An online plugging device for blast furnace gas pipeline

Abstract

The utility model provides an online leak stoppage device of blast furnace gas pipeline, including: outer arc plate 1, the side of outer arc plate 1 towards the pipeline to be stopped up has the same arc surface with the pipeline to be stopped up, is provided with exhaust hole (10) on arc surface, exhaust hole (10) communicates with the leak hole of the pipeline to be stopped up and leak hole (70), exhaust hole (10), exhaust pipe (2) are concentric, exhaust pipe (2) is welded with outer arc plate 1, and the orthographic projection of exhaust pipe (2) on outer arc plate (1) covers exhaust hole (10), sealing adhesive layer (5) is set up between outer arc plate (1) and the pipeline to be stopped up, is provided with the valve (3) for closing exhaust pipe (2) on the side of exhaust pipe (2) away from outer arc plate (1), still be provided with the temporary fixing device (4) of fixing outer arc plate (1) on the pipeline to be stopped up by fastening ring, the utility model solves the problem of the unsafe of blast furnace gas pipeline leak stoppage.

Description

Technical Field

[0001] This utility model belongs to the technical field of blast furnace gas equipment and relates to an online leak sealing device for blast furnace gas pipelines. Background Technology

[0002] Blast furnace gas is a byproduct of blast furnace ironmaking and a type of fuel that steel plants can obtain for free. Blast furnace gas is characterized by its high water and ash content, which causes a large amount of ash to accumulate in the pipelines. Due to the chemical properties of blast furnace gas, the pipeline walls become severely corroded after long-term use. Once rusted through, gas leaks will occur. Under normal circumstances, it is impossible to shut off the gas supply in time to deal with the leak. If the leak is not dealt with in time, it poses a significant safety hazard and may cause accidents such as poisoning, injury or death, and fire.

[0003] Current technology involves pressurized lap welding to repair point leaks without interrupting gas supply or purging. This involves fabricating a precast steel component that matches the leak point and welding it to the leak to seal it. However, lap welding for point leaks in blast furnace gas pipelines requires a high wall thickness in the surrounding pipes. If the wall thickness is too thin, welding may cause perforation of the surrounding pipes, creating new leaks or increasing the gas leakage. Furthermore, the welding process demands high skill levels from the welder, as well as precise control of the welding current and the quality of the welding rods. Additionally, the purity and pressure of the gas within the pipeline must be maintained during welding. Negative pressure in the pipeline during welding could potentially cause a fire or explosion. Therefore, the existing method carries significant safety risks during construction. Chinese patent CN110953437A discloses a blast furnace gas pipeline leak-sealing device and method, which solves the problem of significant safety risks during construction. However, during the process of installing the plug to seal the exhaust pipe, there is a risk of gas poisoning, and the plug is not easy to disassemble to help users detect water accumulation in the blast furnace gas pipeline. In addition, the steel clamp made of flat iron is prone to shrinkage or expansion during changes in ambient temperature, which can easily cause the sealant layer on the inner surface of the outer arc plate to detach from the leak-sealed pipeline, resulting in renewed gas leakage. Therefore, it is essential to improve the existing technology to address the safety and unreliability issues of blast furnace gas pipeline leak sealing. Utility Model Content

[0004] The purpose of this invention is to provide an online leak sealing device for point leaks in blast furnace gas pipelines, so as to solve the problem of unsafe leak sealing in existing blast furnace gas pipelines.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A blast furnace gas pipeline sealing device includes an outer arc plate, the side of which facing the pipeline to be sealed has the same arc shape as the pipeline, and an exhaust hole is provided on the arc surface. The exhaust hole is connected to the leak hole of the pipeline to be sealed, and the leak hole, exhaust hole, and exhaust pipe are concentric. An exhaust pipe is welded to the outer arc plate, and the orthographic projection of the exhaust pipe on the outer arc plate covers the exhaust hole. A sealing adhesive layer is provided between the outer arc plate and the pipeline to be sealed to bond the outer arc plate and the pipeline to be sealed together and to provide a sealing function. A valve for closing the exhaust pipe is provided on the side of the exhaust pipe away from the outer arc plate. A temporary fixing device is also provided to fix the outer arc plate to the pipeline to be sealed by a fastening ring.

[0006] Furthermore, the exhaust pipe includes a fixed section and a threaded section. The fixed section is welded to the outer arc plate, the threaded section has an external thread, and the valve is a stainless steel threaded straight ball valve with an internal thread that mates with the external thread.

[0007] Furthermore, the temporary fixing device includes at least two oppositely arranged fastening rings, which are distributed on both sides of the vent hole of the outer arc plate and surround the pipe to be plugged.

[0008] Furthermore, the inner surface roughness Ra of the outer arc plate is greater than or equal to 25 micrometers and less than or equal to 50 micrometers.

[0009] Furthermore, the sealing adhesive layer also includes waterproof tape, which is placed at the edge of the outer arc plate and at least a portion of the waterproof tape is connected to the pipe to be sealed.

[0010] The innovative principle and beneficial effects of this utility model are as follows: When using the blast furnace gas pipeline sealing device with the above-described structure, the outer arc plate and the pipeline to be sealed are glued and sealed using a sealing adhesive layer. Because it has an exhaust pipe, water and gas at the leak point can be discharged through the exhaust pipe during the sealing process. The outer arc plate is then fixed to the pipeline using a temporary fixing device. Finally, the exhaust pipe is sealed by closing the threaded valve on the exhaust pipe side, thus completing the sealing work. Opening the threaded valve on the exhaust pipe side allows for real-time monitoring of water accumulation in the blast furnace gas pipeline. When using the blast furnace gas pipeline sealing device of this application, welding of the pipeline to be sealed is not required, effectively improving safety during the sealing process. This effectively solves the safety problem of unsafe blast furnace gas pipeline sealing in the prior art, preventing the formation of new leaks in the pipeline; the structure is simple and easy to operate. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a blast furnace gas pipeline sealing device.

[0012] Figure 2This is a front view of the blast furnace gas pipeline sealing device during the sealing process.

[0013] Figure 3 This is a left view of the blast furnace gas pipeline sealing device during the sealing process.

[0014] Figure 4 This is a schematic diagram of the outer arc plate structure of the blast furnace gas pipeline sealing device.

[0015] Figure 5 This is a schematic diagram showing the connection between the outer arc plate of the blast furnace gas pipeline sealing device and the exhaust pipe and valve.

[0016] In the diagram: 1. Outer arc plate; 10. Vent hole; 2. Vent pipe; 3. Valve; 4. Temporary fixing device; 5. Sealing adhesive layer; 6. Waterproof tape; 7. Pipe to be plugged; 70. Leak hole. Detailed Implementation

[0017] like Figures 1-5 As shown, the blast furnace gas pipeline sealing device includes an outer arc plate 1, an exhaust pipe 2, a valve 3, a temporary fixing device 4, and a sealing adhesive layer 5.

[0018] The outer arc plate 1 has an arc-shaped surface on the side facing the pipe to be plugged, which is the same as the outer wall of the pipe. The outer arc plate 1 is provided with an exhaust hole 10, which is connected to the leak hole 70 of the pipe to be plugged. The exhaust pipe 2 is welded to the outer arc plate 1, and the orthographic projection of the exhaust pipe 2 on the outer arc plate 1 covers the exhaust hole 10. A valve 3 for closing the exhaust pipe 2 is provided on the side of the exhaust pipe 2 away from the outer arc plate 1. A temporary fixing device 4 is also provided to fix the outer arc plate 1 to the pipe to be plugged by a fastening ring.

[0019] When using the blast furnace gas pipeline sealing device with the above-described structure, the outer arc plate 1 and the pipeline to be sealed are bonded and sealed using a sealing adhesive layer. Because of the vent pipe 2, water and gas at the leak can be discharged through the vent pipe 2 during the bonding and sealing process of the outer arc plate 1. Before the high-temperature sealing adhesive layer cures, the outer arc plate 1 is fixed to the pipeline to be sealed using a temporary fixing device 4. Finally, the vent pipe 2 can be sealed using a valve 3 to complete the sealing work. When using the blast furnace gas pipeline sealing device of this application, welding of the pipeline to be sealed is not required, thus effectively improving the safety performance during the sealing process. This effectively solves the problem of unsafe blast furnace gas pipeline sealing in the prior art.

[0020] Specifically, the leak hole 70, vent hole 10, and vent pipe 2 are concentric. This arrangement effectively ensures that water and gas discharged through the leak hole can be discharged through the vent pipe 2, thus guaranteeing the effectiveness of the sealing adhesive layer. The vent pipe 2 includes a fixed section and a threaded section. The fixed section is welded to the outer arc plate 1, and the threaded section has external threads. The threaded section of the vent pipe is connected to the valve 3, and the valve 3 has internal threads that mate with the external threads. The temporary fixing device 4 includes at least two opposing temporary fixing rings. One end of each fixing ring is fastened to both sides of the outer arc plate 1, and the other end of the two fixing rings is fastened to and surrounds the pipe to be sealed. This arrangement effectively ensures a tighter fit between the outer arc plate 1 and the pipe to be sealed before the high-temperature sealant layer is fully cured, thus guaranteeing the sealing effect. The sealing adhesive layer 5 fills the space between the outer arc plate 1 and the pipe to be sealed. The sealing adhesive layer 5 is a high-temperature sealant layer. In one specific embodiment, the high-temperature sealant layer is a high-temperature sealing cold welding adhesive or an industrial repair agent. Furthermore, the high-temperature sealant layer exhibits excellent mechanical properties after curing and demonstrates high bonding strength with the outer arc plate 1. It possesses superior properties such as wear resistance, oil resistance, water resistance, and resistance to various chemical corrosions, and can withstand temperatures of 200℃ and above. It also exhibits no shrinkage after curing and can be machined in various ways. In working environments where open flame welding is prohibited, it can replace welding for cold welding repairs. The surface roughness Ra of the inner surface of the outer arc plate 1 is greater than or equal to 25 micrometers and less than or equal to 50 micrometers. This design effectively ensures the contact effect between the sealing adhesive layer 5 and the inner wall of the outer arc plate 1.

[0021] Optionally, the sealing adhesive layer 5 also includes waterproof tape 6, which is disposed at the edge of the outer arc plate 1, and at least a portion of the waterproof tape 6 is connected to the pipe to be sealed. This arrangement prevents the high-temperature sealant layer from flowing outwards when it has not yet cured.

[0022] In one specific embodiment of this application, the waterproof tape is made of PVC + hot melt adhesive, with product specifications of 150x10cm, and features leak-proof, moisture-proof, and high-viscosity properties. The method for sealing leaks in blast furnace gas pipelines includes: The high-temperature sealant of the sealing adhesive layer of the blast furnace gas pipeline sealing device is applied to the inner surface of the outer arc plate 1 of the blast furnace gas pipeline sealing device, and the outer arc plate 1 is attached to the pipeline to be sealed.

[0023] The fastening ring of the temporary fixing device 4 of the blast furnace gas pipeline sealing device, which is set opposite to each other, fixes the outer arc plate 1 to the pipeline to be sealed, and the edge of the outer arc plate 1 and the connection between the pipeline to be sealed are sealed by the waterproof tape 6 at the sealing adhesive layer; after the high temperature sealant cures to form a high temperature sealant layer, the exhaust pipe 2 of the blast furnace gas pipeline sealing device is sealed by closing the valve 3 of the blast furnace gas pipeline sealing device.

[0024] The high-temperature sealant of the sealing adhesive layer of the blast furnace gas pipeline sealing device is applied to the inner surface of the outer arc plate 1 of the blast furnace gas pipeline sealing device, and after the outer arc plate 1 is attached to the pipeline to be sealed, the blast furnace gas pipeline sealing method further includes: placing the blast furnace gas pipeline sealing device for more than 48 hours under an ambient temperature of 20 degrees Celsius to allow the high-temperature sealant to cure; the placement time can be reduced as the ambient temperature increases.

[0025] After the high-temperature sealant has cured and formed a high-temperature sealant layer, remove the waterproof tape 6 and dismantle the temporary fixing device 4.

[0026] The method for sealing leaks in blast furnace gas pipelines further includes: detecting the amount of gas leakage before using the blast furnace gas pipeline sealing device to seal the leak in the pipeline to be sealed; and using a drainage pipe to drain water from the leak in the pipeline to be sealed before using the blast furnace gas pipeline sealing device to seal the leak in the pipeline.

Claims

1. An online leak-sealing device for blast furnace gas pipelines, comprising: An outer arc plate (1) has an arc-shaped surface on the side facing the pipe to be plugged, which is the same as the pipe to be plugged. An exhaust hole (10) is provided on the arc-shaped surface. The exhaust hole (10) is connected to the leak hole (70) of the pipe to be plugged, and the leak hole (70), the exhaust hole (10), and the exhaust pipe (2) are concentric. An exhaust pipe (2) is welded to the outer arc plate (1), and the orthographic projection of the exhaust pipe (2) on the outer arc plate (1) covers the exhaust hole (10). A sealing adhesive layer (5) is provided between the outer arc plate (1) and the pipe to be plugged to bond the outer arc plate (1) and the pipe to be plugged together and to seal. The feature is that a valve (3) for closing the exhaust pipe (2) is provided on the side of the exhaust pipe (2) away from the outer arc plate (1). A temporary fixing device (4) is also provided to fix the outer arc plate (1) to the pipe to be plugged by a fastening ring.

2. The online leak-sealing device for blast furnace gas pipelines according to claim 1, characterized in that, The exhaust pipe (2) includes a fixed section and a threaded section. The fixed section is welded to the outer arc plate (1). The threaded section has an external thread. The valve (3) is a stainless steel threaded straight ball valve and the valve (3) has an internal thread that mates with the external thread.

3. The online leak-sealing device for blast furnace gas pipelines according to claim 1, characterized in that: The temporary fixing device (4) includes at least two fastening rings arranged opposite each other, which are distributed on both sides of the vent hole (10) of the outer arc plate (1) and surround the pipe to be plugged.

4. The online leak-sealing device for blast furnace gas pipelines according to claim 1, characterized in that: The inner surface roughness Ra of the outer arc plate (1) is greater than or equal to 25 micrometers and less than or equal to 50 micrometers.

5. The online leak-sealing device for blast furnace gas pipelines according to claim 1, characterized in that: The sealing adhesive layer (5) also includes waterproof tape (6), which is disposed at the edge of the outer arc plate (1) and at least a portion of the waterproof tape (6) is connected to the pipe to be sealed.

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