Method and device for recycling high-temperature superconducting strip

Abstract

The invention discloses a method and a device for recycling a high-temperature superconducting tape, and the method comprises the steps: heating a superconducting magnet to a soldering tin melting point, and obtaining a superconducting stacked tape after primary heating; naturally cooling the superconductive laminated tape subjected to primary heating to normal temperature, soaking the superconductive laminated tape in heat-conducting oil, and heating the heat-conducting oil to a soldering tin melting point to obtain a superconductive laminated tape to be separated; separating a superconducting single tape from the to-be-separated superconducting laminated tape; deoiling and cleaning the separated superconducting single tape in a concentrated manner, returning the superconducting single tape to a furnace, and scraping a tin layer to obtain a superconducting single tape to be tested; carrying out strip Ic test on the superconducting single strip to be tested to obtain the superconducting single strip passing the test; and screening and slitting the superconductive single tape passing the test, and removing the superconductive single tape which is completely invalid, so that the recycling of the superconductive tape is realized. According to the recovery method of the high-temperature superconducting tape, lossless recovery and safe reutilization of the high-temperature superconducting tape in the superconducting magnet can be achieved, and the Ic performance of the recovered high-temperature superconducting tape is basically equal to that of the high-temperature superconducting tape before use.

Description

Technical Field

[0001] The present invention belongs to the field of high-temperature superconducting magnets, and particularly relates to a method and device for recycling high-temperature superconducting tapes. Background Art

[0002] Superconducting magnet coils are generally made by stacking multiple superconducting tapes around a stainless-steel skeleton surface in a racetrack-like rotating ramp and then heating at high temperature and performing VPI (Vacuum Pressure Impregnating). For superconducting tapes in superconducting magnet coils and similar structures, there is currently no reported recycling. The main reason is that high-temperature superconducting tapes are extremely fragile materials with high technical requirements for recycling. Slight changes in temperature or external force can cause the superconducting layer to rupture, resulting in recycling failure. Therefore, when a superconducting magnet experiences quenching or defects, it is generally scrapped, causing great waste. High-temperature superconducting tapes have a multi-layer structure and complex preparation processes. Although there have been mature domestic preparation processes in recent years, their prices are still relatively high. In fact, the superconducting tapes inside a quenched or defective superconducting magnet are not completely unusable. As long as the process method and recycling equipment are appropriate, recycling and reuse can still be achieved.

[0003] Chinese Patent CN116110654A - "A Method and System for Recycling Superconducting Tapes" discloses a method for recycling superconducting tapes. However, its essence is a remedial measure for defective superconducting tapes after recycling. The superconducting tapes at the defective parts are truncated, the defects are removed, and then a protective layer is re-plated. Moreover, it is mainly used for superconducting tapes in superconducting cables. Recycling superconducting tapes in superconducting cables is very easy because the superconducting tapes in superconducting cables are all wound in a spiral process and do not involve the VPI impregnation process. Therefore, when recycling, only the shielding layer, insulating layer, and protective layer of the superconducting cable core need to be stripped to obtain complete superconducting tapes. However, it is clearly not applicable to superconducting tapes based on the VPI process or the solder impregnation process.

[0004] For high-temperature superconducting magnets based on the solder impregnation process, the bonding force between the superconducting tapes and the skeleton is relatively strong. When there are impregnation defects or repeated impregnation exercises, it is necessary to separate the superconducting tapes from the skeleton. However, it is usually very difficult to effectively separate the superconducting tapes from the skeleton and safely recycle the superconducting tapes. Summary of the Invention

[0005] To solve the foregoing technical problems, the present invention provides a method for recycling high-temperature superconducting tapes, including the following steps: S1. Heat the superconducting magnet to the melting point of the solder to obtain a once-heated superconducting tape stack; S2. Naturally cool the superconducting stacked tape after the first heating to room temperature, then soak it in heat-conducting oil, and heat the heat-conducting oil to the melting point of solder to obtain the superconducting stacked tape to be separated; S3. Separate the superconducting single tapes from the superconducting stacked tape to be separated; S4. Concentrate the separated superconducting single tapes for degreasing and cleaning, and reflow and scrape the tin layer to obtain the superconducting single tapes to be tested; S5. Conduct Ic testing on the superconducting single tapes to be tested to obtain the superconducting single tapes that pass the test; S6. Screen the superconducting single tapes that pass the test, cut and remove the completely failed superconducting single tapes to achieve the recycling and reuse of superconducting tapes.

[0006] Further, step S1 includes: S1.1. Overhead the superconducting magnet; S1.2. Heat the overhead superconducting magnet to the melting point of solder to obtain the superconducting stacked tape after the first heating.

[0007] Further, step S3 includes: S3.1. Blow away the residual tin on the surface of the superconducting tape in the superconducting stacked tape to be separated; S3.2. Automatically wind and collect one superconducting single tape in the superconducting tape with the surface residual tin blown away, and make it travel slowly to achieve separation. Repeat this step until all superconducting single tapes are separated.

[0008] Further, the heat-conducting oil is smokeless heat-conducting silicone oil.

[0009] The present invention also provides a recycling device for high-temperature superconducting tapes, including: An auxiliary tooling for overheading the superconducting magnet; An industrial oven for heating the overhead superconducting magnet to the melting point of solder to obtain the superconducting stacked tape after the first heating, and the superconducting stacked tape after the first heating is soaked in the heat-conducting oil in the auxiliary tooling; A heating table for uniformly heating the superconducting stacked tape soaked in the heat-conducting oil to the melting point of solder to obtain the superconducting stacked tape to be separated; A superconducting single tape separation mechanism for separating the superconducting single tapes from the superconducting stacked tape to be separated; An acquisition mechanism for concentrating the separated superconducting single tapes for degreasing and cleaning, and reflow and scraping the tin layer to obtain the superconducting single tapes to be tested; A tape Ic testing module for conducting Ic testing on the superconducting single tapes to be tested to obtain the superconducting single tapes that pass the test; A screening, cutting and removing mechanism for screening the superconducting single tapes that pass the test, cutting and removing the completely failed superconducting single tapes to achieve the recycling and reuse of superconducting tapes.

[0010] Further, the auxiliary tooling is stacked in sequence along the direction of tin shedding: The heightening strip is used to support the framework of the superconducting magnet, form a natural drooping space for the superconducting stacked tape after tin melting, and also form a channel for the tin to fall off after melting between the superconducting strips in the superconducting stacked tape; The tin leakage net is used to accommodate the superconducting stacked tape that naturally droops after tin melting; The tin receiving box is used to collect the tin that falls off after melting, and is also used to hold heat-conducting oil to soak the superconducting stacked tape after the first heating.

[0011] Further, the superconducting single-tape separation mechanism includes a tin remover, an automatic collection tray, and an imitation turn track, and both the tin remover and the automatic collection tray are movably connected to the imitation turn track. Among them, The tin remover is dragged forward by the first motor and is used to blow off the residual tin on the surface of the superconducting strip in the superconducting stacked tape to be separated; The automatic collection tray is dragged forward by the second motor and is used to automatically collect one superconducting single-tape from the superconducting strip with the surface residual tin blown off, and make it slowly travel along the imitation turn track to achieve separation.

[0012] Further, the first motor is a servo motor or a stepper motor, and the second motor is a servo motor or a stepper motor.

[0013] Compared with the prior art, the method for recycling high-temperature superconducting tapes provided by the present invention first heats the superconducting magnet to the melting point of the solder to obtain the superconducting stacked tape after the first heating; naturally cools the superconducting stacked tape after the first heating to room temperature, then soaks it in heat-conducting oil, and heats the heat-conducting oil to the melting point of the solder to obtain the superconducting stacked tape to be separated; then separates the superconducting single-tape from the superconducting stacked tape to be separated; concentrates and removes the oil from the separated superconducting single-tape, melts and scrapes the tin layer in the furnace to obtain the superconducting single-tape to be tested; performs Ic testing on the superconducting single-tape to be tested to obtain the superconducting single-tape passing the test; finally screens the superconducting single-tape passing the test, cuts and removes the completely failed superconducting single-tape to realize the recycling and reuse of the superconducting tape. The method for recycling high-temperature superconducting tapes can realize the non-destructive recycling and safe reuse of the high-temperature superconducting tapes in the superconducting magnet inside the nuclear fusion device after being impregnated with solder. Moreover, in production practice, the recycling of 2 reels (each reel contains 30 pieces, nearly 1000 meters) of quenched high-temperature superconducting tapes has been completed. After Ic testing, the failed parts are removed, and the Ic performance of the recycled high-temperature superconducting tapes is basically the same as that before use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shows a flowchart of the method for recycling high-temperature superconducting tapes according to an embodiment of the present invention; Figure 2 Shows a schematic structural diagram of the auxiliary tooling in the high-temperature superconducting tape recycling device according to an embodiment of the present invention; Figure 3 The structural schematic diagram of the superconducting single-tape separation mechanism in the recycling device of high-temperature superconducting tapes according to an embodiment of the present invention is shown; 1: superconducting magnet, 2: heightening strip, 3: tin leakage net, 4: tin receiving box, 5: tin remover, 6: automatic collection tray, 7: imitation turn track. Specific embodiments

[0015] The specific embodiments of the present invention will be described in detail below. It should be understood that the embodiments of the present invention are not limited to the embodiments shown in the drawings, and the protection scope of the present invention is not limited by the specific embodiments. The "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a", "one" or "the" do not indicate a quantity limitation, but indicate the existence of at least one. Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components. "Connection" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right" etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0016] Unless otherwise defined, all technical terms and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art. In addition, the meanings of the technical terms and scientific terms used in the present invention should be interpreted as having the same meaning as the corresponding terms defined in the common technical manuals, and should not be interpreted as having an idealized or overly formal meaning, unless the present invention clearly defines so.

[0017] Figure 1 The flowchart of the recycling method of high-temperature superconducting tapes according to an embodiment of the present invention is shown. Refer to Figure 1 , and the recycling method of the high-temperature superconducting tapes includes the following steps: S1. Heat the superconducting magnet 1 to the melting point of the solder to obtain the superconducting stacked tape after the first heating.

[0018] The superconducting stacked tape is an integral structure formed by stacking multiple superconducting single tapes and then soldering them with tin solder.

[0019] Among them, after heating the superconducting magnet 1 to the melting point of the solder, due to the melting of the solder, the superconducting stacked tape in the superconducting magnet 1 naturally drops under the action of gravity, realizing the natural separation of the superconducting stacked tape and the skeleton.

[0020] Specifically, the step S1 further includes: S1.1, suspend the superconducting magnet 1; S1.2, heat the suspended superconducting magnet 1 to the melting point of the solder to obtain the superconducting stacked tape after the first heating.

[0021] S2, naturally cool the superconducting stacked tape after the first heating to room temperature, then soak it in heat-conducting oil, and heat the heat-conducting oil to the melting point of the solder to obtain the superconducting stacked tape to be separated.

[0022] Wherein, after the heat-conducting oil is heated to the melting point of the solder, the tin between the superconducting strips in the superconducting stacked tape melts and falls off.

[0023] Specifically, the heat-conducting oil is smokeless heat-conducting silicone oil. Through the smokeless heat-conducting silicone oil, the superconducting stacked tape in the soaking state can be uniformly heated as a whole, and the smokeless heat-conducting silicone oil itself does not react with the superconducting strips, solder, etc. in the superconducting stacked tape.

[0024] S3, separate the superconducting single strip from the superconducting stacked tape to be separated.

[0025] Specifically, the step S3 further includes: S3.1, blow off the residual tin on the surface of the superconducting strip in the superconducting stacked tape to be separated; S3.2, automatically wind and collect one superconducting single strip from the superconducting strips with the surface residual tin blown off, and make it travel slowly to achieve separation. Repeat this step until all superconducting single strips are separated.

[0026] S4, centrally degrease and clean the separated superconducting single strips, and reflow and scrape the tin layer to obtain the superconducting single strips to be tested.

[0027] S5, test the superconducting single strips to be tested for the Ic of the strip (referring to the critical current of the strip in the superconducting state) to obtain the superconducting single strips passing the test; S6, screen the superconducting single strips passing the test, cut and remove the completely failed superconducting single strips to realize the recycling and reuse of the superconducting strips.

[0028] The present invention also provides a recycling device for high-temperature superconducting strips, including: Auxiliary tooling for suspending the superconducting magnet 1; Industrial oven for heating the suspended superconducting magnet 1 to the melting point of the solder to obtain the superconducting stacked tape after the first heating, and placing the superconducting stacked tape after the first heating in the auxiliary tooling to soak in the heat-conducting oil; Heating table for uniformly heating the superconducting stacked tape soaked in the heat-conducting oil to the melting point of the solder to obtain the superconducting stacked tape to be separated; Superconducting single strip separation mechanism for separating the superconducting single strip from the superconducting stacked tape to be separated; Retrieving mechanism, used to centrally degrease and clean the separated superconducting single tapes, re-melt and scrape the tin layer flat to obtain the superconducting single tapes to be tested; Strip Ic testing module, used to perform strip Ic testing on the superconducting single tapes to be tested and obtain the superconducting single tapes that pass the test; Screening, slitting and removing mechanism, used to screen the superconducting single tapes that pass the test, slit and remove the completely failed superconducting single tapes to achieve the recycling and reuse of superconducting tapes.

[0029] Further, Figure 2 The structural schematic diagram of the auxiliary tooling in the recycling device of high-temperature superconducting tapes according to the embodiment of the present invention is shown. Refer to Figure 2 , the auxiliary toolings are stacked in sequence along the tin shedding direction: Heightening strip 2, used to support the superconducting magnet 1 skeleton, form a natural dropping space for the superconducting stacked tapes after melting tin, and also used to form a channel for the tin melted between the superconducting tapes in the superconducting stacked tapes to drop off; Tin leakage net 3, used to accommodate the superconducting stacked tapes that naturally drop after melting tin; Tin receiving box 4, used to collect the tin that drops off after melting, and also used to hold heat-conducting oil to soak the superconducting stacked tapes after the first heating.

[0030] Further, Figure 3 The structural schematic diagram of the superconducting single tape separation mechanism in the recycling device of high-temperature superconducting tapes according to the embodiment of the present invention is shown. Refer to Figure 3 , the superconducting single tape separation mechanism includes a tin remover 5, an automatic collection tray 6, and an imitation turn track 7, and both the tin remover 5 and the automatic collection tray 6 are movably connected to the imitation turn track 7. Among them, The tin remover 5 is dragged forward by a first motor and is used to blow off the residual tin on the surface of the superconducting tapes in the superconducting stacked tapes to be separated; The automatic collection tray 6 is dragged forward by a second motor and is used to automatically and spirally collect one superconducting single tape from the superconducting tapes with the surface residual tin blown off, and make it slowly move forward along the imitation turn track 7 to achieve separation.

[0031] Specifically, the first motor and the second motor are servo motors or stepper motors.

[0032] In summary, the present invention provides a method for recycling high-temperature superconducting tapes. First, the superconducting magnet 1 is heated to the melting point of solder to obtain a superconducting laminated tape after the first heating. The superconducting laminated tape after the first heating is naturally cooled to room temperature, then immersed in heat-conducting oil, and the heat-conducting oil is heated to the melting point of solder to obtain a superconducting laminated tape to be separated. Then, the superconducting single tapes are separated from the superconducting laminated tape to be separated. The separated superconducting single tapes are concentrated for degreasing and cleaning, and the tin layer is scraped flat in a furnace to obtain superconducting single tapes to be tested. The superconducting single tapes to be tested are subjected to Ic testing of the tape to obtain the superconducting single tapes passing the test. Finally, the superconducting single tapes passing the test are screened, cut, and the completely failed superconducting single tapes are removed to realize the recycling and reuse of the superconducting tapes. The method for recycling the high-temperature superconducting tapes can realize the non-destructive recycling and safe reuse of the high-temperature superconducting tapes in the superconducting magnet inside the core components such as the nuclear fusion device after being impregnated with solder. Moreover, in production practice, the recycling of 2 coils (each coil contains 30 pieces, nearly 1000 meters) of quenched high-temperature superconducting tapes has been completed. After Ic testing, the failed parts are removed, and the Ic performance of the recycled high-temperature superconducting tapes is basically the same as that before use.

[0033] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for recycling high-temperature superconducting tapes, characterized in that, It includes the following steps: S1. Heat the superconducting magnet to the melting point of the solder to obtain the superconducting stacked tape after the first heating; S2. Naturally cool the superconducting stacked tape after the first heating to room temperature, then soak it in heat-conducting oil, and heat the heat-conducting oil to the melting point of the solder to obtain the superconducting stacked tape to be separated; S3. Separate the superconducting single tape from the superconducting stacked tape to be separated; S4. Concentrate the separated superconducting single tapes for degreasing and cleaning, and reflow them to scrape the tin layer flat to obtain the superconducting single tapes to be tested; S5. Perform strip Ic testing on the superconducting single tapes to be tested to obtain the superconducting single tapes that pass the test; S6. Screen the superconducting single tapes that pass the test, cut and remove the completely failed superconducting single tapes to realize the recycling and reuse of the superconducting tape.

2. The recycling method of the high-temperature superconducting tape according to claim 1, wherein The step S1 includes: S1.

1. Place the superconducting magnet on a support; S1.

2. Heat the superconducting magnet on the support to the melting point of the solder to obtain the superconducting stacked tape after the first heating.

3. The recycling method of the high-temperature superconducting tape according to claim 1, characterized in that, The step S3 includes: S3.

1. Blow off the residual tin on the surface of the superconducting tape in the superconducting stacked tape to be separated; S3.

2. Automatically wind and collect one superconducting single tape from the superconducting tapes with the surface residual tin blown off, and make it travel slowly to achieve separation. Repeat this step until all superconducting single tapes are separated.

4. The recycling method of the high-temperature superconducting tape according to claim 1, characterized in that, The heat-conducting oil is smokeless heat-conducting silicone oil.

5. Recycling device for high-temperature superconducting tape, characterized in that, It includes: An auxiliary tooling for placing the superconducting magnet on a support; An industrial oven for heating the superconducting magnet on the support to the melting point of the solder to obtain the superconducting stacked tape after the first heating, and soaking the superconducting stacked tape after the first heating in the heat-conducting oil in the auxiliary tooling; A heating table for uniformly heating the superconducting stacked tape soaked in the heat-conducting oil to the melting point of the solder to obtain the superconducting stacked tape to be separated; A superconducting single tape separation mechanism for separating the superconducting single tape from the superconducting stacked tape to be separated; An acquisition mechanism for concentrating the separated superconducting single tapes for degreasing and cleaning, and reflowing them to scrape the tin layer flat to obtain the superconducting single tapes to be tested; A strip Ic testing module for performing strip Ic testing on the superconducting single tapes to be tested to obtain the superconducting single tapes that pass the test; A screening, cutting and removing mechanism for screening the superconducting single tapes that pass the test, cutting and removing the completely failed superconducting single tapes to realize the recycling and reuse of the superconducting tape.

6. The recycling device for high-temperature superconducting tapes according to claim 5, characterized in that, The auxiliary tooling is stacked in sequence along the direction of tin shedding: A heightening strip for supporting the skeleton of the superconducting magnet, forming a natural dropping space for the superconducting stacked tape after the tin melts, and also forming a channel for the tin between the superconducting tapes in the superconducting stacked tape to drop off after melting; A tin leakage net for accommodating the superconducting stacked tape that naturally drops after the tin melts; A tin receiving box for collecting the tin that drops off after melting, and also for containing the heat-conducting oil to soak the superconducting stacked tape after the first heating.

7. The recycling device for high-temperature superconducting tapes according to claim 5, characterized in that, The superconducting single tape separation mechanism includes a tin remover, an automatic collection tray, and an imitation turn track, and both the tin remover and the automatic collection tray are movably connected to the imitation turn track. Among them, The tin remover is dragged by a first motor to travel, and is used to blow off the residual tin on the surface of the superconducting tape in the superconducting stacked tape to be separated; The automatic collection tray is dragged by a second motor to travel, and is used to automatically collect one superconducting single tape from the superconducting tapes with the surface residual tin blown off, and make it travel slowly along the imitation turn track to achieve separation.

8. The recycling device for high-temperature superconducting tapes according to claim 7, characterized in that, The first motor is a servo motor or a stepper motor, and the second motor is a servo motor or a stepper motor.

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