CN117644598A - Method for recycling pyrolysis treatment inside retired wind power blade - Google Patents
Method for recycling pyrolysis treatment inside retired wind power blade Download PDFInfo
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- CN117644598A CN117644598A CN202410018703.0A CN202410018703A CN117644598A CN 117644598 A CN117644598 A CN 117644598A CN 202410018703 A CN202410018703 A CN 202410018703A CN 117644598 A CN117644598 A CN 117644598A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 27
- 238000004064 recycling Methods 0.000 title claims abstract description 18
- 238000011282 treatment Methods 0.000 title claims abstract description 17
- 150000003839 salts Chemical class 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000006731 degradation reaction Methods 0.000 claims abstract description 15
- 239000011261 inert gas Substances 0.000 claims abstract description 12
- 239000000047 product Substances 0.000 claims abstract description 12
- 238000004080 punching Methods 0.000 claims abstract description 11
- 238000010926 purge Methods 0.000 claims abstract description 7
- 239000012265 solid product Substances 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005485 electric heating Methods 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 235000010344 sodium nitrate Nutrition 0.000 claims description 6
- 239000004317 sodium nitrate Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000011027 product recovery Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000003733 fiber-reinforced composite Substances 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
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- 239000011734 sodium Substances 0.000 description 1
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- 238000004808 supercritical fluid chromatography Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Wind Motors (AREA)
Abstract
The invention discloses a method for recycling pyrolysis treatment inside retired wind power blades, which comprises the following steps: punching a hole on the surface of a shell at one side of the retired wind power blade, and placing the retired wind power blade after punching into a closed cavity; after inert gas purging is carried out on the closed cavity, a heating rod is placed in each hole of the retired wind power blade or heated molten salt is injected into the holes, so that the retired wind power blade is degraded under the inert atmosphere and high temperature conditions; and (3) recovering gas products through an exhaust channel in the degradation process of the retired wind power blade, and recovering residual solid product fibers after the retired wind power blade is degraded. According to the invention, the retired wind power blade can be subjected to subsequent recycling after being simply treated, so that a large amount of energy consumption and material consumption in the early-stage cutting and crushing process are saved, meanwhile, the product recovery rate is high, the fiber performance is good, the energy waste is reduced, and the energy conservation and emission reduction are facilitated.
Description
Technical Field
The invention relates to the technical field of resource recycling, in particular to a method for recycling pyrolysis treatment inside retired wind power blades.
Background
At present, wind power generation has become a very advanced, environment-friendly and sustainable energy development mode; however, in recent years, a large number of wind generating sets are about to reach the service life, and recycling waste blades is an important technical approach for avoiding environmental pollution and reducing resource waste; therefore, there is a need to develop more environmentally friendly treatments to recover retired wind blades.
The traditional retired wind power blade treatment mode mainly comprises landfill and incineration, so that the environment is polluted, resources are wasted greatly, and the requirements of sustainable development are not met. The main recovery modes of the thermosetting fiber reinforced composite material of the wind power blade at the present stage comprise methods such as mechanical recovery, heat recovery, chemical recovery (supercritical fluid method and solvent decomposition method), energy recovery and the like. Although the mechanical recovery method has high processing speed and simple process, and the recovered fibers can be applied to the building industry, the method can seriously damage the performance of the fibers in the recovery process, and only short fibers with different lengths can be obtained, so that most of the obtained regenerated products have low value. Chemical recovery can achieve clean fibers without significantly degrading their mechanical properties, but the recovery process of chemical recovery is costly, requires specific types of reactors and facilities to operate at both high temperatures and pressures, and in corrosive media, and most solvents are expensive, and the chemical composition of the waste liquid is very complex, and its treatment is also a significant challenge. The heat recovery method has higher processing capacity and recovery rate, and can degrade the resin serving as a matrix material, thereby recovering high-value fiber materials; the heat recovery process pyrolyses retired wind blades into a variety of valuable products, which is considered to be the most mature technology at the present stage. However, in the existing heat recovery methods, a mode of recovering retired wind power blades through external heating is adopted, and the mechanical properties of recovered fibers are affected due to the crushing pretreatment process, so that the reuse range of the recovered fibers is limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the method for recycling the inside pyrolysis treatment of the retired wind power blade, which omits the pretreatment steps of cutting, crushing and the like of the wind power blade by the existing method, reduces the pretreatment cost, protects the fiber structure, is simple and convenient to operate, can realize the large-scale efficient recycling of the retired blade, and meets the sustainable development requirement of the current society.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides a method for recycling pyrolysis treatment inside retired wind power blades, which comprises the following steps:
punching a hole on the surface of a shell at one side of the retired wind power blade, and placing the retired wind power blade after punching into a closed cavity;
after inert gas purging is carried out on the closed cavity, a heating rod is placed in each hole of the retired wind power blade or heated molten salt is injected into the holes, so that the retired wind power blade is degraded under the inert atmosphere and high temperature conditions;
and (3) recovering gas products through an exhaust channel in the degradation process of the retired wind power blade, and recovering residual solid product fibers after the retired wind power blade is degraded.
Optionally, the holes on the retired wind power blade are evenly distributed on one side shell surface.
Optionally, the hole diameter of the perforation on the retired wind power blade is 60-80 mm.
Optionally, the inert gas is nitrogen, argon or helium.
Alternatively, the molten salt is a mixture of sodium nitrate and sodium carbonate or a mixture of potassium nitrate and potassium carbonate.
Optionally, the mass ratio of the sodium nitrate to the sodium carbonate is 90 percent to 10 percent.
Optionally, the heating rod is an electric heating rod, and the electric heating rod adopts a graphite rod or a tungsten rod.
Optionally, the temperature of the heating rod or the molten salt is 500-800 ℃.
Optionally, the degradation time is 90-120 min.
Optionally, the closed cavity comprises an upper chamber and a lower chamber;
before degradation, placing the perforated retired wind power blade in a lower cavity, placing a heating rod or molten salt after injection heating in an upper cavity, and blowing inert gas into both the upper cavity and the lower cavity until the oxygen concentration in the closed cavity is detected to be lower than a certain value, and stopping blowing gas;
during degradation, a gate between the upper chamber and the lower chamber is opened, the heating rod or the heated molten salt is injected into each hole of the retired wind power blade through an automatic mechanical arm installed in the upper chamber, and the retired wind power blade is degraded under inert atmosphere and high temperature.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention can carry out subsequent resource utilization after simple treatment on the retired wind power blade, saves a great amount of energy consumption and material consumption in the early-stage cutting and crushing process, reduces the process complexity, has high product recovery rate and good fiber property, reduces the waste of energy sources, and is beneficial to promoting energy conservation and emission reduction.
2) The invention overcomes the defect that the conventional pyrolysis device needs to cut and crush the wind power blade to cause serious damage to the fiber performance, protects the fiber structure in the degradation process, has high quality of recovered fibers, and is beneficial to reutilization of the fibers.
3) According to the invention, the heating rod or the molten salt is used as a heat carrier and a catalyst for rapidly degrading the retired wind power blade, wherein the heating rod and the wind power blade can be fully contacted and uniformly heated in various aspects, and compared with a mode of external heating, the heating time is short and the efficiency is higher; the molten salt treatment technology can enhance the oxidability and high thermal conductivity of organic matters by using molten salt as a heat transfer medium, so that wastes can be rapidly cracked, the recovery rate of products is high, the waste of energy sources is reduced, and meanwhile, the molten salt can absorb harmful gases generated by pyrolysis, reduce the pollution to the environment and is beneficial to promoting energy conservation and emission reduction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for recovering pyrolysis treatment in retired wind power blades provided by the embodiment of the invention;
FIG. 2 is a schematic structural diagram of a perforated retired wind turbine blade and a closed chamber according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of the upper chamber and the lower chamber according to the embodiment of the present invention;
reference numerals illustrate: 1. a lower chamber; 2. an upper chamber; 3. a lower chamber air intake passage; 4. an upper chamber air intake passage; 5. a lower chamber exhaust passage; 6. an upper chamber exhaust passage; 7. an automated mechanical arm.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
As shown in FIG. 1, the method for recycling the inside of the retired wind power blade through pyrolysis provided by the embodiment of the invention comprises the following steps:
s1, punching a hole on the surface of a shell at one side of the retired wind power blade, and placing the retired wind power blade after punching in a closed cavity;
s2, after inert gas purging is carried out on the closed cavity, a heating rod is placed in each hole of the retired wind power blade or heated molten salt is injected into the holes, so that the retired wind power blade is degraded under the inert atmosphere and high temperature conditions;
and S3, recovering gas products through an exhaust channel in the degradation process of the retired wind power blade, and recovering residual solid product fibers after the retired wind power blade is degraded.
As an embodiment of the present invention, the structure of the closed cavity is shown in fig. 2 and 3, and the closed cavity comprises an upper chamber 2 and a lower chamber 3; the pyrolysis treatment comprises the following specific processes: firstly, punching holes on the surface of a shell at one side of a retired wind power blade, placing the retired wind power blade in a lower cavity 1 in a large closed cavity with the punched holes facing upwards, respectively purging inert gas through an air inlet channel 3 of the lower cavity 1 and an air inlet channel 4 of an upper cavity 2, discharging the gas through an air outlet channel 5 in the lower cavity 1 and an air outlet channel 6 in the upper cavity 2 until the oxygen concentration in the cavity is detected to be lower than a certain value, and stopping introducing the gas; then, opening a gate between the chamber 1 and the chamber 2, and placing a heating rod placed in the upper chamber 2 or molten salt after injection heating into each hole of the retired wind power blade through an automatic mechanical arm 7 installed on the upper chamber 2, wherein the retired wind power blade is degraded under inert atmosphere and high temperature; wherein the heating rod is an electric heating rod, and the molten salt is a mixture of nitrate and carbonate of alkali metal; and (3) recovering gas products through an exhaust channel 5 in the degradation process of the retired wind power blade, cooling to room temperature after the wind power blade is degraded, and opening a closed cavity to recover solid product fibers.
Further, the molten salt of this example is a mixture of sodium nitrate and sodium carbonate, the initial mixture (NaNO 3 :Na 2 CO 3 ) The mass ratio is 90 percent to 10 percent, and the molten salt can be recycled; the inert gas is nitrogen, argon or helium; the heating rod is an electric heating rod, and the electric heating rod adopts a graphite rod or a tungsten rod; the temperature of the heating rod or the molten salt is 500-800 ℃; the degradation time is 90-120 min.
In other embodiments, firstly, uniformly punching holes on the surface of a shell at one side of the retired wind power blade, wherein the number of the holes is properly increased or decreased according to the length of the wind power blade, and the hole diameter is 60-80 mm; secondly, placing the wind power blade in a lower chamber 1 in a large-scale closed cavity, storing a heating rod in an upper chamber 2 of the closed cavity, wherein the closed cavity is provided with air inlet channels 3 and 4 and air outlet channels 5 and 6, respectively introducing inert gas into the upper chamber 2 and the lower chamber 1 for purging until the oxygen concentration in the closed cavity is detected to be lower than a certain value, and stopping introducing gas; finally, opening a gate between the upper chamber 2 and the lower chamber 1, placing an electric heating rod in each hole of the retired wind power blade through an automatic mechanical arm 7 installed in the upper chamber 2, heating the electric heating rod to 700 ℃ by adopting a graphite rod or a tungsten rod, and further uniformly heating the wind power blade fiber reinforced composite material at a high temperature to provide heat for pyrolysis of the wind power blade, wherein generated pyrolysis gas, pyrolysis tar and the like are discharged from a product channel, and the pyrolysis time is 90min; and recovering gas products through an exhaust channel in the degradation process of the retired wind power blade, cooling to room temperature after the wind power blade is degraded, and opening a closed cavity to recover residual solid product fibers.
In other embodiments, firstly, uniformly punching holes on the surface of a shell at one side of a retired wind power blade, wherein the number of the holes is appropriately increased or decreased according to the length of the wind power blade, the aperture is 60-80 mm, placing the wind power blade in a lower chamber 1 in a large-scale closed cavity, storing molten salt in an upper chamber 2 of the closed cavity, and purging the upper chamber 2 and the lower chamber 1 by inert gas respectively until the oxygen concentration in the closed cavity is detected to be lower than a certain value, and stopping introducing the gas; then, opening a gate between the upper chamber 2 and the lower chamber 1, and injecting molten salt heated to 700 ℃ into each hole of the retired wind power blade through an automatic mechanical arm 7 installed in the upper chamber 2 to degrade the wind power blade; the used molten salt is a mixture of sodium nitrate and sodium carbonate or a mixture of potassium nitrate and potassium carbonate, and the nitrate is an oxidizing molten salt, so that the pyrolysis process of the wind power blade fiber reinforced composite material can be effectively catalyzed under the combined action of the oxidizing atmosphere and high-concentration alkali metal ions in the molten salt, and the matrix resin in the composite material is promoted to be converted into gas and liquid tar; meanwhile, alkali metal carbonate is alkaline, and acid gas generated by pyrolysis can be absorbed and solidified in situ in a molten state; the density of carbon residue generated by pyrolysis is generally similar to that of liquid molten salt, the carbon residue can be enriched at the upper middle part of the molten salt liquid in a gas-liquid-solid three-phase bubbling fluidization state, and gas generated by pyrolysis can be used as fuel gas for other industries after further treatment. The generated pyrolysis gas, pyrolysis tar and the like are discharged from the product channel, and the pyrolysis time is 90min; and finally, recovering gas products through an exhaust channel 5 in the degradation process of the retired wind power blade, cooling to room temperature after the wind power blade is degraded, and opening a closed cavity to recover residual solid product fibers.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. The method for recycling the pyrolysis treatment of the inside of the retired wind power blade is characterized by comprising the following steps of:
punching a hole on the surface of a shell at one side of the retired wind power blade, and placing the retired wind power blade after punching into a closed cavity;
after inert gas purging is carried out on the closed cavity, a heating rod is placed in each hole of the retired wind power blade or heated molten salt is injected into the holes, so that the retired wind power blade is degraded under the inert atmosphere and high temperature conditions;
and (3) recovering gas products through an exhaust channel in the degradation process of the retired wind power blade, and recovering residual solid product fibers after the retired wind power blade is degraded.
2. The method for recovering the inside pyrolysis of the retired wind power blade according to claim 1, wherein the holes on the retired wind power blade are uniformly distributed on the surface of the shell at one side.
3. The method for recycling the inside of the retired wind power blade according to claim 1, wherein the hole diameter of the punch hole on the retired wind power blade is 60-80 mm.
4. The retired wind power blade interior pyrolysis treatment recovery method according to claim 1, wherein the inert gas is nitrogen, argon or helium.
5. The method for recovering the inside pyrolysis of the retired wind power blade according to claim 1, wherein the molten salt is a mixture of sodium nitrate and sodium carbonate or a mixture of potassium nitrate and potassium carbonate.
6. The method for recycling the inner pyrolysis treatment of the retired wind power blade according to claim 5, wherein the mass ratio of sodium nitrate to sodium carbonate is 90-10%.
7. The method for recycling the inside of the retired wind power blade according to claim 1, wherein the heating rod is an electric heating rod, and the electric heating rod is a graphite rod or a tungsten rod.
8. The method for recycling the inside of the retired wind power blade according to claim 1, wherein the temperature of the heating rod or the molten salt is 500-800 ℃.
9. The method for recycling the inside of the retired wind power blade according to claim 1, wherein the degradation time is 90-120 min.
10. The method for recycling the inside of the retired wind power blade according to any one of claims 1-9, wherein the closed cavity comprises an upper cavity and a lower cavity;
before degradation, placing the perforated retired wind power blade in a lower cavity, placing a heating rod or molten salt after injection heating in an upper cavity, and blowing inert gas into both the upper cavity and the lower cavity until the oxygen concentration in the closed cavity is detected to be lower than a certain value, and stopping blowing gas;
during degradation, a gate between the upper chamber and the lower chamber is opened, the heating rod or the heated molten salt is injected into each hole of the retired wind power blade through an automatic mechanical arm installed in the upper chamber, and the retired wind power blade is degraded under inert atmosphere and high temperature.
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| CN202410018703.0A CN117644598A (en) | 2024-01-04 | 2024-01-04 | Method for recycling pyrolysis treatment inside retired wind power blade |
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| CN202410018703.0A CN117644598A (en) | 2024-01-04 | 2024-01-04 | Method for recycling pyrolysis treatment inside retired wind power blade |
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| CN117644598A true CN117644598A (en) | 2024-03-05 |
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| CN202410018703.0A Pending CN117644598A (en) | 2024-01-04 | 2024-01-04 | Method for recycling pyrolysis treatment inside retired wind power blade |
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| CN (1) | CN117644598A (en) |
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