Steam dehydration upgrading process and device for lignite with high water content

Abstract

The invention relates to the technical field of lignite steam dehydration, in particular to a high-water-content lignite steam dehydration upgrading process and device, and the high-water-content lignite steam dehydration upgrading process comprises the following process steps: S1, checking and feeding; s2, vibrating and moving up and down; s3, introducing water and heating; s4, evaporating and dehydrating; s5, transferring; s6, carrying out secondary dehydration; comprising a heating frame and a drying cylinder, a drying frame is installed at the top end of the heating frame, the interior of the heating frame communicates with the interior of the drying frame, and an opening penetrates through the top end of the drying frame. According to the device, water flow in the surrounding water pipe can be changed into magnetized water and evaporated, so that the rate of removing free water on the surface of lignite and combined water in the lignite by wet saturated steam can be increased while the lignite is dehydrated and dried by utilizing the wet saturated steam generated after evaporation, and the dehydration and drying efficiency of the lignite is further improved; and the lignite can be subjected to secondary dewatering and drying, so that the moisture content in the lignite is further reduced, and the dewatering and drying quality of the lignite is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of lignite steam dehydration technology, and in particular to a process and apparatus for upgrading lignite with high moisture content by steam dehydration. Background Technology

[0002] Lignite, also known as coking coal, is the lowest grade of coal. It is a low-grade coal between peat and bituminous coal. Although it has a significant price advantage compared to common bituminous or anthracite, lignite has high moisture and volatile matter content, making it easily weathered and broken in the air. It is also highly chemically reactive and prone to spontaneous combustion. These characteristics result in low thermal efficiency when used directly as fuel and make it unsuitable for long-distance transportation in its mined state. To improve the utilization efficiency and transportation quality of lignite, it is necessary to improve its quality (i.e., upgrading). In the process of upgrading lignite, dehydration and drying are particularly important. After dehydration and drying, lignite not only has enhanced stability but also reduces its losses during transportation and storage, and increases its calorific value, thereby improving energy utilization efficiency.

[0003] Existing lignite dehydration and drying technologies can be broadly categorized into evaporative dehydration and non-evaporative dehydration. Evaporative dehydration methods mostly rely solely on heated water to produce steam (i.e., wet saturated steam) for dehydration and drying of lignite. These methods often lack auxiliary means to accelerate heat and mass exchange between the steam and lignite, resulting in relatively low evaporative dehydration efficiency. This not only prolongs the processing time of lignite but also increases energy consumption, thereby raising production costs. Furthermore, when dehydrating and drying lignite with wet saturated steam, the primary focus is on removing free water from the surface of the lignite, with poor removal of deeper moisture such as bound water. This leads to low quality dehydration and drying of lignite, which is prone to reabsorbing moisture after drying, hindering normal transportation and utilization, and thus limiting its practicality. Summary of the Invention

[0004] The purpose of this invention is to address the problem that most existing evaporation dehydration methods for lignite are relatively simple, resulting in relatively low dehydration and drying efficiency and quality of lignite. Therefore, this invention proposes a steam dehydration and upgrading process and apparatus for high-moisture lignite.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A steam dehydration and upgrading process and apparatus for high-moisture lignite includes the following process steps: S1. Inspection and feeding: First, open the sealed door, observe and ensure the stable placement of the placement frame. After inspection, close the sealed door and feed the lignite to be processed into the placement frame through the feeding pipe. S2. Vibration and vertical movement: After the lignite to be processed enters the placement frame, the vibration table and hydraulic rod are started at the same time, so that the placement frame begins to vibrate and move up and down slightly. S3. Water supply and heating: When the lignite on the placement frame is evenly distributed due to its movement, the external water supply device is activated and water is injected into the surrounding water pipe. At the same time, the first coil is energized, and the energized first coil heats the surrounding water pipe. S4. Evaporation and dehydration: The water flowing around the water pipe is heated by the first coil and becomes magnetized water and evaporates. The wet saturated steam generated after evaporation enters the aeration disc and is sprayed out evenly to perform preliminary dehydration and drying of the lignite in the placement frame. S5. After the initial dehydration and drying are completed, the hydraulic rod is controlled to tilt the placement frame, and then the switch valve is opened to allow the lignite in the placement frame to enter the drying cylinder. S6. Secondary dehydration: During lignite transfer, the air pump is started and the second coil is energized, so that the wet saturated steam in the drying frame enters the air outlet pipe and is heated into dry saturated steam by the energized first coil. Then the dry saturated steam enters the drying cylinder to perform secondary dehydration and drying of the lignite. The aforementioned high-moisture lignite steam dehydration and upgrading process uses upgrading equipment including a heating frame and a drying cylinder. A drying frame is installed at the top of the heating frame, and the interior of the heating frame and the interior of the drying frame are connected. An opening is provided through the top of the drying frame, and a sealing door is movably installed at the opening at the top of the drying frame. A feeding pipe is fixedly installed through one side of the drying frame. The unit includes a placement mechanism and a steam dehydration mechanism. The placement mechanism is located inside the drying frame, and the steam dehydration mechanism is located inside the heating frame. The connecting mechanism and the secondary dehydration mechanism are both installed on the drying frame and the drying cylinder.

[0006] Preferably, the placement mechanism includes a vibration lifting assembly and a placement frame. The vibration lifting assembly is disposed inside the drying frame, and the placement frame is placed on the vibration lifting assembly. The placement frame is located below the feeding pipe, and multiple through holes are evenly distributed through the bottom wall of the placement frame.

[0007] Preferably, the vibration lifting assembly includes a vibration table and a mounting plate, which are respectively installed on two opposite side walls inside the drying frame. Two hydraulic rods are installed at the top of the mounting plate, and the bottom of the placement frame contacts the top of the vibration table and the output ends of the two hydraulic rods.

[0008] Preferably, the steam dehydration mechanism includes an installation cavity, a surrounding water pipe, and an aeration disc. The installation cavity is located inside the heating frame, and a first coil is fixedly wound inside the installation cavity. The surrounding water pipe is located on the bottom wall of the heating frame and is situated inside the first coil. The aeration disc is fixedly installed on the inner wall of the drying frame. One end of the surrounding water pipe is fixedly connected to an inlet pipe, and the other end of the surrounding water pipe is connected to the aeration disc. The end of the inlet pipe away from the surrounding water pipe passes through the inner wall of the heating frame and is connected to an external water supply device.

[0009] Preferably, the water pipe is arranged in a double-layer spiral shape to extend the flow path of the water pipe within the first coil.

[0010] Preferably, the aeration disc is located directly below the placement frame to ensure that the steam ejected from the aeration disc can flow evenly to the placement frame.

[0011] Preferably, the connecting mechanism includes a transfer frame, which is fixedly installed on the outer wall of the drying frame. The drying frame is connected to the inside of the drying cylinder through the transfer frame. The end of the transfer frame facing the drying frame corresponds to the position of the hydraulic rod, and a switch valve is installed on the transfer frame. The end of the placement frame facing the transfer frame is provided with a through-hole.

[0012] Preferably, the secondary dehydration mechanism includes an air pump, which is fixedly installed on the outer wall of the drying frame. An air suction pipe is installed at the input end of the air pump, and the air pump is connected to the inside of the drying frame through the air suction pipe. An air outlet pipe is installed at the output end of the air pump, and an air inlet pipe is installed at the end of the air outlet pipe away from the air pump. The air outlet pipe is connected to the inside of the drying cylinder through the air inlet pipe. A heating component is provided on the air outlet pipe for heating the air outlet pipe.

[0013] Preferably, the heating assembly includes a protective frame, which is fixedly installed on the air outlet pipe, and a second coil is installed inside the protective frame, which is distributed in a spiral shape around the air outlet pipe.

[0014] Preferably, the protective frame is made of a heat-insulating composite material to prevent the heat generated by the second coil after energization from dissipating to the outside.

[0015] Compared with the prior art, the advantages of the present invention are as follows: 1. This invention, through the coordinated operation of a placement mechanism, a steam dehydration mechanism, a connecting mechanism, and a secondary dehydration mechanism, utilizes the double-layered spiral arrangement surrounding the water pipe and the magnetic field of the first coil after energization to transform the water flow within the surrounding water pipe into magnetized water and evaporate it. This allows for the dehydration and drying of lignite using the wet saturated steam generated after evaporation, while simultaneously increasing the removal rate of free water on the surface and bound water within the lignite, thereby improving the dehydration and drying efficiency of the lignite. Furthermore, the dry saturated steam heated by the wet saturated steam can be used to evaporate the moisture tightly bound within the lignite (i.e., perform secondary dehydration and drying of the lignite), further reducing the moisture content in the lignite and effectively improving the quality of lignite dehydration and drying.

[0016] 2. This invention utilizes magnetized water within the steam dehydration mechanism surrounding the water pipe to decompose easily scale-forming substances such as calcium carbonate and magnesium carbonate on the pipe wall, transforming them into loose bicarbonate that is less prone to accumulation within the pipe wall. This effectively reduces the risk of scaling within the pipe wall, maintains stable heat transfer efficiency, and ensures normal heating of the water flow inside the pipe. Furthermore, the magnetic field of the first coil after energization influences the orientation and arrangement of water molecules within the lignite placed on the frame, reducing the surface tension of the liquid water and accelerating the migration of moisture from the capillaries within the lignite to the surface, thereby further improving the dehydration and drying efficiency of the lignite.

[0017] 3. By incorporating a vibrating lifting component in the placement mechanism, this invention ensures the uniform distribution of lignite on the placement frame before dehydration and drying, and ensures that each piece of lignite is fully exposed to steam during dehydration and drying. This avoids uneven dehydration and drying of the lignite and effectively guarantees the quality of lignite dehydration and drying. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall isometric structure of a steam dehydration and upgrading device for high-moisture lignite proposed in this invention. Figure 2 This is a schematic diagram of the drying frame and heating frame structure of a steam dehydration and upgrading device for high-moisture lignite proposed in this invention; Figure 3 This is a schematic diagram of the internal structure of the drying frame of a steam dehydration and upgrading device for high-moisture lignite proposed in this invention; Figure 4 This is a schematic diagram of the inlet pipe and surrounding water pipe structure of a steam dehydration and upgrading device for high-moisture lignite proposed in this invention. Figure 5 This is a schematic diagram of the first and second coils of a steam dehydration and upgrading device for high-moisture lignite proposed in this invention. Figure 6This is a schematic diagram of the placement frame and through-hole structure of a steam dehydration and upgrading device for high-moisture lignite proposed in this invention; Figure 7 This is a half-sectional schematic diagram of the drying frame and heating frame of a steam dehydration and upgrading device for high-moisture lignite proposed in this invention.

[0019] In the diagram: 1. Drying frame, 2. Sealing door, 3. Heating frame, 4. Feeding pipe, 5. Drying cylinder, 6. Protective frame, 7. Transfer frame, 8. Switch valve, 9. Water inlet pipe, 10. Surrounding water pipe, 11. First coil, 12. Second coil, 13. Suction pipe, 14. Air pump, 15. Air outlet pipe, 16. Air inlet pipe, 17. Placement frame, 18. Through hole, 19. Hydraulic rod, 20. Vibrating table, 21. Aeration disc, 22. Mounting cavity, 23. Mounting plate. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figures 1 to 7 A steam dehydration and upgrading process for high-moisture lignite includes the following process steps: S1. Inspection and feeding: First, open the sealing door 2, observe and ensure that the placement frame 17 is placed securely. After the inspection is completed, close the sealing door 2 and let the lignite to be processed enter the placement frame 17 through the feeding pipe 4. S2. Vibration and up-and-down movement: After the lignite to be processed enters the placement frame 17, the vibration table 20 and hydraulic rod 19 are started at the same time, so that the placement frame 17 begins to vibrate and move up and down slightly. S3. Water supply and heating: When the lignite on the placement frame 17 is evenly distributed due to its movement, the external water supply device is activated and water is injected into the surrounding water pipe 10. At the same time, the first coil 11 is energized, and the energized first coil 11 heats the surrounding water pipe 10. S4. Evaporation and dehydration: The water flowing around the water pipe 10 is heated by the first coil 11 and becomes magnetized water and evaporates. The wet saturated steam generated after evaporation enters the aeration disc 21 and is sprayed out evenly to perform preliminary dehydration and drying of the lignite in the placement frame 17. S5. After the initial dehydration and drying are completed, control the hydraulic rod 19 to tilt the placement frame 17, and then open the switch valve 8 to allow the lignite in the placement frame 17 to enter the drying cylinder 5. S6. Secondary dehydration: During lignite transfer, the air pump 14 is started and the second coil 12 is energized, so that the wet saturated steam in the drying frame 1 enters the air outlet pipe 15 and is heated into dry saturated steam by the energized first coil 11. Then the dry saturated steam enters the drying cylinder 5 to perform secondary dehydration and drying of the lignite.

[0022] Reference Figures 1 to 7 A steam dehydration and upgrading device for high-moisture lignite includes a heating frame 3 and a drying cylinder 5. A drying frame 1 is installed at the top of the heating frame 3, and the interior of the heating frame 3 and the interior of the drying frame 1 are connected. An opening is provided through the top of the drying frame 1, and a sealing door 2 is movably installed at the opening at the top of the drying frame 1. A feeding pipe 4 is fixedly installed through one side of the drying frame 1, and a placement mechanism is provided inside the drying frame 1 for placing the lignite to be processed and ensuring the uniform distribution of the lignite. The placement mechanism includes a vibration lifting assembly and a placement frame 17. The vibration lifting assembly is set inside the drying frame 1, and the placement frame 17 is placed on the vibration lifting assembly and is located below the feeding pipe 4. Multiple through holes 18 are uniformly provided through the bottom wall of the placement frame 17. The vibration lifting assembly includes a vibration table 20 and a mounting plate 23. The vibration table 20 and the mounting plate 23 are respectively installed on two opposite side walls inside the drying frame 1. Two hydraulic rods 19 are installed at the top of the mounting plate 23. The bottom end of the placement frame 17 is in contact with the top end of the vibration table 20 and the output ends of the two hydraulic rods 19.

[0023] Reference Figures 2 to 7 A steam dehydration mechanism is installed inside the heating frame 3 to perform preliminary dehydration and drying of the lignite placed in the placement frame 17. The steam dehydration mechanism includes an installation cavity 22, a surrounding water pipe 10, and an aeration disc 21. The installation cavity 22 is located inside the heating frame 3, and a first coil 11 is fixedly wound inside the installation cavity 22. The surrounding water pipe 10 is located on the bottom wall of the heating frame 3 and is located inside the first coil 11. The aeration disc 21 is fixedly installed on the inner wall of the drying frame 1. One end of the surrounding water pipe 10 is fixedly connected to a water inlet pipe 9, and the other end of the surrounding water pipe 10 is connected to the aeration disc 21. The aeration disc 21 is existing technology, and its specific structural design will not be described in detail here. The end of the water inlet pipe 9 away from the surrounding water pipe 10 is... The heating frame 3 is connected to the external water supply device and is arranged in a double-layer spiral around the water pipe 10. The aeration disc 21 is located directly below the placement frame 17 to ensure that the steam sprayed by the aeration disc 21 can flow evenly to the placement frame 17. The drying frame 1 and the drying cylinder 5 are provided with a communication mechanism to allow the lignite that has completed the initial dehydration and drying to enter the drying cylinder 5. The communication mechanism includes a transfer frame 7, which is fixedly installed on the outer wall of the drying frame 1. The drying frame 1 is connected to the inside of the drying cylinder 5 through the transfer frame 7. The end of the transfer frame 7 facing the drying frame 1 corresponds to the position of the hydraulic rod 19, and a switch valve 8 is installed on the transfer frame 7. The end of the placement frame 17 facing the transfer frame 7 is provided with a through port.

[0024] Reference Figures 1 to 5A secondary dewatering mechanism is provided on the drying frame 1 and the drying cylinder 5 for secondary dewatering and drying of the lignite inside the drying cylinder 5. The secondary dewatering mechanism includes an air pump 14, which is fixedly installed on the outer wall of the drying frame 1. An air suction pipe 13 is installed at the input end of the air pump 14, which is connected to the inside of the drying frame 1 through the air suction pipe 13. An air outlet pipe 15 is installed at the output end of the air pump 14, and an air inlet pipe 16 is installed at the end of the air outlet pipe 15 away from the air pump 14. The air outlet pipe 15 is connected to the inside of the drying cylinder 5 through the air inlet pipe 16. The air outlet pipe 15 is equipped with... A heating assembly is used to heat the vent pipe 15. The heating assembly includes a protective frame 6, which is fixedly installed on the vent pipe 15. A second coil 12 is installed inside the protective frame 6. The second coil 12 is distributed in a spiral shape around the vent pipe 15. The protective frame 6 is made of heat-insulating composite material. The protective frame 6 is used to prevent the second coil 12 from being physically damaged during operation. At the same time, since the protective frame 6 is made of heat-insulating composite material, it can also prevent the heat generated by the second coil 12 during operation from dissipating to the outside, thereby better heating the vent pipe 15.

[0025] When using this invention, first open the sealing door 2, observe and ensure that the placement frame 17 is securely placed on the vibration table 20 and hydraulic rod 19, then close the sealing door 2, and pour the lignite to be processed into the placement frame 17 through the feeding pipe 4. Then start the vibration table 20 and the hydraulic rod 19, so that the output end of the hydraulic rod 19 begins to move up and down in a regular, small amplitude, thereby causing the placement frame 17 to vibrate and move up and down in a small amplitude. Under the vibration action of the vibration table 20 and the movement action of the hydraulic rod 19, the lignite in the placement frame 17 will gradually be evenly distributed.

[0026] After the lignite is evenly distributed on the placement frame 17, the external water supply device is activated and water is injected into the surrounding water pipe 10. At the same time, the first coil 11 is energized. The energized first coil 11 will generate a magnetic field and heat the water flow in the surrounding water pipe 10. Since the surrounding water pipe 10 is arranged in a double spiral shape, the water flow in the surrounding water pipe 10 will flow through the outer spiral and the inner spiral in sequence. This path prolongs the time for the water flow to be heated by the first coil 11, ensuring that the water flow can be fully heated to the temperature required for evaporation. The wet saturated steam generated after the water flow evaporates will then enter the aeration disc 21 and flow towards the placement frame through the aeration disc 21. The uniformly sprayed wet saturated steam will pass through the through hole 18 and come into contact with the moving lignite inside the placement frame 17. During the contact process, small droplets in the steam will condense on the surface of the lignite. This condensation process will release latent heat, which will transfer heat to the free water on the surface of the lignite, causing it to evaporate. The release of latent heat will also cause the moisture inside the lignite to gradually migrate to the surface and be evaporated by the heat in the steam, thus completing the initial dehydration and drying of the lignite. The continuous movement of the lignite ensures that each piece of lignite can fully contact the steam, thereby avoiding the problem of uneven dehydration and drying, and effectively ensuring the quality of dehydration and drying of the lignite.

[0027] Meanwhile, the flow path of the water in the aforementioned surrounding water pipe 10 also prolongs the time it takes for the water to pass through the magnetic field of the first coil 11. During this extended process, the water has more opportunities to cut magnetic field lines and be magnetized. Compared with ordinary water, magnetized water has a lower surface tension and enhanced permeability. Therefore, the steam generated by the evaporation of magnetized water can more easily penetrate into the pores of lignite, thereby increasing the removal rate of free water on the surface of lignite and bound water inside, and thus improving the dehydration and drying efficiency of lignite. The magnetic field generated by the first coil 11 can affect the orientation and arrangement of water molecules inside the lignite on the placement frame 17, reduce the surface tension of liquid water, thereby accelerating the migration of water in the capillaries inside the lignite to the surface, and further improving the dehydration and drying efficiency of lignite.

[0028] In addition, as a key component for water heating and transmission, the inner wall of the surrounding water pipe 10 is prone to scaling after long-term use. Magnetized water decomposes calcium carbonate, magnesium carbonate and other substances that are prone to scaling and converts them into loose bicarbonate that is not easy to accumulate in the inner wall. This effectively reduces the risk of scaling in the inner wall of the surrounding water pipe 10, maintains the stability of the heat transfer efficiency of the surrounding water pipe 10, and thus effectively ensures the normal heating of the water flow inside the surrounding water pipe 10 by the first coil 11 after being energized.

[0029] After the initial dehydration and drying of the lignite is completed, the hydraulic rod 19 is activated and its output end is lowered to its lowest position. At this time, the placement frame 17 will tilt towards the transfer frame 7. As the vibration table 20 vibrates the placement frame 17, the lignite in the placement frame 17 will enter the transfer frame 7. Then, the switch valve 8 in the transfer frame 7 is opened, allowing the lignite to be transferred into the drying cylinder 5. Once the transfer is complete, the switch valve 8 is closed. During the lignite transfer process, the suction pump 14 is activated and the second coil 12 is energized, allowing the wet saturated steam in the drying frame 1 to enter the exhaust pipe 15. The exhaust pipe 15 is then heated by the energized first coil 11, thereby allowing the exhaust pipe 15 to produce steam. The wet saturated steam in cylinder 5 is converted into dry saturated steam. This dry saturated steam then enters the drying cylinder 5 through inlet pipe 16 for secondary dehydration and drying of the lignite. Since the moisture content of the lignite has been significantly reduced after this initial dehydration and drying, using dry saturated steam as a heat source at this stage allows for more effective penetration into the pore structure of the lignite. Furthermore, because dry saturated steam not only has high-temperature characteristics but also maintains a high degree of dryness, it can penetrate deep into the interior of the lignite and evaporate the tightly bound moisture (i.e., bound water), thereby further reducing the moisture content of the lignite and effectively improving the quality of lignite dehydration and drying.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A steam dehydration and upgrading process for high-moisture lignite, characterized in that, The process includes the following steps: S1. Inspection and feeding: First, open the sealing door (2), observe and ensure that the placement frame (17) is placed securely. After the inspection is completed, close the sealing door (2) and feed the lignite to be processed into the placement frame (17) through the feeding pipe (4). S2. Vibration and up-and-down movement: After the lignite to be processed enters the placement frame (17), the vibration table (20) and hydraulic rod (19) are started at the same time, so that the placement frame (17) begins to vibrate and move up and down slightly. S3. Water supply and heating: When the lignite on the placement frame (17) is evenly distributed due to its movement, the external water supply device is activated and water is injected into the surrounding water pipe (10). At the same time, the first coil (11) is energized and the energized first coil (11) heats the surrounding water pipe (10). S4. Evaporation and dehydration: The water flowing around the water pipe (10) is heated by the first coil (11) and becomes magnetized water and evaporates. The wet saturated steam generated after evaporation enters the aeration plate (21) and is sprayed out evenly to perform preliminary dehydration and drying on the lignite in the placement frame (17). S5. After the initial dehydration and drying are completed, control the hydraulic rod (19) to tilt the placement frame (17), and then open the switch valve (8) so that the lignite in the placement frame (17) enters the drying cylinder (5); S6. Secondary dehydration: When the lignite is transferred, the air pump (14) is started and the second coil (12) is energized, so that the wet saturated steam in the drying frame (1) enters the air outlet pipe (15) and is heated into dry saturated steam by the energized first coil (11). Then the dry saturated steam enters the drying cylinder (5) to perform secondary dehydration and drying of the lignite. The above-mentioned high-moisture lignite steam dehydration and upgrading process uses upgrading equipment including a heating frame (3) and a drying cylinder (5) at the top of the heating frame (3), and the interior of the heating frame (3) and the interior of the drying frame (1) are connected. The top of the drying frame (1) has an opening, and a sealing door (2) is movably installed at the opening at the top of the drying frame (1). A feeding pipe (4) is fixedly installed on one side of the drying frame (1). The placement mechanism and the steam dehydration mechanism are arranged in the drying frame (1) and the steam dehydration mechanism is arranged in the heating frame (3); The connecting mechanism and the secondary dehydration mechanism are both set on the drying frame (1) and the drying cylinder (5).

2. The steam dehydration and upgrading device for high-moisture lignite according to claim 1, characterized in that, The placement mechanism includes a vibration lifting assembly and a placement frame (17). The vibration lifting assembly is set inside the drying frame (1), and the placement frame (17) is placed on the vibration lifting assembly. The placement frame (17) is located below the feeding pipe (4). Multiple through holes (18) are evenly provided on the bottom wall of the placement frame (17).

3. The steam dehydration and upgrading device for high-moisture lignite according to claim 2, characterized in that, The vibration lifting assembly includes a vibration table (20) and a mounting plate (23). The vibration table (20) and the mounting plate (23) are respectively installed on two opposite side walls inside the drying frame (1). Two hydraulic rods (19) are installed at the top of the mounting plate (23). The bottom of the placement frame (17) is in contact with the top of the vibration table (20) and the output ends of the two hydraulic rods (19).

4. The steam dehydration and upgrading device for high-moisture lignite according to claim 3, characterized in that, The steam dehydration mechanism includes an installation cavity (22), a surrounding water pipe (10), and an aeration disc (21). The installation cavity (22) is located inside the heating frame (3), and a first coil (11) is fixedly wound inside the installation cavity (22). The surrounding water pipe (10) is located on the bottom wall of the heating frame (3), and the surrounding water pipe (10) is located inside the first coil (11). The aeration disc (21) is fixedly installed on the inner wall of the drying frame (1). One end of the surrounding water pipe (10) is fixedly connected to an inlet pipe (9), and the other end of the surrounding water pipe (10) is connected to the aeration disc (21). The end of the inlet pipe (9) away from the surrounding water pipe (10) passes through the inner wall of the heating frame (3) and is connected to an external water supply device.

5. A steam dehydration and upgrading device for high-moisture lignite according to claim 4, characterized in that, The water pipe (10) is arranged in a double spiral shape to extend the flow path of the water pipe (10) within the first coil (11).

6. The steam dehydration and upgrading device for high-moisture lignite according to claim 4, characterized in that, The aeration disc (21) is located directly below the placement frame (17) to ensure that the steam sprayed from the aeration disc (21) can flow evenly to the placement frame (17).

7. A steam dehydration and upgrading device for high-moisture lignite according to claim 3, characterized in that, The connecting mechanism includes a transfer frame (7), which is fixedly installed on the outer wall of the drying frame (1). The drying frame (1) is connected to the inside of the drying cylinder (5) through the transfer frame (7). The end of the transfer frame (7) facing the drying frame (1) corresponds to the position of the hydraulic rod (19). A switch valve (8) is installed on the transfer frame (7). The end of the placement frame (17) facing the transfer frame (7) is provided with a through port.

8. A steam dehydration and upgrading device for high-moisture lignite according to claim 1, characterized in that, The secondary dehydration mechanism includes an air pump (14), which is fixedly installed on the outer wall of the drying frame (1). An air suction pipe (13) is installed at the input end of the air pump (14). The air pump (14) is connected to the inside of the drying frame (1) through the air suction pipe (13). An air outlet pipe (15) is installed at the output end of the air pump (14). An air inlet pipe (16) is installed at the end of the air outlet pipe (15) away from the air pump (14). The air outlet pipe (15) is connected to the inside of the drying cylinder (5) through the air inlet pipe (16). A heating component is provided on the air outlet pipe (15) for heating the air outlet pipe (15).

9. A steam dehydration and upgrading device for high-moisture lignite according to claim 8, characterized in that, The heating assembly includes a protective frame (6), which is fixedly installed on the air outlet pipe (15), and a second coil (12) is installed inside the protective frame (6). The second coil (12) is distributed in a spiral shape around the air outlet pipe (15).

10. A steam dehydration and upgrading device for high-moisture lignite according to claim 9, characterized in that, The protective frame (6) is made of heat-insulating composite material to prevent the heat emitted by the second coil (12) after being energized from dissipating to the outside.

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