A gas extraction and detection device for coal mine shale formations

Abstract

This utility model belongs to the field of coal mine safety mining technology, specifically disclosing a gas extraction and detection device for shale formations in coal mines. The device includes extraction pipelines, a detection unit, and a sampling and recovery unit. Multiple extraction pipelines are provided, with the inlet end of each pipeline extending into the interior of a borehole. The outlet end of each pipeline is connected to the detection unit, which provides power to extract and detect the gas. The outlet end of the detection unit is connected to the sampling and recovery unit, which is used to sample, retain, and recover shale gas. This utility model device has multiple extraction pipelines and uses a micro-vacuum pump to provide power to extract gas from inside the borehole, drawing shale gas to the detection unit for detection. The gas detector can detect the composition and concentration of the gas, providing accurate data for evaluating the extraction effect and determining optimal extraction parameters.

Description

Technical Field

[0001] This utility model relates to the field of coal mine safety mining technology, specifically to a gas extraction and detection device for coal mine shale formations. Background Technology

[0002] During coal mining, shale formations are characterized by low permeability and high adsorption. Disturbance during tunnel excavation can easily lead to abnormal shale gas outbursts. If extraction is not timely or detection is inaccurate, gas concentrations in the working face and return airway can exceed limits, potentially causing explosions and poisoning accidents. Furthermore, the effectiveness of shale gas extraction directly impacts the stability of the surrounding rock and the safety of subsequent mining operations. Therefore, precise detection and evaluation of extraction efficiency are necessary to determine the optimal extraction radius and time to achieve the required extraction level.

[0003] However, the current detection of gas concentration and pressure parameters in coal mine boreholes mainly relies on manual portable inspections. The relevant parameters of a single borehole are measured manually, and then the measurement is moved to the next borehole to detect the gas-related parameters. However, due to the large number of boreholes in coal mines, the manpower consumption is huge, and the accuracy and real-time performance of the data are poor.

[0004] Therefore, this utility model proposes a gas extraction and detection device for shale formations in coal mines. Utility Model Content

[0005] The purpose of this invention is to provide a gas extraction and detection device for shale formations in coal mines. This device can achieve effective extraction and accurate detection of shale gas, ensuring safe mining operations in coal mines.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: A gas extraction and detection device for coal mine shale formations includes an extraction pipeline, a detection unit, and a sampling and recovery unit; The extraction pipeline is provided in multiple ways, wherein the air inlet of each extraction pipeline extends into the interior of a borehole, and the air outlet of each extraction pipeline is connected to the detection unit. The detection unit includes a fixed housing, a miniature vacuum pump, and a gas detector, wherein the miniature vacuum pump and the gas detector are both located inside the fixed housing; The outlet of the extraction pipeline is connected to the inlet of the micro vacuum pump, the outlet of the micro vacuum pump is connected to the inlet of the gas detector, and the outlet of the gas detector is connected to the sampling and recovery unit. The sampling and recovery unit is used to sample, retain, and recover shale gas.

[0007] Preferably, the side wall of the fixed housing is provided with a manifold, the outlet end of the manifold is connected to the inlet end of the micro vacuum pump, the inlet end of the manifold is provided with multiple inlet connectors, wherein the outlet end of each extraction pipeline is connected to a corresponding inlet connector, and each inlet connector is provided with a solenoid valve. The detection unit also includes a controller, and the control terminals of the solenoid valve, the micro vacuum pump, and the gas detector are connected to the controller via data cables.

[0008] Preferably, the extraction pipeline is provided with a pipeline outlet and a pipeline inlet, the pipeline outlet is connected to the gas inlet of the gas meter, and the gas outlet of the gas meter is connected to the pipeline inlet.

[0009] Preferably, a first shut-off valve is provided on the extraction pipeline, wherein the first shut-off valve is located between the gas outlet and the gas inlet of the pipeline.

[0010] Preferably, a warning light and a display screen are provided on the side wall of the fixed housing, wherein the warning light and the display screen are both connected to the controller.

[0011] Preferably, the sampling and recovery unit includes a buffer tank, a sampling cylinder, and a waste gas storage tank; The gas detector's outlet is connected to the buffer tank's inlet, the buffer tank's outlet is connected to the sampling cylinder's inlet via a first gas supply line, the sampling cylinder's outlet is connected to the waste gas storage tank via a second gas supply line, and the buffer tank's outlet is connected to the waste gas storage tank via a third gas supply line.

[0012] Preferably, a second shut-off valve is provided on the third gas pipeline.

[0013] Preferably, both ends of the sampling cylinder are equipped with switch valves.

[0014] Preferably, the waste gas storage tank is equipped with a gas overflow detector.

[0015] Preferably, both the buffer tank and the waste gas storage tank are equipped with pressure gauges.

[0016] The beneficial effects of this utility model are as follows: This invention discloses a gas extraction and detection device for shale formations in coal mines. The device comprises multiple extraction pipelines and utilizes a micro-vacuum pump to power the extraction of gas from the borehole. The gas is then drawn to a gas detector for analysis. This gas detector accurately detects the gas composition and concentration, providing precise data for evaluating extraction effectiveness and determining optimal extraction parameters. This invention enables simultaneous extraction from multiple locations, improving extraction efficiency and ensuring comprehensive shale gas collection. Furthermore, the use of a manifold fixed to the side wall of the outer casing and multiple air inlet connectors, along with solenoid valves, allows for flexible control of gas flow from different extraction pipelines into the detection unit, facilitating gas detection in specific boreholes or areas. By connecting a controller to the solenoid valves, micro-vacuum pump, and gas detector, this invention achieves automated control and data transmission, enhancing the device's intelligence level. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall connection of this utility model; Figure 2 This is a schematic diagram of the extraction pipeline of this utility model; Figure 3 This is a schematic diagram of the detection unit of this utility model; Figure 4 This is a schematic diagram of the sampling and recovery unit of this utility model; Figure 5 This is a schematic diagram of the drilling process of this utility model; Among them, 1-extraction pipeline, 11-pipeline outlet, 12-pipeline inlet, 13-first shut-off valve, 14-gas meter; 2-Detection Unit: 21-Fixed Housing, 22-Manifold, 221-Inlet Connector, 23-Miniature Vacuum Pump, 24-Gas Detector, 25-Controller, 26-Display Screen, 27-Warning Light; 3-Sampling and recovery unit: 31-Buffer tank, 311-Pressure regulating valve; 32-Sampling cylinder, 321-Switch valve; 33-Waste gas storage tank, 331-Gas overflow detector, 332-Pressure gauge; 341-First gas supply line, 342-Second gas supply line, 343-Third gas supply line, 344-Second shut-off valve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Combination Figures 1 to 5 As shown, this utility model proposes a gas extraction and detection device for shale formations in coal mines. This device can achieve effective extraction and accurate detection of shale gas, ensuring safety during coal mining. The gas extraction and detection device mainly includes structural components such as an extraction pipeline 1, a detection unit 2, and a sampling and recovery unit 3.

[0021] It should be noted that, in order to achieve advance extraction of shale gas-rich areas during shale tunnel excavation, borehole locations are selected along the bottom of the tunnel wall during the tunnel excavation process. A directional drilling rig is then used to drill at these locations according to the following... Figure 5 The drilling parameters shown are based on conventional parameters used by the mine for drilling through the shale layer.

[0022] Combination Figure 1 As shown, the extraction pipeline 1 is responsible for extracting shale gas from the borehole. There are multiple extraction pipelines 1, with the inlet end of each extraction pipeline 1 extending into the interior of a corresponding borehole, and the outlet end of each extraction pipeline 1 connected to the detection unit 2. This design enables multi-point gas extraction, and the outlet end of each extraction pipeline 1 is connected to the detection unit 2 to ensure that the extracted gas can smoothly enter the detection stage.

[0023] Combination Figure 1 and Figure 2 As shown, the extraction pipeline 1 has a gas outlet 11 and a gas inlet 12. The gas outlet 11 is connected to the inlet of the gas meter 14, and the outlet of the gas meter 14 is connected to the gas inlet 12. The gas meter 14 installed on the extraction pipeline 1 can accurately measure the flow rate of shale gas extracted through the extraction pipeline 1, thus providing accurate flow data support for subsequent gas detection and analysis. At the same time, a first shut-off valve 13 is installed on the extraction pipeline 1, located between the gas outlet 11 and the gas inlet 12. This design ensures that the first shut-off valve 13 will not affect the gas meter 14's detection of shale gas flow rate, guaranteeing the accuracy of the detection results. It can also effectively control the gas flow in the extraction pipeline 1, and can promptly cut off the gas supply when maintenance or extraction needs to be stopped, ensuring the safety and stability of the equipment operation.

[0024] Combination Figure 3 As shown, the detection unit 2 mainly includes a fixed housing 21, a miniature vacuum pump 23, and a gas detector 24, both of which are housed inside the fixed housing 21. The outlet of the extraction pipeline 1 is connected to the inlet of the miniature vacuum pump 23, the outlet of the miniature vacuum pump 23 is connected to the inlet of the gas detector 24, and the outlet of the gas detector 24 is connected to the sampling and recovery unit 3.

[0025] Specifically, a manifold 22 is provided on the side wall of the fixed housing 21. The outlet of the manifold 22 is connected to the inlet of the micro vacuum pump 23. The inlet of the manifold 22 is provided with multiple inlet connectors 221, and the outlet of each extraction pipeline 1 is connected to a corresponding inlet connector 221. Each inlet connector 221 is equipped with a solenoid valve. This design allows the gas extracted from multiple extraction pipelines 1 to enter the detection unit 2 through the manifold 22. Furthermore, the solenoid valves can be controlled to select which extraction pipeline 1 needs to be detected to enter the gas detector 24 individually, improving the flexibility and targeting of the detection.

[0026] Combination Figure 3 As shown, the detection unit 2 also includes a controller 25, which is connected to the control terminals of the solenoid valve, the miniature vacuum pump 23, and the gas detector 24 via data cables. The controller 25 enables automatic opening and closing of the solenoid valve, starting and stopping of the miniature vacuum pump 23, and data acquisition and processing of the gas detector 24, making the entire detection process more intelligent and automated.

[0027] Combination Figure 3 As shown, a warning light 27 and a display screen 26 are installed on the side wall of the fixed housing 21. Both the warning light 27 and the display screen 26 are connected to the controller 25. When the gas detector 24 detects abnormal conditions such as excessive gas concentration, the controller 25 will control the warning light 27 to light up, reminding the staff to take timely measures; at the same time, the display screen 26 can display the gas detection data in real time, making it convenient for the staff to understand the gas situation at any time.

[0028] Combination Figure 4 As shown, the sampling and recovery unit 3 mainly includes a buffer tank 31, a sampling cylinder 32, and a waste gas storage tank 33. The outlet of the gas detector 24 is connected to the inlet of the buffer tank 31. The outlet of the buffer tank 31 is connected to the inlet of the sampling cylinder 32 via a first gas supply line 341. The outlet of the sampling cylinder 32 is connected to the waste gas storage tank 33 via a second gas supply line 342. The outlet of the buffer tank 31 is connected to the waste gas storage tank 33 via a third gas supply line 343. The buffer tank 31 buffers and stabilizes the pressure of the gas exiting the gas detector 24, allowing the gas to smoothly enter the sampling cylinder 32 for sampling. Figure 4As shown, both ends of the sampling cylinder 32 are equipped with switch valves, which facilitates the staff to control the gas inlet and outlet of the sampling cylinder 32 and to carry out accurate sampling operations.

[0029] Combination Figure 4 As shown, a gas overflow detector 331 is installed on the waste gas storage tank 33, which can monitor in real time whether there is gas overflow in the waste gas storage tank 33 to prevent safety accidents. Both the buffer tank 31 and the waste gas storage tank 33 are equipped with pressure gauges 332, which can intuitively display the pressure inside the tank, making it easy for operators to understand the operating status of the device.

[0030] Combination Figure 4 As shown, a pressure regulating valve 311 is provided on the buffer tank 31. The pressure regulating valve 311 can adjust the gas pressure entering the buffer tank 31 according to actual needs, so as to ensure that the gas pressure entering the buffer tank 31 is stable within a suitable range, and avoid adverse effects on subsequent sampling, storage and other processes due to excessively high or low pressure.

[0031] Combination Figure 4 As shown, a second shut-off valve 344 is installed on the third gas supply pipeline 343. By controlling the opening and closing of the second shut-off valve 344, it is possible to control whether the gas in the buffer tank 31 enters the waste gas storage tank 33, further ensuring the safety and reliability of the device operation. When gas sampling begins, the second shut-off valve 344 is opened to purge impurities from the device and transport the gas through the third gas supply pipeline 343 to the waste gas storage tank 33 before gas sampling begins, ensuring the accuracy of the sampling results.

[0032] In summary, this invention proposes a gas extraction and detection device for shale formations in coal mines. The device is equipped with multiple extraction pipelines. A micro vacuum pump 23 provides power to extract gas from inside the borehole, which is then drawn to a gas detector 24 for detection. The gas detector 24 can accurately detect the composition and concentration of the gas, providing accurate data for evaluating extraction effectiveness and determining optimal extraction parameters. This invention enables simultaneous extraction from multiple locations, improving extraction efficiency and ensuring comprehensive collection of shale gas. Furthermore, by using a manifold 22 fixed to the side wall of the outer casing 21 and multiple air inlet connectors 221 in conjunction with solenoid valves, the gas from different extraction pipelines 1 can be flexibly controlled to enter the detection unit 2, facilitating individual detection of gas in specific boreholes or areas. By connecting a controller 25 to the solenoid valves, micro vacuum pump 23, and gas detector 24, this invention achieves automated control and data transmission, improving the device's intelligence level.

[0033] Of course, the above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model and should be protected by the present utility model.

Claims

1. A gas extraction and detection device for shale formations in coal mines, characterized in that, Includes extraction pipelines, detection units, and sampling recovery units; The extraction pipeline is provided in multiple ways, wherein the air inlet of each extraction pipeline extends into the interior of a borehole, and the air outlet of each extraction pipeline is connected to the detection unit. The detection unit includes a fixed housing, a miniature vacuum pump, and a gas detector, wherein the miniature vacuum pump and the gas detector are both located inside the fixed housing; The outlet of the extraction pipeline is connected to the inlet of the micro vacuum pump, the outlet of the micro vacuum pump is connected to the inlet of the gas detector, and the outlet of the gas detector is connected to the sampling and recovery unit. The sampling and recovery unit is used to sample, retain, and recover shale gas.

2. The gas extraction and detection device for coal mine shale formations according to claim 1, characterized in that, The side wall of the fixed housing is provided with a manifold, the outlet of the manifold is connected to the inlet of the micro vacuum pump, and the inlet of the manifold is provided with multiple inlet connectors. The outlet of each extraction pipeline is connected to a corresponding inlet connector, and each inlet connector is provided with a solenoid valve. The detection unit also includes a controller, and the control terminals of the solenoid valve, the micro vacuum pump, and the gas detector are connected to the controller via data cables.

3. The gas extraction and detection device for coal mine shale formations according to claim 2, characterized in that, Warning lights and a display screen are provided on the side wall of the fixed housing. The control terminals of the warning lights and the display screen are connected to the controller via data cables.

4. The gas extraction and detection device for coal mine shale formations according to claim 1, characterized in that, The extraction pipeline is provided with a pipeline outlet and a pipeline inlet. The pipeline outlet is connected to the gas inlet of the gas meter, and the gas outlet of the gas meter is connected to the pipeline inlet.

5. The gas extraction and detection device for coal mine shale formations according to claim 4, characterized in that, A first shut-off valve is installed on the extraction pipeline, wherein the first shut-off valve is located between the gas outlet and the gas inlet of the pipeline.

6. The gas extraction and detection device for coal mine shale formations according to claim 1, characterized in that, The sampling and recovery unit includes a buffer tank, a sampling cylinder, and a waste gas storage tank. The gas detector's outlet is connected to the buffer tank's inlet, the buffer tank's outlet is connected to the sampling cylinder's inlet via a first gas supply line, the sampling cylinder's outlet is connected to the waste gas storage tank via a second gas supply line, and the buffer tank's outlet is connected to the waste gas storage tank via a third gas supply line.

7. The gas extraction and detection device for coal mine shale formations according to claim 6, characterized in that, A second shut-off valve is installed on the third gas pipeline.

8. The gas extraction and detection device for coal mine shale formations according to claim 6, characterized in that, Both ends of the sampling cylinder are equipped with switch valves.

9. The gas extraction and detection device for coal mine shale formations according to claim 6, characterized in that, The waste gas storage tank is equipped with a gas overflow detector.

10. The gas extraction and detection device for coal mine shale formations according to claim 6, characterized in that, Pressure gauges are installed on both the buffer tank and the waste gas storage tank.

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