Non-stop plugging method for positive pressure flue gas pipeline

Abstract

The invention relates to the technical field of pipeline leaking stoppage, and discloses a positive pressure flue gas pipeline non-stop leaking stoppage method which comprises the following steps that a section of concave steel bar is provided, and a hole is drilled in the bottom of the concave steel bar; a nut is welded on the hole; the two ends of the concave steel bar are welded above a leakage hole of the sulfur dioxide flue gas pipeline; asbestos blocks soaked with windshield washer fluid are placed at the leaking holes below the concave steel bars; and pressing the asbestos block by using an iron sheet, penetrating a screw rod through a nut hole in the concave steel bar, and gradually screwing the screw rod until the asbestos block is completely pressed. By the adoption of the plugging method without shutdown, shutdown maintenance caused by pipeline leakage in the production process is avoided, the influence of shutdown time on a production line is remarkably reduced, continuous operation of equipment is guaranteed, safety in the plugging process is guaranteed by selecting a high-temperature-resistant and corrosion-resistant material and an accurately-controlled construction technology, and the production efficiency is improved. And the risk of operation in a high-temperature and high-pressure environment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline plugging, and in particular to a method for plugging leakage in a positive pressure flue gas pipeline without shutting down the machine. Background Art

[0002] Positive pressure flue gas duct refers to a pipeline system in which the gas pressure inside the pipeline is higher than the external atmospheric pressure. It is usually used to transport high temperature and high pressure gases, such as flue gas and waste gas discharged in industrial production. Due to the high gas pressure in the pipeline, if the pipeline leaks, the gas will quickly spray out from the leak point. Therefore, the sealing requirements of the positive pressure flue gas duct are very high. The leakage problem of industrial flue gas pipelines, especially sulfur dioxide flue gas pipelines, is usually solved by replacing the entire damaged pipe section after shutdown or welding. However, these methods have obvious shortcomings. First, shutdown maintenance requires suspension of production, resulting in a decrease in production efficiency. Especially in the case of continuous production, downtime will cause significant economic losses to the enterprise. Secondly, the traditional welding leak repair method is only suitable for repairing small leaks. For flue gas pipelines with large-area corrosion or multiple leaks, the welding effect is often not ideal, and long-term sealing cannot be guaranteed. In addition, the operating environment of the flue gas pipeline is usually accompanied by high temperature, high pressure and corrosive gases, which makes welding operations during shutdown a safety hazard, increasing the difficulty and danger of maintenance.

[0003] Existing leak-proof materials and technologies are prone to aging, falling off and other problems in highly corrosive environments, resulting in a short-lasting sealing effect and requiring frequent maintenance and replacement, which not only increases maintenance costs but may also cause secondary pollution to the environment.

[0004] In view of the deficiencies in the prior art, a non-stop leak plugging method for a positive pressure flue gas duct is provided. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method for plugging leaks in a positive pressure flue gas duct without shutting down the machine, which solves the problem that the existing leak-proof materials and technologies are prone to aging and falling off in a highly corrosive environment, resulting in a short-lasting sealing effect and requiring frequent maintenance and replacement.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for plugging leaks in a positive pressure flue gas duct without shutting down the machine, comprising the following steps:

[0007] Provide a concave steel bar and drill a hole at the bottom of the concave steel bar;

[0008] welding a nut on the hole;

[0009] The two ends of the concave steel bar are welded above the leaking hole of the sulfur dioxide flue gas duct;

[0010] Place asbestos blocks soaked in glass water at the leaking holes below the concave steel bars;

[0011] Use an iron sheet to press the asbestos block, and pass a screw through the nut hole on the concave steel bar, and gradually tighten the screw until the asbestos block is completely pressed.

[0012] Preferably, the number of drilled holes at the bottom of the concave steel bar is 2 to 4, the diameter of the drilled holes is matched according to the specifications of the screw, and anti-corrosion treatment is performed around the drilled holes to improve the durability of the drilled holes.

[0013] Preferably, the concave steel bar is made of stainless steel or other alloy materials with corrosion resistance, and the surface of the steel bar is subjected to rust-proof treatment to increase its service life.

[0014] Preferably, the asbestos block is subjected to high temperature treatment after cutting to enhance its sealing performance, and is soaked in glass water for at least 30 minutes before use to ensure sufficient absorption.

[0015] Preferably, the glass water is an acidic or neutral solution, and the glass water contains an anti-corrosion additive to improve the durability of the asbestos block in a sulfur dioxide fume environment.

[0016] Preferably, the nut is fixed above the hole of the concave steel bar by laser welding, the internal thread of the nut matches the external thread of the screw, and the outer surface of the nut is also coated with a high temperature resistant and anti-corrosion material.

[0017] Preferably, the iron sheet is made of carbon steel or stainless steel, and the thickness of the iron sheet is adjusted according to the pressure conditions of the flue gas duct. The surface of the iron sheet may also be coated with an anti-corrosion coating to prevent corrosion damage caused by long-term contact with sulfur dioxide flue gas.

[0018] Preferably, the screw is made of metal and has corrosion resistance. The surface of the screw is galvanized or nickel-plated. The tightening force of the screw is precisely controlled by using a torque wrench to avoid sealing failure caused by excessive squeezing of the asbestos block.

[0019] Preferably, the length of the concave steel bar is customized according to the size of the flue gas duct, and the concave steel bar is pre-bent before welding to ensure that it can fit closely to the surface of the duct after welding.

[0020] Preferably, the operating state of the flue gas duct does not need to be adjusted or shut down during the plugging operation, and after the plugging is completed, the junction between the concave steel bar and the flue gas duct can be sealed for a second time to further ensure the sealing of the flue gas duct.

[0021] The present invention provides a method for plugging leaks in a positive pressure flue gas duct without shutting down the machine. It has the following beneficial effects:

[0022] 1. The present invention adopts a plugging method without stopping the machine, thus avoiding the shutdown for maintenance due to pipeline leakage during the production process, significantly reducing the impact of downtime on the production line, and ensuring the continuous operation of the equipment. At the same time, by selecting high temperature resistant and corrosion resistant materials and precisely controlled construction technology, the safety of the plugging process is ensured, and the risk of operation under high temperature and high pressure environment is reduced.

[0023] 2. The present invention significantly enhances the corrosion resistance and sealing performance of the plugging device by performing anti-corrosion treatment on key components such as concave steel bars, nuts, and screws, as well as high-temperature treatment and glass water immersion treatment on asbestos blocks, thereby reducing the risk of leakage caused by corrosion and wear, extending the service life of the flue gas duct and its leak-proof structure, and reducing the maintenance frequency and replacement cost of the equipment.

[0024] 3. The present invention pre-bends the concave steel bar and performs secondary sealing to ensure that the concave steel bar can fit tightly with the pipe surface, avoiding the risk of leakage due to poor bonding or material aging. The secondary sealing treatment further enhances the sealing performance, thereby ensuring the stability and reliability of the plugging structure in long-term use, ensuring that the flue gas duct can still maintain good sealing in harsh working environments, and reducing the possibility of environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example:

[0028] Please refer to the attached Figure 1 The embodiment of the present invention provides a non-stop leak plugging method for a positive pressure flue gas duct, comprising the following steps:

[0029] Provide a concave steel bar and drill a hole at the bottom of the concave steel bar;

[0030] welding a nut on the hole;

[0031] The two ends of the concave steel bar are welded above the leaking hole of the sulfur dioxide flue gas duct;

[0032] Place asbestos blocks soaked in glass water at the leaking holes below the concave steel bars;

[0033] Use an iron sheet to press the asbestos block, and pass a screw through the nut hole on the concave steel bar, and gradually tighten the screw until the asbestos block is completely pressed.

[0034] Specifically, a section of concave steel bar is provided, and holes are drilled at the bottom thereof, the number of holes being 2 to 4, the diameter of the holes being matched according to the specifications of the screw, and anti-corrosion treatment is performed around the holes; then, a nut is welded on the hole, the nut is fixed above the hole of the concave steel bar by laser welding, the inner thread of the nut matches the outer thread of the screw, and the outer surface of the nut is coated with a high-temperature resistant and anti-corrosion material; then, the two ends of the concave steel bar are welded above the leak of the sulfur dioxide flue gas duct, the welding process adopts gas shielded welding to improve the strength and corrosion resistance of the welding point, and the concave steel bar is pre-bent before welding to ensure that it can fit closely to the surface of the pipeline; at the leak below the concave steel bar, an asbestos block soaked in glass water is placed, the asbestos block is subjected to high-temperature treatment before use to enhance the sealing performance, and is soaked in glass water for at least 30 minutes to ensure full absorption, the glass water is an acidic or neutral solution containing anti-corrosion additives; Afterwards, the asbestos block is pressed with an iron sheet, the material of the iron sheet is carbon steel or stainless steel, the surface is coated with an anti-corrosion coating, and the thickness of the iron sheet is adjusted according to the pressure conditions of the flue gas duct; finally, a screw is passed through the nut hole on the concave steel bar, and the screw is gradually tightened. The screw is made of metal and is galvanized or nickel-plated, and the tightening force of the screw is accurately controlled by a torque wrench to ensure that the asbestos block is completely pressed and there is no sealing failure caused by excessive extrusion. After the plugging operation is completed, the joint of the concave steel bar and the flue gas duct is sealed for the second time to further improve the sealing of the duct, thereby achieving the effect of plugging the leak without stopping the machine. By adopting structures such as concave steel bars, nuts, and screws, combined with the sealing performance of the asbestos block, effective sealing of the leaking eyes of the sulfur dioxide flue gas duct is achieved, and there is no need to stop the machine for maintenance. The operation is simple, time-saving and labor-saving, which significantly improves production efficiency and reduces material and maintenance costs, while extending the service life of the pipeline.

[0035] The number of drilled holes at the bottom of the concave steel bar is 2 to 4, the diameter of the drilled holes is matched according to the specifications of the screw rod, and anti-corrosion treatment is performed around the drilled holes to improve the durability of the drilled holes.

[0036] Specifically, the number of drill holes at the bottom of the concave steel bar is 2 to 4, and the diameter of the drill holes is matched according to the specifications of the screw to ensure that the screw can pass through and be tightened smoothly. At the same time, anti-corrosion treatment is performed around the drill holes, including covering the edges of the drill holes with anti-corrosion coatings or chemically treating them to improve the durability and corrosion resistance of the drill holes, thereby maintaining structural stability in a long-term sulfur dioxide flue gas environment and avoiding sealing failure due to corrosion. By optimizing the design of the number, diameter and anti-corrosion treatment of the drill holes, the close combination of the screw and the concave steel bar is ensured, which improves the durability and corrosion resistance of the entire plugging device, thereby extending the service life of the equipment and reducing the maintenance frequency.

[0037] The concave steel bar is made of stainless steel or other alloy materials with corrosion resistance, and the surface of the steel bar is subjected to rust-proof treatment to increase its service life.

[0038] Specifically, the material of the concave steel bar is stainless steel or other corrosion-resistant alloy materials. These materials can maintain high strength and stability in a highly corrosive environment. In order to further enhance the corrosion resistance of the concave steel bar, an anti-rust treatment is performed on its surface, including electroplating, spraying anti-corrosion coating or chemical passivation. This ensures that the concave steel bar will not be damaged by corrosion during long-term use, thereby extending its service life and improving the overall reliability of the equipment. By selecting corrosion-resistant materials and performing anti-rust treatment on the surface of the concave steel bar, its corrosion resistance and structural stability are effectively improved, the product's service life is extended, the maintenance frequency and replacement costs are reduced, and the safety and economy of equipment operation are improved.

[0039] The asbestos blocks are subjected to high temperature treatment after cutting to enhance their sealing performance, and are soaked in glass water for at least 30 minutes before use to ensure sufficient absorption.

[0040] Specifically, the asbestos blocks are subjected to high-temperature treatment after cutting to enhance their sealing performance. The high-temperature treatment makes the asbestos fibers tighter, thereby improving their sealing effect under high temperature and high pressure conditions. Then the asbestos blocks are soaked in glass water for at least 30 minutes before use. The ingredients in the glass water can further enhance the corrosion resistance and flexibility of the asbestos blocks, ensuring that the asbestos blocks can better fit and seal the leaks in the sulfur dioxide flue gas duct during use. At the same time, after fully absorbing the glass water, the asbestos blocks have stronger sealing effect and durability. By subjecting the asbestos blocks to high-temperature treatment and soaking in glass water, their sealing performance and corrosion resistance are significantly enhanced, thereby improving the stability and durability of the plugging effect, reducing the risk of re-leakage due to aging or corrosion of the sealing material, and further ensuring the safe operation of the flue gas duct.

[0041] The glass water is an acidic or neutral solution, and contains an anti-corrosion additive to improve the durability of the asbestos block in a sulfur dioxide fume environment.

[0042] Specifically, the pH value of the glass water is controlled within an appropriate range to ensure that it will not have an adverse effect on the pipeline material or asbestos blocks. At the same time, anti-corrosion additives are added to the glass water. These additives can effectively prevent sulfur dioxide gas from corroding the asbestos blocks and the pipeline surface. Anti-corrosion additives include metal passivators or antioxidants, etc., to ensure that the asbestos blocks fully absorb the anti-corrosion components in the glass water during the immersion process, thereby significantly improving the durability of the asbestos blocks in highly corrosive sulfur dioxide flue gas environments and extending the duration of their sealing effects. By selecting acidic or neutral glass water containing anti-corrosion additives, the corrosion resistance and service life of the asbestos blocks are significantly improved, thereby effectively preventing the recurrence of flue gas leakage, reducing maintenance frequency, and ensuring the long-term stable operation of the pipeline system.

[0043] The nut is fixed above the hole of the concave steel bar by laser welding, the internal thread of the nut matches the external thread of the screw, and the outer surface of the nut is also coated with high temperature resistant and anti-corrosion material.

[0044] Specifically, the nut is fixed above the hole of the concave steel bar by laser welding. Laser welding can achieve precise and firm welding connection, ensure high-strength bonding between the nut and the concave steel bar, and avoid loosening or falling off of the nut due to uneven welding. The internal thread of the nut matches the external thread of the screw to ensure that the screw can be smoothly screwed in and tightened. In addition, the outer surface of the nut is coated with high-temperature resistant and anti-corrosion materials, such as heat-resistant polymer coatings or ceramic coatings, to prevent the nut from oxidation or corrosion in high temperature and corrosive flue gas environments, thereby further improving the service life and connection stability of the nut. By using a laser welding process to fix the nut and coating the surface of the nut with high-temperature resistant and anti-corrosion materials, a firm connection and long-term durability between the nut and the concave steel bar are ensured, and failure of the nut in a high-temperature corrosive environment is prevented, thereby improving the reliability and life of the overall leak-proof structure.

[0045] The material of the iron sheet is carbon steel or stainless steel, and the thickness of the iron sheet is adjusted according to the pressure conditions of the flue gas duct. The surface of the iron sheet can also be coated with an anti-corrosion coating to prevent corrosion damage caused by long-term contact with sulfur dioxide flue gas.

[0046] Specifically, the material of the iron sheet is carbon steel or stainless steel, among which carbon steel sheets have good strength and toughness, and stainless steel sheets have excellent corrosion resistance. The thickness of the iron sheet is adjusted according to the pressure conditions of the flue gas duct. Specifically, thicker iron sheets are used in high-pressure environments to ensure that they will not deform or break when under pressure. At the same time, the surface of the iron sheet can also be coated with an anti-corrosion coating, such as an epoxy resin or polymer coating, to prevent the iron sheet from being corroded and damaged when in contact with sulfur dioxide flue gas for a long time. This can effectively extend the service life of the iron sheet and maintain its structural stability in a highly corrosive environment. By selecting a suitable material and thickness and coating the anti-corrosion coating on the surface of the iron sheet, the compressive strength and corrosion resistance of the iron sheet are enhanced, ensuring the long-term stability of the iron sheet in a sulfur dioxide flue gas environment, thereby improving the overall durability of the plugging structure and reducing the frequent replacement and maintenance costs caused by corrosion.

[0047] The screw is made of metal and has corrosion resistance. The surface of the screw is galvanized or nickel-plated. The tightening force of the screw is precisely controlled by using a torque wrench to avoid sealing failure caused by excessive squeezing of the asbestos block.

[0048] Specifically, the screw is made of metal, and a metal with corrosion resistance, such as stainless steel or alloy steel, is selected. The surface of the screw is galvanized or nickel-plated to increase its anti-oxidation and corrosion resistance, ensuring that the screw is not prone to rust and degradation in an environment where it is in long-term contact with sulfur dioxide flue gas. At the same time, the tightening force of the screw is precisely controlled by using a torque wrench. In specific operations, a suitable torque value is set to ensure that the screw does not exert excessive pressure on the asbestos block when tightening, avoiding deformation or damage of the asbestos block due to excessive extrusion, thereby maintaining a good sealing effect and lasting plugging performance. By performing corrosion-resistant treatment on the screw and using a torque wrench to precisely control the tightening force, the service life and reliability of the screw in a corrosive environment are effectively improved, and sealing failure caused by excessive extrusion of the asbestos block is prevented, thereby ensuring the stability of the plugging structure and a long-term sealing effect.

[0049] The length of the concave steel bar is customized according to the size of the flue gas duct, and the concave steel bar is pre-bent before welding to ensure that it can closely fit the surface of the duct after welding.

[0050] Specifically, by measuring the specific dimensions of the leak area, ensure that the length of the concave steel bar can cover the leak and provide sufficient support, and pre-bend the concave steel bar before welding, specifically including appropriately bending the concave steel bar according to the outer diameter and shape of the pipe to match the curved surface of the pipe, so that the concave steel bar can fit tightly to the pipe surface during welding, avoiding unstable welding or poor sealing due to poor fitting, thereby improving the overall reliability and sealing performance of the leak repair structure, and by customizing the length of the concave steel bar and pre-bending it so that it can fit tightly to the pipe surface, ensuring the stability of the welding and the sealing effect, and preventing leakage problems caused by poor fitting, thereby improving the reliability and durability of the leak plugging effect.

[0051] During the plugging operation, there is no need to adjust the operating state of the smoke duct or shut down the smoke duct, and after the plugging is completed, the joint between the concave steel bar and the smoke duct can be sealed for a second time to further ensure the sealing of the smoke duct.

[0052] Specifically, during the plugging operation, there is no need to adjust the operating status of the flue gas duct or shut down the machine. In the specific implementation, by selecting high-temperature resistant and corrosion-resistant materials and reasonable construction technology, it is ensured that the leak-proof device can work normally in the high-temperature and high-pressure sulfur dioxide flue gas environment, thereby avoiding production losses caused by shutdowns. At the same time, after the plugging is completed, in order to further improve the sealing effect, a secondary sealing treatment can be performed at the joint of the concave steel bar and the flue gas duct. The secondary sealing treatment includes coating a high-temperature resistant sealant at the joint or adding an additional sealing gasket layer to prevent leakage risks caused by tiny gaps or material aging, thereby ensuring the long-term sealing and safety of the pipeline. By completing the plugging operation without stopping the machine and performing a secondary sealing treatment after plugging the leak, production interruptions are effectively avoided, while further improving the sealing and safety of the pipeline, reducing potential leakage risks, ensuring the stable operation of the system and reducing maintenance costs.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for plugging leaks in a positive pressure flue gas duct without shutting down the machine, characterized in that: The following steps are involved: Provide a concave steel bar and drill a hole at the bottom of the concave steel bar; welding a nut on the hole; The two ends of the concave steel bar are welded above the leaking hole of the sulfur dioxide flue gas duct; Place asbestos blocks soaked in glass water at the leaking holes below the concave steel bars; Use an iron sheet to press the asbestos block, and pass a screw through the nut hole on the concave steel bar, and gradually tighten the screw until the asbestos block is completely pressed.

2. A non-stop plugging method for positive pressure flue gas duct according to claim 1, characterized in that: The number of drilled holes at the bottom of the concave steel bar is 2 to 4, the diameter of the drilled holes is matched according to the specifications of the screw rod, and anti-corrosion treatment is performed around the drilled holes to improve the durability of the drilled holes.

3. A non-stop positive pressure flue gas duct leak plugging method according to claim 1, characterized in that: The concave steel bar is made of stainless steel or other alloy materials with corrosion resistance, and the surface of the steel bar is subjected to rust-proof treatment to increase its service life.

4. A non-stop leak plugging method for a positive pressure flue gas duct according to claim 1, characterized in that: The asbestos blocks are subjected to high temperature treatment after cutting to enhance their sealing performance, and are soaked in glass water for at least 30 minutes before use to ensure sufficient absorption.

5. A non-stop leak plugging method for a positive pressure flue gas duct according to claim 1, characterized in that: The glass water is an acidic or neutral solution, and contains an anti-corrosion additive to improve the durability of the asbestos block in a sulfur dioxide fume environment.

6. A non-stop positive pressure flue gas duct leak plugging method according to claim 1, characterized in that: The nut is fixed above the hole of the concave steel bar by laser welding, the internal thread of the nut matches the external thread of the screw, and the outer surface of the nut is also coated with high temperature resistant and anti-corrosion material.

7. A non-stop leak plugging method for a positive pressure flue gas duct according to claim 1, characterized in that: The material of the iron sheet is carbon steel or stainless steel, and the thickness of the iron sheet is adjusted according to the pressure conditions of the flue gas duct. The surface of the iron sheet can also be coated with an anti-corrosion coating to prevent corrosion damage caused by long-term contact with sulfur dioxide flue gas.

8. A non-stop leak plugging method for a positive pressure flue gas duct according to claim 1, characterized in that: The screw is made of metal and has corrosion resistance. The surface of the screw is galvanized or nickel-plated. The tightening force of the screw is precisely controlled by using a torque wrench to avoid sealing failure caused by excessive squeezing of the asbestos block.

9. A non-stop plugging method for positive pressure flue gas duct according to claim 1, characterized in that: The length of the concave steel bar is customized according to the size of the flue gas duct, and the concave steel bar is pre-bent before welding to ensure that it can closely fit the surface of the duct after welding.

10. A non-stop leak plugging method for a positive pressure flue gas duct according to claim 1, characterized in that: During the plugging operation, there is no need to adjust the operating state of the smoke duct or shut down the smoke duct, and after the plugging is completed, the joint between the concave steel bar and the smoke duct can be sealed for a second time to further ensure the sealing of the smoke duct.

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