Mine rock burst and harmful gas comprehensive control system and control method

Abstract

The invention relates to a mine rock burst and harmful gas comprehensive prevention and control system and method.The prevention and control system comprises a liquid preparation box, a sand adding device, a sand mixing device, a fracturing pump and a fracturing pipeline, and the liquid preparation box is used for containing hydrogen sulfide absorption liquid; the sand adding device is used for containing supporting sand; the sand mixing device is used for mixing hydrogen sulfide absorption liquid and supporting sand to form sand-containing suspension; the sand mixing device is provided with a liquid inlet end, a sand inlet end and a mixed liquid outlet end, the liquid inlet end can be communicated with a liquid outlet of the liquid preparation box, the sand inlet end can be communicated with a sand outlet of the sand adding device, the mixed liquid outlet end can be communicated with the inlet end of the fracturing pump, and the outlet end of the fracturing pump can be communicated with the first end of the fracturing pipeline; and the second end of the fracturing pipeline extends into a drilling hole of the stratum. According to the method, the sand-containing suspension formed by the hydrogen sulfide absorption liquid and the supporting sand is injected into the drilling hole, so that the rock burst is controlled, the hydrogen sulfide gas is absorbed, and the control efficiency of the mine rock burst and the hydrogen sulfide gas is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of prevention and control of coal seam rock bursts, and more specifically, to a comprehensive prevention and control system and method for mine rock bursts and harmful gases. Background Art

[0002] At present, coal mining is threatened by various natural disasters, such as rock bursts and harmful gases such as hydrogen sulfide, gas, and carbon monoxide. Among them, a rock burst is a dynamic phenomenon in which the coal (rock) mass around a roadway or working face suddenly and violently breaks due to the instantaneous release of elastic deformation energy, often accompanied by phenomena such as the ejection of coal and rock masses, loud noises, and air waves. During the formation process of coal seams, hydrogen sulfide (H2S) gas is often generated due to the influence of sulfides. Hydrogen sulfide is a colorless and highly toxic acidic gas. Hydrogen sulfide is irritating to the eyes, respiratory system, and nervous system of humans. Exposure to low concentrations may cause eye irritation, headache, cough, and difficulty breathing. Inhaling high concentrations of hydrogen sulfide can cause the exposed person to lose consciousness, stop breathing, and quickly cause death. Therefore, the control of mine rock bursts and mine hydrogen sulfide is of great significance for ensuring the safety of on-site workers and the efficient production of mines.

[0003] In the prior art, hydraulic fracturing is usually used to control rock bursts; and hydrogen sulfide absorption liquid is usually injected into coal seams rich in hydrogen sulfide gas to control hydrogen sulfide gas. It can be seen that the existing mine natural disasters are treated separately and not comprehensively, resulting in low treatment efficiency. Summary of the Invention

[0004] The present invention provides a comprehensive prevention and control system for mine rock bursts and harmful gases to solve the technical problem of low treatment efficiency caused by the separate treatment of mine natural disasters in the prior art.

[0005] The present invention provides a comprehensive prevention and control system for mine rock bursts and harmful gases, including: a liquid mixing tank, a sand adding device, a sand mixing device, a fracturing pump, and a fracturing pipeline. The liquid mixing tank is used to hold hydrogen sulfide absorption liquid; the sand adding device is used to hold proppant; the sand mixing device is used to mix the hydrogen sulfide absorption liquid and the proppant to form a sand-containing suspension. The sand mixing device has a liquid inlet end, a sand inlet end, and a mixed liquid outlet end. The liquid inlet end can be connected to the liquid outlet of the liquid mixing tank, the sand inlet end can be connected to the sand outlet of the sand adding device, the mixed liquid outlet end can be connected to the inlet end of the fracturing pump, the outlet end of the fracturing pump can be connected to the first end of the fracturing pipeline, and the second end of the fracturing pipeline extends into a drilling hole in the formation.

[0006] Optionally, the prevention and control system further includes a pumping pump for pumping the reacted sand-containing suspension and / or harmful gas in the drilling hole;

[0007] A first three-way valve is provided at the first end of the fracturing pipeline. The first three-way valve has a first port, a second port, and a third port. The first end of the fracturing pipeline is connected to the first port, the outlet end of the fracturing pump is connected to the second port, the inlet end of the extraction pump is connected to the third port, the outlet end of the extraction pump is connected to a liquid storage tank and / or a harmful gas destruction device. The liquid storage tank is used for storing the sand-containing suspension after the reaction, and the harmful gas destruction device is used for treating the harmful gas.

[0008] Optionally, the inlet of the harmful gas destruction device is connected to the outlet of the liquid storage tank; or, a second three-way valve is provided at the outlet end of the extraction pump. The second three-way valve has a fourth port, a fifth port, and a sixth port. The outlet end of the extraction pump is connected to the fourth port, the inlet end of the liquid storage tank is connected to the fifth port, and the inlet of the harmful gas destruction device is connected to the sixth port;

[0009] And / or, a gas concentration sensor is provided at the inlet end of the extraction pump for detecting the concentration of harmful gas.

[0010] Optionally, a casing is fixedly installed in the drilling hole, and at least one fracturing hole is provided on the circumferential wall surface of the casing located in the target formation. The sand-containing suspension flows into the cracks of the target formation through the fracturing holes; a sealing structure is provided between the casing and the fracturing pipeline, and the sealing structure is located above the target formation;

[0011] And / or, a flow sensor and a pressure sensor are provided at the outlet end of the fracturing pump. The flow sensor is used for detecting the flow rate of the sand-containing suspension injected into the drilling hole; the pressure sensor is used for detecting the pressure of the target formation;

[0012] And / or, the fracturing pipeline is fixedly installed on the formation surface, and the second end of the fracturing pipeline is close to the bottom end of the drilling hole and is located below the target formation; or, the fracturing pipeline can move relative to the formation surface along the axial direction of the drilling hole to adjust the second end of the fracturing pipeline to be close to the bottom end of the drilling hole and be located below the target formation or away from the bottom end of the drilling hole and be located above the target formation.

[0013] Optionally, the liquid mixing tank includes a chemical addition port, a water inlet pipe, and a stirring assembly. The chemical addition port is used for adding a hydrogen sulfide absorbent into the liquid mixing tank. The water inlet pipe is connected to the liquid mixing tank, and the stirring assembly is used for mixing the hydrogen sulfide absorbent and water.

[0014] Optionally, the end of the water inlet pipe extends into the liquid distribution tank and its end is sealed; the stirring assembly includes a water spray pipe, the water spray pipe is connected to the outer wall surface of the water inlet pipe and communicated with the water inlet pipe, the water spraying direction of the water spray pipe is perpendicular to the axis direction of the water inlet pipe and forms a preset angle with the axis direction of the water spray pipe, and the water spray pipe is configured to: the reaction force generated by the water spraying of the water spray pipe drives the water spray pipe to rotate relative to the liquid distribution tank to stir and mix the hydrogen sulfide absorbent and water.

[0015] Optionally, the water inlet pipe is pivotally connected to the liquid distribution tank, and one end of the water spray pipe is fixedly arranged on the outer peripheral surface of the water inlet pipe;

[0016] Or, the water inlet pipe is fixedly arranged on the liquid distribution tank, a sleeve is pivotally and sealingly connected to the outer wall surface of the water inlet pipe, the water spray pipe is fixedly arranged on the outer wall surface of the sleeve, and the sleeve is respectively communicated with the water inlet pipe and the water spray pipe.

[0017] Optionally, a first water hole is arranged on the circumferential surface of the water inlet pipe, a second water hole is arranged on the circumferential surface of the sleeve, one end of the second water hole is communicated with the first water hole, and the other end is communicated with the water spray pipe.

[0018] Optionally, sealing grooves are arranged on the inner wall surface of the sleeve, there are at least 2 sealing grooves, which are arranged at intervals along the axis direction of the sleeve and are respectively located on both sides of the second water hole; sealing rings are arranged in the sealing grooves, and the inner rings of the sealing rings are fitted with the outer wall surface of the water inlet pipe.

[0019] A comprehensive prevention and control system for mine rock bursts and harmful gases provided by the present invention has at least the following beneficial technical effects: by injecting a sand-containing suspension formed by a hydrogen sulfide absorbent and proppant into the drilling hole, while controlling the rock burst, the hydrogen sulfide gas is absorbed, saving the time for preventing and controlling the rock burst and hydrogen sulfide gas in the mine, that is, improving the prevention and control efficiency of the mine rock burst and hydrogen sulfide gas.

[0020] The present invention also provides a comprehensive prevention and control method for mine rock bursts and harmful gases, which is applied to the above comprehensive prevention and control system for mine rock bursts and harmful gases, and the prevention and control method includes the following steps:

[0021] Preparation before fracturing: Reconnoiter the formation to determine the target formation causing mine rock bursts and rich in hydrogen sulfide gas; construct the drilling hole in the target formation; set a casing in the drilling hole and seal the gap between the casing and the drilling hole; shoot at least 1 fracturing hole on the peripheral wall surface of the casing located in the target formation; extend the fracturing pipeline into the casing and seal the gap between the fracturing pipeline and the casing;

[0022] Liquid preparation: Control the hydrogen sulfide absorption liquid in the liquid preparation tank and the proppant in the proppant adding device to enter the sand mixing device for mixing to obtain the sand-containing suspension liquid.

[0023] Sand-carrying fracturing: Control the inlet end of the fracturing pump to be connected to the mixed liquid outlet end of the sand mixing device and control the outlet end of the fracturing pump to be connected to the fracturing pipeline, so that the sand-containing suspension liquid is pressurized by the fracturing pump and then injected into the casing through the fracturing pipeline, and is injected into the fractures of the target formation through the fracturing holes for fracturing and hydrogen sulfide gas absorption.

[0024] Optionally, after the step of sand-carrying fracturing, the prevention and control method further includes the following steps:

[0025] Fracturing detection and judgment: Detect the extension degree of the fractures in the target formation, and judge that if the extension degree of the fractures in the target formation meets the preset extension degree, stop the sand-carrying fracturing; or, detect the pressure in the fracturing pipeline, and if the pressure is lower than the preset pressure value, stop the sand-carrying fracturing.

[0026] Optionally, after the step of stopping the sand-carrying fracturing, the prevention and control method further includes the following steps:

[0027] Gas-liquid extraction: Control the fracturing pump to be disconnected from the fracturing pipeline, and control the extraction pump to be connected to the fracturing pipeline; extract the reacted sand-containing suspension liquid in the casing into the storage tank, and / or extract the harmful gas in the target formation and treat and discharge it through the harmful gas treatment device.

[0028] Gas concentration detection and judgment: Detect the concentration of harmful gas in the fracturing pipeline; judge that if the concentration of harmful gas is less than the preset harmful gas concentration value, it indicates that the target formation is safe and mining operations can be carried out.

[0029] Since the comprehensive prevention and control method for mine rock bursts and harmful gases provided by the present invention is applied to the comprehensive prevention and control system for mine rock bursts and harmful gases provided above, it has all the beneficial technical effects of the above comprehensive prevention and control system for mine rock bursts and harmful gases, and will not be elaborated here.

[0030] In addition, the comprehensive prevention and control method for mine rock bursts and harmful gases provided by the present invention also has the following beneficial technical effects: A sand-containing suspension is injected into the casing using a fracturing pump. Under high pressure, the fractures in the target formation extend, releasing the stress in the target formation and reducing the rock bursts in the target formation; the sand-containing suspension supports the fractures to prevent them from closing; the proppant can form a pore structure, improving the gas permeability of the target formation and facilitating the escape of harmful gases. Among them, hydrogen sulfide gas in the harmful gases reacts fully with the hydrogen sulfide absorbent in the sand-containing suspension to reduce the concentration of hydrogen sulfide gas in the target formation; therefore, it is possible to control both the rock bursts in the target formation and hydrogen sulfide gas, improving the efficiency of controlling mine disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic structural diagram of a comprehensive prevention and control system for mine rock bursts and harmful gases provided by an embodiment of the present invention Figure 1 ;

[0032] Figure 2 Schematic structural diagram of a comprehensive prevention and control system for mine rock bursts and harmful gases provided by an embodiment of the present invention Figure 2 ;

[0033] Figure 3 is Figure 1 Partial enlarged structural schematic diagram of the circled part C in

[0034] Figure 4 is Figure 3 Cross-sectional structural schematic diagram at B-B in

[0035] Description of reference numerals:

[0036] 10 - liquid mixing tank; 101 - liquid outlet; 102 - chemical addition port; 103 - filter screen; 104 - liquid mixing chamber; 105 - liquid storage chamber; 110 - water inlet pipe; 111 - first water hole; 120 - stirring assembly; 130 - sleeve; 131 - second water hole; 132 - sealing groove; 133 - sealing ring; 140 - water spraying pipe; 141 - spraying hole; 150 - spray head; 20 - sand adding device; 201 - sand outlet; 210 - proppant; 30 - sand mixing device; 301 - liquid inlet end; 302 - sand inlet end; 303 - mixed liquid outlet end; 40 - fracturing pump; 50 - fracturing pipeline; 501 - first three-way valve; 60 - extraction pump; 601 - second three-way valve; 70 - liquid storage tank; 701 - gas outlet; 80 - harmful gas destruction device; 801 - gas inlet; 802 - exhaust port; 90 - drilling hole; 910 - casing; 911 - fracturing hole; 920 - sealing structure; A - target formation. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following describes in detail the specific embodiments of the present invention with reference to the accompanying Figures 1 - 4 drawings.

[0038] In the present invention, terms such as "connection" and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure.

[0039] In the present invention, terms such as "inner", "outer", "upper", and "lower" indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] An embodiment of the present invention provides a comprehensive prevention and control system for mine rock bursts and harmful gases. Referring to the accompanying Figure 1 drawings Figure 2 and

[0041] , the comprehensive prevention and control system for mine rock bursts and harmful gases includes a liquid mixing tank 10, a sand adding device 20, a sand mixing device 30, a fracturing pump 40, and a fracturing pipeline 50. The liquid mixing tank 10 is used to hold the hydrogen sulfide absorption liquid; the sand adding device 20 is used to hold the proppant 210; the sand mixing device 30 is used to mix the hydrogen sulfide absorption liquid and the proppant 210 to form a sand-containing suspension. The sand mixing device 30 has a liquid inlet end 301, a sand inlet end 302, and a mixed liquid outlet end 303. The liquid inlet end 301 can be connected to the liquid outlet 101 of the liquid mixing tank 10, the sand inlet end 302 can be connected to the sand outlet 201 of the sand adding device 20, the mixed liquid outlet end 303 can be connected to the inlet end of the fracturing pump 40, the outlet end of the fracturing pump 40 can be connected to the first end of the fracturing pipeline 50, and the second end of the fracturing pipeline 50 extends into the drilling hole 90 in the formation.

[0042] Compared with the separate treatment of rock bursts and hydrogen sulfide gas in the prior art, the comprehensive prevention and control system for mine rock bursts and harmful gases provided by the embodiments of the present invention realizes the absorption of hydrogen sulfide gas while treating rock bursts by injecting a sand-containing suspension formed by a hydrogen sulfide absorbent and proppant 210 into the drilling hole 90, saving the time for preventing and controlling rock bursts and hydrogen sulfide gas in the mine, that is, improving the prevention and control efficiency of mine rock bursts and hydrogen sulfide gas.

[0043] In the embodiments of the present invention, referring to the attached Figure 1 and Figure 2 , the prevention and control system further includes a drainage pump 60 for pumping the reacted sand-containing suspension and / or harmful gas in the drilling hole 90; wherein, the harmful gas includes hydrogen sulfide, gas, carbon monoxide, etc.; the first end of the fracturing pipeline 50 is provided with a first three-way valve 501, and the first three-way valve 501 has a first port, a second port and a third port. The first end of the fracturing pipeline 50 is connected to the first port, the outlet end of the fracturing pump 40 is connected to the second port, the inlet end of the drainage pump 60 is connected to the third port, and the outlet end of the drainage pump 60 is connected to a liquid storage tank 70 and / or a harmful gas destruction device 80. The liquid storage tank 70 is used for storing the reacted sand-containing suspension, and the harmful gas destruction device 80 is used for treating harmful gas. It should be noted that the harmful gas destruction device 80 can convert harmful gases such as gas or carbon monoxide in the harmful gas into carbon dioxide by combustion and then discharge it through the exhaust port 802. After the sand-containing suspension is successively injected into the cracks in the formation through the fracturing pipeline 50 and the drilling hole 90 and the extension degree of the cracks meets the preset extension degree, it is necessary to pump out the reacted sand-containing suspension in the drilling hole 90. Thus configured, compared with the fracturing pipeline 50 that can only inject liquid into the drilling hole 90, the prevention and control system provided by the embodiments of the present invention realizes that the fracturing pipeline 50 can inject the sand-containing suspension into the drilling hole 90 and can also pump out the sand-containing suspension from the drilling hole 90 through the fracturing pipeline 50, improving the prevention and control efficiency.

[0044] In the embodiments of the present invention, the installation position of the harmful gas destruction device 80 is not limited, specifically as follows: For example, referring to the attached Figure 1 , the air inlet 801 of the harmful gas destruction device 80 is connected to the air outlet end 701 of the liquid storage tank 70; or for another example, referring to the attached Figure 2 , the outlet end of the drainage pump 60 is provided with a second three-way valve 601, and the second three-way valve 601 has a fourth port, a fifth port and a sixth port. The outlet end of the drainage pump 60 is connected to the fourth port, the liquid inlet end 301 of the liquid storage tank 70 is connected to the fifth port, and the air inlet 801 of the harmful gas destruction device 80 is connected to the sixth port.

[0045] In the embodiments of the present invention, referring to the attached Figure 1, the fracturing pipeline 50 can be fixedly arranged on the formation surface or movably connected to the formation surface, specifically as follows:

[0046] For example, the fracturing pipeline 50 is fixedly arranged on the formation surface, and the second end of the fracturing pipeline 50 is close to the bottom end of the drilling hole 90 and is located below the target formation A, where the target formation A is a formation that causes rock bursts and is rich in hydrogen sulfide gas. With such an arrangement, by positioning the second end of the fracturing pipeline 50 below the target formation A, it is possible to inject the sand-containing suspension into the drilling hole 90 and also extract the sand-containing suspension after the reaction in the drilling hole 90, that is, there is no need to remove the fracturing pipeline 50 and install other pipelines in the drilling hole 90. Therefore, this prevention and control system is convenient to use and improves the prevention and control efficiency.

[0047] Also, for example, the fracturing pipeline 50 can move relative to the formation surface along the axial direction of the drilling hole 90 to adjust the second end of the fracturing pipeline 50 to be close to the bottom end of the drilling hole 90 and be located below the target formation A or to be far from the bottom end of the drilling hole 90 and be located above the target formation A, where the target formation A is a formation that causes rock bursts and is rich in hydrogen sulfide gas. In one implementation, a sliding hole is installed on the formation surface, and the fracturing pipeline 50 is slidably connected to the sliding hole, capable of adjusting the distance between the second end of the fracturing pipeline 50 and the bottom end of the drilling hole 90; a locking structure is provided between the fracturing pipeline 50 and the sliding hole for locking the fracturing pipeline 50 in the sliding hole. In another implementation, a driving component is installed on the formation surface, and the driving component is drivingly connected to the fracturing pipeline 50 for driving the fracturing pipeline 50 to move along the axial direction of the drilling hole 90. The driving component can be a motor, an electric push rod or a cylinder. With such an arrangement, the position height of the fracturing pipeline 50 in the drilling hole can be adjusted. When injecting the sand-containing suspension into the drilling hole 90, the second end of the fracturing pipeline 50 can be located above or below the target formation A; when extracting the sand-containing suspension after the reaction in the drilling hole 90, the second end of the fracturing pipeline 50 needs to be located below the target formation A, that is, in the sand-containing suspension; therefore, there is no need to remove the fracturing pipeline 50 and install other pipelines in the drilling hole 90. Therefore, the prevention and control system is convenient to use and improves the prevention and control efficiency.

[0048] In the embodiment of the present invention, a gas concentration sensor is provided at the inlet end of the extraction pump 60 for detecting the concentration of harmful gases. For example, the gas concentration sensor is a gas-sensitive sensor capable of detecting the concentration of one or more gases. For example, it can detect the concentration of at least one of methane, carbon monoxide or hydrogen sulfide. With such an arrangement, the detection of the gas concentration of the target formation A is realized. If the detected gas concentration is within the preset gas concentration range, it indicates that the target formation A is safe and mining operations can be carried out.

[0049] In the embodiment of the present invention, refer to the appendix Figure 3The liquid distribution box 10 includes a dosing port 102, a water inlet pipe 110 and a stirring assembly 120. The dosing port 102 is used to add hydrogen sulfide absorbent to the liquid distribution box 10. The water inlet pipe 110 is connected to the liquid distribution box 10. The stirring assembly 120 is used to mix the hydrogen sulfide absorbent and water. In this way, the stirring assembly 120 can fully mix the hydrogen sulfide absorbent and water to obtain a diluted hydrogen sulfide absorbing liquid.

[0050] In the embodiment of the present invention, the type of the stirring component 120 is not limited, and the specific types are as follows:

[0051] The first type, the stirring assembly 120 includes a driving component, a rotating shaft and an impeller, the rotating shaft is pivotally connected to the liquid distribution box 10 and its lower end extends into the liquid distribution box 10, the impeller is fixedly mounted on the rotating shaft, and the driving component is connected to the rotating shaft in a transmission manner, and is used to drive the rotating shaft to drive the impeller to rotate to stir and mix the hydrogen sulfide absorbent and water. Among them, the driving component can include a hand crank, and can also include a motor, the motor is installed in the liquid distribution box 10, and the rotating shaft is fixed to the motor shaft of the motor; it can also include a motor and a transmission structure, the motor is installed in the liquid distribution box 10, the motor shaft of the motor is connected to the power input end of the transmission structure in a transmission manner, and the power output end of the transmission structure is connected to the rotating shaft in a transmission manner, wherein the transmission structure adopts a gear transmission structure or a belt transmission structure in the prior art, etc., as long as the rotation of the rotating shaft can be realized. In this way, the hydrogen sulfide absorbent and water are stirred and mixed by manual drive or motor drive, so that the two are fully mixed to obtain a diluted and mixed hydrogen sulfide absorbent.

[0052] The second one, see the attached Figure 3 , the end of the water inlet pipe 110 extends into the liquid distribution tank 10 and its end is blocked; the stirring assembly 120 includes a water spray pipe 140, the water spray pipe 140 is connected to the outer wall surface of the water inlet pipe 110 and is connected to the water inlet pipe 110, the water spraying direction of the water spray pipe 140 is perpendicular to the axial direction of the water inlet pipe 110 and is at a preset angle to the axial direction of the water spray pipe 140, and the water spray pipe 140 is configured as follows: the reaction force generated by the water spray pipe 140 spraying drives the water spray pipe 140 to rotate relative to the liquid distribution tank 10 to stir and mix the hydrogen sulfide absorbent and water. In this way, the reaction force generated by the water spray pipe 140 spraying water drives the water spray pipe 140 to rotate, thereby stirring and mixing the hydrogen sulfide absorbent and water, so that the two are fully mixed to obtain the diluted and mixed hydrogen sulfide absorbent, saving costs and reducing energy consumption; on the other hand, the water inlet pipe 110 and the stirring assembly 120 are integrated, which is convenient for installation.

[0053] In the embodiment of the present invention, for the above-mentioned second stirring assembly 120, the water spray pipe 140 rotates relative to the liquid distribution box 10, which can be achieved by the following methods:

[0054] For example, the water inlet pipe 110 is pivotally connected to the liquid distribution tank 10, and one end of the water spray pipe 140 is fixedly provided on the outer peripheral surface of the water inlet pipe 110. With such an arrangement, the reaction force generated by the water spraying of the water spray pipe 140 drives the water spray pipe 140 to drive the water inlet pipe 110 to rotate relative to the liquid distribution tank 10, so as to stir and mix the hydrogen sulfide absorbent and water.

[0055] For another example, referring to the appendix Figure 3 , the water inlet pipe 110 is fixedly provided on the liquid distribution tank 10, a sleeve 130 is pivotally and sealingly connected to the outer wall surface of the water inlet pipe 110, the water spray pipe 140 is fixedly provided on the outer wall surface of the sleeve 130, and the sleeve 130 is respectively communicated with the water inlet pipe 110 and the water spray pipe 140. Specifically, a bearing is provided in the sleeve 130, and the inner ring of the bearing is fitted to the outer wall surface of the water inlet pipe 110. With such an arrangement, the reaction force generated by the water spraying of the water spray pipe 140 drives the water spray pipe 140 to drive the sleeve 130 to rotate relative to the water inlet pipe 110, so as to stir and mix the hydrogen sulfide absorbent and water.

[0056] In the embodiment of the present invention, referring to the appendix Figure 3 and Figure 4 , for the second stirring assembly 120 described above, a first water hole 111 is provided on the circumferential surface of the water inlet pipe 110, a second water hole 131 is provided on the circumferential surface of the sleeve 130, one end of the second water hole 131 is communicated with the first water hole 111, and the other end is communicated with the water spray pipe 140. Among them, the positions of the second water hole 131 and the first water hole 111 correspond to each other, and the shapes of the first water hole 111 and the second water hole 131 are not limited. With such an arrangement, the water in the water inlet pipe 110 is sprayed into the liquid distribution tank 10 through the second sleeve 910 and the water spray pipe 140 in sequence.

[0057] In the embodiment of the present invention, referring to the appendix Figure 3 , a sealing groove 132 is provided on the inner wall surface of the sleeve 130, there are at least 2 sealing grooves 132, which are arranged at intervals along the axial direction of the sleeve 130 and are respectively located on both sides of the second water hole 131; a sealing ring 133 is provided in the sealing groove 132, and the inner ring of the sealing ring 133 is fitted to the outer wall surface of the water inlet pipe 110. With such an arrangement, the water in the water inlet pipe 110 is prevented from flowing out from the mating surface of the water inlet pipe 110 and the second sleeve 910, and the solution in the liquid distribution tank 10 is prevented from entering the second hole.

[0058] In the embodiment of the present invention, referring to the appendix Figure 3 and Figure 4 , the water spray pipe 140 includes at least one group of water spray sub-pipes, each group of water spray sub-pipes is coaxially arranged and symmetrically arranged with respect to the axial direction of the water inlet pipe 110, spray holes 141 are provided on the opposite sides of the water spray sub-pipes, and the water spraying direction of the spray holes 141 is perpendicular to the axial direction of the water inlet pipe 110 and has a preset angle with the axial direction of the water spray pipe 140. With such an arrangement, the reaction force generated by the water spraying is along the tangential direction parallel to the water inlet pipe 110, so as to drive the water spray sub-pipes to rotate.

[0059] In an embodiment of the present invention, the value of the preset angle between the water spraying direction of the spray hole 141 and the axial direction of the water spraying pipe 140 is between 0° and 180°. Preferably, the preset angle between the water spraying direction of the spray hole 141 and the axial direction of the water spraying pipe 140 is 90°.

[0060] In an embodiment of the present invention, the spray hole 141 can be provided on the water spraying sub-pipe or on a connecting member connected to the water spraying sub-pipe. For example, there are multiple spray holes 141, and they are arranged at intervals along the axial direction of the water spraying sub-pipe. Also for example, referring to the attached Figure 4 , a second spray head 150 is provided at the end of the water spraying sub-pipe away from the water inlet pipe 110, and the spray hole 141 is provided on the second spray head 150.

[0061] In an embodiment of the present invention, referring to the attached Figure 3 , the liquid preparation tank 10 is provided with a filter screen 103. The filter screen divides the liquid preparation tank 10 into a liquid preparation chamber 104 and a liquid storage chamber 105. The stirring assembly 120 and the chemical addition port 102 are provided in the liquid preparation chamber 104; the liquid outlet 101 is provided in the liquid storage chamber 105. Among them, the installation method of the filter screen 103 is not limited. For example, a clamping groove is provided in the liquid preparation tank 10, and the filter screen 103 is clamped in the clamping groove.

[0062] In an embodiment of the present invention, referring to the attached Figure 3 , the liquid storage chamber 105 is provided with a backwashing port 106. The backwashing port 106 is used to connect to a pressure pipe in the mine, and the pressure pipe is used to perform backwashing on the filter screen 103.

[0063] In an embodiment of the present invention, referring to the attached Figure 1 , a casing 910 is fixedly installed in the drilling hole 90. At least one fracturing hole 911 is provided on the circumferential wall surface of the casing 910 located in the target formation A. The sand-containing suspension flows into the cracks of the target formation A through the fracturing hole 911; a sealing structure 920 is provided between the casing 910 and the fracturing pipeline 50, and the sealing structure 920 is located above the target formation A. With such a setting, the casing 910 is sleeved in the drilling hole 90 to support the drilling hole 90; by providing the sealing structure 920 between the casing 910 and the fracturing pipeline 50, harmful gases in the target formation A are prevented from leaking.

[0064] In an embodiment of the present invention, a flow sensor and a pressure sensor are provided at the outlet end of the fracturing pump 40. The flow sensor is used to detect the flow rate of the sand-containing suspension injected into the drilling hole 90; the pressure sensor is used to detect the pressure of the target formation A. It should be noted that if the pressure of the target formation A is lower than the preset pressure value, it can indirectly reflect that the crack extension degree meets the preset extension degree.

[0065] An embodiment of the present invention further provides a comprehensive prevention and control method for mine rock bursts and harmful gases, which is applied to a comprehensive prevention and control system for mine rock bursts and harmful gases. Referring to the attached Figure 1, the prevention and control method includes the following steps:

[0066] Preparation before fracturing: Reconnoiter the formation to determine the target formation A that causes mine rock bursts and is rich in hydrogen sulfide gas; Drill a borehole 90 into the target formation A; Install a casing 910 in the borehole 90 and seal the gap between the casing 910 and the borehole 90; Eject at least one fracturing hole 911 on the circumferential wall surface of the casing 910 located in the target formation A; Insert the fracturing pipeline 50 into the casing 910 and seal the gap between the fracturing pipeline 50 and the casing 910;

[0067] Liquid preparation: Control the hydrogen sulfide absorption liquid in the liquid mixing tank 10 and the proppant 210 in the sand adding device 20 to enter the sand mixing device 30 for mixing to obtain a sand-containing suspension;

[0068] Sand-carrying fracturing: Control the inlet end of the fracturing pump 40 to be connected to the mixed liquid outlet end 303 of the sand mixing device 30 and control the outlet end of the fracturing pump 40 to be connected to the fracturing pipeline 50, so that the sand-containing suspension is pressurized by the fracturing pump 40 and then injected into the casing 910 through the fracturing pipeline 50, and is injected into the fractures of the target formation A through the fracturing holes 911 for fracturing and hydrogen sulfide gas absorption.

[0069] An integrated prevention and control method for mine rock bursts and harmful gases provided by an embodiment of the present invention uses a fracturing pump 40 to inject a sand-containing suspension into the casing 910. Under the action of high pressure, the fractures of the target formation A extend, so that the stress of the target formation A is released, reducing the rock burst of the target formation A; The sand-containing suspension supports the fractures to prevent the fractures from closing; The proppant 210 can form a pore structure, improving the gas permeability of the target formation A, which is beneficial to the escape of harmful gases. Among them, the hydrogen sulfide gas in the harmful gases reacts fully with the hydrogen sulfide absorption liquid in the sand-containing suspension to reduce the concentration of hydrogen sulfide gas in the target formation A; Therefore, it is possible to control both the rock burst of the target formation A and the hydrogen sulfide gas, improving the treatment efficiency of mine disasters.

[0070] In an embodiment of the present invention, after the step of sand-carrying fracturing, the prevention and control method further includes the following steps:

[0071] Fracturing detection and judgment: To determine the time to stop sand-carrying fracturing and achieve automatic control of mine rock burst prevention and harmful gas prevention and control. Fracturing detection and judgment can be carried out in various ways, specifically as follows:

[0072] For example, detect the extension degree of the fractures of the target formation A. If the extension degree of the fractures of the target formation A meets the preset extension degree, stop sand-carrying fracturing; Detection methods such as microseismic logging method, combined polarization method of well-to-surface electrical method and activated carbon radon measurement method in the prior art can be used, as long as the detection of the extension degree of the fractures can be achieved.

[0073] For another example, when detecting the pressure in the fracturing pipeline 50, if the pressure is lower than the preset pressure value, the sand-carrying fracturing is stopped.

[0074] In the embodiment of the present invention, after the step of stopping the sand-carrying fracturing, refer to the attached Figure 1 , the prevention and control method further includes the following steps:

[0075] Gas-liquid extraction: Control the fracturing pump 40 to disconnect from the fracturing pipeline 50, and control the extraction pump 60 to connect to the fracturing pipeline 50; Extract the sand-containing suspension after reaction in the casing 910 into the storage tank 70, and / or extract the harmful gas in the target formation A and process and discharge it through the harmful gas treatment device;

[0076] Gas concentration detection and judgment: Detect the concentration of harmful gas in the fracturing pipeline 50; Judge that if the concentration of harmful gas is less than the preset concentration value of harmful gas, it indicates that the target formation A is safe and mining operations can be carried out.

[0077] The comprehensive prevention and control method for mine rock bursts and harmful gases provided by the embodiment of the present invention injects a sand-containing suspension into the casing 910 by controlling the fracturing pump 40 to connect to the fracturing pipeline 50, reduces the rock burst in the target formation A and the absorption of hydrogen sulfide gas, and then controls the extraction pump 60 to connect to the fracturing pipeline 50 to realize the extraction of the sand-containing suspension after reaction in the casing 910 and the extraction of harmful gases in the target formation A; that is, there is no need to remove the fracturing pipeline 50 and then install other pipelines for extraction. Only by installing the fracturing pipeline 50 once, the comprehensive prevention and control of rock bursts, hydrogen sulfide gas and other harmful gas disasters can be realized, saving the single disaster control cost and improving the control efficiency of mine disasters.

[0078] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A comprehensive prevention and control system for mine rock bursts and harmful gases, characterized in that, Comprising: A liquid preparation tank (10), a sand adding device (20), a sand mixing device (30), a fracturing pump (40) and a fracturing pipeline (50). The liquid preparation tank (10) is used to contain a hydrogen sulfide absorption liquid; the sand adding device (20) is used to contain proppant (210); the sand mixing device (30) is used to mix the hydrogen sulfide absorption liquid and the proppant (210) to form a sand-containing suspension; the sand mixing device (30) has a liquid inlet end (301), a sand inlet end (302) and a mixed liquid outlet end (303). The liquid inlet end (301) can be connected to the liquid outlet (101) of the liquid preparation tank (10), the sand inlet end (302) can be connected to the sand outlet (201) of the sand adding device (20), the mixed liquid outlet end (303) can be connected to the inlet end of the fracturing pump (40), the outlet end of the fracturing pump (40) can be connected to the first end of the fracturing pipeline (50), and the second end of the fracturing pipeline (50) extends into a drilling hole (90) of a formation.

2. The comprehensive prevention and control system for mine rock bursts and harmful gases according to claim 1, wherein, The prevention and control system further includes a pumping pump (60) which is used to pump the sand-containing suspension and / or harmful gas after reaction in the drilling hole (90); A first three-way valve (501) is provided at the first end of the fracturing pipeline (50). The first three-way valve (501) has a first port, a second port and a third port. The first end of the fracturing pipeline (50) is connected to the first port, the outlet end of the fracturing pump (40) is connected to the second port, the inlet end of the pumping pump (60) is connected to the third port, and the outlet end of the pumping pump (60) is connected to a liquid storage tank (70) and / or a harmful gas destruction device (80). The liquid storage tank (70) is used to store the sand-containing suspension after reaction, and the harmful gas destruction device (80) is used to treat the harmful gas.

3. The comprehensive prevention and control system for mine rock bursts and harmful gases according to claim 2, characterized in that, The air inlet (801) of the harmful gas destruction device (80) is connected to the air outlet end (701) of the liquid storage tank (70); or, a second three-way valve (601) is provided at the outlet end of the pumping pump (60). The second three-way valve (601) has a fourth port, a fifth port and a sixth port. The outlet end of the pumping pump (60) is connected to the fourth port, the liquid inlet end (301) of the liquid storage tank (70) is connected to the fifth port, and the air inlet (801) of the harmful gas destruction device (80) is connected to the sixth port; And / or, a gas concentration sensor is provided at the inlet end of the pumping pump (60) for detecting the concentration of harmful gas.

4. The comprehensive prevention and control system for mine rock bursts and harmful gases according to any one of claims 1-3, characterized in that, A casing (910) is fixedly arranged in the drilling hole (90). At least one fracturing hole (911) is provided on the peripheral wall surface of the casing (910) located in the target formation (A). The sand-containing suspension flows into the fractures of the target formation (A) through the fracturing hole (911); a sealing structure (920) is provided between the casing (910) and the fracturing pipeline (50), and the sealing structure (920) is located above the target formation (A); And / or, a flow sensor and a pressure sensor are provided at the outlet end of the fracturing pump (40). The flow sensor is used to detect the flow rate of the sand-containing suspension injected into the drilling hole (90); the pressure sensor is used to detect the pressure of the target formation (A). And / or, the fracturing pipeline (50) is fixedly arranged on the formation surface, and the second end of the fracturing pipeline (50) is close to the bottom end of the drilling hole (90) and is located below the target formation (A); or, the fracturing pipeline (50) can move relative to the formation surface along the axial direction of the drilling hole (90) to adjust the second end of the fracturing pipeline (50) to be close to the bottom end of the drilling hole (90) and be located below the target formation (A) or to be far from the bottom end of the drilling hole (90) and be located above the target formation (A).

5. The comprehensive prevention and control system for mine rock bursts and harmful gases according to any one of claims 1-3, characterized in that, The liquid mixing tank (10) includes a chemical addition port (102), a water inlet pipe (110), and a stirring assembly (120). The chemical addition port (102) is used to add a hydrogen sulfide absorbent into the liquid mixing tank (10). The water inlet pipe (110) is connected to the liquid mixing tank (10). The stirring assembly (120) is used to mix the hydrogen sulfide absorbent and water.

6. The comprehensive prevention and control system for mine rock bursts and harmful gases according to claim 5, characterized in that, The end of the water inlet pipe (110) extends into the liquid mixing tank (10) and its end is blocked. The stirring assembly (120) includes a water spraying pipe (140). The water spraying pipe (140) is connected to the outer wall surface of the water inlet pipe (110) and is communicated with the water inlet pipe (110). The water spraying direction of the water spraying pipe (140) is perpendicular to the axial direction of the water inlet pipe (110) and forms a preset angle with the axial direction of the water spraying pipe (140). The water spraying pipe (140) is configured such that the reaction force generated by the water spraying of the water spraying pipe (140) drives the water spraying pipe (140) to rotate relative to the liquid mixing tank (10) to stir and mix the hydrogen sulfide absorbent and water.

7. The comprehensive prevention and control system for mine rock bursts and harmful gases according to claim 6, characterized in that, The water inlet pipe (110) is pivotally connected to the liquid mixing tank (10), and one end of the water spraying pipe (140) is fixedly arranged on the outer peripheral surface of the water inlet pipe (110). Or, the water inlet pipe (110) is fixedly arranged on the liquid mixing tank (10), and a sleeve (130) is sealingly pivotally connected to the outer wall surface of the water inlet pipe (110). The water spraying pipe (140) is fixedly arranged on the outer wall surface of the sleeve (130). The sleeve (130) is respectively communicated with the water inlet pipe (110) and the water spraying pipe (140).

8. The comprehensive prevention and control system for mine rock bursts and harmful gases according to claim 7, characterized in that The circumferential surface of the water inlet pipe (110) is provided with a first water hole (111), and the circumferential surface of the sleeve (130) is provided with a second water hole (131). One end of the second water hole (131) is communicated with the first water hole (111), and the other end is communicated with the water spraying pipe (140).

9. The comprehensive prevention and control system for mine rock bursts and harmful gases according to claim 8, characterized in that, The inner wall surface of the sleeve (130) is provided with sealing grooves (132). There are at least two sealing grooves (132), which are arranged at intervals along the axial direction of the sleeve (130) and are respectively located on both sides of the second water hole (131); a sealing ring (133) is arranged in the sealing groove (132), and the inner ring of the sealing ring (133) is fitted to the outer wall surface of the water inlet pipe (110).

10. A comprehensive prevention and control method for mine rock bursts and harmful gases, characterized in that, Applied to the comprehensive prevention and control system for mine rock bursts and harmful gases according to any one of claims 2-9, the prevention and control method includes the following steps: Preparation before fracturing: Survey the formation to determine the target formation (A) that causes mine rock bursts and is rich in hydrogen sulfide gas; construct the drilling hole (90) in the target formation (A); sleeve a casing (910) in the drilling hole (90) and seal the gap between the casing (910) and the drilling hole (90); shoot at least one fracturing hole (911) on the peripheral wall surface of the casing (910) located in the target formation (A); extend the fracturing pipeline (50) into the casing (910) and seal the gap between the fracturing pipeline (50) and the casing (910); Liquid preparation: Control the hydrogen sulfide absorption liquid in the liquid mixing tank (10) and the proppant (210) in the sand adding device (20) to enter the sand mixing device (30) to be mixed to obtain the sand-containing suspension; Sand-carrying fracturing: Control the inlet end of the fracturing pump (40) to communicate with the mixed liquid outlet end (303) of the sand mixing device (30) and control the outlet end of the fracturing pump (40) to communicate with the fracturing pipeline (50), so that the sand-containing suspension is pressurized by the fracturing pump (40) and then injected into the casing (910) through the fracturing pipeline (50), and is injected into the cracks of the target formation (A) through the fracturing holes (911) for fracturing and hydrogen sulfide gas absorption.

11. The comprehensive prevention and control method for mine rock bursts and harmful gases according to claim 10, characterized in that, After the step of sand-carrying fracturing, the prevention and control method further includes the following steps: Fracturing detection and judgment: Detect the extension degree of the cracks in the target formation (A). If the extension degree of the cracks in the target formation (A) meets the preset extension degree, stop the sand-carrying fracturing; or, detect the pressure in the fracturing pipeline (50). If the pressure is lower than the preset pressure value, stop the sand-carrying fracturing.

12. The comprehensive prevention and control method for mine rock bursts and harmful gases according to claim 11, characterized in that, After the step of stopping the sand-carrying fracturing, the prevention and control method further includes the following steps: Gas-liquid extraction: Control the fracturing pump (40) to be disconnected from the fracturing pipeline (50), and control the extraction pump (60) to be connected to the fracturing pipeline (50); extract the reacted sand-containing suspension in the casing (910) into the storage tank (70), and / or extract the harmful gas in the target formation (A) and treat and discharge it through the harmful gas treatment device; Gas concentration detection and judgment: Detect the concentration of harmful gas in the fracturing pipeline (50); judge that if the concentration of harmful gas is less than the preset harmful gas concentration value, it indicates that the target formation (A) is safe and mining operations can be carried out.

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