A venting device for blast furnace gas pipelines

Abstract

A venting device for blast furnace gas pipelines includes a venting pipe, an outlet end of which is connected to a U-shaped pipe. The outlet end of the U-shaped pipe is connected to a buffer pipe. An automatic venting mechanism is located at the bottom of the U-shaped pipe. The automatic venting mechanism includes a guide post fixed to the inner top wall of the U-shaped pipe, a plug slidably mounted on the guide post, and a magnetic suction element on the plug. An exhaust hole is located on the U-shaped pipe at a position corresponding to the magnetic suction element, and the exhaust hole is connected to an exhaust pipe for guiding gas into a venting tower. When water is injected into the U-shaped pipe, the plug moves upward along the guide post under buoyancy and achieves a magnetic seal on the exhaust hole through the magnetic suction element. The magnetic force between the plug and the U-shaped pipe is less than the weight of the plug. When the gas pressure in the venting pipe increases and water is forced into the buffer pipe, the plug moves downward along the guide post under gravity. This invention aims to avoid the problem of gas leakage caused by a decrease in the sealing performance of the regulating valve when using a regulating valve to vent blast furnace gas pipelines.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace gas treatment equipment, specifically a venting device for blast furnace gas pipelines. Background Technology

[0002] Blast furnace gas venting refers to the process of safely burning off excess, unrecoverable, or urgently needed blast furnace gas from the pipeline through a venting tower, or directly releasing it into the atmosphere. Blast furnace gas production is continuous, but downstream consumption (such as in hot blast stoves and steel rolling mills) fluctuates. When gas production exceeds consumption, the pressure in the gas pipeline increases. To prevent excessive pressure from damaging pipeline equipment or even causing an explosion, the excess gas must be released.

[0003] In actual production processes, control valves are typically used to release coal gas. However, during long-term operation, these valves are susceptible to erosion and scaling, leading to a decrease in their sealing performance. This reduced sealing performance results in continuous coal gas leakage, causing not only significant energy waste but also exacerbating environmental pollution. Utility Model Content

[0004] The present invention aims to provide a venting device for blast furnace gas pipelines to avoid the problem of gas leakage caused by the decrease in the sealing performance of regulating valves when using regulating valves to vent blast furnace gas pipelines.

[0005] To solve the above technical problems, the specific solution adopted by this utility model is as follows: It includes a vent pipe for connecting to a blast furnace gas pipeline. The outlet end of the vent pipe is connected to the inlet end of a U-shaped pipe. The outlet end of the U-shaped pipe is connected to a buffer pipe that extends in the same direction as the U-shaped pipe. An automatic venting mechanism is provided at the bottom of the U-shaped pipe. The automatic venting mechanism includes a guide post fixed to the inner top wall of the U-shaped pipe. A plug is slidably provided on the guide post. A magnetic suction element is provided on the plug. An exhaust hole is opened on the U-shaped pipe at a position corresponding to the magnetic suction element. The exhaust hole is connected to an exhaust pipe. The exhaust pipe is used to guide the gas into the venting tower. When water is injected into the U-shaped pipe, the plug moves upward along the guide post under the action of buoyancy and achieves magnetic sealing of the exhaust hole through the magnetic suction element. The magnetic attraction between the plug and the U-shaped pipe is less than the weight of the plug. When the gas pressure in the vent pipe increases and water is forced into the buffer pipe, the plug moves downward along the guide post under the action of gravity, allowing the gas to enter the exhaust pipe through the exhaust hole.

[0006] Further optimization of a venting device for blast furnace gas pipelines: a water inlet is provided at the top of the buffer pipe, and a water outlet is provided at the bottom of the U-shaped pipe.

[0007] As a further optimization of the venting device for blast furnace gas pipelines: the magnetic suction element is a permanent magnet, and the contact surface between the magnetic suction element and the U-shaped tube is provided with an elastic protective layer that matches the curvature of the inner wall of the U-shaped tube.

[0008] As a further optimization of the venting device for blast furnace gas pipelines: a level gauge is installed at the connection between the buffer pipe and the U-tube for real-time detection of the liquid level in the buffer pipe and the U-tube.

[0009] A further optimization of the venting device for blast furnace gas pipelines: a limiting block is provided below the guide column.

[0010] Further optimization of a venting device for blast furnace gas pipelines: the bottom of the U-shaped pipe is equipped with a descaling port for cleaning deposits.

[0011] As a further optimization of the venting device for blast furnace gas pipelines: a rain cap is provided at the outlet end of the buffer pipeline. The rain cap has an umbrella-shaped structure, and an annular gap is left between the rain cap and the outlet end of the buffer pipeline.

[0012] As a further optimization of the venting device for blast furnace gas pipelines: the U-tube and the venting pipe, as well as the U-tube and the buffer pipe, are connected by flanges.

[0013] Beneficial Effects: This invention connects a U-shaped pipe and a buffer pipe to the outlet end of the vent pipe of the blast furnace gas pipeline, and injects water into the U-shaped pipe. When the gas pressure in the blast furnace gas pipeline is low, the water in the U-shaped pipe creates a water seal for the gas. When the gas pressure in the blast furnace gas pipeline is too high, the gas forces the water into the buffer pipe, and the plug of the automatic venting mechanism automatically falls, allowing the gas to be discharged through the vent hole, achieving a safe balance between gas and water pressure in the pipeline. When the downstream gas-using equipment resumes operation, the gas pressure in the blast furnace gas pipeline suddenly decreases, and the water flow in the buffer pipe gains a sudden increase in velocity, impacting the plug. Under the action of buoyancy and impact force of the water, the plug moves upward along the guide post and achieves a magnetic seal on the vent hole. This device avoids the problem of gas leakage caused by the decreased sealing performance of the regulating valve when venting the blast furnace gas pipeline using a regulating valve. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the venting device of this utility model; Figure 2 This is a schematic diagram of the venting device of this utility model; The markings in the diagram are: 1. Venting pipe, 2. Exhaust pipe, 3. Guide column, 4. Exhaust hole, 5. Protective layer, 6. Sewage removal port, 7. Water outlet, 8. Magnetic suction component, 9. Plug, 10. Limiting block, 11. U-shaped pipe, 12. Automatic venting mechanism, 13. Water inlet, 14. Rain cap, 15. Buffer pipe, 16. Level gauge, 17. Venting tower. Detailed Implementation

[0015] like Figure 1As shown, a venting device for a blast furnace gas pipeline includes a venting pipe 1 for connecting to the blast furnace gas pipeline. The venting pipe 1 is the inlet channel for gas to enter the venting device. The outlet end of the venting pipe 1 is connected to the inlet end of a U-shaped pipe 11. The water column pressure in the U-shaped pipe 11 is greater than or equal to the gas pressure in the gas pipeline under normal conditions, thereby forming a water seal. The outlet end of the U-shaped pipe 11 is connected to a buffer pipe 15 that extends in the same direction as the U-shaped pipe 11. When the gas pressure increases, the water in the U-shaped pipe 11 is forced out. The buffer pipe 15 is used to accommodate the overflow water of the U-shaped pipe 11 and provide space for water level changes.

[0016] The top of the buffer pipe 15 is provided with a water inlet 13 for replenishing water into the system to maintain the required water seal level, and the bottom of the U-shaped pipe 11 is provided with a water outlet 7 for discharging water from the system to facilitate maintenance and repair.

[0017] A level gauge 16 is installed at the connection between the buffer pipe 15 and the U-shaped pipe 11 to detect the liquid level in the buffer pipe 15 and the U-shaped pipe 11 in real time. The real-time detection of the level gauge 16 is the key basis for operators to judge whether the system is in a sealed or venting state or whether the water level is normal.

[0018] The outlet end of the buffer pipe 15 is equipped with a rain cap 14. The rain cap 14 has an umbrella-shaped structure. There is an annular gap between the rain cap 14 and the outlet end of the buffer pipe 15. The rain cap 14 is used to prevent rainwater, leaves and other foreign objects from falling directly into the buffer pipe 15. At the same time, the existence of the annular gap can ensure that the inside of the pipe is unobstructed by the atmosphere and maintain pressure balance.

[0019] like Figure 2 As shown, the U-shaped pipe 11 and the vent pipe 1, as well as the U-shaped pipe 11 and the buffer pipe 15, are connected by flanges. The flange connection facilitates the disassembly, installation and maintenance of each component, and improves the service life of the equipment.

[0020] The bottom of the U-shaped pipe 11 is provided with a cleaning port 6 for cleaning deposits. The cleaning port 6 is specifically used to clean the debris deposited at the bottom of the U-shaped pipe 11 to prevent the pipe from becoming blocked.

[0021] An automatic venting mechanism 12 is provided at the bottom of the U-shaped tube 11. The automatic venting mechanism 12 includes a guide post 3 fixed to the inner top wall of the U-shaped tube 11, a plug 9 slidably mounted on the guide post 3, and a magnetic attractor 8 on the plug 9. An exhaust hole 4 is opened on the U-shaped tube 11 at a position corresponding to the magnetic attractor 8. The exhaust hole 4 is connected to an exhaust pipe 2, which is used to guide the gas into the venting tower 17. When the pressure inside the gas pipeline is normal, the automatic venting mechanism 12 is in a sealed state, the U-shaped tube 11 is filled with water, and the plug 9 floats up along the guide post 3 under the action of buoyancy. The magnetic attractor 8 is attracted to the wall of the U-shaped tube 11, achieving a magnetic seal on the exhaust hole 4. When the pressure inside the gas pipeline is high, the automatic venting mechanism 12 is in a venting state. The pressure inside the venting pipe 1 forces the water inside the U-shaped tube 11 to flow into the buffer pipe 15, causing the plug 9 to lose buoyancy. Since the magnetic attraction between the plug 9 and the U-shaped tube 11 is less than the weight of the plug 9, the plug 9 moves along the guide post. 3. Slide down and disengage from vent 4. The high-pressure gas enters the vent pipe 2 through vent 4 and is then led to the venting tower 17. The gas in the gas pipeline is continuously produced, and the pressure in the pipeline is also continuously generated. The high-pressure gas is continuously discharged from vent 4. At this time, the gas pressure and water pressure in the pipeline are maintained in a safe balance. When the downstream equipment starts to consume gas, the gas pressure in the pipeline suddenly drops, and the water flow in the buffer pipe 15 gains a sudden increase in speed, pushing the plug 9 against the wall of the U-shaped pipe 11. Under the action of buoyancy and water flow impact, the plug 9 achieves a magnetic seal against the vent 4.

[0022] The magnetic chuck 8 is a permanent magnet, and the contact surface between the magnetic chuck 8 and the U-shaped tube 11 is provided with an elastic protective layer 5 that matches the curvature of the inner wall of the U-shaped tube 11. The protective layer 5 is used to protect the magnet from wear when it comes into contact with the U-shaped tube 11, and to prevent strong contact between the magnet and the U-shaped tube 11, thus enhancing the safety of the equipment; the elastic protective layer 5 fills the microscopic unevenness, enhancing the sealing effect.

[0023] A limiting block 10 is provided below the guide post 3. The limiting block 10 restricts the downward path of the plug 9 and prevents the plug 9 from detaching from the guide post 3.

[0024] The present invention discloses a method for using a venting device for blast furnace gas pipelines: First, water is injected into the U-shaped pipe 11 and the buffer pipe 15 through the water injection port 13 until the normal liquid level is reached, forming a water seal to seal the gas; when the pipeline is over-pressurized, the water level in the U-shaped pipe 11 drops, and the automatic venting mechanism 12 automatically opens to release pressure, maintaining the gas pressure and water pressure in a safe balance state; when the downstream gas supply resumes, the water level rises, causing the automatic venting mechanism 12 to automatically close, ending the venting process; the liquid level in the device is monitored in real time by the liquid level gauge 16, and water is replenished in the U-shaped pipe 11 in a timely manner to meet the water seal requirements.

Claims

1. A bleeder device for a blast furnace gas duct, characterized in that: The system includes a vent pipe (1) for connecting to a blast furnace gas pipeline. The outlet end of the vent pipe (1) is connected to the inlet end of a U-shaped pipe (11). The outlet end of the U-shaped pipe (11) is connected to a buffer pipe (15) that extends in the same direction as the U-shaped pipe (11). An automatic venting mechanism (12) is provided at the bottom of the U-shaped pipe (11). The automatic venting mechanism (12) includes a guide post (3) fixed to the inner top wall of the U-shaped pipe (11). A plug (9) is slidably provided on the guide post (3). A magnetic suction element (8) is provided on the plug (9). An exhaust hole (4) is opened on the U-shaped pipe (11) at a position corresponding to the magnetic suction element (8). The vent hole (4) is connected to the vent pipe (2). The vent pipe (2) is used to introduce gas into the venting tower (17). When water is injected into the U-tube (11), the plug (9) moves up along the guide post (3) under the action of buoyancy and achieves magnetic sealing of the vent hole (4) through the magnetic suction part (8). The magnetic attraction between the plug (9) and the U-tube (11) is less than the weight of the plug (9). When the gas pressure in the vent pipe (1) increases and water is forced into the buffer pipe (15), the plug (9) moves down along the guide post (3) under the action of gravity, so that the gas enters the vent pipe (2) through the vent hole (4).

2. A bleeder device for a BFG pipeline according to claim 1, characterised in that: The top of the buffer pipe (15) is provided with a water inlet (13), and the bottom of the U-shaped pipe (11) is provided with a water outlet (7).

3. A bleeder device for a BFG pipeline according to claim 1, characterised in that: The magnetic accumulator (8) is a permanent magnet, and the contact surface between the magnetic accumulator (8) and the U-shaped tube (11) is provided with an elastic protective layer (5) that is adapted to the curvature of the inner wall of the U-shaped tube (11).

4. A bleeder device for a BFG duct according to claim 1, characterised in that: A level gauge (16) is provided at the connection between the buffer pipe (15) and the U-tube (11) for real-time detection of the liquid level in the buffer pipe (15) and the U-tube (11).

5. A bleeder device for a BFG pipeline according to claim 1, characterised in that: A limit block (10) is provided below the guide post (3).

6. A bleeder device for a BFG duct according to claim 1, characterised in that: The bottom of the U-shaped pipe (11) is provided with a cleaning port (6) for cleaning up sediment.

7. A bleeder device for a BFG pipeline according to claim 1, characterised in that: The outlet end of the buffer pipe (15) is provided with a rain cap (14), which has an umbrella-shaped structure and an annular gap between the rain cap (14) and the outlet end of the buffer pipe (15).

8. A bleeder device for a BFG pipeline according to claim 1, characterised in that: The U-tube (11) and the vent pipe (1), as well as the U-tube (11) and the buffer pipe (15), are connected by flanges.

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