Device for preventing and treating coal spontaneous combustion and gas symbiosis disasters

Abstract

The utility model discloses a device for preventing and treating coal spontaneous combustion and gas symbiosis disasters, which is characterized in that a pneumatic booster pump is matched with a proportioning valve, so that high-pressure nitrogen accurately controls slurry flow, and the amount of a grouting material required is determined according to the porosity of a goaf, so that the slurry is pushed to flow and nitrogen is injected into the goaf, and the coal spontaneous combustion and gas symbiosis disasters are prevented. The accuracy of the slurry dosage and the safety in the grouting process are improved; in addition, the casing pipe and the grouting pipe are used in a combined mode, the monitoring result is fed back through the environment monitoring device and the gas analyzer, and the casing pipe can move, so that the grouting range can be adjusted more flexibly according to the conditions of cracks of different depths of a drill hole; the environment monitoring device and the gas analyzer can realize full-path real-time monitoring on the temperature, different gas concentrations and pressures in the early stage and later stage of grouting and in the grouting process, and timely feed back the data abnormal condition of the required position; and the safety in the underground operation process and the accuracy and effectiveness in the grouting process are improved to a great extent.

Description

Technical Field

[0001] The utility model relates to a device for preventing and controlling the co - occurrence disasters of coal spontaneous combustion and gas, belonging to the technical field of coal mine disaster prevention and control. Background Technique

[0002] Coal is an important fossil fuel. The co - occurrence of underground coal mine gas and coal spontaneous combustion has become a common law for major and extremely serious accidents in mines, greatly affecting the stable and healthy operation of coal mining enterprises and also restricting the development of the coal industry.

[0003] Based on the main characteristics of the composite disaster of goaf gas and coal spontaneous combustion, which are concealment, coupling, dynamics, and complexity, the disaster shows the characteristics of high risk, difficult identification, difficult early warning, and difficult prevention and control. Therefore, in the treatment of the co - occurrence disaster, not only the high efficiency of treatment needs to be considered, but also the safety during the treatment process must be taken into account. To efficiently prevent and control the composite disaster of coal spontaneous combustion and gas in the goaf, relevant scholars at home and abroad have carried out collaborative prevention and control from aspects such as controlling oxygen, gas, temperature, and time. For example, the patent with publication number CN212301385U proposes a device for detecting the influence of coal spontaneous combustion heat and gas production characteristics on the gas concentration field, which studies the influence law of heat and gas production on the gas field and provides some theoretical references for gas prevention and control. The patent with publication number CN114517707A proposes a comprehensive prevention and control model of liquid CO2 for coal spontaneous combustion and gas disasters in coal mines. It uses one medium to effectively prevent and control the two disasters, breaking through the traditional model of separately preventing and controlling the two disasters before, shortening the CO2 transportation time, and improving the prevention and control efficiency of the two disasters. The patent with publication number CN207740035U proposes a device for locking the gas drainage pipeline to prevent the spontaneous combustion of residual coal in the goaf. This device ensures the ventilation section and drainage effect at the upper outlet, reduces the possibility of the pipeline being squeezed, and improves safety. The above patents have put forward good research methods in the treatment mode and evolution law of the co - occurrence disasters of coal spontaneous combustion and gas, but there are still few devices that actually consider the physical fields such as the oxygen field, gas field, temperature field, and fracture field in the actual treatment of the co - occurrence disaster.

[0004] Therefore, when actually treating the co - occurrence disaster of coal and gas, it is necessary to deeply apply various theoretical methods, numerical simulation systems, evaluation and other research methods, and at the same time, it is necessary to consider the multi - field coupling mechanism of the co - occurrence disaster. Finally, applying the theoretical method to the actual scenario of preventing and controlling the co - occurrence disaster has become an important topic in disaster prevention and control during the safe coal mining process. Therefore, how to provide a new device that can prevent and control the co - occurrence disasters of coal spontaneous combustion and gas is the research direction required by this application. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a device for preventing and controlling the co-occurring disasters of coal spontaneous combustion and gas. By combining grouting to seal fissures and injecting nitrogen to prevent coal spontaneous combustion, the device can prevent and control the co-occurring disasters of coal spontaneous combustion and gas in the goaf, ensuring the safe mining of subsequent coal mines.

[0006] To achieve the above object, the technical solution adopted by the utility model is as follows: A device for preventing and controlling the co-occurring disasters of coal spontaneous combustion and gas includes an integrated drilling and grouting mechanism, a data monitoring device, a gas booster pump, a slurry storage device, a gas storage device, and a control console;

[0007] The integrated drilling and grouting mechanism includes a grouting monitoring main pipe, a drilling mechanism, a casing, and a grouting pipe. The drilling mechanism is installed outside the grouting monitoring main pipe and is used for drilling into the coal seam; the inner wall of the grouting monitoring main pipe is provided with internal threads, the casing is installed inside the grouting monitoring main pipe, and a slider is installed on the outside of the casing. The surface of the slider is provided with external threads. Rotating the casing makes the casing slide along the axial direction of the grouting monitoring main pipe through the cooperation of the internal and external threads and makes one end of the casing extend out of the grouting monitoring main pipe into the drilling; the grouting pipe is installed inside the casing and is used for grouting into the drilling.

[0008] The slurry storage device includes two slurry storage containers and a slurry mixing pipe. Both upper parts of the two slurry storage containers 10 are provided with air inlets, feeding ports, and pressure detectors. The feeding ports are used for putting slurry raw materials into the slurry storage containers; the pressure detectors are used for monitoring the air pressure in the slurry storage containers; liquid level gauges are installed at the lower parts of the two slurry storage containers for monitoring the amount of raw materials inside; the air outlet end of the gas booster pump is connected to the air inlets of the two slurry storage containers through a gas transmission main pipe and two gas branch pipes respectively. The gas storage device is connected to the inlet of the electromagnetic reversing valve through a pipeline. The two outlets of the electromagnetic reversing valve are respectively connected to one end of the nitrogen pipe and the air inlet end of the gas booster pump. The other end of the nitrogen pipe extends into the casing, and the nitrogen pipe is used for injecting nitrogen into the drilling; the electromagnetic reversing valve is used for controlling the connection between the gas storage device and the nitrogen pipe or the gas booster pump; one end of the slurry mixing pipe is respectively connected to the two slurry storage containers, and the other end is connected to the grouting pipe; the gas booster pump is used for boosting the gas and entering the two slurry storage containers through the air inlets, pushing the slurry raw materials in the two slurry storage containers to be mixed through the slurry mixing pipe and then injected into the drilling through the grouting pipe; a proportional regulating valve is installed on the gas transmission main pipe for regulating the amount of gas injected into the two slurry storage containers; flow meters are installed on the two gas branch pipes for monitoring the amount of gas injected into the two slurry storage containers;

[0009] The data monitoring device includes a gas monitoring pipe, a negative pressure exhaust fan, a gas analyzer, and an environmental monitoring device; one end of the gas monitoring pipe extends into the borehole through a casing, the other end of the gas monitoring pipe is connected to the inlet of the negative pressure exhaust fan, and the outlet of the negative pressure exhaust fan is connected to the gas analyzer, which is used to extract the gas in the borehole to the gas analyzer, and the gas analyzer analyzes the extracted gas to obtain gas data; the environmental monitoring device extends into the borehole through the casing to monitor the environmental data in the borehole;

[0010] The console is connected to the gas booster pump, electromagnetic reversing valve, proportional regulating valve, negative pressure exhaust fan, flowmeter, gas analyzer, and environmental monitoring device. After analyzing and processing the data monitored by the gas analyzer, flowmeter, and environmental monitoring device, it adjusts the opening and closing of the gas booster pump, electromagnetic reversing valve, proportional regulating valve, and negative pressure exhaust fan.

[0011] Furthermore, the drilling mechanism includes a drill rig and a drill bit, and the drill bit is installed on the drill rig.

[0012] Furthermore, the drilling and grouting integrated mechanism further includes a fixator, which is installed at the end of the grouting monitoring main pipe. The fixator is composed of multiple conical steel needles and is used to insert into the surface layer of the front rock mass to make the drilling and grouting integrated mechanism stable during the drilling and grouting process.

[0013] Furthermore, the environmental monitoring device includes a temperature sensor and a pressure sensor, which are used to collect the temperature data and pressure data in the borehole.

[0014] Furthermore, a plurality of baffles are arranged in the slurry mixing pipe. The plurality of baffles are arranged in two rows along the axial direction of the slurry mixing pipe, and the two rows of baffles are staggered with each other. Each baffle in each row is parallel to each other, and is used to make the slurry passing through the slurry mixing pipe be evenly mixed under the action of each baffle.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. By combining a pneumatic booster pump with a proportional regulating valve, the utility model accurately controls the flow of the slurry with high-pressure nitrogen. It can not only determine the required amount of grouting material according to the porosity of the goaf, but also push the slurry to flow and inject nitrogen into the goaf to further dilute the dangerous gas in the goaf, improving the accuracy of the slurry consumption and the safety during the grouting process.

[0017] 2. In the present utility model, the casing and the grouting pipe are used in combination. The monitoring results are fed back through the environmental monitoring device and the gas analyzer. Since the casing can be moved, the grouting range can be adjusted more flexibly according to the fissure conditions at different depths of the borehole. For abnormal conditions of different types of data, on-site grouting in the goaf ahead or other preventive measures can be implemented. Moreover, the environmental monitoring device and the gas analyzer can realize real-time monitoring of temperature, different gas concentrations, and pressure throughout the whole process before, during, and after grouting, and timely feedback data anomalies at the required positions, greatly increasing the safety during underground operations and the accuracy and effectiveness during the grouting process.

[0018] 3. The present utility model is provided with an electromagnetic directional valve, which can connect the gas storage device with the nitrogen pipe or the gas booster pump as needed. When grouting is required to seal the fissure, the nitrogen in the gas storage device is used as power to promote the mixing and injection of the slurry. When the initial stage of coal spontaneous combustion occurs, nitrogen can be directly and quickly injected into the borehole to dilute oxygen and dangerous gases, ultimately delaying or preventing the further development of coal spontaneous combustion and ensuring the safe mining of the coal mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present utility model;

[0020] Figure 2 is the structural schematic diagram when the present utility model is inserted into the borehole during use;

[0021] Figure 3 is the internal schematic diagram of the slurry mixing pipe in the present utility model.

[0022] In the figure: 1 - coal seam, 2 - borehole, 3 - gas storage device, 4 - gas analyzer, 5 - negative pressure exhaust fan, 6 - electromagnetic directional valve, 7 - nitrogen pipe, 8 - gas monitoring pipe, 9 - gas booster pump, 10 - slurry storage container, 11 - proportional regulating valve, 12 - flowmeter, 13 - pressure detector, 14 - liquid level gauge, 15 - slurry mixing pipe, 16 - grouting monitoring main pipe, 17 - casing, 18 - drill rig, 19 - drill bit, 20 - fixator, 21 - grouting pipe, 22 - environmental monitoring device, 23 - console, 24 - slider. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further described below.

[0024] As Figure 1 and 2 shown, the present utility model includes an integrated drilling and grouting mechanism, a data monitoring device, a gas booster pump 9, a slurry storage device, a gas storage device 3, and a console 23;

[0025] The integrated drilling and grouting mechanism includes a grouting monitoring main pipe 16, a drilling mechanism, a casing 17, and a grouting pipe 21. The drilling mechanism is installed outside the grouting monitoring main pipe 16 and is used to drill a hole 2 into the coal seam 1. The drilling mechanism includes a drill rig 18 and a drill bit 19, and the drill bit 19 is installed on the drill rig 18. The inner wall of the grouting monitoring main pipe 16 is provided with internal threads. The casing 17 is installed inside the grouting monitoring main pipe 16, and a slider 24 is installed outside it. The surface of the slider 24 is provided with external threads. By the mutual cooperation of the internal and external threads, the rotation of the casing 17 enables the casing 17 to slide along the axial direction of the grouting monitoring main pipe 16 and makes one end of it extend out of the grouting monitoring main pipe 16 into the inside of the hole 2. The grouting pipe 21 is installed inside the casing 17 and is used to grout into the inside of the hole 2.

[0026] The slurry storage device includes two slurry storage containers 10 and a slurry mixing pipe 15. Air inlet holes, feed ports, and pressure detectors 13 are provided on the upper parts of the two slurry storage containers 10. The feed ports are used to put slurry raw materials into the slurry storage containers 10. The pressure detectors 13 are used to monitor the air pressure inside the slurry storage containers 10. Liquid level gauges 14 are installed on the lower parts of the two slurry storage containers 10 and are used to monitor the amount of raw materials inside. The air outlet end of the gas booster pump 9 is connected to the air inlet holes of the two slurry storage containers 10 respectively through a main gas transmission pipe and two gas branch pipes. The gas storage device 3 is connected to the inlet of the electromagnetic reversing valve 6 through a pipeline. The two outlets of the electromagnetic reversing valve 6 are respectively connected to one end of a nitrogen gas pipe 7 and the air inlet end of the gas booster pump 9. The other end of the nitrogen gas pipe 7 extends into the casing 17, and the nitrogen gas pipe 7 is used to inject nitrogen gas into the hole 2. The electromagnetic reversing valve 6 is used to control the connection between the gas storage device 3 and the nitrogen gas pipe 7 or the gas booster pump 9. One end of the slurry mixing pipe 15 is respectively connected to the two slurry storage containers 10, and the other end is connected to the grouting pipe 21. The gas booster pump 9 is used to boost the gas and enter the two slurry storage containers 10 through the air inlet holes, push the slurry raw materials in the two slurry storage containers 10 to be mixed through the slurry mixing pipe 15, and then inject them into the hole 2 through the grouting pipe 21. A proportional regulating valve 11 is installed on the main gas transmission pipe and is used to regulate the amount of gas injected into the two slurry storage containers 10. Flow meters 12 are installed on the two gas branch pipes and are used to monitor the amount of gas injected into the two slurry storage containers 10. As Figure 3 shown, a plurality of baffles are provided inside the slurry mixing pipe 15. The plurality of baffles are arranged in two rows along the axial direction of the slurry mixing pipe 15, and the two rows of baffles are staggered with each other. Each baffle in each row is parallel to each other and is used to make the slurry passing through the slurry mixing pipe 15 be evenly mixed under the action of each baffle.

[0027] The data monitoring device includes a gas monitoring pipe 8, a negative pressure exhaust fan 5, a gas analyzer 4, and an environmental monitoring device 22; one end of the gas monitoring pipe 8 extends into the borehole 2 through a casing 17, the other end of the gas monitoring pipe 8 is connected to the inlet of the negative pressure exhaust fan 5, and the outlet of the negative pressure exhaust fan 5 is connected to the gas analyzer 4, which is used to extract the gas in the borehole 2 to the gas analyzer 4, and the gas analyzer 4 analyzes the extracted gas to obtain gas data; the environmental monitoring device 22 extends into the borehole 2 through the casing 17 to monitor the environmental data in the borehole 2; the environmental monitoring device 22 includes a temperature sensor and a pressure sensor, which are used to collect the temperature data and pressure data in the borehole 2.

[0028] The control console 23 is connected to a gas booster pump 9, an electromagnetic reversing valve 6, a proportional regulating valve 11, a negative pressure exhaust fan 5, a flow meter 12, a gas analyzer 4, and an environmental monitoring device 22. After obtaining the data monitored by the gas analyzer 4, the flow meter 12, and the environmental monitoring device 22 for analysis and processing, it adjusts the opening and closing of the gas booster pump 9, the electromagnetic reversing valve 6, the proportional regulating valve 11, and the negative pressure exhaust fan 5.

[0029] As an improvement of the present invention, the drilling and grouting integrated mechanism further includes a fixator 20, which is installed at the end of the grouting monitoring main pipe 16. The fixator 20 is composed of multiple conical steel needles and is used to insert into the surface layer of the front rock mass to make the drilling and grouting integrated mechanism stable in position during the drilling and grouting process.

[0030] The above control console 23, gas booster pump 9, electromagnetic reversing valve 6, proportional regulating valve 11, negative pressure exhaust fan 5, flow meter 12, gas analyzer 4, and environmental monitoring device 22 are all existing equipment or components and can be directly purchased from the market; for example, in this embodiment, the model of the pneumatic booster pump 9 is selected as the ODMT gas booster pump, the model of the flow meter 12 is selected as the ACU10FD-XP flow meter, and the model of the gas analyzer 4 is selected as the GASTiger2000.

[0031] The working process of the present invention is as follows:

[0032] Step 1: On the premise that a large - scale goaf is found in front during the tunneling or coal mining process, before the grouting starts, use a drilling device to drill a borehole into the coal seam, and make the borehole 2 extend into the front goaf. Combine a borehole peephole instrument and an electromagnetic detector to jointly explore the approximate range and porosity of the front goaf.

[0033] Step 2: Based on the size of the front porosity, combined with the geological data of the location, determine the mechanical characteristics of the local rock and the mechanical properties of the grouting material used, calculate the range to be reinforced and the raw slurry conditions of component A and component B of the grouting material and their dosages; put the determined raw slurries of component A and component B into two slurry storage containers 10 respectively.

[0034] Step 3: Input the required dosage of the determined grouting material into the console 23.

[0035] Step 4: Use the fixator 20 to fix the drilling and grouting integrated mechanism. Then, by rotating, extend the casing 17 out of the grouting monitoring main pipe 16 and into the borehole 2. At this time, the grouting pipe 21 and the gas monitoring pipe 8 enter the deep part of the borehole 2 along with the casing 17; subsequently, send the environmental monitoring device 22 into the borehole deeper than the casing 17 through the casing 17.

[0036] Step 5: Determine the grouting range. The console 23 first controls the electromagnetic directional valve 6 to connect the gas storage device 3 with the gas booster pump 9. Then, start the gas booster pump 9 and adjust the flow rate of the high-pressure nitrogen gas flowing out of the gas booster pump 9 into the two slurry storage containers 10 by controlling the opening and closing of the proportional regulating valve 11. Furthermore, the nitrogen gas pushes the slurry in the two slurry storage containers 10 to flow out and enter the slurry mixing pipe 15. The outflow rate of the slurry can be controlled by controlling the amount of nitrogen gas entering. Control to make the two raw slurries mix evenly in the slurry mixing pipe 15. At this time, the mixed slurry is injected into the position where grouting is required through the slurry mixing pipe 15 and the grouting pipe 21. During the grouting process, always pay attention to the flow rate and pressure of the grouting pipe 21 to ensure that the required grouting dosage is achieved.

[0037] Step 6: After the grouting is completed, use the gas monitoring pipe 8 and the negative pressure exhaust fan 5 to extract the gas in the grouting area and the area in front of the seal, and transmit it to the gas analyzer 4 for gas concentration monitoring. Combine the temperature data and air pressure data monitored by the environmental monitoring device 22 to determine whether there are still voids or coal spontaneous combustion situations (if the oxygen concentration in the monitored gas remains high, it indicates that external air continuously enters the goaf, indicating the existence of voids; if the temperature continues to rise, the air pressure increases, and the concentrations of carbon monoxide and carbon dioxide in the gas continue to rise, it indicates that coal spontaneous combustion has occurred). If it is judged that there are voids, repeat the above process of grouting and plugging fissures; if it is judged that there is a coal spontaneous combustion situation, the console 23 controls the electromagnetic directional valve 6 to switch, disconnect the gas storage device 3 from the gas booster pump 9, and connect it to the nitrogen pipe 7; at this time, nitrogen gas is injected into the borehole 2 through the nitrogen pipe 7, and the dangerous gas is diluted by injecting nitrogen gas at the required position, and preliminary protection is carried out on the coal spontaneous combustion to delay its development speed, facilitating the staff to take other measures in time; through the above measures, continue tunneling only after all monitoring data are normal.

[0038] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A device for preventing and controlling the disaster of spontaneous combustion of coal and gas co-existence, characterized in that: It includes an integrated drilling and grouting mechanism, a data monitoring device, a gas booster pump, a slurry storage device, a gas storage device and a control console; The integrated drilling and grouting mechanism comprises a grouting monitoring main pipe, a drilling mechanism, a casing and a grouting pipe. The drilling mechanism is installed outside the grouting monitoring main pipe and is used to drill into the coal seam. The inner wall of the grouting monitoring main pipe is provided with an internal thread. The casing is installed in the grouting monitoring main pipe, and a slider is installed outside the grouting monitoring main pipe. The surface of the slider is provided with an external thread. The rotating casing is mutually matched with the internal and external threads to make the casing slide along the axial direction of the grouting monitoring main pipe and one end of the casing extends out of the grouting monitoring main pipe to the inside of the borehole. The grouting pipe is installed in the casing and is used to grout into the inside of the borehole. The slurry storage device comprises two slurry storage containers and a slurry mixing pipe. The upper parts of the two slurry storage containers are provided with an air inlet, a feed port and a pressure detector. The feed port is used to put slurry raw materials into the slurry storage container; the pressure detector is used to monitor the air pressure in the slurry storage container; the lower parts of the two slurry storage containers are equipped with liquid level gauges for monitoring the amount of raw materials inside; the outlet end of the gas booster pump is respectively connected to the air inlet holes of the two slurry storage containers through the gas delivery main pipe and two gas branch pipes, the gas storage device is connected to the inlet of the electromagnetic reversing valve through a pipeline, and the two outlets of the electromagnetic reversing valve are respectively connected to one end of the nitrogen pipe and the gas The inlet end of the booster pump is connected, and the other end of the nitrogen pipe extends into the casing. The nitrogen pipe is used to inject nitrogen into the borehole; the electromagnetic reversing valve is used to control the gas storage device to be connected with the nitrogen pipe or the gas booster pump; one end of the slurry mixing pipe is respectively connected to the two slurry storage containers, and the other end is connected to the grouting pipe; the gas booster pump is used to pressurize the gas and enter the two slurry storage containers through the air inlet hole, and push the slurry raw materials in the two slurry storage containers to mix through the slurry mixing pipe and then inject them into the borehole through the grouting pipe; the two gas branch pipes are equipped with flow meters for monitoring the amount of gas injected into the two slurry storage containers; The data monitoring device includes a gas monitoring tube, a negative pressure exhaust fan, a gas analyzer and an environmental monitoring device; one end of the gas monitoring tube extends into the borehole through a casing, the other end of the gas monitoring tube is connected to the inlet of the negative pressure exhaust fan, and the outlet of the negative pressure exhaust fan is connected to the gas analyzer, which is used to extract the gas in the borehole to the gas analyzer, and the gas analyzer analyzes the extracted gas to obtain gas data; the environmental monitoring device extends into the borehole through the casing, and is used to monitor the environmental data in the borehole; The console is connected to the gas booster pump, the electromagnetic reversing valve, the proportional control valve, the negative pressure exhaust fan, the flow meter, the gas analyzer and the environmental monitoring device, and is used to obtain data monitored by the gas analyzer, the flow meter and the environmental monitoring device, analyze and process them, and then adjust the opening and closing of the gas booster pump, the electromagnetic reversing valve, the proportional control valve and the negative pressure exhaust fan.

2. The device for preventing and controlling the disaster of spontaneous combustion of coal and gas co-existence according to claim 1 is characterized in that: The drilling mechanism comprises a drilling machine and a drill bit, wherein the drill bit is installed on the drilling machine.

3. The device for preventing and controlling the disaster of spontaneous combustion of coal and gas co-existence according to claim 1 is characterized in that: The integrated drilling and grouting mechanism also includes a fixer, which is installed at the end of the grouting monitoring main pipe. The fixer is composed of multiple conical steel needles and is used to insert into the front rock surface to stabilize the position of the integrated drilling and grouting mechanism during the drilling and grouting process.

4. The device for preventing and controlling the disaster of spontaneous combustion of coal and gas coexistence according to claim 1 is characterized in that: The environmental monitoring device includes a temperature sensor and an air pressure sensor, which are used to collect temperature data and air pressure data in the borehole.

5. The device for preventing and controlling the disaster of spontaneous combustion of coal and gas co-existence according to claim 1 is characterized in that: A plurality of baffles are arranged in the slurry mixing tube, which are arranged in two rows along the axial direction of the slurry mixing tube, and the two rows of baffles are staggered with each other. The baffles in each row are parallel to each other, so that the slurry passing through the slurry mixing tube is evenly mixed by the baffles.

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