Gas drainage device and method for coal mine

Abstract

The invention provides a coal mine gas drainage device and drainage method.The coal mine gas drainage device comprises a plurality of gas drainage main pipelines, a plurality of gas drainage units, a control unit and a monitoring unit, and the gas drainage main pipelines and the gas drainage units are alternately arranged in the gas flowing direction; at least one gas drainage main pipeline is arranged at the two ends of each gas drainage unit, so that gas can flow along the gas drainage main pipelines under the action of the gas drainage units; the monitoring unit is arranged on the gas drainage main pipeline and connected with the control unit, all the gas drainage units are connected with the control unit, the monitoring unit monitors the state of gas in the gas drainage main pipeline, the control unit receives data detected by the monitoring unit and controls one or more gas drainage units to act, arrangement is flexible, installation is convenient, and the monitoring unit is connected with the control unit. Extra systems such as a pump room and a whole set of pipelines do not need to be additionally built, the construction period is short, and cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine production, and in particular relates to a gas extraction device and extraction method for coal mines. Background Art

[0002] As the coal mining face continues to lengthen, due to the obstruction of the back channel of the working face, air leakage in the top extraction lane, and poor extraction effect, the gas in the upper corner of the coal mining face will be too large or exceed the limit, and the gas accumulation and hypoxia problems in the upper corner will become more serious, seriously threatening the life safety of coal mine workers and greatly restricting the efficient and stable operation of coal mine production. High-gas mines can be solved by gas extraction systems. The gas extraction system adopts buried pipe extraction in the goaf, coal seam drilling extraction, and roof drilling extraction. The gas is transported to the ground through gas extraction pipelines for discharge. For low-gas mines, excessive gas and hypoxia in the upper corner are sporadic. The design and installation of the gas extraction system is time-consuming and expensive. The installed extraction system has a low utilization rate and increases maintenance costs. There is a fundamental shortage of gas extraction devices in low-gas mines, and there is a gap in gas extraction devices in low-gas mines.

[0003] Since the problems of excessive gas and low oxygen in low-gas mines are more prominent, appropriate gas extraction equipment that can be used in low-gas mines has broad application prospects.

[0004] Traditional gas extraction systems usually include: gas pumps, such as centrifugal blowers, rotary blowers and water ring vacuum pumps, which are used to extract gas and are core equipment; pipeline systems are responsible for extracting gas from coal seams and safely transporting it to the ground; gas extraction pump stations are located in the return air shaft industrial square. When traditional gas extraction systems are used in low-gas mines, pump rooms need to be installed on the ground, and pipelines need to be laid from the ground to the underground. The approval, installation and construction period is about 1 year, and the application cost is high.

[0005] In addition, the system still has some problems: first, since the gas pump extracts once and then transports it through pipelines, the gas pump's pumping function must be strong to adapt to the maximum possible gas flow in the mine, which increases the cost; second, the gas pump usually needs to be arranged once and its power adjustment flexibility is limited, which makes the supporting pipeline system costly to modify. In other words, the flexibility of the entire system needs to be improved. Summary of the invention

[0006] In view of the above problems, the present invention provides a coal mine gas extraction device and extraction method to solve at least one of the above or other problems existing in the prior art.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a gas extraction device for coal mines, comprising a plurality of gas extraction main pipelines, a plurality of gas extraction units, a control unit and a monitoring unit, wherein: Along the gas flow direction, the gas extraction main pipeline and the gas extraction unit are arranged alternately, and at least one gas extraction main pipeline is arranged at both ends of each gas extraction unit, so that the gas can flow along multiple gas extraction main pipelines under the action of the gas extraction unit; The monitoring unit is arranged on the gas extraction main pipeline, the monitoring unit is connected to the control unit, each gas extraction unit is connected to the control unit, the monitoring unit monitors the gas status in the gas extraction main pipeline, the control unit receives the monitoring data of the monitoring unit, and controls the action of one or more gas extraction units.

[0008] Furthermore, the gas extraction unit is an ejector-type gas diluter.

[0009] Furthermore, the monitoring unit includes a temperature detection device, a pressure detection device, a flow detection device and a concentration detection device, and the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are all connected to the control unit; each gas extraction main pipeline is provided with a temperature detection device and / or a pressure detection device and / or a flow detection device and / or a concentration detection device.

[0010] Furthermore, the monitoring unit includes a temperature detection device, a pressure detection device, a flow detection device and a concentration detection device, and the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are all connected to the control unit; the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are arranged on the last gas extraction main pipeline.

[0011] Furthermore, it also includes multiple groups of extraction branches, any group of extraction branches is arranged on one side of any gas extraction unit, and the two ends of the extraction branch are respectively connected to the gas extraction main pipelines at the two ends of the gas extraction unit, so that the gas in the gas extraction main pipeline can flow along the extraction branch.

[0012] Furthermore, the extraction branch includes a first gas extraction unit and gas extraction branch pipes arranged at both ends of the first gas extraction unit, and the gas extraction branch pipes are connected to the gas extraction main pipe.

[0013] Furthermore, a plugging assembly is provided on any gas extraction main pipeline arranged at the air inlet end of the gas extraction unit, and along the direction of gas flow, the plugging assembly is arranged on the rear side of the connection between the gas extraction branch pipeline and the gas extraction main pipeline. The plugging assembly can move relative to the gas extraction main pipeline so that the plugging assembly can block the gas extraction main pipeline and allow the gas to enter the gas extraction branch pipeline.

[0014] Furthermore, the blocking assembly includes a blocking part and a blocking power part connected to the blocking part. The blocking power part is arranged on the outside of the gas extraction main pipeline. The blocking part is arranged on the gas extraction main pipeline. Under the action of the blocking power part, the blocking part can move along the radial direction of the gas extraction main pipeline so as to block the gas extraction main pipeline.

[0015] Furthermore, the size of the plugging member is not less than the radial size of the gas extraction main pipeline.

[0016] Further, the blocking power component is a spring; or, the blocking power component is a pneumatic clamping component, and the pneumatic clamping component is connected to the control unit.

[0017] Furthermore, ventilation holes and shielding members are provided on the peripheral side walls of the gas extraction main pipeline. There are multiple ventilation holes, which are arranged along the circumferential direction of the gas extraction main pipeline. The shielding member is movably provided on the gas extraction main pipeline. The shielding member can shield the area where the ventilation holes are located to control whether the air outside the gas extraction main pipeline enters the gas main pipeline.

[0018] Furthermore, the shielding member is connected to a shielding driving device, which is connected to the control unit. The shielding member moves relative to the gas extraction main pipeline under the driving action of the shielding driving device.

[0019] Furthermore, a plurality of ventilation holes are arranged at the air inlet end of the gas extraction main pipeline close to the gas extraction unit.

[0020] Furthermore, it also includes a first main pipeline, one end of which is connected to the upper corner area of ​​the comprehensive mining working face, and the other end of the first main pipeline is respectively connected to multiple gas extraction main pipelines. The radial dimension of the first main pipeline is larger than the radial direction of the gas extraction main pipeline, so as to divert the gas flowing out from the upper corner area.

[0021] A coal mine gas extraction method, using the coal mine gas extraction device as described above to extract gas, during the gas extraction process, includes: Each gas extraction unit operates to extract gas, so that the gas flows along each gas extraction main pipeline; The monitoring unit monitors the gas status in the gas extraction main pipeline and transmits the monitoring data to the control unit. The control unit compares the monitoring data with the preset value and determines whether the working status of the gas extraction unit, the status of the gas at the upper corner and the gas transportation status are normal based on the comparison results.

[0022] Furthermore, if the gas concentration monitoring data and / or temperature monitoring data are greater than the corresponding preset values, the control unit controls the movement of the shielding member on the gas extraction main pipeline equipped with the concentration detection device and / or temperature detection device, and the shielding member is moved away from the ventilation hole to allow external air to enter the gas extraction main pipeline.

[0023] Furthermore, if the gas flow monitoring data and / or the gas pressure monitoring data are greater than the corresponding preset values, it is judged that an abnormality has occurred in the gas extraction unit connected to the gas extraction main pipeline where the pressure detection device and / or the flow detection device is located, and the control unit controls the gas extraction unit to stop working, and the control unit controls the action of the sealing component to reverse the gas flow.

[0024] Furthermore, if the gas concentration monitoring data and / or temperature monitoring data and / or pressure monitoring data and / or gas flow monitoring data are greater than the corresponding measurement data of the gas at the upper corner of the comprehensive mining working face, it is judged that the gas concentration, temperature, pressure and flow at the upper corner are abnormal, and the control unit controls the action of the gas extraction unit, the sealing assembly and the shielding member.

[0025] Due to the adoption of the above technical solution, the coal mine gas extraction device adopts a method of arranging multiple gas extraction units on a transmission pipeline composed of multiple gas extraction main pipelines, wherein the multiple gas extraction units are arranged at intervals along the flow direction of the gas, and the gas extraction units and the gas extraction main pipeline are arranged at intervals, so that the transmission pipeline composed of the gas extraction main pipeline and the gas extraction units is flexible in layout and convenient in installation; The gas extraction unit is an ejector-type gas diluter, which adopts a vortex airflow booster structure design to meet the use needs of low-gas coal mines. It does not require the construction and installation of additional systems such as pump rooms and a full set of pipelines. It uses compressed air as the power instead of electricity. The process does not use electricity and has high strength, high efficiency and high safety. Only a single device needs to be installed to achieve the gas extraction requirements in gas-accumulated areas. The construction period is short, which can reduce the deployment cost of the extraction system and increase the coverage rate of the gas extraction system in low-gas mines, thereby effectively reducing the safety risks of coal mines and ensuring the safety of miners and the normal operation of coal mines. The setting of multiple gas extraction units can form a negative pressure system in the upper corner of the fully-mechanized mining face, increase ventilation volume, improve oxygen concentration, assist in strengthening the extraction of extraction pipelines, improve gas extraction capacity, avoid gas accumulation in the upper corner, solve the hidden dangers of gas exceeding the limit and hypoxia in the upper corner, eliminate safety hazards, and ensure the safety of the fully-mechanized mining face; The monitoring unit and control unit are set up to carry out real-time monitoring, data analysis and remote control of the equipment, realize the automation of the gas extraction system, adapt to the changes in gas flow in the mine, improve production efficiency and achieve efficient recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a coal mine gas extraction device according to an embodiment of the present invention; Figure 2 1 is another structural schematic diagram of a coal mine gas extraction device according to an embodiment of the present invention (a monitoring unit and a control unit are not shown); Figure 3 1 is a schematic diagram of a third structure of a coal mine gas drainage device according to an embodiment of the present invention (a monitoring unit and a control unit are not shown); Figure 4 It is a fourth structural schematic diagram of a coal mine gas extraction device according to an embodiment of the present invention (the monitoring unit and the control unit are not shown).

[0027] In the figure: 1. Gas extraction main pipeline; 2. Gas extraction unit; 3. First gas extraction unit; 4. Blocking piece; 5. Blocking power piece; 6. Ventilation hole; 7. Shielding piece; 8. First main pipeline. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Figure 1 A structural schematic diagram of an embodiment of the present invention is shown. The present invention relates to a gas extraction device and extraction method for coal mines, which are used in low-gas mines to extract gas from the upper corner area of ​​the comprehensive mining working face and discharge the gas to the ground. The gas extraction device for coal mines uses a plurality of gas extraction main pipelines to set a plurality of gas extraction units on a transmission pipeline. The plurality of gas extraction units are arranged along the gas flow direction to sequentially extract gas, so that the gas is extracted multiple times during the flow process. At the same time, the extraction pipeline is arranged flexibly, without the need to construct and install additional systems such as pump rooms and a full set of pipelines. Only a single gas extraction main pipeline and a gas extraction unit need to be installed to achieve the gas extraction requirements of the gas gathering area. The installation is convenient and the production cost is reduced.

[0030] A gas extraction device for coal mines is used in the coal mining industry, especially in low-gas coal mines, to extract and transport gas from the upper corners of fully mechanized mining working faces in low-gas coal mines. It can also be used in tunnel construction and ventilation and exhaust operations in narrow working environments, and has a wide range of applications.

[0031] Specifically, Figure 1As shown, the gas extraction device for coal mines includes multiple gas extraction main pipelines 1, multiple gas extraction units 2, a control unit and a monitoring unit. Along the gas flow direction, the multiple gas extraction main pipelines 1 and the multiple gas extraction units 2 are alternately arranged, and at least one gas extraction main pipeline 1 is respectively arranged at both ends of any gas extraction unit 2, so that the gas can flow along the multiple gas extraction main pipelines 1 under the action of the gas extraction unit 2. The gas extraction unit 2 sucks the gas to provide power for the flow of the gas, so that the gas flows along the extraction pipeline, and the gas is transported from the gathering area under the mine to the ground, thereby realizing the extraction and transportation of gas in the coal seam and tunnel under the mine. When multiple gas extraction main pipelines 1 are set up, the multiple gas extraction main pipelines 1 are connected and communicated in sequence along the gas flow direction to form a gas transmission pipeline, and multiple gas extraction units 2 are set on the transmission pipeline formed by the multiple gas extraction main pipelines 1. The gas extraction unit 2 is communicated with the gas extraction main pipeline 1. One end of the first gas extraction main pipeline 1 is located at the upper corner of the comprehensive mining working face, so that the gas gathered at the upper corner enters the gas extraction main pipeline 1, and flows along each gas extraction main pipeline 1 under the suction action of the gas extraction unit 2. The last gas extraction main pipeline 1 is connected to the ground to transport and discharge the gas, and transport the gas from the underground to the ground.

[0032] The monitoring unit is arranged on the gas extraction main pipeline 1, the monitoring unit is connected to the control unit, and each gas extraction unit 2 is connected to the control unit. The monitoring unit monitors the state of gas in the gas extraction main pipeline 1 and transmits the monitoring data to the control unit. The control unit processes the monitoring data and controls the corresponding gas extraction unit 2 to operate according to the processing result. The setting of the monitoring unit can monitor the working state of each gas extraction unit 2 and the state of gas in each gas extraction main pipeline 1 in real time, so as to judge whether each gas extraction main pipeline 1 has an abnormality, judge whether each gas extraction unit 2 has an abnormality, and judge whether the gas in the upper corner is too large or exceeds the limit, etc., solve the problem of gas exceeding the limit and hypoxia hidden dangers in the upper corner, ensure the life safety of coal mine workers, and make the coal mine production run stably. The setting of the control unit makes the coal mine gas extraction device have a high degree of automation and improves production efficiency.

[0033] When multiple gas extraction main pipelines 1 and multiple gas extraction units 2 are set, multiple gas extraction main pipelines 1 and multiple gas extraction units 2 are set alternately in sequence, that is, multiple gas extraction main pipelines 1 and multiple gas extraction units 2 are set alternately one after another, one gas extraction main pipeline 1, one gas extraction unit 2, one gas extraction main pipeline 1, one gas extraction unit 2, ..., two adjacent gas extraction main pipelines 1 are connected and communicated through a gas extraction unit 2, and multiple gas extraction units 2 are arranged at intervals on the transmission pipeline formed by multiple gas extraction main pipelines 1. During the gas transportation process, the gas is sucked at different positions to increase the gas transportation speed, strengthen the extraction of the gas extraction main pipeline 1, and improve the gas extraction capacity. Alternatively, when multiple gas extraction main pipelines 1 and multiple gas extraction units 2 are set, multiple gas extraction main pipelines 1 can be respectively set at both ends of a gas extraction unit 2, and multiple gas extraction units 2 are arranged at intervals on the transmission pipeline formed by multiple gas extraction main pipelines 1. Multiple gas extraction units 2 divide the transmission pipeline formed by multiple gas extraction main pipelines 1 into multiple transmission parts, that is, two gas extraction main pipelines 1, one gas extraction unit 2, three gas extraction main pipelines 1, one gas extraction unit 2, ..., there is at least one gas extraction main pipeline 1 between two adjacent gas extraction units 2, and each gas extraction unit 2 sequentially extracts the gas flowing along the transmission pipeline at different positions of the transmission pipeline to increase the flow speed of the gas. The setting method of multiple gas extraction units 2 and multiple gas extraction main pipelines 1 is selected and set according to the number of gas extraction units 2 and the number of gas extraction main pipelines 1, and no specific requirements are made here.

[0034] The above-mentioned gas extraction main pipeline 1 is an anti-static galvanized pipeline, which is a commercially available product and is selected according to actual needs. No specific requirements are made here.

[0035] The above-mentioned gas extraction unit 2 is an ejection-type gas diluter, which is a commercially available product and is selected according to actual needs. No specific requirements are made here.

[0036] The above-mentioned monitoring unit includes a temperature detection device, a pressure detection device, a flow detection device and a concentration detection device. The temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are all connected to the control unit. The temperature detection device is used to measure the temperature of the gas during the transportation process. The pressure detection device is used to measure the pressure in the gas extraction main pipeline 1. The flow detection device is used to measure the flow rate during the gas transportation process. The concentration detection device is used to measure the concentration during the gas transportation process. The temperature detection device, the pressure detection device, the flow detection device and the concentration detection device monitor the corresponding state parameters in real time during the gas transportation process, and send the monitoring data to the control unit. The control unit receives the monitoring data and compares the monitoring data with the corresponding pre-set parameter preset values. According to the comparison results, the gas extraction unit 2 and other devices are controlled to operate, so as to realize real-time monitoring of various state parameters during the gas transportation process. When the parameters are abnormal, an abnormality judgment is made, and the corresponding device actions are controlled to realize the automation of the gas extraction and transportation process, ensure the safety of gas transportation, and improve production efficiency.

[0037] The gas extraction main pipeline 1 is provided with a temperature detection device and / or a pressure detection device and / or a flow detection device and / or a concentration detection device, that is, on any gas extraction main pipeline 1, only one detection device can be set, such as: setting a temperature detection device or a pressure detection device or a flow detection device or a concentration detection device, or, on any gas extraction main pipeline 1, two or more detection devices can be set, such as: setting a temperature detection device and a pressure detection device, or, setting a temperature detection device, a pressure detection device and a flow detection device, or, setting a temperature detection device, a pressure detection device, a flow detection device and a concentration detection device. The setting method of the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device is selected according to actual needs, and no specific requirements are made here.

[0038] In some feasible embodiments, preferably, the temperature detection device includes a temperature sensor, the pressure detection device includes a pressure sensor and a negative pressure sensor, the flow detection device includes a flow sensor, and the concentration detection device includes a gas concentration sensor.

[0039] Since gas includes methane, carbon monoxide, carbon dioxide and nitrogen, the main component of gas is methane. Therefore, the above-mentioned concentration sensors include a methane concentration sensor for measuring methane concentration, a carbon monoxide concentration sensor for measuring carbon monoxide concentration, and an oxygen concentration sensor for measuring oxygen concentration. It can also include a carbon dioxide concentration sensor for measuring carbon dioxide concentration and a nitrogen concentration sensor for measuring nitrogen concentration. The types of concentration sensors are selected according to actual needs and no specific requirements are made here.

[0040] In some other feasible embodiments, the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are arranged on the last gas extraction main pipeline 1, and no monitoring unit is arranged on the other gas extraction main pipelines 1. Only the temperature, pressure, flow rate and concentration and other related parameters of the gas on the last gas extraction main pipeline 1 are measured to judge whether each gas extraction main pipeline 1 and each gas extraction unit 2 are working normally during the gas transportation process, and at the same time judge whether the gas extraction in the upper corner area is normal, such as: judging whether the gas at the upper corner is gathered according to whether the concentration, temperature and pressure of the gas in the upper corner area are normal, so as to control the action of each gas extraction unit 2. If the gas at the upper corner is not gathered, each gas extraction unit 2 maintains the current working state unchanged. If the gas at the upper corner is gathered, the working state of part or all of the gas extraction units 2 is controlled to change, so as to accelerate the extraction and transportation of the gas, avoid the gas gathering at the upper corner, and avoid the occurrence of gas explosion.

[0041] The above-mentioned control unit includes a data acquisition device, a data transmission device connected to the data acquisition device, a data processing device connected to the data transmission device, and a display device connected to the data processing device. The data acquisition device is connected to the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device respectively to collect monitoring data of the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device. The data transmission device is used to transmit the data collected by the data acquisition device to the data processing device. The data processing device processes the monitoring data. The data processing device is preset with preset values ​​of temperature, pressure, concentration and flow. The data processing device compares the monitoring data with the preset values, judges the current working status of each gas extraction unit 2 and the status of the gas at the upper corner according to the comparison result, and controls the action of each gas extraction unit 2. The display device displays the monitoring data of the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device in real time, displays the working status of each gas extraction unit 2 in real time, and displays the status of the gas at the upper corner in real time, so that the staff can judge the current working environment status underground.

[0042] The above-mentioned data acquisition device is connected to a power supply, which supplies power to the data acquisition device to ensure the normal operation of the data acquisition device. The data acquisition device is a data acquisition station, which is a commercially available product. It is selected according to actual needs and no specific requirements are made here. The data acquisition device is installed in a mine under the ground so that the data acquisition device can be connected to various detection devices of the monitoring unit.

[0043] The above-mentioned data transmission device is an optical terminal, which is a commercially available product. It is selected according to actual needs and no specific requirements are made here. The transmitting end of the optical terminal is installed in the mine under the ground so that the transmitting end of the optical terminal is connected to the data acquisition device, and the receiving end of the optical terminal is located on the ground so that the optical terminal is connected to the data processing device.

[0044] The above-mentioned data processing device is a CPU or a PLC, which is a commercially available product and is selected according to actual needs. No specific requirements are made here. The data processing device is installed on the ground so that the data processing device can be connected to the display device.

[0045] The above-mentioned display device is a display, which is a commercially available product and is selected according to actual needs. No specific requirements are made here. The display device is installed on the ground so that the staff can view the relevant parameters and the working status of each gas extraction unit 2 and the status of the gas in the upper corner in real time.

[0046] Further optimization scheme, such as Figure 2 As shown, the gas extraction device for coal mines also includes multiple groups of extraction branches, any group of extraction branches is arranged on one side of any gas extraction unit 2, and the two ends of the extraction branch are respectively connected to the gas extraction main pipeline 1 at the two ends of the gas extraction unit 2, so that the gas in the gas extraction main pipeline 1 can flow along the extraction branch. The setting of the extraction branch diverts and reverses the gas in the gas extraction main pipeline 1. When an abnormality occurs in the gas extraction unit 2 on the gas extraction main pipeline 1, the gas extraction main pipeline 1 at the air inlet end of the gas extraction unit 2 can be closed, and the gas flows along the extraction branch, thereby improving work efficiency.

[0047] The above-mentioned extraction branch includes a first gas extraction unit 3 and a gas extraction branch pipe arranged at both ends of the first gas extraction unit 3. The gas extraction branch pipe is connected to the gas extraction main pipe 1. Through the setting of the gas extraction branch pipe, the first gas extraction unit 3 is connected to the gas extraction main pipe 1, and the gas in the gas extraction main pipe 1 is extracted and transported. The first gas extraction unit 3 is arranged in parallel on one side of the gas extraction unit 2, and the gas extraction branch pipe at one end of the first gas extraction unit 3 is connected with the gas extraction main pipe 1 at the corresponding end of the gas extraction unit 2, and the gas extraction branch pipe at the other end of the first gas extraction unit 3 is connected with the gas extraction main pipe 1 at the corresponding other end of the gas extraction unit 2, so that the gas that should enter the gas extraction unit 2 enters the first gas extraction unit 3 along the gas extraction branch pipe, and enters the gas extraction main pipe 1 at the other end of the gas extraction unit 2 through the action of the first gas extraction unit 3, and continues to be transported, so that the abnormal gas extraction unit 2 can be maintained without stopping the work.

[0048] In some feasible embodiments, the first gas extraction unit 3 is an ejection-type gas diluter, and the gas extraction branch pipe is an anti-static galvanized pipe.

[0049] The gas extraction unit 2 is connected to the gas extraction main pipeline 1 via a connector, and the first gas extraction unit 3 is connected to the gas extraction branch pipeline via a connector, which is preferably a flange.

[0050] In some feasible embodiments, preferably, the number of extraction branches is consistent with the number of gas extraction units 2 , and one extraction branch is provided on one side of each gas extraction unit 2 .

[0051] In order to achieve the blocking of the gas extraction main pipeline 1 at the air inlet end of the abnormal gas extraction unit 2 and realize the reversal of gas flow, a blocking component is provided on any gas extraction main pipeline 1 at the air inlet end of the gas extraction unit 2, and along the direction of gas flow, the blocking component is arranged at the rear side of the connection between the gas extraction branch pipeline and the gas extraction main pipeline 1, and the blocking component can move relative to the gas extraction main pipeline 1, so that the blocking component can block the gas extraction main pipeline 1 and allow the gas to enter the gas extraction branch pipeline. When unit 2 works normally without any abnormality, the blocking component does not block the gas extraction main pipeline 1, and most of the blocking component can be located outside the gas extraction main pipeline 1 to avoid the blocking component from obstructing the flow of gas; when the gas extraction unit 2 has an abnormality and cannot work normally, the blocking component moves relative to the gas extraction main pipeline 1, and the blocking component enters the gas extraction main pipeline 1 to block the gas extraction main pipeline 1, cutting off the flow of gas. The gas changes its flow direction and enters the gas extraction branch pipeline to achieve reversal of gas flow.

[0052] The above-mentioned plugging assembly includes a plugging member 4 and a plugging power member 5 connected to the plugging member 4. The plugging power member 5 is arranged on the outside of the gas extraction main pipeline 1, and the plugging member 4 is arranged on the gas extraction main pipeline 1. Under the action of the plugging power member 5, the plugging member 4 can move along the radial direction of the gas extraction main pipeline 1 to block the gas extraction main pipeline 1. In order to enable the plugging member 4 to enter the gas extraction main pipeline 1, a through hole is arranged on the gas extraction main pipeline 1, and the plugging member 4 can enter the gas extraction main pipeline 1 through the through hole. The size of the through hole is adapted to the maximum size of the plugging member 4, so that the plugging member 4 can pass through the through hole to enter the gas extraction main pipeline 1 and the plugging member 4 can be moved out of the gas extraction main pipeline 1 through the through hole.

[0053] The size of the plugging member 4 is not less than the radial size of the gas extraction main pipeline 1, so that the plugging member 4 can completely block the gas extraction main pipeline 1, and at the same time, the plugging power member 5 will not interfere with the gas extraction main pipeline 1. The cross-sectional shape of the portion of the plugging member 4 located inside the gas extraction main pipeline 1 is adapted to the cross-sectional shape of the gas extraction main pipeline 1, so that the plugging member 4 can block the gas extraction main pipeline 1, and the portion of the plugging member 4 located outside the gas extraction main pipeline 1 is used to connect with the plugging power member 5, so that the plugging power member 5 drives the plugging member 4 to operate.

[0054] The plugging member 4 is a plate-like structure. A through hole is provided on the side of the gas extraction main pipeline 1 facing the plugging member 4. The through hole is a strip-shaped hole. The width of the strip-shaped hole is adapted to the thickness of the plugging member 4, so that the plugging member 4 and the through hole are matched with each other. The gap between the plugging member 4 and the side wall of the through hole is small, so as to prevent external impurities from entering the gas extraction main pipeline 1. When the plugging member 4 is not plugged in the gas extraction main pipeline 1, at least part of it is located at the through hole, so that the plugging member 4 always plugs the through hole, so as to prevent external impurities from entering the gas extraction main pipeline 1. When the plugging member 4 is set, it is set along the radial direction of the gas extraction main pipeline 1, so that the plugging member 4 moves along the radial direction of the gas extraction main pipeline 1 to plug the gas extraction main pipeline 1.

[0055] In some feasible embodiments, the blocking member 4 may be a steel plate.

[0056] The above-mentioned blocking power component 5 is a spring, one end of the spring is fixedly connected to the blocking component 4, and the other end of the spring is connected to the external supporting structure of the gas extraction unit 2. In view of the working principle of the gas extraction unit 2, during the gas transportation process, the pressure in the gas extraction main pipeline 1 is relatively large, and the spring is in a compressed state. The blocking component 4 is outside the gas extraction main pipeline 1 under the action of pressure and does not block the gas extraction main pipeline 1. When the gas extraction unit 2 works abnormally, the pressure at the air inlet end of the gas extraction unit 2 decreases, and the blocking component 4 enters the gas extraction main pipeline 1 under the action of the spring restoring force to block the gas extraction main pipeline 1.

[0057] Alternatively, the blocking power member 5 is a pneumatic clamping member, which is connected to the control unit, one end of which is fixedly mounted on the support structure, and the blocking member 4 is fixedly mounted on the moving end of the pneumatic clamping member, and the pneumatic clamping member drives the blocking member 4 to move. The pneumatic clamping member is a pneumatic clamping claw, which is a commercially available product and is selected according to actual needs. In this structure, the blocking power member 5 is connected to the control unit, and the control unit controls the action of the blocking power member 5.

[0058] The above-mentioned supporting structure can be the wall of the tunnel, a supporting frame or other structures that can facilitate the installation of the blocking power member 5. It is a conventional structure and will not be described in detail here.

[0059] Further optimization scheme, such as Figure 3 As shown, when the concentration of gas in the gas extraction main pipeline 1 is too high and / or the temperature in the gas extraction main pipeline 1 is too high, in order to dilute and / or cool the gas, ventilation holes 6 and shielding members 7 are provided on the peripheral side wall of the gas extraction main pipeline 1. The number of ventilation holes 6 is multiple, and the multiple ventilation holes 6 are sequentially arranged along the circumferential direction of the gas extraction main pipeline 1. The arrangement of the ventilation holes 6 allows fresh air outside the gas extraction main pipeline 1 to enter the gas extraction main pipeline 1. The shielding member 7 is movably arranged on the gas extraction main pipeline 1, and the shielding member 7 can move the ventilation holes 6. The area where it is located is blocked to control whether the air outside the gas extraction main pipeline 1 enters the gas main pipeline through the ventilation hole 6 to dilute the gas. The setting of the shielding member 7 allows the ventilation hole 6 to be selectively blocked or not, so that the ventilation hole 6 is opened when the gas in the gas extraction main pipeline 1 needs to be diluted or cooled down, and is not blocked, so that the external air enters the gas extraction main pipeline 1. When the gas in the gas extraction main pipeline 1 does not need to be diluted or cooled down, the shielding member 7 blocks the ventilation hole 6, and the external air does not enter the gas extraction main pipeline 1.

[0060] When the ventilation holes 6 are provided, a plurality of ventilation holes 6 are provided at the air inlet end of the gas extraction main pipeline 1 close to the gas extraction unit 2, and the negative pressure suction force of the air inlet end of the gas extraction unit 2 when working is used to suck the external air into the gas extraction main pipeline 1. The number of ventilation holes 6 is selected according to the size of the ventilation holes 6 and the radial size of the gas extraction main pipeline 1, and no specific requirements are made here.

[0061] According to the setting position of the ventilation holes 6, the above-mentioned shielding member 7 can be mounted on the gas extraction main pipeline 1, and the shielding member 7 is clearance-matched with the gas extraction main pipeline 1, and the shielding member 7 can move along the axial direction of the gas extraction main pipeline 1 to shield the ventilation holes 6. In this structural case, the shielding member 7 is an annular structure, and multiple ventilation holes 6 are distributed on the circumferential side of the gas extraction main pipeline 1. The width of the shielding member 7 is adapted to the area occupied by the multiple ventilation holes 6, and all ventilation holes 6 can be shielded; or, the above-mentioned shielding member 7 is a plate-like structure, and its shape is adapted to the shape of the gas extraction main pipeline 1, so that The shielding member 7 can be fitted onto the outer wall of the gas extraction main pipeline 1. In this case, the cross-sectional shape of the shielding member 7 is arc-shaped, and a plurality of ventilation holes 6 are arranged on part of the circumferential side of the gas extraction main pipeline 1. The area of ​​the shielding member 7 is adapted to the area occupied by the plurality of ventilation holes 6, and all ventilation holes 6 can be shielded. To facilitate the installation of the shielding member 7, a groove can be provided on the gas extraction main pipeline 1, and a plurality of ventilation holes 6 are provided at the bottom of the groove. The groove is provided along the circumferential direction of the gas extraction main pipeline 1, and the shielding member 7 is inserted into the slide grooves on the two oppositely arranged side walls of the groove, and can move in the groove along the slide groove.

[0062] In order to realize automatic movement of the shielding member 7, the shielding member 7 is connected to a shielding driving device, and the shielding driving device is connected to the control unit. The shielding member 7 moves under the driving action of the shielding driving device, relatively close to or away from the ventilation hole 6. When moving, the shielding member 7 moves along the axial direction or circumferential direction of the gas extraction main pipeline 1.

[0063] In some feasible embodiments, the shielding driving device is preferably a cylinder, and the shielding driving device is fixedly mounted on a supporting structure outside the gas extraction main pipeline 1.

[0064] Further optimization scheme, such as Figure 4 As shown, the gas extraction device for coal mine also includes a first main pipeline 8, one end of which is connected to the upper corner area of ​​the gas mine, and the other end of the first main pipeline 8 is respectively connected to multiple gas extraction main pipelines 1, and the radial dimension of the first main pipeline 8 is larger than the radial direction of the gas extraction main pipeline 1, so that the gas flowing out from the upper corner area of ​​the gas mine is diverted, and the gas at the upper corner enters the first main pipeline 8, flows along the first main pipeline 8, and then enters each gas extraction main pipeline 1 connected to the first main pipeline 8, flows along each gas extraction main pipeline 1, and the gas at the upper corner is diverted and transported, so that the gas at the upper corner can be quickly extracted.

[0065] The other end of each gas extraction main pipeline 1 connected to the first main pipeline 8 is connected to multiple gas extraction units 2 and multiple gas extraction main pipelines 1, such as the above-mentioned gas transmission pipelines, and multiple gas transmission pipelines perform gas extraction at the same time.

[0066] A coal mine gas extraction method, using the coal mine gas extraction device as described above to extract gas. Before extracting the gas, first install the coal mine gas extraction device. According to the measured coal seam gas content and the characteristics of gas outburst in the comprehensive mining face, select a corresponding number of gas extraction main pipelines 1 and gas extraction units 2. According to the design requirements, install multiple gas extraction main pipelines 1 and multiple gas extraction units 2 to form at least one gas transmission pipeline. When there are multiple gas transmission pipelines, a first main pipeline 8 can be set to divert and transport the gas at the upper corner. When extracting gas at the upper corner of the comprehensive mining face, the control unit controls the action of each gas extraction unit 2 to extract the gas at the upper corner, so that the gas flows along the gas transmission pipeline and is discharged to the ground. Each gas extraction unit 2 gradually provides power to the flow of gas, so that the gas is quickly transported. Of course, a pumping branch can also be set on one side of the gas extraction unit 2, and the setting can be selected according to actual needs. In this structure, a plugging component is set on the gas extraction main pipeline 1 to reverse the flow of the gas; In order to control the concentration of gas, a ventilation hole 6 and a shielding member 7 are provided on the gas extraction main pipeline 1; Various types of detection devices of the monitoring unit are installed on the corresponding gas extraction main pipeline 1 according to design requirements.

[0067] The gas drainage process includes: The control unit controls the operation of each gas extraction unit 2 to extract the gas so that the gas flows along each gas extraction main pipeline 1; During the gas transportation process, the monitoring unit monitors the gas extraction status and transmits the monitoring data to the control unit. Here, the monitoring unit detects the concentration, temperature, flow rate and pressure of the gas, and transmits the real-time monitoring data to the control unit, which receives the real-time measured data; The control unit compares the monitoring data with the preset values, and determines whether the working status of the gas extraction unit 2, the status of the gas at the upper corner, and the gas transportation status are normal based on the comparison results, and controls the corresponding gas extraction unit 2 and the sealing assembly and shielding member 7 arranged on the gas extraction main pipeline 1 to operate.

[0068] Specifically, if the gas concentration monitoring data and / or temperature monitoring data are greater than the corresponding preset values, the control unit controls the shielding member 7 on the gas extraction main pipeline 1 equipped with the concentration detection device and / or temperature detection device to operate, and the shielding member 7 is away from the ventilation hole 6, so that external air enters the gas extraction main pipeline 1 to dilute and / or cool the gas. Otherwise, the shielding member 7 does not operate.

[0069] If the gas pressure monitoring data and / or the gas flow monitoring data are greater than the corresponding preset values, it is judged that the gas extraction unit 2 connected to the gas extraction main pipeline 1 where the pressure detection device and / or the flow detection device is located has an abnormality, and the control unit controls the gas extraction unit 2 to stop working. At the same time, the control unit controls the blocking component arranged on the gas extraction main pipeline 1 to operate, so that the gas changes direction and enters the extraction branch roads arranged at both ends of the gas extraction unit 2 for transportation. The control unit controls the first gas extraction unit 3 on the extraction branch road to operate to extract the gas, and the gas enters the main pipeline again through the extraction branch road to isolate the abnormal gas extraction unit 2 for maintenance.

[0070] If the gas concentration monitoring data and / or temperature monitoring data and / or pressure monitoring data and / or gas flow monitoring data are greater than the concentration measurement data, temperature measurement data, pressure measurement data and flow measurement data at the upper corner, it is judged that the gas concentration, temperature, pressure and flow at the upper corner are abnormal, and the control unit controls the gas extraction unit 1 to adjust the power, controls the sealing component and the shielding member 7 to move, and adjusts the gas concentration, temperature, pressure and flow.

[0071] Due to the adoption of the above technical scheme, the gas extraction device for coal mines adopts a plurality of gas extraction units arranged on a transmission pipeline composed of a plurality of gas extraction main pipelines. The plurality of gas extraction units are arranged at intervals along the flow direction of the gas, and the gas extraction units and the gas extraction main pipeline are arranged at intervals, so that the transmission pipeline composed of the gas extraction main pipeline and the gas extraction unit is flexible in layout and convenient in installation; the gas extraction unit is an ejection-type gas diluter, which adopts a vortex airflow pressurization structure design to meet the use needs of low-gas coal mines, and does not require the additional construction and installation of additional systems such as pump rooms and a full set of pipelines. It uses compressed air as power instead of electric energy as power. The process does not use electric energy and has high strength, high efficiency and high safety. Only a single device needs to be installed to achieve gas in gas-accumulated areas. The gas extraction requirements are high and the construction period is short. It can reduce the deployment cost of the gas extraction system and increase the coverage rate of the gas extraction system in low-gas mines, thereby effectively reducing the safety risks of coal mines and ensuring the safety of miners and the normal operation of coal mines; the setting of multiple gas extraction units can form a negative pressure system in the upper corner of the comprehensive mining face, increase ventilation volume, increase oxygen concentration, assist in strengthening the extraction of the extraction pipeline, improve the gas extraction capacity, avoid gas accumulation in the upper corner, solve the hidden dangers of gas exceeding the limit and hypoxia in the upper corner, eliminate safety hazards, and ensure the safety of the comprehensive mining face; the setting of monitoring units and control units can monitor the equipment in real time, analyze data and remotely control it, realize the automation of the gas extraction system, adapt to the changes in gas flow in the mine, improve production efficiency, and realize efficient recovery.

[0072] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A gas extraction device for coal mines, characterized in that: It includes a plurality of gas extraction main pipelines, a plurality of gas extraction units, a control unit and a monitoring unit, wherein: Along the gas flow direction, the gas extraction main pipeline and the gas extraction unit are arranged alternately, and at least one gas extraction main pipeline is arranged at both ends of each gas extraction unit, so that the gas can flow along the multiple gas extraction main pipelines under the action of the gas extraction unit; The monitoring unit is arranged on the gas extraction main pipeline, the monitoring unit is connected to the control unit, each of the gas extraction units is connected to the control unit, the monitoring unit monitors the gas status in the gas extraction main pipeline, the control unit receives the monitoring data of the monitoring unit, and controls the operation of one or more gas extraction units.

2. The coal mine gas extraction device according to claim 1, characterized in that: The gas extraction unit is an ejector-type gas diluter.

3. The coal mine gas extraction device according to claim 1, characterized in that: The monitoring unit includes a temperature detection device, a pressure detection device, a flow detection device and a concentration detection device, and the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are all connected to the control unit; each of the gas extraction main pipelines is provided with the temperature detection device and / or the pressure detection device and / or the flow detection device and / or the concentration detection device.

4. The coal mine gas extraction device according to claim 1, characterized in that: The monitoring unit includes a temperature detection device, a pressure detection device, a flow detection device and a concentration detection device, and the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are all connected to the control unit; the temperature detection device, the pressure detection device, the flow detection device and the concentration detection device are arranged on the last gas extraction main pipeline.

5. The coal mine gas extraction device according to claim 3 or 4, characterized in that: It also includes multiple groups of extraction branches, any group of the extraction branches is arranged on one side of any gas extraction unit, and the two ends of the extraction branches are respectively connected to the gas extraction main pipelines at the two ends of the gas extraction unit, so that the gas in the gas extraction main pipeline can flow along the extraction branches.

6. The coal mine gas extraction device according to claim 5, characterized in that: The extraction branch includes a first gas extraction unit and gas extraction branch pipelines arranged at both ends of the first gas extraction unit, and the gas extraction branch pipelines are connected to the gas extraction main pipeline.

7. The coal mine gas extraction device according to claim 6, characterized in that: A plugging component is provided on any of the gas extraction main pipelines arranged at the air inlet end of the gas extraction unit, and along the direction of gas flow, the plugging component is arranged on the rear side of the connection between the gas extraction branch pipeline and the gas extraction main pipeline, and the plugging component can be moved relative to the gas extraction main pipeline so that the plugging component can block the gas extraction main pipeline and allow the gas to enter the gas extraction branch pipeline.

8. The coal mine gas extraction device according to claim 7, characterized in that: The blocking assembly includes a blocking part and a blocking power part connected to the blocking part, wherein the blocking power part is arranged on the outside of the gas extraction main pipeline, and the blocking part is arranged on the gas extraction main pipeline. Under the action of the blocking power part, the blocking part can move along the radial direction of the gas extraction main pipeline so as to block the gas extraction main pipeline.

9. The coal mine gas extraction device according to claim 8, characterized in that: The size of the blocking member is not less than the radial size of the gas extraction main pipeline.

10. The coal mine gas extraction device according to claim 8 or 9, characterized in that: The blocking power component is a spring; or, the blocking power component is a pneumatic clamping component, and the pneumatic clamping component is connected to the control unit.

11. The coal mine gas drainage device according to any one of claims 1 to 4 and 6, characterized in that: Ventilation holes and shielding members are provided on the peripheral side walls of the gas extraction main pipeline. There are multiple ventilation holes, which are arranged along the circumferential direction of the gas extraction main pipeline. The shielding member is movably provided on the gas extraction main pipeline. The shielding member can shield the area where the ventilation holes are located to control whether the air outside the gas extraction main pipeline enters the gas main pipeline.

12. The coal mine gas extraction device according to any one of claims 7 to 9, characterized in that: Ventilation holes and shielding members are provided on the peripheral side walls of the gas extraction main pipeline. There are multiple ventilation holes, which are arranged along the circumferential direction of the gas extraction main pipeline. The shielding member is movably provided on the gas extraction main pipeline. The shielding member can shield the area where the ventilation holes are located to control whether the air outside the gas extraction main pipeline enters the gas main pipeline.

13. The coal mine gas extraction device according to claim 11, characterized in that: The shielding member is connected to a shielding driving device, and the shielding driving device is connected to the control unit. The shielding member moves relative to the gas extraction main pipeline under the driving action of the shielding driving device.

14. The coal mine gas extraction device according to claim 11, characterized in that: A plurality of ventilation holes are arranged at the air inlet end of the gas extraction main pipeline close to the gas extraction unit.

15. The coal mine gas drainage device according to any one of claims 1-4, 6-9 and 13-14, characterized in that: It also includes a first main pipeline, one end of which is connected to the upper corner area of ​​the comprehensive mining working face, and the other end of the first main pipeline is respectively connected to multiple gas extraction main pipelines. The radial dimension of the first main pipeline is larger than the radial direction of the gas extraction main pipeline, so as to divert the gas flowing out from the upper corner area.

16. A method for extracting coal mine gas, characterized in that: The gas is extracted by using the coal mine gas extraction device as claimed in any one of claims 1 to 11 and 13 to 15, and during the gas extraction process, the process includes: Each gas extraction unit operates to extract gas, so that the gas flows along each gas extraction main pipeline; The monitoring unit monitors the gas status in the gas extraction main pipeline and transmits the monitoring data to the control unit. The control unit compares the monitoring data with the preset value and determines whether the working status of the gas extraction unit, the status of the gas at the upper corner and the gas transportation status are normal according to the comparison result.

17. A method for extracting coal mine gas, characterized in that: The gas extraction device for coal mine as claimed in claim 12 is used to extract gas, and during the gas extraction process, the process includes: Each gas extraction unit operates to extract gas, so that the gas flows along each gas extraction main pipeline; The monitoring unit monitors the gas status in the gas extraction main pipeline and transmits the monitoring data to the control unit. The control unit compares the monitoring data with the preset value and determines whether the working status of the gas extraction unit, the status of the gas at the upper corner and the gas transportation status are normal according to the comparison result.

18. The method for coal mine gas extraction according to claim 17, characterized in that: If the gas concentration monitoring data and / or temperature monitoring data are greater than the corresponding preset values, the control unit controls the movement of the shielding member on the gas extraction main pipeline equipped with the concentration detection device and / or temperature detection device, and the shielding member moves away from the ventilation hole to allow external air to enter the gas extraction main pipeline.

19. The method for coal mine gas extraction according to claim 18, characterized in that: If the gas flow monitoring data and / or the gas pressure monitoring data are greater than the corresponding preset values, it is judged that the gas extraction unit connected to the gas extraction main pipeline where the pressure detection device and / or the flow detection device is located is abnormal, and the control unit controls the gas extraction unit to stop working, and the control unit controls the blocking component to operate and reverse the gas flow.

20. The coal mine gas extraction method according to any one of claims 17 to 19, characterized in that: If the gas concentration monitoring data and / or temperature monitoring data and / or pressure monitoring data and / or gas flow monitoring data are greater than the corresponding gas measurement data at the upper corner of the comprehensive mining working face, it is judged that the gas concentration, temperature, pressure and flow at the upper corner are abnormal, and the control unit controls the action of the gas extraction unit, the sealing assembly and the shielding member.

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