A system for recycling recycled carbon fiber

Abstract

The invention discloses a system for recycling regenerated carbon fiber, which relates to the field of carbon fiber recycling technology, including a thermal decomposition chamber and a thermal decomposition reactor, wherein a microwave device is installed on the thermal decomposition chamber, a dry distillation gas delivery device is installed on one side of the thermal decomposition chamber, and a thermal decomposition reactor is installed inside the thermal decomposition chamber. The RCF recycled by the recycling system of removing the stitch of CF stitch scrap generated in the poor CF (carbon fiber) production process and recycling the RCF and the recycling system of recycling waste carbon fiber reinforced plastic (CFRP: Carbon Fiber Reinforced Plastics) RCF belongs to an environmental protection technology with almost no change in tensile strength, almost no foreign matter on the surface, and less fiber damage. The heat energy after the exhaust gas is burned is recycled into the box body for heating, forming a closed loop, reducing emissions, and compared with the previous thermal decomposition and chemical recycling, it belongs to a system with low process cost and no secondary waste generation.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber recycling, and in particular to a system for recycling regenerated carbon fiber. Background Art

[0002] Some people confuse carbon fiber and CFRP. CFRP is a composite material made of carbon fiber woven fabric and is a type of FRP. CF (carbon fiber) is fiber, and CFRP is plastic (plastic is a composite of carbon fiber and other materials). Since the main use of CF is to make CFRP, it is often used as a synonym. However, in addition to CFRP, CF is also used as a fabric to make protective clothing, to make ultra-small electrodes or flexible thermal conductors, so it is wrong to think that carbon fiber = CFRP.

[0003] Carbon Fiber is a fiber composed of a large number of carbon atoms forming a crystal structure and arranged into long molecular chains. The fiber diameter is extremely thin, about 10μm, but it has high tensile strength and rigidity, good high temperature and chemical resistance, and small thermal expansion. Therefore, this material is widely used in aircraft, automobiles, tobacco filters, various sports, etc. In particular, it is widely used in carbon fiber reinforced polymers (CFRP) made of polymers (plastics) when mixed with resins such as epoxy resins.

[0004] CFRP (Carbon Fiber Reinforced Plastics) is the abbreviation of carbon fiber reinforced plastics, which is a composite material that uses carbon fiber as a reinforcement material. This composite material has many characteristics, namely high rigidity or high strength, electrical conductivity, heat resistance, low thermal expansion coefficient, magnetic lubricity, and X-ray transmittance. Based on these characteristics, CFRP can be used in a wide range of applications such as aerospace, automobiles, motorcycles, sports, medical care, and construction. The biggest feature of CFRP is "lightweight and high strength."

[0005] Compared with existing metal materials, it is lightweight and has very high strength and rigidity, so it is very convenient in the aerospace industry and racing cars, which value performance. In addition, it has high corrosion resistance, high fatigue strength and excellent chemical resistance, and is recognized as a highly reliable material that can be used in various environments. In addition, CFRP has the characteristics of anisotropic materials, and its rigidity and strength can be adjusted by changing the orientation direction of the fibers and the type of material. It is lighter than aluminum and can achieve rigidity higher than iron depending on the direction. CFRP can achieve the following situations: manufacturing parts with shapes that are difficult to achieve with metals, or designing multiple metal parts into an integrated shape. However, when CFRP is used for a long time in the field, it is sometimes necessary to paint or plate it to prevent material deterioration, so the material or surface treatment should be selected according to the use environment. By understanding and appropriately utilizing these characteristics, the value of CFRP in many fields can be maximized.

[0006] The importance of recycling CFRP (Carbon Fiber Reinforced Plastics) is a topic of concern in modern sustainability discussions. CFRP is widely used due to its excellent physical properties, but its production and disposal will bring a huge burden to the environment. In the context of emphasizing recycling, there are two major factors: environmental protection and sustainable resource management.

[0007] -Necessity of recycling (LCA perspective) In fact, the recycling and reuse of CFRP faces many issues. Technical difficulties or cost issues become the main barriers, requiring the establishment of efficient recycling and reuse processes. Since the carbon fibers that make up CFRP are expensive to manufacture and use a large amount of non-renewable resources, the effective use of these fibers is also economically important. And if the used CFRP products are not properly handled, these may become a serious burden on the environment. This includes the risk of increased waste or leakage of harmful substances from discarded CFRP. Therefore, the recycling and reuse of CFRP is crucial to minimize the environmental impact of these materials and promote sustainable use.

[0008] As we all know, the production of carbon fiber requires huge amounts of energy (especially electricity). It takes 290 MJ of energy to produce 1 kgf of PAN-based carbon fiber. 5). The Carbon Fiber Association built a pilot plant for RCF production in Omuta City, Fukuoka Prefecture as a NEDO project in 2006 (supplementary research continued through construction in Fukuoka Prefecture from 2009 to 2012). The project recovered milled carbon fibers by thermal decomposition and verified the energy required to obtain RCF and the reduction effect of CO2 emissions. The results are shown in Table 1. Based on this, even for the same milled carbon fiber, RCF can reduce the energy required for production by 83% compared to the first production of the material.

[0009] The Carbon Fiber Association website (http: / / www.carbonfiber.gr.jp / tech / lca.html) shows the LCA results when CFRP is used in the main structural members of a passenger car. In this case, even if it is driven for about 2 years (9,400 km / year x 2 years), it is still superior to existing vehicles.

[0010] However, the yield of CFRP or even CF is not stated. It is reported that the yield of CFRP used in aircraft is 50%. If the proportion of carbon fiber manufacturers is taken into account, it will be lower. It is believed that automobile production does not require high quality like aircraft. In addition, high-yield carbon fiber molding methods such as SMC (Sheet Molding Compound) and RTM (Resin Transfer Molding) have been introduced, but even if this is taken into account, the current comprehensive yield of carbon fiber cannot reach that of steel. In addition, the base material resin of CFRP needs to be burned when it is discarded, but this does not seem to be taken into account. Even if this is taken into account, fortunately, cars using CFRP as LCA are expected to reduce CO2 emissions to less than existing vehicles in 3~4 years. Considering the above fact (RCF manufacturing energy is extremely small), it is worth actively using CFRP / CFRTP using RCF while contributing to the lightweighting of cars. On the other hand, in terms of general industrial machinery, it is difficult to explain the profit of using CFRP from the perspective of LCA. In addition, since there is no large amount of CFRP that is discarded regularly (at a location), it is difficult to become a raw material supply source for RCF in the short term as a commercial basis.

[0011] - Recycling, another invisible reason (non-burning carbon fiber) In addition to the above explanation, there are other reasons for using RCF. According to the Carbon Fiber Association, "Carbon fibers (including CFRP and CFRTP) are properly handled as industrial waste (waste plastics)." And "they are not burned." Carbon fibers cannot be completely burned in ordinary combustible waste incinerators. The short fibers (fly) left after burning in an incinerator equipped with an electric vacuum cleaner will cause electrical short circuit accidents. In fact, they can only be disposed of in landfills. Regarding the disposal of CFRP and CFRTP, it is expected that countries around the world including the EU will provide relief, and Japan will sooner or later be unable to landfill. Therefore, there is no way to deal with the discarded CFRP except burning, but it is a headache because carbon fibers do not burn. In a very high temperature oxygen atmosphere, it is impossible to burn carbon fibers in a short time (not instantaneously). In ordinary waste incinerators, only the base material and sizing agent of CFRP disappear, and most of the carbon fibers remain and may fly into the air. As it happens, there is no efficient way to collect the scattered carbon fibers. Although it is currently believed that CFRP waste is not included in ordinary garbage except for a small amount of CFRP waste used by individuals such as golf clubs and tennis rackets, since carbon fiber does not burn, it is necessary to manage all CFRP waste for recycling and reuse.

[0012] -Recycled carbon fiber resources The raw materials of RCF are not just discarded CFRP. Carbon fiber fabric short materials (chips) are also "waste" that needs to be recycled and reused. Short fiber materials and fabric short materials are also a new type of carbon fiber. However, because they are short, their uses are limited and they cannot be mass-produced in the market. It is reported that many companies have discarded items due to accidents such as cargo collapse and flooding. In addition, there are many non-standard products that have no performance problems when used as FRTP reinforcement materials for injection molding, but there is nothing we can get. Waste CFRP and prepreg will become the raw materials of so-called RCF.

[0013] - Environmental impact and the advantages of recycling In fact, there are many issues facing the recycling of CFRP. If the technology for recycling CFRP is successful, many environmental benefits can be achieved. Reducing waste can reduce the pressure on landfills, thereby reducing the risk of environmental pollution. In addition, recycled carbon fiber can be reused in the manufacture of new products, making effective use of resources. This is very important from the perspective of sustainable use of limited resources. In addition, new jobs can be created through the recycling process, which can generate economic benefits. By reducing the impact on the environment and creating new business opportunities, CFRP recycling will be an important factor in contributing to sustainable development.

[0014] -Existing CFRP recycling methods Regarding waste CFRP, the most efficient way to recycle RCF at low cost will be pyrolysis. Japan has found that if the appropriate temperature condition of 500°C is set, the fully usable CF can be recovered by about 25% with the modulus unchanged and the strength decreased.

[0015] Another carbon fiber recycling method (thermal decomposition of resin) is a method using superheated steam (SHS). SHS can stably promote the decomposition of epoxy matrix by CFRP. The epoxy matrix of CFRP can be decomposed at 500°C in about 15 minutes. If there is about 10% oxygen, the resin is more easily decomposed. Unlike combustion-type thermal decomposition treatment, it is easy to control the treatment temperature and oxygen concentration in SHS. In addition, compared with thermal decomposition, the epoxy matrix can be decomposed quickly at a relatively low temperature. It is well known in Japan that the strength deviation of RCF obtained by SHS treatment is small and the average value is also high.

[0016] Japan has confirmed that after adding N2-4% and CO2 for treatment in a 500ºC environment, it can be restored to a long fiber state, and the fiber surface modification (improved adhesion to the resin) and tensile strength are significantly improved.

[0017] In order to recover the fibers while maintaining the fiber orientation of waste CFRP, Japan's JFCC dissolves the water from the superheated steam generator into the ion exchange water generator, and uses a heater on a high-frequency power supply to maintain 800 degrees of 100-degree steam and N2, CO2, O2, etc. passing through the boiler to thermally decompose the CFRP.

[0018] There are three common methods for recycling CFRP (carbon fiber reinforced plastic): ① Thermal decomposition method ②Chemical decomposition method ③ Mechanical decomposition method These methods have their own advantages and disadvantages, and the efficiency of recycling and its impact on the environment must be considered.

[0019] ① Thermal decomposition method The thermal decomposition method is a method of heating CFRP to a high temperature to separate carbon fiber and resin. This method can recover high-quality carbon fiber without destroying the physical properties of the fiber, and is suitable for reuse. However, the thermal decomposition method requires high temperatures (generally above 450°C), and the resulting high energy consumption is the biggest issue. Specialized equipment is also required, such as a dedicated reactor and control system. Therefore, the thermal decomposition method requires a large investment in equipment and is generally used in large facilities. In addition, the impact of high-temperature treatment on the environment needs to be considered, and energy efficiency needs to be improved or waste gas treatment technology needs to be developed.

[0020] ②Chemical decomposition method The chemical decomposition method is a method of using certain chemicals to dissolve the resin component in CFRP and separate the carbon fibers. Since this method can be carried out at a relatively low temperature, it has the advantage of good energy efficiency compared to the thermal decomposition method. In addition, the use of certain solvents can effectively remove the resin and maintain the quality of the fiber. However, the use of chemicals still has great challenges and has a great impact on the environment. The chemicals used are often harmful and their handling or disposal must be strictly managed. In addition, since the chemical decomposition method is only applicable to certain types of CFRP, it may not be applicable to the recycling and reuse of a wide range of CFRP types, so caution is required.

[0021] ③ Mechanical decomposition method Mechanical decomposition is a method of using physical forces to decompose CFRP and recover fibers. This method is relatively simple and can be implemented at low cost. CFRP is broken down into small pieces by machinery such as pulverizers or crushers, and the fibers are separated in the later process. However, this method may reduce the quality of the fibers, especially considering the impact on the length or strength of the fibers. Therefore, fibers recovered by mechanical decomposition may be difficult to reuse in products with performance equivalent to the original use. This method is suitable for processing relatively large amounts of waste and can also be introduced in small facilities, but the huge issue is that it limits the scope of use of recycled and reused fibers.

[0022] lInnovative recycling and reuse methods In the field of CFRP (carbon fiber reinforced plastic) recycling, new technologies are being developed that are more efficient and environmentally friendly than traditional methods. Two innovative recycling methods are particularly noteworthy, namely microwave recycling and electrolytic sulfuric acid.

[0023] ①CFRP recycling using microwaves CFRP recycling using microwaves is a relatively new technology that can efficiently degrade the resin in CFRP and recover high-quality carbon fibers. The biggest advantage of this method is that microwaves cause less damage to the fibers during the process of heating and decomposing the resin. The recycled carbon fibers maintain high quality when reused to manufacture new products. In addition, the use of microwaves shortens the heating time and reduces energy consumption. Compared with the previous high-temperature decomposition method, this not only reduces environmental impact, but also helps reduce costs, so it has attracted much attention.

[0024] ② Electrolytic sulfuric acid method The electrolytic sulfuric acid method is a technology that electrolyzes sulfuric acid into diamond electrodes and uses the electrolytic sulfuric acid solution to decompose the resin in CFRP. This method can achieve efficient and environmentally friendly recycling and reuse by using diamond electrodes in particular. The biggest advantage of using diamond electrodes may be that they have high conductivity and chemical stability, which can greatly improve the efficiency of the electrolysis process. In addition, diamond electrodes have high durability and can be used for a long time, which can reduce the cost of the entire electrolytic sulfuric acid method. In the CFRP decomposed by this method, high-quality carbon fibers are efficiently recovered and the environmental load is also low, making a significant contribution to the construction of a sustainable recycling and reuse system.

[0025] - Commercial possibility The recycling of CFRP has gone beyond a simple environmental countermeasure and contains great potential for creating new business models. Recycled carbon fiber is expected to be reused in a variety of industries such as automobiles, aerospace, construction, and sporting goods by taking advantage of its high strength and lightness. This will not only reduce manufacturing costs and improve product performance, but also increase the possibility of the emergence of new markets. In addition, the recycling process itself has business value and can meet consumers' demands for environmentally friendly products.

[0026] -Future market and technological progress Advances in CFRP recycling technology will be a factor that will greatly expand the market in this area. The development of more efficient and cost-effective recycling methods has promoted the use of CFRP and enabled its application in a wider range of industries. This is expected to promote product price reductions and the development of new uses. In addition, technological advances will undoubtedly transform the recycling process into a more environmentally friendly recycling process, thereby helping to reduce carbon dioxide emissions. These changes can create new growth opportunities in the composite materials market, including CFRP, while minimizing the impact on the environment.

[0027] -Contribute to sustainable development Promoting CFRP recycling is an important step in achieving the Sustainable Development Goals (SDGs). The reduction of waste and the efficient reuse of resources can greatly reduce the environmental burden. This process helps to build a circular economy and make full use of limited resources. In addition, recycled carbon fiber will become a new driving force for promoting new product development and supporting economic growth. The development of CFRP recycling technology can inhibit the progress of global warming and help protect biodiversity. As mentioned above, CFRP recycling is expected to play a vital role and is the key to achieving a sustainable balance between the environment and the economy. Summary of the invention

[0028] The object of the present invention is to provide a system for recycling recycled carbon fibers.

[0029] The purpose of the present invention can be achieved through the following technical solutions: A system for recycling regenerated carbon fiber, comprising a thermal decomposition chamber and a thermal decomposition reactor, wherein a microwave device is installed on the thermal decomposition chamber, a dry distillation gas delivery device is installed on one side of the thermal decomposition chamber, and a thermal decomposition reactor is installed inside the thermal decomposition chamber; The thermal decomposition reactor comprises a tray, a lower cover is arranged on the top of the tray, a middle cover is arranged on the top of the lower cover, an upper cover is arranged on the top of the middle cover, and a pressure cover is installed inside the middle cover.

[0030] As a further solution of the present invention: a dry distillation gas outlet pipeline is provided between the middle cover and the upper cover.

[0031] As a further solution of the present invention: a pipeline for supplying HotN2 is connected to the side of the thermal decomposition reactor.

[0032] As a further solution of the present invention: a slide rail cooperating with a pulley at the bottom of the thermal decomposition reactor is arranged inside the thermal decomposition chamber.

[0033] As a further solution of the present invention: the interior of the thermal decomposition chamber is coated with a ceramic coating.

[0034] As a further solution of the present invention: the gland is made of a ceramic plate or a ceramic fiber cloth.

[0035] As a further solution of the present invention: the microwaves of the microwave device use a power within the range of 915-2450 MHz.

[0036] Beneficial effects of the present invention: The RCF recycled by the recycling system that removes the stitch of CF stitch scrap generated by the defective CF (carbon fiber) production process and recycles RCF and the recycling system that recycles waste carbon fiber reinforced plastics (CFRP: Carbon Fiber Reinforced Plastics) RCF has almost no change in tensile strength, almost no foreign matter on the surface, and less fiber damage. It is an environmentally friendly technology that can recycle the heat energy after the exhaust gas is burned into the box for heating, forming a closed loop and reducing emissions. Compared with the previous thermal decomposition and chemical recycling, it is a system with low process costs and no secondary waste generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2It is a schematic diagram of the overall structure of the thermal decomposition reactor of the present invention; Figure 3 It is a schematic diagram of nano-ion cooling water generated by the electromagnetic field modification device of the present invention.

[0039] In the figure: 1. microwave device; 2. thermal decomposition chamber; 3. thermal decomposition reactor; 4. dry distillation gas delivery device; 31. tray; 32. lower cover; 33. middle cover; 34. pressure cover; 35. upper cover. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments 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.

[0041] See also Figure 1-2 As shown, the present invention is a system for recycling regenerated carbon fiber, which recycles the heat energy after the exhaust gas is burned into the box body for heating, forming a closed loop to reduce emissions, including a thermal decomposition chamber 2 and a thermal decomposition reactor 3. A microwave device 1 is installed on the thermal decomposition chamber 2. Most products are composed of molecules. Microwaves enter the center of the product through waves, so that the "two ends" of the water molecules in the product are respectively positively charged and negatively charged. The electric field will make the positive charge ends of the water molecules point in the same direction. The positive and negative directions of the microwave electric field are switched 4.9 billion times per second. The water molecules also keep changing directions accordingly. As the water molecules continue to turn, they collide with each other, rub against each other and generate heat; a dry distillation gas conveying device 4 is installed on one side of the thermal decomposition chamber 2, and the gas generated in the thermal decomposition chamber is sucked into the dry distillation box by a self-suction fan and sprayed (the water is specially treated); the gas is allowed to settle, and if the gas cannot be treated, it is sucked into the adjacent box again for purification in the purified water. A thermal decomposition reactor 3 is installed inside the thermal decomposition chamber 2; the thermal decomposition reactor 3 includes a tray 31, a lower cover 32 is arranged on the top of the tray 31, a middle cover 33 is arranged on the top of the lower cover 32, an upper cover 35 is arranged on the top of the middle cover 33, and a pressure cover 34 is installed inside the middle cover 33. A dry distillation gas outlet pipeline is arranged between the middle cover 33 and the upper cover 35. A pipeline for supplying HotN2 is connected to the side of the thermal decomposition reactor 3. A slide rail that cooperates with the pulley at the bottom of the thermal decomposition reactor 3 is arranged inside the thermal decomposition chamber 2. The interior of the thermal decomposition chamber 2 is coated with a ceramic coating. The pressure cover 34 is made of a ceramic plate or a ceramic fiber cloth. The microwave of the microwave device 1 uses a power within the range of 915-2450 MHz.

[0042] 1. Input raw materials A. Cut the waste CFRP into appropriate sizes and fill them with the processing capacity that meets the microwave power before conducting the thermal decomposition reaction in the mobile thermal decomposition reactor.

[0043] B. Taking CF Stitch Scrap as an example, it is stacked layer by layer in the mobile thermal decomposition reactor and filled to the processing capacity that meets the microwave power before the thermal decomposition reaction.

[0044] During the process of filling CFRP or CF Stitch Scar into the thermal decomposition reactor, a dust suction device is installed to prevent CF from scattering and being inhaled by workers, creating a comfortable and clean working environment.

[0045] 2. Thermal decomposition reactor manufacturing process: The middle part of the thermal decomposition reactor adopts a cover made of ceramic fiber board or ceramic fiber cloth with a thin thickness of radiation coating.

[0046] The upper cover of the thermal decomposition reactor is also made of coated ceramic plate or ceramic fiber cloth material.

[0047] The inner material of the thermal decomposition reactor is STS 304, and the material wrapping it is the same as that of 4.A.

[0048] The thermal decomposition reactor consists of a structure that can be moved by a forklift.

[0049] In the thermal decomposition reactor, when the thermal decomposition carbonization gasification proceeds rapidly and generates pressure, the carbonization gas is designed to be discharged between the upper cover and the middle cover when the pressure is above a certain level.

[0050] The thermal decomposition reactor of the present invention is designed so that microwaves can be concentrated in the reactor, and the radiation coating and heat insulation prevent the interior of the thermal decomposition reactor from dissipating heat, thereby improving the thermal decomposition efficiency.

[0051] In order to improve the tensile strength of RCF, a pipeline can be connected to the side of the thermal decomposition reactor to supply HotN2. In order to remove foreign matter and improve the quality of RCF, high-temperature steam above 350 degrees can be provided for thermal decomposition.

[0052] Depending on the situation, the hydrogen, carbon monoxide, carbon dioxide and nitrogen of the water-coal gasification combustion furnace can be supplied at more than 500 degrees.

[0053] 3. Thermal decomposition chamber A. The interior of the thermal decomposition chamber is coated with ceramic, a special coating with corrosion resistance, chemical resistance, and dust resistance.

[0054] B. The interlining of the thermal decomposition chamber is finished with insulation materials below 1000 degrees.

[0055] C. The out shell of the thermal decomposition chamber is finished with SUS304. The front is composed of two perspective mirrors, and the outer perspective mirror is a screen that shields electromagnetic waves.

[0056] D. In addition, a pyrolysis reactor structure with a track installed on the triangular tube formed in the pyrolysis chamber can transfer the pyrolysis reactor.

[0057] E. Construct a shielded pipeline so that the distillation gas generated in the thermal decomposition reactor can be transported through the distillation gas transport device at a minimum negative pressure.

[0058] 4. Microwave A. Microwaves use power in the range of 915~2450MHz.

[0059] Using nano-ion cooling water generated by electromagnetic field modification device (such as Figure 3 A cooling device for cooling the heat generated by the microwave device (as shown).

[0060] 5. Principle of thermal decomposition D. As we all know, microwave thermal decomposition is heated by frictional heat under vacuum conditions.

[0061] E. As we all know, only the surface generates heat due to friction due to the dielectric constant.

[0062] F. The heating rate of CF and CFRP is determined by the dielectric constant of microwaves, density and thickness of raw materials, size and particles, etc.

[0063] G. The technology of the present invention is a method of limiting the heat generated by microwaves in a thermal decomposition reaction furnace, and the method maximizes the insulation effect through a ceramic radiation coating to achieve a rapid temperature rise effect.

[0064] H. Microwave electromagnetic waves enter one side of CF or CFRP and are finally released to generate heat. Since the raw materials are CF and CFRP with excellent conductivity, they are not released last, but are characterized by the conductivity that allows the whole to transfer heat at the same time.

[0065] I. In this case, the generated carbonization gas increases sharply, passes through the upper cover, absorbs electromagnetic waves, and cannot be fully transmitted to the thermal decomposition reactor, resulting in interruption of thermal decomposition. To cope with this situation, a carbonization gas outlet pipe is provided between the middle cover and the upper cover, and a kettle-shaped cover is provided at the end of the pipe, and the gas is discharged by gravity.

[0066] J. Regarding CFRP, epoxy sizing and adhesive are heated by microwave transfer and then retorted into gaseous state to become de-sizing RCF.

[0067] K. Regarding CF Stitch, Stitch is retorted and gasified and CF sizing epoxy is in the retorted and gasified state to become de-sizing RCF.

[0068] L. At this time, the feature is that there is almost no foreign matter in the RCF, and the tensile strength is maintained at a level similar to that of new materials.

[0069] M. At this time, the thermal decomposition temperature is between 420 and 800 degrees.

[0070] N. Its characteristic is that after the thermal decomposition reaction of CFRP and CF stitch is completed, the HotN2 available afterwards is supplied to the thermal decomposition reactor to improve the physical properties of RCF.

[0071] O. Its characteristics are: it can mix and supply high-temperature steam to Hot N2 to improve the physical properties of RCF.

[0072] 6. Transporting distillation gas P. The dry distillation gas generated in the thermal decomposition chamber is transported to the liquid collector neutralization device through two equipped dry distillation gas transport devices.

[0073] Q. The pyrolysis gas delivery device injects N2 or Air into the exhaust pipe of the pyrolysis pyrolysis gas, which not only dilutes the concentration of toxic gas, but also extracts the gas and liquid remaining in the pipe through a powerful suction power, which can improve equipment and environmental safety issues such as preventing pipe corrosion.

[0074] R. Its characteristics are: supplying N2 or Air to make the delivery temperature of the distillation gas reach below 60 degrees.

[0075] S. The innovative design structure combines the Venturi effect and the Bernoulli principle. It is a device with at least 30~40mmH20 strong suction force (vacuum) and exhaust discharge capacity, which increases the [Suction pressure] by more than 80mmH20.

[0076] Bernoulli's Principle: In the multiple holes around the inside of the pipe, high-speed air or N2 is injected along the funnel-shaped inclined surface, and a vacuum is formed around the high-speed N2, which is quickly sucked in and transported at a speed of about 15 times the amount of N2 injected. Venturi effect (funnel): E. The high-speed N2 jet flows faster as the inner diameter of the pipe decreases, forming a conical N2 curtain that is powerfully ejected in the exhaust direction. A strong air pocket is formed at the front end of the N2 curtain, which strongly sucks in the exhaust of the pump and creates a vacuum state.

[0077] The working principle of the present invention:.

[0078] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A system for recycling recycled carbon fiber, characterized in that: It comprises a thermal decomposition chamber (2) and a thermal decomposition reactor (3), wherein a microwave device (1) is installed on the thermal decomposition chamber (2), a dry distillation gas delivery device (4) is installed on one side of the thermal decomposition chamber (2), and a thermal decomposition reactor (3) is installed inside the thermal decomposition chamber (2); The thermal decomposition reactor (3) comprises a tray (31), a lower cover (32) is arranged on the top of the tray (31), a middle cover (33) is arranged on the top of the lower cover (32), an upper cover (35) is arranged on the top of the middle cover (33), and a pressure cover (34) is installed inside the middle cover (33).

2. A system for recycling regenerated carbon fiber according to claim 1, characterized in that: A dry distillation gas outlet pipeline is provided between the middle cover (33) and the upper cover (35).

3. A system for recycling regenerated carbon fiber according to claim 1, characterized in that: The side of the thermal decomposition reactor (3) is connected to a pipeline for supplying HotN2.

4. A system for recycling regenerated carbon fiber according to claim 1, characterized in that: The interior of the thermal decomposition chamber (2) is provided with a slide rail which cooperates with a pulley at the bottom of the thermal decomposition reactor (3).

5. The system for recycling regenerated carbon fiber according to claim 1, characterized in that: The interior of the thermal decomposition chamber (2) is coated with a ceramic coating.

6. A system for recycling regenerated carbon fiber according to claim 1, characterized in that: The gland (34) is made of ceramic fiber board or ceramic fiber cotton.

7. The system for recycling regenerated carbon fiber according to claim 1, characterized in that: The microwaves of the microwave device (1) use a power within the range of 915 to 2450 MHz.

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