High volatile bituminous coal safety injection components and blast furnace pulverized coal injection equipment and their usage methods

Abstract

This invention belongs to the technical field of blast furnace pulverized coal injection equipment, particularly the safety injection component for high-volatile bituminous coal and the blast furnace pulverized coal injection equipment and its usage method. Addressing the problems of low combustion rate, substandard pulverized coal particle size, and susceptibility to moisture absorption during pulverized coal storage, this component features an insulation sleeve on the outer wall of the injection pipe, preheating the pulverized coal with blast furnace exhaust gas to reduce heating energy consumption and promote rapid ignition. A spiral plate inside the injection pipe enhances the mixing of pulverized coal and nitrogen, and an electric push rod at the top controls a bending plate to adjust the pulverized coal injection angle, strengthening airflow disturbance and increasing the contact area between pulverized coal and oxygen. The blast furnace pulverized coal injection equipment includes a grinding cylinder and a storage box. The grinding cylinder has a multi-stage grinding structure, with a rotating shaft driving a grinding wheel to perform primary and secondary grinding of the pulverized coal, ensuring uniform particle size. The storage box utilizes exhaust gas heat to dry the pulverized coal and suppress spontaneous combustion. By optimizing the preheating, grinding, injection, and storage processes, the equipment improves the pulverized coal combustion rate and utilization rate, ensuring production safety.

Description

Technical Field

[0001] This invention relates to the field of blast furnace pulverized coal injection equipment, and particularly to a safe injection assembly for high-volatile bituminous coal, a blast furnace pulverized coal injection equipment, and its usage method. Background Technology

[0002] Pulverized coal injection in blast furnaces refers to the direct injection of finely ground anthracite, bituminous coal, or a mixture of both into the blast furnace through the tuyeres. During the blast furnace smelting process, it replaces coke to provide heat and act as a reducing agent, thereby reducing the coke ratio and lowering the cost of pig iron.

[0003] The existing technology still has the following disadvantages when performing pulverized coal injection operations:

[0004] 1. In the existing technology, coal is directly crushed and ground into powder for storage, which is convenient for subsequent pulverized coal injection operations. However, there is often only one grinding process, which results in the coal powder particle size not meeting the target and affecting the combustion rate of the coal powder.

[0005] 2. During the storage of pulverized coal, it is impossible to dry the pulverized coal effectively, resulting in a high moisture content in the pulverized coal. This leads to a greater heat energy required for the pulverized coal to burn during subsequent pulverized coal injection, and this combustion also reduces the pulverized coal combustion rate. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing methods that only involve one grinding process, resulting in substandard coal powder particle size and easy moisture absorption during coal powder storage, leading to a decrease in coal powder combustion rate in the later stages. The invention proposes a high-volatile bituminous coal safety injection component and blast furnace pulverized coal injection equipment, as well as its usage method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The high-volatile bituminous coal safety injection system includes:

[0009] The nozzle has a top fixed with a pulverized coal injection pipe. The outer wall of the injection pipe is equipped with a solenoid valve I. One end of the nozzle is fixed with a fan I for injecting nitrogen into the nozzle via a bracket. The outlet of the fan I extends into the nozzle via a pipe to allow the pulverized coal to be discharged to the other end of the nozzle with the nitrogen flow. The nozzle is fixed with a nozzle at the end of the nozzle away from the fan I, and one end of the nozzle extends into the blast furnace to inject the pulverized coal into the blast furnace for combustion.

[0010] A preheating structure is used to preheat the pulverized coal in the injection pipe, reducing the energy required for the pulverized coal to reach the combustion point. The preheating structure includes an insulation sleeve fixedly fitted on the outer wall of the injection pipe. An air inlet pipe and an air outlet pipe are fixedly connected to the top two sides of the insulation sleeve, respectively. The top end of the air inlet pipe is connected to the flue gas outlet of the blast furnace through a pipe, which is used to inject the blast furnace exhaust gas into the insulation sleeve to preheat the pulverized coal.

[0011] In this process, blast furnace exhaust gas is injected into the insulation jacket through the inlet pipe. The heat of the exhaust gas is used to preheat the pulverized coal in the injection pipe, reducing the amount of heat required to heat the pulverized coal airflow to the ignition temperature, promoting the rapid ignition of high-volatile bituminous coal, and improving the combustion rate.

[0012] In one possible design, the preheating structure further includes a fixing ring located inside the insulation sleeve and fixedly fitted onto the outer wall of the spray pipe, and positioned between the inlet pipe and the outlet pipe. The fixing ring has a through hole for allowing the exhaust gas to move through the through hole to below the outlet pipe. A spiral plate is fixed inside the spray pipe for causing the pulverized coal and nitrogen to rotate and mix under the action of the spiral plate.

[0013] The exhaust gas flows through the through-hole to the outlet pipe and is discharged, while the spiral plate promotes the full mixing of pulverized coal and nitrogen, further optimizing the preheating effect.

[0014] In one possible design, an electric push rod is fixed to the top of the spray pipe, and a fixed rod is fixed to the output shaft of the electric push rod. One end of the fixed rod extends slidably into the blast furnace, and a connecting rod is fixed to the bottom of the fixed rod via a vertical rod. A horizontal rod is fixedly inserted through the connecting rod and is slidably connected to the spray nozzle. A bending plate is fixed to one end of the connecting rod, and the bending plate has two arc surfaces at the end near the spray nozzle.

[0015] Among them, the electric push rod drives the bending plate to move through the connecting rod, controls the distance between the bending plate and the injection nozzle, and the arc surface is used to guide the coal powder into the blast furnace at an angle, strengthens the disturbance to improve the mixing of airflow and coal powder, increases the contact area between coal powder and oxygen, and improves the chemical reaction rate and combustion rate.

[0016] The blast furnace pulverized coal injection equipment includes the above-mentioned high volatile bituminous coal safety injection assembly, and also includes a grinding cylinder and a storage box. The grinding cylinder is provided with a crushing structure for crushing coal blocks. The crushing structure includes a crushing ring fixed to the inner wall of the grinding cylinder and a crushing cone platform disposed below the crushing ring.

[0017] A multi-stage grinding structure is used to grind pulverized coal blocks to a specified particle size multiple times. The multi-stage grinding structure includes multiple grinding wheels I and grinding wheels II.

[0018] The drying structure is used to transport the pulverized coal ground in the grinding cylinder to the storage box for drying and storage.

[0019] The coal powder is crushed and ground, and then dried to ensure uniform particle size and dryness, thereby improving injection efficiency and combustion rate.

[0020] In one possible design, the crushing structure further includes a rotating shaft rotatably connected to the inner wall of the bottom of the grinding cylinder. A drive motor is fixed to the bottom of the grinding cylinder via a bracket. The output shaft of the drive motor extends rotatably into the grinding cylinder and is fixedly connected to the bottom end of the rotating shaft. A hydraulic chamber is provided at the bottom of the crushing cone. The top end of the rotating shaft extends into the hydraulic chamber and is slidably connected via a groove and a slider, used to drive the rotating shaft to rotate the hydraulic chamber. A piston plate is fixed to the top of the rotating shaft and slidably sealed to the inner wall of the hydraulic chamber. Multiple hydraulic cylinders are fixed to the bottom of the crushing cone, and the tops of the multiple hydraulic cylinders are connected to the hydraulic chamber via... The conduit is fixedly connected. A piston block is slidably connected inside the hydraulic cylinder. A piston rod is fixed to the end of the piston block away from the rotating shaft. One end of the piston rod extends slidably to one side of the hydraulic cylinder. A tension spring is fixed between one side of the piston block and one side of the inner wall of the hydraulic cylinder through a spring seat. A roller is rotatably connected to the end of the piston rod away from the piston block. Multiple arc-shaped protrusions are fixed to the inner wall of the grinding cylinder, and the arc-shaped protrusions cooperate with the roller to drive the piston rod to move and inject the hydraulic oil in the hydraulic cylinder into the hydraulic chamber. Multiple crushing protrusions are fixed to the top of the crushing cone platform to crush the coal block when the crushing cone platform moves up and rotates.

[0021] The drive motor drives the rotating shaft to rotate, which in turn drives the crushing cone to rotate. At the same time, the piston rod and the arc-shaped protrusion work together to push the piston block to move. Hydraulic oil is injected into the hydraulic chamber through the conduit to push the crushing cone to move up and down, realizing rotation and vertical compound motion, which quickly crushes coal into small-diameter coal blocks, making it easier for subsequent grinding.

[0022] In one possible design, the multi-stage grinding structure further includes a conical plate II fixed to the inner wall of the grinding cylinder and located below the crushing conical platform. The conical plate II is concave and has a circular hole at its center. Multiple connecting plates located above the conical plate II are fixed to the outer wall of the rotating shaft. Each of the multiple connecting plates is rotatably connected to a grinding wheel I, which is used to grind the broken coal pieces on the conical plate II when the rotating shaft drives the grinding wheel I to revolve. A fixing pipe is fixed to the outer wall of the rotating shaft and is located inside the circular hole. The outer wall of the fixing pipe has an annular groove, and multiple grinding wheels II are rotatably arranged in the annular groove. The grinding wheels II are in contact with the inner wall of the circular hole and are used to perform secondary grinding of the coal powder passing through the circular hole by the grinding wheels II when the rotating shaft drives the fixing pipe to rotate.

[0023] In this process, the coal block falls onto the conical plate II and moves towards the center. The rolling wheel I performs initial grinding, and the coal powder undergoes secondary grinding when it passes through the gap between the conical plate II and the fixed pipe, forming small-diameter coal powder and improving the combustion rate.

[0024] In one possible design, the drying structure includes a drying pipe network fixed inside the storage tank near the bottom. The bottom of the drying pipe network has multiple air outlets for injecting hot gas into the storage tank to dry the pulverized coal. A connecting pipe is fixedly installed inside the storage tank, with one end connected to the drying pipe network and the other end connected to the air outlet pipe for reusing the waste gas in the air outlet pipe. The top end of an injection pipe is fixed to the bottom of the storage tank and connected to the storage tank for injecting the pulverized coal from the storage tank into the injection pipe. The bottom of the grinding cylinder is fixedly connected to a conveying pipe. One end of the conveying pipe is fixedly inserted through the top inner wall of the storage box. A blower II is fixedly attached to the bottom of the grinding cylinder by a bracket. The air outlet of the blower II extends into the conveying pipe through a pipe for injecting air into the conveying pipe, so that the coal powder is injected into the storage box for storage. An exhaust pipe is fixedly inserted through the top of the storage box for discharging the gas in the storage box. A cloth bag is fixedly attached to the bottom of the exhaust pipe for filtering the coal powder in the discharged gas. Solenoid valves II are installed on both the connecting pipe and the exhaust pipe.

[0025] Among them, blower II blows air into the conveying pipe to push the pulverized coal into the storage box, the exhaust pipe discharges excess air, the filter bag prevents the pulverized coal from spilling out, and the low-oxygen exhaust gas in the exhaust pipe is injected into the drying network through the connecting pipe to dry the pulverized coal and inhibit the spontaneous combustion or explosion of the pulverized coal.

[0026] In one possible design, a conical plate I is fixed to the bottom of the fixed tube for distributing the ground coal powder in all directions. Multiple semicircular blocks are fixed to the bottom of the conical plate I. A conical sieve plate located below the conical plate I is fixed inside the grinding cylinder for screening the coal powder. Multiple protruding rods are fixed to the top of the conical sieve plate, and the protruding rods cooperate with the semicircular blocks to drive the conical sieve plate to vibrate through the semicircular blocks and protruding rods when the conical plate I rotates.

[0027] In this process, pulverized coal falls onto a conical screen plate and diffuses. The semi-circular block and the convex rod work together to vibrate the conical screen plate, screening out large-diameter pulverized coal and ensuring uniform pulverized coal particle size.

[0028] In one possible design, an oxygen detector is fixed to one side of both the grinding cylinder and the storage box. The detection probes of the two oxygen detectors are fixedly extended into the grinding cylinder and the storage box, respectively, for detecting the oxygen content. A nitrogen tube is fixedly inserted through the side of the grinding cylinder away from the oxygen detector for injecting nitrogen into the grinding cylinder to reduce the oxygen content. A pressure sensor is fixed to the top of the storage box, and the probe of the pressure sensor extends into the storage box for detecting the pressure inside the storage box.

[0029] Among them, the oxygen detector monitors the oxygen content in real time. When the content reaches the critical value, nitrogen is injected through the nitrogen tube to prevent spontaneous combustion or explosion. The pressure sensor monitors the pressure to ensure safe storage and transportation.

[0030] The method of using the blast furnace pulverized coal injection equipment in this application includes the following steps:

[0031] S1. Coal crushing: Coal is fed into the grinding drum, and the drive motor drives the rotating shaft and the crushing cone to rotate. At the same time, the piston rod and the arc-shaped protrusion push the hydraulic oil, so that the crushing cone moves up and down while rotating, thereby crushing the coal.

[0032] S2. Coal grinding: The crushed coal blocks fall onto the conical plate II, where they are initially ground by the grinding wheel I, and then further ground by the grinding wheel II to form fine coal powder.

[0033] S3. Screening and Safety Control: Coal powder falls onto a conical screen plate for vibration screening. At the same time, the oxygen concentration is monitored in real time by an oxygen detector. When the critical value is reached, nitrogen is automatically injected to prevent explosion.

[0034] S4. Conveying and Drying: Fan II blows pulverized coal into the storage box, and at the same time, the hot air in the insulation jacket is introduced into the drying pipeline to dry the pulverized coal in the storage box.

[0035] S5. Coal injection operation: Close the exhaust pipe to pressurize the storage tank, inject coal powder into the injection pipe, and blower I injects nitrogen to transport coal powder. The coal powder injection angle is controlled by adjusting the position of the bending plate to enhance the mixing effect.

[0036] S6. Waste gas utilization: Blast furnace waste gas is passed into the insulation jacket to preheat the pulverized coal in the injection pipe. At the same time, the waste gas is also used to dry the pulverized coal in the storage box.

[0037] Beneficial effects: In this invention, the exhaust gas in the blast furnace is injected into the insulation jacket through the inlet pipe. The heat in the exhaust gas preheats the pulverized coal in the injection pipe, reducing the heat required to heat the pulverized coal airflow to the ignition temperature and promoting the rapid ignition of high volatile bituminous coal. The easier the pulverized coal is to ignite, the more heat it generates, which further promotes combustion and improves the combustion rate of high volatile bituminous coal. The exhaust gas enters the outlet pipe through the through hole and is discharged from the insulation jacket.

[0038] In this invention, the rotating shaft drives the crushing cone to rotate, and when rotating, the piston rod and the arc-shaped protrusion cooperate to push the piston block to move, thereby injecting hydraulic oil into the hydraulic chamber through the conduit. The hydraulic oil pushes the crushing cone to move upward. Therefore, as the rotating shaft drives the crushing cone to rotate, the crushing cone moves up and down while rotating, thereby enabling the coal ore located between the crushing ring and the crushing cone to be quickly crushed into small-diameter coal blocks, which are convenient for subsequent grinding into powder.

[0039] In this invention, the rotating shaft drives the connecting plate to rotate, and the grinding wheel I can initially grind the coal block falling on the conical plate II to form coal powder. When the ground coal powder passes through the gap between the inner wall of the conical plate II and the fixed pipe, the grinding wheel II can perform secondary grinding on the coal powder, thereby grinding each piece into small-diameter coal powder, which is convenient for improving the combustion rate in the later stage.

[0040] In this invention, the hot air inside the insulation jacket is injected into the drying pipeline through the connecting pipe. Multiple air outlets at the bottom of the drying pipeline inject hot air into the storage box for drying the pulverized coal. The hot air inside the insulation jacket originates from the exhaust gas in the blast furnace and has an extremely low oxygen content. The low oxygen content of the exhaust gas can also inhibit the spontaneous combustion or explosion of the pulverized coal.

[0041] In this invention, preheating pulverized coal with waste gas reduces heating energy consumption, promotes rapid ignition of high-volatile bituminous coal, and improves combustion rate; the multi-stage grinding structure ensures uniform pulverized coal particle size, providing a foundation for efficient combustion; the spiral plate and bending plate in the injection assembly work together to enhance the mixing of pulverized coal and nitrogen and airflow disturbance, increasing the oxygen contact area and accelerating chemical reaction; the storage tank uses waste gas heat energy to dry pulverized coal, while the low oxygen content of the waste gas inhibits spontaneous combustion, and the oxygen detection and nitrogen injection devices ensure production safety; the heat energy recovery and utilization mechanism in the grinding and storage stages achieves efficient energy recycling. Attached Figure Description

[0042] Figure 1 A three-dimensional structural schematic diagram of the high volatile matter bituminous coal safe injection assembly provided by the present invention;

[0043] Figure 2 This is a three-dimensional cross-sectional view of the separation cylinder of the high volatile bituminous coal safety injection assembly provided by the present invention;

[0044] Figure 3 A cross-sectional view of the nozzle of the separator cylinder in the high volatile bituminous coal safety injection assembly provided by the present invention.

[0045] Figure 4 This is a three-dimensional structural schematic diagram of the blast furnace pulverized coal injection equipment provided by the present invention.

[0046] Figure 5 This is a three-dimensional cross-sectional view of the grinding cylinder of the blast furnace pulverized coal injection equipment provided by the present invention;

[0047] Figure 6 This is a three-dimensional cross-sectional view of the crushing cone platform of the blast furnace pulverized coal injection equipment provided by the present invention;

[0048] Figure 7 This is a three-dimensional cross-sectional structural schematic diagram of the hydraulic cylinder of the blast furnace pulverized coal injection equipment provided by the present invention;

[0049] Figure 8 A three-dimensional exploded structural diagram of the conical screen plate, protruding rod, and blower II of the blast furnace pulverized coal injection equipment provided by the present invention;

[0050] Figure 9 This is a three-dimensional exploded structural diagram of the fixed pipe and the rolling wheel II of the blast furnace pulverized coal injection equipment provided by the present invention;

[0051] Figure 10 This is a three-dimensional structural diagram of the rolling wheel I and the conical plate II of the blast furnace pulverized coal injection equipment provided by the present invention;

[0052] Figure 11 This is a three-dimensional structural diagram of the storage box and conveying pipe of the blast furnace pulverized coal injection equipment provided by the present invention;

[0053] Figure 12 This is a three-dimensional cross-sectional view of the storage box of the blast furnace pulverized coal injection equipment provided by the present invention.

[0054] In the diagram: 1. Spray pipe; 2. Injection pipe; 3. Solenoid valve I; 4. Spiral plate; 5. Fan I; 6. Spray nozzle; 7. Insulation sleeve; 8. Air inlet pipe; 9. Air outlet pipe; 10. Through hole; 11. Grinding cylinder; 12. Crushing ring; 13. Rotating shaft; 14. Drive motor; 15. Crushing cone platform; 16. Crushing protrusion; 17. Hydraulic chamber; 18. Hydraulic cylinder; 19. Guide tube; 20. Piston block; 21. Piston rod; 22. Tension spring; 23. Roller; 24. Arc-shaped protrusion; 25. Conical plate II; 26. Connection 27. Roller I; 28. Fixed pipe; 29. ​​Annular groove; 30. Roller II; 31. Conveying pipe; 32. Fan II; 33. Conical screen plate; 34. Protruding rod; 35. Storage box; 36. Exhaust pipe; 37. Cloth bag; 38. Connecting pipe; 39. Solenoid valve II; 40. Drying pipeline; 41. Pressure sensor; 42. Electric push rod; 43. Fixed rod; 44. Connecting rod; 45. Bending plate; 46. Crossbar; 47. Semicircular block; 48. Conical plate I; 49. Oxygen detector; 50. Nitrogen pipe. Detailed Implementation

[0055] 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.

[0056] In one embodiment: Refer to Figure 1 and Figure 2 The high-volatile bituminous coal safety injection assembly includes a spray pipe 1, an injection pipe 2, a blower I 5, a spray nozzle 6, and a preheating structure. The spray pipe 1 is made of high-temperature resistant and wear-resistant alloy steel. The injection pipe 2 is fixed to the top of the spray pipe 1 and is used to inject pulverized coal. A solenoid valve I 3 is installed on the outer wall of the injection pipe 2 to precisely control the amount of pulverized coal injected, ensuring the stability of the injection process. The blower I 5 is fixed to one end of the spray pipe 1 via a frame and is used to inject nitrogen into the spray pipe 1. The blower I 5 is a centrifugal blower. The outlet of the blower I 5 extends into the spray pipe 1 through a pipe, allowing the pulverized coal to be discharged to the other end of the spray pipe 1 along with the nitrogen flow. The injection of nitrogen not only provides power for conveying the pulverized coal but also reduces the oxygen content during the injection process, preventing pulverized coal explosions and improving production safety.

[0057] Reference Figure 1 and Figure 2 The nozzle 6 is fixed at the end of the injection pipe 1 away from the blower I5, and one end of it extends into the blast furnace to inject pulverized coal into the blast furnace for combustion. The nozzle 6 is made of wear-resistant ceramic material and has an internal flow channel structure that allows the pulverized coal to be injected evenly into the blast furnace.

[0058] Reference Figure 1 and Figure 2 The preheating structure is used to preheat the pulverized coal inside the injection pipe 1, reducing the energy required for the pulverized coal to reach its combustion point. The preheating structure mainly includes an insulation sleeve 7, an inlet pipe 8, an outlet pipe 9, a fixing ring, and a through hole 10. The insulation sleeve 7 is fixedly fitted onto the outer wall of the injection pipe 1 and is made of aluminum silicate fiber material with good heat insulation properties, effectively reducing heat loss. The inlet pipe 8 and outlet pipe 9 are fixedly connected to the top two sides of the insulation sleeve 7, respectively. The top end of the inlet pipe 8 is connected to the flue gas outlet of the blast furnace via a pipe, used to inject the blast furnace exhaust gas into the insulation sleeve 7 to preheat the pulverized coal. The fixing ring is fixed inside the insulation sleeve 7, located between the inlet pipe 8 and the outlet pipe 9, and is fixedly fitted onto the outer wall of the injection pipe 1. The fixing ring has a through hole 10, used to allow the exhaust gas to move below the outlet pipe 9, ensuring that the exhaust gas can flow fully within the insulation sleeve 7 and improving the preheating effect.

[0059] Reference Figure 2 A spiral plate 4 is fixed inside the spray pipe 1. The function of the spiral plate 4 is to make the coal powder and nitrogen rotate under the action of the spiral plate 4, thereby fully mixing the coal powder and nitrogen, improving the uniformity of coal powder conveying and combustion efficiency.

[0060] Reference Figures 4-12The blast furnace pulverized coal injection equipment includes the aforementioned high-volatile bituminous coal safety injection components, as well as a grinding cylinder 11, a storage tank 35, a crushing structure, a multi-stage grinding structure, and a drying structure. These structures are interconnected via pipes and connectors to form a complete pulverized coal injection system.

[0061] Reference Figures 5-7 The grinding cylinder 11 has a cylindrical structure and an internal crushing and multi-stage grinding structure. The crushing structure is used for preliminary crushing of coal ore and mainly includes a crushing ring 12, a crushing cone 15, a rotating shaft 13, and a drive motor 14. The crushing ring 12 is fixed to the inner wall of the grinding cylinder 11, and its bottom has multiple protrusions to enhance the crushing effect on the coal ore. The crushing cone 15 is located below the crushing ring 12, and its bottom has a hydraulic chamber 17. The rotating shaft 13 rotates on the bottom inner wall of the grinding cylinder 11. The bottom of the grinding cylinder 11 is fixed to the drive motor 14 by a frame, and the output shaft of the drive motor 14 extends into the grinding cylinder 11 and is fixedly connected to the bottom end of the rotating shaft 13. The top end of the rotating shaft 13 extends into the hydraulic chamber 17 and is slidably connected by a slide groove and a slider to drive the hydraulic chamber 17 to rotate. A piston plate is fixed to the top of the rotating shaft 13 and is slidably connected to the inner wall of the hydraulic chamber 17.

[0062] Reference Figures 5-7 Multiple hydraulic cylinders 18 are fixed to the bottom of the crushing cone 15. The number of hydraulic cylinders 18 is determined according to actual needs, generally 4-8. The tops of the multiple hydraulic cylinders 18 are fixedly connected to the hydraulic chamber 17 through conduits 19. A piston block 20 is slidably connected inside the hydraulic cylinder 18. A piston rod 21 is fixed to the end of the piston block 20 away from the rotating shaft 13, and one end of the piston rod 21 slides to one side of the hydraulic cylinder 18. A tension spring 22 is fixed between one side of the piston block 20 and one side of the inner wall of the hydraulic cylinder 18 through a spring seat, which is used to reset the piston rod 21 after it moves. A roller 23 is rotatably connected to the end of the piston rod 21 away from the piston block 20. Multiple arc-shaped protrusions 24 are fixed to the inner wall of the grinding cylinder 11, and the arc-shaped protrusions 24 cooperate with the roller 23 to drive the piston rod 21 to move and inject the hydraulic oil in the hydraulic cylinder 18 into the hydraulic chamber 17. Multiple crushing protrusions 16 are fixed to the top of the crushing cone platform 15 for crushing coal as the crushing cone platform 15 moves and rotates.

[0063] The drive motor 14 drives the rotating shaft 13 to rotate. The rotating shaft 13 and the hydraulic chamber 17 slide together via a groove and a slider, causing the crushing cone 15 to rotate. Simultaneously, the piston rod 21, in conjunction with the arc-shaped protrusion 24, pushes the piston block 20 to move, thereby injecting hydraulic oil into the hydraulic chamber 17 through the conduit 19. The hydraulic oil then pushes the crushing cone 15 upwards. Therefore, as the rotating shaft 13 drives the crushing cone 15 to rotate, the crushing cone 15 moves up and down while rotating, enabling rapid crushing of the coal ore located between the crushing ring 12 and the crushing cone 15, forming small-diameter coal blocks for subsequent grinding into powder.

[0064] Reference Figure 5 , Figure 9 and Figure 10 The multi-stage grinding structure is used to grind pulverized coal multiple times to achieve a specified particle size. The multi-stage grinding structure mainly includes a conical plate II 25, connecting plates 26, a grinding wheel I 27, a fixed pipe 28, an annular groove 29, and a grinding wheel II 30. The conical plate II 25 is fixed to the inner wall of the grinding cylinder 11 and located below the crushing conical platform 15. It is concave and has a central hole. Multiple connecting plates 26 are fixed to the outer wall of the rotating shaft 13, located above the conical plate II 25. The number of connecting plates 26 is determined according to actual grinding requirements, generally 13-16. The bottom of each connecting plate 26 is rotatably connected to the grinding wheel I 27. When the rotating shaft 13 drives the grinding wheel I 27 to revolve, the grinding wheel I 27 grinds the crushed coal on the conical plate II 25.

[0065] Reference Figures 8-10 A fixing tube 28 is fixed to the outer wall of the rotating shaft 13, and the fixing tube 28 is located inside the circular hole. The outer wall of the fixing tube 28 has an annular groove 29, within which multiple grinding wheels II 30 are rotatably mounted. The number of grinding wheels II 30 is generally 24-32, and the grinding wheels II 30 contact the inner wall of the circular hole. When the rotating shaft 13 drives the fixing tube 28 to rotate, the grinding wheels II 30 perform secondary grinding on the coal powder passing through the circular hole.

[0066] The crushed coal falls onto conical plate II 25 and moves towards the center due to the indentation at the center of conical plate II 25. Rotating shaft 13 drives connecting plate 26 to rotate, and grinding wheel I 27 rotates on conical plate II 25, initially grinding the coal lumps onto conical plate II 25 into coal powder. When the ground coal powder passes through the gap between the inner wall of conical plate II 25 and fixed pipe 28, grinding wheel II 30 performs secondary grinding, thus grinding the coal lumps into small-diameter coal powder, which facilitates improved combustion rate in later stages.

[0067] Reference Figure 5 and Figure 8A conical plate I 48 is fixed to the bottom of the fixed pipe 28 to distribute the ground coal powder in all directions. Multiple semi-circular blocks 47 are fixed to the bottom of the conical plate I 48, typically 4-8 in number. A conical screen plate 33 is fixed inside the grinding cylinder 11, located below the conical plate I 48, for screening the coal powder. Multiple protruding rods 34 are fixed to the top of the conical screen plate 33, the number of which corresponds to the number of semi-circular blocks 47, and the protruding rods 34 cooperate with the semi-circular blocks 47.

[0068] When the conical plate I 48 rotates, the semicircular block 47 cooperates with the protruding rod 34 to drive the conical screen plate 33 to vibrate. Coal powder falls onto the conical screen plate 33 and spreads outwards along the inclined outer wall of the conical screen plate 33. Through the vibration of the conical screen plate 33, large-diameter coal powder is screened to ensure that the coal powder particle size is uniform during the subsequent coal injection process.

[0069] Reference Figure 4 , Figure 11 and Figure 12 The drying structure is used to transport the pulverized coal ground in the grinding cylinder 11 to the storage tank 35 for drying and storage. The drying structure mainly includes a drying pipeline network 40, a connecting pipe 38, a blower II 32, a conveying pipe 31, an exhaust pipe 36, a filter bag 37, and a solenoid valve II 39. The drying pipeline network 40 is installed inside the storage tank 35. The drying pipeline network 40 is fixed inside the storage tank 35 near the bottom, and has multiple air outlets at the bottom for injecting hot air into the storage tank 35 to dry the pulverized coal. The connecting pipe 38 is fixedly connected to the storage tank 35, with one end fixedly connected to the drying pipeline network 40 and the other end fixedly connected to the exhaust pipe 9, for reusing the waste gas in the exhaust pipe 9. The top end of the injection pipe 2 is fixed to the bottom of the storage tank 35 and connected to the storage tank 35, for injecting the pulverized coal in the storage tank 35 into the injection pipe 1. The bottom of the grinding cylinder 11 is fixedly connected to the conveying pipe 31, and one end of the conveying pipe 31 is fixedly connected to the top inner wall of the storage tank 35. A blower II 32 is fixed to the bottom of the grinding cylinder 11 via a frame. The blower II 32 is a Roots blower with an air volume ranging from 500 to 2000 m³ / h and an air pressure ranging from 3000 to 8000 Pa. The air outlet of the blower II 32 extends into the conveying pipe 31 via a fixed pipe for injecting air into the conveying pipe 31, so that the pulverized coal is injected into the storage box 35 for storage along with the air.

[0070] Reference Figure 12 An exhaust pipe 36 is fixedly installed through the top of the storage tank 35 to discharge the gas inside the storage tank 35. A filter bag 37, made of polyester fiber material, is fixed to the bottom of the exhaust pipe 36 to filter the coal dust in the discharged gas. Both the connecting pipe 38 and the exhaust pipe 36 are equipped with solenoid valves II 39, which are electric butterfly valves matched with the pipes to precisely control the gas flow.

[0071] Blower II 32 blows air into the conveying pipe 31, and the ground coal powder in the grinding cylinder 11 is propelled by the air into the storage box 35 for storage. Excess air in the storage box 35 is discharged to the outside through the exhaust pipe 36, with a filter bag 37 filtering the discharged air to prevent coal powder from spilling out. To ensure the dryness of the coal powder stored in the storage box 35 for later use, the solenoid valve II 39 on the connecting pipe 38 is opened, and the hot air in the exhaust pipe 9 is injected into the drying pipe network 40 through the connecting pipe 38. Multiple exhaust holes at the bottom of the drying pipe network 40 inject hot air into the storage box 35 for drying the coal powder. The hot air in the exhaust pipe 9 originates from the exhaust gas in the blast furnace, and the main components of the exhaust gas are nitrogen (60%-66%), carbon dioxide (23%-30%), and water vapor (6%-8%), with extremely low oxygen content. The low oxygen content of the exhaust gas can also inhibit the spontaneous combustion or explosion of the coal powder.

[0072] Reference Figure 4 , Figure 5 and Figure 11 An oxygen detector 49 is fixed to one side of both the grinding cylinder 11 and the storage tank 35. The detection probes of the two oxygen detectors 49 extend into the grinding cylinder 11 and the storage tank 35 respectively to detect the oxygen content within them. The oxygen detectors 49 are electrochemical oxygen detectors, with a detection accuracy of 0.1% and a range of 0-25%. A nitrogen pipe 50 is fixedly installed on the side of the grinding cylinder 11 away from the oxygen detectors 49 to inject nitrogen into the grinding cylinder 11 and reduce the oxygen content. When the oxygen detectors 49 detect that the oxygen content inside the grinding cylinder 11 reaches a critical value (≥12%), nitrogen is injected into the grinding cylinder 11 through the nitrogen pipe 50 to reduce the oxygen content, prevent spontaneous combustion or explosion of coal powder inside the grinding cylinder 11, and ensure production safety.

[0073] Reference Figure 11 A pressure sensor 41 is fixed to the top of the storage tank 35, and the probe of the pressure sensor 41 extends into the storage tank 35 to detect the pressure inside the storage tank 35. The pressure sensor 41 is a piezoresistive pressure sensor, with a measurement range between 0-0.2 MPa and an accuracy of 0.1%. When the solenoid valve II 39 on the exhaust pipe 36 is closed, the hot air in the insulation jacket 7 is continuously injected into the storage tank 35, increasing the pressure inside the storage tank 35, which facilitates the injection of pulverized coal into the spray pipe 1 through the injection pipe 2.

[0074] In another embodiment: Refer to Figure 3An electric push rod 42 is fixed to the top of the spray nozzle 1. The electric push rod 42 is a linear electric push rod. A fixing rod 43 is fixed to the output shaft of the electric push rod 42. One end of the fixing rod 43 extends into the blast furnace in a sealed sliding manner. A connecting rod 44 is fixed to the bottom of the fixing rod 43 via a vertical rod. A horizontal rod 46 is fixedly inserted through the connecting rod 44 and slides inside the spray nozzle 6. A bending plate 45 is fixed to one end of the connecting rod 44. The end of the bending plate 45 near the spray nozzle 6 has two arc surfaces.

[0075] The output shaft of the electric push rod 42 drives the bending plate 45 to move via the connecting rod 44, controlling the distance between the bending plate 45 and the injection nozzle 6. Under the action of the curved surface of the bending plate 45, the angle at which pulverized coal enters the blast furnace can be controlled, thereby guiding the injection medium, strengthening the disturbance to improve the mixing of airflow and pulverized coal, ensuring that oxygen or air is fully and strongly mixed with pulverized coal, increasing the contact area between pulverized coal and oxygen, and improving their chemical reaction rate.

[0076] The operating method of blast furnace pulverized coal injection equipment includes the following steps:

[0077] S1. Coal ore is put into the grinding cylinder 11. The drive motor 14 drives the rotating shaft 13 to rotate. The rotating shaft 13 and the hydraulic chamber 17 are slidably engaged through the slide groove and the slider, which drives the crushing cone 15 to rotate. When the crushing cone 15 rotates, the piston rod 21 and the arc-shaped protrusion 24 cooperate to push the piston block 20 to move. Then, hydraulic oil is injected into the hydraulic chamber 17 through the conduit 19. The hydraulic oil pushes the crushing cone 15 to move upward. Therefore, as the rotating shaft 13 drives the crushing cone 15 to rotate, the crushing cone 15 moves up and down while rotating. This allows the coal ore located between the crushing ring 12 and the crushing cone 15 to be quickly crushed into small-diameter coal blocks, which are convenient for subsequent grinding into powder.

[0078] S2. The crushed coal falls onto the conical plate II 25 and moves towards the center under the action of the indentation in the center of the conical plate II 25. The rotating shaft 13 drives the connecting plate 26 to rotate, and the grinding wheel I 27 rotates on the conical plate II 25. Therefore, the grinding wheel I 27 can initially grind the coal pieces falling on the conical plate II 25 into coal powder. When the ground coal powder passes through the gap between the inner wall of the conical plate II 25 and the fixed pipe 28, the grinding wheel II 30 can perform secondary grinding on the coal powder, so that each piece can be ground into small-diameter coal powder, which is convenient for improving the combustion rate in the later stage.

[0079] S3. Coal powder falls onto the conical screen plate 33 and spreads outwards along the inclined outer wall of the conical screen plate 33. In addition, the rotating shaft 13 drives the semi-circular block 47 to rotate through the conical plate I 48. The cooperation between the semi-circular block 47 and the protruding rod 34 can continuously strike the conical screen plate 33 to vibrate, thereby screening large-diameter coal powder through the conical screen plate 33 to ensure that the coal powder particle size is uniform during the later coal injection process. During the coal crushing and grinding process, the oxygen detector 49 detects the oxygen content inside the grinding cylinder 11 in real time. When the detected oxygen content reaches the critical value (≥12%), nitrogen is injected into the grinding cylinder 11 through the nitrogen pipe 50 to reduce the oxygen content and prevent the coal powder from spontaneously combusting or exploding inside the grinding cylinder 11, thus ensuring the safety of production.

[0080] S4. Start the blower II 32. The blower II 32 blows air into the conveying pipe 31. The pulverized coal in the grinding cylinder 11 is pushed into the storage box 35 by the air for storage. The excess air in the storage box 35 is discharged to the outside through the exhaust pipe 36. The filter bag 37 filters the air discharged to the outside to prevent the pulverized coal from spilling out. In order to ensure the dryness of the pulverized coal stored in the storage box 35 and facilitate its later use, open the solenoid valve II 39 on the connecting pipe 38. The hot air in the insulation jacket 7 is injected into the drying pipe network 40 through the connecting pipe 38. The multiple air outlets at the bottom of the drying pipe network 40 inject hot air into the storage box 35 for drying the pulverized coal. The hot air in the insulation jacket 7 comes from the exhaust gas in the blast furnace. The main components of the exhaust gas are nitrogen (60%-66%), carbon dioxide (23%-30%), and water vapor (6%-8%). The oxygen content is extremely low. The low oxygen content of the exhaust gas can also inhibit the spontaneous combustion or explosion of the pulverized coal.

[0081] S5. When it is necessary to inject pulverized coal into the blast furnace, close the solenoid valve II 39 on the exhaust pipe 36. The hot gas in the insulation jacket 7 is continuously injected into the storage box 35, increasing the pressure in the storage box 35, which facilitates the injection of pulverized coal into the injection pipe 1 through the injection pipe 2. Then, the blower I 5 injects nitrogen gas from the outside into the injection pipe 1. The nitrogen gas flow carries the pulverized coal into the blast furnace. When passing through the spiral plate 4, the pulverized coal and nitrogen gas are fully mixed. Under the action of nitrogen gas, the pulverized coal is injected into the blast furnace through the injection nozzle 6. In addition, the output shaft of the electric push rod 42 drives the bending plate 45 to move through the connecting rod 44, controlling the bending. The distance between plate 45 and nozzle 6, and the arc of the bent plate 45, can control the angle at which pulverized coal enters the blast furnace, thus guiding the injection medium, that is, intervening in the flow direction of each injection medium, thereby strengthening the disturbance to improve the mixing of airflow and pulverized coal, ensuring that oxygen or air is fully and strongly mixed with pulverized coal, increasing the contact area between pulverized coal and oxygen, improving its chemical reaction rate, thereby promoting the mass transfer process of the reaction, promoting the collision between particles after diffusion, and further promoting the convective heat transfer between the blast airflow and the pulverized coal flow, thus achieving the purpose of improving the combustion rate and utilization rate of high volatile bituminous coal;

[0082] S6. The exhaust gas in the blast furnace is injected into the insulation jacket 7 through the inlet pipe 8. The heat in the exhaust gas preheats the pulverized coal in the injection pipe 1, reducing the heat required to heat the pulverized coal airflow to the ignition temperature and promoting the rapid ignition of high volatile bituminous coal. The easier the pulverized coal is to ignite, the more heat it generates, which further promotes combustion and improves the combustion rate of high volatile bituminous coal. The exhaust gas enters the outlet pipe 9 through the through hole 10 and is discharged from the insulation jacket 7. In addition, the exhaust gas can also be injected into the storage box 35 to dry the stored pulverized coal.

[0083] However, as is well known to those skilled in the art, the working principles and wiring methods of solenoid valve I3, solenoid valve II39, fan II32, fan I5, oxygen detector 49, drive motor 14 and pressure sensor 41 are all conventional methods or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0084] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0085] 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 safe injection assembly for high volatile bituminous coal, characterized in that, include: The top of the spray pipe (1) is fixed with a feeding pipe (2) for injecting pulverized coal. The outer wall of the feeding pipe (2) is provided with a solenoid valve I (3). One end of the spray pipe (1) is fixed with a fan I (5) for injecting nitrogen into the spray pipe (1) through a bracket. The outlet end of the fan I (5) is fixed to the spray pipe (1) through a pipe for discharging pulverized coal with the nitrogen flow to the other end of the spray pipe (1). The end of the spray pipe (1) away from the fan I (5) is fixed with a nozzle (6), and one end of the nozzle (6) is fixed to the blast furnace for injecting pulverized coal into the blast furnace for combustion. The preheating structure is used to preheat the pulverized coal in the injection pipe (1) to reduce the energy required for the pulverized coal to reach the combustion point. The preheating structure includes a heat insulation sleeve (7) fixedly sleeved on the outer wall of the injection pipe (1). The top two sides of the heat insulation sleeve (7) are respectively fixedly connected to an air inlet pipe (8) and an air outlet pipe (9). The top end of the air inlet pipe (8) is connected to the smoke outlet of the blast furnace through a pipe to inject the exhaust gas of the blast furnace into the heat insulation sleeve (7) to preheat the pulverized coal.

2. The high volatile bituminous coal safe injection assembly of claim 1, wherein, The preheating structure also includes a fixing ring, which is located inside the insulation sleeve (7) and fixedly sleeved on the outer wall of the spray pipe (1), and located between the air inlet pipe (8) and the air outlet pipe (9). The fixing ring is provided with a through hole (10) for allowing the exhaust gas to move through the through hole (10) to the bottom of the air outlet pipe (9). A spiral plate (4) is fixed inside the spray pipe (1) for causing the coal powder and nitrogen to rotate and mix under the action of the spiral plate (4).

3. The high volatile bituminous coal safe injection assembly of claim 2, wherein, An electric push rod (42) is fixed to the top of the spray pipe (1). A fixed rod (43) is fixed to the output shaft of the electric push rod (42). One end of the fixed rod (43) extends into the blast furnace in a sealed sliding manner. A connecting rod (44) is fixed to the bottom of the fixed rod (43) through a vertical rod. A horizontal rod (46) is fixed through the connecting rod (44), and the horizontal rod (46) is slidably connected to the spray nozzle (6). A bending plate (45) is fixed to one end of the connecting rod (44). The bending plate (45) has two arc surfaces at the end near the spray nozzle (6).

4. A coal injection equipment for blast furnace comprising the safe injection assembly of bituminous coal with high volatile matter as claimed in claim 3, wherein, It also includes a grinding cylinder (11) and a storage box (35). The grinding cylinder (11) is provided with a crushing structure for crushing coal blocks. The crushing structure includes a crushing ring (12) fixed to the inner wall of the grinding cylinder (11) and a crushing cone platform (15) disposed below the crushing ring (12). A multi-stage grinding structure is used to grind pulverized coal blocks to a specified particle size multiple times. The multi-stage grinding structure includes multiple grinding wheels I (27) and grinding wheels II (30). The drying structure is used to transport the ground coal powder in the grinding cylinder (11) to the storage box (35) for drying and storage.

5. The blast furnace pulverized coal injection equipment according to claim 4, characterized in that, The crushing structure also includes a rotating shaft (13) rotatably connected to the inner wall of the bottom of the grinding cylinder (11). A drive motor (14) is fixed to the bottom of the grinding cylinder (11) by a bracket. The output shaft of the drive motor (14) extends rotatably into the grinding cylinder (11) and is fixedly connected to the bottom end of the rotating shaft (13). The bottom of the crushing cone (15) is provided with a hydraulic chamber (17). The top end of the rotating shaft (13) extends into the hydraulic chamber (17) and is slidably connected by a slide groove and a slider to drive the rotating shaft (13) to rotate the hydraulic chamber (17). A piston plate is fixed to the top of the rotating shaft (13) and is slidably connected to the inner wall of the hydraulic chamber (17). Multiple hydraulic cylinders (18) are fixed to the bottom of the crushing cone (15). The tops of the multiple hydraulic cylinders (18) are fixedly connected to the hydraulic chamber (17) by a conduit (19). A piston block (20) is slidably connected inside the cylinder (18). A piston rod (21) is fixed at one end of the piston block (20) away from the rotating shaft (13). One end of the piston rod (21) extends slidably to one side of the hydraulic cylinder (18). A tension spring (22) is fixed between one side of the piston block (20) and one side of the inner wall of the hydraulic cylinder (18) through a spring seat. A roller (23) is rotatably connected at one end of the piston rod (21) away from the piston block (20). Multiple arc-shaped protrusions (24) are fixed on the inner wall of the grinding cylinder (11). The arc-shaped protrusions (24) cooperate with the roller (23) to drive the piston rod (21) to move and inject the hydraulic oil in the hydraulic cylinder (18) into the hydraulic chamber (17). Multiple crushing protrusions (16) are fixed on the top of the crushing cone (15) to crush the coal block when the crushing cone (15) moves and rotates.

6. The blast furnace pulverized coal injection equipment according to claim 5, characterized in that, The multi-stage grinding structure also includes a conical plate II (25) fixed to the inner wall of the grinding cylinder (11) and located below the crushing conical platform (15). The conical plate II (25) is concave and has a circular hole in its center. Multiple connecting plates (26) located above the conical plate II (25) are fixed to the outer wall of the rotating shaft (13). The bottom of each of the multiple connecting plates (26) is rotatably connected to a grinding wheel I (27) for use when the rotating shaft (13) drives the grinding wheel I (27) to revolve. The broken coal blocks on the conical plate II (25) are ground. The outer wall of the rotating shaft (13) is fixed with a fixed tube (28), and the fixed tube (28) is located in the round hole. The outer wall of the fixed tube (28) is provided with an annular groove (29). Multiple grinding wheels II (30) are rotatably arranged in the annular groove (29), and the grinding wheels II (30) are in contact with the inner wall of the round hole. They are used to perform secondary grinding of the coal powder passing through the round hole by the grinding wheels II (30) when the rotating shaft (13) drives the fixed tube (28) to rotate.

7. The blast furnace pulverized coal injection equipment according to claim 6, characterized in that, The drying structure includes a drying pipe network (40) fixed inside the storage tank (35) near the bottom. The bottom of the drying pipe network (40) has multiple air outlets for injecting hot air into the storage tank (35) to dry the coal powder. A connecting pipe (38) is fixedly inserted through the storage tank (35). One end of the connecting pipe (38) is fixedly connected to the drying pipe network (40), and the other end is fixedly connected to the air outlet pipe (9) for reusing the waste gas in the air outlet pipe (9). The top end of the injection pipe (2) is fixed to the bottom of the storage tank (35) and connected to the storage tank (35) for injecting the coal powder from the storage tank (35) into the spray pipe (1). The bottom of the grinding cylinder (11)... A conveying pipe (31) is fixedly connected to the storage tank (35). One end of the conveying pipe (31) is fixedly inserted through the top inner wall of the storage tank (35). A fan II (32) is fixedly attached to the bottom of the grinding cylinder (11) by a bracket. The air outlet of the fan II (32) is fixedly extended into the conveying pipe (31) through a pipe for injecting air into the conveying pipe (31) so that the coal powder is injected into the storage tank (35) along with the air. An exhaust pipe (36) is fixedly inserted through the top of the storage tank (35) for discharging the gas in the storage tank (35). A cloth bag (37) is fixedly attached to the bottom of the exhaust pipe (36) for filtering the coal powder in the discharged gas. Solenoid valves II (39) are provided on both the connecting pipe (38) and the exhaust pipe (36).

8. The blast furnace pulverized coal injection equipment according to claim 7, characterized in that, The bottom of the fixed tube (28) is fixed with a conical plate I (48) for dispersing the ground coal powder in all directions. The bottom of the conical plate I (48) is fixed with a plurality of semi-circular blocks (47). The grinding cylinder (11) is fixed with a conical sieve plate (33) located below the conical plate I (48) for screening the coal powder. The top of the conical sieve plate (33) is fixed with a plurality of protruding rods (34), and the protruding rods (34) cooperate with the semi-circular blocks (47) to drive the conical sieve plate (33) to vibrate through the semi-circular blocks (47) and the protruding rods (34) when the conical plate I (48) rotates.

9. The blast furnace pulverized coal injection equipment according to claim 8, characterized in that, An oxygen detector (49) is fixed on one side of both the grinding cylinder (11) and the storage box (35). The detection probes of the two oxygen detectors (49) are fixedly extended into the grinding cylinder (11) and the storage box (35) respectively to detect the oxygen content. A nitrogen tube (50) is fixedly inserted through the side of the grinding cylinder (11) away from the oxygen detector (49) to inject nitrogen into the grinding cylinder (11) to reduce the oxygen content. A pressure sensor (41) is fixed on the top of the storage box (35), and the probe of the pressure sensor (41) extends into the storage box (35) to detect the pressure inside the storage box (35).

10. A method of using a blast furnace pulverized coal injection device, applied to the blast furnace pulverized coal injection device as described in claim 9, characterized in that, Includes the following steps: S1. The coal ore is put into the grinding cylinder (11), the drive motor (14) drives the rotating shaft (13) and the crushing cone (15) to rotate, and at the same time, the piston rod (21) and the arc-shaped protrusion (24) work together to push the hydraulic oil to make the crushing cone (15) move up and down to crush the coal ore; S2. After being crushed, the coal blocks fall onto the conical plate II (25), where they are initially ground by the rolling roller I (27) and then further ground by the rolling roller II (30) to form coal powder. S3. Coal powder is screened by vibration through a conical screen plate (33), and the oxygen concentration is monitored by an oxygen detector (49). If the concentration exceeds the standard, nitrogen is injected to prevent explosion. S4, Fan II (32) blows coal powder into storage box (35), and hot air in insulation jacket (7) dries coal powder through drying pipeline (40); S5. Close the exhaust pipe (36) to pressurize the storage box (35) for coal injection, and blower I (5) injects nitrogen to transport coal powder. The injection angle is adjusted by the bending plate (45) to enhance mixing. S6. Blast furnace exhaust gas is introduced into the insulation jacket (7) to preheat pulverized coal, and the exhaust gas is used for pulverized coal drying at the same time.

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