Recycling process of wind turbine blades

Abstract

The patent relates to the technical field of wind power blade recycling and reuse, in particular to a wind power blade recycling and reuse process, which comprises the following steps: S1: cutting; S2: shredding: shredding the blade block; S3: first screening: screening the mixture into a first mixture and a second mixture; S3-1: PVC particle screening: crushing the first mixture in step S3, screening out the PVC particles and packaging; S4: crushing for fiber production: secondary crushing of the mixture; S5: second screening: screening into glass fiber reinforced plastic fiber bundles and fiber powder; S6: glass fiber reinforced plastic fiber bundle impurity removal; S7: third screening: classified screening according to the length of the glass fiber reinforced plastic fiber bundles; S8: powder production: crushing into fiber powder of a specified mesh size and packaging, and finally forming PVC particles, glass fiber reinforced plastic fiber bundles and fiber powder as industrial and building raw materials through cutting, shredding, crushing and multiple screening and crushing of the wind power blade, so that the retired wind power blade is effectively recycled and reused, and good economic benefits are achieved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade recycling and reuse technology, specifically to wind turbine blade recycling and reuse processes. Background Technology

[0002] Wind turbine blades are mainly made of thermosetting and fiber materials and are generally bulky. When wind turbine blades reach the end of their service life, they need to be disposed of. Currently, most companies only use manual cutting to cut them into relatively small blade pieces for reuse or disposal, and there is no complete and mature process and production line for wind turbine blade recycling and reuse. Summary of the Invention

[0003] The present invention aims to provide a process for recycling and reusing wind turbine blades, which can recycle and process waste wind turbine blades into final production raw materials.

[0004] To achieve the above objectives, the basic solution of the present invention is as follows: a wind turbine blade recycling and reuse process, comprising the following steps:

[0005] S1: Cutting: Cut the wind turbine blades to be recycled into blocks;

[0006] S2: Shredding: Shredding the blade pieces into a mixture of PVC blocks, PVC-coated fiberglass, sheet fiberglass, fiber bundles, and fiber powder;

[0007] S3: First screening: The mixture in step S2 is screened into a first-class mixture and a second-class mixture. The first-class mixture includes PVC blocks and fiberglass reinforced plastic (FRP) with PVC volume ratio greater than 70%. The second-class mixture includes sheet FRP, glass fiber bundles, and fiber powder.

[0008] S3-1: PVC particle screening: The first type of mixture in step S3 is crushed into PVC particles, sheet fiberglass, fiberglass fiber bundles and fiber powder. The PVC particles are screened out and packaged. The remaining part is the second type of mixture.

[0009] S4: Crushing and fiber making: The two types of mixtures screened out in step S3 and step S3-1 are crushed a second time to form a mixture of fiberglass fiber bundles and fiber powder.

[0010] S5: Second sieving: The mixture produced in step S4 is sieved into fiberglass fiber bundles and fiber powder;

[0011] S6: Fiberglass fiber bundle impurity removal;

[0012] S7: Third screening: The fiberglass bundles after impurity removal in step S6 are classified and screened according to the length of the fiberglass bundles, and are divided into qualified fiberglass bundles and unqualified fiberglass bundles. The qualified fiberglass bundles are then packaged.

[0013] S8: Powdering: The unqualified fiberglass bundles screened out in step S7 and the fiber powder screened out in step S5 are crushed into fiber powder of a specified mesh size and packaged.

[0014] Furthermore, step S1 also includes: classifying the cut blade blocks upon arrival at the factory, dividing the blade blocks into block materials containing core material and block materials without core material, with the block materials containing core material passing through step S2, step S3-1 and then step S4 in sequence, and the block materials without core material directly entering step S4 after step S2.

[0015] Furthermore, step S8 also includes a fourth sieving process, in which a sieve with a specified mesh size is used to sieve the pulverized fiber powder to meet the standards. The fiber powder that passes through the sieve is output and packaged, while the fiber powder that fails to pass through the sieve is pulverized again.

[0016] Furthermore, step S6 specifically involves washing, dehydrating, and drying the fiberglass bundles screened out in step S5 to remove the powder from the surface of the fiberglass bundles.

[0017] Furthermore, step S6 also includes structural adhesive removal, which involves color sorting the dried fiberglass bundles to remove structural adhesives that are different in color from the fiberglass bundles.

[0018] Furthermore, step 1 specifically involves cutting the wind turbine blades into blocks no longer than 1m, and using a dust removal fan to remove dust during the cutting process.

[0019] The beneficial effects of this scheme are: (1) Wind turbine blades are cut, shredded, crushed, screened and pulverized multiple times to finally form industrial and building materials such as PVC particles, fiberglass fiber bundles and fiber powder, thereby realizing the effective recycling of retired wind turbine blades and having good economic benefits.

[0020] (2) The cut blade blocks are divided into two categories according to whether they contain core material. The main component of the core material is PVC. The block material without core material does not contain PVC. By classifying the block material, the process steps can be adjusted according to different block materials. The block material without core material is directly crushed and made into fiber without PVC particle screening, which can reduce energy consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example

[0024] The basics are as follows: Figure 1 The process for recycling and reusing wind turbine blades includes the following steps:

[0025] S1: Cutting and sorting: Cut the wind turbine blades to be recycled into 1m*0.5m blocks. The cut blade blocks are then sorted upon arrival at the factory, into blocks containing core material and blocks without core material.

[0026] S2: Shredding: Shredding block materials containing core material into a mixture of PVC blocks, PVC-coated fiberglass, sheet fiberglass, fiberglass bundles and fiber powder; shredding block materials without core material into a mixture of sheet fiberglass, fiberglass bundles and fiber powder.

[0027] S3: First screening: The mixture of shredded blocky material containing core material in step S2 is screened into a first-class mixture and a second-class mixture. The first-class mixture includes PVC blocks and fiberglass reinforced plastic with PVC volume ratio greater than 70%. The second-class mixture includes sheet fiberglass reinforced plastic, glass fiber bundles and fiber powder.

[0028] S3-1: PVC particle screening: The first type of mixture in step S3 is crushed into PVC particles, sheet fiberglass, fiberglass fiber bundles and fiber powder. The PVC particles are screened out and packaged. The remaining part is the second type of mixture.

[0029] S4: Crushing and fiber making: The mixture of the two types of mixtures screened out in step S3 and step S3-1 and the blocky material without core material in step S2 is shredded and then crushed into a mixture of fiberglass fiber bundles and fiber powder.

[0030] S5: Second sieving: The mixture produced in step S4 is sieved into fiberglass fiber bundles and fiber powder;

[0031] S6: Fiberglass bundle impurity removal: The fiberglass bundles screened in step S5 are washed, dehydrated and dried to remove the powder on the surface of the fiberglass bundles. The dried fiberglass bundles are then color sorted to remove structural adhesives that are different in color from the fiberglass bundles.

[0032] S7: Third screening: The fiberglass bundles after impurity removal in step S6 are classified and screened according to the length of the fiberglass bundles, and are divided into qualified fiberglass bundles and unqualified fiberglass bundles. The qualified fiberglass bundles are then packaged.

[0033] S8: Powdering: The unqualified fiberglass bundles screened out in step S7 and the fiber powder screened out in step S5 are crushed into fiber powder of a specified mesh size. The crushed fiber powder is screened to meet the standards using a screen of a specified mesh size. The qualified fiber powder that can pass through the screen is output and packaged, while the unqualified fiber powder that cannot pass through the screen is crushed again.

[0034] The beneficial effects of this embodiment are: by cutting, tearing, crushing, screening and pulverizing wind turbine blades, they are finally formed into industrial and construction raw materials such as PVC particles, fiberglass fiber bundles and fiber powder, thereby realizing the effective recycling and utilization of retired wind turbine blades and having good economic benefits.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A process for recycling wind turbine blades, characterized in that: The method comprises the following steps: S1: cutting: cutting the wind turbine blade to be recycled into blocks, and classifying the cut blade blocks into block materials containing core materials and block materials not containing core materials; S2: shredding: shredding the blade blocks into a mixture of PVC blocks, PVC-containing glass steel, sheet glass steel, glass fiber bundles, and fiber powder; S3: first screening: screening the mixture of the block materials containing core materials after the step S2 treatment into a first mixture and a second mixture, the first mixture comprising PVC blocks and PVC-containing glass steel with a PVC volume ratio of more than 70%, and the second mixture comprising sheet glass steel, glass fiber bundles, and fiber powder; S3-1: PVC particle screening: crushing the first mixture in step S3 into PVC particles, sheet glass steel, glass steel fiber bundles, and fiber powder, screening out the PVC particles and packaging, and the remaining part being the second mixture; S4: crushing and fiberizing: crushing the second mixture screened out in step S3 and step S3-1 into a mixture of glass steel fiber bundles and fiber powder, and crushing the mixture of the block materials not containing core materials after the step S2 treatment into a mixture of glass steel fiber bundles and fiber powder; S5: second screening: screening the mixture produced in step S4 into glass steel fiber bundles and fiber powder; S6: glass steel fiber bundle impurity removal; S7: third screening: classifying and screening the glass steel fiber bundles after the impurity removal in step S6 according to the length of the glass steel fiber bundles into qualified glass steel fiber bundles and unqualified glass steel fiber bundles, and packaging the qualified glass steel fiber bundles; S8: powdering: crushing the unqualified glass steel fiber bundles screened out in step S7 and the fiber powder screened out in step S5 into fiber powder of a specified mesh size, selecting a screen with the specified mesh size to screen the crushed fiber powder, outputting and packaging the qualified fiber powder that can pass through the screen, and crushing the unqualified fiber powder that cannot pass through the screen again.

2. A wind turbine blade recycling process according to claim 1, characterised in that: The step S6 specifically comprises: washing, dehydrating, and drying the glass steel fiber bundles screened out in step S5 to remove the powder on the surface of the glass steel fiber bundles.

3. A wind turbine blade recycling process according to claim 2, characterised in that: The step S6 further comprises structure glue removal, and the glass steel fiber bundles after drying are subjected to color selection to remove structure glue with a color different from that of the glass steel fiber bundles.

4. A wind turbine blade recycling process according to claim 1, characterised in that: The step S1 specifically comprises: cutting the wind turbine blade into block materials with a length of not more than 1 m, and using a dust removal fan to remove dust during the cutting.

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