Method for reusing water in high-pressure water-rich aquifer of coal seam roof

Abstract

The application discloses a method for recycling water in a high-pressure water-rich aquifer in a coal seam roof, which comprises the following steps: drilling a long-distance directional aquifer drainage borehole in a mine to guide water in the high-pressure water-rich aquifer in the coal seam roof to a water turbine arranged in a chamber, absorbing hydraulic potential energy by using the water turbine, reducing the impact damage of the high-pressure water directly drained to a roadway floor, reducing the risk of high-pressure water splashing to hurt people, driving the water turbine to generate electricity by using the hydraulic potential energy, and using the generated electricity to supplement drainage power or provide underground lighting power, so that the hydraulic potential energy is fully utilized, and the purpose of changing harm into benefit is achieved. After the water flow is generated, the water flow directly enters a water sump and is directly discharged to the ground, the water flow does not pass through a roadway of a working face, dispersion of water flow in conventional short drilling is avoided, the water flow becomes sewage after passing through the working face mixed with coal slime, clean water is not easy to damage drainage equipment, and ground water treatment is relatively easy.

Description

Technical Field

[0001] This invention belongs to the technical field of water conveyance methods during coal seam mining, specifically relating to a method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams. Background Technology

[0002] To ensure the safe mining of the lower coal seam, it is often necessary to drill water drainage boreholes in the roof aquifer before mining to drain and depressurize the upper sandstone aquifer. Some mines have thick sandstone aquifers on the roof of the coal seam with abundant water supply, high water pressure, and strong water-bearing capacity, possessing significant hydraulic potential energy.

[0003] In the past, when draining water from roof aquifers, the water flow was typically achieved by drilling through conventional short boreholes into the sandstone aquifer, then directly draining the water along the boreholes to the tunnel floor. The water then collected along the tunnel floor and was discharged to the surface through the mine drainage system. While this method effectively drained the sandstone aquifer, the high-pressure water exerted a strong impact on the tunnel floor, easily causing damage. The water also carried coal slurry and dust along the tunnel floor, becoming coal slurry water, which tended to accumulate in the water tank and could damage drainage equipment. Furthermore, the splashing water posed a safety threat to underground workers. The hydraulic potential energy of the aquifer was not effectively utilized during the drainage process, and the underground drainage pumps required electricity. Since coal mines primarily use thermal power, the drainage process resulted in a certain amount of carbon emissions. Therefore, a hydroelectric power generation chamber is designed near the working face to generate electricity using the hydraulic potential energy of the aquifer in the coal seam roof. This electricity is then used for underground drainage, achieving separation of clean and contaminated water in underground drainage, eliminating the impact of high-pressure water from the roof on the roadways and the safety threats to workers, while also fully utilizing hydroelectric resources. Furthermore, using electricity generated from the roof aquifer for drainage can reduce the use of thermal power, thus contributing to carbon reduction in the production process to some extent. Summary of the Invention

[0004] The purpose of this invention is to provide a method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams, which solves the problem that the hydraulic potential energy of existing aquifers is not effectively utilized during the drainage process.

[0005] The technical solution adopted in this invention is: a method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams. This involves drilling long-distance directional aquifer drainage holes underground to divert water from the high-pressure, water-rich aquifers in the roof to a hydraulic generator installed in the tunnel. The hydraulic generator absorbs hydraulic potential energy, reducing the impact damage to the tunnel floor caused by direct drainage of high-pressure water and reducing the risk of injury from high-pressure water splashing. At the same time, the hydraulic potential energy drives the hydraulic generator to generate electricity, which is used to supplement drainage power or provide underground lighting power, thereby making full use of hydraulic potential energy.

[0006] The invention is further characterized in that,

[0007] The specific operational steps for reusing water from high-pressure, water-rich aquifers in the roof of coal seams are as follows:

[0008] Step 1: Construct an uphill slope on the side of the drainage working face, construct a drainage drilling rig chamber inside the coal seam roof, and arrange a long-distance directional drilling rig inside the drilling rig chamber;

[0009] Step 2: The long-distance directional drilling rig drills a hole in the rock strata of the drainage drilling rig chamber and installs a hole casing. A tee with a double gate valve is connected to the outside of the hole casing. A high-pressure water pipe is installed at one end of the tee, and the other end of the high-pressure water pipe is connected to the water inlet of the hydroelectric generator.

[0010] Step 3: After the long-distance directional drilling rig passes through the overlying rock layer and enters the sandstone aquifer by using the uphill slope, parallel branch boreholes are drilled at intervals of 30-40m on the sandstone aquifer plane so that the water from each branch borehole flows out through the same main borehole section, converges and flows through the borehole casing and high-pressure water pipe before entering the hydroelectric generator.

[0011] Step 4: The hydroelectric generator generates electricity by supplying water through a high-pressure water pipe. A lower water tank is installed at the bottom of the hydroelectric generator. The outlet of the hydroelectric generator is connected to the lower water tank, and the water flowing through the hydroelectric generator directly enters the lower water tank.

[0012] Step 5: Connect the electricity generated by the hydroelectric generator and the external power source to the small transformer in the well via wires. After voltage regulation, the small transformer in the well is connected to the water pump to provide power for the water pump to drain water.

[0013] Step 6: Connect a drain pipe and a drain pump to the outside of the lower water tank. The other end of the drain pipe is connected to the bottom of the well tower through the well shaft, and then connected to the ground water treatment workshop from the bottom of the well tower to drain the lower water tank.

[0014] The electricity generated by the hydroelectric generator can also be used for underground lighting.

[0015] Water from the sandstone aquifer in the roof flows through a high-pressure water pipe to a hydroelectric generator, which then drives the generator to produce electricity.

[0016] When the water in the aquifer is drained to the point where the pressure decreases and the power output of the hydroelectric generator is insufficient to drive the generator to produce electricity, an external power source is used to drain the water.

[0017] The small transformer is installed next to the hydroelectric generator, with one end connected to the external power source and the other end connected to the power line of the hydroelectric generator.

[0018] The water pump is connected to a small transformer underground via the transformer's output power line.

[0019] A gate valve for the water inlet of the hydroelectric generator is installed at the water inlet of the hydroelectric generator.

[0020] The electricity generated by the hydroelectric generator is fed into a small transformer underground via the generator's power lines. The small transformer is used for voltage regulation.

[0021] The beneficial effects of this invention are:

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] (1) The water quality of the sandstone aquifer in the roof is good. Parallel branch boreholes are constructed in the sandstone aquifer in the roof of the coal seam through long-distance directional drilling to collect the drainage water from the sandstone in the roof. After passing through the hydroelectric generator, the water is directly discharged into the water tank and discharged to the ground. The water flow does not pass through the working face roadway, which avoids the dispersion of water flow in conventional short drilling drainage. After flowing through the working face mixed with coal slime, it becomes sewage. This realizes the separation of clean and dirty water in the working face. Moreover, the clean water is not easy to damage the drainage equipment, and the surface water treatment is relatively easy.

[0024] (2) By utilizing the high pressure and rich water characteristics of the sandstone aquifer in the roof, the hydroelectric generator is driven to rotate, which effectively absorbs the impact force of the sandstone water in the roof and avoids the risk of high pressure water flow impacting the tunnel and splashing and injuring people.

[0025] (3) The water in the high-pressure water-rich aquifer of the sandstone roof has a large hydraulic potential energy and can be regarded as a kind of clean energy. Directly releasing it into the roadway will cause energy waste. Utilizing it for hydropower generation can save energy and reduce emissions, and realize the full utilization of resources.

[0026] (4) The generator equipment and related equipment are small and flexible, easy to move, and can be moved and arranged along with the mining activities of the working face, with a wide range of applications. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the spatial arrangement structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the connection structure between the orifice sleeve and the high-pressure water pipe of the present invention;

[0029] Figure 3 This is a schematic diagram of the connection structure between the small underground transformer and the water pump of the present invention;

[0030] Figure 4 This is a schematic diagram of the connection structure between the hydroelectric generator and the high-pressure water pipe of the present invention.

[0031] In the diagram, 1-Drilling rig chamber; 2-Long-distance directional drilling rig; 3-Borehead casing; 4-Tee with double gate valve; 5-High-pressure water pipe; 6-High-pressure water pipe stirrup; 7-Hydraulic generator inlet gate valve; 8-Hydraulic generator; 9-Hydraulic generator power cable; 10-Hydraulic generator outlet; 11-Underground external power supply; 12-Underground small transformer; 13-Drainage pipe; 14-Water pump; 15-Transformer output power line; 16-Lower water tank; 17-Sandstone aquifer; 18-Directional drilling trajectory; 19-Wellbore; 20-Well tower; 21-Surface water treatment workshop. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] Example 1

[0034] This invention relates to a method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams. This involves constructing long-distance directional aquifer drainage boreholes underground to divert water from the high-pressure, water-rich aquifer in the roof to a hydraulic generator installed within the tunnel. The hydraulic generator absorbs hydraulic potential energy, reducing the impact damage to the tunnel floor caused by direct high-pressure water drainage and minimizing the risk of injury from high-pressure water splash. Simultaneously, the hydraulic potential energy drives the hydraulic generator to generate electricity, which is then used to supplement drainage power or provide underground lighting, thus fully utilizing the hydraulic potential energy.

[0035] Example 2

[0036] This invention relates to a method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams, such as... Figure 1-4 As shown, the specific operation steps are as follows:

[0037] Step 1: Construct an uphill slope on the side of the drainage working face, construct a drainage drilling chamber 1 inside the coal seam roof, and arrange a long-distance directional drilling rig 2 inside the drilling chamber 1; the constructed uphill slope is used to transport the long-distance directional drilling rig 2 to the top rock strata of the coal seam.

[0038] Step 2: Drill a hole in the rock stratum of the drainage drilling machine chamber of the long-distance directional drilling rig 2 and install a hole opening sleeve 3. The hole opening sleeve 3 is connected to a tee 4 with a double gate valve. A high-pressure water pipe 5 is installed at one end of the tee. The other end of the high-pressure water pipe 5 is connected to the water inlet of the hydraulic generator.

[0039] Step 3: After the long-distance directional drilling rig 2 penetrates the overlying rock layer and enters the sandstone aquifer 17, parallel branch boreholes are drilled at intervals of 30-40m on the plane of the sandstone aquifer so that the water from each branch borehole flows out through the same main borehole section, converges and flows through the borehole casing 3 and high-pressure water pipe 5 before entering the hydroelectric generator 8.

[0040] Step 4: The hydroelectric generator 8 generates electricity by receiving water through the high-pressure water pipe 5. A lower water tank 16 is installed at the bottom of the hydroelectric generator 8. The outlet 10 of the hydroelectric generator is connected to the lower water tank 16, and the water flowing through the hydroelectric generator directly enters the lower water tank 16.

[0041] Step 5: Connect the power generated by the hydroelectric generator 8 and the external power source to the underground small transformer 12 through wires. After voltage regulation, the underground small transformer 12 is connected to the water pump 14 to provide power for the water pump 14 to drain water.

[0042] Step 6: Connect a drain pipe 13 and a drain pump to the outside of the lower water tank 16. The other end of the drain pipe 13 is connected to the bottom of the well tower 20 through the well shaft 19, and then connected to the ground water treatment workshop 21 from the bottom of the well tower 20 to discharge the lower water tank.

[0043] The electricity generated by the hydroelectric generator can also be used for underground lighting.

[0044] Water from the sandstone aquifer in the roof flows through high-pressure water pipe 5 to the hydroelectric generator 8, which in turn drives the hydroelectric generator 8 to generate electricity.

[0045] When the water in the aquifer is drained to the point where the pressure decreases and the power output of the hydroelectric generator is insufficient to drive the generator to produce electricity, an external power source is used to drain the water.

[0046] The small underground transformer 12 is installed next to the hydroelectric generator 8, with one end connected to the external underground power supply 11 and the other end connected to the hydroelectric generator wire 9.

[0047] The water pump 14 is connected to the small underground transformer 12 via the transformer output power line 15.

[0048] A gate valve 7 for the water inlet of the hydroelectric generator is installed at the water inlet of the hydroelectric generator.

[0049] The electricity generated by the hydroelectric generator 8 is input to the underground small transformer 12 through the hydroelectric generator wire 9. The underground small transformer 12 is used for voltage regulation.

[0050] Example 3

[0051] (1) Construct the uphill slope on the side of the drainage working face, enter the top rock layer of the coal seam from the uphill slope, and then excavate the drilling rig chamber 1 in the space of the lower generator chamber and other spaces on the plane, and move the long-distance directional drilling rig 2 into the drilling rig chamber 1.

[0052] (2) Fix the hydroelectric generator 8 on the bottom plate of the drainage working surface; construct the lower water tank 16 at the lower rear of the hydroelectric generator 8, and connect the water outlet 10 of the hydroelectric generator to the lower water tank 16.

[0053] (3) Fix the water pump 14 next to the lower water tank 16, connect the drain pipe 13 to the bottom outlet of the lower water tank 16, and connect the other end to the bottom of the well tower 20 through the well cylinder 19, and then connect the well tower 20 to the ground water treatment workshop 21 from the bottom of the well tower 20.

[0054] (4) Install the small underground transformer 12 next to the hydro generator 8, with one end connected to the underground external power supply 11 and the other end connected to the hydro generator wire 9;

[0055] (5) Connect the transformer output power line 15 to the water pump 14;

[0056] (6) Fix the long-distance directional drilling rig 2 according to the design orientation, after drilling a hole in the rock stratum, lower the hole casing 3, fix the casing and inspect the quality of the casing.

[0057] (7) Install a tee 4 with a double gate valve on the orifice sleeve 3; connect the outlet of the tee with the double gate valve and the inlet of the hydroelectric generator with a high-pressure water pipe 5, and reinforce the connection of the interface of the high-pressure water pipe 5 with a high-pressure water pipe hoop 6.

[0058] (8) Start the drilling rig and drill along the set directional drilling trajectory 18 in the sandstone aquifer 17 of the coal seam roof. Stop drilling when you reach the design position, retreat to the main hole, and construct branch holes at a plane spacing of about 30-40m until the entire working face mining influence range is covered. After the construction is completed, remove the drill rod.

[0059] (9) After all the drill rods are withdrawn, close the gate valve at one end of the drill rod in the tee 4 with double gate valves, so that the drainage water from the top sandstone flows from the other outlet of the tee through the high-pressure water pipe 5 to the hydroelectric generator 8.

[0060] (10) The high-pressure water released from the borehole drives the hydraulic generator 8 to work, and the water flowing through the hydraulic generator 8 flows from the hydraulic generator outlet 10 to the lower water tank 16.

[0061] (11) The power generated by the hydroelectric generator 8 is input to the underground small transformer 12 through the hydroelectric generator wire 9, and after being regulated by the underground small transformer 12, it is output to the water pump 14 to drive its operation.

[0062] (12) When the power generated by the hydro generator 8 is weak and insufficient to drive the water pump 14, the external power supply 11 in the well is connected to drive the water pump 14. The power generated by the hydro generator 8 and the external power supply 11 in the well work together to drive the water pump 14.

[0063] (12) The water pump 14 runs continuously, and the water drained from the top sandstone in the lower water tank 16 is discharged to the ground water treatment workshop 21 through the drainage pipe 13.

[0064] (13) When the water pressure of the top sandstone aquifer 17 decreases due to long-term drainage and is insufficient to drive the hydroelectric generator 8, the water pump is driven by the underground external power source 11 to discharge the residual water.

[0065] (14) Continue to drain water until the sandstone aquifer is drained, then transfer the entire set of equipment to the next drainage working face and repeat the above steps.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams, characterized in that, By drilling long-distance directional aquifer drainage boreholes underground, water from the highly pressurized and water-rich aquifer in the roof is diverted to a hydraulic generator installed inside the tunnel. The hydraulic generator absorbs the hydraulic potential energy, reducing the impact damage to the tunnel floor caused by direct high-pressure water drainage. Simultaneously, the hydraulic potential energy drives the generator to produce electricity, which is used to supplement drainage power or provide underground lighting, thus fully utilizing the hydraulic potential energy. The specific operating steps are as follows: Step 1: Construct an uphill slope on the side of the drainage working face, and construct a drainage drilling rig chamber (1) inside the coal seam roof. The uphill slope is used to transport the long-distance directional drilling rig to the top rock strata of the coal seam; arrange the long-distance directional drilling rig (2) inside the drilling rig chamber (1). Step 2: The long-distance directional drilling rig (2) drills a hole in the rock stratum of the drainage drilling rig chamber and installs a hole casing (3). The hole casing (3) is connected to a tee (4) with a double gate valve. A high-pressure water pipe (5) is installed at the branch end of the tee. The other end of the high-pressure water pipe (5) is connected to the water inlet of the hydroelectric generator. Step 3: Using the uphill slope, the long-distance directional drilling rig (2) passes through the overlying rock layer and enters the sandstone aquifer (17) on the roof of the coal seam. Parallel branch boreholes are drilled at intervals of 30m on the sandstone aquifer plane so that the water from each branch borehole flows out through the same main borehole section and flows through the borehole casing (3) and high-pressure water pipe (5) before entering the hydroelectric generator (8). Step 4: The hydroelectric generator (8) generates electricity by supplying water through the high-pressure water pipe (5). A lower water tank (16) is set at the bottom of the hydroelectric generator (8). The outlet (10) of the hydroelectric generator is connected to the lower water tank (16). The water flowing through the hydroelectric generator directly enters the lower water tank (16). Water from the sandstone aquifer at the top of the slab flows through a high-pressure water pipe (5) to a hydroelectric generator (8), which drives the hydroelectric generator (8) to generate electricity. When the water in the aquifer is drained to the point where the pressure decreases and the output power of the hydroelectric generator is insufficient to drive the generator to generate electricity, an external power source is used to drain the water. Step 5: Connect the power generated by the hydroelectric generator (8) and the external power source to the underground small transformer (12) through wires. After voltage regulation, the underground small transformer (12) is connected to the water pump (14) to provide power for the water pump (14) to drain water. The power generated by the hydroelectric generator (8) is input to the underground small transformer (12) through the hydroelectric generator wire (9), and the underground small transformer (12) is used for voltage regulation; Step 6: Connect a drain pipe (13) and a drain pump to the outside of the lower water tank (16). The other end of the drain pipe (13) is connected to the bottom of the well tower (20) through the well cylinder (19), and then connected to the ground water treatment workshop (21) from the bottom of the well tower (20) to drain the water from the lower water tank.

2. The method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams according to claim 1, characterized in that, The electricity generated by the hydroelectric generator can also be used for underground lighting.

3. The method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams according to claim 1, characterized in that, The hydroelectric generator (8) is installed on the drainage working face.

4. The method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams according to claim 1, characterized in that, The underground small transformer (12) is installed next to the hydro generator (8), with one end connected to the underground external power supply (11) and the other end connected to the hydro generator wire (9).

5. The method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams according to claim 1, characterized in that, The water pump (14) is connected to the small transformer (12) in the well via the transformer output power line (15).

6. The method for reusing water from high-pressure, water-rich aquifers in the roof of coal seams according to claim 1, characterized in that, A gate valve (7) for the water inlet of the hydroelectric generator is installed at the water inlet of the hydroelectric generator.

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