A working face arrangement method with simple gas control and high-quality coal

Abstract

The present invention discloses a working face arrangement method with simple gas control and high-quality coal, comprising the following steps: (1) determining the coal seam; (2) system analysis before arrangement; (3) working face arrangement. The present invention extends the borehole to the coal seam to be arranged for the working face while constructing a gas pre-extraction borehole on the coal mining working face being mined, comprehensively analyzes the coal and rock in the coal seam to be arranged for the working face, increases the mineable coal seam, and analyzes and determines whether the coal seam to be arranged for the working face is mineable without constructing exploration boreholes on the ground or re-constructing coal exploration holes underground, thus saving gas control time and reducing the input of materials and personnel for gas control, successfully arranging a working face with high-quality coal, extending the mining life of the mining area, increasing the coal mining volume by 485,690 tons, and achieving a clean coal recovery rate of 60%, creating direct economic benefits of up to 100 million yuan for a certain mine.

Description

Technical Field

[0001] The invention relates to a working face arrangement method with simple gas control and high-quality coal, belonging to the technical field of coal mining methods. Background Art

[0002] A certain mine is an old mine that has been mined for nearly 50 years. To ensure the sustainable development of the mine, coal reserves and the number of mineable coal layers are the key. In order to solve the mining and excavation continuity and coal quality problems in the mine, it is necessary to find a coal seam with simple gas control and high-quality coal to arrange the working face, that is, it is necessary to explore new mineable coal seams.

[0003] The existing sampling method for coal seams is mainly the core sampling method, which refers to the use of a drilling machine to sample coal seams that have not yet appeared in the production mine or are ready to be mined. This method is fast, accurate, low in labor intensity and more representative. During sampling, the core drilling tube is used to drill the entire coal seam or part of the coal seam to obtain a cylindrical coal sample. The diameter of the coal sample can vary within the range of 50-200 mm according to needs.

[0004] In the prior art, the coal sample is placed in a plastic bottle, the lid is tightened, and then the sample is manually carried to the laboratory for analysis. The problems with this method are:

[0005] 1. There is insufficient light in the mine, and the mouth of the plastic bottle is very small, which makes it inconvenient to put the coal sample in. The coal sample is easy to spill out, affecting the accuracy of the final analysis and detection;

[0006] 2. And because the coal sample is cylindrical, it needs to be operated by hand, and the process of loading the coal sample takes a long time. The coal sample reacts with the air, and the change in the content of the coal sample will also affect the accuracy of the final analysis and detection;

[0007] 3. Coal ash and other substances are easily blown up, resulting in the loss of part of the coal sample, and workers are prone to inhalation and pneumoconiosis;

[0008] 4. It is also inconvenient to remove the coal sample before analysis and testing, as the coal sample will partially adhere to the inside of the bottle, affecting the accuracy of the final analysis and testing. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a working face arrangement method with simple gas control and high-quality coal, so as to solve the problem of inconvenient storage of coal samples.

[0010] The technical solution adopted by the present invention is: a working face arrangement method with simple gas control and high-quality coal, comprising the following steps:

[0011] (1) Determine the coal seam: determine the coal seam for the working face layout;

[0012] (2) System analysis before layout: While drilling gas pre-extraction holes in the coal mining face being mined, extend the boreholes to the coal seam where the working face is to be laid out, sample the coal seam where the working face is to be laid out, and test its ash and sulfur content, determine the clean coal recovery rate, and judge the thickness of the coal seam;

[0013] (3) Working face layout: Arrange the mining working face according to the analysis results in step (2).

[0014] Preferably, the storage and transportation of coal samples in step (2) adopts the following device: comprising a sampling box, the mouth of which is detachably connected to a cover, the interior of which is slidingly and sealingly connected to a scraper, a push rod is fixed to the lower end of the scraper, and the push rod vertically penetrates the bottom of the sampling box and extends to the bottom of the sampling box.

[0015] Preferably, a first handle is fixed to the bottom of the push rod.

[0016] Preferably, a second handle is fixed to the top of the cover.

[0017] Preferably, the push rod is slidingly and sealingly connected to the sampling box; a one-way water inlet valve and a one-way drain valve are provided at the bottom of the sampling box, the one-way water inlet valve is connected to a water source through a pipeline, and the one-way drain valve is connected to a drain pipe, and the outlet end of the drain pipe is located at the mouth of the sampling box.

[0018] Preferably, the mouth of the drain pipe is provided with fan-shaped nozzles arranged in a horizontal direction.

[0019] Preferably, the water source includes a water tank fixed below the sampling box, the one-way water inlet valve is connected to the interior of the water tank through a water inlet pipe, the part of the water inlet pipe located inside the water tank is a hose, and a gravity bead is connected to the end of the hose.

[0020] Preferably, the lower end of the scraper is connected to the sampling box via a spring.

[0021] Preferably, the scraper is made of a light-transmitting material, a photoresistor sensor is provided at the bottom of the sampling box, a light bulb is provided at the mouth of the sampling box, a transparent protective cover is provided at the periphery of the light bulb, the sampling box and the cover are both made of light-shielding materials, a transparent window is provided on the side wall of the sampling box, a slide groove is provided on the portion of the sampling box located outside the transparent window, a slide plate is slidably connected in the slide groove, and the slide plate is made of a light-shielding material; during the sliding of the slide plate, the transparent window can be changed from completely light-transmitting to completely light-impermeable; a first electromagnet and a second electromagnet are respectively provided on one end connecting the sampling box and the cover, the photoresistor sensor is electrically connected to the first electromagnet and the second electromagnet through a controller, and when the photoresistor sensor senses light, the photoresistor sensor controls the first electromagnet and the second electromagnet to be powered on and attract each other through the controller; when the photoresistor sensor does not sense light, the photoresistor sensor controls the first electromagnet and the second electromagnet to be powered on and attract each other through the controller.

[0022] Preferably, the inner side wall of the sampling box and the upper end surface of the scraper are smooth.

[0023] Beneficial effects of the present invention:

[0024] 1. Compared with the prior art, the present invention extends the borehole to the coal seam where the working face is to be arranged while constructing a gas pre-extraction borehole in the coal mining working face being mined, conducts a comprehensive analysis of the coal and rock in the coal seam where the working face is to be arranged, increases the mineable coal seams, and does not require exploration drilling on the ground, nor does it require re-construction of coal exploration holes underground to analyze and determine whether the coal seam where the working face is to be arranged is mineable, thereby saving time for gas control and reducing the investment in materials and personnel for gas control. A working face with high-quality coal is successfully arranged, extending the mining life of the mining area, increasing coal production by 485,690 tons, and achieving a clean coal recovery rate of 60%, creating direct economic benefits of up to 100 million yuan for a certain mine.

[0025] 2. Compared with the prior art, the present invention is very convenient for loading and removing coal samples, and the coal sample loading process takes a short time. The coal sample hardly reacts with the air, and the component content of the coal sample hardly changes. Through spraying, the coal ash is not easy to be lifted up, thereby avoiding the loss of part of the coal sample and preventing workers from inhaling and getting pneumoconiosis. Through the setting of the scraper and the flushing of the spray, the coal sample will not adhere to the sampling box and the scraper, thereby improving the accuracy of the final analysis and detection.

[0026] 3. In particular, compared with the prior art, in the present invention, when no coal sample is loaded in the sampling box, the photoresistor sensor can be irradiated by the LED light, and therefore, the lid can be opened; thus, the coal sample can be loaded into the sampling box; after the coal sample is loaded into the sampling box, the coal sample covers the scraper, the photoresistor sensor cannot be irradiated by the LED light, and the lid cannot be opened; after the sampling box is brought to the laboratory, the slide plate is pushed upward to expose the transparent glass window, so that the transparent glass window is illuminated by natural light, and similarly, the lid can be opened again and the coal sample can be taken out; thus, once the coal sample is loaded into the sampling box, no unrelated personnel are allowed to open the sampling box again, thereby avoiding mixing or spilling of the coal sample, and the sampling box must be brought to the laboratory before it can be opened, thereby avoiding detection errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the coal sample storage and transportation device. DETAILED DESCRIPTION

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

[0029] Embodiment 1:

[0030] A working face arrangement method with simple gas control and high-quality coal includes the following steps:

[0031] (1) Determine the coal seam: Determine the coal seam No. 19 to be used for the working face layout;

[0032] (2) System analysis before layout: While constructing a downward gas pre-extraction borehole at the mining face of the No. 18 coal seam being mined (the No. 18 coal seam is located above the No. 19 coal seam), the borehole is extended to the No. 19 coal seam, and the No. 19 coal seam is sampled and tested for ash and sulfur content to determine the clean coal recovery rate and the thickness of the No. 19 coal seam. In this embodiment, the interlayer spacing between the No. 19 coal seam and the No. 18 coal seam is only 3 to 5 meters, with an average interlayer spacing of 4 meters, a coal thickness of 1.3 to 1.9 meters, and an average coal thickness of 1.6 meters. After sampling and analysis, the No. 19 coal seam is medium-ash and low-sulfur coal, with an ash content (Ag%) of 19-23%, a sulfur content (Sg%) of 0.2-0.3%, and a clean coal recovery rate of about 60%.

[0033] Working face layout: Based on the analysis results in step (2), the existing working face layout method is used to arrange the 221908 mining working face.

[0034] The storage and transportation of the coal sample in step (2) is carried out by the following device: Figure 1As shown, the sampling box 10 includes a rectangular parallelepiped, the top of the sampling box 10 is open, the mouth of the sampling box 10 is clamped with a cover 30 with a rectangular shape and an open lower end, a second handle 31 is fixed to the top center of the cover 30, and the interior of the sampling box 10 is slidably sealed and connected with a rectangular scraper 13, the scraper 13 is coaxially arranged with the sampling box 10, the inner side wall of the sampling box 10 and the upper end surface of the scraper 13 are smooth, and the scraper 13 A push rod 131 is coaxially fixed to the center of the lower end of the sampling box 10, and the lower end of the push rod 131 vertically penetrates the bottom of the sampling box 10 and extends to the bottom of the sampling box 10, and the push rod 131 is slidably sealed and connected to the sampling box 10; a first handle 132 is fixed to the bottom of the push rod 131; a one-way water inlet valve 12 and a one-way drain valve 11 are provided at the bottom of the sampling box 10, and the one-way water inlet valve 12 is connected to the water storage tank 20 through a pipeline, and the water storage tank 20 is fixed to the sampling box Below 10, the one-way water inlet valve 12 is connected to the inside of the water tank 20 through the water inlet pipe. The part of the water inlet pipe located inside the water tank 20 is a hose 21, and the end of the hose 21 is connected with a gravity bead 22. The structure of the hose 21 and the gravity bead 22 is similar to the structure of the rubber hose 21 and the gravity bead 22 in the baby's bottle. The purpose of setting the hose 21 and the gravity bead 22 is that when the present invention is inverted, the sampling box 10 can still absorb water in the water tank; the top of the water tank 20 is provided with a through hole, and a plug 23 is connected in the through hole. The plug 23 is provided to facilitate the replenishment of water into the water tank 20; the one-way drain valve 11 is connected to a drain pipe 111, and the drain pipe 111 is embedded in the left side wall of the sampling box 10. The outlet end of the drain pipe 111 is located at the mouth of the sampling box 10, and the mouth of the drain pipe 111 is provided with a fan-shaped nozzle 112 arranged in the horizontal direction, and the outlet end of the fan-shaped nozzle 112 is arranged horizontally to the right.

[0035] When the scraper 13 slides upward relative to the sampling box 10, negative pressure is generated in the part of the sampling box 10 below the scraper 13, the one-way water inlet valve 12 opens, the one-way water outlet valve 11 closes, and the part of the sampling box 10 below the scraper 13 sucks water from the water tank; when the scraper 13 slides downward relative to the sampling box 10, positive pressure is generated in the part of the sampling box 10 below the scraper 13, the one-way water inlet valve 12 closes, the one-way water outlet valve opens, and the water in the part of the sampling box 10 below the scraper 13 is discharged through the drain pipe 111 and the nozzle; thus, the sampling box 10 is equivalent to a water pump.

[0036] like Figure 1 As shown, in order to prevent the scraper 13 from sliding out of the sampling box 10, a stopper 19 is provided at the mouth of the front and rear side walls of the sampling box 10 respectively.

[0037] Before loading the coal sample, open the cover 30, push the push rod 131 by hand to drive the scraper 13 to move upward to the upper limit position, and the part of the sampling box 10 below the scraper 13 will absorb water. When loading the coal sample, release the hand holding the push rod 131, and the scraper 13 will move downward under its own gravity, squeezing the water inside the sampling box 10 into the drain pipe 111 and spraying it out through the nozzle. At the same time, the coal sample enters the sampling box 10 and falls on the scraper 13. The water mist sprayed by the fan-shaped nozzle 112 can play a role in dust reduction and prevent coal ash from being raised.

[0038] After the coal sample is loaded, the cover 30 is closed to prevent the moisture inside the sampling box 10 from volatilizing.

[0039] Since the ash content is measured by muffle furnace burning and the sulfur content is measured by weight method or high temperature combustion method, both of which require high temperature burning or combustion, the addition of water will not have any effect on the detection of ash and sulfur content.

[0040] In order to prevent the coal sample from absorbing water and adhering to the scraper 13 during the carrying process of the sampling box 10, which is not conducive to the later removal of the coal sample, Figure 1 As shown, the lower end of the scraper 13 is connected to the sampling box 10 through the spring 14. When the sampling box 10 is carried, the scraper 13 shakes up and down. After the scraper 13 throws the coal sample upward, the coal sample falls on the scraper 13 under its own gravity, and the scraper 13 stirs the coal sample. At the same time, the spring 14 has another function: when the coal sample is loaded, the scraper 13 is located at the upper limit position, and the spring 14 is stretched. After the hand holding the push rod 131 is released, the scraper 13 moves downward rapidly under its own gravity and the force of the spring 14, and the mouth of the sampling box 10 can generate negative pressure to suck in the coal sample, especially the coal ash in the coal sample, to avoid leakage of the coal sample.

[0041] Once the coal sample is loaded into the sampling box 10, no unauthorized personnel are allowed to open the sampling box 10, thereby preventing the coal sample from being mixed or spilled. The sampling box 10 must be brought to the laboratory before it can be opened.

[0042] In order to achieve the above purpose, therefore, in this embodiment, the scraper 13 is made of a light-transmitting material, specifically a transparent plastic plate, such as Figure 1As shown, a photoresistor sensor 15 is arranged at the bottom of the sampling box 10, an LED lamp 171 is arranged at the mouth of the sampling box 10, and a transparent plastic protective cover 17 is arranged on the periphery of the LED lamp 171. The sampling box 10 and the cover 30 are both made of light-shielding materials, specifically stainless steel. A rectangular hole arranged in the vertical direction is provided on the right side wall of the sampling box 10, and a transparent window arranged in the vertical direction is provided on the left side of the rectangular hole. The transparent window seals the rectangular hole. The material of the transparent window is tempered glass. A slide groove 16 is provided on the side wall of the right part of the rectangular hole, i.e., the part located outside the transparent window. The slide groove 16 extends upward to a height that is twice the height of the rectangular hole. A slide plate 161 that can cover the rectangular hole is slidably connected in the slide groove 16, and the slide plate 161 is made of stainless steel. The slide plate 161 is made of steel material; in the process of sliding downward, the slide plate 161 and the transparent window can be completely aligned from completely misaligned, that is, the transparent window changes from being completely light-transmissive to being completely opaque; the first electromagnet and the second electromagnet are respectively arranged on one end connecting the sampling box 10 and the cover 30, and the photoresistor sensor 15 is electrically connected to the first electromagnet and the second electromagnet through a controller. When the photoresistor sensor 15 senses light, the photoresistor sensor 15 controls the first electromagnet and the second electromagnet to be powered off through the controller, and the cover 30 can be opened; when the photoresistor sensor 15 does not sense light, the photoresistor sensor 15 controls the first electromagnet and the second electromagnet to be powered on and attract each other through the controller, and the cover 30 cannot be opened.

[0043] In this embodiment, the LED lamp 171 is always on, and the slide plate 161 is located at the bottom of the slide 16 under its own gravity. Before the coal sample is loaded into the sampling box 10, the scraper 13 is light-transmissive, so the photoresistor sensor 15 can be irradiated by the LED lamp 171. Therefore, the photoresistor sensor 15 controls the first electromagnet and the second electromagnet to be powered off through the controller, and the cover 30 can be opened; thereby, the coal sample can be loaded into the sampling box 10; after the coal sample is loaded into the sampling box 10, the coal sample covers the scraper 13, and because water is added to the coal sample, the coal sample can cover the scraper 13 more evenly, and the photoresistor sensor 15 cannot be irradiated by the LED lamp 171. The photoresistor sensor 15 controls the first electromagnet and the second electromagnet to be powered on and attract each other through the controller, and the cover 30 cannot be opened. After the sampling box 10 is brought to the laboratory, the slide plate 161 is pushed upward to expose the transparent glass window so that the transparent glass window is illuminated by natural light. Similarly, the cover 30 can be opened again and the coal sample can be taken out.

[0044] After the cover 30 is opened, the present invention is turned upside down, and the scraper 13 moves downward under its own gravity. The scraper 13 discharges the coal sample into the designated container, and at the same time, water is sucked into the sampling box 10. After the coal sample is discharged, the push rod 131 is lifted upward. Similarly, the sampling box 10 discharges water mist to rinse the scraper 13 and the protective cover 17, ensuring that the LED lamp 171 and the photoresistor sensor 15 can continue to cooperate.

[0045] Since water is added to the coal sample, the amount of added water needs to be deducted in the subsequent analysis and detection of the coal sample, that is, twice the amount of water in the sampling box 10. The amount of water in the sampling box 10 can be calculated based on the amount of water discharged after the sampling box 10 is filled with water.

[0046] In order to facilitate the placement of the present invention, Figure 1 As shown, four right supporting legs 18 are provided at the bottom of the sampling box 10 , and the water storage tank 20 is fixed on the supporting legs 18 .

[0047] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A working face arrangement method with simple gas control and high-quality coal, characterized by: The following steps are involved: (1) Determine the coal seam: determine the coal seam to be used for working face layout; (2) System analysis before layout: While drilling gas pre-extraction holes in the coal mining face being mined, extend the boreholes to the coal seam where the working face is to be laid out, sample the coal seam where the working face is to be laid out, and test its ash and sulfur content, determine the clean coal recovery rate, and judge the thickness of the coal seam; (3) Working face layout: arranging the mining working face according to the analysis results in step (2); The storage and transportation of the coal sample in step (2) adopts the following device: comprising a sampling box (10), the mouth of the sampling box (10) is detachably connected to a cover (30), the interior of the sampling box (10) is slidably and sealably connected to a scraper (13), a push rod (131) is fixed to the lower end of the scraper (13), and the push rod (131) vertically penetrates the bottom of the sampling box (10) and extends to the bottom of the sampling box (10); The scraper (13) is made of a light-transmitting material. A photoresistor sensor (15) is arranged at the bottom of the sampling box (10). An LED lamp (171) is arranged at the mouth of the sampling box (10). A transparent protective cover (17) is arranged on the periphery of the LED lamp (171). The sampling box (10) and the cover (30) are both made of a light-shielding material. A transparent window is arranged on the side wall of the sampling box (10). A slide groove (16) is provided on the portion of the sampling box (10) located outside the transparent window. A slide plate (161) is slidably connected in the slide groove (16). The slide plate (161) is made of a light-shielding material. The slide plate (161) slides through the During the process, the transparent window can be changed from completely light-transmissive to completely light-impermeable; a first electromagnet and a second electromagnet are respectively arranged on one end where the sampling box (10) and the cover (30) are connected; the photoresistor sensor (15) is electrically connected to the first electromagnet and the second electromagnet through a controller; when the photoresistor sensor (15) senses light, the photoresistor sensor (15) controls the first electromagnet and the second electromagnet to be powered off through the controller; when the photoresistor sensor (15) does not sense light, the photoresistor sensor (15) controls the first electromagnet and the second electromagnet to be powered on through the controller and to attract each other.

2. A working face arrangement method with simple gas control and high-quality coal according to claim 1, characterized in that: A first handle (132) is fixed to the bottom of the push rod (131).

3. A working face arrangement method with simple gas control and high-quality coal according to claim 1, characterized in that: A second handle (31) is fixed to the top of the cover (30).

4. A working face arrangement method with simple gas control and high-quality coal according to claim 1, characterized in that: The push rod (131) is slidably and hermetically connected to the sampling box (10); a one-way water inlet valve (12) and a one-way drain valve (11) are provided at the bottom of the sampling box (10); the one-way water inlet valve (12) is connected to a water source via a pipeline; the one-way drain valve (11) is connected to a drain pipe (111); the outlet end of the drain pipe (111) is located at the mouth of the sampling box (10).

5. A working face arrangement method with simple gas control and high-quality coal according to claim 4, characterized in that: The mouth of the drainage pipe (111) is provided with a fan-shaped spray nozzle (112) arranged in a horizontal direction.

6. A working face arrangement method with simple gas control and high-quality coal according to claim 4, characterized in that: The water source comprises a water storage tank (20) fixed below the sampling box (10); the one-way water inlet valve (12) is connected to the interior of the water storage tank (20) via a water inlet pipe; the portion of the water inlet pipe located inside the water storage tank (20) is a hose (21); a gravity bead (22) is connected to the end of the hose (21).

7. A working face arrangement method with simple gas control and high-quality coal according to claim 1, characterized in that: The lower end of the scraper (13) is connected to the sampling box (10) via a spring (14).

8. A working face arrangement method with simple gas control and high-quality coal according to claim 1, characterized in that: The inner side wall of the sampling box (10) and the upper end surface of the scraper (13) are both smooth.

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