17 and driven gear 18. The drive chamber is fixedly connected to a rotary motor 19, and the driving gear 17 is driven by the rotary motor 19. In this embodiment, multiple diversion pipes 2 extract gas samples from the main gas flow and send them into the collection chamber of the mixing chamber 1. After the gas enters the mixing chamber evenly through the downflow hole 14, the rotary motor 19 starts and drives the drive gear 17 to rotate. The drive gear 17 simultaneously drives the driven gears 18 on both sides to rotate in the opposite direction. The stirring rod 16 and stirring blade 15 connected to the gear rotate synchronously, performing strong and comprehensive mechanical stirring of the gas in the mixing chamber, so that the gases of different concentrations are fully mixed and uniform, thereby providing the detector 20 with a representative sample with stable concentration.

[0025] In one embodiment, such as Figure 6 As shown, a gas outlet pipe 4 is provided on one side of the mixing chamber 1. One end of the gas outlet pipe 4 extends through the mixing chamber, and the other end of the gas outlet pipe 4 is provided with a connecting flange 5, which is connected to the air inlet of the detector 20. The gas, after being thoroughly mixed by the mixing components, gathers at the top of the mixing chamber. The inlet of the gas outlet pipe 4 is located at the top of the mixing chamber and is used to extract the uniformly mixed gas. The connection between the connecting flange 5 at the end of the gas outlet pipe 4 and the air inlet of the detector 20 ensures a sealed transport of the gas sample from the mixing chamber to the detection element, preventing external air from entering and affecting the detection accuracy.

[0026] In one embodiment, such as Figure 2As shown, the diversion assembly includes an air pump 3. The output end of the air pump 3 is installed through one side of the collection chamber. The input end of the air pump 3 is fixedly connected to a diversion pipe 2. A flow disruptor 9 is installed inside the lower end of the diversion pipe 2. The flow disruptor 9 is a fixed blade type, used to initially disperse the airflow. An installation ring 8 is installed on the outside of the flow disruptor 9 and is connected to the inside of the diversion pipe 2 through the installation ring 8. A filter assembly is installed at the lower end of the diversion pipe 2. The air pump 3, as a power source, draws gas from the filter assembly and the diversion pipe 2 at its input end. The flow disruptor 9 in the diversion pipe 2 can initially disturb the incoming airflow and break up large eddies. Then, the air pump 3 pressurizes the gas and pumps it into the collection chamber of the mixing tank 1, completing the gas collection and transportation process.

[0027] In one embodiment, such as Figure 3 As shown, the filtration assembly includes a filter box 7. The upper surface of the filter box 7 is fixedly connected to the lower end of the adjacent diversion pipe 2. Several mounting slots 11 are formed inside the filter box 7, and a filter plate 12 is slidably disposed inside each mounting slot 11. Gas first enters the filter box 7. The filter plates 12 slidably placed in the multiple mounting slots 11 inside the filter box 7 form a multi-stage filtration channel. When the gas passes through these filter plates 12, the solid particles and liquid droplets carried therein are intercepted, thereby achieving preliminary purification of the gas and protecting the subsequent suction pump 3 and stirring assembly.

[0028] In one embodiment, such as Figure 3 As shown, a sealing door 10 is hinged to one side of the filter box 7. A handle 13 is fixedly connected to the middle of one side of the sealing door 10. When the filter plate 12 needs to be cleaned or replaced, the inside of the filter box 7 can be exposed by pulling the handle 13 to open the hinged sealing door 10. The operator can easily pull out the filter plate 12, which is slidably set in the mounting groove 11, along the groove for maintenance. After maintenance, it is pushed back into the groove and the sealing door 10 is closed to restore the sealed filtration state.

[0029] In one embodiment, such as Figure 3 As shown, the filter plate 12 is a stainless steel sintered metal mesh filter plate, which has high strength and corrosion resistance. Its internal microporous structure can effectively screen impurities, and it can be reused by backflushing or cleaning after being clogged, ensuring the longevity and economy of the filtration effect.

[0030] In one embodiment, such as Figure 1 As shown, a control panel 6 is fixedly connected to one side of the mixing tank 1, and the operator sets parameters through the control panel 6.

[0031] In one embodiment, such as Figure 1As shown, the control panel 6 is electrically connected to the stirring assembly, the flow distribution assembly and the detector 20 respectively. The control panel 6 serves as a central control unit, which centrally controls the start and stop of the rotary motor 19 and its speed, the operation of the vacuum pump 3 and the detection cycle of the detector 20 through the circuit.

[0032] The above embodiment discloses a surface concentration detection device for coalbed methane depressurization gas wells. Multiple gas pumps 3 extract gas samples from different points in the main gas flow pipeline via a diversion pipe 2. After impurities are filtered out by a stainless steel sintered mesh filter plate 12 inside a filter box 7, the gas samples are pumped into a collection chamber at the top of a mixing chamber 1. Subsequently, the gas flows evenly into the mixing chamber through a downflow hole 14 at the bottom of the collection chamber. At this time, a rotary motor 19 starts, driving the drive gear 17 to rotate and causing the two driven gears 18 meshing with it to rotate in the opposite direction. This causes all the stirring rods 16 and their stirring blades 15 to rotate synchronously, forcibly and thoroughly mechanically stirring and mixing the gas in the chamber to smooth out concentration fluctuations. A representative gas sample after uniform mixing is guided to a detector 20 via an outlet pipe 4 for precise concentration analysis. The entire process is centrally controlled and monitored through a control panel 6, ultimately achieving accurate measurement of coalbed methane concentration under fluctuating operating conditions.

[0033] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A surface concentration detection device for a coalbed methane depressurization gas well, comprising a detector (20), wherein a stirring assembly is provided on one side of the detector (20), and a plurality of diversion assemblies are provided on one side of the stirring assembly; Its features are, The stirring assembly includes a stirring tank (1). The stirring tank (1) has a collection chamber, a stirring chamber, a gear chamber and a drive chamber arranged from top to bottom. The lower surface of the collection chamber has several downflow holes (14). The stirring chamber is provided with several stirring rods (16). Each stirring rod (16) is provided with several stirring blades (15) arranged in an array. The gear chamber is rotatably connected to a drive gear (17) and two driven gears (18). The two driven gears (18) mesh with the two sides of the drive gear (17) respectively. The lower end of each stirring rod (16) is provided through the gear chamber and is fixedly connected to the adjacent drive gear (17) and driven gear (18). The drive chamber is fixedly connected to a rotary motor (19). The drive gear (17) is driven by the rotary motor (19).

2. The surface concentration detection device for coalbed methane depressurization gas wells according to claim 1, characterized in that, The mixing tank (1) is provided with an air outlet pipe (4) on one side. One end of the air outlet pipe (4) is installed inside the mixing chamber, and the other end of the air outlet pipe (4) is provided with a connecting flange (5) and is connected to the air inlet of the detector (20) through the connecting flange (5).

3. The surface concentration detection device for coalbed methane depressurization gas wells according to claim 1, characterized in that, The diversion assembly includes an air pump (3), the output end of which is disposed through one side of the collection chamber, and the input end of the air pump (3) is fixedly connected to a diversion pipe (2). A flow deflector (9) is disposed inside the lower end of the diversion pipe (2), and an installation ring (8) is disposed outside the flow deflector (9) and connected to the inside of the diversion pipe (2) through the installation ring (8). A filter assembly is disposed at the lower end of the diversion pipe (2).

4. The surface concentration detection device for coalbed methane depressurization gas wells according to claim 3, characterized in that, The filter assembly includes a filter box (7), the upper surface of which is fixedly connected to the lower end of the adjacent diversion pipe (2), and a number of mounting slots (11) are provided inside the filter box (7), and a filter plate (12) is slidably disposed inside each mounting slot (11).

5. The surface concentration detection device for coalbed methane depressurization gas wells according to claim 4, characterized in that, The filter box (7) is hinged to a sealing door (10) on one side, and a handle (13) is fixedly connected to the middle of one side of the sealing door (10).

6. The surface concentration detection device for coalbed methane depressurization gas wells according to claim 4, characterized in that, The filter plate (12) is a stainless steel sintered metal mesh filter plate.

7. The surface concentration detection device for coalbed methane depressurization gas wells according to claim 1, characterized in that, A control panel (6) is fixedly connected to one side of the mixing tank (1).

8. The surface concentration detection device for coalbed methane depressurization gas wells according to claim 7, characterized in that, The control panel (6) is electrically connected to the stirring assembly, the flow splitting assembly and the detector (20) respectively.

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