A rust removal device for pipelines in polyvinyl chloride stripping process

Abstract

This utility model relates to the field of rust removal technology for pipelines in steam stripping processes, specifically to a rust removal device for pipelines in polyvinyl chloride (PVC) steam stripping processes. The device includes a spiral structure; one end of the spiral structure is connected to a tubular structure; the spiral structure and the tubular structure are installed in the medium channel of a steam pipeline; the spiral structure guides the steam within the steam pipeline, causing it to rotate; the rust removal device is fixed within the medium channel based on the tubular structure; at least one of the spiral structure and the tubular structure is a permanent magnet. This utility model incorporates both a spiral and a tubular structure. The spiral structure increases the adsorption area while simultaneously guiding the steam flow, thereby further increasing the contact ratio between the steam and the permanent magnet. Compared to existing iron removal equipment, this utility model is smaller in size, has higher adsorption efficiency, and avoids the adhesion of iron impurities inside the steam pipeline after magnetization.

Description

Technical Field

[0001] This utility model application relates to the field of rust removal technology for pipelines used in steam stripping processes, and in particular to a rust removal device for pipelines used in polyvinyl chloride (PVC) steam stripping processes. Background Technology

[0002] In the stripping process of polyvinyl chloride (PVC) production, pipelines are exposed to high temperatures, moisture, and trace amounts of corrosive media for extended periods, making them prone to internal corrosion. Besides rust, other ferromagnetic impurities may also be present (such as iron filings and welding slag left over from pipeline installation or maintenance). Corrosion not only affects pipeline flow efficiency but can also lead to rust contamination of materials, impacting product quality. The current stripping process involves directly adding steam to the hot slurry and spraying water (steam condensate) at the top of the tower. The steam and steam condensate contain approximately 0.835 mg / L of iron ions. These iron ions entering the stripping tower system will directly enter the resin, affecting its dielectric properties and reducing its whiteness.

[0003] Existing technology uses permanent magnets for iron removal. Multiple sets of permanent magnets are evenly arranged along the circumference of the inside of the pipe to form a ring-shaped high-intensity magnetic field. Under the action of the magnetic field, ferromagnetic impurities are adsorbed onto the surface of the permanent magnets or onto the inner wall of the pipe in the area of ​​the magnetic field. As the operating time increases, the iron removal capacity of the permanent magnets will decrease, and the ferromagnetic impurities need to be cleaned. The permanent magnets need to be disassembled and removed for cleaning. However, the multiple sets of permanent magnets are difficult to disassemble, and the ferromagnetic impurities attached to the inner wall of the pipe due to the magnetic field are difficult to clean. Utility Model Content

[0004] This application provides a rust removal device for pipelines in the stripping process of polyvinyl chloride. It is equipped with a spiral structure and a tubular structure. The spiral structure increases the adsorption area while guiding the steam, thereby further improving the contact ratio between the steam and the permanent magnet. Compared with existing iron removal equipment, this utility model has a small size, high adsorption efficiency, and can avoid the adsorption of iron impurities in the steam pipeline after magnetization.

[0005] To achieve the above objectives, this application provides the following technical solution: A rust removal device for pipelines used in a polyvinyl chloride (PVC) stripping process includes a permanent magnet separator; one end of the permanent magnet separator is a spiral structure; the other end is a tubular structure, wherein the spiral structure and the tubular structure are installed in the medium channel of a steam pipeline; the rust removal device is fixed within the medium channel based on the tubular structure; the spiral structure and / or the tubular structure are permanent magnets. Specifically, both the spiral structure and the tubular structure are permanent magnets, or one of the spiral structure and the tubular structure is a permanent magnet.

[0006] Specifically, the tubular structure is provided with an outer nest; the outer nest is provided with an external thread.

[0007] Specifically, the tubular structure has an internal nest; the spiral structure is fixedly installed on the internal nest.

[0008] Specifically, the rust removal device further includes an inlet flange and an outlet flange; a rust removal pipe is provided between the inlet flange and the outlet flange; the spiral structure and the tubular structure are installed inside the rust removal pipe; the rust removal device is connected to the steam pipe based on the inlet flange and the outlet flange.

[0009] This invention can also fix the rust removal device inside the steam pipe; the outer diameter of the tubular structure matches the inner diameter of the steam pipe port. The inner wall of the steam pipe port is provided with internal threads, and the steam pipe and the tubular structure are connected by these threads.

[0010] Specifically, permanent magnet separators are installed at each branch node of the steam pipeline. The inner wall of the steam pipeline is engraved with internal threads, and the outer wall of the tubular structure of the permanent magnet separator is engraved with external threads. A handle is installed inside the tubular structure to facilitate the rotation and turning of the rust removal device. The tubular structure is connected to the steam pipeline by rotating the handle. During cleaning and disassembly, the permanent magnet separator is removed by rotating the handle.

[0011] Specifically, the spiral structure of the permanent magnet separator increases the contact area between the permanent magnet separator and the steam, reducing the force of the magnetic field and the amount of deposits on the inner wall of the pipe. Furthermore, the increased contact area through the spiral structure allows for better adsorption of ferrous impurities in the steam.

[0012] Specifically, the spiral structure design of the permanent magnet separator causes the steam in the steam pipe to rotate, so that when the steam passes through the pipe at high speed, it interacts with the spiral structure, thereby changing the speed and direction of the steam and causing the steam to flow towards the core of the pipe, reducing contact with the pipe wall. This reduces the corrosion of the pipe wall by the steam and the adsorption of ferrous impurities by the pipe wall.

[0013] By adopting the above technical solution, this utility model can bring the following beneficial effects: This invention employs a permanent magnet arranged in a spiral structure with a tubular threaded structure at its end, effectively removing iron ions from steam. It also solves the problem of iron impurities from rust adsorbed by magnetization of the inner wall of steam pipes. This invention prevents the accumulation of iron impurities on the inner wall of pipes over long-term use, thus avoiding the impact of iron impurities on the dielectric properties and whiteness of the resin in the ion adsorption equipment downstream of the steam pipe. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of one embodiment of the rust removal device for pipelines in the polyvinyl chloride stripping process according to this utility model; Figure 2 This is an end view of one specific embodiment of the tubular structure in this utility model; Figure 3 This is a schematic diagram of another embodiment of the rust removal device for pipelines in the polyvinyl chloride stripping process according to this utility model. Among them: 1. Permanent magnet iron separator; 101. Tubular structure; 102. Spiral structure; 103. Handle; 2. External thread; 3. Internal thread; 4. Steam pipe; 5. Outlet flange; 6. Internal nesting; 7. External nesting; 8. Inlet flange; 9. Rust removal pipe. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0017] In one embodiment of this utility model, a rust removal device for a pipeline in a polyvinyl chloride stripping process is provided, comprising a permanent magnet separator 1; one end of the permanent magnet separator 1 is a spiral structure 102; the other end is a tubular structure 101, the spiral structure 102 and the tubular structure 101 are installed in the medium channel of a steam pipeline 4; the rust removal device is fixed in the medium channel based on the tubular structure 101; the spiral structure 102 and / or the tubular structure 101 are permanent magnets. Specifically, both the spiral structure 102 and the tubular structure 101 are permanent magnets, or one of the spiral structure 102 and the tubular structure 101 is a permanent magnet.

[0018] like Figure 1As shown, the rust removal device also includes an inlet flange 8 and an outlet flange 5; the inlet flange 8 and the outlet flange 5 are connected to the steam pipe 4, and a rust removal pipe 9 is provided between the inlet flange 8 and the outlet flange 5; wherein the spiral structure 102 and the tubular structure 101 are installed inside the rust removal pipe 9. In this embodiment, a discontinuous interval section is provided in the steam pipe 4, and flanges are provided at both ends of the interval section. When installing the rust removal device of this embodiment on the steam pipe 4, the inlet flange 8 and the outlet flange 5 are connected based on the two flanges at both ends of the interval section; after the steam pipe 4 has been running for a period of time, the rust removal pipe 9 is removed from this interval section; the tubular structure 101 and the spiral structure 102 are taken out from the rust removal pipe 9 for cleaning, and after cleaning, the rust removal device is reinstalled on the interval section.

[0019] In this embodiment, the tubular structure is threadedly connected to the rust removal pipe 9.

[0020] Compared to existing rust removal equipment, this embodiment directly interacts with steam inside the steam pipe 4. The spiral structure 102 has a large adsorption surface and can guide the steam to rotate, further improving the adsorption effect on a unit volume of water vapor. The adsorption effect of existing rust removal equipment can be achieved simply by setting the spiral structure 102 as a permanent magnet. If the tubular structure 101 is also set as a permanent magnet, the rust removal efficiency can be further improved. Because the tubular structure 101 magnetizes the rust removal pipe 9, rust adheres to the inner surface of the rust removal pipe 9 after a certain period of time. Therefore, in this embodiment, the rust removal pipe 9 can be completely disassembled, and only the adhered rust inside the rust removal pipe 9 needs to be cleaned to solve the problem of rust accumulation in the steam pipe 4 of existing rust removal equipment.

[0021] In this embodiment, an outer nest 7 is provided outside the tubular structure 101; a connecting thread is provided outside the outer nest 7; the rust removal device is installed inside the rust removal pipe 9 based on the connecting thread outside the outer nest 7.

[0022] The tubular structure 101 has an inner nest 6; the spiral structure 102 is fixedly installed on the inner nest 6.

[0023] like Figure 1 As shown, in this embodiment, the outer nest 7 is threadedly connected to the rust-removing pipe 9 based on its own connecting thread; the tubular structure 101 is internally provided with an inner nest 6; as shown Figure 2 As shown, the inner nest 6 has a mounting hole, and the end of the spiral structure 102 is fixedly embedded in the mounting hole. In this embodiment, the inner nest 6 and the outer nest 7 are made of nylon material or ABS (acrylonitrile-butadiene-styrene copolymer) with certain elasticity and corrosion resistance.

[0024] In this embodiment, the spiral structure 102 of the permanent magnet separator 1 interacts with steam as it flows through the channel. The direction of steam movement is guided by the spiral structure 102, generating a velocity component along the tangential direction of the spiral. According to Newton's third law, the steam exerts a reaction force on the spiral structure 102, and the tangential component of this force forms a torque around the pipe axis. Therefore, the spiral direction in the spiral structure 102 of the permanent magnet separator 1 is consistent with the installation rotation direction of the permanent magnet separator 1 installed in the steam pipe 4. The embodiments of this application are not applicable to high-flow-rate, large-diameter pipes (the magnetic field coverage is limited, and "leakage" is likely to occur).

[0025] The spiral structure 102 design increases the contact area with steam, enabling better adsorption of ferrous impurities in the steam. Simultaneously, the spiral structure 102 guides the steam's movement, generating a velocity component along the spiral tangential direction, reducing the contact between the steam and the pipe's inner wall, thereby reducing steam corrosion of the pipe. Furthermore, It also reduces deposits on the inner wall of the pipe.

[0026] During installation, it is important to note that the permanent magnet separator 1 should be installed on a horizontal pipe, and there should be a sufficient length of straight pipe section before and after it (generally twice the pipe diameter before and after) to stabilize the steam flow rate and ensure that ferromagnetic impurities can flow evenly through the magnetic field area of ​​the permanent magnet separator 1, thereby improving the adsorption efficiency.

[0027] Generally, due to the high steam flow rate and the fine rust particles, a sufficiently strong magnetic field gradient (magnetic field strength changes rapidly with distance) is required to overcome the fluid impact and adsorb the rust. It is recommended to select a matching magnetic device (e.g., a magnet with a diameter of - mm corresponding to a DN00 pipe) based on the pipe's inner / outer diameter and choose a permanent magnet separator with a surface magnetic field strength of not less than 000 Gauss (adjustable according to pipe diameter and flow rate). The magnetic field structure can be altered by changing the screw pitch to extend the residence time of the rust in the magnetic field.

[0028] In this embodiment, the tubular structure 101 and / or the spiral structure 102 are made of common materials for permanent magnets (such as neodymium iron boron, ferrite, samarium cobalt, etc.), and can all be processed into a spiral shape. For sintered permanent magnets (such as neodymium iron boron), a near-spiral blank is usually first pressed out using a mold, and then sintered, magnetized, and finished into a spiral structure 102 by precision machining (such as wire cutting, grinding). For bonded permanent magnets (such as bonded neodymium iron boron), they can be directly formed in one step using a spiral mold through injection molding or pressing processes, which is relatively easier to process.

[0029] The magnetization direction of a spiral permanent magnet can be designed, magnetizing along the tangent of the spiral to form a magnetic field surrounding the spiral.

[0030] Depending on the amount of ferromagnetic impurities in the steam, the adsorbed rust will gradually cover the magnetic field area, causing the magnetic field strength to decrease. A cleaning cycle should be established (generally cleaned once a month). During cleaning, the valves before and after the permanent magnet separator 1 should be closed first. When the steam pipe 4 is at high temperature and high pressure, the steam in the pipe should be vented and cooled down, otherwise there is a safety risk. Use a special tool (such as a non-magnetic scraper) to remove the ferromagnetic impurities adsorbed on the permanent magnet separator 1. A high-temperature resistant permanent magnet material (such as high-temperature samarium cobalt) should be selected according to the steam temperature to avoid magnetic failure due to high temperature.

[0031] The magnetic field strength of permanent magnet separator 1 should be tested quarterly. If a significant decrease in magnetic field strength is found (below 0% of the design value), permanent magnet separator 1 should be replaced promptly to ensure iron removal efficiency. Severe impacts to the magnets of permanent magnet separator 1 may cause magnetic attenuation; therefore, during installation, cleaning, and maintenance, avoid striking or subjecting permanent magnet separator 1 to severe vibrations.

[0032] The spiral structure 102 of the permanent magnet separator 1 in this embodiment can effectively solve the problems of iron ions in steam and iron impurities generated by magnetic field adsorption and corrosion of the inner wall of the pipe, thereby reducing the iron ion content in the steam and reducing the iron impurities generated by magnetic field adsorption and corrosion of the inner wall of the pipe.

[0033] In this embodiment, the connection between the permanent magnet separator 1 and the pipeline is not limited to threaded connection; snap-fit ​​connection can also be selected. The advantage of snap-fit ​​connection is that it does not require screws, glue, or other auxiliary parts, resulting in high assembly efficiency and low cost. However, its load-bearing capacity is limited. In practical applications, the appropriate type should be selected based on the magnitude of the force, the frequency of use, and environmental requirements.

[0034] In another embodiment of this utility model, such as Figure 3 As shown, the rust removal device is fixed inside the steam pipe 4; the outer diameter of the tubular structure 101 matches the inner diameter of the port of the steam pipe 4. The tubular structure 101 is provided with an external thread 2, and the inner wall of the port of the steam pipe 4 is provided with an internal thread 3. The steam pipe 4 and the tubular structure 101 are connected by threads.

[0035] In one embodiment, a handle 103 is provided inside the tubular structure 101 to facilitate rotation and twisting during assembly and disassembly. In this embodiment, the handle 103 is embedded in the inner nest 6 or is embedded in the tubular structure 101 in a keyway manner.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A pipe rust removal device for a polyvinyl chloride stripping process, characterized by, It includes a spiral structure (102); one end of the spiral structure (102) is connected to a tubular structure (101); the spiral structure (102) and the tubular structure (101) are installed in the medium channel of the steam pipe (4); the flow guide of the spiral structure (102) causes the steam in the steam pipe (4) to rotate; the rust removal device is fixed in the medium channel based on the tubular structure (101); Wherein: at least one of the spiral structure (102) and the tubular structure (101) is a permanent magnet.

2. The rust removal device for pipelines in the polyvinyl chloride stripping process according to claim 1, characterized in that, The tubular structure (101) is provided with an outer nest (7); the outer nest (7) is provided with a connecting thread.

3. The rust removal device for pipelines in the polyvinyl chloride stripping process according to claim 2, characterized in that, The tubular structure (101) has an inner nest (6) inside; the spiral structure (102) is fixedly installed on the inner nest (6).

4. The polyvinyl chloride stripping process piping deruster of claim 3, wherein, The rust removal device also includes an inlet flange (8) and an outlet flange (5); a rust removal pipe (9) is provided between the inlet flange (8) and the outlet flange (5); the spiral structure (102) and the tubular structure (101) are installed in the rust removal pipe (9); the rust removal device is connected to the steam pipe (4) based on the inlet flange (8) and the outlet flange (5).

5. The polyvinyl chloride stripping process piping deruster of claim 1 wherein, The rust removal device is fixed inside the steam pipe (4); the outer diameter of the tubular structure (101) matches the inner diameter of the port of the steam pipe (4).

6. The polyvinyl chloride stripping process pipe de-rusting apparatus according to claim 5, characterized in that, The inner wall of the port of the steam pipe (4) is provided with an internal thread (3), and the steam pipe (4) is connected to the tubular structure (101) by the thread.

7. The polyvinyl chloride strip process piping deruster of claim 1 wherein, The tubular structure (101) is provided with a handle (103) to facilitate the rotation and turning of the tubular structure (101).

8. The polyvinyl chloride strip process piping deruster of claim 1 wherein, The spiral direction of the spiral structure (102) is consistent with the rotation direction of the tubular structure (101) during installation.

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