Anti-corrosion device and method for inner wall of spiral heat transfer tube for steam generator
By designing an anti-corrosion device on the inner wall of the spiral heat transfer tubes in the steam generator, and using vapor phase rust inhibitors and plugs to form a protective layer, the problem of heat transfer tube corrosion was solved, the operating environment and lifespan of the equipment were improved, and safety was ensured.
Patent Information
- Application Number
- CN202510915867.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-03
- Publication Date
- 2025-11-14
AI Technical Summary
The spiral heat transfer tubes of the high-temperature gas-cooled reactor steam generator are prone to corrosion during storage, transportation and assembly. Existing anti-corrosion measures are limited, which affects the operating environment and lifespan of the equipment and may even cause safety hazards.
Design a corrosion prevention device for the inner wall of a spiral heat transfer tube for a steam generator, including a guide, a vapor phase rust inhibitor rod, and a plug. The vapor phase rust inhibitor rod is inserted into the tube through the guide and the two ends are sealed with the plug. The rust-inhibiting material is released to form a protective layer to prevent oxidation reaction.
It effectively protects the inner wall of the heat transfer tube, prevents electrochemical corrosion, has a simple structure, is easy to operate, ensures close contact between the anti-rust material and the tube wall, avoids rust, and improves equipment safety and lifespan.
Smart Images
Figure CN120945375A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a corrosion prevention device and method for the inner wall of a spiral heat transfer tube used in a steam generator, belonging to the field of nuclear power technology. Background Technology
[0002] The heat exchange tubes of the high-temperature gas-cooled reactor steam generator are designed using SA-213T22 small-diameter, thin-walled (φ19mm×3mm) seamless ferritic heat-resistant steel tubes with a spiral structure. Each heat exchange tube is 80m long. This grade of steel is highly susceptible to corrosion in air. Based on the steam generator's cleanliness requirements and the T22 heat exchange tube wall thickness design, no rust is permitted. Failure to effectively protect the tubes will impact the equipment's operating environment and lifespan, potentially posing a safety hazard to the entire nuclear power system. Therefore, the T22 heat exchange tubes of the high-temperature gas-cooled reactor steam generator require anti-corrosion treatment during storage, transportation, and assembly.
[0003] Due to limitations imposed by factors such as the diameter, length, spiral structure, and cleanliness requirements of heat exchange tubes, the available anti-corrosion measures are extremely limited. Currently, the simple method of sealing both ends is often used, which makes the heat exchange tubes highly susceptible to corrosion and scrapping during storage, transportation, and assembly.
[0004] Therefore, it is necessary to conduct in-depth research on existing anti-corrosion devices and methods for the inner wall of heat transfer tubes in order to solve the above problems. Summary of the Invention
[0005] To overcome the above problems, an anti-corrosion device for the inner wall of a spiral heat transfer tube for a steam generator was designed through in-depth research, comprising:
[0006] A threader, having a rope for threading through a spiral heat transfer tube;
[0007] Vapor phase rust inhibitor 2, which has rust-preventive material and connecting end, the connecting end can be connected to the inductor so that the vapor phase rust inhibitor can enter the spiral heat transfer tube;
[0008] Blocking 3 is used to seal both ends of the spiral heat transfer tube.
[0009] In a preferred embodiment, the threader is a rope made of polyethylene plastic, longer than the spiral heat exchange tube.
[0010] In a preferred embodiment, the connecting end of the vapor phase rust inhibitor is a bolt, and the rope of the threader is tied to the bolt.
[0011] In a preferred embodiment, a protective sleeve 21 is also provided on the connecting end of the vapor phase rust inhibitor rod.
[0012] In a preferred embodiment, the central part of the vapor phase rust inhibitor rod is a steel wire rope, on which rust-inhibiting material is pressed to form the rod body.
[0013] In a preferred embodiment, the vapor phase rust inhibitor rod has a plurality of holes.
[0014] In a preferred embodiment, the vapor phase rust inhibitor rod is coiled into a disc shape.
[0015] In a preferred embodiment, the device includes a base 41, a winding disc 42, and a pressure disc 43.
[0016] The winding disc 42 is a rotatable ring, allowing the vapor phase rust inhibitor rod to be wound around the winding disc 42.
[0017] The chassis 41 and pressure plate 43 are located at both ends of the winding disc 42 to prevent the vapor phase rust inhibitor rod from falling off from both sides of the winding disc 42.
[0018] This invention also discloses a method for preventing corrosion of the inner wall of a spiral heat transfer tube for a steam generator, which employs the aforementioned anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator, and includes the following steps:
[0019] S1. Connect one end of the threader to the connecting end of the vapor phase rust inhibitor rod.
[0020] S2. Insert the inserter into one end of the spiral heat exchange tube, pass through the spiral heat exchange tube, and extend it out from one end of the spiral heat exchange tube.
[0021] S3. Pull the inserter to drive the vapor phase rust-preventing rod into the spiral heat exchange tube completely.
[0022] S4. Use a plug to seal both ends of the spiral heat exchanger tube.
[0023] The beneficial effects of this invention include:
[0024] (1) For spiral heat transfer tubes with small inner diameter, large length and complex structure, it can effectively ensure close contact between vapor phase rust prevention material and low alloy steel tube wall material, and fully protect the inner wall of heat exchange tube from electrochemical corrosion formed by water, oxygen and other substances.
[0025] (2) Simple structure and easy to operate. Attached Figure Description
[0026] Figure 1 A schematic diagram of the vapor phase rust inhibitor rod structure of the anti-corrosion device for the inner wall of a spiral heat transfer tube for a steam generator according to a preferred embodiment of the present invention is shown.
[0027] Figure 2 A corrosion protection device for the inner wall of a spiral heat transfer tube for a steam generator according to a preferred embodiment of the present invention is shown.
[0028] Figure 3 A corrosion protection device for the inner wall of a spiral heat transfer tube for a steam generator according to a preferred embodiment of the present invention is shown.
[0029] Figure 4 This invention illustrates a corrosion-resistant device for the inner wall of a spiral heat transfer tube for a steam generator according to a preferred embodiment of the present invention.
[0030] Explanation of icon numbers:
[0031] 2-Vacuum phase rust inhibitor rod;
[0032] 21-Protective cover;
[0033] 3-Blockage;
[0034] 41-Chassis;
[0035] 42-Circling disc;
[0036] 43-Pressure plate;
[0037] 441 - Finale;
[0038] 442-Compression bar. Detailed Implementation
[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.
[0040] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.
[0041] According to the present invention, a corrosion protection device for the inner wall of a spiral heat transfer tube for a steam generator is provided, such as... Figure 1-4 As shown, it includes:
[0042] A threader, having a rope for threading through a spiral heat transfer tube;
[0043] Vapor phase rust inhibitor 2, which has rust-preventive material and connecting end, the connecting end can be connected to the inductor so that the vapor phase rust inhibitor can enter the spiral heat transfer tube;
[0044] Blocking 3 is used to seal both ends of the spiral heat transfer tube.
[0045] In this invention, a rust-preventing and slow-release gas is released by a rust-preventing rod to form a dense protective layer on the inner metal wall of the spiral heat transfer tube, preventing corrosion caused by oxidation of residual oxygen and the inner wall.
[0046] In a preferred embodiment, the threader is a rope made of polyethylene plastic, which is longer than the spiral heat exchange tube, so that after it is inserted into one end of the spiral heat exchange tube, it can pass smoothly through the spiral heat exchange tube and extend out from one end of the spiral heat exchange tube.
[0047] In a preferred embodiment, the connecting end of the vapor phase rust inhibitor is a bolt, and the rope of the threader is tied to the bolt to realize the connection between the threader and the vapor phase rust inhibitor.
[0048] In a preferred embodiment, a protective sleeve 21 is also provided on the connecting end of the vapor phase rust inhibitor rod. The protective sleeve is made of silicone to prevent the bolt from scratching the inner wall of the heat exchange tube.
[0049] The rust-preventive material can be any type of vapor phase corrosion inhibitor, and there are no restrictions in this invention.
[0050] In a preferred embodiment, the central part of the vapor phase rust inhibitor rod is a steel wire rope, on which rust-inhibiting material is pressed to form the rod body.
[0051] In a preferred embodiment, the vapor phase rust inhibitor rod has a diameter of 2-6 mm, which gives the vapor phase rust inhibitor rod a certain degree of flexibility.
[0052] In a preferred embodiment, the upper surface of the vapor phase rust inhibitor rod is rough or has multiple holes to increase the contact area between the rust inhibitor material and the air, thereby improving the rust prevention effect.
[0053] Preferably, the vapor phase rust inhibitor rod is coiled into a disc shape for easy storage.
[0054] Preferably, the coil is wound on a reel, which can adopt any existing structure, such as a cable reel structure or a fishing line reel structure.
[0055] In a preferred embodiment, the device includes a base 41, a winding disc 42, and a pressure disc 43.
[0056] The winding disc 42 is a rotatable ring, allowing the vapor phase rust inhibitor rod to be wound around the winding disc 42.
[0057] The chassis 41 and pressure plate 43 are located at both ends of the winding disc 42 to prevent the vapor phase rust inhibitor rod from falling off from both sides of the winding disc 42.
[0058] In a preferred embodiment, the disc also has a pressure shaft 441 and a pressure rod 442. The bottom end of the pressure shaft 441 abuts against the pressure plate 43. A screw hole is provided on the pressure rod 442. The pressure shaft 441 has a thread. By screwing the pressure shaft 441, the pressure plate 43 is pressed to squeeze the winding disc 42, so that the winding disc 42 cannot rotate, thereby locking the vapor phase rust inhibitor rod and controlling the release and retraction of the vapor phase rust inhibitor rod.
[0059] Preferably, a handle is also provided on the pressure shaft 441 to facilitate screwing the pressure shaft 441.
[0060] Preferably, a spring is also fitted onto the pressure shaft 441.
[0061] Preferably, the plug is hinged to the end of the vapor phase rust inhibitor rod.
[0062] According to the present invention, the size of the plug is matched with the diameter of the spiral heat transfer tube, and the two ends of the spiral heat transfer tube into which the vapor phase rust inhibitor is inserted are sealed by the plug.
[0063] Preferably, the plug is made of silicone to ensure a tight seal.
[0064] This invention also discloses a method for preventing corrosion of the inner wall of a spiral heat transfer tube for a steam generator, which employs the aforementioned anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator, and includes the following steps:
[0065] S1. Connect one end of the threader to the connecting end of the vapor phase rust inhibitor rod.
[0066] S2. Insert the inserter into one end of the spiral heat exchange tube, pass through the spiral heat exchange tube, and extend it out from one end of the spiral heat exchange tube.
[0067] S3. Pull the inserter to drive the vapor phase rust-preventing rod into the spiral heat exchange tube completely.
[0068] S4. Use a plug to seal both ends of the spiral heat exchanger tube.
[0069] Preferably, in S1, a protective sleeve is fitted on the connection end to prevent the connection end from scratching the inner wall of the heat exchange tube.
[0070] Preferably, before S1, there is also S0, checking whether there is pre-existing corrosion or foreign object blockage in the spiral heat exchanger pipe. If so, the corrosion or foreign object is treated.
[0071] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this invention, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0072] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0073] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present invention based on these embodiments, all of which fall within the scope of protection of the present invention.
Claims
1. A corrosion-resistant device for the inner wall of a spiral heat transfer tube used in a steam generator, characterized in that, include: A threader, having a rope for threading through a spiral heat transfer tube; Vapor phase rust inhibitor rod (2), which has rust inhibitor material and connecting end, the connecting end can be connected to the inductor so that the vapor phase rust inhibitor rod can enter the spiral heat transfer tube; Blocking (3) is used to seal both ends of the spiral heat transfer tube.
2. The anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator according to claim 1, characterized in that, The threader is a rope made of polyethylene plastic, which is longer than the spiral heat exchange tube.
3. The anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator according to claim 1, characterized in that, The connecting end of the vapor phase rust inhibitor rod is a bolt, and the rope of the threader is tied to the bolt.
4. The anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator according to claim 3, characterized in that, A protective sleeve (21) is also fitted on the connecting end of the vapor phase rust inhibitor rod.
5. The anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator according to claim 1, characterized in that, The vapor phase rust inhibitor rod has a steel wire rope in the center, and rust-inhibiting material is pressed onto it to form the rod body.
6. The anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator according to claim 1, characterized in that, The upper surface of the vapor phase rust inhibitor rod is rough or has multiple holes.
7. The anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator according to claim 1, characterized in that, The vapor phase rust inhibitor rod is coiled into a disc shape.
8. The anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator according to claim 1, characterized in that, The device includes a base (41), a winding disc (42), and a pressure disc (43). The winding disc (42) is a rotatable ring, allowing the vapor phase rust inhibitor rod to be wound around the winding disc (42). The chassis (41) and pressure plate (43) are located at both ends of the winding disc (42) to prevent the vapor phase rust inhibitor rod from falling off from both sides of the winding disc (42).
9. A method for preventing corrosion of the inner wall of a spiral heat transfer tube for a steam generator, comprising using the aforementioned anti-corrosion device for the inner wall of the spiral heat transfer tube for a steam generator, characterized in that... Includes the following steps: S1. Connect one end of the threader to the connecting end of the vapor phase rust inhibitor rod. S2. Insert the inserter into one end of the spiral heat exchange tube, pass through the spiral heat exchange tube, and extend it out from one end of the spiral heat exchange tube. S3. Pull the inserter to drive the vapor phase rust-preventing rod into the spiral heat exchange tube completely. S4. Use a plug to seal both ends of the spiral heat exchanger tube.