Method for repairing leakage point pipeline of positive pressure concentrated phase conveying system

Abstract

The invention discloses a method for repairing a leakage point pipeline of a positive-pressure concentrated-phase conveying system, and relates to the technical field of pipeline repairing, and the method comprises the following steps: step 1, providing aluminum silicate thermal insulation cotton and sodium silicate water glass for later use; 2, according to the size of a leakage point of the pipeline and the diameter of the pipeline, tearing the aluminum silicate heat preservation cotton into a plurality of parts, and soaking the parts in sodium silicate water glass; 3, the soaked aluminum silicate heat preservation cotton is pasted to the leakage point of the outer wall of the pipeline and the periphery of the leakage point, and plugging of the leakage point is formed; the leakage point pipeline can be rapidly repaired, and meanwhile the copper concentrate ignition can be avoided.

Description

Technical Field

[0001] This invention relates to the field of pipeline repair technology, specifically a method for repairing leaks in a positive pressure dense phase transport system. Background Technology

[0002] In the flash copper smelting process, a positive pressure dense-phase conveying system transports mixed copper concentrate and flue dust to the furnace top silo for material preparation. Due to the continuous friction and collision of the copper concentrate inside the conveying pipeline with the inner wall, the pipe wall easily thins and develops holes at bends and other areas. Large amounts of flue dust leaking from these holes can pollute the environment, necessitating a halt to the transport of copper concentrate and flue dust. This leads to a reduction in the flash furnace charge or even a shutdown, impacting production. Therefore, timely repair of these leaks is crucial. Current technology typically employs welding for repairs, which has several drawbacks: firstly, the high sulfur content in copper concentrate makes it highly flammable, posing significant safety hazards to upstream and downstream equipment and on-site maintenance personnel; secondly, welding repairs require approval from production management, a lengthy process that, combined with other preparations, takes at least 3-4 hours, resulting in prolonged flash furnace charge reduction or shutdown and severe production disruptions. Summary of the Invention

[0003] The purpose of this invention is to provide a method for repairing leaking pipelines in a positive pressure dense phase transport system, which can quickly repair leaking pipelines and thus quickly restore the normal operation of the positive pressure dense phase transport system, thereby reducing the impact of pipeline damage on flash copper smelting production.

[0004] This invention can be achieved through the following technical solution: a method for repairing a leaking pipeline in a positive pressure dense phase transport system, comprising the following steps:

[0005] Step 1: Provide aluminum silicate insulation cotton and sodium silicate water glass for later use;

[0006] Step 2: Based on the size of the leak and the diameter of the pipe, tear the aluminum silicate insulation cotton into several pieces and soak them in sodium silicate water glass.

[0007] Step 3: Apply the soaked aluminum silicate insulation cotton to the leak point and its surrounding area on the outer wall of the pipe to seal the leak.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] After soaking the aluminum silicate insulation cotton and attaching it to the leak point and its surrounding area on the outer wall of the pipe, the sodium silicate water glass in the insulation cotton gradually solidifies due to the evaporation of moisture, firmly bonding the loose fiber structure of the insulation cotton together. At the same time, it also firmly adheres the insulation cotton to the outer wall of the pipe, thus sealing the leak point. From step 1 to step 3, the entire process can be completed within half an hour, enabling rapid pipe repair and quick restoration of the normal operation of the positive pressure dense phase conveying system, thereby reducing the impact of pipe damage on flash copper smelting production. Attached Figure Description

[0010] Figure 1 This is a diagram showing the location of the leak in the pipeline.

[0011] Figure 2 A schematic diagram showing the application of aluminum silicate insulation cotton to the outer wall of a pipe.

[0012] Figure 3 This is a schematic diagram of a cylindrical box being welded to the outer wall of a pipe.

[0013] Figure 4 This is a schematic diagram showing the cylinder cover installed at the opening of the cylindrical box. Detailed Implementation

[0014] A method for repairing a leaking pipeline in a positive pressure dense phase transport system includes the following steps:

[0015] Step 1: Provide aluminum silicate insulation cotton and sodium silicate water glass for later use;

[0016] Step 2: Based on the size of the leak point A1 in pipe A and the diameter of pipe A, tear the aluminum silicate insulation cotton into several pieces and soak them in sodium silicate water glass.

[0017] Step 3: Apply the soaked aluminum silicate insulation cotton to the leak point A1 and its surrounding area on the outer wall of pipe A to form a seal 20 for leak point A1.

[0018] In the above scheme, the aluminum silicate insulation cotton is a porous, lightweight material formed by interwoven aluminum silicate fibers. It has numerous fiber gaps within, exhibiting excellent high-temperature resistance and insulation performance, and is not easily corroded, oxidized, or decomposed. Sodium silicate water glass, on the other hand, is a viscous liquid with good permeability, strong adhesion, and high-temperature resistance. When the aluminum silicate insulation cotton is immersed in sodium silicate water glass, the water glass penetrates deep into the pores and fiber gaps of the insulation cotton, filling the spaces originally occupied by air. For example... Figure 2As shown, after the soaked aluminum silicate insulation cotton is pasted onto the leak point A1 and its surrounding area on the outer wall of pipe A, the moisture in the aluminum silicate insulation cotton evaporates rapidly due to the nearly 100°C temperature on the pipe wall, since the materials required for the flash furnace are all dried and dehydrated. The sodium silicate water glass in the aluminum silicate insulation cotton gradually solidifies, firmly bonding the loose fiber structure of the aluminum silicate insulation cotton together. At the same time, the aluminum silicate insulation cotton is firmly adhered to the outer wall of pipe A, thus sealing the leak point A1 on the outer wall of pipe A and preventing soot from being discharged outside pipe A. In addition, since steps 1 to 3 do not involve hot work, there is no risk of copper concentrate ignition. At the same time, this step can be performed before obtaining relevant approvals from the production management department, enabling timely repair of pipe A. The entire process can be completed within half an hour, which can quickly restore the normal operation of the positive pressure dense phase conveying system, reduce the time for flash furnace material reduction or shutdown, and thus reduce the impact of pipeline damage on flash copper smelting production.

[0019] Furthermore, in step 1, the aluminum silicate insulation cotton and sodium silicate water glass are prepared in a 1:3 ratio; this ensures that the aluminum silicate insulation cotton is fully immersed in the sodium silicate water glass solution, guaranteeing that the fiber structure in the aluminum silicate insulation cotton is bonded together to form a whole and that the aluminum silicate insulation cotton is bonded to pipe A.

[0020] The above-mentioned repair method for leaking pipelines in a positive pressure dense phase transport system also includes the following steps:

[0021] Step 4: According to the dimensions of pipe A, make a cylindrical box 10 from steel plate and weld one end of the cylindrical box 10 to the outer wall of pipe A around the leak point A1;

[0022] Step 5: Prepare an appropriate amount of silicon carbide ramming mix and water, and mix them evenly in a ratio of 20:1.

[0023] Step 6: Pour the mixture from step 5 into the cylindrical box 10 for filling;

[0024] Step 7: Install a cover 11 at the opening of the cylindrical box 10.

[0025] Once the leak point A1 on the outer wall of pipe A and the surrounding aluminum silicate insulation cotton have solidified and hardened to form a seal 20, pipe A can now transport materials normally. That is, steps 4 to 7 are all performed under normal operating conditions of pipe A. Steps 4 to 7 aim to further improve the structural strength of the seal 20, such as... Figure 3As shown, the cylindrical box 10 is made of steel plate and welded to the outer wall of pipe A, preventing external damage to the aluminum silicate insulation cotton; the main component of silicon carbide ramming mix is ​​silicon carbide particles, which have good wear resistance and high temperature resistance. Adding 5% water wets the particle surface, reducing inter-particle friction and making the material easier to mix evenly. It also imparts a certain degree of plasticity to the mixture, facilitating its filling onto the top of the aluminum silicate insulation cotton inside the cylindrical box 10, forming a second barrier to prevent soot leakage; Figure 4 As shown, a cover 11 is provided at the opening of the cylindrical box 10, so that the cylindrical box 20 and the cover plate 21 together form a third barrier to prevent soot leakage, further strengthening the sealing structure.

[0026] In step 2 above, the immersion time of the aluminum silicate insulation cotton in sodium silicate water glass is 60±5 seconds; to ensure that the aluminum silicate insulation cotton absorbs enough sodium silicate water glass.

[0027] In step 3 above, when attaching the aluminum silicate insulation cotton to the leak point A1 and its surrounding area of ​​pipe A, press the aluminum silicate insulation cotton on the outer wall of pipe A. It should be noted that the pressing pressure should be appropriate to avoid squeezing out a large amount of sodium silicate water glass from the aluminum silicate insulation cotton. Appropriate pressing of the aluminum silicate insulation cotton can squeeze out the air inside the aluminum silicate insulation cotton, so that the aluminum silicate insulation cotton can fully adhere to the outer wall of pipe A.

[0028] In step 3 above, the aluminum silicate insulation cotton soaked in sodium silicate water glass solidifies and hardens for 10 minutes before other steps are implemented. Since the pipe wall of pipe A has a temperature of nearly 100°C, the aluminum silicate insulation cotton pasted on the outer wall of pipe A will firmly adhere to pipe A after 10 minutes. After that, pipe A can continue to carry out transportation operations and other repair steps.

Claims

1. A method for repairing a leaking pipeline in a positive pressure dense phase transport system, characterized in that: Includes the following steps: Step 1: Provide aluminum silicate insulation cotton and sodium silicate water glass for later use; Step 2: Based on the size of the leak point (A1) and the diameter of the pipe (A), tear the aluminum silicate insulation cotton into several pieces and soak them in sodium silicate water glass. Step 3: Apply the soaked aluminum silicate insulation cotton to the leak point (A1) and its surrounding area on the outer wall of the pipe (A) to seal the leak point (A1) (20).

2. The method for repairing leaking pipelines in a positive pressure dense phase transport system according to claim 1, characterized in that: In step 1, aluminum silicate insulation cotton and sodium silicate water glass are prepared in a ratio of 1:

3.

3. The method for repairing leaking pipelines in a positive pressure dense phase transport system according to claim 1 or 2, characterized in that: It also includes the following steps: Step 4: According to the dimensions of pipe (A), make a cylindrical box (10) using steel plate, and weld one end of the cylindrical box (10) to the outer wall of pipe (A) around the leak point (A1); Step 5: Prepare an appropriate amount of silicon carbide ramming mix and water, and mix them evenly in a ratio of 20:

1. Step 6: Fill the cylindrical box (10) with the mixture stirred in step 5. Step 7: Install a cap (11) at the opening of the cylindrical box (10).

4. The method for repairing leaking pipelines in a positive pressure dense phase transport system according to claim 1 or 2, characterized in that: In step 2, the aluminum silicate insulation cotton is immersed in sodium silicate water glass for 60±5 seconds.

5. The method for repairing leaking pipelines in a positive pressure dense phase transport system according to claim 1 or 2, characterized in that: In step 3, when attaching the aluminum silicate insulation cotton to the leak point (A1) and its surrounding area of ​​the pipe (A), press the aluminum silicate insulation cotton on the outer wall of the pipe (A).

6. The method for repairing leaking pipelines in a positive pressure dense phase transport system according to claim 1, characterized in that: In step 3, the aluminum silicate insulation cotton soaked in sodium silicate water glass should solidify and harden for 10 minutes before proceeding with other steps.

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