Nitrogen injection structure

Abstract

The utility model provides a nitrogen injection structure which comprises a nitrogen injection pipeline, nitrogen in the nitrogen injection pipeline is injected from the shielding piece side of a goaf to the area, close to one side of the shielding piece, of the goaf, and then the nitrogen in the area, close to one side of the shielding piece, of the goaf is gradually diffused to the area, close to one side of a working face, of the goaf. Compared with a nitrogen injection mode in the prior art, the nitrogen in the nitrogen injection pipeline is injected into the area, close to one side of the shielding piece, of the goaf, and the nitrogen is not prone to escaping to the working face, so that the nitrogen injection effect of the goaf is ideal, the fire preventing and extinguishing effect of the goaf is ideal, and the low-oxygen phenomenon of the working face cannot be caused.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen injection in goafs, and more specifically, to a nitrogen injection structure. Background Art

[0002] Spontaneous coal combustion fire is one of the main disasters in coal mines. Coal mine fire accidents not only produce a large amount of toxic and harmful gases, seriously threatening the lives of underground workers, but also cause more serious secondary disasters such as coal dust and gas explosions triggered by the fire.

[0003] During the face mining process, if the roof of the goaf does not collapse in time, it will cause the goaf not to be blocked in time; the unblocked goaf has a large air leakage, and the residual coal in the goaf is prone to spontaneous combustion under oxygen-rich conditions, with a high degree of danger. Therefore, the goaf is the key area for fire prevention and extinguishment.

[0004] Common goaf fire prevention and extinguishment measures are grouting and nitrogen injection into the goaf.

[0005] The working face is located on one side of the goaf, and a shielding member is provided on the side of the goaf facing away from the working face to form a shield for the side of the goaf facing away from the working face through the shielding member.

[0006] The existing nitrogen injection method is as follows: a nitrogen injection pipeline is laid on the intake side of the working face, and the output end of the nitrogen injection pipeline extends into the goaf from the working face side to inject nitrogen into the area near the working face side of the goaf. In this way, the nitrogen in the nitrogen injection pipeline is transported to the area near the working face side of the goaf, and the nitrogen in the area near the working face side of the goaf gradually diffuses to the area near the shielding member side of the goaf. This nitrogen injection method is an open nitrogen injection method.

[0007] As the mining work progresses, the working face gradually moves away from the shielding member, and the goaf also gradually expands away from the shielding member. In the specific implementation process, as the working face gradually moves away from the shielding member and the goaf gradually expands away from the shielding member, the nitrogen injection pipeline will be laid multiple times; however, each time the nitrogen injection pipeline is laid along the intake airway of the working face, and the output end of each laid nitrogen injection pipeline extends into the expanded goaf from the working face side to inject nitrogen into the area near the working face side of the expanded goaf. The nitrogen in each laid nitrogen injection pipeline is transported to the area near the working face side of the expanded goaf, and the nitrogen in the area near the working face side of the expanded goaf gradually diffuses to the area near the shielding member side of the goaf. Because the working face gradually moves away from the shielding member and the goaf gradually expands away from the shielding member, the output end of each laid nitrogen injection pipeline is farther away from the shielding member than the output end of the previously laid nitrogen injection pipeline.

[0008] Compared with the shielding side of the goaf, the working face side of the goaf is open; therefore, using the nitrogen injection method of the existing technology, the nitrogen injected into the area close to the working face of the goaf is easy to escape to the working face, which not only leads to unsatisfactory nitrogen injection effect in the goaf and unsatisfactory fire prevention and extinguishing effect in the goaf, but also causes hypoxia on the working face, threatening the personal safety of workers on the working face, and is of great danger. Utility Model Content

[0009] The main purpose of the utility model is to provide a nitrogen injection structure to solve the problem that the fire prevention and extinguishing effect of the nitrogen injection method in the prior art is not ideal and also causes hypoxia on the working surface.

[0010] In order to achieve the above-mentioned purpose, the utility model provides a nitrogen injection structure, which is suitable for a goaf, wherein a working face is located on one side of the goaf, and a shielding member is provided on the side of the goaf away from the working face so as to shield the side of the goaf away from the working face through the shielding member; the nitrogen injection structure includes a nitrogen injection pipeline, and the output end of the nitrogen injection pipeline extends into the goaf from the shielding member side so as to inject nitrogen into an area on one side of the goaf close to the shielding member.

[0011] Furthermore, the nitrogen injection structure also includes: a drainage channel, which is located on the side of the shielding member away from the goaf to receive the liquid discharged from the goaf; a delivery pipeline, which is laid along the drainage channel and is used to accommodate nitrogen; the input end of the nitrogen injection pipeline is connected to the lumen of the delivery pipeline.

[0012] Furthermore, the axial direction of the delivery pipeline and the axial direction of the nitrogen injection pipeline are arranged at an angle.

[0013] Furthermore, there are multiple nitrogen injection pipelines, and the multiple nitrogen injection pipelines are distributed in a direction perpendicular to the distribution direction of the working face and the goaf.

[0014] Furthermore, the drainage channel includes a first channel, a second channel and a third channel, one end of the first channel is connected and communicated with a first end of the second channel, and a second end of the second channel is connected and communicated with the third channel.

[0015] Furthermore, the delivery pipeline includes a first pipeline, a second pipeline and a third pipeline; the first pipeline is laid along the first channel, the second pipeline is laid along the second channel, and the third pipeline is laid along the third channel; one end of the first pipeline is connected and communicated with the first end of the second pipeline, and the second end of the second pipeline is communicated with the lumen of the third pipeline; the input end of the nitrogen injection pipeline is communicated with the lumen of the first pipeline.

[0016] Furthermore, the extension direction of the first channel is set at an angle to the distribution direction of the working face and the goaf.

[0017] Further, the extending direction of the third channel is set at an angle to the distribution directions of the working face and the goaf.

[0018] Further, the extending direction of the second channel is parallel or the same as the distribution directions of the working face and the goaf.

[0019] Further, the shielding member includes a wall portion, and the nitrogen injection pipeline is arranged through the wall portion.

[0020] Applying the technical solution of the present utility model, the nitrogen in the nitrogen injection pipeline is injected into the area on the side of the goaf close to the shielding member from the side of the shielding member in the goaf, and then the nitrogen in the area on the side of the goaf close to the shielding member gradually diffuses to the area on the side of the goaf close to the working face. Compared with the nitrogen injection method in the prior art, the nitrogen in the nitrogen injection pipeline of this application is not easily dispersed to the working face when injected into the area on the side of the goaf close to the shielding member, so that the nitrogen injection effect in the goaf is relatively ideal, the fire prevention and extinguishing effect in the goaf is relatively ideal, and the phenomenon of low oxygen in the working face will not be caused. Description of the Drawings

[0021] The attached drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0022] Figure 1 Shows a schematic structural diagram of an embodiment of a nitrogen injection structure according to the present utility model.

[0023] Among them, the above-mentioned attached drawings include the following reference numerals:

[0024] 11, goaf; 12, working face; 13, working face intake airway; 14, working face return airway; 15, wall portion;

[0025] 30, drainage channel; 31, first channel; 32, second channel; 33, third channel; 40, conveying pipeline; 41, first pipeline; 42, second pipeline; 43, third pipeline; 50, nitrogen injection pipeline. Detailed Embodiments

[0026] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the attached drawings and in combination with the embodiments.

[0027] It should be pointed out that the following detailed descriptions are all illustrative and are intended to provide further descriptions of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Please refer to Figure 1 , the working face 12 is located on one side of the goaf 11, and a shielding member is provided on the side of the goaf 11 facing away from the working face 12 to form a shield for the side of the goaf 11 facing away from the working face 12 through the shielding member.

[0030] The working face intake airway 13 is located on the side of the working face 12 facing away from the goaf 11, and the working face return airway 14 is located on the side of the working face 12 facing away from the goaf 11; the working face intake airway 13 and the working face return airway 14 are distributed in a direction perpendicular to the distribution direction of the working face 12 and the goaf 11. One end of the working face intake airway 13 is connected and communicated with the working face 12, and one end of the working face return airway 14 is connected and communicated with the working face 12. The fresh air flowing in from the working face intake airway 13 can enter the working face 12, and the air in the working face 12 can flow out from the working face return airway 14.

[0031] Optionally, the shielding member is a wall or a structure similar to a wall.

[0032] It should be noted that along the distribution direction of the working face 12 and the goaf 11, the goaf 11 includes a region close to the working face 12 and a region close to the shielding member.

[0033] In the prior art, the nitrogen injection pipeline is laid along the working face intake airway 13, and the output end of the nitrogen injection pipeline extends into the goaf 11 from the working face side to inject nitrogen into the region of the goaf 11 close to the working face 12. In this way, the nitrogen in the nitrogen injection pipeline is transported to the region of the goaf 11 close to the working face 12, and the nitrogen in the region of the goaf 11 close to the working face 12 gradually diffuses to the region of the goaf 11 close to the shielding member.

[0034] As the mining work progresses, the working face 12 gradually moves away from the shielding member, and the gob area 11 also gradually expands away from the shielding member. During the specific implementation process, as the working face 12 gradually moves away from the shielding member and the gob area 11 gradually expands away from the shielding member, the nitrogen injection pipelines will be laid multiple times; however, each time the nitrogen injection pipeline is laid along the intake airway 13 of the working face, and the output end of the nitrogen injection pipeline laid each time extends into the expanded gob area 11 from the working face side, so as to inject nitrogen into the area on the side of the expanded gob area 11 close to the working face 12. The nitrogen in the nitrogen injection pipeline laid each time is transported to the area on the side of the expanded gob area 11 close to the working face 12, and the nitrogen in the area on the side of the expanded gob area 11 close to the working face 12 gradually diffuses to the area on the side of the gob area 11 close to the shielding member. Because the working face 12 gradually moves away from the shielding member and the gob area 11 gradually expands away from the shielding member, the output end of the nitrogen injection pipeline laid each time is farther away from the shielding member than the output end of the nitrogen injection pipeline laid last time.

[0035] Compared with the shielding member side of the gob area 11, the working face 12 side of the gob area 11 is open; therefore, using the nitrogen injection method of the prior art, the nitrogen injected into the area on the side of the gob area 11 close to the working face 12 is likely to escape to the working face 12, which not only results in an unsatisfactory fire prevention and extinguishing effect in the gob area 11, but also causes the phenomenon of low oxygen in the working face 12.

[0036] In view of the problems existing in the nitrogen injection method of the prior art, the present utility model provides a nitrogen injection structure. Please refer to Figure 1 , the nitrogen injection structure is applicable to the gob area 11. The nitrogen injection structure includes a nitrogen injection pipeline 50, and the output end of the nitrogen injection pipeline 50 extends into the gob area 11 from the shielding member side to inject nitrogen into the area on the side of the gob area 11 close to the shielding member.

[0037] In the laying method of the nitrogen injection pipeline 50 of the present application, the nitrogen in the nitrogen injection pipeline 50 is injected into the area on the side of the gob area 11 close to the shielding member from the shielding member side of the gob area 11, and the nitrogen in the area on the side of the gob area 11 close to the shielding member gradually diffuses to the area on the side of the gob area 11 close to the working face 12.

[0038] Compared with the nitrogen injection method of the prior art, the nitrogen in the nitrogen injection pipeline 50 of the present application is not likely to escape to the working face 12 when injected into the area on the side of the gob area 11 close to the shielding member, so that the nitrogen injection effect in the gob area 11 is relatively ideal, the fire prevention and extinguishing effect in the gob area 11 is relatively ideal, and it will not cause the phenomenon of low oxygen in the working face 12, ensuring the personal safety of the operating personnel in the working face 12.

[0039] Compared with the nitrogen injection method of the prior art, the nitrogen injection method of the present application is a semi-closed nitrogen injection method.

[0040] In this embodiment, the nitrogen injection structure further includes a water drainage channel 30 and a conveying pipeline 40; the water drainage channel 30 is located on the side of the shielding member away from the gob area 11 to receive the liquid discharged from the gob area 11, that is, the drainage in the gob area 11 is discharged into the water drainage channel 30 and then drained away through the water drainage channel 30; the conveying pipeline 40 is laid along the water drainage channel 30, and nitrogen is accommodated in the conveying pipeline 40; the input end of the nitrogen injection pipeline 50 is communicated with the lumen of the conveying pipeline 40, so that the nitrogen in the conveying pipeline 40 flows into the nitrogen injection pipeline 50 and is then output from the output end of the nitrogen injection pipeline 50.

[0041] Optionally, the axial direction of the conveying pipeline 40 and the axial direction of the nitrogen injection pipeline 50 are arranged at an angle.

[0042] Optionally, the axial direction of the nitrogen injection pipeline 50 is parallel or the same as the distribution direction of the working face 12 and the gob area 11.

[0043] Optionally, there are multiple nitrogen injection pipelines 50, and the multiple nitrogen injection pipelines 50 are distributed in a direction perpendicular to the distribution direction of the working face 12 and the gob area 11.

[0044] Optionally, the multiple nitrogen injection pipelines 50 are spaced apart in a direction perpendicular to the distribution direction of the working face 12 and the gob area 11.

[0045] As Figure 1 shown, there are two nitrogen injection pipelines 50. Along the direction perpendicular to the distribution direction of the working face 12 and the gob area 11, the gob area 11 has two opposite sides; the two nitrogen injection pipelines 50 are arranged in one-to-one correspondence with the two sides, and each nitrogen injection pipeline 50 is arranged close to the corresponding side.

[0046] In this embodiment, the water drainage channel 30 includes a first channel 31, a second channel 32 and a third channel 33; one end of the first channel 31 is connected and communicated with the first end of the second channel 32, and the second end of the second channel 32 is connected and communicated with the third channel 33.

[0047] Specifically, the third channel 33 is a boundary water drainage roadway.

[0048] Optionally, the extending direction of the first channel 31 is arranged at an angle with the distribution direction of the working face 12 and the gob area 11.

[0049] Optionally, the extending direction of the third channel 33 is arranged at an angle with the distribution direction of the working face 12 and the gob area 11.

[0050] Optionally, the extending direction of the second channel 32 is parallel or the same as the distribution direction of the working face 12 and the gob area 11.

[0051] Optionally, the extending direction of the first channel 31 is set at an obtuse angle to the extending direction of the second channel 32, and the extending direction of the second channel 32 and the extending direction of the third channel 33 are set at an acute or obtuse angle.

[0052] In this embodiment, the conveying pipeline 40 includes a first pipeline 41, a second pipeline 42 and a third pipeline 43; the first pipeline 41 is laid along the first channel 31, the second pipeline 42 is laid along the second channel 32, and the third pipeline 43 is laid along the third channel 33; one end of the first pipeline 41 is connected and communicated with the first end of the second pipeline 42, and the second end of the second pipeline 42 is communicated with the lumen of the third pipeline 43; the input end of the nitrogen injection pipeline 50 is communicated with the lumen of the first pipeline 41.

[0053] Optionally, the nitrogen in the third pipeline 43 flows into the first pipeline 41 through the second pipeline 42.

[0054] Optionally, the axis of the nitrogen injection pipeline 50 is arranged at an angle to the axis of the first pipeline 41.

[0055] Optionally, the input end of one of the nitrogen injection pipelines 50 is connected to the first end of the first pipeline 41, and the first end of the first pipeline 41 is connected and communicated with the first end of the second pipeline 42.

[0056] Specifically, the extending direction of the first pipeline 41 is parallel or the same as the extending direction of the first channel 31; the extending direction of the second pipeline 42 is parallel or the same as the extending direction of the second channel 32; the extending direction of the third pipeline 43 is parallel or the same as the extending direction of the third channel 33.

[0057] In this embodiment, the shielding member includes a wall portion 15, and the nitrogen injection pipeline 50 is passed through the wall portion 15.

[0058] Optionally, when there are multiple nitrogen injection pipelines 50, the shielding member includes multiple wall portions 15, and the multiple nitrogen injection pipelines 50 are respectively passed through the multiple wall portions 15.

[0059] In this embodiment, one end of the water outlet pipe extends into the gob area 11; the other end of the water outlet pipe extends into the water drainage channel 30 or is connected and communicated with the drainage pipeline laid in the water drainage channel 30, so as to realize draining the water in the gob area 11 into the water drainage channel 30 or the drainage pipeline in the water drainage channel 30 through the water outlet pipe, and then draining it away through the water drainage channel 30 or the drainage pipeline in the water drainage channel 30.

[0060] In this embodiment, the nitrogen injection pipeline 50 and the conveying pipeline 40 can be recycled and reused.

[0061] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

[0062] In the nitrogen injection structure provided by the present utility model, nitrogen in the nitrogen injection pipeline 50 is injected into the area on the side of the gob 11 close to the shielding member from the side of the shielding member in the gob 11, and then the nitrogen in the area on the side of the gob 11 close to the shielding member gradually diffuses to the area on the side of the gob 11 close to the working face 12. Compared with the nitrogen injection method of the prior art, the nitrogen in the nitrogen injection pipeline 50 of the present application is not easily dispersed to the working face 12 when injected into the area on the side of the gob 11 close to the shielding member, so that the nitrogen injection effect in the gob 11 is relatively ideal, the fire prevention and extinguishing effect in the gob 11 is relatively ideal, and the phenomenon of low oxygen in the working face 12 will not be caused.

[0063] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0064] For the convenience of description, spatial relative terms such as "above...", "above...", "on the upper surface of...", "above" and the like can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "beneath other devices or structures" afterwards. Thus, the exemplary term "above..." can include both orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0065] The above are only the preferred embodiments of the present utility model, and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A nitrogen injection structure, suitable for a goaf (11), wherein a working face (12) is located on one side of the goaf (11), and a shielding member is provided on the side of the goaf (11) away from the working face (12), so that the shielding member shields the side of the goaf (11) away from the working face (12); characterized in that: The nitrogen injection structure comprises: A nitrogen injection pipeline (50), wherein an output end of the nitrogen injection pipeline (50) extends from the shielding member side into the goaf (11) so as to inject nitrogen into a side area of the goaf (11) close to the shielding member.

2. The nitrogen injection structure according to claim 1, characterized in that, The nitrogen injection structure also includes: a drainage channel (30), the drainage channel (30) being located on a side of the shielding member away from the goaf (11) so as to receive liquid discharged from the goaf (11); A delivery pipeline (40) is laid along the drainage channel (30), and the delivery pipeline (40) is used to contain nitrogen; the input end of the nitrogen injection pipeline (50) is connected to the lumen of the delivery pipeline (40).

3. The nitrogen injection structure according to claim 2, characterized in that, The axial direction of the delivery pipeline (40) and the axial direction of the nitrogen injection pipeline (50) are arranged at an angle.

4. The nitrogen injection structure according to claim 2, characterized in that, There are a plurality of nitrogen injection pipelines (50), and the plurality of nitrogen injection pipelines (50) are distributed in a direction perpendicular to the distribution direction of the working face (12) and the goaf (11).

5. The nitrogen injection structure according to claim 2, characterized in that, The drainage channel (30) comprises a first channel (31), a second channel (32) and a third channel (33); one end of the first channel (31) is connected to and communicates with a first end of the second channel (32); and a second end of the second channel (32) is connected to and communicates with the third channel (33).

6. The nitrogen injection structure according to claim 5, characterized in that, The delivery pipeline (40) comprises a first pipeline (41), a second pipeline (42) and a third pipeline (43); the first pipeline (41) is laid along the first channel (31), the second pipeline (42) is laid along the second channel (32), and the third pipeline (43) is laid along the third channel (33); One end of the first pipeline (41) is connected to and communicates with the first end of the second pipeline (42), and the second end of the second pipeline (42) is communicated with the lumen of the third pipeline (43); the input end of the nitrogen injection pipeline (50) is communicated with the lumen of the first pipeline (41).

7. The nitrogen injection structure according to claim 5, characterized in that, The extension direction of the first channel (31) is arranged at an angle to the distribution direction of the working face (12) and the goaf (11).

8. The nitrogen injection structure according to claim 5, characterized in that, The extension direction of the third channel (33) is arranged at an angle to the distribution direction of the working face (12) and the goaf (11).

9. The nitrogen injection structure according to claim 5, characterized in that, The extension direction of the second channel (32) is parallel to or the same as the distribution direction of the working face (12) and the goaf (11).

10. The nitrogen injection structure according to claim 1, characterized in that, The shielding member comprises a wall portion (15), and the nitrogen injection pipeline (50) is passed through the wall portion (15).

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