Mine gas monitoring system for layered mining

Abstract

The embodiment of the utility model discloses a mine gas monitoring system for layered mining, relates to the field of gas monitoring for layered mining of extra-thick coal seams, and can effectively improve the accuracy of mine gas monitoring. The layered mining mine gas monitoring system comprises a work station, a data transmission unit and a wind speed monitoring device which is used for monitoring the wind speed of a specified position; the gas monitoring device is used for monitoring the gas concentration of the to-be-detected area; the signal acquisition device is used for receiving and transmitting a monitoring signal of the wind speed monitoring device and / or a monitoring signal of the monitoring part; the method is suitable for the scene of super-thick coal seam layered mining in the mine.

Description

Technical Field

[0001] This application relates to the field of gas monitoring for the slicing mining of extra-thick coal seams, and particularly relates to a mine gas monitoring system for slicing mining. Background Art

[0002] In real scenarios, coal spontaneous combustion, as one of the five major disasters in coal mines, has caused more than 90% of mine fire accidents. Therefore, preventing fires caused by coal spontaneous combustion and minimizing the harm of mine fires is a major problem in the safe mining of coal mines. For extra-thick coal seams, the slicing mining method is often used for mining; during the process of using slicing mining, a large number of mining-induced fissures are generated in the overlying strata, and the gob areas of the upper and lower slices are interconnected to form a composite gob area. As the upper slice working face continuously advances, the overlying strata break and collapse, forming mining-induced fissures in the strata; after the lower slice coal seam is mined, it causes the coal and rock strata to break and collapse again, and the permeability of the rock mass changes, thereby making the seepage characteristics of air extremely complex. Due to the different manifestations of mine pressure, the gob permeability is also different from that of a single coal seam.

[0003] Compared with traditional gas monitoring, airflows also cause greater interference to gas concentration monitoring. In the context of slicing mining, due to the different number distributions of mining-induced fissures from those of a single coal seam, there are problems with changes in the air leakage distribution and the "three zones" of spontaneous combustion compared with a single coal seam. At the same time, the results of gas concentration are more easily affected by the air leakage wind speed and air humidity. Utility Model Content

[0004] In order to solve the problem that airflows cause great interference to gas concentration monitoring during the existing slicing mining process, this application provides a mine gas monitoring system for slicing mining.

[0005] An embodiment of this application provides a mine gas monitoring system for slicing mining, including:

[0006] A wind speed monitoring device, which is used to release a tracer gas at a preset release position in the mine and monitor the tracer gas at a preset monitoring position;

[0007] A gas monitoring device, which includes a gas monitoring bundle tube and a monitoring component. The monitoring component is arranged inside the gas monitoring bundle tube, and the gas monitoring bundle tube is used to be arranged at a position to be measured in the mine;

[0008] A signal acquisition device, which is used to receive and transmit the monitoring signal of the wind speed monitoring device and / or the monitoring signal of the monitoring component.

[0009] In a specific embodiment, the monitoring component includes at least one of the following: an oxygen sensor, a temperature sensor, a methane sensor, and a nitrogen sensor.

[0010] In a specific embodiment, the gas monitoring bundle tube at least includes a first bundle tube and a second bundle tube. Among them, the monitoring components arranged in the first bundle tube include an oxygen sensor and a nitrogen sensor, and the monitoring components arranged in the second bundle tube include a temperature sensor and a methane sensor.

[0011] In a specific embodiment, the gas monitoring bundle tube includes an upper stratified monitoring bundle tube, which is used to be arranged at the top position of the goaf in the lower stratified area of the mine to measure the gas in the goaf in the upper stratified area of the mine.

[0012] In a specific embodiment, the gas monitoring bundle tube further includes a lower stratified monitoring bundle tube, which is used to be arranged at the working face in the lower stratified area of the mine to measure the gas in the goaf in the lower stratified area of the mine.

[0013] In a specific embodiment, the gas monitoring device further includes a nitrogen injection pipeline, which is used to inject nitrogen with a preset flow rate into a preset nitrogen injection position in the mine.

[0014] In a specific embodiment, the signal acquisition device includes a core switch, a backbone switch, a base station, and a routing node. The core switch is connected to the backbone switch through a gigabit industrial Ethernet cable. The backbone switch is connected to the base station through a CAN bus. The base station is connected to the routing node, and the routing node is connected to the wind speed monitoring device and / or the monitoring component.

[0015] In a specific embodiment, the mine gas monitoring system for stratified mining further includes a workstation and a data transmission unit. Among them, the workstation is connected to the core switch and is used to analyze the monitoring signals of the wind speed monitoring device and / or the monitoring component. The data transmission unit is connected to the workstation and is used to transmit the analysis result of the workstation to a target terminal.

[0016] In a specific embodiment, the wind speed monitoring device includes a qualitative detector.

[0017] The mine gas monitoring system for stratified mining provided by the embodiments of the present application includes a wind speed monitoring device, a gas monitoring device, and a signal acquisition device. The wind speed monitoring device is used to release a tracer gas at a preset release position in the mine and monitor the tracer gas at a preset monitoring position. The gas monitoring device includes a gas monitoring bundle tube and a monitoring component. The monitoring component is arranged in the gas monitoring bundle tube, and the gas monitoring bundle tube is used to be arranged at a to-be-detected position in the mine. The signal acquisition device is used to receive and transmit the monitoring signal of the wind speed monitoring device and / or the monitoring signal of the monitoring component. This system can accurately monitor the gas concentration in the mine during stratified mining, thereby providing an analysis basis for the monitoring and prevention of mine fires. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A diagram of a mine gas monitoring system for stratified mining provided by an embodiment of the present application;

[0020] Figure 2 Provided by an embodiment of the present application A transverse sectional view of the qualitative detector located in the lower stratified composite gob of the working face;

[0021] Figure 3 A transverse sectional view of the gas component and concentration monitoring of the upper stratified gob by the sensor part through the roof drilling of the lower stratified provided by an embodiment of the present application;

[0022] Figure 4 A transverse sectional view of the gas component and concentration monitoring of the lower stratified gob by the sensor part through the pre-buried bundle tube of the lower stratified working face provided by an embodiment of the present application;

[0023] Figure 5 A flowchart of the workstation processing monitoring data provided by an embodiment of the present application.

[0024] Main reference numeral descriptions:

[0025] 1 - Workstation; 2 - Data transmission unit; 3 - Core switch; 4 - Gigabit industrial Ethernet cable; 5 - Backbone switch; 6 - CAN bus; 7 - Base station; 8 - Routing node; 9 - Bundle tube; 10 - Oxygen wireless sensor; 11 - Temperature wireless sensor; 12 - Methane wireless sensor; 13 - Nitrogen wireless sensor; 14 - SF6 qualitative detector; 15 - Nitrogen injection pipeline. Detailed Description of the Embodiments

[0026] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0028] As Figure 2 shown, an embodiment of the present application provides a mine gas monitoring system for stratified mining. The device may include:

[0029] An air velocity monitoring device for measuring the air velocity at the surface fissures on the intake and return air sides;

[0030] A gas monitoring device including a bundle tube 9 and a monitoring component for monitoring the gas density at a preset position;

[0031] A signal acquisition device for receiving and transmitting the monitoring signals of the air velocity monitoring device and / or the monitoring signals of the monitoring component;

[0032] The mine gas monitoring system for stratified mining provided by the embodiment of the present application includes an air velocity monitoring device, a gas monitoring device, and a signal acquisition device. The air velocity monitoring device is used to release a tracer gas at a preset release position in the mine and monitor the tracer gas at a preset monitoring position; the gas monitoring device includes a gas monitoring bundle tube and a monitoring component. The monitoring component is arranged in the gas monitoring bundle tube, and the gas monitoring bundle tube is used to be arranged at a to-be-detected position in the mine; the signal acquisition device is used to receive and transmit the monitoring signals of the air velocity monitoring device and / or the monitoring signals of the monitoring component; this system can accurately monitor the gas concentration in the mine during stratified mining, thereby providing an analysis basis for the monitoring and prevention of mine fires.

[0033] Optionally, in an embodiment of the present application, the monitoring component includes at least one of the following: an oxygen sensor, a temperature sensor, a methane sensor, a nitrogen sensor; for detecting corresponding data of the gas;

[0034] Furthermore, the monitoring component can select an oxygen wireless sensor 10, a temperature wireless sensor 11, a methane wireless sensor 12, and a nitrogen wireless sensor 13 for wirelessly transmitting the detection data of the monitoring component. It can be understood that using wireless transmission can make the information transmission in the mine more convenient.

[0035] Optionally, in an embodiment of the present application, the bundle tube 9 at least includes a first bundle tube and a second bundle tube. An oxygen wireless sensor 10 and a nitrogen wireless sensor 13 are arranged in the first bundle tube, and a temperature wireless sensor 11 and a methane wireless sensor 12 are arranged in the second bundle tube. The bundle tube 9 is used to protect the monitoring member.

[0036] Optionally, in an embodiment of the present application, the upper-layer bundle tube provided with the monitoring member is arranged at the top position of the goaf in the lower layer of the mine, and is used to measure the gas in the upper-layer goaf of the mine, such as Figure 3 shown.

[0037] Optionally, in an embodiment of the present application, the lower-layer monitoring bundle tube provided with the monitoring member is arranged at the working face in the lower layer of the mine, and is used to measure the gas in the lower-layer goaf of the mine, such as Figure 4 .

[0038] Optionally, in an embodiment of the present application, the gas monitoring device further includes a nitrogen injection pipeline 15. The nitrogen injection pipeline 15 is used to inject nitrogen with a preset flow rate into a preset nitrogen injection position in the mine. By adjusting parameters such as the position and flow rate of nitrogen injection, the actually measured nitrogen concentration is compared with the theoretical calculation result under numerical simulation to optimize the numerical calculation model.

[0039] Optionally, in an embodiment of the present application, the signal acquisition device includes a core switch 3, a backbone switch 5, a base station 7, and a routing node 8. The core switch 3 is connected to the backbone switch 5 through a gigabit industrial Ethernet cable 4. The backbone switch 5 is connected to the base station 7 through a CAN bus 6. The base station 7 is connected to the routing node 8, and the routing node 8 is connected to the wind speed monitoring device and / or the monitoring member.

[0040] Optionally, in an embodiment of the present application, the gas monitoring system for a stratified mining mine further includes a workstation 1 and a data transmission unit 2.

[0041] Optionally, in an embodiment of the present application, the workstation 1 is connected to the core switch 3 through a gigabit industrial Ethernet cable 4, and is used to analyze and process the data transmitted by the signal acquisition device.

[0042] Optionally, in an embodiment of the present application, the data transmission unit 2 is connected to the workstation, and is used to transmit the result analyzed and processed by the workstation to the target terminal. For example, the data transmission unit can be communicatively connected to a mobile terminal to facilitate the user to obtain relevant data results in a timely manner.

[0043] Optionally, in an embodiment of the present application, measuring points of an SF6 qualitative detector are arranged at the fissures on the ground surface on the intake and return air sides, and an SF6 qualitative detector is arranged at the return air corner of the mine working face, such as Figure 2As shown in the figure, SF6 gas can be released at a preset release position, and detected by the SF6 qualitative detector 14 at a preset monitoring position, such as the return air corner of the working face. The release time and reception time are synchronously recorded throughout the test. According to the distance between the preset release position and the preset monitoring position, the corresponding wind speed can be measured.

[0044] When the system is actually used, after the SF6 gas is released at the measuring point, the SF6 qualitative detector 14 is used to detect at the return air corner of the working face, and the release time and reception time are synchronously recorded throughout the test. At the same time, the oxygen wireless sensor 10, nitrogen wireless sensor 13, temperature wireless sensor 11 and methane wireless sensor 12 arranged in the beam tube 9 also start to detect the gas at their respective positions. Then, the SF6 qualitative detector and the monitoring components transmit the detected data back to the workstation 1 on the ground through the routing node 8, base station 7, CAN bus 6, backbone switch 5, gigabit industrial Ethernet cable 4, and core switch 3. The data processing flow of the workstation 1 is as Figure 5 shown. The workstation 1 calculates the surface air leakage wind speed according to the detected data. For the wind speed and gas components of each point, the more accurate porosity, inertial resistance, viscous resistance and oxygen consumption rate of the gob are calculated through MATLAB (commercial mathematical software) in the workstation, and are converted into UDF (user-defined function) and input into the numerical simulation, so as to have a clearer understanding of the "spontaneous combustion" three zones. Subsequently, according to the calculation results in the workstation 1 on the ground, parameters such as the position and flow rate of nitrogen injection are adjusted, and nitrogen is injected into the corresponding position through the nitrogen injection pipeline 15. After reaching a steady state, the measurement is carried out again, and the above operations are repeated until the data finally calculated on the workstation 1 is approximately the same as the actual monitoring.

[0045] Through the above technical solutions, by using the wireless sensor network, the influence of the mine air flow on gas concentration monitoring can be analyzed during mine gas monitoring, and the problem that the theoretical calculation under numerical simulation may not be accurate can be solved, so as to accurately monitor the gas concentration in the mine during stratified mining, thereby providing an analysis basis for the monitoring and prevention of mine fires.

[0046] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0047] The above has described in detail the embodiments of the present application. Those skilled in the art can design and modify the device and its usage mode within the scope of the present application according to the on-site construction situation.

[0048] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other, and the differences between each embodiment and other embodiments are emphasized.

[0049] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A mine gas monitoring system for stratified mining, characterized in that, Including: A wind speed monitoring device, which is used to release a tracer gas at a preset release position in a mine and monitor the tracer gas at a preset monitoring position; A gas monitoring device, which includes a gas monitoring beam tube and a monitoring component. The monitoring component is arranged in the gas monitoring beam tube, and the gas monitoring beam tube is used to be arranged at a position to be measured in the mine; A signal acquisition device, which is used to receive and transmit the monitoring signal of the wind speed monitoring device and / or the monitoring signal of the monitoring component.

2. The mine gas monitoring system for stratified mining according to claim 1, wherein The monitoring component includes at least one of the following: an oxygen sensor, a temperature sensor, a methane sensor, and a nitrogen sensor.

3. The mine gas monitoring system for stratified mining according to claim 2, wherein, The gas monitoring beam tube at least includes a first beam tube and a second beam tube. Among them, the monitoring components arranged in the first beam tube include an oxygen sensor and a nitrogen sensor, and the monitoring components arranged in the second beam tube include a temperature sensor and a methane sensor.

4. The mine gas monitoring system for stratified mining according to claim 3, characterized in that, The gas monitoring beam tube includes an upper layer monitoring beam tube, which is used to be arranged at the top position of the goaf in the lower layer of the mine to measure the gas in the goaf in the upper layer of the mine.

5. The mine gas monitoring system for stratified mining according to claim 4, wherein The gas monitoring beam tube also includes a lower layer monitoring beam tube, which is used to be arranged at the working face in the lower layer of the mine to measure the gas in the goaf in the lower layer of the mine.

6. The mine gas monitoring system for stratified mining according to claim 5, characterized in that, The gas monitoring device also includes a nitrogen injection pipeline, which is used to inject nitrogen with a preset flow rate into a preset nitrogen injection position in the mine.

7. The mine gas monitoring system for stratified mining according to claim 6, wherein The signal acquisition device includes a core switch, a backbone switch, a base station, and a routing node. The core switch is connected to the backbone switch through a gigabit industrial Ethernet cable. The backbone switch is connected to the base station through a CAN bus. The base station is connected to the routing node, and the routing node is connected to the wind speed monitoring device and / or the monitoring component.

8. The mine gas monitoring system for stratified mining according to claim 7, characterized in that, It also includes a workstation and a data transmission unit; among them, the workstation is connected to the core switch and is used to analyze the monitoring signal of the wind speed monitoring device and / or the monitoring signal of the monitoring component; the data transmission unit is connected to the workstation and is used to transmit the analysis result of the workstation to a target terminal.

9. The mine gas monitoring system for stratified mining according to claim 8, wherein, The wind speed monitoring device includes A qualitative detector.

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