Pressure relief device suitable for pulverized coal bunker
By designing a pressure relief device suitable for pulverized coal silos, the problem of uncontrollable air pressure was solved, achieving stable air pressure regulation and equipment safety, thus ensuring the safe and stable operation of the pulverized coal silos.
Patent Information
- Application Number
- CN202520472114.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-03-18
AI Technical Summary
The existing pulverized coal silos lack effective pressure relief devices, resulting in inflexible control of air pressure, which may lead to slight pressure or pressure rise, affecting safety and equipment stability.
A pressure relief device is designed, comprising a solenoid valve, a vacuum pump, a filter screen, a backflushing section, and a brush section. The vacuum pump draws in gas, which is then filtered by the filter screen. The backflushing section cleans the filter screen, and the brush section removes impurities, ensuring that the gas pressure remains within a reasonable range.
It enables effective regulation of the air pressure in the pulverized coal silo, maintains a reasonable negative pressure, prevents pulverized coal leakage and equipment hazards, and ensures safe and continuous operation.
Smart Images
Figure CN223779090U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pressure relief device, and more particularly to a device that can relieve pressure in a pulverized coal silo to maintain its air pressure within a reasonable range, belonging to the technical field of pulverized coal silo pressure relief equipment. Background Technology
[0002] The pulverized coal silo in a blast furnace pulverized coal injection system is a crucial component for storing pulverized coal. The storage of pulverized coal is particularly important in this system, as it buffers the amount of pulverized coal used, reduces equipment hazards caused by frequent mill start-ups and shutdowns, and also provides insulation and air isolation. The pulverized coal silo is typically under negative pressure to prevent pulverized coal from overflowing and to prevent air from entering, ensuring safety. However, existing pulverized coal silos have the following problems: 1. The pulverized coal silo lacks a pressure relief device. When the injection tank automatically balances the pressure, the pressure is released to the pulverized coal collector. When the collector unloads pulverized coal, some nitrogen gas is carried along with the coal and enters the pulverized coal silo. 1. To create a slightly pressurized state in the pulverized coal silo; 2. When pulverized coal is loaded into the injection tank, a slightly pressurized environment enters the injection tank, thereby reducing the pressure in the pulverized coal silo; 3. When the system is under maintenance, in order to ensure the normal use of pulverized coal in the blast furnace, pulverized coal needs to be transported from the standby system to the pulverized coal silo of this system. During the transport of pulverized coal, nitrogen is transported along with the pulverized coal into the pulverized coal silo using pneumatic conveying, and the loading is not continuous, causing the pressure in the pulverized coal silo to rise continuously. This makes it impossible to flexibly and effectively control the air pressure in the pulverized coal silo; therefore, a pressure relief device is needed, which is required to effectively relieve the pressure when the air pressure in the pulverized coal silo is high. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pressure relief device suitable for pulverized coal silos, which can effectively regulate the air pressure inside the pulverized coal silos and ensure that the pulverized coal silos are maintained within a reasonable negative pressure range.
[0004] The problem described in this utility model is solved by the following technical solution:
[0005] A pressure relief device for a pulverized coal silo includes a solenoid valve, a cylinder, a vacuum pump, a filter screen, a backflushing section, and a brush section. An interface is provided at the top of the side wall of the pulverized coal silo, and the first interface of the solenoid valve is located at the interface at the top of the pulverized coal silo. The bottom end of the cylinder is connected to the second interface of the solenoid valve. A sealing cover is provided at the top of the cylinder, with a hole in its center, and the vacuum pump is connected to the center hole of the sealing cover via a pipe. The filter screen is located on the inner wall of the cylinder. The backflushing section is located on the side wall of the cylinder, directly above the filter screen. The brush section is located at the center of the bottom end face of the filter screen. The signal input terminals of the solenoid valve and the vacuum pump are connected to the signal output terminal of a CPU. A pressure sensor is provided on the inner wall of the pulverized coal silo, and its signal output terminal is connected to the signal input terminal of the CPU.
[0006] The aforementioned pressure relief device for a pulverized coal silo includes a backflushing section comprising a long outer cover, an electric cylinder, a first sealing plate, a second sealing plate, a long plate, and a backflushing mechanism. The long outer cover is mounted on the outer wall of a cylinder, with its end in contact with the cylinder open. A square hole is provided on the side wall of the cylinder, with the bottom surface of the square hole flush with the top surface of the filter screen. The opening at the end of the long outer cover aligns with the square hole in the cylinder. The first and second sealing plates have identical structures and perfectly match the outline of the square hole on the side wall of the cylinder. Each sealing plate has a sealing ring on its outer wall; the long plate is positioned between the first and second sealing plates, with its two ends located at the bottom of the sidewalls of the first and second sealing plates, respectively; the housing of the electric cylinder is located at the end of the outer wall of the long outer cover away from the cylinder, and its piston rod passes through the sidewall of the long outer cover and connects to the sidewall of the first sealing plate; the signal input terminal of the electric cylinder is connected to the signal output terminal of the CPU; the combination of the first sealing plate, the second sealing plate, and the long plate passes through the square hole in the cylinder; the recoil mechanism is located on the top surface of the long plate.
[0007] The aforementioned pressure relief device for a pulverized coal silo includes a backflushing mechanism comprising a hollow cylinder, a first hollow rod, a second hollow rod, and a rotary joint. The bottom end of the hollow cylinder is axially connected to the center of the top surface of a long plate. The ends of the first and second hollow rods are symmetrically arranged on both sides of the circumferential sidewall of the hollow cylinder. The inner cavities of both the first and second hollow rods communicate with the inner cavity of the hollow cylinder. Multiple bottom nozzles are abutted to the bottom surfaces of both the first and second hollow rods. The long side of the first hollow rod is perpendicular to the sidewall of the first hollow rod. A side nozzle is provided at one end of the hollow cylinder, and the side nozzle communicates with the inner cavity of the first hollow rod; the rotary joint is mounted on the first sealing plate by a bracket, and the bottom end of the rotary joint is connected to the top interface of the hollow cylinder; the top end of the rotary joint is connected to the rigid connecting pipe, and the other end of the rigid connecting pipe passes through the first sealing plate; an air pump is provided outside the cylinder, and a flexible hose is provided at the air outlet of the air pump, and the flexible hose passes through the long strip cover and is connected to the end of the rigid connecting pipe inside the long strip cover; the signal input terminal of the air pump is connected to the signal output terminal of the CPU.
[0008] The aforementioned pressure relief device for pulverized coal silos has a magnetic induction switch embedded on the end face of the first sealing plate near the hollow cylinder, and a magnet embedded on the end face of the second sealing plate near the hollow cylinder; magnets are provided at the ends of the first and second hollow rods away from the hollow cylinder; the signal output terminal of the magnetic induction switch is connected to the signal input terminal of the CPU.
[0009] The aforementioned pressure relief device for pulverized coal silos includes a brush section comprising a rotary motor, a U-shaped frame, and thin rods. The rotary motor is positioned at the center of the bottom surface of the filter screen, and the end of its piston rod is connected to the center of the U-shaped frame. Thin rods are provided at both ends of the U-shaped frame, and brushes are provided on the top surfaces of the thin rods, with the brushes contacting the bottom surface of the filter screen. The signal input terminal of the rotary motor is connected to the signal output terminal of the CPU.
[0010] This invention effectively extracts gas from the pulverized coal silo using an air pump, thus controlling the pressure relief of the silo. A filter screen is used to filter the gas extracted by the air pump, preventing pulverized coal from being carried out. The backflushing and brushing components work together to clean the filter screen, preventing clogging and ensuring proper pressure relief. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the three-dimensional structure of the inner cylindrical part of this utility model from a downward angle.
[0012] Figure 2 This is a partially enlarged structural diagram of component A of this utility model;
[0013] Figure 3 This is a schematic diagram of the three-dimensional structure of the internal elevation angle of the cylinder of this utility model.
[0014] The list of labels in the diagram is as follows: 1. Solenoid valve, 2. Cylinder, 3. Filter screen, 4. Long strip cover, 5. Electric cylinder, 6. First sealing plate, 7. Second sealing plate, 8. Long plate, 9. Hollow cylinder, 10. First hollow rod, 11. Second hollow rod, 12. Rotary joint, 13. Rotary motor, 14. U-shaped frame, 15. Thin rod. Detailed Implementation
[0015] See Figure 1 , 2 and Figure 3This utility model includes a solenoid valve 1, a cylinder 2, a vacuum pump, a filter screen 3, a backflushing part, and a brush part; an interface is provided at the top of the side wall of the coal powder silo, and the first interface of the solenoid valve 1 is located at the interface at the top of the coal powder silo; the solenoid valve 1 is used to control the opening and closing of the gas outflow from the coal powder silo; the bottom end of the cylinder 2 is connected to the second interface of the solenoid valve 1; a sealing cover is provided at the top of the cylinder 2, and a hole is provided in the center of the sealing cover, and the vacuum pump is connected to the center hole of the sealing cover through a pipe; the airflow in the coal powder silo passes through the solenoid valve 1 and the cylinder 2 in sequence and is then discharged from the coal powder silo by the vacuum pump; the filter screen 3 is located on the inner wall of the cylinder 2; the discharged airflow carries coal powder with it, and the filter screen 3 blocks the coal powder to prevent it from being discharged, ensuring that only gas is discharged; The backflushing section is located on the side wall of the cylinder 2, directly above the filter screen 3. The backflushing section releases a high-pressure airflow downwards from directly above the filter screen 3, which washes away the coal dust adsorbed at its bottom. The sweeping brush section is located at the center of the bottom surface of the filter screen 3. The sweeping brush section is used to clean impurities that are difficult to remove from the bottom surface of the filter screen 3, ensuring thorough cleaning. The signal input terminals of the solenoid valve 1 and the air pump are connected to the signal output terminal of the CPU. A pressure sensor is installed on the inner wall of the coal dust hopper, and its signal output terminal is connected to the signal input terminal of the CPU. The pressure sensor can sense the pressure inside the coal dust hopper in real time, and thus adapt the device to changes in pressure within the hopper.
[0016] The backflush section includes a long outer cover 4, an electric cylinder 5, a first sealing plate 6, a second sealing plate 7, a long plate 8, and a backflush mechanism. The long outer cover 4 is disposed on the outer wall of the cylinder 2, and its end in contact with the cylinder 2 is open. A square hole is provided on the side wall of the cylinder 2, and the bottom end face of the square hole is flush with the top end face of the filter screen 3. The opening at the end of the long outer cover 4 is aligned with the square hole of the cylinder 2. The assembly of the first sealing plate 6, the second sealing plate 7, the long plate 8, and the backflush mechanism slides within the square hole of the cylinder 2. In the working state, the assembly is located directly above the filter screen 3; in the standby state, the assembly is located inside the long outer cover 4. When the assembly is above the filter screen 3, the first sealing plate 6 seals the square hole of the cylinder through its outer sealing ring; when the assembly is inside the long outer cover 4, the second sealing plate 7 seals the square hole of the cylinder through its outer sealing ring. The sealing plates 7 have completely identical structures, and they all perfectly match the outline of the square holes on the sidewalls of the cylinder 2; a sealing ring is provided on the outer walls of the first sealing plate 6 and the second sealing plate 7; the long plate 8 is located between the first sealing plate 6 and the second sealing plate 7, and the two ends of the long plate 8 are respectively located at the bottom ends of the sidewalls of the first sealing plate 6 and the second sealing plate 7; the housing of the electric cylinder 5 is located at the end of the outer wall of the long strip cover 4 away from the cylinder 2, and its piston rod passes through the sidewall of the long strip cover 4 and connects to the sidewall of the first sealing plate 6; the electric cylinder 5 drives the assembly of the first sealing plate 6, the second sealing plate 7, the long plate 8 and the recoil mechanism to pass through the square hole of the cylinder through the extension and retraction of its piston rod; the signal input terminal of the electric cylinder 5 is connected to the signal output terminal of the CPU; the assembly of the first sealing plate 6, the second sealing plate 7 and the long plate 8 passes through the square hole of the cylinder 2; the recoil mechanism is located on the top surface of the long plate 8.
[0017] The recoil mechanism includes a hollow cylinder 9, a first hollow rod 10, a second hollow rod 11, and a rotary joint 12; the bottom end of the hollow cylinder 9 is axially connected to the center of the top surface of the long plate 8; the hollow cylinder 9 can rotate at the center of the upper surface of the long plate 8; the ends of the first hollow rod 10 and the second hollow rod 11 are symmetrically arranged on both sides of the circumferential sidewall of the hollow cylinder 9; the inner cavities of the first hollow rod 10 and the second hollow rod 11 are both connected to the inner cavity of the hollow cylinder 9; when the hollow cylinder 9 rotates, it drives the first hollow rod 10, the second hollow rod 11, and the rotary joint 12. A hollow rod 10 and a second hollow rod 11 rotate synchronously, and the high-pressure airflow injected into the hollow cylinder 9 also enters the first hollow rod 10 and the second hollow rod 11 through the hole where the cylinder and the hollow rod meet. Multiple bottom nozzles are provided at the bottom ends of both the first hollow rod 10 and the second hollow rod 11. The bottom nozzles at the bottom of the hollow rods spray high-pressure airflow onto the filter screen, backflushing and removing impurities from the filter screen. A side... The nozzles, including the side nozzles, are connected to the inner cavity of the first hollow rod 10. The reaction force of the high-pressure airflow ejected from the side nozzles drives the hollow rod to rotate, thereby enabling the bottom nozzles to perform a comprehensive backwashing treatment on the filter screen. The rotary joint 12 is mounted on the first sealing plate 6 via a bracket, and the bottom end of the rotary joint 12 is connected to the top interface of the hollow cylinder 9. The rotary joint 12 body does not rotate, but its bottom connector rotates synchronously with the hollow cylinder 9, thereby ensuring that the rotary joint 12 smoothly delivers high-pressure air into the hollow cylinder. Inside 9; the top end of the rotary joint 12 is connected to the rigid connecting pipe, and the other end of the rigid connecting pipe passes through the first sealing plate 6; an air pump is provided outside the cylinder 2, and a hose is provided at the air outlet of the air pump, and the hose passes through the long outer cover 4 and is connected to the end of the rigid connecting pipe inside the long outer cover 4; the high-pressure airflow drawn by the air pump enters the rotary joint 12 after passing through each pipe, and then passes through the hollow cylinder 9 and each hollow rod in sequence, and finally sprays out from the nozzle; the signal input terminal of the air pump is connected to the signal output terminal of the CPU.
[0018] A magnetic induction switch is embedded on the end face of the first sealing plate 6 near the hollow cylinder 9, and a magnet is embedded on the end face of the second sealing plate 7 near the hollow cylinder 9; magnets are provided at the ends of the first hollow rod 10 and the second hollow rod 11 away from the hollow cylinder 9; the signal output terminal of the magnetic induction switch is connected to the signal input terminal of the CPU; the magnetic induction switch can check whether the center line of the hollow rod is parallel to the center line of the long plate 8. Only when the center line of the hollow rod is parallel to the center line of the long plate 8 can the hollow rod pass smoothly through the square hole of the cylinder 2; when the center line of the hollow rod is parallel to the center line of the long plate 8, the magnetic induction switch can sense the magnetic attraction force from the magnet at the end of the hollow rod.
[0019] The brushing section includes a rotary motor 13, a U-shaped frame 14, and thin rods 15. The rotary motor 13 is located at the center of the bottom surface of the filter screen 3, and the end of its piston rod is connected to the center of the U-shaped frame 14. Thin rods 15 are provided at both ends of the U-shaped frame 14, and brushes are provided on the top surface of each thin rod 15, with the brushes contacting the bottom surface of the filter screen 3. The signal input terminal of the rotary motor 13 is connected to the signal output terminal of the CPU. The operation of the rotary motor 13 drives the thin rods 15 to rotate, and the brushes on the rotating thin rods 15 perform brushing treatment on the bottom surface of the filter screen 3.
[0020] The CPU module in this utility model is model 87C196KC.
[0021] Operating principle: When the air pressure sensor in the coal powder silo detects that the air pressure value is too high, this device is activated, solenoid valve 1 is opened and the air pump is started to pump air out of the coal powder silo to reduce the air pressure value inside the coal powder silo until the air pressure value inside the coal powder silo is reduced to a reasonable range, and then solenoid valve 1 and air pump are closed.
[0022] During the use of this device, the filter screen 3 is cleaned periodically. During cleaning, the solenoid valve 1 and the air pump are in the closed state. The cleaning process is as follows: the rotary motor 13 is started to drive the thin rod 15 to rotate, which in turn drives the brush to clean the bottom surface of the filter screen 3. At the same time, the pneumatic cylinder 5 pushes the backflushing mechanism to move directly above the filter screen 3. Then the air pump is started, and the nozzles at the bottom of the first hollow rod 10 and the second hollow rod 11 spray high-pressure airflow to wash the filter screen 3. The side nozzles on the side wall of the first hollow rod provide lateral force to ensure that it can rotate. This allows the two hollow rods to backflush and clean the filter screen 3 below them during rotation. Because the lateral thrust is large enough, it can overcome the attraction force when the ends of the hollow rods pass the magnet of the sealing plate. The hollow rod is rotated smoothly. After the cleaning operation has been running for a period of time, the rotary motor and air pump are turned off. At this time, the hollow rod slowly stops rotating due to inertia. During this process, due to the attraction of the magnet, the end of the hollow rod is attracted and stops when it approaches the sealing plate. At this time, the magnet triggers the signal of the magnetic induction switch, indicating that the hollow rod has reached the correct position and its center line is parallel to the center line of the long plate, so it can pass smoothly through the square hole of the cylinder 2. If the magnetic induction switch does not respond after a period of time, the pneumatic air pump is briefly activated to make the hollow rod rotate. This is repeated until the magnet at the end of the hollow rod is attracted and stops by the magnet on the sealing plate. Then, the electric cylinder 5 is activated to pull the first sealing plate 6, the second sealing plate 7, the long plate 8 and the recoil mechanism assembly back into the long outer cover 4.
Claims
1. A pressure relief device suitable for pulverized coal silos, characterized in that: The system includes a solenoid valve (1), a cylinder (2), a vacuum pump, a filter screen (3), a backflushing section, and a brush section. An interface is provided at the top of the coal powder silo's side wall, and the first interface of the solenoid valve (1) is located at the interface at the top of the coal powder silo. The bottom end of the cylinder (2) is connected to the second interface of the solenoid valve (1). A sealing cover is provided at the top of the cylinder (2), with a hole in the center of the sealing cover, and the vacuum pump is connected to the center hole of the sealing cover via a pipe. The filter screen (3) is located on the inner wall of the cylinder (2). The backflushing section is located on the side wall of the cylinder (2), directly above the filter screen (3). The brush section is located at the center of the bottom surface of the filter screen (3). The signal input terminals of the solenoid valve (1) and the vacuum pump are connected to the signal output terminal of the CPU. A pressure sensor is provided on the inner wall of the coal powder silo, and its signal output terminal is connected to the signal input terminal of the CPU.
2. The pressure relief device for pulverized coal silos according to claim 1, characterized in that: The backflush section includes a long outer cover (4), an electric cylinder (5), a first sealing plate (6), a second sealing plate (7), a long plate (8), and a backflush mechanism; the long outer cover (4) is set on the outer wall of the cylinder (2), and its end in contact with the cylinder (2) is open; a square hole is provided on the side wall of the cylinder (2), and the bottom end face of the square hole is flush with the top end face of the filter screen (3); the opening at the end of the long outer cover (4) is aligned with the square hole of the cylinder (2); the structures of the first sealing plate (6) and the second sealing plate (7) are completely identical, and they both perfectly match the outline of the square hole on the side wall of the cylinder (2); the outer walls of the first sealing plate (6) and the second sealing plate (7) are both A sealing ring is provided; the long plate (8) is located between the first sealing plate (6) and the second sealing plate (7), and the two ends of the long plate (8) are located at the bottom end of the side wall of the first sealing plate (6) and the bottom end of the side wall of the second sealing plate (7), respectively; the housing of the electric cylinder (5) is located at the end of the outer wall of the long strip cover (4) away from the cylinder (2), and its piston rod passes through the side wall of the long strip cover (4) and is connected to the side wall of the first sealing plate (6); the signal input end of the electric cylinder (5) is connected to the signal output end of the CPU; the combination of the first sealing plate (6), the second sealing plate (7) and the long plate (8) passes through the square hole of the cylinder (2); the recoil mechanism is located on the top surface of the long plate (8).
3. The pressure relief device for pulverized coal silos according to claim 2, characterized in that: The recoil mechanism includes a hollow cylinder (9), a first hollow rod (10), a second hollow rod (11), and a rotary joint (12); the bottom end of the hollow cylinder (9) is axially connected to the center of the top surface of the long plate (8); the ends of the first hollow rod (10) and the second hollow rod (11) are symmetrically arranged on both sides of the circumferential sidewall of the hollow cylinder (9); the inner cavities of the first hollow rod (10) and the second hollow rod (11) are connected to the inner cavity of the hollow cylinder (9); multiple bottom nozzles are abutted on the bottom end faces of the first hollow rod (10) and the second hollow rod (11); the long side of the first hollow rod (10) is perpendicular to the sidewall. A side nozzle is provided at one end away from the hollow cylinder (9), and the side nozzle is connected to the inner cavity of the first hollow rod (10); the rotary joint (12) is mounted on the first sealing plate (6) by a bracket, and the bottom end of the rotary joint (12) is connected to the top interface of the hollow cylinder (9); the top end of the rotary joint (12) is connected to the rigid connecting pipe, and the other end of the rigid connecting pipe passes through the first sealing plate (6); an air pump is provided outside the cylinder (2), and a hose is provided at the air outlet of the air pump, and the hose passes through the long outer cover (4) and is connected to the end of the rigid connecting pipe inside the long outer cover (4); the signal input end of the air pump is connected to the signal output end of the CPU.
4. The pressure relief device for pulverized coal silos according to claim 3, characterized in that: A magnetic induction switch is embedded on the end face of the first sealing plate (6) near the hollow cylinder (9), and a magnet is embedded on the end face of the second sealing plate (7) near the hollow cylinder (9); magnets are provided at the ends of the first hollow rod (10) and the second hollow rod (11) away from the hollow cylinder (9); the signal output terminal of the magnetic induction switch is connected to the signal input terminal of the CPU.
5. The pressure relief device for pulverized coal silos according to claim 4, characterized in that: The brush section includes a rotary motor (13), a U-shaped frame (14), and thin rods (15); the rotary motor (13) is located at the center of the bottom surface of the filter screen (3), and the end of its piston rod is connected to the center of the U-shaped frame (14); thin rods (15) are provided at both ends of the U-shaped frame (14), and brushes are provided on the top surface of the thin rods (15), and the brushes are in contact with the bottom surface of the filter screen (3); the signal input terminal of the rotary motor (13) is connected to the signal output terminal of the CPU.