Method and device for accurately regulating and controlling moisture of high-moisture-content lignite

Abstract

The invention discloses a high-water-content lignite moisture accurate regulation and control method and device, and relates to the technical field of lignite treatment device.The high-water-content lignite moisture accurate regulation and control device comprises a rack and further comprises a crushing mechanism connected to the rack, and the input end of the crushing mechanism communicates with a feeding port; the input end of the vacuum dehydration system is communicated with the output end of the crushing mechanism; the input end of the feeding mechanism is communicated with the output end of the vacuum dehydration system; and the input end of the upgrading mechanism communicates with the output end of the feeding mechanism. High-water-content lignite is crushed through the crushing mechanism, water and pulverized coal are separated and collected through the vacuum dehydration system, and ash which affects heat production and pollutes the environment in the pulverized coal is removed through the quality improving mechanism, so that the combustion quality of the lignite powder is improved, and emission of pollutants is reduced; and conveying of the pulverized coal and adding of the corresponding water content are continuously performed through the scraper conveying belt, so that the influence of water and ash in the lignite with the high water content is reduced, and the water in the lignite is accurately regulated and controlled.

Description

Technical Field

[0001] This invention relates to the field of lignite processing equipment technology, and in particular to a method and device for precise moisture control of high-moisture lignite. Background Technology

[0002] Lignite is a type of coal characterized by high moisture content, high volatile matter content, and low calorific value. It is primarily used as fuel in power plants and can also serve as a chemical raw material, catalyst carrier, and adsorbent. Before use, lignite requires dehydration to reduce its moisture content and improve its combustion quality. Furthermore, lignite contains a large amount of ash, which produces black smoke during combustion, easily polluting the environment. Traditionally, high-temperature drying is used for lignite dehydration; however, this process alters the internal composition of the lignite and is energy-intensive.

[0003] In existing technologies, high-temperature hot gas is used to dry lignite, and a swirling flow field is used to apply high-speed shearing force and mechanical stripping to the lignite to complete the dehydration process. However, these methods lack the ability to further regulate the moisture content of the lignite after dehydration, making it impossible to precisely control the moisture content and meet the different usage requirements of lignite. Furthermore, they all lack the removal of ash from the lignite, which can easily affect the combustion quality of the lignite and the accuracy of moisture control. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that after dehydration of lignite, there is a lack of re-regulation of the moisture content in lignite, which makes it impossible to accurately control the moisture content of lignite and meet the different usage requirements of lignite. Therefore, this invention proposes a method and device for precise moisture control of high-moisture lignite.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a device for precise moisture control of high-moisture lignite, comprising a frame, and further comprising: The crushing mechanism is connected to the frame and has a feed inlet at its input end; The vacuum dewatering system has its input end connected to the output end of the crushing mechanism. The feeding mechanism has its input end connected to the output end of the vacuum dehydration system; The upgrading mechanism has an input end connected to the output end of the feeding mechanism. The top of the upgrading mechanism is connected to an inlet pipe and a drain pipe, and a coil mechanism is installed on the side. The inlet pipe is connected to an external liquid nitrogen source. The top of the upgrading mechanism is connected to a discharge port two. When the upgrading mechanism is working, it scoops up the upper layer of mixture inside and seals it to be sent below the drain pipe, and finally sent to the discharge port two.

[0006] In the aforementioned high-moisture lignite moisture precision control device, the crushing mechanism includes a crushing shell, which is fixedly connected to the frame and its top is connected to the feed inlet. Both sides of the crushing shell are connected to a liquid nitrogen atomizing nozzle, the output end of which points downward to the feed inlet. A motor is installed on the crushing shell, and the output end of the motor is sealed and extends into the crushing shell, and is fixedly connected to a crushing wheel. The bottom of the crushing shell is connected to a discharge pipe, and a screen plate is fixedly connected to the port of the discharge pipe and the crushing shell. A vacuum pendulum valve is installed on the discharge pipe, and its bottom end is connected to the vacuum dewatering system.

[0007] In the above-mentioned high-moisture lignite moisture precision control device, the vacuum dewatering system includes a dewatering mechanism, which includes a dewatering shell. The dewatering shell is fixedly connected to the frame and its top is connected to the bottom end of the discharge pipe. A second motor is installed on the side of the dewatering shell. The output end of the second motor is sealed and extends into the dewatering shell and is fixedly connected to a stirring rod. A resistance wire is installed inside the stirring rod and is electrically connected to an external power source. The bottom of the dewatering shell is connected to a second discharge pipe. A second vacuum pendulum valve is installed on the second discharge pipe and its bottom end is connected to the feeding mechanism. A vacuum pump is installed on the frame. The vacuum pump input end is connected to the top of the dehydration shell by a suction pipe, and the output end is connected to a condenser. The output end of the condenser is connected to a water storage tank. Both the condenser and the water storage tank are installed on the frame.

[0008] In the aforementioned high-moisture lignite moisture precision control device, the feeding mechanism includes a feeding shell, which is fixedly connected to the frame and its top is connected to the bottom end of the discharge pipe 2. A rotatable auger 1 is installed inside the feeding shell, and liquid nitrogen atomizing nozzles 2 are connected to both sides. The bottom of the feeding shell is connected to the discharge pipe 3. The output direction of the auger 1 is from the discharge pipe 2 to the discharge pipe 3. The liquid nitrogen atomizing nozzles 2 are located between the discharge pipe 2 and the discharge pipe 3. The bottom end of the discharge pipe 3 is connected to the upgrading mechanism.

[0009] In the above-mentioned high-moisture lignite moisture precision control device, the upgrading mechanism includes an upgrading shell, which is fixedly connected to the frame. A scraper conveyor belt is installed inside the upgrading shell. The scraper conveyor belt is inclined and multiple sealing plates are fixedly connected to the output end. The multiple sealing plates are evenly spaced. The inner wall of the upgrading shell and the sealing plate located at the bottom of the scraper conveyor belt form a working chamber. The top of the working chamber is connected to the bottom three ends of the discharge pipe and to the liquid inlet pipe. The coil mechanism is installed on the outside of the lifting shell and performs electromagnetic induction heating on the inside of the working chamber; The sealing plate at the bottom of the scraper conveyor belt slides and seals against the inner wall of the working chamber during movement. The sealing plate at the top of the scraper conveyor belt slides and seals against the top of the lifting shell. The two adjacent sealing plates at the top of the scraper conveyor belt, the top of the lifting shell, and the output end of the scraper conveyor belt form a sealed space. The bottom end of the drain pipe is connected to the top of the lifting shell and to a sealed space. The bottom of the shell is connected to a discharge port one, and the top is connected to a discharge port two. The input end of discharge port two is directly opposite the sealed space at the top of the scraper conveyor belt, and is used to receive the mixture that is rotated and tilted in this sealed space.

[0010] In the aforementioned high-moisture lignite moisture precision control device, a capacitor level gauge 1 and a capacitor level gauge 2 are installed in the working chamber, and a valve is installed on the inlet pipe. The capacitor level gauge 1, capacitor level gauge 2, and valve are all electrically connected to a controller. The controller is installed on the frame. The controller receives signals from capacitor level gauge 1 and capacitor level gauge 2 and controls the working state of the valve to keep the liquid level in the working chamber between capacitor level gauge 1 and capacitor level gauge 2.

[0011] In the aforementioned high-moisture lignite moisture precision control device, an ionization component is installed on the outside of the upgrading shell. The ionization component includes two electrodes, both of which are electrically connected to an external high-frequency power supply and are installed on both sides of the corresponding sealed space between the drain pipe and the working chamber.

[0012] In the above-mentioned high-moisture lignite moisture precision control device, the inlet end of the drain pipe is connected to the bottom of the water storage tank, a pulverized coal quality control assembly is installed on the scraper conveyor belt, and a metering valve is installed on the drain pipe. Both the pulverized coal quality control assembly and the metering valve are electrically connected to the controller. The controller receives the signal from the pulverized coal quality control assembly and controls the working status of the metering valve.

[0013] In the above-mentioned high-moisture lignite moisture precision control device, a conveyor belt is installed on the frame, and the input end of the conveyor belt is located below the bottom end of the discharge port. The bottom of the lifting shell is connected to a discharge shell, which is fixedly connected to the frame. A rotatable auger II is installed inside the discharge shell, and its bottom end is connected to a discharge port I. The output direction of auger II is towards discharge port I. A vacuum pendulum valve III is installed on discharge port I. A conveyor belt II is installed on the frame, and the input end of conveyor belt II is located below the bottom end of discharge port I.

[0014] A method for precise moisture control of high-moisture lignite includes a device for precise moisture control of high-moisture lignite, and further includes the following steps: S1: Feeding: Feed the high-moisture lignite into the crushing mechanism; S2: Freezing and crushing treatment: Liquid nitrogen is introduced into the crushing mechanism to freeze the lignite, and the crushing mechanism then crushes the frozen lignite. S3: Vacuum dewatering treatment: Lignite of suitable particle size is fed into the vacuum dewatering system from the crushing mechanism. The vacuum dewatering system is evacuated, heated and stirred to remove the moisture from the lignite. S4: Upgrading treatment. The dehydrated lignite is fed from the vacuum dehydration system into the upgrading mechanism by the feeding mechanism. Liquid nitrogen is introduced into the upgrading mechanism, and the lignite in the liquid nitrogen is electromagnetically heated by the coil mechanism, so that the coal powder that is easy to be heated in the liquid nitrogen floats up and the ash that is difficult to be heated sinks down. S5: Moisture control treatment. The lignite powder separated from the ash is scooped up by the upgrading mechanism and sealed and transported to the bottom of the drain pipe. The corresponding water is added through the drain pipe and discharged through the second discharge port, thus completing the moisture control of the lignite powder.

[0015] Compared with existing technologies, the advantages of this invention are: 1. This invention facilitates the crushing and mesh size control of high-moisture lignite by introducing liquid nitrogen into the crushing mechanism. A vacuum dehydration system separates and collects moisture from the coal powder. An upgrading mechanism removes ash from the coal powder, which affects heat generation and environmental pollution, improving the combustion quality of the lignite and reducing pollutant emissions. A scraper conveyor belt continuously transports the coal powder and adds moisture accordingly, thereby reducing the impact of moisture and ash in the high-moisture lignite. This precise control of moisture content in the lignite allows for accurate quality control, meeting diverse application requirements.

[0016] 2. This invention, by setting up a crushing mechanism and introducing liquid nitrogen into the crushing mechanism through a liquid nitrogen atomizing nozzle, can lower the temperature of high-moisture lignite and freeze it, thereby improving the crushing effect of the crushing mechanism on the frozen lignite. Furthermore, the nitrogen gas provides a protective effect on the crushing process of lignite, preventing combustion during the stirring and crushing process, thus improving the crushing effect of lignite.

[0017] 3. This invention sets up a vacuum dehydration system. The vacuum pump works to create a vacuum inside the dehydration mechanism, thereby lowering the boiling point of water. This allows the resistance wire to boil the water at a lower temperature, reducing energy consumption. It also facilitates the rapid condensation of the extracted water vapor. The condensate is stored in a water tank for easy reuse, thus improving the water recycling rate.

[0018] 4. This invention, through the setting of a quality-improving mechanism, allows for the electromagnetic induction heating of coal powder in liquid nitrogen by a coil mechanism. The carbon-containing coal powder generates heat, causing the surrounding nitrogen to vaporize and form bubbles. These bubbles adhere to the surface of the coal powder particles and float, while the ash, which is difficult to heat through induction, continues to sink. The liquid nitrogen level is controlled by a capacitive level gauge, facilitating the scraper conveyor belt to completely scoop up the upper layer of coal powder from the liquid nitrogen through a sealing plate, thus obtaining coal powder with ash removed and improving its quality. Furthermore, the nitrogen in the coal powder is ionized by an ionization component. The plasma generated by the ionization of nitrogen combines with the coal powder, effectively improving its hydrophilicity and facilitating subsequent moisture control. Finally, by weighing the coal powder and adding the appropriate amount of water, precise moisture control of the lignite coal powder can be achieved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the working method and apparatus for precise moisture control of high-moisture lignite proposed in this invention. Figure 2 for Figure 1 A magnified view of part X in the image; Figure 3 for Figure 1 A magnified view of Y in the image; Figure 4 This is an upper half-section isometric view of the method and device for precise moisture control of high-moisture lignite proposed in this invention; Figure 5 for Figure 4 A magnified view of part Z in the image; Figure 6 This is a lower half-section isometric view of the method and device for precise moisture control of high-moisture lignite proposed in this invention.

[0020] In the diagram: 1. Frame, 2. Crushing mechanism, 3. Dewatering mechanism, 4. Vacuum pump, 5. Condenser, 6. Water storage tank, 7. Feeding mechanism, 8. Improving mechanism, 9. Conveyor belt one, 10. Conveyor belt two, 21. Motor one, 22. Vacuum pendulum valve one, 23. Feed inlet, 24. Liquid nitrogen atomizing nozzle one, 25. Crushing wheel, 26. Screen plate, 27. Discharge pipe one, 31. Vacuum pendulum valve two, 32. Discharge pipe two, 33. Motor II. 34. Stirring rod; 41. Suction pipe; 61. Drain pipe; 62. Metering valve; 71. Liquid nitrogen atomizing nozzle II; 72. Discharge pipe III; 73. Screwdriver I; 81. Coil mechanism; 82. Vacuum pendulum valve III; 83. Discharge port I; 84. Capacitive level gauge I; 85. Capacitive level gauge II; 86. Inlet pipe; 87. Electrode; 88. Screwdriver II; 89. Scraper conveyor belt; 810. Sealing plate; 811. Discharge port II. Detailed Implementation

[0021] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] Reference Figures 1-5 A device for precise moisture control of high-moisture lignite includes a frame 1, and also includes: Crushing mechanism 2 is connected to frame 1 and has a feed inlet 23 at its input end.

[0023] The crushing mechanism 2 includes a crushing shell, which is fixedly connected to the frame 1 and its top is connected to the feed inlet 23. Liquid nitrogen atomizing nozzles 24 are connected to both sides of the crushing shell. The output end of the liquid nitrogen atomizing nozzles 24 points below the feed inlet 23. A motor 21 is installed on the crushing shell. The output end of the motor 21 is sealed and extends into the crushing shell and is fixedly connected to a crushing wheel 25. A discharge pipe 27 is connected to the bottom of the crushing shell. A screen plate 26 is fixedly connected to the discharge pipe 27 and the port of communication between the discharge pipe 27 and the crushing shell. A vacuum pendulum valve 22 is installed on the discharge pipe 27 and its bottom end is connected to a vacuum dehydration system.

[0024] The liquid nitrogen atomizing nozzle-24 has its input end connected to an external liquid nitrogen source and is used to spray liquid nitrogen into the crushing shell, thereby cooling and freezing the lignite and improving the crushing effect of the lignite.

[0025] The vacuum dehydration system has its input end connected to the output end of the crushing mechanism 2.

[0026] The vacuum dehydration system includes a dehydration mechanism 3, which includes a dehydration shell. The dehydration shell is fixedly connected to the frame 1, and its top is connected to the bottom of the discharge pipe 27. A motor 33 is installed on the side of the dehydration shell. The output end of the motor 33 is sealed and extends into the dehydration shell, and is fixedly connected to a stirring rod 34. A resistance wire is installed inside the stirring rod 34 and is electrically connected to an external power source. The bottom of the dehydration shell is connected to a discharge pipe 32, and a vacuum pendulum valve 31 is installed on the discharge pipe 32, and its bottom end is connected to the feeding mechanism 7.

[0027] A vacuum pump 4 is installed on the frame 1. A suction pipe 41 is connected between the input end of the vacuum pump 4 and the top of the dehydration shell, and a condenser 5 is connected to the output end of the vacuum pump 4. A water storage tank 6 is connected to the output end of the condenser 5. Both the condenser 5 and the water storage tank 6 are installed on the frame 1.

[0028] The vacuum pump 4 operates, drawing a vacuum inside the dehydration shell through the suction pipe 41, lowering the boiling point of water. This allows the moisture in the lignite to vaporize into water vapor under the heating of the resistance wire, eliminating the need for high-temperature heating and reducing energy consumption. Simultaneously, the water vapor is condensed by the condenser 5 and stored in the water storage tank 6 for convenient subsequent use.

[0029] Reference Figures 1-3 and Figure 6 Feeding mechanism 7, the input end of feeding mechanism 7 is connected to the output end of vacuum dehydration system.

[0030] The feeding mechanism 7 includes a feeding shell, which is fixedly connected to the frame 1 and its top is connected to the bottom end of the discharge pipe 32. A rotatable auger 73 is installed inside the feeding shell, and liquid nitrogen atomizing nozzles 71 are connected to both sides. The bottom of the feeding shell is connected to the discharge pipe 72. The output direction of the auger 73 is from the discharge pipe 32 to the discharge pipe 72. The liquid nitrogen atomizing nozzles 71 are located between the discharge pipe 32 and the discharge pipe 72. The bottom end of the discharge pipe 72 is connected to the quality improvement mechanism 8.

[0031] When the pulverized coal is pushed to the liquid nitrogen atomizing nozzle 71 by the screw conveyor 73, the liquid nitrogen atomizing nozzle 71 sprays liquid nitrogen to rapidly cool the pulverized coal, creating a pre-cooling effect on the lignite pulverized coal, which facilitates subsequent upgrading treatment of the lignite pulverized coal in a liquid nitrogen environment.

[0032] The upgrading mechanism 8 has its input end connected to the output end of the feeding mechanism 7. The top of the upgrading mechanism 8 is connected to the liquid inlet pipe 86 and the drain pipe 61, and a coil mechanism 81 is installed on the side. The liquid inlet pipe 86 is connected to an external liquid nitrogen source. The top of the upgrading mechanism 8 is connected to the discharge port 2 811. When the upgrading mechanism 8 is working, it scoops up the upper layer of mixture inside and seals it to be sent below the drain pipe 61, and finally sent to the discharge port 2 811.

[0033] The quality improvement mechanism 8 includes a quality improvement shell, which is fixedly connected to the frame 1. A scraper conveyor belt 89 is installed inside the quality improvement shell. The scraper conveyor belt 89 is inclined and a plurality of sealing plates 810 are fixedly connected to its output end. The plurality of sealing plates 810 are evenly spaced. The inner wall of the quality improvement shell and the sealing plates 810 located at the bottom of the scraper conveyor belt 89 form a working cavity. The top of the working cavity is connected to the bottom end of the discharge pipe 72 and to the liquid inlet pipe 86.

[0034] The working chamber is equipped with a capacitor level gauge 84 and a capacitor level gauge 85. A valve is installed on the inlet pipe 86. The capacitor level gauge 84, capacitor level gauge 85 and the valve are all electrically connected to a controller. The controller is installed on the frame 1. The controller receives signals from the capacitor level gauge 84 and capacitor level gauge 85 and controls the working state of the valve to keep the liquid level in the working chamber between the capacitor level gauge 84 and capacitor level gauge 85.

[0035] The coil mechanism 81 is installed on the outside of the lifting shell and performs electromagnetic induction heating on the inside of the working chamber.

[0036] The coil mechanism 81 uses existing technology to heat through electromagnetic induction, which can directly generate heat inside the object being heated, improve the precise heating effect of coal powder in liquid nitrogen, and separate the coal powder and the ash mixed in it according to their different behaviors under electromagnetic induction, thereby improving the purification effect of coal powder.

[0037] The sealing plate 810 located at the bottom of the scraper conveyor belt 89 is in a sealing sliding fit with the inner wall of the working chamber during the movement. The sealing plate 810 located at the top of the scraper conveyor belt 89 is in a sealing sliding fit with the top of the lifting shell. The two adjacent sealing plates 810 located at the top of the scraper conveyor belt 89, the top of the lifting shell and the output end of the scraper conveyor belt 89 form a sealed space. The bottom end of the drain pipe 61 is connected to the top of the lifting shell and to a sealed space.

[0038] A coal powder quality control assembly is installed on the scraper conveyor belt 89, and a metering valve 62 is installed on the drain pipe 61. Both the coal powder quality control assembly and the metering valve 62 are electrically connected to the controller. The controller receives the signal from the coal powder quality control assembly and controls the working status of the metering valve 62.

[0039] The coal powder quality control assembly uses existing technology to detect the weight difference between unloaded and loaded coal powder on the scraper conveyor belt 89, calculate the coal powder quality, facilitate water control, and perform coal powder and water mixing ratio to achieve precise control of lignite moisture content.

[0040] The bottom of the shell is connected to a discharge port 83, and the top is connected to a discharge port 811. The input end of the discharge port 811 is directly opposite the sealed space at the top of the scraper conveyor belt 89, and is used to receive the mixture that is rotated and poured in this sealed space.

[0041] Reference Figure 4 The inlet of the drain pipe 61 is connected to the bottom of the water storage tank 6, so that the drain pipe 61 can directly use the water in the water storage tank 6.

[0042] Reference Figure 3 and Figure 6 An ionization assembly is installed on the outside of the shell. The ionization assembly includes two electrodes 87, both of which are electrically connected to an external high-frequency power supply and are installed on both sides of the corresponding sealed space between the drain pipe 61 and the working chamber.

[0043] When the ionization component is working, it ionizes the nitrogen gas in the sealed space through two electrodes 87 to generate plasma. The plasma acts on the surface of the coal powder to increase the hydrophilicity of the coal powder, which facilitates the subsequent mixing of coal powder and water.

[0044] A conveyor belt 9 is installed on the frame 1. The input end of the conveyor belt 9 is located below the bottom end of the discharge port 811, and is used to transport lignite powder with controlled moisture content.

[0045] The bottom of the lifting shell is connected to a discharge shell, which is fixedly connected to the frame 1. A rotatable auger 2 88 is installed inside the discharge shell, and the bottom end is connected to the discharge port 1 83. The output direction of the auger 2 88 is towards the discharge port 1 83. A vacuum pendulum valve 3 82 is installed on the discharge port 1 83. A conveyor belt 2 10 is installed on the frame 1, and the input end of the conveyor belt 2 10 is located below the bottom end of the discharge port 1 83.

[0046] The vacuum pendulum valve 382 and the screw conveyor 288 work together to periodically discharge the ash that has settled at the bottom of the precipitator.

[0047] When using this invention, high-moisture lignite is fed into the crushing mechanism 2 through the feed inlet 23. Liquid nitrogen atomizing nozzles 24 set at the front and rear of the crushing mechanism 2 spray liquid nitrogen to freeze the lignite in the crushing mechanism 2. Motor 21 works, and its output end drives the crushing wheel 25 to rotate, continuously crushing the frozen lignite.

[0048] When the lignite is crushed to the specified mesh size, it can pass through the screen plate 26 and enter the discharge pipe 27. The vacuum pendulum valve 22 is opened to allow the accumulated coal powder to fall into the dewatering mechanism 3.

[0049] Vacuum pump 4 operates, and its input end quickly evacuates the dewatering mechanism 3 through the suction pipe 41. The stirring rod 34 is equipped with a resistance wire, which is energized and heats up to heat the lignite powder in the dewatering shell. Motor 2 33 operates, and its output end drives the stirring rod 34 to continuously stir and tumble the coal powder.

[0050] In a vacuum environment, the boiling point of water decreases. Under the heating of the resistance wire and the stirring of the stirring rod 34, the low-boiling-point water vaporizes rapidly and is drawn away by the vacuum pump 4 and sent to the condenser 5. The condenser 5 condenses the water vapor, and the condensed water is discharged into the water storage tank 6 for storage, which is convenient for subsequent use and improves the water recycling rate.

[0051] After a certain period of time, the coal powder is considered to be completely dehydrated and dried. At this time, the vacuum pendulum valve 31 on the discharge pipe 32 is opened, and the dried coal powder is discharged into the feeding mechanism 7 through the discharge pipe 32. A feedback signal is sent to the vacuum pendulum valve 22 to make the next batch of coal powder enter the dehydration mechanism 3, so that different processing stages of coal powder are carried out simultaneously, thereby improving processing efficiency.

[0052] The auger 73 in the feeding mechanism 7 is rotated in a controlled manner, dividing the coal powder into several equal parts. The auger 73 rotates once in a fixed time to drive the coal powder forward. During the coal powder conveying process, the liquid nitrogen atomizing nozzle 71 pre-cools it.

[0053] Subsequently, the screw conveyor 73 pushes the low-temperature coal powder into the upgrading mechanism 8. The upgrading mechanism 8 introduces liquid nitrogen through the inlet pipe 86. When the liquid nitrogen level reaches the level gauge 84, the valve of the inlet pipe 86 opens to replenish the liquid nitrogen. When the liquid nitrogen level reaches the level gauge 85, the valve of the inlet pipe 86 closes to maintain a stable liquid nitrogen level in the upgrading shell, facilitating continuous coal powder upgrading.

[0054] Coal powder falls into liquid nitrogen and sinks. At this time, the coil mechanism 81 is continuously energized to electromagnetically induction heat the coal powder in the liquid nitrogen. The fixed carbon in the coal powder absorbs electromagnetic waves and is inductively heated. The carbon-containing coal powder generates heat, which vaporizes the surrounding nitrogen and forms bubbles. The bubbles adhere to the surface of the coal powder particles. The buoyancy of the coal powder combined with the bubbles is greater than the gravity, so it floats up. Meanwhile, the ash that is difficult to inductively heat continues to sink.

[0055] At this time, the scraper conveyor belt 89 is working, and its output end rotates by the distance of an adjacent sealing plate 810. When the sealing plate 810 located at the bottom of the scraper conveyor belt 89 rotates, it lifts the floating coal powder out of the liquid nitrogen and sends it into the sealed space to avoid interference with the subsequent coal powder.

[0056] Then the next batch of pulverized coal continues to fall into liquid nitrogen through discharge pipe 372, and scraper conveyor belt 89 repeats the previous action to lift up the floating pulverized coal and carry it forward.

[0057] As the coal powder in the sealed space moves with the scraper conveyor belt 89 and is conveyed to the bottom of the drain pipe 61, the ionization component works. An external high-frequency power supply powers the two electrodes 87, forming a high-frequency electric field that ionizes the nitrogen mixed in the coal powder into plasma. The plasma acts on the surface of the coal powder, increasing its hydrophilicity and facilitating the subsequent mixing of coal powder and water.

[0058] When the pulverized coal advances to below the drain pipe 61, the pulverized coal quality control assembly located there calculates the amount of water to be added and feeds it back to the metering valve 62. The metering valve 62 opens to introduce a fixed amount of water into the sealed space. The water and pulverized coal mix rapidly. As the scraper conveyor belt 89 continues to advance, the pulverized coal receives the added water and finally falls from the discharge port 811 onto the conveyor belt 9, and is then transported to the next process by the conveyor belt 9.

[0059] Vacuum pendulum valve 382 and screw conveyor 288 open at regular intervals to push out the ash that has settled at the bottom of the lifting shell. The ash falls onto conveyor belt 210 and is then transported to the processing section for treatment.

[0060] A method for precise moisture control of high-moisture lignite includes a device for precise moisture control of high-moisture lignite, and further includes the following steps: S1: Feeding: Feed high-moisture lignite into crushing mechanism 2.

[0061] S2: Freezing and Crushing Process: Liquid nitrogen is introduced into the crushing mechanism 2 to freeze the lignite. The crushing mechanism 2 then crushes the frozen lignite.

[0062] The crushing mechanism 2 operates to crush the high-moisture lignite into a set mesh size for subsequent processing.

[0063] S3: Vacuum dewatering treatment: Lignite of suitable particle size is fed into the vacuum dewatering system from the crushing mechanism 2. The vacuum dewatering system is evacuated, heated and stirred to remove the moisture from the lignite.

[0064] After the vacuum dehydration system is evacuated, the boiling point of water decreases. After heating and stirring, the water vaporizes into water vapor, which is then drawn away by the vacuuming device. The vapor is then condensed into water in the condenser 5 and then discharged into the water storage tank 6 for storage, making it convenient for subsequent use and improving the water recycling rate.

[0065] S4: Upgrading treatment. The dehydrated lignite is fed from the vacuum dehydration system into the upgrading mechanism 8 by the feeding mechanism 7. Liquid nitrogen is introduced into the upgrading mechanism 8, and the lignite in the liquid nitrogen is electromagnetically heated by the coil mechanism 81, so that the coal powder that is easy to be heated in the liquid nitrogen floats to the top, and the ash that is difficult to be heated sinks to the bottom.

[0066] By taking advantage of the fact that the ash in lignite is difficult to be heated by electromagnetic induction, the ash can be separated from the lignite, thereby improving the quality of lignite.

[0067] S5: Moisture control treatment. The lignite powder separated from the ash is scooped up by the upgrading mechanism 8 and sealed and transported to the bottom of the drain pipe 61. The corresponding water is added through the drain pipe 61 and discharged through the discharge port 811, thus completing the moisture control of the lignite powder.

[0068] The weight of the upgraded coal powder is measured by the coal powder quality control assembly. The corresponding amount of water is added and mixed with the coal powder by the metering valve 62 on the drain pipe 61, thereby obtaining lignite powder containing an equal proportion of moisture.

[0069] Finally, the lignite powder containing equal amounts of moisture falls onto conveyor belt 9 and is transported to the next processing stage.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for precise moisture control of high-moisture lignite, comprising a frame (1), characterized in that, Also includes: Crushing mechanism (2) is connected to frame (1) and the input end is connected to feed port (23). The vacuum dehydration system is connected to the output of the crushing mechanism (2). The feeding mechanism (7) has its input end connected to the output end of the vacuum dehydration system; The upgrading mechanism (8) has an input end connected to the output end of the feeding mechanism (7). The top of the upgrading mechanism (8) is connected to the liquid inlet pipe (86) and the drain pipe (61), and a coil mechanism (81) is installed on the side. The liquid inlet pipe (86) is connected to the external liquid nitrogen source. The top of the upgrading mechanism (8) is connected to the discharge port two (811). When the upgrading mechanism (8) is working, it scoops up the upper layer of the mixture inside and seals it to be sent below the drain pipe (61) and finally sent to the discharge port two (811).

2. The device for precise moisture control of high-moisture lignite according to claim 1, characterized in that, The crushing mechanism (2) includes a crushing shell, which is fixedly connected to the frame (1) and its top is connected to the feed inlet (23). Both sides of the crushing shell are connected to a liquid nitrogen atomizing nozzle (24). The output end of the liquid nitrogen atomizing nozzle (24) points below the feed inlet (23). A motor (21) is installed on the crushing shell. The output end of the motor (21) is sealed and extends into the crushing shell and is fixedly connected to a crushing wheel (25). The bottom of the crushing shell is connected to a discharge pipe (27). A screen plate (26) is fixedly connected to the discharge pipe (27) and the port of the crushing shell. A vacuum pendulum valve (22) is installed on the discharge pipe (27) and its bottom end is connected to the vacuum dehydration system.

3. The device for precise moisture control of high-moisture lignite according to claim 2, characterized in that, The vacuum dehydration system includes a dehydration mechanism (3), which includes a dehydration shell. The dehydration shell is fixedly connected to the frame (1), and its top is connected to the bottom end of the discharge pipe (27). A motor (33) is installed on the side of the dehydration shell. The output end of the motor (33) is sealed and extends into the dehydration shell, and a stirring rod (34) is fixedly connected to it. A resistance wire is installed inside the stirring rod (34), and the resistance wire is electrically connected to an external power source. The bottom of the dehydration shell is connected to the discharge pipe (32), and a vacuum pendulum valve (31) is installed on the discharge pipe (32), and its bottom end is connected to the feeding mechanism (7). A vacuum pump (4) is installed on the frame (1). The vacuum pump (4) is connected to the top of the dehydration shell by a suction pipe (41), and the output end is connected to a condenser (5). The output end of the condenser (5) is connected to a water storage tank (6). The condenser (5) and the water storage tank (6) are both installed on the frame (1).

4. The device for precise moisture control of high-moisture lignite according to claim 3, characterized in that, The feeding mechanism (7) includes a feeding shell, which is fixedly connected to the frame (1) and its top is connected to the bottom of the discharge pipe (32). A rotatable auger (73) is installed inside the feeding shell, and liquid nitrogen atomizing nozzles (71) are connected to both sides. The bottom of the feeding shell is connected to the discharge pipe (72). The output direction of the auger (73) is from the discharge pipe (32) to the discharge pipe (72). The liquid nitrogen atomizing nozzle (71) is located between the discharge pipe (32) and the discharge pipe (72). The bottom of the discharge pipe (72) is connected to the quality improvement mechanism (8).

5. The device for precise moisture control of high-moisture lignite according to claim 4, characterized in that, The quality improvement mechanism (8) includes a quality improvement shell, which is fixedly connected to the frame (1). A scraper conveyor belt (89) is installed inside the quality improvement shell. The scraper conveyor belt (89) is inclined and a plurality of sealing plates (810) are fixedly connected to the output end. The plurality of sealing plates (810) are evenly spaced. The inner wall of the quality improvement shell and the sealing plate (810) located at the bottom of the scraper conveyor belt (89) form a working chamber. The top of the working chamber is connected to the bottom end of the discharge pipe (72) and to the liquid inlet pipe (86). The coil mechanism (81) is installed on the outside of the lifting shell and performs electromagnetic induction heating on the inside of the working chamber; The sealing plate (810) located at the bottom of the scraper conveyor belt (89) is in a sealing sliding fit with the inner wall of the working chamber during the movement. The sealing plate (810) located at the top of the scraper conveyor belt (89) is in a sealing sliding fit with the top of the lifting shell. The two adjacent sealing plates (810) located at the top of the scraper conveyor belt (89), the top of the lifting shell and the output end of the scraper conveyor belt (89) form a sealed space. The bottom end of the drain pipe (61) is connected to the top of the lifting shell and is also connected to a sealed space. The bottom of the shell is connected to a discharge port 1 (83), and the top is connected to a discharge port 2 (811). The input end of the discharge port 2 (811) is directly opposite the sealed space at the top of the scraper conveyor belt (89), and is used to receive the mixture that is rotated and poured in this sealed space.

6. The device for precise moisture control of high-moisture lignite according to claim 5, characterized in that, Capacitive level gauge 1 (84) and capacitive level gauge 2 (85) are installed in the working chamber. A valve is installed on the inlet pipe (86). Capacitive level gauge 1 (84), capacitive level gauge 2 (85) and valve are electrically connected to a controller. The controller is installed on the frame (1). The controller receives signals from capacitive level gauge 1 (84) and capacitive level gauge 2 (85) and controls the working state of the valve so that the liquid level in the working chamber is between capacitive level gauge 1 (84) and capacitive level gauge 2 (85).

7. The device for precise moisture control of high-moisture lignite according to claim 6, characterized in that, An ionization assembly is installed on the outside of the shell. The ionization assembly includes two electrodes (87). Both electrodes (87) are electrically connected to an external high-frequency power supply and are installed on both sides of the corresponding sealed space between the drain pipe (61) and the working chamber.

8. The device for precise moisture control of high-moisture lignite according to claim 7, characterized in that, The inlet of the drain pipe (61) is connected to the bottom of the water storage tank (6). A coal powder quality control assembly is installed on the scraper conveyor belt (89), and a metering valve (62) is installed on the drain pipe (61). Both the coal powder quality control assembly and the metering valve (62) are electrically connected to the controller. The controller receives the signal from the coal powder quality control assembly and controls the working status of the metering valve (62).

9. The device for precise moisture control of high-moisture lignite according to claim 8, characterized in that, A conveyor belt (9) is installed on the frame (1), and the input end of the conveyor belt (9) is located below the bottom end of the discharge port (811); The bottom of the quality improvement shell is connected to the discharge shell, which is fixedly connected to the frame (1). A rotatable auger (88) is installed inside the discharge shell, and the bottom end is connected to the discharge port (83). The output direction of the auger (88) is pointing to the discharge port (83). A vacuum pendulum valve (82) is installed on the discharge port (83). A conveyor belt (10) is installed on the frame (1), and the input end of the conveyor belt (10) is located below the bottom end of the discharge port (83).

10. A method for precise moisture adjustment of high-moisture lignite, characterized in that, Including the high-moisture-content lignite moisture precision control device as described in claim 9, also Includes the following steps: S1: Feeding: Feed high-moisture lignite into the crushing mechanism (2); S2: Freezing and crushing treatment: Liquid nitrogen is introduced into the crushing mechanism (2) to freeze the lignite, and the crushing mechanism (2) works to crush the frozen lignite; S3: Vacuum dewatering treatment: Lignite of suitable particle size is fed into the vacuum dewatering system from the crushing mechanism (2). The vacuum dewatering system is evacuated, heated and stirred to remove the moisture from the lignite. S4: Upgrading treatment. The dehydrated lignite is fed from the vacuum dehydration system into the upgrading mechanism (8) by the feeding mechanism (7). Liquid nitrogen is introduced into the upgrading mechanism (8), and the lignite in the liquid nitrogen is electromagnetically heated by the coil mechanism (81), so that the coal powder that is easy to be heated in the liquid nitrogen floats up and the ash that is difficult to be heated sinks down. S5: Moisture control treatment, the lignite powder separated from the ash is scooped up by the upgrading mechanism (8) and sealed and transported to the bottom of the drain pipe (61). The corresponding water is added through the drain pipe (61) and discharged through the discharge port two (811), thus completing the moisture control of the lignite powder.

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