CN116673300A - A high-efficiency pyrolysis recovery method and system for wind power blades - Google Patents

Abstract

The application relates to a high-efficiency pyrolysis recovery method and system for wind power blades. The method comprises the following steps: cutting a wind power blade to be recovered into a plurality of blade blocks, wherein the size of each blade block is smaller than the first size, and the wind power blade comprises resin and fiber yarns; soaking each blade block in a preset soaking solution to reduce interaction between resin and fiber in each blade block; the preset soaking liquid comprises tetrahydrofuran and polyethylene glycol, wherein the concentration of the polyethylene glycol in the tetrahydrofuran is 6wt%, and the soaking time is 12-24 hours; drying the soaked blade blocks, and crushing the dried blade blocks into blade particles with the size smaller than the second size; pyrolyzing the blade particles with the size smaller than the second size under preset conditions to generate pyrolysis gas and a material containing fiber yarns; breaking the material containing the filaments into material particles having a size smaller than the third size to separate the filaments. The application has high pyrolysis efficiency and lower energy consumption.

Description

A high-efficiency pyrolysis recovery method and system for wind power blades

technical field

The invention relates to the technical field of solid waste treatment, in particular to a high-efficiency pyrolysis recovery method and system for wind power blades.

Background technique

Wind turbine blades are one of the core components of wind turbines. They are mainly composed of glass fiber, carbon fiber, balsa wood and PVC, all of which are high value-added materials. Therefore, when the wind turbines reach their service life, the wind turbine blades need to be recycled to avoid energy waste.

In order to recycle wind power blades, related technologies use pyrolysis to recycle wind power blades, but the pyrolysis efficiency is low and energy consumption is high.

Contents of the invention

Based on the technical problems of low pyrolysis efficiency and high energy consumption in existing recovery methods, an embodiment of the present invention provides a high-efficiency pyrolysis recovery system for wind power blades.

In the first aspect, an embodiment of the present invention provides an efficient pyrolysis recovery method for wind power blades, including:

Cutting the wind power blades to be recycled into a plurality of blade blocks, each of which has a size smaller than the first size, and the wind power blades include resin and fiber filaments;

Each blade block is soaked in a preset soaking solution to reduce the interaction between the resin and the fiber filaments in each blade block; the preset soaking solution includes tetrahydrofuran and polyethylene glycol, and the polyethylene glycol The concentration of alcohol in the tetrahydrofuran is 6wt%, and the soaking time is 12-24h;

drying the soaked leaf blocks, and breaking the dried leaf blocks into leaf particles with a size smaller than the second size;

Pyrolyzing blade particles with a size smaller than the second size under preset conditions to generate pyrolysis gas and material containing fiber filaments;

The filament-containing material is broken into material particles having a size smaller than a third size to separate the filaments.

In the second aspect, an embodiment of the present invention provides a high-efficiency pyrolysis recovery system for wind power blades, including: a pretreatment system, a soaking and drying system, a first crushing system, a pyrolysis system, and a second crushing system arranged in sequence; wherein,

The pretreatment system is used to cut the wind power blades to be processed into blade blocks whose size is smaller than the first size, and the wind power blades include resin and fiber filaments;

The soaking and drying system is used to soak each blade block in a preset soaking solution to reduce the interaction between the resin and fiber filaments in each blade block; the preset soaking solution includes tetrahydrofuran and polyethylene Diol, the concentration of the polyethylene glycol in the tetrahydrofuran is 6wt%, and the soaking time is 12～24h;

The first crushing system is used to dry the soaked blade blocks, and crush the dried blade blocks into blade particles with a size smaller than the second size;

The pyrolysis system is used to pyrolyze the blade particles whose size is smaller than the second size under preset conditions to generate pyrolysis gas and materials containing fiber filaments;

The second crushing system is used to crush the material containing fiber filaments into material particles whose size is smaller than the third size, so as to separate the fiber filaments.

In the embodiment of the present invention, the wind power blades are mainly processed by resin and reinforcing fibers. In order to ensure the strength of the wind power blades, the materials are tightly glued together. The permeability is low and the pyrolysis efficiency is low. Based on this, the method of this application first cuts the wind power blades into blade blocks, and then soaks each blade block in a preset soaking solution to reduce the interaction between the resin and the reinforcing fiber and improve the penetration of oxygen during the pyrolysis process Rate. Then the soaked leaf block is dried, and the dried leaf block is broken into smaller leaf particles to increase the heat exchange area during pyrolysis. By soaking and crushing, the pyrolysis energy consumption can be effectively reduced and the pyrolysis efficiency can be improved. Finally, use the second crushing device to crush the pyrolyzed material into material particles, so as to separate the fiber filaments from other substances, so as to obtain pure fiber filaments. In this application, the pyrolysis efficiency is high and the energy consumption is low.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic flow chart of an efficient pyrolysis recovery method for wind power blades provided by an embodiment of the present invention;

Fig. 2 is a system schematic diagram of a high-efficiency pyrolysis recovery system for wind power blades provided by an embodiment of the present invention;

Fig. 3 is a system schematic diagram of a high-efficiency pyrolysis recovery system for wind turbine blades provided by another embodiment of the present invention.

Reference signs:

1- Pretreatment system;

2- Immersion drying system;

21 - immersion pool;

22 - Dryer;

3- The first crushing system;

31 - the first crushing device;

32 - the first screening device;

4- Pyrolysis system;

41 - pyrolysis furnace;

42 - heating furnace;

5- Second crushing system;

51 - the second crushing device;

52 - the second screening device;

6- Dust removal system;

7- Secondary combustion system;

8- Purification system;

81-Waste heat recovery equipment;

82 - scrubber;

83-activated carbon adsorption tank.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.

As shown in Figure 1, an embodiment of the present invention provides a high-efficiency pyrolysis recovery method for wind turbine blades, including:

Step 100, cutting the wind power blades to be recycled into a plurality of blade blocks, the size of each blade block is smaller than the first size, and the wind power blades include resin and fiber filaments;

Step 102, soak each blade block in a preset soaking solution to reduce the interaction between resin and fiber filaments in each blade block; the preset soaking solution includes tetrahydrofuran and polyethylene glycol, polyethylene glycol The concentration in tetrahydrofuran is 6wt%, and the soaking time is 12-24h;

Step 104, drying the soaked leaf blocks, and breaking the dried leaf blocks into leaf particles with a size smaller than the second size;

Step 106, pyrolyzing blade particles with a size smaller than the second size under preset conditions to generate pyrolysis gas and materials containing fiber filaments;

Step 108, crushing the material containing the fiber filaments into material particles whose size is smaller than the third size, so as to separate the fiber filaments.

In this embodiment, the wind turbine blades are mainly processed by resin and reinforcing fibers. In order to ensure the strength of the wind turbine blades, the materials are tightly bonded together. Due to the tight bonding between the materials, the oxygen in the pyrolysis process The permeability is low and the pyrolysis efficiency is low. Based on this, the method of this application first cuts the wind power blades into blade blocks, and then soaks each blade block in a preset soaking solution to reduce the interaction between the resin and the reinforcing fiber and improve the penetration of oxygen during the pyrolysis process Rate. Then the soaked leaf block is dried, and the dried leaf block is broken into smaller leaf particles to increase the heat exchange area during pyrolysis. By soaking and crushing, the pyrolysis energy consumption can be effectively reduced and the pyrolysis efficiency can be improved. Finally, use the second crushing device 51 to crush the pyrolyzed material into material particles, so as to separate the fiber filaments from other substances, so as to obtain pure fiber filaments. In this application, the pyrolysis efficiency is high and the energy consumption is low.

The execution manner of each step shown in FIG. 1 is described in detail below.

Firstly, for step 100, the wind power blade to be recycled is cut into a plurality of blade blocks, each blade block has a size smaller than a first size, and the wind power blade includes resin and fiber filaments.

This step is completed by the cutting system installed in the wind farm. In addition, the first size is determined based on the convenience of transportation and the size of the subsequent crushing device. The first size is preferably 1 meter, that is, cutting the wind power blades into blade pieces smaller than 1 meter. To be applicable to most transportation methods and most crushing systems, of course, the first size is not limited to this.

In addition, before cutting wind power blades, metal objects such as metal lightning protection wires, blade tip aluminum alloys, blade tail connecting bolts and other metal objects on the blades need to be removed and recycled to make full use of energy.

Then, for step 102, each blade piece is soaked in a preset soaking solution to reduce the interaction between the resin and the fiber filaments in each blade piece; the preset soaking solution includes tetrahydrofuran and polyethylene glycol, polyethylene glycol The concentration of ethylene glycol in tetrahydrofuran is 6wt%, and the soaking time is 12-24h.

In this step, the purpose of soaking is to reduce the interaction between the resin and fiber filaments in each blade block, which can be done in the soaking tank 21 . The soaking solution is usually composed of an organic solvent and a swelling agent. The organic solvent is preferably tetrahydrofuran, and the swelling agent is preferably polyethylene glycol. The concentration of polyethylene glycol in tetrahydrofuran is 6 wt%, and the soaking time is 12-24 hours. Under the above conditions, the interaction between the various materials can be reduced in a relatively short period of time.

Next, for step 104, the soaked blade pieces are dried, including:

The soaked leaf block is dried at a preset temperature to remove the soaking liquid in the leaf block; the preset temperature is any temperature between 60°C and 120°C.

In this step, the drier 22 can be used to dry the blade block, and the soaked blade block is transported to the drier 22 by a belt conveyor. The drier 22 can be a chain plate dryer 22, which has a drain Dry function, that is, to drain the blade block first to recover the soaking liquid as much as possible to avoid waste of soaking liquid, and then separate the remaining soaking liquid by heating and evaporating. In addition, the temperature is between 60 and 120°C, which is conducive to the volatilization of the soaking liquid and quicker drying. At the same time, the resin will also evaporate part of the organic gas, reducing the energy consumption of subsequent pyrolysis.

In some embodiments, the dried leaf pieces are each broken into leaf particles having a size smaller than the second size, comprising:

crushing each of the blade blocks to obtain first blade particles having a size larger than the second size and second blade particles having a size smaller than the second size;

separating the first blade particles and the second blade particles, and re-crushing the separated first blade particles into second blade particles having a size smaller than the second size, so as to achieve uniform crushing of the dried blade pieces Leaf particles having a size smaller than the second size are formed.

In some embodiments, this step is completed based on the first crushing system 3;

The first crushing system 3 comprises a first crushing device 31 and a first screening device 32, the inlet of the first screening device 32 communicates with the outlet of the first crushing device 31, and the outlet of the first screening device 32 communicates with the first crushing device 32. The entrance of 31 is connected;

All the dried blade blocks are broken into blade particles with a size smaller than the second size, including:

Using the first crushing device 31 to crush each blade block into blade particles, the blade particles include first blade particles having a size larger than the second size and second blade particles having a size smaller than the second size;

Using the first screening device 32 to separate the first blade particles and the second blade particles, and return the first blade particles to the first crushing device 31;

The first blade particles discharged from the first screening device 32 are crushed by the first crushing device 31 into blade particles having a size smaller than the second size.

In this step, the smaller the particle size of the leaf particles, the more complete the pyrolysis, so the smaller the leaf particles obtained through the first crushing device 31, the better. Usually, after primary crushing by the first crushing device 31, the size of most blade particles is smaller than the second size. At this size, less power is consumed and pyrolysis is favored. However, there are also a small number of blade particles whose size is larger than the second size, and the large size particles will reduce the pyrolysis effect and reduce the recovery rate of fiber filaments. Therefore, it is necessary to set the first screening device 32, which can screen out the first blade particles with a size greater than the second size, and return to the first crushing device 31 to be re-broken into particles with a size smaller than the second size, thereby improving pyrolysis. efficiency. In this embodiment, the second size is preferably 50 mm, and of course it may be other, which is not specifically limited in this application.

In addition, the first crushing device 31 is preferably a two-stage crusher, the first screening device 32 is preferably a linear vibrating screen, and the blade particles crushed by the first crushing device 31 are transported to the first screening device 32 by a belt conveyor.

Then, for step 106, the pyrolysis of blade particles with a size smaller than the second size under preset conditions is completed based on the pyrolysis system 4;

Pyrolysis system 4 comprises pyrolysis furnace 41 and heating furnace 42, the first inlet of pyrolysis furnace 41 communicates with the outlet of first screening device 32, the second inlet communicates with the outlet of heating furnace 42, the solid of pyrolysis furnace 41 The outlet is communicated with the outside world, and the gas outlet of the pyrolysis furnace 41 is communicated with the outside world;

Step 106, including:

Utilize the heating furnace 42 to heat the preset combustible gas into high-temperature flue gas at a preset temperature;

Using high-temperature flue gas to provide preset conditions for the pyrolysis furnace 41;

Under preset conditions, the blade particles whose size is smaller than the second size are pyrolyzed by the pyrolysis furnace 41 to generate pyrolysis gas and materials including fiber filaments.

In this step, the combustible gas of the heating furnace 42 is preferably natural gas, and of course other combustible gases can also be used. The high-temperature flue gas at the preset temperature is high-temperature flue gas greater than 850°C, so that the generation of harmful gases can be avoided. The preset conditions are that the pyrolysis temperature is 300-400° C., the pyrolysis time is 60-90 minutes, and the oxygen content in the pyrolysis process is less than <10%. Pyrolysis of blade particles under the above preset conditions will not produce pyrolysis oil, will not produce hazardous waste, and the recovered fiber filament strength > 90%, fiber filament purity > 95%, VOC in exhaust gas < 50mg/m ³ . In addition, the pyrolysis furnace 41 is preferably a horizontal rotary kiln, and the blade particles flowing out of the first screening device 32 are transported into the pyrolysis furnace 41 by a screw conveyor.

Finally, step 108 includes: crushing the material containing fiber filaments to obtain first material particles with a size larger than the third size and second material particles with a size smaller than the third size;

separating the first material particles from the second material particles, and re-crushing the separated first material particles into second material particles having a size smaller than a third size;

The fiber filaments are separated from the second material particles to obtain fiber filaments.

In some embodiments, step 108 is completed based on the second crushing system 5; the second crushing system 5 includes a second crushing device 51 and a second screening device 52, the inlet of the second crushing device 51 is connected with the pyrolysis furnace 41 The solid outlet is communicated, the outlet of the second crushing device 51 is communicated with the inlet of the second screening device 52, and the outlet of the second screening device 52 is communicated with the inlet of the first crushing device 31;

The concrete realization process of step 108 is:

Using the second crushing device 51 to crush the material into material particles, the material particles include first material particles with a size larger than the third size and second material particles with a size smaller than the third size;

The first material particles and the second material particles are separated by the second screening device 52, and the first material particles are returned to the first crushing device 31, and the second material particles are discharged to the outside to obtain fiber filaments.

In this embodiment, the smaller the particle size of the material particles is, the more favorable it is to separate the fiber filaments from the material. Usually, after primary crushing by the second crushing device 51, the size of most of the material particles is smaller than the third size. At this size, less power is consumed and separation of filaments is facilitated. However, there are also a small number of material particles whose size is larger than the third size. Therefore, it is necessary to set up a second screening device 52 , which can screen out the first material particles whose size is larger than the third size, and return them to the first crushing device 31 . Then, use the first crushing device 31 to crush the first material particles discharged from the second screening device 52 into material particles with a size smaller than the third size, and perform pyrolysis again, thereby increasing the recovery rate of fiber filaments. In addition, in this embodiment, the third dimension is preferably 50 mm, and of course it may be other, which is not specifically limited in this application.

It should also be noted that waste gas will inevitably be generated during the recycling process, for example, when the wind power blades to be recycled are cut into multiple blade blocks, and/or when the dried blade blocks are broken into When the blade particles with a size smaller than the second size are carried out, and/or, when performing pyrolysis of the blade particles with a size smaller than the second size under preset conditions, and/or, when performing the When the material is broken into material particles with a size smaller than the third size, exhaust gas will be generated.

Therefore, in order to avoid exhaust gas pollution of the environment. In some embodiments, the method of the present invention also includes:

Purify the generated exhaust gas to obtain gas that meets environmental protection emission standards.

In some embodiments, this step is completed based on the dust removal system 6 .

It should also be noted that, on the one hand, the waste gas discharged from the dust removal system 6 contains pyrolysis gas, and the pyrolysis gas contains organic gas; The soaking liquid in 21 will volatilize, and part of the organic matter in the resin will also evaporate. The above-mentioned gases all have high combustion value, and if they are discharged directly, energy will be wasted.

Therefore, in some embodiments, the method of the present invention also comprises:

Secondary combustion of the soaking liquid volatilized during the drying process and the pyrolysis gas generated during the pyrolysis process to generate high-temperature flue gas;

The high-temperature flue gas is used to provide heat required for drying the leaf blocks to the soaked leaf blocks.

In some embodiments, this process is completed based on the secondary combustion system 7 .

Of course, harmful substances such as dust also exist in the generated high-temperature flue gas. Therefore, in some embodiments, the method of the present invention further includes using the purification system 8 to purify the high-temperature flue gas generated by the secondary combustion system 7 . Purification system 8 includes waste heat recovery equipment 81, washing tower 82 and activated carbon adsorption tank 83; waste heat recovery equipment 81 includes cold source inlet, cold source outlet, heat source inlet and heat source outlet, heat source inlet is connected with the outlet of secondary combustion system 7, heat source The outlet is connected with the inlet of the washing tower 82, the cold source inlet is connected with the gas outlet of the dryer 22, the cold source outlet is connected with the gas inlet of the dryer 22, the outlet of the washing tower 82 is connected with the inlet of the activated carbon adsorption tank 83, and the activated carbon adsorption tank The exit of 83 communicates with the outside world.

The method of the present invention also includes: using the waste heat recovery device 81 to provide heat for the soaked blade blocks. In this embodiment, by setting the waste heat recovery equipment 81, the high-temperature flue gas is used as the heat source, and the gas or liquid of the dry blade block is used as the cold source. Dry the gas or liquid of the blade block, so that the heat of the high-temperature flue gas can be effectively recovered and the waste of energy can be avoided.

The method can effectively recycle the fiber filaments in the wind power blades by soaking and drying the blade blocks, crushing, pyrolyzing and secondary combustion. The recovery purity of the fiber filaments is greater than 95%, and the fiber strength is greater than 90%.

As shown in Figure 2, the embodiment of the present invention also provides a high-efficiency pyrolysis recovery system for wind power blades, including: a pretreatment system 1, a soaking and drying system 2, a first crushing system 3, a pyrolysis system 4 and The second crushing system 5; wherein,

The pretreatment system 1 is used to cut the wind power blades to be processed into blade blocks whose size is smaller than the first size, and the wind power blades include resin and fiber filaments;

The soaking and drying system 2 is used to soak each blade piece in a preset soaking solution to reduce the interaction between the resin and the fiber filaments in each blade piece; the preset soaking solution includes tetrahydrofuran and poly Ethylene glycol, the concentration of the polyethylene glycol in the tetrahydrofuran is 6wt%, and the soaking time is 12～24h;

The first crushing system 3 is used to dry the soaked blade blocks, and crush the dried blade blocks into blade particles with a size smaller than the second size;

The pyrolysis system 4 is used to pyrolyze the blade particles whose size is smaller than the second size under preset conditions to generate pyrolysis gas and materials containing fiber filaments;

The second crushing system 5 is used to crush the material containing fiber filaments into material particles whose size is smaller than the third size, so as to separate the fiber filaments.

In some embodiments, the soaking and drying system 2 includes a soaking tank 21 and a dryer 22, the soaking tank 21 is used for soaking the blade pieces, and the dryer 22 is used for drying the soaked blade pieces;

The first crushing system 3 includes a first crushing device 31, and the first crushing device 31 is used to crush the dried blade blocks into blade particles;

Pyrolysis system 4 comprises pyrolysis furnace 41 and heating furnace 42, the first inlet of pyrolysis furnace 41 communicates with the outlet of first crushing device 31, the second inlet communicates with the outlet of heating furnace 42, and the solid outlet of pyrolysis furnace 41 It communicates with the second crushing system 5, and the gas outlet of the pyrolysis furnace 41 communicates with the outside world; the heating furnace 42 is used to provide the high-temperature flue gas of the preset temperature to the pyrolysis furnace 41, and the pyrolysis furnace 41 is used for dissolving The blade particles discharged through the first crushing device 31 are pyrolyzed to obtain pyrolysis gas and materials containing fiber filaments;

The second crushing system 5 includes a second crushing device 51, the solid outlet of the pyrolysis furnace 41 communicates with the inlet of the second crushing device 51, and the second crushing device 51 is used to crush the material discharged from the pyrolysis furnace 41 into material particles, to obtain filaments.

As shown in Figure 3, in some embodiments, the first crushing system 3 also includes a first screening device 32, the inlet of the first screening device 32 communicates with the outlet of the first crushing device 31, and the first screening device 32 The outlets of are communicated with the inlet of the first crushing device 31 and the first inlet of the pyrolysis furnace 41 respectively, and the first screening device 32 is used to return blade particles whose size is greater than the second size in the blade particles to the first crushing device 31, And the blade particles whose size is smaller than the second size are sent to the pyrolysis furnace 41 .

As shown in Figure 3, in some embodiments, it also includes a dedusting system 6 and a secondary combustion system 7, the gas outlet of the pyrolysis furnace 41 communicates with the inlet of the dedusting system 6, the outlet of the dedusting system 6 and the gas of the dryer 22 The outlets communicate with the inlets of the secondary combustion system 7 respectively, and the secondary combustion system 7 is used to burn the organic gas discharged from the dryer 22 and the dust removal system 6 .

In some embodiments, a purification system 8 is also included. The purification system 8 includes a waste heat recovery device 81, a washing tower 82, and an activated carbon adsorption tank 83; the waste heat recovery device 81 includes a cold source inlet, a cold source outlet, a heat source inlet, and a heat source outlet. The heat source The inlet is connected with the outlet of the secondary combustion system 7, the heat source outlet is connected with the inlet of the washing tower 82, the cold source inlet is connected with the gas outlet of the dryer 22, the cold source outlet is connected with the gas inlet of the dryer 22, and the outlet of the washing tower 82 is connected. It communicates with the inlet of the activated carbon adsorption tank 83, and the outlet of the activated carbon adsorption tank 83 communicates with the outside world.

In some embodiments, the second crushing system 5 further includes a second screening device 52, the inlet of the second screening device 52 communicates with the outlet of the second crushing device 51, and the outlet of the second screening device 52 communicates with the first crushing device 51. The inlet of the device 31 is connected, and the second screening device 52 is used to return the material particles whose size is larger than the second size among the material particles to the first crushing device 31 .

In some embodiments, the second screening device 52 includes at least two layers of screens of different specifications, which are used to discharge the fiber filaments in the material particles discharged from the second crushing device 51 to different collection devices according to different sizes and specifications. .

The second screening device 52 classifies the fiber filaments according to different sizes, and the fiber filaments of each size are collected separately, which can meet the use requirements of more scenarios and increase its recycling value as much as possible.

It should also be noted that the above-mentioned systems and equipment are all designed with micro-negative pressure, so as to prevent exhaust gas from leaking and polluting the environment.

In addition, since the above-mentioned system is based on the same idea as the method embodiment of the present invention, the specific content can refer to the description in the method embodiment of the present invention, and will not be repeated here.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or sequence. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional same elements in the process, method, article or apparatus comprising said element.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some 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 various embodiments of the present invention.

Claims (10)

1. The efficient pyrolysis recovery method for the wind power blade is characterized by comprising the following steps of:

cutting a wind power blade to be recovered into a plurality of blade blocks, wherein the size of each blade block is smaller than a first size, and the wind power blade comprises resin and fiber yarns;

soaking each blade block in a preset soaking solution to reduce interaction between resin and fiber in each blade block; the preset soaking liquid comprises tetrahydrofuran and polyethylene glycol, wherein the concentration of the polyethylene glycol in the tetrahydrofuran is 6wt%, and the soaking time is 12-24 hours;

drying the soaked blade blocks, and crushing the dried blade blocks into blade particles with the size smaller than the second size;

pyrolyzing the blade particles with the size smaller than the second size under preset conditions to generate pyrolysis gas and a material containing fiber yarns;

breaking the material containing the fiber filaments into material particles having a size less than a third size to separate the fiber filaments.

2. The method of claim 1, wherein drying the soaked pieces of leaf comprises:

drying the soaked blade blocks at a preset temperature to remove the soaking liquid in the blade blocks; the preset temperature is any one of 60-120 ℃.

3. The method as recited in claim 2, further comprising:

secondary combustion is carried out on the soaking liquid volatilized in the drying process and the pyrolysis gas generated in the pyrolysis process so as to generate high-temperature flue gas;

and providing the heat required for drying the blade blocks for the soaked blade blocks by utilizing the high-temperature flue gas.

4. The method of claim 1, wherein the crushing of the dried blade pieces into blade particles having a size smaller than the second size comprises:

crushing each blade block to obtain first blade particles with the size larger than the second size and second blade particles with the size smaller than the second size;

and separating the first blade particles from the second blade particles, and re-crushing the separated first blade particles into second blade particles with the size smaller than the second size, so as to crush the dried blade blocks into blade particles with the size smaller than the second size.

5. The method according to claim 1, wherein the preset conditions are: the pyrolysis temperature is 300-400 ℃, the pyrolysis time is 60-90 min, and the oxygen content in the pyrolysis process is less than 10%.

6. The method of claim 1, wherein the breaking up the material comprising filaments into material particles having a size less than a third size to separate the filaments comprises:

crushing the material containing the fiber yarns to obtain first material particles with the size larger than a third size and second material particles with the size smaller than the third size;

separating the first material particles from the second material particles, and re-crushing the separated first material particles into second material particles with a size smaller than a third size;

separating the filaments from the second material particles to obtain filaments.

7. The method of claim 1, wherein the step of determining the position of the substrate comprises,

when cutting the wind power blade to be recovered into a plurality of blade pieces, and/or when crushing the dried blade pieces into blade particles with a size smaller than a second size, and/or when performing pyrolysis of the blade particles with the size smaller than the second size under preset conditions, and/or when performing crushing of the material containing fiber filaments into material particles with a size smaller than a third size, exhaust gas is generated;

the method further comprises the steps of:

purifying the generated waste gas to obtain the gas meeting the environmental emission standard.

8. The method of claim 1, wherein the first dimension is 1 meter; and/or, the second dimension is 50mm; and/or, the third dimension is 50mm.

9. An efficient pyrolysis recovery system for wind power blades, comprising: the device comprises a pretreatment system, a soaking and drying system, a first crushing system, a pyrolysis system and a second crushing system which are sequentially arranged; wherein,,

the pretreatment system is used for cutting a wind power blade to be treated into blade blocks with the size smaller than a first size, and the wind power blade comprises resin and fiber filaments;

the soaking and drying system is used for soaking each blade block in a preset soaking liquid so as to reduce interaction between resin and fiber in each blade block; the preset soaking liquid comprises tetrahydrofuran and polyethylene glycol, wherein the concentration of the polyethylene glycol in the tetrahydrofuran is 6wt%, and the soaking time is 12-24 hours;

the first crushing system is used for drying the soaked blade blocks and crushing the dried blade blocks into blade particles with the size smaller than the second size;

the pyrolysis system is used for pyrolyzing the blade particles with the size smaller than the second size under preset conditions so as to generate pyrolysis gas and materials containing fiber yarns;

the second crushing system is used for crushing the material containing the fiber into material particles with the size smaller than a third size so as to separate the fiber.

10. The system of claim 9, further comprising:

the dust removal system is respectively communicated with the pretreatment system, the soaking and drying system, the first crushing system, the pyrolysis system and the second crushing system;

the dust removal system is used for purifying waste gas discharged by the pretreatment system, the soaking and drying system, the first crushing system, the pyrolysis system and the second crushing system so as to obtain gas meeting environmental protection emission standards.