Method for improving the wettability of a coal seam

Abstract

The application discloses a method for improving the water injection wettability of a coal seam, which comprises the following steps: setting two or more water tanks, connecting a water inlet and a water outlet to each of the water tanks, connecting the water inlet to a micro-nano bubble generating device, connecting the micro-nano bubble generating device to an external water conveying device, and setting an electromagnetic valve at the water outlet position to control the bubble water discharged from the water tanks in turns, so that the water retention of the coal seam is greatly enhanced and the coal seam is fully wetted. According to the structure of the application, the excess exhaust holes can be automatically closed according to the height of the water level in the water tank, the exhaust holes submerged below the water level are opened, secondary nano bubble generation is carried out, the liquid below the water level is uniformly produced with bubbles by the secondary generation, the opening and closing of the air pipe can be controlled according to the height of the water level, and the exhaust holes above the water level are prevented from being opened to waste gas, so that the resources are further effectively saved.

Description

[0001] This application is a divisional application. The original application has the application number 2021103707298, the application date is April 7, 2021, and the invention title is "A resource-saving device and method for improving the wetting effect of coal seam water injection". Technical Field

[0002] This invention relates to the field of environmental protection equipment, and in particular to a method for improving the wettability of coal seam water injection. Background Technology

[0003] Coal dust is one of the major hazards in coal mining production, seriously threatening the health of workers. Coal seam water injection is the most basic and effective dust control measure in coal mining. By injecting pressurized water into the unmined coal face through boreholes, the coal is pre-wetted, thereby significantly reducing coal dust generation during mining. Furthermore, coal seam water injection can disrupt the original gas-coal system balance within the coal seam, reducing gas concentration and stress concentration, thus preventing rock bursts, lowering coal temperature, and preventing coal spontaneous combustion. The properties of the injected water have a significant impact on the final wetting effect. Currently, in my country, a certain proportion of wetting agent is added to the water to reduce its surface tension and improve its wetting ability and dust suppression effect. This method is complex, difficult to promote and apply, and causes significant environmental pollution. The properties of pressurized water are insufficient, resulting in poor wetting effects from coal seam water injection. To address this problem, this invention provides a method and apparatus for improving the wetting effect of coal seam water injection, based on practical mine engineering considerations.

[0004] Therefore, the existing protection equipment field needs further improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a resource-saving method for improving the wetting effect of coal seam water injection, which can solve the problem of poor wetting effect of current coal seam water injection.

[0006] To achieve the above objectives, the present invention adopts the following solution:

[0007] A resource-saving method for improving the wetting effect of coal seam water injection includes the following step: setting up two or more water tanks, with an inlet and an outlet connected to each water tank; the inlet is connected to a micro-nano bubble generator, and the micro-nano bubble generator is connected to an external water supply device; an electromagnetic valve is installed at the outlet to control the multiple water tanks to discharge bubble water in turn.

[0008] Step 2: The dispersed gas input pipe inputs dispersed gas into multiple diversion pipes to perform secondary nanobubble treatment on the liquid in the water tank. According to the water level in the water tank, the corresponding float rises. After rising, the first hook at the corresponding position is pulled to one side, and the second hook disengages from the first hook. At this time, the second hook unlocks the first hook at the corresponding horizontal level. The internal piston moves upward due to the force of the dispersed gas, causing the diversion pipe below the water level to open for air intake, and perform secondary nanobubble treatment on the liquid in the water tank.

[0009] Step 3: After the liquid has been standing still in the water tank for a period of time, the liquid is injected into the coal seam through the outlet using a pressure pump.

[0010] Furthermore, a float ball is installed inside the water tank. After the float ball rises with the water level, it pushes the piston inside the valve body into the valve body through the connecting rod, so that the float ball valve installed in the water tank can automatically close.

[0011] Furthermore, the micro-nano bubble generator is explosion-proof.

[0012] Furthermore, the outlet is equipped with a check valve, a pressure gauge, and a filter.

[0013] The purpose of this invention is to provide a resource-saving device that improves the wetting effect of coal seam water injection, reduces the ineffective work caused by nanobubbles, and saves resources.

[0014] A resource-saving device for improving the wetting effect of coal seam water injection includes a water tank. A dispersed gas input pipe is connected to the bottom of the water tank. Multiple branch pipes are evenly distributed from top to bottom inside the water tank. The multiple branch pipes are connected to a vertical pipe on one side. The vertical pipe is connected to the dispersed gas input pipe. A piston body is installed inside the vertical pipe to control whether the dispersed gas flows through the multiple branch pipes. The vertical pipe has an opening at the top. A vertical rod is installed in the water tank on one side of the vertical pipe. Multiple horizontal holes are arranged from top to bottom in the vertical rod. A slider is movably installed in each horizontal hole. A first hook is installed outside the vertical pipe. A connecting rod is provided between the first hook and the piston body. A second hook is provided on the side of the slider near the first hook. A first hinge seat is provided on the other side. A vertical shaft seat is provided on the side wall of the vertical rod above the horizontal holes. A vertical shaft is movably installed in the vertical shaft seat. A float plate is provided at the upper end of the vertical shaft. A second hinge seat is provided at the lower end. A connecting rod is hinged between the second hinge seat and the first hinge seat.

[0015] Furthermore, the diversion pipe is provided with multiple diversion holes.

[0016] Furthermore, the number of the horizontal holes is the same as the number of the diversion pipes, and they are arranged horizontally aligned one by one.

[0017] Furthermore, the first hook and the piston body are at the same horizontal position.

[0018] In summary, the advantages of this invention over the prior art are:

[0019] Compared with existing technologies, the beneficial effects of this invention are: it reduces the surface tension of water without adding surfactants, enhances the hygroscopic capacity of dust, and thus effectively improves the wetting effect of coal seam water injection; after treatment by the micro-nano bubble generator, the structure of water molecules becomes smaller, changing from dozens of clusters to a few molecular clusters, greatly increasing the permeability of water, allowing it to penetrate deep into various fissures and pores in the coal body, even filling fissures below 0.1μm, thereby achieving the effect of fully wetting the coal body before mining; due to the strong stability of micro-nano bubbles, they can exist in the coal seam for a long time, equivalent to... A layer of resistant micro-nano bubble water film forms on the surface of the coal seam, greatly enhancing its water retention and ensuring thorough wetting. The structure of this invention automatically closes excess vents based on the water tank level, opening vents submerged below the water level to generate secondary nanobubbles. This secondary generation ensures uniform bubble production in the liquid below the water level. The opening and closing of the gas pipes can be controlled according to the water level, preventing gas waste from vents above the water level, thus further conserving resources. This invention is simple to operate, easy to implement, and low in cost, providing guidance for selecting coal seam water injection methods in practical applications. Furthermore, its simple structure makes it convenient to use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the secondary generator of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0023] Please see Figure 1-2The present invention provides a method for improving the wetting effect of coal seam water injection, including step one: setting up two or more water tanks 1, and connecting water inlet 2 and water outlet 3 to the water tanks 1 respectively; the water inlet 2 is connected to a micro-nano bubble generator 4, and the micro-nano bubble generator 4 is connected to an external water supply device; an electromagnetic valve 5 is set at the water outlet 3 to control the multiple water tanks 1 to discharge bubble water in turn;

[0024] Step 2: Dispersed gas is introduced into multiple diversion pipes 7 through the dispersed gas input pipe 6 to perform secondary nanobubble treatment on the liquid in the water tank 1. According to the water level in the water tank 1, the float 19 at the corresponding position rises. After rising, the first hook 13 at the corresponding position is pulled to one side, and the second hook 15 disengages from the first hook 13. At this time, the second hook 15 unlocks the first hook 13 at the corresponding horizontal height. The internal piston 9 moves upward due to the force of the dispersed gas, causing the diversion pipe 7 below the water level to open the air intake and perform secondary nanobubble treatment on the liquid in the water tank 1.

[0025] Step 3: After the liquid has been stationary in the water tank 1 for a period of time, the outlet 3 injects the liquid into the coal seam through the pressure pump 22.

[0026] Connect the inlet 2 of the mine water supply network and multiple water tanks 1 to the inlet and outlet of the micro-nano bubble generator 4, respectively, and then connect the outlet 3 of the multiple water tanks 1 to the booster pump.

[0027] Turn on the micro / nano bubble generator 4 and wait for the nano bubble water to fill the water tank 1. After being treated by the micro / nano bubble generator 4, the mine water becomes nano bubble water containing a large number of micro / nano bubbles.

[0028] Turn on solenoid valve 5 to supply water to the booster pump. Set the automatic opening and closing time interval of solenoid valve 5 according to the water tank filling and draining time. Ensure that the nano bubble water in water tank 1 is left to stand for several minutes to remove larger bubbles and ensure the wetting effect.

[0029] Open outlet 3 to inject micro-nano bubble water into the coal seam.

[0030] In the above method for improving the wettability of coal seam water injection, the filling time of water tank 1 is:

[0031]

[0032] In the formula: V represents the capacity of water tank 1, and Q1 represents the instantaneous flow rate of water filling water tank 1.

[0033] The water tank will be completely drained in the following time:

[0034]

[0035] In the formula: Q2 represents the instantaneous flow rate of water discharged from water tank 1.

[0036] The time interval for solenoid valve 5 to automatically close is:

[0037] t3 = t2;

[0038] The time interval for solenoid valve 5 to open automatically is:

[0039] t4 = t1 + N;

[0040] In the formula: N represents the required settling time.

[0041] The present invention provides a float ball in the water tank 1. After the float ball rises with the water level, it pushes the piston in the valve body into the valve body through the connecting rod, so that the float valve 100 in the water tank 1 can be automatically closed.

[0042] The micro-nano bubble generator 4 described in this invention is explosion-proof.

[0043] The water outlet 3 of the present invention is equipped with a flow stop valve 23, a pressure gauge 24 and a filter 25.

[0044] When coking coal seam water injection begins, the micro-nano bubble generator 4 is first turned on and connected to the external water network. Ordinary water is treated by the micro-nano bubble generator 4 to produce a large number of micro-nano bubbles, and the resulting bubble water is injected into water tank 1. After water tank 1 is full, the lift generated by the float rising with the water level pushes the piston in the valve body through the connecting rod, causing the float valve 100 to automatically close. After the bubble water has settled for a period of time, the solenoid valve 5 of water tank 1 is opened, and its automatic closing time interval is set to t3, and its automatic opening time interval is set to t4. The micro-nano bubble water flowing out of water tank 1 flows through the filter to remove large particles of impurities, and then the water injection pump and motor are turned on to pressurize it. The pressurized water is injected into the coal seam sequentially through the check valve, the diversion zone, and the water injection pipe. After the water in one water tank 1 is drained, the same operation is performed on the other water tank 1. Afterward, multiple water tanks 1 can automatically alternately supply water to the water injection pump.

[0045] A resource-saving device for improving the wetting effect of coal seam water injection includes a water tank 1. A dispersible gas input pipe 6 is connected to the bottom of the water tank 1. Multiple branch pipes 7 are evenly distributed from top to bottom inside the water tank 1. The multiple branch pipes 7 are connected by a vertical pipe 8 located on one side. The vertical pipe 8 is connected to the dispersible gas input pipe 6. A piston body 9 is installed inside the vertical pipe 8 to control whether the multiple branch pipes 7 are circulated with dispersible gas. The vertical pipe 8 has an opening at the top. A vertical rod 10 is installed inside the water tank 1 on one side of the vertical pipe 8. Multiple horizontal holes 11 are arranged from top to bottom inside the vertical rod 10. A slider 12 is movably disposed within the horizontal hole 11; a first hook 13 is disposed outside the vertical pipe 8, and a connecting rod 14 is disposed between the first hook 13 and the piston body 9; a second hook 15 is disposed on the side of the slider 12 near the first hook 13, and a first hinge seat 16 is disposed on the other side; a vertical shaft seat 17 is disposed on the side wall of the vertical rod 10 above the horizontal hole 11, and a vertical shaft 18 is movably disposed within the vertical shaft seat 17; a float 19 is disposed at the upper end of the vertical shaft 18, and a second hinge seat 20 is disposed at the lower end; a connecting rod 21 is hinged between the second hinge seat 20 and the first hinge seat 16.

[0046] The diversion pipe 7 of the present invention is provided with a plurality of diversion holes 200.

[0047] The number of horizontal holes 11 in this invention is the same as the number of diversion pipes 7, and they are arranged horizontally aligned one by one.

[0048] In this invention, the first hook 13 and the piston body 9 are at the same horizontal position.

[0049] To ensure sufficient air bubbles are incorporated into the water, a dispersion gas input pipe 6 is connected to a dispersion gas input device, which inputs dispersion gas into the water tank 1. Based on the water level in the tank, multiple vertically arranged floats 19 automatically rise. Once a float 19 contacts the liquid and rises, it pulls the corresponding slider 12 via a connecting rod 21. The slider 12 moves to one side, causing the second hook 15 on the other side to disengage from the first hook 13. The first hook 13 unlocks to the desired height, and the piston body 9 automatically rises under the pressure and buoyancy of the gas until it reaches the top where the second hook 15 has not moved. At position 15, the first hook 13 and the second hook 15 restrict the upward movement of the piston body 9. At this time, the corresponding external distribution pipe 7 cannot be connected to the gas, ensuring that the distribution pipe 7 in the liquid can spray out dispersed gas, so that the gas can be fully mixed in the water. When the water level drops, the piston body 9 automatically descends due to gravity. The first hook 13 and the second hook 15 are set as inverted hooks. At this time, the first hook 13 can pass over the second hook 15, and the second hook 15 is pushed back and descended to a suitable position, ensuring that the distribution pipe 7 in the liquid can spray out gas, thus saving resources.

[0050] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method of improving the waterflood injectivity of a coal seam, characterised by: The process includes step one: setting up two or more water tanks (1), with an inlet (2) and an outlet (3) connected to each water tank (1); the inlet (2) is connected to a micro-nano bubble generator (4), and the micro-nano bubble generator (4) is connected to an external water supply device; a solenoid valve (5) is installed at the outlet (3) to control the multiple water tanks (1) to discharge bubble water in turn; Step 2: The dispersed gas input pipe (6) inputs dispersed gas into multiple diversion pipes (7) to perform secondary nano-bubble treatment on the liquid in the water tank (1). According to the water level in the water tank (1), the corresponding float (19) rises. After rising, the first hook (13) at the corresponding position is pulled to one side, and the second hook (15) disengages from the first hook (13). At this time, the second hook (15) unlocks the first hook (13) at the corresponding horizontal height. The internal piston (9) moves upward due to the force of the dispersed gas, so that the diversion pipe (7) below the water level opens the air intake to perform secondary nano-bubble treatment on the liquid in the water tank (1). Step 3: After the liquid has been stationary in the water tank (1) for a period of time, the outlet (3) injects the liquid into the coal seam through the pressure pump (22); Connect the inlet (2) of the mine water supply network and multiple water tanks (1) to the inlet and outlet of the micro-nano bubble generator (4) respectively, and then connect the outlet (3) of the multiple water tanks (1) to the booster pump respectively. Turn on the micro-nano bubble generator (4) and wait for the nano bubble water to fill the water tank (1); Turn on the solenoid valve (5) to supply water to the booster pump. Set the time interval for the automatic opening and closing of the solenoid valve (5) according to the water filling and draining time of the water tank. Ensure that the nano bubble water in the water tank (1) is left to stand for several minutes to remove larger bubbles and ensure the wetting effect. Open the outlet (3) and inject micro-nano bubble water into the coal seam; The water tank (1) is filled in the following time: ; In the formula: represents the volume of the water tank (1), represents the instantaneous flow rate of water filling in the water tank (1); The time required for water tank (1) to be completely drained is: ; In the formula: represents the instantaneous flow rate of the water discharged from the water tank (1); The time interval for the solenoid valve (5) to automatically close is: ； The time interval for the solenoid valve (5) to automatically open is: ； In the formulae: represents the desired standing time; Wherein, t1, t2, t3, t4, The unit is s; The unit is m 3 ; , The unit is m 3 / s.

2. The method for improving the water injection wettability of a coal seam according to claim 1, characterized in that: A float ball is installed in the water tank (1). After the float ball rises with the water level, it pushes the piston in the valve body into the valve body through the connecting rod, so that the float valve (100) installed in the water tank (1) can be automatically closed.

3. The method of improving the waterflood injectivity of a coal seam according to claim 1, wherein: The micro-nano bubble generator (4) is explosion-proof.

4. The method for improving the wettability of coal seams by water injection according to claim 1, characterized in that: The outlet (3) is equipped with a check valve (23), a pressure gauge (24) and a filter (25).

Images