Coal spontaneous combustion mark gas analysis device

Abstract

The utility model discloses a coal spontaneous combustion marker gas analysis device which comprises a plurality of sampling units, a controller and a gas chromatograph, each sampling unit comprises a gas storage cylinder, a vacuum cavity is arranged in the gas storage cylinder, a sampling part and a detection part are arranged at two opposite ends of the gas storage cylinder, and the sampling part and the detection part are respectively provided with a control valve; the controller is connected to the control valve; and a gas sample input end of the gas chromatograph is connected to the detection part through a pipeline. The analysis device can perform field detection and analysis on coal spontaneous combustion marker gas in a coal seam in a goaf, and can ensure the accuracy of a detection result by performing stratified sampling detection on different depths of the coal seam, and coal mine safety monitoring personnel can obtain coal spontaneous combustion marker gas information of different layers of the coal seam, so that the coal seam safety is improved. The development situation of spontaneous combustion in the coal seam is comprehensively understood, rich and accurate data support is provided for formulating targeted prevention and control measures, and potential safety hazards caused by incomplete mastering of the spontaneous combustion condition of the coal seam are effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of coal mine safety technology, specifically to a coal spontaneous combustion indicator gas analysis device. Background Technology

[0002] During coal mining, goaf areas are formed, leaving behind combustible materials such as residual coal. Under suitable temperatures, these goaf areas can generate self-heating and spontaneous combustion. Spontaneous coal combustion can cause underground fires, and upon contact with methane gas, it can lead to even more serious gas explosions, causing enormous losses to coal mines. Furthermore, the conditions for spontaneous combustion vary from mine to mine; therefore, the detection of spontaneous coal combustion is crucial. For example, Chinese utility model patent CN220381064U discloses a coal spontaneous combustion indicator gas analysis device, specifically including a compressed air storage tank, a coal sample tank, and an experimental platform. The coal sample tank stores coal as a medium, which is heated in a heating chamber to generate spontaneous combustion indicator gases, which are stored in several gas storage tanks for simulation testing on the experimental platform. This allows a chromatographic analyzer to continuously detect multiple samples of spontaneous combustion indicator gases. The operation process is simple and highly efficient.

[0003] However, the coal medium in the coal sample container cannot simulate the real-world coal spontaneous combustion environment during the heating process. For example, coal seams at different depths are affected by external air and moisture to varying degrees, causing the surface coal seam to be easily oxidized, resulting in differences in the test results. Therefore, existing analytical devices cannot effectively monitor the coal spontaneous combustion information of coal seams at different depths in the goaf. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a coal spontaneous combustion indicator gas analysis device to solve the technical problems mentioned in the prior art.

[0005] A coal spontaneous combustion indicator gas analysis device, the analysis device comprising:

[0006] Several sampling units, each sampling unit including a gas storage cylinder, the interior of which is configured as a vacuum chamber, and sampling and detection parts are provided at opposite ends of the gas storage cylinder, each sampling part and the detection part being provided with a control valve, wherein the sampling part is used to be inserted into the coal seam in the goaf to collect coal spontaneous combustion indicator gas.

[0007] A controller, connected to the control valve, is used to control the opening and closing of the control valve;

[0008] A gas chromatograph, wherein the gas sample input end of the gas chromatograph is connected to the detection unit via a pipeline, for real-time detection and analysis of the collected coal spontaneous combustion indicator gas.

[0009] Optionally, at least two sampling units are provided, and the two sampling units are fixed to the depth to be measured in the coal seam of the goaf by a fixing structure, wherein the fixing structure includes:

[0010] The positioning plate has several fixing nails at its bottom and positioning holes of corresponding size at its top for the sampling part of each sampling unit.

[0011] A fixing plate is provided on top of the positioning plate, and the top of the fixing plate is provided with guide holes of corresponding size for the gas storage cylinder of each sampling unit.

[0012] A fixing part is provided on the fixing plate and located on the outer periphery of the guide hole. A locking structure is provided on the side of the fixing part away from the gas storage cylinder. The movable end of the locking structure passes through the fixing part and is connected to any one of a plurality of locking parts arranged along the axial direction on the outer periphery of the gas storage cylinder.

[0013] Optionally, the locking structure includes a fixing rod, which is inserted into or threadedly connected to the locking part.

[0014] Optionally, the outer periphery of the gas storage cylinder is provided with an exhaust port, which is connected to the air inlet of the vacuum pump;

[0015] An exhaust valve is provided at the exhaust port;

[0016] The vacuum pump and the exhaust valve are respectively connected to the controller.

[0017] Optionally, the sampling part is a conical nail with an air intake channel along the axial direction, and the small end of the sampling part is located on the side away from the air storage cylinder.

[0018] Optionally, the air inlet of the sampling section is provided with a filter layer, which is composed of multiple layers of filter screens with different pore sizes stacked together.

[0019] Optionally, the gas chromatograph has a gas distribution plate at its gas sample input end. The gas distribution plate has a hollow internal structure. The gas inlet end of the gas distribution plate is equipped with a gas inlet connector for the detection part of each sampling unit. The gas outlet end of the gas distribution plate is connected to the gas sample input end of the gas chromatograph.

[0020] The beneficial effects that this utility model can produce include:

[0021] This utility model provides a coal spontaneous combustion indicator gas analysis device. Through the design of multiple sampling units and a unique fixing structure, it is used for on-site detection and analysis of coal spontaneous combustion indicator gases in goaf areas. By performing stratified sampling and testing at different depths of the coal seam, the accuracy of the test results can be guaranteed. Furthermore, coal mine safety monitoring personnel can obtain information on coal spontaneous combustion indicator gases at different layers of the coal seam, comprehensively understand the development trend of spontaneous combustion within the coal seam, and provide rich and accurate data support for formulating targeted prevention and control measures. This effectively avoids safety hazards caused by incomplete understanding of coal seam spontaneous combustion. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a coal spontaneous combustion indicator gas analysis device according to the present invention;

[0023] Figure 2 In this utility model Figure 1 A schematic diagram of the internal structure of the sampling unit;

[0024] In the diagram: 1. Gas storage tank, 2. Sampling section, 3. Detection section, 4. Control valve, 5. Gas chromatograph, 6. Positioning plate, 7. Positioning hole, 8. Fixing plate, 9. Guide hole, 10. Fixing part, 11. Fixing rod, 12. Locking part, 13. Exhaust port, 14. Exhaust valve, 15. Vacuum pump, 16. Filter layer, 17. Gas distribution plate, 18. Gas inlet connector, 19. Gas sample input end, 20. Fixing nail. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1As shown, this utility model provides a coal spontaneous combustion marker gas analysis device. The analysis device includes several sampling units, a controller, and a gas chromatograph 5. Each sampling unit includes a gas storage cylinder 1, the interior of which is configured as a vacuum chamber to ensure the purity and integrity of the collected coal spontaneous combustion marker gas. Sampling sections 2 and detection sections 3 are located at opposite ends of the gas storage cylinder 1. Each sampling section 2 and detection section 3 is equipped with a control valve 4. The sampling section 2 is inserted into the coal seam at the desired depth in the goaf area to collect the marker gas released during coal spontaneous combustion, enabling precise detection of the fire source location. The controller is connected to the control valve 4 to control its opening and closing. Specifically, when the control valve 4 of the sampling section 2 is opened, the coal spontaneous combustion marker gas in the coal seam is automatically collected under the negative pressure of the gas storage cylinder 1. After collection, the control valve 4 of the sampling section 2 is closed. The gas sample input end 19 of the gas chromatograph 5 is connected to the detection section 3 via a pipeline, so that when the control valve 4 of the detection section 3 is open, it is used to perform real-time detection and analysis of the collected coal spontaneous combustion marker gas. In the above-mentioned analysis device, the spontaneous combustion marker gas in the coal seam is detected and analyzed on-site in the goaf area. By sampling and testing at different depths of the coal seam, the accuracy of the test results can be guaranteed. Coal mine safety monitoring personnel can obtain information on spontaneous combustion marker gases at different layers of the coal seam, comprehensively understand the development trend of spontaneous combustion inside the coal seam, and provide rich and accurate data support for the formulation of targeted prevention and control measures. This effectively avoids safety hazards caused by incomplete understanding of the spontaneous combustion situation of the coal seam.

[0027] Furthermore, to ensure accurate collection of coal spontaneous combustion marker gases at different depths within the coal seam, at least two sampling units are provided. These two units are fixed to the depth to be measured within the goaf coal seam via a fixing structure, which includes a positioning plate 6, a fixing plate 8, and a fixing part 10. The bottom of the positioning plate 6 is equipped with several fixing nails 20, which act as sturdy "anchors" to firmly secure the positioning plate 6 to the coal seam surface. The top of the positioning plate 6 features positioning holes 7 precisely matched to the size of the sampling part 2 for each sampling unit, ensuring the accuracy of the sampling part 2's installation position. The fixing plate 8 is located on top of the positioning plate 6, and its top also features guide holes 9 of corresponding size for the gas storage cylinder 1 of each sampling unit, providing precise guidance for the installation of the gas storage cylinder 1. The fixing part 10 is located on the fixing plate 8, on the outer periphery of the guide holes 9. A locking structure is installed on the side of the fixing part 10 away from the gas storage cylinder 1. The movable end of the locking structure can pass through the fixing part 10 and connect with any one of the multiple locking parts 12 arranged along the axial direction on the outer periphery of the gas storage cylinder 1. In this way, the gas storage cylinder 1 is firmly fixed in the guide hole 9, thereby successfully inserting the detection part 3 into different depths in the coal seam, greatly improving the accuracy and stability of the gas sampling position. Specifically, the locking structure includes a fixing rod 11, which is fixedly installed to the locking part 12 by a plug-in or threaded connection.

[0028] Furthermore, to improve the purity of the gas collected in the gas storage tank 1, an exhaust port 13 is provided on the outer periphery of the gas storage tank 1, which is connected to the air inlet of the vacuum pump 15; and an exhaust valve 14 is provided at the exhaust port 13; the vacuum pump 15 and the exhaust valve 14 are respectively connected to a controller, which can be a microcontroller. In actual operation, when it is necessary to purify the gas in the gas storage tank 1, the controller controls the exhaust valve 14 to open and simultaneously starts the vacuum pump 15. The vacuum pump 15 operates rapidly, extracting any impurities or residual air that may be present in the gas storage tank 1 through the exhaust port 13, thereby ensuring that the coal spontaneous combustion indicator gas collected in the gas storage tank 1 is purer and providing more reliable data for subsequent detection and analysis. After purification is completed, the controller will promptly close the exhaust valve 14 and stop the operation of the vacuum pump 15 to prevent outside air from re-entering the gas storage tank 1.

[0029] In this embodiment, in order to reduce the cost of use, the exhaust ports 13 of multiple gas storage cylinders 1 can be connected to a main branch pipe through multiple branch pipes, and the exhaust port of the main branch pipe can be connected to the air inlet of the vacuum pump 15, so that one vacuum pump 15 can perform vacuuming operation on the inside of multiple gas storage cylinders 1.

[0030] Furthermore, such as Figure 2As shown, to improve the insertion efficiency and gas collection effect of the sampling unit 2 in the coal seam, the sampling unit 2 is designed as a conical nail with an air inlet channel along the axial direction, and the small end of the sampling unit 2 is located on the side away from the gas storage cylinder 1. This conical design allows the sampling unit 2 to be inserted into the coal seam more smoothly, reducing resistance and quickly reaching the target depth. At the same time, to prevent impurities in the coal seam from entering the air inlet channel during the collection process and affecting gas collection and subsequent detection, a filter layer 16 is carefully set at the air inlet of the sampling unit 2. This filter layer 16 is composed of multiple layers of filter screens with different pore sizes stacked together, which can filter the incoming gas from large to small, effectively blocking various impurities and ensuring that only pure coal spontaneous combustion indicator gas can enter the gas storage cylinder 1, greatly improving the quality and reliability of gas collection.

[0031] In the above description, the gas sample input terminal 19 of the gas chromatograph 5 is connected to the detection unit 3 of the sampling unit via a specially designed pipeline, which can be made of polytetrafluoroethylene (PTFE). During the detection process, the collected coal spontaneous combustion indicator gas originates from the detection unit 3 of the gas storage tank 1 and enters the gas chromatograph 5 in an orderly manner along the pipeline. The gas chromatograph 5 utilizes advanced chromatographic separation technology and highly sensitive detection methods to accurately separate and quantitatively analyze various components in the mixed gas. Figure 1 As shown, to further improve detection efficiency and accuracy, the gas sample input end 19 of the gas chromatograph 5 is also equipped with a gas distribution plate 17. The gas distribution plate 17 has a hollow internal structure, and its inlet end is equipped with a dedicated inlet connector 18 for each sampling unit's detection section 3, ensuring that the gases collected by multiple sampling units can be systematically gathered into the gas distribution plate 17, enabling multi-point synchronous detection or single-point sequential detection. The outlet end of the gas distribution plate 17 is closely connected to the gas sample input end 19 of the gas chromatograph 5, achieving efficient gas transmission and accurate detection. Through the precise detection of the gas chromatograph 5, key information such as the composition and concentration of coal spontaneous combustion indicator gases can be quickly and accurately obtained, providing timely and reliable decision-making basis for coal mine safety monitoring personnel.

Claims

1. A coal spontaneous combustion indicator gas analysis device, characterized in that, The analytical apparatus includes: Several sampling units, each sampling unit includes a gas storage cylinder (1), the interior of which is configured as a vacuum chamber, and sampling parts (2) and detection parts (3) are provided at opposite ends of the gas storage cylinder (1). The sampling parts (2) and the detection parts (3) are respectively provided with control valves (4) for controlling the connection between the sampling parts (2) and the detection parts (3) and the gas storage cylinder (1). The sampling parts (2) are used to be inserted into the coal seam in the goaf area to collect coal spontaneous combustion indicator gas. A controller is connected to the control valve (4) and is used to control the opening and closing of the control valve (4); A gas chromatograph (5) is provided, with its gas sample input terminal (19) connected to the detection unit (3) via a pipeline, for real-time detection and analysis of the collected coal spontaneous combustion indicator gas.

2. The coal spontaneous combustion indicator gas analysis device according to claim 1, characterized in that, At least two sampling units are provided, and the two sampling units are fixed to the sampling part (2) at the depth to be measured in the coal seam of the goaf by a fixing structure, wherein the fixing structure includes: Positioning plate (6), the bottom of the positioning plate (6) is provided with a number of fixing nails (20), and the top of the positioning plate (6) is provided with positioning holes (7) of corresponding size for the sampling part (2) of each sampling unit. A fixing plate (8) is provided on the top of the positioning plate (6). The top of the fixing plate (8) is provided with a guide hole (9) of a corresponding size for the gas storage cylinder (1) of each sampling unit. A fixing part (10) is provided on the fixing plate (8) and located on the outer periphery of the guide hole (9). A locking structure is provided on the side of the fixing part (10) away from the gas storage cylinder (1). The movable end of the locking structure passes through the fixing part (10) and is connected to any one of the multiple locking parts (12) provided along the axial direction on the outer periphery of the gas storage cylinder (1).

3. The coal spontaneous combustion indicator gas analysis device according to claim 2, characterized in that, The locking structure includes a fixing rod (11), which is inserted into or threadedly connected to the locking part (12).

4. The coal spontaneous combustion indicator gas analysis device according to claim 1, characterized in that, The outer periphery of the gas storage cylinder (1) is provided with an exhaust port (13), which is connected to the air inlet of the vacuum pump (15). An exhaust valve (14) is provided at the exhaust port (13); The vacuum pump (15) and the exhaust valve (14) are respectively connected to the controller.

5. The coal spontaneous combustion indicator gas analysis device according to claim 1, characterized in that, The sampling part (2) is a conical nail with an air intake channel along the axial direction, and the small end of the sampling part (2) is located on the side away from the air storage cylinder (1).

6. The coal spontaneous combustion indicator gas analysis device according to claim 1, characterized in that, The air inlet of the sampling unit (2) is provided with a filter layer (16), which is composed of multiple layers of filter screens with different pore sizes stacked together.

7. The coal spontaneous combustion indicator gas analysis device according to claim 1, characterized in that, The gas chromatograph (5) has a gas distribution plate (17) at its gas sample input end (19). The gas distribution plate (17) has a hollow structure inside. The gas inlet end of the gas distribution plate (17) is equipped with a gas inlet connector (18) for the detection part (3) of each sampling unit. The gas outlet end of the gas distribution plate (17) is connected to the gas sample input end (19) of the gas chromatograph (5).

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