Gas detection pipe network mounting structure for underground gas extraction drilling

Abstract

The utility model discloses a gas detection pipe network installation structure for underground gas extraction drilling. The gas detection pipe network installation structure comprises a slag discharging barrel and a methane detector installed on the slag discharging barrel in a sealed mode. The methane detector is in sealed connection with the deslagging barrel through an air entraining three-way pipe, the air entraining three-way pipe comprises a main channel and a gas leading-out channel externally connected with an exhaust pipe, the lower end of the main channel is in sealed connection with the deslagging barrel, and the upper end of the main channel is in sealed connection with an air entraining seat; a first gas guide pipe and a second gas guide pipe which are vertically arranged are arranged in the gas guide seat, the upper end of the first gas guide pipe is in sealed connection with a gas inlet connector of the methane detector, the lower end of the first gas guide pipe extends out of the gas guide seat and is arranged towards the slag discharging barrel, and the upper end of the second gas guide pipe is in sealed connection with an exhaust connector of the methane detector, and the lower end of the second gas guide pipe extends out of the slag discharging barrel after extending out of the gas guide seat. The gas guide-out channel is arranged; a baffle is arranged on one side of the first gas guide pipe, the upper end of the baffle is connected with the gas guide seat, and the lower end of the baffle is located below the center line of the gas guide-out channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of underground exploration coal mining, concretely relates to a gas detection pipe network mounting structure for underground gas extraction drilling. BACKGROUND

[0002] Underground gas extraction drilling is an important technical measure in coal mine safety, mainly used for extracting gas (main component is methane) in coal seam to reduce the risk of gas accumulation in the mine, thereby improving the safety of coal mining. In addition, gas extraction can also provide resource basis for subsequent coalbed methane (coal mine gas) development and utilization. When gas extraction drilling is used, the drill bit will continuously spray water to cool down during drilling, and at the same time, during drilling, the methane gas, water and impurities such as coal ash around the drill bit are introduced into the slag removal bucket through the extraction pipe. The mixture of water and coal ash will be deposited at the lower end of the slag removal bucket, and methane will be at the upper end. In order to detect methane and avoid safety hazards caused by excessive methane in the slag removal bucket, a detector is usually arranged on the slag removal bucket to detect the concentration of methane, and a gas exhaust pipe is sealingly connected to the slag removal bucket to guide the methane out through the gas pump arranged outside the well. When the above structure is used to directly detect the gas concentration in the slag removal bucket, the lower end of the detector extends into the slag removal bucket, and the humidity in the slag removal bucket is high, which will interfere with the detection result of the detector, making the detection result not accurate enough. SUMMARY

[0003] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a gas detection pipe network mounting structure for underground gas extraction drilling, which solves the problem that the detector is directly connected to the slag removal bucket and the air humidity in the slag removal bucket is high, affecting the detection accuracy.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0005] The application discloses a gas detection pipe network installation structure for a gas extraction drilling hole in a well, which comprises a slag discharge bucket and a methane detector which is sealingly installed above the slag discharge bucket; the methane detector is sealingly connected with the slag discharge bucket through an air guide tee pipe; the air guide tee pipe comprises a vertical main channel and a gas guiding channel which is transversely arranged and externally connects an exhaust pipe; the lower end of the main channel is sealingly connected with the slag discharge bucket; the upper end of the main channel is sealingly connected with an air guide seat; a first gas guide pipe and a second gas guide pipe are vertically arranged in the air guide seat; the upper end of the first gas guide pipe is sealingly connected with an air inlet joint of the methane detector; the lower end of the first gas guide pipe is arranged outside the air guide seat and faces the slag discharge bucket; the upper end of the second gas guide pipe is sealingly connected with an air outlet joint of the methane detector; the lower end of the second gas guide pipe is arranged outside the air guide seat and faces the gas guiding channel; a baffle is arranged on one side of the first gas guide pipe; the upper end of the baffle is connected with the air guide seat; and the lower end of the baffle is below the center line of the gas guiding channel. In this way, the slag discharge bucket and the methane detector are connected through the air guide tee pipe; the gas in the slag discharge bucket flows to the main channel under the action of negative pressure; part of the gas is directly guided to the exhaust pipe through the gas guiding channel and is transported to a gas storage tank on the well through the exhaust pipe; part of the gas is guided to the air inlet joint of the methane detector through the first gas guide pipe and enters the methane detector to detect the concentration of the gas; after detection, the gas in the methane detector is guided to the gas guiding channel through the second gas guide pipe and is finally guided to the exhaust pipe through the gas guiding channel and is transported to the gas storage tank. In the structure, the lower end of the methane detector is not arranged in the slag discharge bucket but is arranged outside the slag discharge bucket and is connected with the slag discharge bucket through the air guide tee pipe; compared with the gas in the slag discharge bucket, the gas in the air guide tee pipe has smaller air humidity because the main channel is vertically arranged and has a certain height difference with the high humidity environment of the slag discharge bucket; therefore, the air humidity of the gas which enters the methane detector through the main channel is smaller than the air humidity in the slag discharge bucket, water vapor cannot be condensed on the optical element, and the detection result is more accurate. The gas which enters the detector is guided to the gas guiding channel through the second gas guide pipe, the air containing methane can be prevented from being discharged into the environment in the well to cause a safety hazard, and methane recovery is more complete. The baffle arranged on one side of the first gas guide pipe can guide part of the gas to the first gas guide pipe and ensure that sufficient gas required for detection enters the air inlet of the first gas guide pipe.

[0006] Further, an internal thread is arranged at the upper end of the main channel; the lower end of the air guide seat is sleeved on the upper end of the main channel and is threadedly connected with the main channel. In this way, the air guide seat and the main channel are connected through threads, the connection structure is stable, and the sealing effect is relatively good.

[0007] Further, a raw rubber tape is further wound on the lower end of the air guide seat. In this way, the sealing performance between the main channel and the air guide seat can be effectively improved after the raw rubber tape is wound on the lower end of the air guide seat.

[0008] Further, a connecting flange plate is arranged at the lower end of the main passage of the air guide tee joint, a first flange plate is arranged at the upper end of the slag discharging bucket, the connecting flange plate corresponds to the first flange plate and is connected through fasteners, and a sealing ring is arranged between the first flange plate and the connecting flange plate. In this way, the air guide tee joint and the slag discharging bucket are connected and fixed through the flange plates, the installation structure is stable, and the sealing effect is also good after the sealing ring is arranged in the middle. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 Structure diagram of a gas detection pipe network installation structure for a downhole gas extraction borehole in the embodiment. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0011] It should be noted that similar reference numerals and letters refer to similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed during use, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "linked" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0012] As Figure 1As shown, the gas detection pipe network installation structure for the gas extraction drilling hole provided by the embodiment comprises a residue discharge bucket 1 and a methane detector 4 sealingly installed above the residue discharge bucket 1; the methane detector 4 is sealingly connected with the residue discharge bucket 1 through an air guiding tee pipe 2, the air guiding tee pipe 2 comprises a vertical main channel 21 and a gas guiding channel 22 which is transversely arranged and externally connects an exhaust pipe, the lower end of the main channel 21 is sealingly connected with the residue discharge bucket 1, the upper end of the main channel 21 is sealingly connected with an air guiding seat 3, a first gas guiding pipe 31 and a second gas guiding pipe 32 which are vertically arranged are arranged in the air guiding seat 3, the upper end of the first gas guiding pipe 31 is sealingly connected with the air inlet joint of the methane detector 4, the lower end of the first gas guiding pipe 31 extends out of the air guiding seat 3 and is arranged towards the residue discharge bucket 1, the upper end of the second gas guiding pipe 32 is sealingly connected with the air outlet joint of the methane detector 4, the lower end of the second gas guiding pipe 32 extends out of the air guiding seat 3 and is arranged towards the gas guiding channel 22 (as shown in the figure, the lower end of the second gas guiding pipe is bent towards the gas guiding channel), a baffle 33 is arranged on one side of the first gas guiding pipe 31, the upper end of the baffle 33 is connected with the air guiding seat 3, and the lower end of the baffle 33 is below the center line of the gas guiding channel 22. In this way, the residue discharge bucket 1 and the methane detector 4 are connected through the air guiding tee pipe 2, the gas in the residue discharge bucket 1 flows to the main channel 21 under the action of negative pressure, part of the gas is directly guided to the exhaust pipe which is connected with the gas guiding channel 22 through the gas guiding channel 22 and is transported to the gas storage tank on the well through the exhaust pipe, part of the gas is guided to the air inlet joint of the methane detector 4 through the first gas guiding pipe 31, enters the methane detector 4, and the concentration of the gas is detected, after the detection, the gas in the methane detector 4 is guided to the gas guiding channel 22 through the second gas guiding pipe 32, is finally guided to the exhaust pipe through the gas guiding channel 22, and is finally transported to the gas storage tank. By adopting the structure, the lower end of the methane detector 4 is not arranged in the residue discharge bucket 1, but is arranged outside the residue discharge bucket 1 and is connected with the residue discharge bucket 1 through the air guiding tee pipe 2, the gas in the air guiding tee pipe 2 has smaller air humidity than the gas in the residue discharge bucket 1 because the main channel 21 is vertically arranged and has a certain height difference with the high humidity environment of the residue discharge bucket 1, therefore, the air humidity of the gas which enters the methane detector through the main channel 21 is smaller than the air humidity in the residue discharge bucket 1, the water vapor will not condense on the optical element, and the detection result is more accurate. The gas which enters the detector is guided to the gas guiding channel 22 through the second gas guiding pipe, the air containing methane can be avoided from being discharged to the underground environment, the safety hidden danger is avoided, and the methane recovery is more complete. The baffle 33 arranged on one side of the first gas guiding pipe 31 can guide part of the gas to the first gas guiding pipe 31, and ensures that the air inlet of the first gas guiding pipe 31 has sufficient gas required for detection.

[0013] Specifically, the baffle 33 in the embodiment is in close contact with the first air guide pipe 31, and the side end is in close contact with the side wall of the main channel 21. The air inlet at the lower end of the first air guide pipe 31 is inclined. This arrangement can divide the upper end of the main channel 21 into two spaces, and the baffle 33 can guide part of the methane-containing gas to the first air guide pipe 31, so that after the gas enters the first air guide pipe 31, it enters the detector for concentration measurement. The methane detector 4 provided in the specific implementation can be other gas detector. Or install a detector capable of detecting other gases beside the methane detector 4, which can be connected through another three-way pipe.

[0014] Further, the upper end of the main channel 21 is provided with an internal thread, and the lower end of the air guide seat 3 is sleeved on the upper end of the main channel 21 and is threadedly connected with the main channel 21. In this way, the air guide seat 3 and the main channel 21 are connected through threads, the connection structure is stable, and the sealing effect is relatively good.

[0015] To further increase the sealing performance between the main channel 21 and the air guide seat 3, a raw rubber tape is wound around the lower end of the air guide seat 3; the air guide seat 3 in the embodiment has a structure with a large upper end and a small lower end, and a step is arranged in the middle of the air guide seat 3. A rubber gasket is sleeved on the lower end of the air guide seat 3. In this way, after the raw rubber tape is wound around the lower end of the air guide seat 3, the sealing performance between the main channel 21 and the air guide seat 3 can be effectively increased. The rubber gasket arranged on the air guide seat 3 is pressed between the step of the air guide seat 3 and the upper end face of the main channel 21 after the air guide seat 3 is threadedly connected with the main channel 21, which can further increase the sealing performance between the main channel 21 and the air guide seat 3.

[0016] Further, a connecting flange plate 23 is arranged at the lower end of the main channel 21 of the air guide three-way pipe 2, a first flange plate 11 is arranged at the upper end of the slag bucket 1, the connecting flange plate 23 corresponds to the first flange plate 11 and is connected through fasteners, and a sealing ring is arranged between the first flange plate 11 and the connecting flange plate 23. In this way, the air guide three-way pipe 2 and the slag bucket 1 are fixedly connected through the flange plates, the mounting structure is stable, and the sealing effect is also good after the sealing ring is arranged in the middle. Of course, in specific implementation, the two flange plates can also be sealed by welding.

[0017] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the technical solutions. Those skilled in the art should understand that those who modify or equivalently replace the technical solutions of the present application without departing from the purpose and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A gas detection pipe network installation structure for a gas extraction borehole in a mine, comprising a slag discharge bucket and a methane detector installed in the slag discharge bucket, characterized in that, The methane detector is connected with the residue bucket through an air guide tee joint, the air guide tee joint comprises a vertical main channel and a gas guide channel which is transversely arranged and circumscribes the exhaust pipe, the lower end of the main channel is connected with the residue bucket, the upper end of the main channel is connected with an air guide seat, the air guide seat is provided with a first gas guide pipe and a second gas guide pipe which are vertically arranged, the upper end of the first gas guide pipe is connected with the air inlet joint of the methane detector, the lower end of the first gas guide pipe is arranged outside the air guide seat and faces the residue bucket, the upper end of the second gas guide pipe is connected with the air outlet joint of the methane detector, the lower end of the second gas guide pipe is arranged outside the air guide seat and faces the gas guide channel, a baffle is arranged on one side of the first gas guide pipe, the upper end of the baffle is connected with the air guide seat, and the lower end of the baffle is below the center line of the gas guide channel.

2. The gas detection pipe network installation structure for a gas extraction borehole according to claim 1, characterized by, The upper end of the main channel is provided with an internal thread, the lower end of the air guide seat is sleeved on the upper end of the main channel and is threadedly connected with the main channel.

3. The gas detection pipe network installation structure for a gas extraction borehole according to claim 2, characterized by, The lower end of the air guide seat is further wound with a raw rubber belt.

4. The gas detection pipe network installation structure for a gas extraction borehole according to claim 1 or 2 or 3, characterized by, The main channel of the air guide tee joint is provided with a connecting flange plate, the residue bucket is provided with a first flange plate, the connecting flange plate corresponds to the first flange plate and is connected through fasteners, and a sealing ring is arranged between the first flange plate and the connecting flange plate.

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