Coal seam deep middle hole combined water injection system and method

Abstract

A coal seam deep and middle hole combined water injection system comprises a plurality of water injection devices, the water injection devices comprise water injection pipes capable of being inserted into deep holes or middle holes, the water injection pipes are fixedly sleeved with positioning plates capable of being attached to a coal wall, the positioning plates are fixedly connected with a plurality of control nodes, and the control nodes are electrically connected with humidity sensors and indicator lamps; the humidity sensors are distributed on the peripheral sides of the water injection devices and attached to the coal wall, the indicator lamps are fixedly arranged on the positioning plate, and all the control nodes of the multiple water injection devices form a water injection monitoring network through wireless networking; the water supply device is used for supplying water to the water injection device. The condition that water seeps from the coal wall can be monitored in real time in the water injection process, then the indicator light is controlled to be turned on, and a worker can rapidly know the water injection condition of a deep hole and a middle hole and can also adjust the water injection process according to the seepage condition.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam water injection, and specifically to a combined deep and medium hole water injection system and method for coal seams. Background Art

[0002] Coal seam water injection is a commonly used technology in the process of raw coal mining. The main function of coal seam water injection is to pre-wet the coal body that has not been mined, so as to reduce or basically eliminate the generation of floating coal dust during the mining process. And reasonable water injection can improve the stability of soft coal bodies, increase the moisture content of coal and the cohesion between coal particles, reduce the brittleness of coal, greatly increase the integrity of the coal wall in the coal mining face and the two sides and the top of the roadway, effectively prevent the phenomenon of coal wall spalling, and play a role in preventing the concentrated outburst of gas caused by the spalling of soft coal walls.

[0003] The traditional coal seam water injection method usually starts from the cutting eye of the working face, drills water injection holes with a depth of not less than 4 meters into the working face, uses special hole sealing devices to seal the holes, and applies a water injection pressure of not less than 8 MPa through special water injection pumps.

[0004] During actual implementation, after each group of boreholes starts water injection, the water injection flow rate needs to be measured, and the water injection time is determined according to the situation of water droplets seeping out from the coal wall within 10 m on both sides of the hole mouth or on the upper side coal wall of the transportation roadway. After each group of water injection boreholes meets the standards, the gas drainage team should be contacted in time, and the gas drainage team will connect another group of water injection boreholes outside for water injection. Then, as the working face advances, the above water injection process is repeated to ensure that the water injection boreholes are not less than 100 m ahead of the working face.

[0005] At present, when the applicant implements the coal seam water injection technology, it mainly relies on manual inspection to judge the water seepage situation of the coal wall, which has problems of poor accuracy and poor timeliness. Summary of the Invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a combined deep and medium hole water injection system and method for coal seams, which can monitor the situation of water seeping out from the coal wall in real time during the water injection process, and then control the indicator light to turn on, enabling the staff to quickly understand the water injection situation of the deep holes and medium holes, and can also adjust the water injection process according to the seepage situation.

[0007] In order to achieve the above object, the specific solution adopted by the present invention is: a combined deep and medium hole water injection system for coal seams, comprising: Multiple water injection devices. The water injection device includes a water injection pipe that can be inserted into a deep hole or a medium hole. A positioning plate that can fit against the coal wall is fixedly sleeved on the water injection pipe. The positioning plate is fixedly connected with a plurality of control nodes. The control nodes are electrically connected with a humidity sensor and an indicator light. The humidity sensors are distributed on the periphery of the water injection device and fit against the coal wall. The indicator lights are fixedly arranged on the positioning plate. All the control nodes of the multiple water injection devices are wirelessly networked to form a water injection monitoring network; A water supply device for supplying water to the water injection device. The water supply device includes a water source, a plurality of water supply pipes corresponding to and communicating with the water injection pipes, a plurality of valves for correspondingly controlling the on-off of the water supply pipes, and a water supply controller for controlling all the valves. And the water supply controller is connected to the water injection monitoring network.

[0008] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: The water injection device includes a conical installation cylinder. The small end of the conical installation cylinder is fixedly connected with the positioning plate, and the large end of the conical installation cylinder faces away from the coal wall. The indicator light is fixedly arranged on the inner wall of the conical installation cylinder, and a reflective layer is arranged on the inner wall of the conical installation cylinder.

[0009] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: The control nodes are arranged on the outer wall of the conical installation cylinder and are located between the conical installation cylinder and the coal wall. The control nodes are electrically connected with the humidity sensor through a cable.

[0010] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: The humidity sensor is fixedly connected with an installation component. The installation component includes a substrate. Each of the two relatively arranged edges of the substrate is fixedly connected with an elastic side plate. The elastic side plates are inclined relative to the substrate. A receiving space for receiving the humidity sensor is formed between the two elastic side plates. The substrate and the elastic side plates are both fixedly connected to the coal wall.

[0011] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: The substrate and the elastic side plates are both fixed to the coal wall through a plurality of installation bolts. The substrate is provided with a plurality of first through holes for the installation bolts to pass through, and the elastic side plates are provided with a plurality of second through holes for the installation bolts to pass through.

[0012] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: At least two anchoring components are fixedly arranged on the water injection pipe along the length direction of the water injection pipe. The anchoring component includes a plurality of flexible expansion joints. A filling space is formed between the inner wall of the expansion joint and the water injection pipe. A branch pipe is also fixedly arranged on the pipe wall of the water injection pipe. The branch pipe is communicated with all the filling spaces. Injecting water into the filling spaces through the branch pipe can cause the expansion joints to expand and fit tightly against the hole wall of the deep hole or the medium hole.

[0013] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: in one of the anchoring components, through holes for the water injection pipe to pass through and water adding holes for the branch pipes to pass through are provided at the ends of the two expansion joints located at both ends.

[0014] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: a plurality of friction blocks are fixedly arranged on the outer wall of the expansion joint, and the friction blocks can penetrate into the coal wall after the expansion joint expands.

[0015] As a further optimization of the above-mentioned combined deep and medium hole water injection system for coal seams: a sleeve is fixedly sleeved on one end of the water injection pipe located outside the deep hole or the medium hole, and the sleeve is communicated with an auxiliary pipe, and the auxiliary pipe can draw water from the water supply device and send water to the branch pipe.

[0016] A method for combined deep and medium hole water injection in coal seams, based on the above-mentioned combined deep and medium hole water injection system for coal seams, the method includes the following steps: Determine the deep hole and the medium hole based on the existing drill holes on the coal wall; Set the water injection device, and place the water injection pipe into the deep hole or the medium hole; Use the water supply device to supply water to the water injection device, and use the water injection pipe to inject water into the deep hole or the medium hole; Use the humidity sensor to monitor the dynamic water injection data of the deep hole or the medium hole, and upload the dynamic water injection data to the water supply controller through the water injection monitoring network; The water supply controller controls the valve based on the dynamic water injection data to change the water supply state of the water injection device.

[0017] Beneficial effects: The present invention can use existing drill holes such as gas drainage holes as water injection holes, reduce the number of drill holes and drilling times, and improve the overall efficiency; during the water injection process, it can monitor in real time the situation of water seeping out from the coal wall, and then control the indicator light to turn on, enabling the staff to quickly understand the water injection situation of the deep hole and the medium hole; the present invention can also use the water injection monitoring network to enable the water supply device to control the water supply process according to the actual water injection situation of the water injection device, and then automatically adjust the water injection process, with higher water injection efficiency. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the distribution mode of the humidity sensor relative to the water injection hole; Figure 2 It is a schematic diagram of the structure of the water injection device; Figure 3 It is a schematic diagram of the structure of the expansion joint; Figure 4 It is a schematic diagram of the distribution mode of the indicator light on the conical installation cylinder; Figure 5 It is a schematic diagram of the structure of the installation component.

[0019] Description of the Drawings: 1 - coal wall, 2 - water injection hole, 3 - humidity sensor, 4 - water outlet head, 5 - water injection pipe, 6 - anchoring assembly, 7 - branch pipe, 8 - positioning plate, 9 - positioning screw, 10 - conical installation cylinder, 11 - indicator light, 12 - auxiliary pipe, 13 - connecting flange, 14 - sleeve, 15 - control node, 16 - cable, 17 - expansion joint, 19 - water filling hole, 18 - through hole, 20 - friction block, 21 - substrate, 22 - first through hole, 23 - elastic side plate, 24 - second through hole. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figure 1 and Figure 2 shown, a combined deep and medium hole water injection system for coal seams includes a water supply device and a plurality of water injection devices.

[0022] A plurality of water injection devices, the water injection device includes a water injection pipe 5 that can be inserted into deep holes or medium holes, a positioning plate 8 that is fixedly sleeved on the water injection pipe 5 and can be attached to the coal wall 1, the positioning plate 8 is fixedly connected with a plurality of control nodes 15, the control nodes 15 are electrically connected with a humidity sensor 3 and an indicator light 11, the humidity sensor 3 is distributed on the periphery of the water injection device and attached to the coal wall 1, the indicator light 11 is fixedly arranged on the positioning plate 8, and all the control nodes 15 of the plurality of water injection devices are wirelessly networked to form a water injection monitoring network.

[0023] A water supply device for supplying water to the water injection device, the water supply device includes a water source, a plurality of water supply pipes corresponding to and communicating with the water injection pipe 5, a plurality of valves for correspondingly controlling the on-off of the water supply pipes, and a water supply controller for controlling all the valves, and the water supply controller is connected to the water injection monitoring network, and the water injection pipe 5 is connected to the water supply pipe through a connecting flange 13.

[0024] When conducting combined water injection into deep holes and medium holes in a coal seam, existing boreholes such as gas drainage holes can be used as deep holes or medium holes according to the actual depth, thereby reducing the number of boreholes and the number of drilling operations. The selected deep holes and medium holes can be collectively referred to as water injection holes 2. Subsequently, the water injection device is correspondingly arranged in the deep holes and medium holes. Specifically, the water injection pipe 5 is inserted into the deep hole or medium hole, and the positioning plate 8 is fixed on the coal wall 1. The positioning plate 8 can be used to fix the insertion depth of the water injection pipe 5. At the same time, the humidity sensors 3 are distributed on the periphery of the deep hole or medium hole and attached to the coal wall 1, thus completing the installation of the water injection device. To facilitate the insertion of the water injection pipe 5 into the water injection hole 2, a conical tubular water outlet head 4 can be fixedly connected to the water outlet end of the water injection pipe 5. On the other hand, the mounting plate 8 can be fixed to the coal wall 1 through a plurality of positioning screws 9. Then, the water supply device is simultaneously connected to multiple water injection devices, enabling the water supply device to supply water to multiple water injection devices. After the water supply device and the water injection device are both installed, the water supply device can be used to supply water to the water injection device, and the water injection device injects water into the deep holes and medium holes. During the water injection process, a part of the water will seep out from the coal wall 1 around the deep holes and medium holes. Through the humidity sensor 8, the water seepage situation of the coal wall 1 can be monitored, and the humidity sensor 8 sends the humidity data to the control node 15. When the humidity data of the humidity sensor 8 reaches the preset humidity threshold, the control node 15 controls the indicator light 11 to light up. The staff can quickly judge the water injection situation of the deep hole or medium hole according to the lighting situation of the indicator light 11. Further, the control node 15 can also send the humidity data to the water supply controller based on the water injection monitoring network. The water supply controller can change the water volume and water pressure supplied to the water injection device according to the water injection situation of the deep holes and medium holes, thereby controlling the water injection process.

[0025] It should also be noted that in the present invention, the water source, water supply pipe, and valve are all conventional structures of water supply devices in the art, and their specific structures and working principles will not be elaborated here; the water supply controller can adopt a conventional PLC, and a suitable model can be selected according to actual needs; the control node 15 can adopt a conventional low-power Internet of Things module, and can then perform wireless networking based on technologies such as ZigBee, which are all mature existing technologies and will not be elaborated here.

[0026] The present invention can use existing boreholes such as gas drainage holes as water injection holes, reduce the number of boreholes and the number of drilling operations, and improve the overall efficiency; during the water injection process, it can monitor the situation of water seeping out from the coal wall 1 in real time, and then control the indicator light 11 to light up, enabling the staff to quickly understand the water injection situation of the deep holes and medium holes; the present invention can also utilize the water injection monitoring network to enable the water supply device to control the water supply process according to the actual water injection situation of the water injection device, and then automatically adjust the water injection process, with higher water injection efficiency.

[0027] To facilitate the installation of the indicator light 11 and also facilitate the staff to observe the indicator light 11, the water injection device includes a conical installation cylinder 10. The small end of the conical installation cylinder 10 is fixedly connected to the positioning plate 8, and the large end of the conical installation cylinder 10 faces away from the coal wall 1. The indicator light 11 is fixedly arranged on the inner wall of the conical installation cylinder 10, and a reflective layer is arranged on the inner wall of the conical installation cylinder 10. By providing the conical installation cylinder 10 and arranging a reflective layer on the inner wall of the conical installation cylinder 10, the light emitted by the indicator light 11 can be constrained, preventing a part of the light from being absorbed by the black coal wall 1, so that all the light can be emitted in the direction away from the coal wall 1, facilitating the staff to observe the indicator light 11. The distribution mode of the indicator lights 11 on the conical installation cylinder 10 is as Figure 4 shown. The reflective layer can adopt a conventional reflective coating, which will not be elaborated here.

[0028] Furthermore, the control node 15 can control the indicator light 11 to emit different colors of light according to the humidity data of the humidity sensor 8. For example, when the humidity data is much smaller than the humidity threshold, the control node 15 controls the indicator light 11 to emit red light; when the humidity data is close to the humidity threshold, the control node 15 controls the indicator light 11 to emit yellow light; when the humidity data reaches the humidity threshold, the control node 15 controls the indicator light 11 to emit green light. In this way, the staff can accurately grasp the current water injection situation.

[0029] The specific installation method of the control node 15 is as follows: The control node 15 is arranged on the outer wall of the conical installation cylinder 10 and is located between the conical installation cylinder 10 and the coal wall 1. The control node 15 is electrically connected to the humidity sensor 3 through a cable 16. By arranging the control node 15 between the conical installation cylinder 10 and the coal wall 1, the conical installation cylinder 10 can be used to protect the control node 15 from being damaged by foreign object impacts. That is to say, by providing the conical installation cylinder 10, on the one hand, a reflective layer can be arranged on the inner wall to converge the light emitted by the indicator light 11, and on the other hand, it can cooperate with the coal wall 1 to form an installation space for installing the control node 15, realizing the protection of the control node 15.

[0030] As Figure 5As shown in the figure, the specific installation method of the humidity sensor 3 is as follows: The humidity sensor 3 is fixedly connected with an installation component, and the installation component includes a substrate 21. At two opposite edges of the substrate 21, an elastic side plate 23 is fixedly connected respectively. The elastic side plate 23 is inclined relative to the substrate 21. A receiving space for accommodating the humidity sensor 3 is formed between the two elastic side plates 23. Both the substrate 21 and the elastic side plate 23 are fixedly connected to the coal wall 1. More specifically, both the substrate 21 and the elastic side plate 23 are fixed to the coal wall 1 by a plurality of installation bolts. A plurality of first through holes 22 for the installation bolts to pass through are provided on the substrate 21, and a plurality of second through holes 24 for the installation bolts to pass through are provided on the elastic side plate 23. During installation, first, the humidity sensor 3 is attached to the coal wall 1, and then the elastic side plate 23 and the substrate 21 are fixedly connected to the coal wall 1 by using the installation bolts. The installation bolts can pass through the first through holes 22 and the second through holes 24. During the connection process, the elastic side plate 23 will be deformed by extrusion. After the connection is completed, the elastic return trend of the elastic side plate 23 can generate a thrust on the substrate 21, causing the substrate 21 to squeeze the head of the installation bolt, increasing the friction between the installation bolt and the coal wall 1, improving the stability of the installation bolt, and further improving the stability of the overall installation component and the humidity sensor 3.

[0031] As Figure 3 shown in the figure, in order to ensure that the water injection device can stably inject water into the deep holes and medium holes and avoid falling off during the water injection process, resulting in the interruption of water injection, at least two anchoring components 6 are fixedly arranged on the water injection pipe 5 along the length direction of the water injection pipe 5. The anchoring component 6 includes a plurality of flexible expansion joints 17. A filling space is formed between the inner wall of the expansion joint 17 and the water injection pipe 5. A branch pipe 7 is also fixedly arranged on the pipe wall of the water injection pipe 5. The branch pipe 7 is communicated with all the filling spaces. Injecting water into the filling space through the branch pipe 7 can cause the expansion joint 17 to expand and closely fit with the hole wall of the deep hole or the medium hole. After the water injection pipe 5 is placed into the deep hole or the medium hole, water is conveyed into the expansion joint 17 by using the branch pipe 7, causing the expansion joint 17 to expand and closely fit with the hole wall, so as to fix the water injection pipe 5 in the deep hole or the medium hole by means of friction.

[0032] Furthermore, in one anchoring component 6, through holes 18 for the water injection pipe 5 to pass through and water adding holes 19 for the branch pipe 7 to pass through are provided at the ends of the two expansion joints 17 located at both ends.

[0033] In order to further improve the friction between the expansion joint 17 and the hole wall, and thus further improve the stability of the water injection device, a plurality of friction blocks 20 are fixedly arranged on the outer wall of the expansion joint 17. When the expansion joint 17 expands, the friction blocks 20 can penetrate into the coal wall 1.

[0034] For the convenience of setting the water distribution pipe, a sleeve 14 is fixedly sleeved on one end of the water injection pipe 5 located outside the deep hole or the middle hole. The sleeve 14 is communicated with an auxiliary pipe 12, and the auxiliary pipe 12 can draw water from the water supply device and supply water to the branch pipe 7.

[0035] The present invention also provides a method for combined water injection in deep and middle holes of coal seams. Based on the above-mentioned combined water injection system for deep and middle holes of coal seams, the method includes S1 to S5.

[0036] S1. Determine the deep hole and the middle hole based on the existing drill holes on the coal wall 1.

[0037] S2. Set the water injection device, and place the water injection pipe 5 into the deep hole or the middle hole.

[0038] S3. Use the water supply device to supply water to the water injection device, and use the water injection pipe 5 to inject water into the deep hole or the middle hole.

[0039] S4. Use the humidity sensor 3 to monitor the dynamic data of water injection in the deep hole or the middle hole, and upload the dynamic data of water injection to the water supply controller through the water injection monitoring network.

[0040] S5. The water supply controller controls the valve based on the dynamic data of water injection to change the water supply state of the water injection device.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined water injection system for deep medium holes in coal seams, characterized in that Including: A plurality of water injection devices, each water injection device includes a water injection pipe (5) that can be inserted into a deep hole or a medium hole. A positioning plate (8) that can fit on the coal wall (1) is fixedly sleeved on the water injection pipe (5). The positioning plate (8) is fixedly connected with a plurality of control nodes (15). The control nodes (15) are electrically connected with a humidity sensor (3) and an indicator light (11). The humidity sensors (3) are distributed on the periphery of the water injection device and fit on the coal wall (1). The indicator lights (11) are fixedly arranged on the positioning plate (8). All the control nodes (15) of the plurality of water injection devices are wirelessly networked to form a water injection monitoring network; A water supply device for supplying water to the water injection device. The water supply device includes a water source, a plurality of water supply pipes corresponding to and communicating with the water injection pipes (5), a plurality of valves for correspondingly controlling the on-off of the water supply pipes, and a water supply controller for controlling all the valves. And the water supply controller is connected to the water injection monitoring network.

2. The combined water injection system for deep medium holes in coal seams according to claim 1, characterized in that, The water injection device includes a conical installation cylinder (10). The small end of the conical installation cylinder (10) is fixedly connected to the positioning plate (8), and the large end of the conical installation cylinder (10) faces away from the coal wall (1). The indicator light (11) is fixedly arranged on the inner wall of the conical installation cylinder (10), and a reflective layer is arranged on the inner wall of the conical installation cylinder (10).

3. The combined water injection system for deep medium holes in coal seams according to claim 2, characterized in that, The control node (15) is arranged on the outer wall of the conical installation cylinder (10) and is located between the conical installation cylinder (10) and the coal wall (1). The control node (15) is electrically connected to the humidity sensor (3) through a cable (16).

4. A combined deep and medium-hole water injection system for coal seams according to claim 1, characterized in that, The humidity sensor (3) is fixedly connected with an installation component. The installation component includes a substrate (21). Each of the two relatively arranged edges of the substrate (21) is fixedly connected with an elastic side plate (23). The elastic side plate (23) is inclined relative to the substrate (21). A receiving space for receiving the humidity sensor (3) is formed between the two elastic side plates (23). The substrate (21) and the elastic side plates (23) are both fixedly connected to the coal wall (1).

5. The combined water injection system for deep medium holes in coal seams according to claim 4, characterized in that The substrate (21) and the elastic side plates (23) are both fixed to the coal wall (1) through a plurality of installation bolts. The substrate (21) is provided with a plurality of first through holes (22) for the installation bolts to pass through, and the elastic side plates (23) are provided with a plurality of second through holes (24) for the installation bolts to pass through.

6. The combined water injection system for deep medium holes in coal seams according to claim 1, wherein At least two anchoring components (6) are fixedly arranged on the water injection pipe (5) and are distributed along the length direction of the water injection pipe (5). The anchoring component (6) includes a plurality of flexible expansion joints (17). A filling space is formed between the inner wall of the expansion joint (17) and the water injection pipe (5). A branch pipe (7) is also fixedly arranged on the pipe wall of the water injection pipe (5). The branch pipe (7) is communicated with all the filling spaces. Injecting water into the filling spaces through the branch pipe (7) can cause the expansion joints (17) to expand and fit tightly with the hole wall of the deep hole or the medium hole.

7. The combined water injection system for deep and medium holes in coal seams according to claim 6, characterized in that, In one of the anchoring components (6), through holes (18) for the water injection pipe (5) to pass through and water adding holes (19) for the branch pipe (7) to pass through are opened at the ends of the two expansion joints (17) located at both ends.

8. The combined deep and medium-hole water injection system for coal seams according to claim 6, characterized in that, A plurality of friction blocks (20) are fixedly arranged on the outer wall of the expansion joint (17), and the friction blocks (20) can penetrate into the coal wall (1) after the expansion joint (17) expands.

9. The combined deep and medium-hole water injection system for coal seams according to claim 6, characterized in that, A sleeve (14) is fixedly sleeved on one end of the water injection pipe (5) located outside the deep hole or the middle hole. The sleeve (14) is communicated with an auxiliary pipe (12), and the auxiliary pipe (12) can draw water from the water supply device and supply water to the branch pipe (7).

10. A method for combined water injection in deep medium holes of coal seams, based on a combined water injection system for deep medium holes of coal seams as described in any one of claims 1-9, characterized in that, The method includes the following steps: Determine the deep hole and the middle hole based on the existing drill holes on the coal wall (1); Set the water injection device, and place the water injection pipe (5) into the deep hole or the middle hole; Use the water supply device to supply water to the water injection device, and use the water injection pipe (5) to inject water into the deep hole or the middle hole; Use the humidity sensor (3) to monitor the dynamic water injection data of the deep hole or the middle hole, and upload the dynamic water injection data to the water supply controller through the water injection monitoring network; The water supply controller controls the valve based on the dynamic water injection data to change the water supply state of the water injection device.

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