A coal dehydration system

Abstract

The utility model provides a kind of underground raw coal dehydration system, including conveyer belt and the roller screen, slime dehydration screen, sedimentation tank, filter press that are sequentially arranged;Moisture raw coal enters roller screen, and dry base lump coal on screen enters conveyer belt, and fine particle slime water under screen enters slime dehydration screen, and dry base slime on screen enters conveyer belt, and slime water under screen enters sedimentation tank, and is pumped into filter press, and slime after filter pressing enters conveyer belt, and clean water after filter pressing is discharged.The underground raw coal dehydration system simple structure, reasonable in design, can fully solve many problems of raw coal dehydration.

Description

Technical Field

[0001] This utility model relates to the field of coal mining, specifically to an underground raw coal dewatering system. Background Technology

[0002] During underground coal mining, a large amount of water is generated at the working face due to factors such as mine water inflow, water used for cutting coal seams, and water used for dust suppression spraying. This water enters the coal flow system via the scraper conveyor, resulting in a significant amount of water mixing into the raw coal. The high water content in the raw coal causes numerous problems, such as conveyor belt slippage and coal spillage, hindering transportation and impacting production; reduced coal quality, leading to decreased economic returns; and the excessive moisture content can also disrupt normal production processes in coal washing plants, potentially causing conveyor belt burial at steep inclines and coal bunker collapses, seriously threatening personnel safety.

[0003] To avoid these problems, the following solutions are currently commonly used:

[0004] 1) Placing multiple drainage pumps between the coal mining machine and the hydraulic supports to remove large amounts of water is currently the most common and effective method. However, the drainage pumps cannot remove all the water, and some water will still enter the coal flow, causing the same problems as before. Furthermore, the working environment at the coal face is harsh, making the drainage pumps prone to damage and requiring frequent replacement and maintenance, resulting in high labor costs. Simultaneously, transporting slurry underground is also difficult. Overall, this method is a stopgap measure, not a fundamental solution, and is also very costly.

[0005] 2) Modify a portion of the V-groove conveyor belt with flat idlers. The belt is protected on both sides with guard plates, leaving gaps between the guard plates and the belt. When raw coal is transported on the belt, the water in the raw coal will flow out through the gaps because the belt is flat. The flowing coal slurry water enters a sedimentation tank, where a coal slurry scraper is placed. Large coal particles in the sedimentation tank are slowly scraped onto the conveyor belt and transported away. The remaining coal slurry water is pumped to a water sump. However, this solution is mainly for coal mines with high water content in the raw coal, and the effect is not ideal. It can only alleviate transportation problems, but it is difficult to solve other problems. Moreover, after a large amount of coal slurry water enters the water sump, frequent cleaning is required.

[0006] 3) A dewatering device in the middle of a belt conveyor disclosed in Chinese patent CN219488796U can reduce the moisture content of the raw coal conveyed by the belt conveyor. However, this solution does not treat the coal slurry water. The discharge of coal slurry water into the water tank will cause frequent cleaning, increase the cleaning cost, and also cause serious wear and tear on the underground water tank drainage system, increasing maintenance costs.

[0007] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing an underground coal dewatering system.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] An underground raw coal dewatering system includes a conveyor belt and a roller screen, a coal slime dewatering screen, a sedimentation tank, and a filter press arranged in sequence. The raw coal containing water enters the roller screen for screening. The dry lump coal on the screen enters the conveyor belt, and the fine coal slime water on the screen enters the coal slime dewatering screen for screening. The dry coal slime on the screen enters the conveyor belt, and the coal slime water on the screen enters the sedimentation tank. After sedimentation, it is pumped into the filter press. After filtration, the coal slime enters the conveyor belt, and the clean water is discharged after filtration.

[0011] The conveyor belt's conveying surface wraps around the unloading drum and the redirecting drum to form a Z-shaped conveying surface; the roller screen is set close to the unloading drum, and the coal slime dewatering screen is located below the roller screen. The water-containing raw coal is thrown onto the roller screen after passing through the unloading drum.

[0012] A damping device is installed above the roller screen, and the damping device and the unloading roller of the conveyor belt are on the same straight line.

[0013] A roller screen underpass chute is provided on the lower side of the roller screen, through which fine coal slurry flows into the coal slurry dewatering system. A roller screen front chute is provided on the side of the roller screen away from the unloading drum, through which dry coal lumps on the screen flow into the conveyor belt. A coal slurry dewatering screen front chute is provided on the side of the coal slurry dewatering screen near the redirecting drum, and a coal slurry underpass chute is provided on the lower side of the coal slurry dewatering screen, through which dry coal slurry on the screen flows into the conveyor belt. Coal slurry water under the screen flows through the coal slurry dewatering screen underpass chute into the sedimentation tank.

[0014] The sedimentation tank is connected to the feed inlet of the filter press via a pipeline, and the coal slime dewatering screen underflow chute is also connected to the sedimentation tank via a pipeline.

[0015] The sedimentation tank is located below the conveyor belt, and the filter press is mounted above the conveyor belt.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides an underground raw coal dewatering system that combines a roller screen, a coal slime dewatering screen, a filter press and a conveyor belt to dewater raw coal containing water. It not only reduces the amount of roadway engineering, is easy to construct, and has a good treatment effect, but also completely solves the harm caused by water in raw coal. Furthermore, it can treat coal slime water into clean water, reducing the number of cleaning operations. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Conveyor belt; 2. Redirecting roller; 3. Unloading roller; 4. Roller screen; 5. Coal slime dewatering screen; 6. Sedimentation tank; 7. Filter press; 8. Damping device; 9. Roller screen underpass chute; 10. Coal slime dewatering screen underpass chute; 11. Coal slime dewatering screen front chute; 12. Roller screen front chute; 13. Slurry pump. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. "Installed," "equipped with," and "connected" can employ conventional means in the prior art, such as integral installation, snap-fit ​​installation, welding connection, adhesive connection, bolted connection, etc. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances and select suitable connection, setting, or installation methods from the existing technology.

[0022] like Figure 1-2 As shown, an underground raw coal dewatering system includes a conveyor belt 1 and a roller screen 4, a coal slime dewatering screen 5, a sedimentation tank 6, and a filter press 7 arranged sequentially. Moist raw coal enters the roller screen 4 for screening. The oversized dry lump coal enters the conveyor belt 1, and the undersized fine coal slime water enters the coal slime dewatering screen 5 for further screening. The oversized dry coal slime enters the conveyor belt 1, and the undersized coal slime water enters the sedimentation tank 6. After sedimentation, the liquid is pumped by a slurry pump 13 into the filter press 7 for filtration. The filtered coal slime then enters the conveyor belt 1, and the filtered water is discharged. Specifically, the conveyor belt, roller screen, coal slime dewatering screen, and filter press can all be existing commercially available equipment.

[0023] In one embodiment, the conveyor belt 1 forms a Z-shaped conveyor surface around the unloading roller 3 and the redirecting roller 2; the roller screen 4 is positioned close to the unloading roller 3, and the coal slime dewatering screen 5 is located below the roller screen 4. Moist coal is thrown onto the roller screen 4 after passing through the unloading roller 3. Specifically, the added unloading roller and redirecting roller can be fixed with a steel frame, with the unloading roller located diagonally above the redirecting roller. Preferably, the front section of the conveyor belt (the part conveying the moist coal) is inclined to raise the belt, facilitating the entry of the raw coal into the roller screen for dewatering.

[0024] In one embodiment, a damping device 8 is installed above the roller screen 4, and the damping device 8 and the unloading drum 3 of the conveyor belt 1 are aligned in the same straight line. Moist coal is conveyed by the conveyor belt to the unloading drum and then thrown onto the damping device. The purpose of the damping device is to block the thrown moist coal, reduce the coal flow velocity, and allow the coal flow to fall more evenly onto the rear half of the roller screen. Since the roller screen conveys from back to front, the moist coal will remain on the roller screen for a longer period.

[0025] In one embodiment, a roller screen 4 is provided with a roller screen underflow chute 9 on its lower side. Fine coal slurry water under the screen flows into the coal slurry dewatering along the roller screen underflow chute 9. A roller screen front chute 12 is provided on the side of the roller screen 4 away from the unloading drum 3. Dry coal lumps on the screen flow into the conveyor belt 1 along the roller screen front chute 12. A coal slurry dewatering screen 5 is provided with a coal slurry dewatering screen front chute 11 on its side near the redirecting drum 2. A coal slurry dewatering screen underflow chute 10 is provided on the lower side of the coal slurry dewatering screen 5. Dry coal slurry on the screen flows into the conveyor belt 1 along the coal slurry dewatering screen front chute 11. Coal slurry water under the screen flows through the coal slurry dewatering screen underflow chute 10 to the sedimentation tank 6.

[0026] Referring to the attached diagram, the roller screen is set at an angle, and the rollers rotate counterclockwise. Water and coal will move from back to front along the roller screen. As they move, due to the gaps between the rollers of the roller screen, water mixed with fine coal powder flows down from the gaps and falls onto the lower chute of the roller screen, and then onto the coal slime dewatering screen for processing. Meanwhile, the large dry coal particles after dewatering on the roller screen fall into the front chute of the roller screen and then enter the conveyor belt for transportation.

[0027] After the fine coal slurry from the roller screen falls onto the coal slurry dewatering screen, the coarse coal slurry larger than the screen openings remains on the screen plate. Through the high-frequency vibration of the dewatering screen, the coarse particles slowly move from the back to the front of the dewatering screen until they fall into the front chute of the coal slurry dewatering screen and are then conveyed by the conveyor belt. Meanwhile, the coal slurry smaller than the screen openings passes through the screen openings and falls into the lower chute of the coal slurry dewatering screen, and finally flows to the sedimentation tank through the connected pipes.

[0028] In one embodiment, the sedimentation tank 6 is connected to the feed inlet of the filter press 7 via a pipeline, and the coal slime dewatering screen chute 10 is also connected to the sedimentation tank 6 via a pipeline. After the coal slime water enters the sedimentation tank, it is pumped into the filter press for processing by a slurry pump. The filter press dries the coal slime water to form coal cakes, which fall onto a conveyor belt and are transported away. The filtered water is directly discharged into a ditch or flows to a designated location.

[0029] In one embodiment, the sedimentation tank 6 is located below the conveyor belt 1 to facilitate the flow of coal slurry into the sedimentation tank, and the filter press 7 is mounted above the conveyor belt 1 to facilitate the entry of dry material from the solid material outlet of the filter press onto the conveyor belt and to be transported to the next process by the conveyor belt.

[0030] The above embodiments can be combined with each other.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An underground raw coal dewatering system, characterized in that: It includes a conveyor belt and a roller screen, a coal slime dewatering screen, a sedimentation tank, and a filter press arranged in sequence; the conveyor surface of the conveyor belt is arranged in a Z-shaped manner around the unloading drum and the redirecting drum; the roller screen is set close to the unloading drum, the coal slime dewatering screen is located below the roller screen, and the water-containing raw coal is sprinkled onto the roller screen after passing through the unloading drum.

2. The underground raw coal dewatering system according to claim 1, characterized in that: A damping device is installed above the roller screen, and the damping device and the unloading roller of the conveyor belt are on the same straight line.

3. The underground raw coal dewatering system according to claim 2, characterized in that: A roller screen underpass chute is provided on the lower side of the roller screen, through which fine coal slurry flows into the coal slurry dewatering system. A roller screen front chute is provided on the side of the roller screen away from the unloading drum, through which dry coal lumps on the screen flow into the conveyor belt. A coal slurry dewatering screen front chute is provided on the side of the coal slurry dewatering screen near the redirecting drum, and a coal slurry underpass chute is provided on the lower side of the coal slurry dewatering screen, through which dry coal slurry on the screen flows into the conveyor belt. Coal slurry water under the screen flows through the coal slurry dewatering screen underpass chute into the sedimentation tank.

4. The underground raw coal dewatering system according to claim 3, characterized in that: The sedimentation tank is connected to the feed inlet of the filter press via a pipeline, and the coal slime dewatering screen underflow chute is also connected to the sedimentation tank via a pipeline.

5. The underground raw coal dewatering system according to claim 4, characterized in that: The sedimentation tank is located below the conveyor belt, and the filter press is mounted above the conveyor belt.

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