Low-rank coal modification system and method

Abstract

The invention relates to the technical field of coal modification, in particular to a low-rank coal modification system and method. The method comprises the following steps: 1, sorting collected coal, and removing stones and parts with poor quality; step 2, repeatedly cleaning fine sand stones with similar particle sizes, and removing dust and impurities to obtain fine washed sand; 3, the washed sand is filled into a modification system, and the coal briquettes are buried in the washed sand; 4, stirring the washed sand and the coal briquettes, and filling sufficient clean water for cleaning; 5, screening after centrifugal filtration to obtain coal briquettes and washed sand; sixthly, the coal briquettes are laid in warm air equipment for blowing and drying, and gravels attached to the coal briquettes are taken away through warm air; and the modification system comprises an outer barrel internally and rotatably connected with an inner barrel, a plurality of partition plates are arranged on the outer wall of the inner barrel and the inner wall of the outer barrel, and the crushing rate of the coal can be reduced when the coal is cleaned.

Description

Technical Field

[0001] This invention relates to the field of coal modification technology, and more specifically to a low-rank coal modification system and method. Background Technology

[0002] Low-rank coal is a type of coal characterized by a long, smoky flame when burned, and a relatively low degree of coalification. It appears grayish-black to black, with powder ranging from brown to black. Upgrading low-rank coal requires washing to reduce its ash, sulfur, and volatile matter content. However, current coal washing methods typically involve simply rinsing and turning the coal, which leads to collisions and breakage during the turning process, resulting in a decrease in coal quality. Therefore, this application proposes a low-rank coal modification system and method to reduce the coal breakage rate during washing. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a low-rank coal modification system and method that can reduce the coal breakage rate during coal washing.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A method for modifying low-rank coal, the method comprising the following steps:

[0006] Step 1: Sorting the collected coal, removing stones and parts of poor quality;

[0007] Step 2: Repeatedly wash fine sand and gravel of similar particle size to remove dust and impurities and obtain fine washed sand.

[0008] Step 3: Fill the modified system with washed sand and bury the coal blocks in the washed sand;

[0009] Step 4: Stir the sand and coal lumps and add enough clean water for washing;

[0010] Step 5: After centrifugal filtration, the mixture is sieved to obtain coal blocks and washed sand;

[0011] Step Six: Lay the coal blocks in the warm air equipment for air drying, using the warm air to remove the sand and gravel adhering to the coal blocks.

[0012] The modified system includes an outer barrel with an inner barrel rotatably connected to it. Multiple baffles are provided on the outer wall of the inner barrel and the inner wall of the outer barrel. Multiple filter holes are provided on both the outer barrel and the inner barrel. A threaded hole is provided at the outer end of the inner barrel, and a cover is connected to the threaded hole. A water nozzle is rotatably connected to the lower end of the inner barrel.

[0013] Both the outer and inner tubs are rotatably connected to the outer frame, and a gear A is rotatably connected to the outer frame. Gear rings B and A are fixed at the lower ends of the outer and inner tubs, respectively, and gear rings B and A mesh with gear A for transmission.

[0014] The outer end of the outer frame is provided with a water tank around multiple filter holes covering the outer barrel, and a conduit is provided at the lower end of the water tank.

[0015] The outer frame is rotatably connected to the rotating frame, which in turn is rotatably connected to the mounting frame. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 This is a flowchart of the low-rank coal modification method in this invention;

[0018] Figure 2 and Figure 3 This is a schematic diagram of the modified system in this invention;

[0019] Figure 4 This is a schematic diagram of the toothed ring B in this invention;

[0020] Figure 5 This is a schematic diagram of the covering structure in this invention;

[0021] Figure 6 This is a schematic diagram of the outer barrel structure in this invention;

[0022] Figure 7 This is a schematic diagram of the inner barrel structure in this invention;

[0023] Figure 8 This is a schematic diagram of the outer frame structure in this invention;

[0024] Figure 9 This is a schematic diagram of the toothed ring C in this invention;

[0025] Figure 10 This is a schematic diagram of the structure of the transfer frame in this invention;

[0026] In the diagram: Outer tub 01; Inner tub 02; Partition 03; Filter hole 04; Threaded hole 05; Water tap 06; Gear ring A 07; Gear ring B 08; Outer frame 09; Water tank 10; Pipe 11; Gear A 12; Cover 13; Gear ring C 14; Turning frame 15; Gear B 16; Mounting bracket 17. Detailed Implementation

[0027] Through observation Figure 1 The process of modifying low-rank coal can be derived from the diagram.

[0028] A method for modifying low-rank coal, the method comprising the following steps:

[0029] Step 1: Sorting the collected coal, removing stones and parts of poor quality;

[0030] Step 2: Repeatedly wash fine sand and gravel of similar particle size to remove dust and impurities and obtain fine washed sand.

[0031] Step 3: Fill the modified system with washed sand and bury the coal blocks in the washed sand;

[0032] Step 4: Stir the sand and coal lumps and add enough clean water for washing;

[0033] Step 5: After centrifugal filtration, the mixture is sieved to obtain coal blocks and washed sand;

[0034] Step Six: Lay the coal blocks in the warm air equipment for air drying, using the warm air to remove the sand and gravel adhering to the coal blocks;

[0035] Washing coal with clean water reduces the ash, sulfur, and volatile matter content, improving its calorific value and combustion efficiency. During the washing process, the washed sand can agitate the coal, reducing collisions between the coal and other coal types, thus preventing coal breakage due to collisions and reducing the amount of coal slag generated during washing.

[0036] Through observation Figures 2 to 10 An exemplary working process for cleaning coal, as shown in the diagram, is as follows:

[0037] The modified system includes an outer barrel 01 internally rotatably connected to an inner barrel 02. Multiple partitions 03 are provided on the outer wall of the inner barrel 02 and the inner wall of the outer barrel 01. Multiple filter holes 04 are provided on both the outer barrel 01 and the inner barrel 02. A threaded hole 05 is provided at the outer end of the inner barrel 02, and a cover 13 is connected to the threaded hole 05. A water nozzle 06 is rotatably connected to the lower end of the inner barrel 02. The system is configured such that the open end of the outer barrel 01 faces upwards. Then, some washed sand is laid in the space between the inner barrel 02 and the outer barrel 01. Coal is then added to the washed sand in the space between the inner barrel 02 and the outer barrel 01. Washed sand is then continued to be laid in the space between the inner barrel 02 and the outer barrel 01 until it is full. The coal is buried by the washed sand. Then, by rotating the cover 13, the connection in the middle of the cover 13 is made into the threaded hole 05, so that the cover 13 can block the opening end of the outer barrel 01 of the inner barrel 02. Then, the water pipe is connected to the water nozzle 06, and the water is introduced into the inner barrel 02. The water enters the washed sand and coal through multiple filter holes 04 on the inner barrel 02, and the coal is washed with water. The wastewater generated after washing will flow out through multiple filter holes 04 on the outer barrel 01. At the same time, the space between the inner barrel 02 and the outer barrel 01 can be evenly divided by multiple partitions 03, reducing the range of coal movement and reducing collisions between coal.

[0038] Through observation Figures 2 to 10 An exemplary working process for turning coal, as shown in the diagram, is as follows:

[0039] Both the outer barrel 01 and the inner barrel 02 are rotatably connected to the outer frame 09. A gear A12 is rotatably connected to the outer frame 09. Gear rings B08 and A07 are fixed at the lower ends of the outer barrel 01 and the inner barrel 02, respectively. Gear rings B08 and A07 mesh with gear A12 for transmission. The gear A12 is driven to rotate by a reduction motor, which in turn drives gear rings B08 and A07 to rotate in opposite directions. This results in the outer barrel 01 and the inner barrel 02 rotating in opposite directions. Multiple partitions 03 can be used to move the washed sand and coal, allowing the coal to be turned over in the washed sand. This ensures that the clean water can thoroughly wash the coal, while the washed sand around the coal buffers the turning process and prevents the coal from breaking.

[0040] Furthermore, the distance between the partitions 03 on the outer wall of the inner barrel 02 and the inner wall of the outer barrel 01 is 20 mm. This ensures that the partitions 03 moving in opposite directions will not collide and can move smoothly. At the same time, the 20 mm distance between the partitions 03 allows the washed sand on both sides of the same partition 03 to be exchanged, enabling the washed sand to turn over and move, ensuring that the washed sand does not clump together. This improves the flowability of the washed sand, enhances its buffering capacity for coal, and prevents coal from moving from one side of the partition 03 to the other. It keeps the coal on both sides of the partition 03 within the range of movement and prevents coal accumulation.

[0041] Through observation Figures 2 to 10 An exemplary working process for draining wastewater, as shown in the diagram, is as follows:

[0042] The outer frame 09 is provided with a water tank 10 around multiple filter holes 04 on the outer barrel 01 at its outer end. A conduit 11 is provided at the lower end of the water tank 10. When the generated sewage flows out, the sewage flowing out of the multiple filter holes 04 on the outer barrel 01 can enter the water tank 10 for collection, and then be guided out through the conduit 11 at the lower end of the water tank 10. This facilitates the collection and diversion of sewage and avoids sewage pollution of the working environment.

[0043] Through observation Figures 2 to 10 An exemplary working process for discharging washed sand and coal, as shown in the diagram, is as follows:

[0044] The outer frame 09 is rotatably connected to the rotating frame 15, which is rotatably connected to the mounting frame 17. The rotating frame 15 is driven by another motor to rotate on the mounting frame 17. The rotating frame 15 can drive the outer frame 09 to flip the inner barrel 02 and the outer barrel 01. When adding water-washed sand and coal, the openings of the inner barrel 02 and the outer barrel 01 are turned upwards. After washing, the openings of the inner barrel 02 and the outer barrel 01 are turned downwards to automatically pour out the water-washed sand and coal.

[0045] Through observation Figures 2 to 10 An exemplary working process for centrifugal dewatering, as shown in the figure, is as follows:

[0046] A gear ring C14 is fixedly connected to the lower end of the outer frame 09, and a gear B16 that meshes with the gear ring C14 is rotatably connected to the mounting bracket 17. After cleaning, the geared motor that drives the gear A12 can be braked, thus fixing the gear A12 from rotating. The gear A12 can then mesh to fix the gear rings B08 and A07, preventing them from rotating. Subsequently, the geared motor drives the gear B16 to rotate, causing the gear B16 to mesh and drive the gear ring C14 and the outer frame 09 to rotate. This causes the outer frame 09 to drive the inner barrel 02 and the outer barrel 01 to rotate. During rotation, the water in the washed sand and coal is caused to flow out due to centrifugal force, thus achieving a rapid dehydration process for the washed sand and coal.

[0047] Through observation Figures 2 to 10 An exemplary working process that is easy to observe can be obtained from the figure as follows:

[0048] The outer barrel 01, inner barrel 02, and cover 13 are all made of transparent material, which makes it easy to observe the condition of the washed sand and coal inside the outer barrel 01, inner barrel 02, and cover 13, and at the same time, the cleaning process and effect can be monitored by the change of wastewater color.

[0049] Through observation Figures 2 to 10 An exemplary working process to avoid the loss of washing sand, as shown in the figure, is as follows:

[0050] Each of the multiple filter holes 04 is equipped with a filter screen; it can block the washed sand in the space between the outer barrel 01 and the inner barrel 02, and prevent the washed sand from being lost through the multiple filter holes 04.

Claims

1. A method for modifying low-rank coal, characterized in that, The method includes the following steps: Step 1: Sorting the collected coal, removing stones and parts of poor quality; Step 2: Repeatedly wash fine sand and gravel of similar particle size to remove dust and impurities and obtain fine washed sand. Step 3: Fill the modified system with washed sand and bury the coal blocks in the washed sand; Step 4: Stir the sand and coal lumps and add enough clean water for washing; Step 5: After centrifugal filtration, the mixture is sieved to obtain coal blocks and washed sand; Step Six: Lay the coal blocks in the warm air equipment for air drying, using the warm air to remove the sand and gravel adhering to the coal blocks.

2. The method for modifying low-rank coal according to claim 1, characterized in that: The modified system includes an outer barrel (01) with an inner barrel (02) rotatably connected to it. Multiple partitions (03) are provided on the outer wall of the inner barrel (02) and the inner wall of the outer barrel (01). Multiple filter holes (04) are provided on both the outer barrel (01) and the inner barrel (02). A threaded hole (05) is provided at the outer end of the inner barrel (02). A cover (13) is connected in the threaded hole (05). A water nozzle (06) is rotatably connected to the lower end of the inner barrel (02).

3. The method for modifying low-rank coal according to claim 2, characterized in that: The outer barrel (01) and the inner barrel (02) are rotatably connected to the outer frame (09). A gear A (12) is rotatably connected to the outer frame (09). A toothed ring B (08) and a toothed ring A (07) are fixed at the lower ends of the outer barrel (01) and the inner barrel (02), respectively. Both the toothed ring B (08) and the toothed ring A (07) mesh with the gear A (12) for transmission.

4. The method for modifying low-rank coal according to claim 3, characterized in that: The outer end of the outer frame (09) is provided with a water tank (10) surrounding multiple filter holes (04) on the outer barrel (01), and the lower end of the water tank (10) is provided with a conduit (11).

5. The method for modifying low-rank coal according to claim 4, characterized in that: The outer frame (09) is rotatably connected to the rotating frame (15), and the rotating frame (15) is rotatably connected to the mounting frame (17).

6. The method for modifying low-rank coal according to claim 5, characterized in that: The lower end of the outer frame (09) is fixedly connected to a toothed ring C (14), and a gear B (16) that meshes with the toothed ring C (14) is rotatably connected to the mounting bracket (17).

7. The method for modifying low-rank coal according to claim 6, characterized in that: The gears A (12) and B (16) are driven by two geared motors, and the geared motor that drives the gear A (12) to rotate is equipped with a brake.

8. The method for modifying low-rank coal according to claim 7, characterized in that: The outer barrel (01), inner barrel (02), and cover (13) are all made of transparent material.

9. The method for modifying low-rank coal according to claim 2, characterized in that: Each of the multiple filter holes (04) is provided with a filter screen.

10. The method for modifying low-rank coal according to claim 2, characterized in that: The distance between the outer wall of the inner barrel (02) and the partition (03) on the inner wall of the outer barrel (01) is (20)-(40) mm.

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