CN116511221A - Recovery method of carbon fiber composite material pultruded panel - Google Patents
Recovery method of carbon fiber composite material pultruded panel Download PDFInfo
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- CN116511221A CN116511221A CN202310547398.XA CN202310547398A CN116511221A CN 116511221 A CN116511221 A CN 116511221A CN 202310547398 A CN202310547398 A CN 202310547398A CN 116511221 A CN116511221 A CN 116511221A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 103
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 103
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000011347 resin Substances 0.000 claims abstract description 22
- 239000002699 waste material Substances 0.000 claims abstract description 19
- 238000004064 recycling Methods 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 239000002912 waste gas Substances 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 8
- 238000007493 shaping process Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000000779 smoke Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 239000011490 mineral wool Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 abstract description 3
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract description 3
- 239000011261 inert gas Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011208 reinforced composite material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D1/00—Devices using naturally cold air or cold water
- F25D1/02—Devices using naturally cold air or cold water using naturally cold water, e.g. household tap water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/85—Paper; Wood; Fabrics, e.g. cloths
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The recovery method of the carbon fiber composite material pultruded plate comprises the following steps of S1, placing the finished waste carbon fiber plate on a material frame according to the same length; s2, heating the carbon fiber plate to different degrees by utilizing a low temperature zone, a medium temperature zone and a high temperature zone in the sintering furnace equipment; s3, conveying the reduced carbon fibers subjected to high-temperature heating to a cooling system for cooling; s4, spraying the cooled carbon fibers to achieve the shaping effect, wherein the novel resin matrix is prepared by decomposing a resin matrix of the composite material into gases such as hydrogen, methane, hydrocarbon and the like and low-molecular-weight organic matters by adopting a principle of high-temperature heat treatment through inert gases and heat energy. The impurities and the waste gas are treated and discharged by special environmental protection equipment, the carbon fiber which can be processed secondarily is left, the production and treatment efficiency is high, the resin of the waste composite material is treated cleanly, and the method is suitable for recycling the waste carbon fiber composite material in a large scale.
Description
Technical Field
The invention relates to the technical field of carbon fiber composite material recovery, in particular to a recovery method of a carbon fiber composite material pultruded plate.
Background
Carbon fiber is a composite material reinforced fiber with excellent performance, and is increasingly applied to various fields such as aerospace, wind power blades, photovoltaic industry, automobiles, pressure vessels, sports and leisure articles and the like. With the rapid development of the composite material industry in recent years, the problem of recycling waste is increasingly prominent and cannot be ignored, wherein the number of waste carbon fiber boards is huge. The effective recovery and recycling of the waste are important components of the future sustainable development of the carbon fiber. The number of the waste carbon fiber boards prepared by the current domestic and foreign pultrusion processes is nearly ten thousand tons, and the recovery value of only one of the scrapped carbon fiber boards cannot be estimated. Since the carbon fiber composite material waste has a high recovery value, it is very necessary and very important to recycle the waste from the viewpoints of energy efficiency, market factors, and the like.
Recovery of carbon fiber Composites (CFRP) is very difficult, mainly for the following reasons: (1) The carbon fiber composite material has high specific strength and specific modulus and extremely strong corrosion resistance; (2) If the CFRP matrix is a thermosetting resin, its inherent cross-linking may result in the composite being unable to be remelted and plasticized; (3) CFRP is a multiphase composite whose different phases of physicochemical properties make recycling more difficult. In the recycling industry of carbon fiber reinforced composite materials, the recycling method of the fiber reinforced thermosetting matrix composite materials is the most mature at present and is mainly divided into a heat treatment recycling method and a chemical recycling method, the production treatment efficiency is low, the resin treatment of the waste composite materials is not clean, and the method is not suitable for recycling the waste carbon fiber composite materials in a large scale.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a recovery method of a carbon fiber composite material pultruded plate, which effectively solves the problems mentioned in the technical background.
In order to achieve the above purpose, the present invention provides the following technical solutions: the invention comprises the following steps of
S1, placing the finished waste carbon fiber plates on a material frame according to the same length;
s2, heating the carbon fiber plate to different degrees by utilizing a low temperature zone, a medium temperature zone and a high temperature zone in the sintering furnace equipment;
s3, conveying the reduced carbon fibers subjected to high-temperature heating to a cooling system for cooling;
s4, spraying the cooled carbon fibers to achieve the shaping effect.
According to the technical scheme: the sintering furnace equipment in the step S2 is characterized in that high-purity nitrogen is introduced into two ends of the furnace; the furnace is in an anaerobic state, and the inlet and the outlet of the furnace body are protected by nitrogen; after nitrogen is generated by the nitrogen generator, the nitrogen generator is connected to the air seals at the two ends of the furnace body through seamless steel pipes to isolate oxygen in the air from entering the furnace, and simultaneously, carbon fibers in the furnace are prevented from undergoing oxidation reaction; the epoxy resin in the carbon fiber board can generate a small amount of oxygen in the heating process, and the small amount of oxygen can support the combustion of the epoxy resin in the carbon fiber board for further combustion and is continuously discharged in a negative pressure state; and (3) protecting the periphery of the furnace body: the innermost layer of the furnace wall is provided with a white steel liner; the second layer is a resistance wire heating rod and is used for heating; the third layer is subjected to temperature protection by using heat-resistant rock wool; the outermost layer adopts a white steel jacket heat-resistant rock wool iron plate as an outer package.
According to the technical scheme: the feeding mode of the carbon fiber plate of the sintering furnace equipment in the step S2 is that the carbon fiber plate is placed on a transmission mesh belt driven by a motor, the mesh belt is made of high-temperature resistant stainless steel, and the speed of the transmission mesh belt can be adjusted according to the requirement; after the machine starts to run, the machine enters a low-temperature area, is gradually heated for about 20 minutes to soften the surface resin, and then is transmitted out of the low-temperature area to enter a medium-temperature area at about 150 ℃; gradually heating for about 35 min, transferring to medium temperature region at about 350deg.C, and chemically reacting in the medium temperature region to generate CO 2 、H 2 0, and the like, and generates a small amount of smoke, a smoke exhaust pipeline is arranged above the heating temperature zone every 2 meters, and all the smoke exhaust pipelines are communicated with the waste gas treatment device by adopting a joint control valve; the resin on the carbon fiber plate is partially decomposed in a medium temperature region, impurities and carbon fibers generated after decomposition are in a mixed state, the carbon fiber is continuously transmitted into a high temperature region at the temperature of about 350 ℃, the carbon fiber composite material plate just entering the high temperature region is basically reduced into carbon fibers, the residual residues can continuously generate chemical reaction at high temperature, and finally, only the carbon fibers without other impurities are left; gradually heating for 25 minutes to 600 ℃ and transferring the heated carbon fiber to a high-temperature area, and thoroughly separating carbon fiber from impurities in the high-temperature area.
According to the technical scheme: the exhaust gas treatment device comprises a reactor, a burner and a detector; the reactor is provided with a reaction cavity, and is provided with an air inlet pipe and an air outlet pipe which are communicated with the reaction cavity; the burner is arranged in the reactor and is used for emitting flame to the reaction cavity; the detector is arranged in the reactor, and the detector and the burner are both positioned at the same end of the reactor, and the detector is used for detecting the state of flame emitted by the burner; the detector is arranged at the same end of the burner in the reactor, so that the detector is closer to the burner, the detector can directly detect the flame state sent by the burner, the influence of dust generated in the combustion process on the detector is effectively avoided, the accuracy of the detector is improved, and the stable operation of the waste gas treatment device is ensured.
According to the technical scheme: the cooling system in the step S3 adopts a water cooling device, the water cooling device adopts a single-sided air inlet conventional tower, and the process principle is as follows: the warm water discharged from the condenser enters the tower through the pressure water return pipe, and passes through the water distribution area, the filler area and the rain area from top to bottom respectively, exchanges heat with the air flowing reversely, then is cooled, and falls into the water collecting tank at the lower part of the cooling tower to finish the process of collecting cooling water. The water in the water collecting tank is communicated with the cooling area, so that the temperature is stabilized at about 70 ℃.
According to the technical scheme: and step S4 of spraying treatment, namely conveying the carbon fibers cooled in the step S3 out of an area in the furnace filled with nitrogen, spraying with cold water to remove carbon fiber filaments floating in the air, and shaping the carbon fibers to a recoverable state.
The beneficial effects are that: the invention has novel structure, adopts the principle of high-temperature heat treatment, and decomposes the resin matrix of the composite material into gases such as hydrogen, methane, hydrocarbon and the like and organic matters with low molecular weight through inert gases and heat energy. The impurities and the waste gas are treated and discharged by special environmental protection equipment, the carbon fiber which can be processed secondarily is left, the production and treatment efficiency is high, the resin of the waste composite material is treated cleanly, and the method is suitable for recycling the waste carbon fiber composite material in a large scale.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a water cooling apparatus according to the present invention;
FIG. 3 is a schematic view of the structure of the sintering furnace apparatus of the present invention.
Description of the embodiments
The following describes embodiments of the present invention in further detail with reference to FIGS. 1-3.
An embodiment, as shown in FIGS. 1-3, provides a method for recycling a carbon fiber composite pultruded panel, comprising the steps of
S1, firstly, cleaning and finishing waste carbon plates, and placing finished waste carbon fiber plates on a material frame according to the same length;
s2, decomposing resin impurities by using a thermal furnace, and heating the carbon fiber board to different degrees by using a low temperature zone, a medium temperature zone and a high temperature zone in sintering furnace equipment;
s3, cooling after decomposition, and conveying the reduced carbon fibers subjected to high-temperature heating to a cooling system for cooling;
s4, spraying, namely spraying the cooled carbon fibers to achieve a shaping effect;
s5, sieving and finishing the reduced carbon fibers, and sieving and finishing the shaped carbon fibers.
The sintering furnace equipment in the step S2 is characterized in that high-purity nitrogen is introduced into two ends of the furnace; the furnace is in an anaerobic state, and the inlet and the outlet of the furnace body are protected by nitrogen; after nitrogen is generated by the nitrogen generator, the nitrogen generator is connected to the air seals at the two ends of the furnace body through seamless steel pipes to isolate oxygen in the air from entering the furnace, and simultaneously, carbon fibers in the furnace are prevented from undergoing oxidation reaction; the epoxy resin in the carbon fiber board can generate a small amount of oxygen in the heating process, and the small amount of oxygen can support the combustion of the epoxy resin in the carbon fiber board for further combustion and is continuously discharged in a negative pressure state; and (3) protecting the periphery of the furnace body: the innermost layer of the furnace wall is provided with a white steel liner; the second layer is a resistance wire heating rod and is used for heating; the third layer is subjected to temperature protection by using heat-resistant rock wool; the outermost layer adopts a white steel jacket heat-resistant rock wool iron plate as an outer package.
The feeding mode of the carbon fiber plate of the sintering furnace equipment in the step S2 is that the carbon fiber plate is placed on a transmission mesh belt driven by a motor, the mesh belt is made of high-temperature resistant stainless steel, and the speed of the transmission mesh belt can be adjusted according to the requirement; after the machine starts to run, the machine enters a low-temperature area, is gradually heated for about 20 minutes to soften the surface resin, and then is transmitted out of the low-temperature area to enter a medium-temperature area at about 150 ℃; gradually heating for about 35 min, transferring to medium temperature region at about 350deg.C, and chemically reacting in the medium temperature region to generate CO 2 、H 2 0, and the like, and generates a small amount of smoke, a smoke exhaust pipeline is arranged above the heating temperature zone every 2 meters, and all the smoke exhaust pipelines are communicated with the waste gas treatment device by adopting a joint control valve; the resin on the carbon fiber plate is partially decomposed in a medium temperature region, impurities and carbon fibers generated after decomposition are in a mixed state, the carbon fiber is continuously transmitted into a high temperature region at the temperature of about 350 ℃, the carbon fiber composite material plate just entering the high temperature region is basically reduced into carbon fibers, the residual residues can continuously generate chemical reaction at high temperature, and finally, only the carbon fibers without other impurities are left; gradually heating for 25 minutes to 600 ℃ and transferring the heated carbon fiber to a high-temperature area, and thoroughly separating carbon fiber from impurities in the high-temperature area.
The exhaust gas treatment device comprises a reactor, a burner and a detector; the reactor is provided with a reaction cavity, and is provided with an air inlet pipe and an air outlet pipe which are communicated with the reaction cavity; the burner is arranged in the reactor and is used for emitting flame to the reaction cavity; the detector is arranged in the reactor, and the detector and the burner are both positioned at the same end of the reactor, and the detector is used for detecting the state of flame emitted by the burner; the detector is arranged at the same end of the burner in the reactor, so that the detector is closer to the burner, the detector can directly detect the flame state sent by the burner, the influence of dust generated in the combustion process on the detector is effectively avoided, the accuracy of the detector is improved, and the stable operation of the waste gas treatment device is ensured.
The cooling system in the step S3 adopts a water cooling device, the water cooling device adopts a single-sided air inlet conventional tower, and the process principle is as follows: the warm water discharged from the condenser enters the tower through the pressure water return pipe, and passes through the water distribution area, the filler area and the rain area from top to bottom respectively, exchanges heat with the air flowing reversely, then is cooled, and falls into the water collecting tank at the lower part of the cooling tower to finish the process of collecting cooling water. The water in the water collecting tank is communicated with the cooling area, so that the temperature is stabilized at about 70 ℃.
And step S4 of spraying treatment, namely conveying the carbon fibers cooled in the step S3 out of an area in the furnace filled with nitrogen, spraying with cold water to remove carbon fiber filaments floating in the air, and shaping the carbon fibers to a recoverable state.
Working principle: arranging waste carbon fiber composite plates on a material frame, placing the carbon fiber composite plates on a transmission mesh belt which is driven by a motor and can control the speed and is made of stainless steel, and entering a low-temperature area after a machine starts to run: the resin enters a low temperature area at about 25 ℃, passes through the low temperature area at a constant speed of 0.5 m/min, is gradually heated for about 20 minutes to soften the surface resin, and then is transmitted out of the low temperature area at about 150 ℃ to enter a medium temperature area in a seamless connection way. Gradually heating at a constant speed of 0.8 m/min in a medium temperature zone for about 35 minutes, and gradually taking out from the medium temperature zone at about 350 ℃ to perform chemical reaction in the medium temperature zone. The heated resin material has CO2, H20 and other gases volatilized out and produces little smoke, so a smoke exhaust pipeline is arranged every 2 meters above the heating temperature zone, all the gases are communicated to the waste gas treatment device by adopting a controllable valve, and the waste gas is collected through 8 smoke exhaust pipelines in production and enters the waste gas treatment device. The resin on the carbon fiber plate is decomposed in the middle temperature area, and impurities generated after the decomposition after heating are mixed with the carbon fiber and are transmitted into the high temperature area at the temperature of about 350 ℃. The resin passes through the high temperature area at a constant speed of 1 m/min, is gradually heated for about 25 minutes, is transmitted to and output from the high temperature area to about 600 ℃, and the resin on the carbon fiber composite material plate is completely decomposed in the high temperature area. The carbon fiber composite material plate passing through the high temperature area is basically reduced into carbon fibers, the residual residues can continue to generate chemical reaction at high temperature, the generated waste gas is guided into the waste gas treatment device through the joint control valve pipeline, and finally, only the carbon fibers without other impurities are left.
The beneficial effects are that: the invention has novel structure, adopts the principle of high-temperature heat treatment, and decomposes the resin matrix of the composite material into gases such as hydrogen, methane, hydrocarbon and the like and organic matters with low molecular weight through inert gases and heat energy. The impurities and the waste gas are discharged through special environmental protection equipment, and the carbon fiber which can be processed secondarily is left.
All electric parts and the adaptive power supply are connected through wires by the person skilled in the art, and a proper controller and encoder should be selected according to actual conditions so as to meet control requirements, specific connection and control sequence, and the electric connection is completed by referring to the following working principles in the working sequence among the electric parts, and the detailed connection means are known in the art, and mainly introduce the working principles and processes as follows, and do not describe the electric control.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for recycling a carbon fiber composite pultruded panel is characterized by comprising the following steps: comprises the following steps
S1, firstly, cleaning and finishing waste carbon plates, and placing finished waste carbon fiber plates on a material frame according to the same length;
s2, decomposing resin impurities by using a thermal furnace, and heating the carbon fiber board to different degrees by using a low temperature zone, a medium temperature zone and a high temperature zone in sintering furnace equipment;
s3, cooling after decomposition, and conveying the reduced carbon fibers subjected to high-temperature heating to a cooling system for cooling;
s4, spraying, namely spraying the cooled carbon fibers to achieve a shaping effect;
s5, sieving and finishing the reduced carbon fibers, and sieving and finishing the shaped carbon fibers.
2. A method for recycling a carbon fiber composite pultruded panel according to claim 1, characterized in that: the sintering furnace equipment in the step S2 is characterized in that high-purity nitrogen is introduced into two ends of the furnace; the furnace is in an anaerobic state, and the inlet and the outlet of the furnace body are protected by nitrogen; after nitrogen is generated by the nitrogen generator, the nitrogen generator is connected to the air seals at the two ends of the furnace body through seamless steel pipes to isolate oxygen in the air from entering the furnace, and simultaneously, carbon fibers in the furnace are prevented from undergoing oxidation reaction; the epoxy resin in the carbon fiber board can generate a small amount of oxygen in the heating process, and the small amount of oxygen can support the combustion of the epoxy resin in the carbon fiber board for further combustion and is continuously discharged in a negative pressure state; and (3) protecting the periphery of the furnace body: the innermost layer of the furnace wall is provided with a white steel liner; the second layer is a resistance wire heating rod and is used for heating; the third layer is subjected to temperature protection by using heat-resistant rock wool; the outermost layer adopts a white steel jacket heat-resistant rock wool iron plate as an outer package.
3. A method for recycling a carbon fiber composite pultruded panel according to claim 2, characterized in that: the feeding mode of the carbon fiber plate of the sintering furnace equipment in the step S2 is that the carbon fiber plate is placed on a transmission mesh belt driven by a motor, the mesh belt is made of high-temperature resistant stainless steel, and the speed of the transmission mesh belt can be adjusted according to the requirement; after the machine starts to run, the machine enters a low-temperature area, is gradually heated for about 20 minutes to soften the surface resin, and then is transmitted out of the low-temperature area to enter a medium-temperature area at about 150 ℃; gradually heating for about 35 min, transferring to medium temperature region at about 350deg.C, and chemically reacting in the medium temperature region to generate CO 2 、H 2 0, etc. and with a small amount of smoke, are generated above the heating temperature zoneA smoke exhaust pipeline is arranged every 2 meters, and all smoke exhaust pipelines are communicated to the waste gas treatment device by adopting a joint control valve; the resin on the carbon fiber plate is partially decomposed in a medium temperature region, impurities and carbon fibers generated after decomposition are in a mixed state, the carbon fiber is continuously transmitted into a high temperature region at the temperature of about 350 ℃, the carbon fiber composite material plate just entering the high temperature region is basically reduced into carbon fibers, the residual residues can continuously generate chemical reaction at high temperature, and finally, only the carbon fibers without other impurities are left; gradually heating for 25 minutes to 600 ℃ and transferring the heated carbon fiber to a high-temperature area, and thoroughly separating carbon fiber from impurities in the high-temperature area.
4. A method for recycling a carbon fiber composite pultruded panel according to claim 3, characterized in that: the exhaust gas treatment device comprises a reactor, a burner and a detector; the reactor is provided with a reaction cavity, and is provided with an air inlet pipe and an air outlet pipe which are communicated with the reaction cavity; the burner is arranged in the reactor and is used for emitting flame to the reaction cavity; the detector is arranged in the reactor, and the detector and the burner are both positioned at the same end of the reactor, and the detector is used for detecting the state of flame emitted by the burner; the detector is arranged at the same end of the burner in the reactor, so that the detector is closer to the burner, and the detector can directly detect the flame state emitted by the burner.
5. A method for recycling a carbon fiber composite pultruded panel according to claim 1, characterized in that: the cooling system in the step S3 adopts a water cooling device, the water cooling device adopts a single-sided air inlet conventional tower, and the process principle is as follows: the warm water discharged from the condenser enters the tower through the pressure water return pipe, and passes through the water distribution area, the filler area and the rain area from top to bottom respectively, exchanges heat with the air flowing reversely, then is cooled, falls into the water collecting tank at the lower part of the cooling tower, completes the collecting process of cooling water, and ensures that the water in the water collecting tank is communicated with the cooling area to ensure that the temperature is stabilized at 70 ℃.
6. A method for recycling a carbon fiber composite pultruded panel according to claim 1, characterized in that: and step S4 of spraying treatment, namely conveying the carbon fibers cooled in the step S3 out of an area in the furnace filled with nitrogen, spraying with cold water to remove carbon fiber filaments floating in the air, and shaping the carbon fibers to a recoverable state.
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| CN202310547398.XA CN116511221A (en) | 2023-05-16 | 2023-05-16 | Recovery method of carbon fiber composite material pultruded panel |
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| CN202310547398.XA CN116511221A (en) | 2023-05-16 | 2023-05-16 | Recovery method of carbon fiber composite material pultruded panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117600194A (en) * | 2023-11-22 | 2024-02-27 | 江苏江拓力杨新材料科技有限公司 | Tail material recovery device for carbon fiber material processing |
-
2023
- 2023-05-16 CN CN202310547398.XA patent/CN116511221A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117600194A (en) * | 2023-11-22 | 2024-02-27 | 江苏江拓力杨新材料科技有限公司 | Tail material recovery device for carbon fiber material processing |
| CN117600194B (en) * | 2023-11-22 | 2024-05-03 | 江苏江拓力杨新材料科技有限公司 | Tail material recovery device for carbon fiber material processing |
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