A coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device

Abstract

The present invention relates to a coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device, which belongs to the field of coal mines. It includes a coal sample crushing and blocking prevention system, a gas filtering and drying system and a gas gas volume data collector; the coal sample crushing and blocking prevention system includes a sealed crusher, a gas collecting pipe connected to the crusher and an anti-blocking mechanism arranged in the gas collecting pipe for preventing coal powder from blocking, and the crusher is provided with a crusher for crushing coal samples; the gas filtering and drying system includes a sealed gas collecting bottle, the gas collecting bottle is connected to the gas collecting pipe, and the gas collecting bottle is filled with filtrate to filter the coal powder in the gas from the gas collecting pipe; the gas collecting bottle is also connected to a gas outlet duct, and a solid desiccant and a gas flow meter are arranged in sequence along the flow direction of the gas outlet duct, and the gas flow meter is connected to the gas gas volume data collector. Reduce the gas loss during the crushing process, remove impurities in the gas, and improve the test accuracy and data reliability.

Description

Technical Field

[0001] The invention belongs to the field of coal mines and relates to a coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device. Background Art

[0002] Gas is one of the major disasters and safety hazards in coal mines. Gas prevention and control in the process of coal mining is the top priority to ensure safe production in coal mines. Since parameters such as the gas content of coal seams are essential parameters required by various technical methods in the process of gas prevention and control, obtaining effective basic parameters of original coal seam gas through different technical methods can provide a basis for ensuring the normal progress of gas prevention and control work, promoting efficient and safe production in coal mines, and the implementation of various technical methods for gas prevention and control work.

[0003] In order to accurately obtain the gas content parameters of coal seams, some researchers have proposed a method combining ground desorption and underground desorption to obtain the original gas content of coal seams through theoretical research and mine field conditions. The method includes two processes: underground desorption and ground crushing desorption. During underground desorption, the valve of the sealed coal sample tank is opened to discharge the desorbable gas in the coal sample tank, and the amount of desorbable gas underground is obtained by drainage method; during ground crushing desorption, part of the desorbable gas in the coal is released when the coal sample is fully crushed in the crusher, and the desorbable gas content in the coal sample crushing desorption process is obtained by recording through relevant instruments. However, the test data of the current equipment used for ground crushing desorption of gas is not accurate enough, and it is easy to cause coal powder blockage. In addition, the data is observed by naked eyes during the test process, which has large errors. With the gradual increase in the mining depth of coal mines in my country, mine gas control is becoming more and more urgent. It is of great significance to effectively reduce the error of coal seam gas parameter test data, improve the efficiency of parameter determination, and increase data accuracy, which is of great significance for more effective guidance of mine gas prevention and control work. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a coal seam crushing and desorption gas anti-blocking and desorption amount automatic metering device to solve the current coal seam crushing and desorption gas test data accuracy problem of low rate.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A coal seam crushing and desorption gas blockage prevention and desorption amount automatic metering device, including a coal sample crushing and blocking prevention system, a gas filtering and drying system and a gas gas volume data collector; the coal sample crushing and blocking prevention system includes a sealed crusher, a gas collecting pipe connected to the crusher and an anti-blocking mechanism arranged in the gas collecting pipe for preventing coal powder from blocking, and the crusher is provided with a crusher for crushing coal samples; the gas filtering and drying system includes a sealed gas collecting bottle, the gas collecting bottle is connected to the gas collecting pipe, and the gas collecting bottle is filled with filtrate to filter the coal powder in the gas from the gas collecting pipe; the gas collecting bottle is also connected to a gas outlet duct, and a solid desiccant and a gas flow meter are arranged in sequence along the flow direction of the gas outlet duct, and the gas flow meter is connected to the gas volume data collector.

[0007] Furthermore, the anti-blocking mechanism includes an anti-blocking striker, which includes a center rod and outer edges distributed on the surface of the center rod, and one end of the center rod is hinged to the air collecting pipe through a hinge.

[0008] Furthermore, the head of the gas collecting pipe has more than two gas collecting channels connected to the pulverizer, and the gas collecting channels are connected with communication channels, and anti-blocking striker pins are correspondingly arranged in the gas collecting channels; the hinge passes through the communication channel and is hinged to the central rod of each anti-blocking striker.

[0009] Furthermore, it also includes a gas volume calibration system, which includes a sealed calibrator, a U-shaped tube is provided in the calibrator, and the U-shaped tube is filled with calibration liquid, one end of the U-shaped tube is connected to the gas outlet duct of the gas collecting bottle, and the other end is connected to the gas outlet pipe; the U-shaped tube is provided with an electronic liquid level meter for recording the height difference of the liquid column at both ends of the U-shaped tube, and the electronic liquid level meter is connected to the gas volume data acquisition instrument.

[0010] Furthermore, one end of the U-shaped tube is connected to the gas outlet conduit of the gas collecting bottle through an air inlet pipe, and an air inlet valve is provided on the air inlet pipe; and an air outlet valve is provided on the air outlet pipe.

[0011] Furthermore, the electronic liquid level meter and the air outlet pipe are arranged at the same end of the U-shaped tube.

[0012] Furthermore, the gas collecting bottle and the gas outlet duct are both transparent; the gas collecting bottle is connected to a transparent gas inlet duct, and the gas inlet duct is connected to the gas collecting pipe through a sealing rubber hose.

[0013] Furthermore, the air collecting pipe is in sealed communication with the pulverizer through a threaded buckle.

[0014] Further, the pulverizer includes a pulverizer chamber and a cover plate sealingly covering an opening of the pulverizer chamber.

[0015] The beneficial effects of the present invention are:

[0016] (1) The present invention optimizes the design of an anti-blocking mechanism in the gas collecting pipe to prevent the coal powder produced by the crushing from adhering to the inner wall of the pipe and causing blockage, thereby ensuring that the gas released during the crushing process enters the gas collecting pipe smoothly as quickly as possible, reducing gas loss and improving test accuracy and data reliability.

[0017] (2) The present invention uses a gas filtering and drying system to remove impurities in the gas, improve the purity of the gas, further reduce test errors, ensure data reliability, and provide an effective basis for accurately calculating the original gas content of the coal seam.

[0018] (3) The present invention adopts a gas volume calibration system, uses an electronic liquid level meter to record the height difference change of the liquid column at both ends of the U-tube in the presence or absence of gas, cooperates with a gas volume data acquisition instrument to calculate the desorbed gas amount, compares it with the relevant parameters obtained by the gas flow meter, and calibrates and corrects it to further improve the data accuracy.

[0019] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 It is a structural schematic diagram of a coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the anti-blocking mechanism.

[0023] Figure numerals: cover plate 1, pulverizer chamber 2, gas collecting pipe 3, gas collecting channel 3a, communication channel 3b, threaded thread 4, anti-blocking pin 5, center rod 5a, outer edge 5b, support screw 6, hinge 7, hinge shaft 7a, hinge rod 7b, sealing hose 8, air inlet duct 9, gas collecting bottle 10, air outlet duct 11, solid desiccant 12, gas flow meter 13, calibrator 14, air inlet pipe 15, air inlet valve 16, electronic liquid level meter 17, air outlet valve 18, air outlet pipe 19, data cable 20, gas volume data collector 21. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] See also Figure 1-2 , which is a coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device, including a coal sample crushing and blocking prevention system, a gas filtering and drying system, a gas volume calibration system and a gas volume data acquisition instrument 21.

[0028] The coal sample crushing and anti-blocking system includes a sealed crusher, a gas collecting pipe 3 connected to the crusher, and an anti-blocking mechanism arranged in the gas collecting pipe 3 to prevent coal powder from clogging. A crusher for crushing coal samples is arranged in the crusher.

[0029] The pulverizer includes a pulverizer chamber 2 and a cover plate 1. The cover plate 1 covers the upper opening of the pulverizer chamber 2. A rubber pad is provided on the lower surface of the cover plate 1 to seal the pulverizer chamber 2. The head of the gas collecting pipe 3 has two gas collecting channels 3a. A communication channel 3b is connected between the two gas collecting channels 3a. The two gas collecting channels 3a are sealed and connected to the cover plate 1 of the pulverizer through threaded screws 4, and are connected to the pulverizer chamber 2.

[0030] The anti-blocking mechanism includes two anti-blocking strikers 5, which are arranged in the gas collecting channel 3a in a one-to-one correspondence. The anti-blocking striker 5 includes a central rod 5a and an outer edge 5b distributed on the surface of the central rod 5a; one end of the central rod 5a of the two anti-blocking strikers 5 is respectively hinged to the hinge rod 7b of the hinge 7, and the hinge rods 7b connected to the two anti-blocking strikers 5 are respectively connected to the hinge shaft 7a, and the two sections of the hinge shaft 7a are connected through the communication channel 3b, and the hinge rod 7b and the hinge shaft 7a form a hinge 7, and are fixed in the gas collecting pipe 3 by the support screw 6.

[0031] The gas filtering and drying system includes a sealed gas collecting bottle 10, which is made of transparent glass. The gas collecting bottle 10 is connected to an air inlet duct 9 made of transparent glass, and the air inlet duct 9 is connected to the gas collecting pipe 3 through a sealing hose 8; the gas collecting bottle 10 is filled with filtrate (the filtrate in this embodiment is water) to filter impurities such as coal powder in the gas from the gas collecting pipe 3; the gas collecting bottle 10 is also connected to an air outlet duct 11 made of transparent glass, and a solid desiccant 12 and a gas flow meter 13 are sequentially arranged along the flow direction of the air outlet duct 11, and the gas flow meter 13 is connected to a gas volume data acquisition instrument 21 through a data line 20.

[0032] The gas volume calibration system includes a sealed calibrator 14, in which a U-shaped tube is provided. The U-shaped tube is filled with a calibration liquid (the calibration liquid in this embodiment is water). One end of the U-shaped tube is connected to the gas outlet duct 11 of the gas collecting bottle 10 through an air inlet pipe 15, and an air inlet valve 16 is provided on the air inlet pipe 15. The other end is connected to an air outlet pipe 19, and an air outlet valve 18 is provided on the air outlet pipe 19. An electronic liquid level meter 17 for recording the height difference of the liquid column at both ends of the U-shaped tube is provided at the same end as the air outlet pipe 19. The electronic liquid level meter 17 is connected to the gas volume data acquisition instrument 21 through a data line 20.

[0033] The working principle of the device is:

[0034] The method for testing the desorbable gas content in the coal sample crushing and desorption process using the device comprises the following steps:

[0035] S1.Preparation:

[0036] Coal sample preparation: According to the requirements of GB / T23250-2009, select coal samples with a particle size of about 25 mm, use a balance to weigh two equal amounts of coal samples (100g to 300g each) and record the weight of the coal samples;

[0037] Assemble the device and test the air tightness: Assemble the device, seal each pipeline, check the pipeline connectivity, open the threaded buckle 44, inject a certain amount of nitrogen into the gas collecting pipe 3, and the nitrogen finally enters the calibrator 14 along the pipelines, so that the liquid columns at both ends of the U-shaped tube have a certain height difference, screw on the threaded buckle 44 to seal the gas collecting pipe 3, observe whether the liquid level changes for a certain period of time (such as 5 minutes), and test the air tightness of the device.

[0038] S2. Group test coal sample crushing and desorption gas quantity:

[0039] Place one of the coal samples in the pulverizer chamber 2 and seal it with the cover plate 1, open the gas volume data acquisition instrument 21 to read the initial value, and open the air inlet valve 16 and the air outlet valve 18 at the same time. After the liquid columns at both ends of the U-shaped tube are stable, the electronic liquid level meter 17 records the height difference of the liquid columns at both ends of the U-shaped tube and transmits it to the gas volume data acquisition instrument 21;

[0040] The pulverizer in the pulverizer chamber 2 is turned on to pulverize the coal sample. The gas released during the pulverization process enters the gas collecting pipe 3. At the same time, the pulverizer vibrates during the pulverization process, and the gas collecting pipe 3 vibrates in conjunction with it. The anti-blocking striker 5 generates up and down vibrations of different frequencies with the gas collecting pipe 3 under the action of its own gravity, so that the coal powder that enters the gas collecting pipe 3 and adheres to the inner wall of the gas collecting pipe 3 during the pulverization process driven by the gas falls back to the pulverizer to prevent the gas collecting pipe 3 from being blocked; the gas in the gas collecting pipe 3 enters the gas collecting bottle 10 along the sealing rubber hose 8 and the air inlet duct 9, and the impurities such as coal powder contained in the gas are filtered out by the filtrate in the gas collecting bottle 10; the filtered gas enters the solid desiccant 12 along the air outlet duct 11 for drying, and then the flow data is recorded by the gas flowmeter 13 and transmitted to the gas volume data acquisition instrument 2121 to obtain the gas volume and calculate the desorbed gas amount;

[0041] The gas flowing through the gas flow meter 13 further enters the calibrator 14 through the air inlet pipe 15, causing the height difference of the liquid column at both ends of the U-shaped tube to change. After stabilization, the height difference of the liquid column at both ends of the U-shaped tube is recorded again by the electronic liquid level meter 17 and transmitted to the gas volume data acquisition instrument 21. Through the two height difference changes, the gas volume entering the calibrator 14 is calculated and compared with the gas volume obtained by the gas flow meter 13, and finally the accurate desorbed gas volume is obtained;

[0042] Turn off the pulverizer, open the pulverizer, take out the pulverized coal powder, and sieve the coal powder with a 60-mesh sieve. If more than 95% of the coal powder can pass the sieve, it means that the test is qualified;

[0043] Repeat the above steps to test the amount of gas desorbed by crushing another coal sample.

[0044] S3. Comparative analysis

[0045] Tests are conducted on two groups of coal samples with the same particle size and weight, and the amount of desorbed gas produced after the two groups of coal samples are crushed is compared. If the error between the two groups of test data is ≤10%, it indicates that the two groups of tests are valid and the data are reasonable; if the error between the two groups of test data is >10%, the coal samples should be re-prepared for testing.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device, characterized by: It includes a coal sample crushing and anti-blocking system, a gas filtering and drying system and a gas gas volume data collector; the coal sample crushing and anti-blocking system includes a sealed crusher, a gas collecting pipe connected to the crusher and an anti-blocking mechanism arranged in the gas collecting pipe to prevent coal powder from being blocked, and the crusher is provided with a crusher for crushing coal samples; the gas filtering and drying system includes a sealed gas collecting bottle, which is connected to the gas collecting pipe and filled with filtrate to filter coal powder in the gas from the gas collecting pipe; the gas collecting bottle is also connected to a gas outlet duct, and a solid desiccant and a gas flow meter are arranged in sequence along the flow direction of the gas outlet duct, and the gas flow meter is connected to the gas gas volume data collector; the anti-blocking mechanism includes an anti-blocking striker, and the anti-blocking striker includes a center rod and outer edges distributed on the surface of the center rod, and one end of the center rod is hinged to the gas collecting pipe by a hinge; Turn on the pulverizer in the pulverizer room to pulverize the coal sample. The gas released during the pulverizing process enters the gas collecting pipe. The pulverizer vibrates during the pulverizing process, and the gas collecting pipe vibrates in conjunction with it. The anti-blocking impactor vibrates up and down with the gas collecting pipe at different frequencies under the action of its own gravity, so that the coal powder that enters the gas collecting pipe and adheres to the inner wall of the gas collecting pipe during the pulverizing process driven by the gas will fall back to the pulverizer to prevent the gas collecting pipe from being blocked.

2. The coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device according to claim 1 is characterized by: The head of the gas collecting pipe has more than two gas collecting channels connected to the pulverizer, and the gas collecting channels are connected with a communication channel, and anti-blocking striker pins are correspondingly arranged in the gas collecting channels; the hinge passes through the communication channel and is hinged to the central rod of each anti-blocking striker pin.

3. The coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device according to claim 1 is characterized by: It also includes a gas volume calibration system, which includes a sealed calibrator, a U-shaped tube is provided in the calibrator, and a calibration liquid is filled in the U-shaped tube, one end of the U-shaped tube is connected to the gas outlet duct of the gas collecting bottle, and the other end is connected to the gas outlet pipe; an electronic liquid level meter is provided in the U-shaped tube for recording the height difference of the liquid column at both ends of the U-shaped tube, and the electronic liquid level meter is connected to the gas volume data acquisition instrument.

4. The coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device according to claim 3 is characterized by: One end of the U-shaped tube is connected to the gas outlet conduit of the gas collecting bottle through an air inlet pipe, and an air inlet valve is arranged on the air inlet pipe; and an air outlet valve is arranged on the air outlet pipe.

5. The coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device according to claim 3 is characterized by: The electronic liquid level meter and the air outlet pipe are arranged at the same end of the U-shaped tube.

6. The coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device according to claim 1 is characterized by: The gas collecting bottle and the gas outlet conduit are both transparent; the gas collecting bottle is connected with a transparent gas inlet conduit, and the gas inlet conduit is connected with the gas collecting pipe through a sealing rubber hose.

7. The coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device according to claim 1 is characterized by: The air collecting pipe is in sealing communication with the pulverizer through a threaded buckle.

8. The coal seam crushing and desorption gas blocking prevention and desorption amount automatic metering device according to claim 1 is characterized by: The pulverizer includes a pulverizer chamber and a cover plate sealingly covering an opening of the pulverizer chamber.

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