Pyrolysis stripping integrated device and system for recycling carbon fiber materials

Abstract

The application provides a pyrolysis stripping integrated device and system for recycling carbon fiber materials, wherein the device comprises an outer cylinder and an inner cylinder, a plurality of movable protrusions are embedded in the outer peripheral wall of the inner cylinder, and the inner cylinder is provided with a gas guide chamber at the first end portion; the inner cylinder is rotatably installed in the inner portion of the outer cylinder through a first rotating shaft and a second rotating shaft, the inner portion of the first rotating shaft is hollow to guide the heating gas into the gas guide chamber; a gas outlet is formed in the side wall of the gas guide chamber, the outer cylinder is provided with a feeding port, a discharging port and an exhaust port, the feeding port is close to the gas outlet, and the discharging port and the exhaust port are both away from the gas outlet. The device can effectively crush different types of carbon fiber composite materials, the crushing granularity is uniform, the structure is simple, the operation is convenient, and the maintenance cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber material recycling, and particularly relates to a pyrolysis stripping integrated device and system for recycling carbon fiber material. BACKGROUND

[0002] Carbon fiber composite material, as a new type of composite material, has excellent mechanical properties and is widely used in various fields. At the same time, harmless and resourceful disposal of a large amount of processing scraps and scrap materials will become a great opportunity and challenge.

[0003] The existing technologies for recycling carbon fiber composite material mainly include mechanical recycling method, thermal treatment method and chemical recycling method. The mechanical recycling method is to cut and crush the waste composite material into small size fragments or powder through physical methods such as cutting and rolling, and then to screen, filter and collect the powder rich in matrix resin and short fiber product. This method is simple in processing and low in cost, but it will cause carbon fiber fracture and damage, and the recycled material can only be used as filler or aggregate of short fiber composite material. The thermal treatment method is to degrade the waste composite material at high temperature to decompose the thermosetting resin into oil, gas and a small amount of solid product by using the high temperature resistance of the reinforcing fiber. This recycling method can recycle the resin matrix and reinforcing fiber at the same time, and the solid residue is inorganic filler, reinforcing fiber and a small amount of residual carbon. This method can maintain the shape and length of carbon fiber, but it will cause the formation of pyrolytic carbon or excessive oxidation on the surface of carbon fiber, which will reduce the strength and stiffness of carbon fiber and affect the performance and reutilization performance of carbon fiber. The chemical recycling method is to dissolve or decompose the resin matrix in the waste composite material by using solvent or electrochemical method, so as to separate the high value carbon fiber. This recycling method can maintain the integrity and mechanical properties of carbon fiber, but it will consume a large amount of energy and chemical reagents, and produce harmful waste liquid. SUMMARY

[0004] The present application provides a pyrolysis stripping integrated device and system for recycling carbon fiber material, which solves the defect that the existing recycling process cannot simultaneously consider the mechanical properties, integrity and economy of carbon fiber, and realizes effective recycling of carbon fiber material.

[0005] The application provides a pyrolysis stripping integrated device for recycling carbon fiber materials, which comprises an outer cylinder and an inner cylinder, a plurality of movable protrusions are embedded in the outer peripheral wall of the inner cylinder, and a gas guide chamber is arranged at the first end of the inner cylinder; the inner cylinder is rotatably arranged in the inner part of the outer cylinder through a first rotating shaft and a second rotating shaft, the inner part of the first rotating shaft is hollow to guide the heated gas into the gas guide chamber; a gas outlet is arranged on the side wall of the gas guide chamber, and a feeding port, a discharging port and an exhaust port are arranged on the outer cylinder, the feeding port is close to the gas outlet, and the discharging port and the exhaust port are away from the gas outlet.

[0006] According to the pyrolysis stripping integrated device for recycling carbon fiber materials, the outer peripheral wall of the inner cylinder is provided with a plurality of protrusion mounting positions, and a rolling body is embedded in each protrusion mounting position; the top end of the rolling body protrudes out of the protrusion mounting position to roll against the carbon fiber material to be recycled.

[0007] According to the pyrolysis stripping integrated device for recycling carbon fiber materials, the rolling body comprises a rolling ball, a cylindrical roller and a conical roller.

[0008] According to the pyrolysis stripping integrated device for recycling carbon fiber materials, the gas outlet, the discharging port and the exhaust port are all provided with a filter screen.

[0009] According to the pyrolysis stripping integrated device for recycling carbon fiber materials, the inner part of the inner cylinder is hollow and provided with a partition plate to divide the gas guide chamber; the end face of the partition plate towards the first rotating shaft protrudes outwards, and the protruding size gradually decreases along the radial direction.

[0010] According to the pyrolysis stripping integrated device for recycling carbon fiber materials, the distance between the outer wall of the inner cylinder and the inner wall of the outer cylinder gradually decreases along the direction away from the first rotating shaft.

[0011] According to the pyrolysis stripping integrated device for recycling carbon fiber materials, a heating assembly is arranged on the side wall of the inner cylinder, an electric slip ring is arranged on the second rotating shaft, and the heating assembly is electrically connected to the electric slip ring.

[0012] The application further provides a pyrolysis and stripping integrated system for recycling carbon fiber materials, comprising the pyrolysis and stripping integrated device as described above, and further comprising a gas conveying device, a gas heating device, a driving mechanism, a feeding device and a discharging device, the gas outlet of the gas conveying device is connected to the gas inlet of the gas heating device, the gas outlet of the gas heating device is connected to the first rotating shaft of the pyrolysis and stripping integrated device, the driving mechanism is connected to the second rotating shaft of the pyrolysis and stripping integrated device, the feeding device is connected to the feeding port of the pyrolysis and stripping integrated device, and the discharging device is connected to the discharging port of the pyrolysis and stripping integrated device.

[0013] According to the application, the feeding device of the pyrolysis and stripping integrated system for recycling carbon fiber materials comprises a feeding tank, the discharging port of the feeding tank is connected to the feeding port of the pyrolysis and stripping integrated device through a feeding pipe, and the discharging port is provided with a discharging gate mechanism.

[0014] According to the application, the pyrolysis and stripping integrated system for recycling carbon fiber materials further comprises a tail gas treatment device, the gas inlet of the tail gas treatment device is connected to the exhaust port of the pyrolysis and stripping integrated device, and the gas outlet of the tail gas treatment device is connected to the gas inlet of the gas conveying device.

[0015] The pyrolysis and stripping integrated device and system for recycling carbon fiber materials provided by the application forms a working chamber in the gap between the inner cylinder and the outer cylinder, the working chamber is filled with heated gas in the gas guide chamber, the carbon fiber material to be recycled is subjected to high-temperature pyrolysis, the bonding force between the carbon fiber layers is weakened, the resin matrix is separated from the carbon fiber, the rotating motion of the inner cylinder is simultaneously utilized, the movable protrusions on the outer peripheral wall of the inner cylinder are used to extrude the carbon fiber material, the carbon fiber material is caused to slip and separate, and the carbon fiber with high added value is stripped off; the separated solid-phase carbon fiber material is discharged through the discharging port, and the pyrolysis waste gas is discharged through the exhaust port. The integrated device and system combines the pyrolysis process and the mechanical stripping process, can simultaneously perform high-temperature pyrolysis and layer separation on the carbon fiber, causes the carbon fiber material to pyrolyze or volatilize the resin matrix in rolling, separates the resin matrix from the carbon fiber while avoiding damage to the carbon fiber, can more greatly ensure the original structure and mechanical properties of the carbon fiber, saves the carbon fiber with high added value, further applies radial pressure to the carbon fiber through the rolling of the cylinder wall and the movable protrusions, reduces the damage of the carbon fiber caused by tangential abrasion, and can effectively improve the recycling efficiency and recycling quality of the carbon fiber composite material. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0017] Figure 1 is a structural schematic diagram of a pyrolysis-stripping integrated device for recycling carbon fiber material provided by the present application;

[0018] Figure 2 is Figure 1 a sectional view of the pyrolysis-stripping integrated device of

[0019] Figure 3 is Figure 2 a partial enlarged view of I in

[0020] Figure 4 is Figure 2 a partial enlarged view of the upper half of the pyrolysis-stripping integrated device in

[0021] Figure 5 is Figure 2 a partial enlarged view of the electric slip ring in

[0022] Figure 6 is a structural schematic diagram of a pyrolysis-stripping integrated system for recycling carbon fiber material provided by the present application;

[0023] Figure 7 is Figure 6 a side view of the integrated system in

[0024] Figure 8 is a structural schematic diagram of a feeding device provided by the present application;

[0025] Figure 9 is Figure 8 a sectional view of the feeding device in

[0026] Figure 10 is a structural schematic diagram of a discharging device provided by the present application;

[0027] Figure 11 is Figure 10 a sectional view of the discharging device in

[0028] Reference signs:

[0029] 1: outer cylinder; 11: feeding port; 12: discharging port; 13: exhaust port; 2: inner cylinder; 21: gas guiding chamber; 22: partition plate; 23: gas outlet; 3: movable protrusion; 31: protrusion mounting position; 32: rolling body; 33: packing ring; 41: first rotating shaft; 42: second rotating shaft; 51: first bearing seat; 52: second bearing seat; 6: filter screen; 7: heating assembly; 8: electric slip ring; 81: rotor; 82: contact brush; 9: electric cable;

[0030] 100: pyrolysis stripping integrated device; 200: feeding device; 210: feeding tank; 211: discharging port; 212: feeding gate; 220: feeding pipe; 221: visual window; 230: discharging gate mechanism; 300: discharging device; 310: discharging pipe; 320: discharging tank; 330: discharging gate mechanism; 400: gas conveying device; 500: gas heating device; 600: driving mechanism; 610: driving motor; 620: turbine reducer; 700: belt transmission mechanism; 800: shaft coupling; 900: safety valve. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] As shown in Figure 1 and Figure 2 , the pyrolysis stripping integrated device 100 for recycling carbon fiber material provided by the embodiments of the present application comprises an outer cylinder 1 and an inner cylinder 2, the outer peripheral wall of the inner cylinder 2 is embedded with a plurality of movable protrusions 3, and the inner cylinder 2 is provided with a gas guiding chamber 21 at the first end. The inner cylinder 2 is rotatably installed in the inner part of the outer cylinder 1 through a first rotating shaft 41 and a second rotating shaft 42, the inside of the first rotating shaft 41 is hollow to guide the heating gas into the gas guiding chamber 21. The side wall of the gas guiding chamber 21 is provided with a gas outlet 23, the outer cylinder 1 is provided with a feeding port 11, a discharging port 12 and an exhaust port 13, the feeding port 11 is close to the gas outlet 23, and the discharging port 12 and the exhaust port 13 are both away from the gas outlet 23.

[0033] Specifically, the outer cylinder 1 and the inner cylinder 2 are coaxially sleeved, and the outer cylinder 1 and the inner cylinder 2 can adopt one or a combination of a cylinder, a cone or an ellipsoid, as long as a gap is formed between the outer cylinder 1 and the inner cylinder 2 for the carbon fiber material to be recycled to pass through. The annular space formed between the outer cylinder 1 and the inner cylinder 2 constitutes a working chamber for pyrolysis and stripping of the carbon fiber material. The inner cylinder 2 is rotatably connected to the outer cylinder 1 through the first rotating shaft 41 and the second rotating shaft 42 at both ends, and the outer cylinder 1 can be fixed on the mounting frame, and the first bearing seat 51 and the second bearing seat 52 can also be fixed on the mounting frame. The first rotating shaft 41 and the second rotating shaft 42 are respectively installed in the first bearing seat 51 and the second bearing seat 52 through bearings, so as to ensure that the inner cylinder 2 stably rotates relative to the outer cylinder 1.

[0034] The inner cylinder 2 is provided with a hollow air guide chamber 21 at one end close to the first rotating shaft 41. The air guide chamber 21 is provided with an air guide opening at the end portion facing the first rotating shaft 41, and the end portion away from the first rotating shaft 41 is a closed end face. The side wall of the air guide chamber 21 is provided with an air outlet 23. In some specific embodiments, the number of air outlets 23 is multiple, and they are uniformly distributed along the circumference of the air guide chamber 21. At the same time, the first rotating shaft 41 is a hollow shaft, and the hollow first rotating shaft 41 is in communication with the air guide chamber 21, so that the external high-temperature heating gas can be introduced into the air guide chamber 21, and then enter the working chamber between the outer cylinder 1 and the inner cylinder 2 through the air outlet 23 of the side wall of the air guide chamber 21, so as to pyrolyze the carbon fiber material at high temperature. The heating gas can be an inert carrier gas, such as nitrogen, argon, carbon dioxide, etc. Before the device is put into use, the working chamber can also be purged and preheated with the heating gas to reduce the oxygen content, so as to pyrolyze the carbon fiber composite material at high temperature under oxygen-free or low-oxygen conditions.

[0035] In some specific embodiments, the pyrolysis temperature can be between 400℃ and 600℃, and the specific temperature can be determined according to the type of resin matrix of the carbon fiber material. The main function of high-temperature pyrolysis here is to decompose the resin matrix into small molecular gas products. Then, the gaseous products of pyrolysis are discharged in time from the exhaust port 13, combined with the continuous rotating motion of the inner cylinder 2, to ensure that the carbon fiber material in the working chamber is always uniformly heated, so that the resin matrix can be fully decomposed, and no pyrolysis residue is left on the surface of the recycled carbon fiber, thereby improving the material recycling quality. In addition, the heating gas flowing from the air outlet 23 to the exhaust port 13 can also play the role of pneumatic propulsion for the carbon fiber material in the working chamber, avoiding the accumulation and blockage of the carbon fiber material in the working chamber.

[0036] In addition, as Figure 2 and Figure 4As shown, a plurality of movable protrusions 3 are embedded in the outer peripheral wall of the inner cylinder 2. When the carbon fiber material is rolled and extruded in the working chamber, the movable protrusions 3 will also roll, avoiding tangential friction on the carbon fiber material and reducing the wear of the carbon fiber material due to the limited tangential activity.

[0037] The outer cylinder 1 is provided with a feed inlet 11, a discharge outlet 12 and an exhaust port 13. The feed inlet 11 is close to the exhaust port 23 and located in the upper half of the outer cylinder 1, which is convenient for the carbon fiber material to fall into the working chamber. The discharge outlet 12 and the exhaust port 13 are both away from the exhaust port 23. The discharge outlet 12 is located at the bottom end of the lower part of the outer cylinder 1, which is conducive to the discharge of the carbon fiber material. The exhaust port 13 is located at the top end of the upper part of the outer cylinder 1, which is conducive to the discharge of the pyrolysis gas.

[0038] Considering the relative rotation of the outer cylinder 1 and the inner cylinder 2, and the need to fill a large amount of gas in the working chamber and have a large pressure difference with the outside to generate axial pressure, a mechanical seal is used to ensure the air tightness of the device. The mechanical seal mainly uses the contact pressure and liquid film pressure between the two relatively moving end faces to form a seal, which is suitable for high pressure, high speed and high temperature occasions. The advantages are small friction, low energy consumption, small leakage, small leakage in long period operation, small friction power consumption, only 10%~50% of the soft packing seal, the shaft or shaft sleeve is basically not damaged by friction, long maintenance period, automatic compensation after end face wear, good anti-vibration ability, not sensitive to the vibration, deflection of rotating shaft and the deflection of shaft to sealing cavity.

[0039] The pyrolysis and peeling integrated device 100 for recycling carbon fiber material provided by the embodiment forms a working chamber in the gap between the inner cylinder body 2 and the outer cylinder body 1. The carbon fiber material to be recycled is subjected to high-temperature pyrolysis by the heating gas entering the working chamber through the gas guide chamber 21, so that the binding force between the carbon fiber layers is weakened, the resin matrix is separated from the carbon fiber, and then the carbon fiber material is extruded by the movable protrusions 3 on the outer peripheral wall of the inner cylinder body 2 through the rotation of the inner cylinder body 2, so that the carbon fiber material is subjected to slip delamination, and finally the carbon fiber with high added value is peeled off. The separated solid-phase carbon fiber material is discharged through the discharge port 12, and the pyrolysis waste gas is discharged through the exhaust port 13. The integrated device and system combine the pyrolysis process and the mechanical peeling process, can simultaneously subject the carbon fiber to high-temperature pyrolysis and delamination peeling, make the carbon fiber material pyrolyze or volatilize the resin matrix in rolling, separate the resin matrix from the carbon fiber while avoiding the damage of the carbon fiber caused by tangential wear, can more greatly ensure the original structure and mechanical properties of the carbon fiber, save the carbon fiber with high added value, additionally, the carbon fiber is subjected to radial pressure by the cylinder wall rolling and the movable protrusions 3, reduces the damage of the carbon fiber caused by tangential wear, and can effectively improve the recycling efficiency and recycling quality of the carbon fiber composite material.

[0040] Further, as shown in Figure 2 and Figure 3 , the outer peripheral wall of the inner cylinder body 2 is provided with a plurality of protrusion mounting positions 31, and the protrusion mounting positions 31 are embedded with rolling bodies 32. The top end of the rolling body 32 protrudes out of the protrusion mounting position 31 to roll against the carbon fiber material to be recycled. Further, the rolling body 32 includes a rolling ball, a cylindrical roller, a conical roller and the like which can roll. As shown in Figure 3 , the rolling ball is taken as the rolling body 32 in the embodiment for example, and the protrusion mounting position 31 is a bowl-shaped hole opened in the outer wall of the inner cylinder body 2. Each bowl-shaped hole can correspondingly wrap one spherical rolling ball, and the rolling ball can freely rotate at any angle in the bowl-shaped hole. The opening size of the bowl-shaped hole towards the outer cylinder body 1 is slightly smaller than the diameter of the rolling ball, so that the top end of the rolling ball protrudes out of the bowl-shaped hole, and the bottom end of the rolling ball can be further installed with a packing ring 33, so that it is tightly fastened and does not fall off while still retaining the freedom of rotation. The packing ring 33 can adopt a high-temperature packing ring such as a graphite ring or an organic ring, which has good resilience, chemical stability and can provide effective sealing effect to prevent gas leakage in the working chamber.

[0041] In other embodiments, the rolling body 32 can also adopt a cylindrical roller or a conical roller, etc., which rolls in a rotating manner around a central axis that can be parallel to the rotating shaft of the inner cylinder 2 or forms a certain stagger angle, and the specific arrangement manner can be determined according to the properties of the carbon fiber material to be recycled, which is not limited here. In addition, the rolling body 32 needs to be rotatably embedded into the end of the rotating shaft in the protruding mounting position 31 during installation, and the protruding mounting position 31 can adopt a square or trapezoidal slot to be compatible with the cylindrical roller or the conical roller.

[0042] On the basis of the above embodiments, the movable protrusions 3 can be arranged in a circumferentially uniform and axially staggered manner on the outer peripheral wall of the inner cylinder 2, and can also be arranged in a spiral line along the surface of the outer peripheral wall to uniformly extrude the carbon fiber material and facilitate the discharge of the carbon fiber material.

[0043] Further, as shown in Figure 2 and Figure 4 , the gas outlet 23, the discharge outlet 12 and the exhaust outlet 13 are all installed with a filter screen 6. The pore size of the filter screen 6 at the gas outlet 23 can be generally larger than the size of the carbon fiber material to be recycled entering from the feeding port 11, which is mainly used to prevent the carbon fiber material from falling into the gas guiding chamber; the pore size of the filter screen 6 at the discharge outlet 12 can be generally determined according to the size of the carbon fiber to be recycled, so as to screen the recycled material with a composite size requirement; the pore size of the filter screen 6 at the exhaust outlet 13 is the smallest, which is mainly used to prevent the carbon fiber material from entering the exhaust pipeline together with the carrier gas.

[0044] Further, as shown in Figure 2 and Figure 4 , the inner cylinder 2 is internally hollow and installed with a partition plate 22 to separate the gas guiding chamber 21. The end face of the partition plate 22 towards the first rotating shaft 41 is outwardly convex, and the convex size gradually decreases along the radial direction. Specifically, the center top end of the partition plate 22 is outwardly convex, and gradually inwardly converges along the radial direction until the edge meets the inner wall of the inner cylinder 2. As shown in Figure 2 , the connecting line between the center point and the edge point of the cross section of the partition plate 22 can be an outwardly convex curve, a straight line or an inwardly concave curve, and the main function of the partition plate 22 is to guide the heating gas introduced by the first rotating shaft 41 to be dispersed from the center to both sides, so as to more smoothly flow out from the gas outlet 23.

[0045] On the basis of the above embodiments, as shown in Figure 2 and Figure 4As shown, the distance between the outer wall of the inner cylinder 2 and the inner wall of the outer cylinder 1 gradually decreases in the direction away from the first rotating shaft 41, and thus the gap of the working chamber gradually decreases, which is beneficial to the gradual peeling of the carbon fiber material. Specifically, in some embodiments, the outer cylinder 1 can adopt a cylindrical cylinder, and the inner cylinder 2 can adopt a conical cylinder with a certain taper; or in other embodiments, the outer cylinder 1 adopts a conical cylinder with a certain taper, and the inner cylinder 2 adopts a cylindrical cylinder; or in yet other embodiments, the outer cylinder 1 and the inner cylinder 2 are both conical cylinders, but the tapers of the two are different. In addition, in addition to gradually reducing the gap between the two cylinders, the gradually increasing size of the movable protrusion 3 can also be used to achieve the gradual peeling of the carbon fiber material.

[0046] On the basis of the above embodiments, as shown in Figure 2 , Figure 4 and Figure 5 , the side wall of the inner cylinder 2 is provided with a heating assembly 7, the second rotating shaft 42 is provided with an electric slip ring 8, and the heating assembly 7 is electrically connected to the electric slip ring 8 through a cable 9. Specifically, the heating assembly 7 is embedded in the outer side wall of the inner cylinder 2, which can adopt an electric heating wire to heat the working chamber. The heating assembly 7 can be selected in different types and arrangements according to needs, for example, as shown in Figure 4 , the heating assembly 7 can be composed of a plurality of strip-shaped or rod-shaped heating elements distributed along the circumference of the inner cylinder 2, which extend in the length direction from the feeding port 11 to the discharging port 12; in addition, the heating assembly 7 can also be composed of a plurality of annular heating elements distributed along the axis of the inner cylinder 2, or can also be composed of a plurality of block-shaped heating elements uniformly spaced along the outer wall surface of the inner cylinder 2. The specific form of the heating assembly 7 is not limited here, as long as it can heat the working chamber. By setting the heating assembly 7, the carbon fiber material can be continuously heated, the temperature of the working chamber is kept balanced, the pyrolysis efficiency and peeling degree are improved, and the internal carbon fiber material cannot be completely pyrolyzed and peeled due to the high temperature of the heated gas in the early stage and the low temperature in the later stage. In some specific embodiments, the heating assembly 7 can not only keep the pyrolysis temperature constant, but also set different heating temperatures at different positions according to different properties of the carbon fiber material, and thus form different pyrolysis temperature zones to meet the diversified pyrolysis needs.

[0047] As shown in Figure 2 and Figure 5As shown, the heating assembly 7 is connected to the external electric slip ring 8 through the cable 9. The electric slip ring 8 can be a separate slip ring including a rotor 81 and a contact brush 82. The rotor 81 is provided with a conductive ring which can be in contact with the brush on the contact brush 82 to form a rotatable conduction loop. The rotor 81 is provided with a through hole and can be fixed on the second rotating shaft 42 or the adjacent coupling 800 by screws to rotate with the second rotating shaft 42. The contact brush 82 can be fixed on the equipment rack by bolts or bases to remain stationary. Different types and specifications of electric slip rings have different application ranges and performance indicators, and appropriate products can be selected according to specific conditions. By arranging the electric slip ring 8, the rotating motion can be realized at any angle and for an unlimited number of times, and the thermocouple or thermoelectric wire arranged inside the inner cylinder 2 can transmit electric energy or electric signals to the outside. The second rotating shaft 42 can also be a hollow rotating shaft to facilitate the arrangement of the cable 9 to be introduced into the inner cylinder 2. The cable 9 can transmit electric power to electrify and heat the heating assembly 7, and can also transmit control signals to transmit the real-time temperature of the heating assembly 7 to the controller to realize feedback of temperature control and facilitate accurate regulation and control of the temperature of the working chamber.

[0048] As shown in Figure 6 and Figure 7 The application further provides a pyrolysis and stripping integrated system for recycling carbon fiber materials, which comprises the pyrolysis and stripping integrated device 100 described above, and further comprises a gas conveying device 400, a gas heating device 500, a driving mechanism 600, a feeding device 200 and a discharging device 300. The gas outlet of the gas conveying device 400 is connected to the gas inlet of the gas heating device 500, the gas outlet of the gas heating device 500 is connected to the first rotating shaft 41 of the pyrolysis and stripping integrated device 100, the driving mechanism 600 is connected to the second rotating shaft 42 of the pyrolysis and stripping integrated device 100, the feeding device 200 is connected to the feeding port 11 of the pyrolysis and stripping integrated device 100, and the discharging device 300 is connected to the discharging port 12 of the pyrolysis and stripping integrated device 100.

[0049] Specifically, as shown in Figure 8 and Figure 9As shown, the feeding device 200 comprises a feeding tank 210, a discharge port 211 of the feeding tank 210 is connected to the feeding port 11 of the pyrolysis stripping integrated device 100 through a feeding pipe 220, and a discharge gate mechanism 230 is installed at the discharge port 211. The feeding tank 210 is used to store the carbon fiber composite material products to be recycled. The bottom of the feeding tank 210 is provided with the discharge port 211, so that the materials can be discharged from the feeding tank 210. The discharge gate mechanism 230 at the discharge port 211 can control the speed and quantity of material discharge. The discharge gate mechanism 230 is manually controlled or electrically controlled from outside, and the opening and closing of the valve can be adjusted as needed. The side plates near the bottom of the feeding tank 210 are provided as inclined plates. Through the inclined arrangement, the materials can be guided to fall to the discharge port 211, so as to prevent the materials from being accumulated in the feeding tank 210 to cause blockage or unevenness. The lowest end of each inclined plate coincides with the bottom of the discharge port 211, so as to ensure that the materials can be smoothly discharged. The top of the feeding tank 210 is provided with a sealable feeding gate 212. After the internal gas is exhausted and one working process is completed, the feeding gate 212 is opened and the materials required for the second round are added. The feeding gate 212 and the feeding pipe 220 are both provided with a visual window 221, so that the operator can adjust the opening and closing of the valve according to the discharge condition. The feeding device 200 can control the discharge of the materials through the feeding pipe 220 and the discharge gate mechanism 230, and the discharge process of the materials can be observed at the same time, so that the feeding process is more convenient, accurate and visual. At the same time, the high-temperature gas in the internal can be prevented from leaking, and the materials can be added in batches at a certain speed during the working process. The manual control is strong, the material discharge condition can be observed in real time, and the material discharge speed can be controlled in real time.

[0050] As shown in FIG. 3 and FIG. 4, the discharging device 300 is similar to the feeding device 200. Figure 10 and Figure 11 As shown, the discharging device 300 comprises a discharging tank 320, which is connected to the discharging port 12 of the pyrolysis stripping integrated device 100 through a discharging pipe 310. The bottom of the discharging tank 320 is provided with an inclined plate, and a discharging gate mechanism 330 is further arranged at the bottom of the discharging tank 320. The discharging gate mechanism 330 can be manually controlled or electrically controlled from outside, and the opening and closing of the valve can be adjusted as needed.

[0051] In some specific embodiments, the feeding device 200 and the discharging device 300 can also adopt a spiral conveying device.

[0052] The gas conveying device 400 can adopt a fan or a gas cylinder or other gas conveying equipment for conveying inert carrier gas. The gas heating device 500 can adopt a plate heater, i.e. a high-efficiency heat exchanger composed of a series of metal plates with a certain corrugated shape. After being electrified, the metal plates generate heat through resistance, and the plates are sealed and flow-guided by sealing gaskets, and two fluid channels of cold / hot are separated, and cold / hot heat exchange mediums flow through the respective channels and exchange heat with the separated plates to achieve the required temperature of the user. In addition, the gas heating device 500 can also adopt other types of heaters, such as using electric heating rods, infrared, high-frequency electromagnetic heaters and other equipment for direct heating, or can adopt a tubular heat exchanger or other equipment for heat exchange heating. For example Figure 6 and Figure 7 As shown in FIGS. 1, 2 and 3, the driving mechanism 600 includes a driving motor 610 and a turbine reducer 620, and the driving motor 610 is connected with the second rotating shaft 42 through the turbine reducer 620, a belt transmission mechanism 700 and a shaft coupling 800 in sequence. The rotating speed of the inner cylinder 2 can be reasonably adjusted through the turbine reducer 620 and the belt transmission mechanism 700, so as to adjust the discharge particle size. The belt transmission mechanism 700 can also be replaced by a chain transmission mechanism or a gear transmission mechanism or other transmission equipment. Further, a safety valve 900 connected with the press (or vacuum pump) can be arranged between the gas heating device 500 and the pyrolysis stripping integrated device 100. When the pressure in the system exceeds the set value, the safety valve 900 is automatically opened and part of the inert carrier gas is discharged, so as to avoid explosion or leakage accidents.

[0053] On the basis of the above-mentioned embodiments, the system can further comprise a tail gas treatment device (not shown in the figure), a gas inlet of the tail gas treatment device is connected to the exhaust port 13 of the pyrolysis-stripping integrated device 100, and a gas outlet of the tail gas treatment device is connected to a gas inlet of the gas conveying device 400. The tail gas treatment device can comprise a condenser, an adsorber and a catalyst connected in sequence. The condenser mainly uses cooling water or air to condense part of the organic matter in the tail gas into a liquid state, thereby reducing its concentration and toxicity and facilitating subsequent processing. The adsorber mainly uses activated carbon or zeolite and other adsorbents to adsorb part of the organic matter in the tail gas on the surface thereof, thereby further removing its pollutants and improving its purity. The catalyst mainly uses platinum or palladium and other catalysts to catalytically crack part of the organic matter in the tail gas at high temperature into harmless or low-hazard small molecules, thereby achieving the purpose of harmless treatment. Flow meters, pressure gauges and other instruments can also be used on the entire gas path to monitor the flow and pressure of the inert carrier gas in real time. The flow meters and pressure gauges can be installed on the gas path piping system and connected with an instrument system. The instrument system can be of a type having functions of data acquisition, processing, display, storage, alarm and the like, and reasonable parameter ranges and alarm values are set. The instrument system can communicate with a remote monitoring center through wireless or wired means and feed back the changes of various indexes in the system in real time, which is conducive to realizing automatic control of the entire pyrolysis-stripping integrated system. By providing the tail gas treatment device, the influence of the waste gas generated by the pyrolysis of the carbon fiber composite material on the environment and resources can be reduced, and the inert carrier gas can also be recycled and utilized, thereby saving costs.

[0054] As can be seen from the above embodiments, the pyrolysis-stripping integrated device 100 and system for recycling carbon fiber materials provided by the present application form a working chamber in the gap between the inner cylinder 2 and the outer cylinder 1. The working chamber is filled with the heating gas in the gas guide chamber 21, so that the carbon fiber materials to be recycled are subjected to high-temperature pyrolysis, the bonding force between the carbon fiber layers is weakened, and the resin matrix and the carbon fibers are separated. Then, the rotating movement of the inner cylinder 2 is utilized to extrude the carbon fiber materials through the movable protrusions 3 on the outer peripheral wall of the inner cylinder 2, so that the carbon fiber materials are subjected to slip delamination, and finally the carbon fibers with high added value are stripped off. The separated solid-phase carbon fiber materials are discharged through the discharge port 12, and the pyrolysis waste gas is discharged through the exhaust port 13. The integrated device and system combine the pyrolysis process and the mechanical stripping process, so that the carbon fibers can be subjected to high-temperature pyrolysis and delamination stripping at the same time. The carbon fiber materials are pyrolyzed or volatilize the resin matrix in rolling, so that the resin matrix and the carbon fibers are separated while the carbon fibers are prevented from being damaged by tangential abrasion. The original structure and mechanical properties of the carbon fibers can be ensured to the greatest extent, so that the carbon fibers with high added value can be preserved. In addition, the carbon fibers are subjected to radial pressure by the cylinder wall rolling and the movable protrusions, so that the carbon fibers are less damaged by tangential abrasion, and the recycling efficiency and quality of the carbon fiber composite materials are effectively improved.

[0055] The pyrolysis stripping integrated device 100 has high crushing efficiency, can effectively crush carbon fiber composites with different hardness and viscosity, has uniform crushing particle size, can adjust the size and number of the inner roller protrusions and the rotating speed ratio between the roller and the outer shell according to needs, control the discharge particle size, has simple structure, convenient operation, low maintenance cost, only needs to replace the inner roller protrusions and the outer shell liner regularly, is low in energy consumption, small in noise, and good in environmental protection performance.

[0056] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A pyrolytic stripping integrated device for recycling carbon fiber materials, characterized by, The device comprises an outer cylinder and an inner cylinder, the outer wall of the inner cylinder is embedded with a plurality of movable protrusions, and the inner cylinder is provided with a gas guide chamber at the first end; the inner cylinder is rotatably installed in the inner part of the outer cylinder through a first rotating shaft and a second rotating shaft, the inner part of the first rotating shaft is hollow to guide the heating gas into the gas guide chamber, the heating gas uses inert carrier gas to perform high-temperature degradation of carbon fiber composite material under oxygen-free or low-oxygen condition, and decomposes the gas product of the resin matrix in time; the side wall of the gas guide chamber is provided with a gas outlet, the outer cylinder is provided with a feeding port, a discharging port and an exhaust port, the feeding port is close to the gas outlet, and the discharging port and the exhaust port are away from the gas outlet; The outer wall of the inner cylinder is provided with a plurality of protrusion mounting positions, and the protrusion mounting positions are embedded with rolling bodies; the top end of the rolling body protrudes out of the protrusion mounting position to roll against the carbon fiber material to be recycled; The inner part of the inner cylinder is hollow and provided with a partition plate to separate the gas guide chamber; the end face of the partition plate towards the first rotating shaft protrudes outward, and the protruded size gradually decreases along the radial direction; the distance between the outer wall of the inner cylinder and the inner wall of the outer cylinder gradually decreases along the direction away from the first rotating shaft.

2. The pyrolytic stripping integrated device for recycling carbon fiber materials according to claim 1, characterized by, The gas outlet, the discharging port and the exhaust port are all provided with a filter screen.

3. The pyrolytic stripping integrated device for recycling carbon fiber material according to claim 1 or 2, characterized by, The side wall of the inner cylinder is provided with a heating assembly, the second rotating shaft is provided with an electric slip ring, and the heating assembly is electrically connected to the electric slip ring.

4. A pyrolytic stripping integrated system for recycling carbon fiber material, characterized by, The device comprises the pyrolysis stripping integrated device as claimed in any one of claims 1 to 3, a gas conveying device, a gas heating device, a driving mechanism, a feeding device and a discharging device, the gas outlet of the gas conveying device is connected to the gas inlet of the gas heating device, the gas outlet of the gas heating device is connected to the first rotating shaft of the pyrolysis stripping integrated device, the driving mechanism is connected to the second rotating shaft of the pyrolysis stripping integrated device, the feeding device is connected to the feeding port of the pyrolysis stripping integrated device, and the discharging device is connected to the discharging port of the pyrolysis stripping integrated device.

5. The pyrolytic stripping integration system for recycling carbon fiber material according to claim 4, characterized by, The feeding device comprises a feeding tank, the discharging port of the feeding tank is connected to the feeding port of the pyrolysis stripping integrated device through a feeding pipe, and the discharging port is provided with a discharging gate mechanism.

6. The pyrolytic stripping integration system for recycling carbon fiber material according to claim 5, characterized by, The device further comprises a tail gas treatment device, the gas inlet of the tail gas treatment device is connected to the exhaust port of the pyrolysis stripping integrated device, and the gas outlet of the tail gas treatment device is connected to the gas inlet of the gas conveying device.

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