CN115846376A - Wind power blade recovery method based on control of pyrolytic oxidation - Google Patents
Wind power blade recovery method based on control of pyrolytic oxidation Download PDFInfo
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Abstract
The invention discloses a wind power blade recovery method based on control of pyrolytic oxidation, which comprises the following steps: (1) Cutting the waste wind power blade with the metal component removed into blocks; (2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks for 1-2 h at 280-320 ℃ in an inert atmosphere to obtain a carbonized product, wherein the inert atmosphere is nitrogen, argon or helium; (3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere at the temperature of 390-420 ℃ for 1-2 h, and recovering the reinforced fiber after the reaction is finished. The invention separates the carbonization process from the oxidation process, sets different atmospheres and reaction temperatures aiming at the carbonization reaction and the oxidation reaction, and reduces the reaction temperature in the recovery process to the maximum extent, thereby reducing the recovery energy consumption of the blade and simultaneously improving the quality of the recovered fiber.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment, relates to a wind power blade recovery method, and particularly relates to a wind power blade recovery method based on control of pyrolytic oxidation.
Background
The waste wind power blade is industrial solid waste with high added value. With the first batch of wind turbine generators in China reaching the service life, a large amount of waste blades need to be treated. At present, the treatment mode of waste blades is mainly landfill, which can destroy the soil structure and influence the ecological balance, and in addition, some harmful substances enter an underground water layer through the effects of diffusion, permeation and the like to cause the pollution of water resources. Pyrolysis is a novel method for recovering resin-based composite materials, and usually composite material matrix resin is converted into gaseous micromolecular compounds under the action of specific atmosphere and high temperature (not less than 850 ℃) to recover reinforcing fibers with higher added values, so that resource utilization is realized. The method can be used for recovering the wind power blades and has the characteristic of easiness in large scale because the wind power blades are mainly made of glass fiber or carbon fiber reinforced epoxy resin composite materials, but has the defects of high energy consumption, low quality of recovered fibers and the like when the waste blades are treated. Therefore, it is very important and necessary to develop a new wind turbine blade recovery technology.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a wind power blade recovery method based on control of pyrolytic oxidation. The recovery method effectively reduces the energy consumption of the related technology, has high recovery efficiency and high quality of the recovered fiber, and has wide application prospect in the field of recovery of waste wind power blades.
The embodiment of the invention provides a wind power blade recovery method based on control of pyrolytic oxidation, which comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks for 1-2 h at 280-320 ℃ in an inert atmosphere to obtain a carbonized product, wherein the inert atmosphere is nitrogen, argon or helium;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere at the temperature of 390-420 ℃ for 1-2 h, and recovering the reinforced fiber after the reaction is finished.
The embodiment of the invention separates the carbonization process from the oxidation process, and can realize blade carbonization only in the inert atmosphere of 280-320 ℃ and realize efficient oxidation of carbonized products only under the conditions of 8-16 percent of oxygen volume content and 390-420 ℃. According to the embodiment of the invention, different atmospheres and reaction temperatures are set for carbonization and oxidation reactions, and the reaction temperature in the recovery process is reduced to the greatest extent, so that the recovery energy consumption of the blades is reduced, and the quality of the recovered fiber is improved.
In some embodiments, the sizes of the waste wind power blades cut into blocks are as follows: the length is less than or equal to 20cm, and the width is less than or equal to 20cm.
In some embodiments, the inert atmosphere is a nitrogen atmosphere.
In some embodiments, the oxygen-containing atmosphere consists of nitrogen and oxygen, and the volume content of the oxygen is 8% to 16%. Preferably, the volume content of oxygen in the oxygen-containing atmosphere is 10-12%.
In some embodiments, the oxidation reaction is carried out in an oxidation furnace with mechanical stirring, the stirring paddle is in an anchor type, and the stirring speed is 1r/min to 2r/min.
In some embodiments, the reinforcing fibers are one or a mixture of glass fibers, carbon fibers.
In some embodiments, the wind blade recovery method further comprises: and (3) cooling the pyrolysis carbonization tail gas in the step (2) to 100-150 ℃, recovering tar in the pyrolysis carbonization tail gas, and evacuating after the cooled pyrolysis carbonization tail gas is adsorbed and purified by activated carbon.
In some embodiments, the cooling of the pyrolysis carbonization tail gas is performed in a cold trap, the temperature is reduced by heat exchange with normal temperature air, and tar in the pyrolysis carbonization tail gas is recovered.
Compared with the related art, the invention has the following beneficial effects:
(1) Carbonization and oxidation in the microscopic process of the traditional pyrolysis method are carried out simultaneously, and in order to ensure full reaction, the pyrolysis temperature is set to be higher (more than or equal to 850 ℃), which causes high energy consumption of wind power blades recovered by the traditional pyrolysis method, large heat damage to recovered fibers and influence on recovery value. The invention separates the carbonization process from the oxidation process, sets different atmospheres and reaction temperatures aiming at the carbonization reaction and the oxidation reaction, and reduces the reaction temperature in the recovery process to the maximum extent, thereby reducing the recovery energy consumption of the blade and simultaneously improving the quality of the recovered fiber.
(2) The control of pyrolytic oxidation disclosed in this invention is an innovation over conventional pyrolysis technology, rather than a simple pyrolysis process optimization. The inventor unexpectedly finds that the blade carbonization can be realized only in the inert atmosphere at 280-320 ℃, and the efficient oxidation of the carbonized product can be realized only under the conditions that the volume content of oxygen is 8-16% and the temperature is 390-420 ℃. During carbonization, the inert atmosphere can reduce the oxidation to the maximum extent, the carbonization cannot be realized due to too low temperature, the temperature is too high, and the energy consumption is high; during oxidation, the oxygen content is too low and the temperature is too low, the oxidation rate is slow or no oxidation occurs, the oxygen content is too high, the oxidation speed is too high, and the heat generated by the reaction is concentrated to cause thermal damage to the fibers.
(3) The reinforced fiber recovered by the method has better performance, the strength retention rate is more than 92 percent, the purity is more than 93 percent, and the reinforced fiber can be continuously used as a reinforced phase to prepare a composite material or used as a raw material for producing glass or carbon products.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a wind turbine blade recovery system based on control of pyrolytic oxidation according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a cold trap structure according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and is not to be construed as limiting the invention.
The starting materials and equipment used in the examples of the present invention may be commercially available or may be prepared or processed by known methods, unless otherwise specified.
The embodiment of the invention provides a wind power blade recovery method based on control of pyrolytic oxidation, which comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks for 1-2 h at 280-320 ℃ in an inert atmosphere to obtain a carbonized product, wherein the inert atmosphere is nitrogen, argon or helium;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere at the temperature of 390-420 ℃ for 1-2 h, and recovering the reinforced fiber after the reaction is finished.
Non-limiting examples are: the pyrolysis carbonization temperature can be 280 ℃, 285 ℃, 300 ℃, 310 ℃, 320 ℃ and the like, and the time can be 1h, 1.3h, 1.5h, 1.7h, 2h and the like. The temperature of the oxidation reaction can be 390 ℃, 400 ℃, 410 ℃, 415 ℃, 420 ℃ and the like, and the time can be 1h, 1.2h, 1.5h, 1.8h, 2h and the like.
The embodiment of the invention separates the carbonization process from the oxidation process, and can realize blade carbonization only in the inert atmosphere of 280-320 ℃ and realize efficient oxidation of carbonized products only under the conditions of 8-16 percent of oxygen volume content and 390-420 ℃. According to the embodiment of the invention, different atmospheres and reaction temperatures are set for carbonization and oxidation reactions, and the reaction temperature in the recovery process is reduced to the greatest extent, so that the recovery energy consumption of the blades is reduced, and the quality of the recovered fiber is improved.
In some embodiments, the sizes of the waste wind power blades cut into blocks are: the length is less than or equal to 20cm, and the width is less than or equal to 20cm. Further, the sizes of the waste wind power blades are as follows: the length is less than or equal to 10cm, and the width is less than or equal to 10cm. It can be understood that: the wind power blade is generally as long as tens of meters, and is cut into small pieces to facilitate the control of the pyrolysis carbonization and oxidation processes under the condition of considering both the treatment cost and the treatment efficiency. Non-limiting examples are: the size of the waste wind power blade can be cut into, for example, length × width =20cm × 20cm, 15cm × 15cm, 12cm × 12cm, 10cm × 10cm, 8cm × 8cm, and the like.
In some embodiments, the inert atmosphere is a nitrogen atmosphere.
In some embodiments, the oxygen-containing atmosphere consists of nitrogen and oxygen, the oxygen being present in an amount of 8% to 16% by volume. Preferably, the volume content of oxygen in the oxygen-containing atmosphere is 10% to 12%. Non-limiting examples are: the oxygen content may be 8%, 9%, 10%, 11%, 12%, 14%, 16%, etc. by volume.
As a specific example, for example, the size of the waste wind power blade is length × width =10cm × 10cm, and the total gas flow rate of the oxygen-containing atmosphere in the oxidation furnace may be 14L/min to 16L/min; preferably, the total flow of gas is 15L/min. Non-limiting examples are: the total gas flow rate may be 14L/min, 14.5L/min, 15L/min, 15.5L/min, 16L/min, and the like.
In some embodiments, the oxidation reaction is carried out in an oxidation furnace with mechanical stirring, the stirring paddle is in an anchor type, and the stirring speed is 1r/min to 2r/min.
In some embodiments, the reinforcing fibers are one or a mixture of glass fibers, carbon fibers, or both.
In some embodiments, the wind turbine blade recovery method further comprises: and (3) cooling the pyrolysis carbonization tail gas in the step (2) to 100-150 ℃, recovering tar in the pyrolysis carbonization tail gas, and evacuating after the cooled pyrolysis carbonization tail gas is adsorbed and purified by activated carbon. Non-limiting examples are: and (3) cooling the pyrolysis carbonization tail gas in the step (2) to 100 ℃, 110 ℃, 120 ℃, 135 ℃, 150 ℃ and the like.
In some embodiments, the cooling of the pyrolysis carbonization tail gas is performed in a cold trap, the temperature is reduced by heat exchange with normal temperature air, and tar in the pyrolysis carbonization tail gas is recovered. The recovered tar can be used as fuel. It can be understood that: the temperature of the pyrolysis carbonization tail gas at the outlet of the cold trap can be adjusted by controlling the flow ratio of the normal-temperature air to the pyrolysis carbonization tail gas.
FIG. 1 shows a recovery system of one embodiment of the method of the present invention, comprising:
the pyrolysis carbonization furnace is used for pyrolyzing and carbonizing the waste blades cut into blocks in an inert atmosphere;
and the oxidation furnace is used for oxidizing the carbonized products of the pyrolysis carbonization furnace.
It should be noted that the pyrolysis carbonization reaction and the oxidation reaction of the present invention are separately performed, and the reaction apparatus is not limited, and as a possible example, the pyrolysis carbonization is performed in a pyrolysis carbonization furnace and the oxidation reaction is performed in an oxidation furnace.
It can be understood that the pyrolysis carbonization reaction and the oxidation reaction can also be carried out in the same equipment, and only the pyrolysis carbonization reaction stage is required to be controlled at the temperature of 280-320 ℃ for 1-2 h under the inert atmosphere, and the oxidation reaction stage is controlled at the temperature of 390-420 ℃ for 1-2 h under the oxygen-containing atmosphere.
In some embodiments, the recovery system further comprises a cold trap (schematically configured as shown in fig. 2) and an activated carbon adsorption column:
the cold trap comprises a hollow cavity and a jacket sleeved outside the hollow cavity, coolant air flows through the jacket, a detachable sealing cover is arranged on the hollow cavity, an air inlet pipe and an air outlet pipe are arranged on the sealing cover, one end of the air inlet pipe is connected with a tail gas outlet of the pyrolysis carbonization furnace through a pipeline, the other end of the air inlet pipe extends to the bottom of the hollow cavity, one end of the air outlet pipe is located at the upper position in the hollow cavity, and the other end of the air outlet pipe extends out of the sealing cover and is connected with a gas inlet of the activated carbon adsorption tower.
It can be understood that: and the pyrolysis carbonization tail gas exhausted from the cold trap is subjected to activated carbon adsorption to remove atmospheric pollutants and then is exhausted from an air outlet of the activated carbon adsorption tower. The tail gas of the oxidation furnace is mainly carbon dioxide and can be directly exhausted.
The following are non-limiting examples of the present invention and comparative examples. It should be noted that: the following comparative example scheme is not prior art, is provided only for comparison with the example scheme, and is not limiting to the invention.
The wind power blades treated in the embodiments 1 to 10 and the comparative examples 1 to 3 of the invention are glass fiber reinforced epoxy resin composite blades.
The recovery effects of examples 1 to 10 of the present invention and comparative examples 1 to 3 were evaluated by the resin residue ratio of the recovered fibers and the strength retention ratio of the recovered fibers.
The content of resin in the recycled fiber was analyzed using a Mettler Toledo type thermogravimetric analyzer, and the lower the content, the more sufficient the resin degradation in the blade.
The tensile strength of the fibers was measured using a LLY-06E type tensile tester, and the ratio of the tensile strength to the fibril strength represents the strength retention of the recycled fibers, with greater retention indicating less effect of the degradation process on the recycled fibers.
Example 1
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at 280 ℃ for 1.5 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 12%, and after the reaction at the temperature of 400 ℃ for 1h, the reinforced fiber is recovered.
The strength retention of the recovered fiber was 94.5%, and the resin residue rate was 6%.
Example 2
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at the temperature of 300 ℃ for 1.5 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 12%, and after the reaction at the temperature of 400 ℃ for 1h, the reinforced fiber is recovered.
The strength retention of the recovered fiber was 94.1%, and the resin residue rate was 5%.
Example 3
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at 320 ℃ for 1.5 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 12%, and after the reaction at the temperature of 400 ℃ for 1h, the reinforced fiber is recovered.
The strength retention ratio of the recovered fiber was 93.9%, and the resin residue ratio was 4%.
Example 4
A wind power blade recovery method based on control of pyrolysis oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at the temperature of 300 ℃ for 1 hour to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 8%, and the reinforced fiber is recovered after the reaction is carried out for 1.2h at the temperature of 420 ℃.
The strength retention ratio of the recovered fiber was 93%, and the resin residue ratio was 4%.
Example 5
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at the temperature of 300 ℃ for 2 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 8%, and after the reaction is carried out for 1.5h at the temperature of 420 ℃, the reinforced fiber is recovered.
The strength retention ratio of the recovered fiber was 92.8%, and the resin residue ratio was 3.8%.
Example 6
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at 320 ℃ for 1 hour to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 16%, and the reinforced fiber is recovered after the reaction is carried out at the temperature of 390 ℃ for 2h.
The strength retention ratio of the recovered fiber was 96.2%, and the resin residue ratio was 5.8%.
Example 7
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks for 1 hour at the temperature of 320 ℃ in a nitrogen atmosphere to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 14%, and the reinforced fiber is recovered after the reaction is carried out at the temperature of 390 ℃ for 2h.
The strength retention ratio of the recovered fiber was 97.1%, and the resin residue ratio was 6.2%.
Example 8
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at 320 ℃ for 2 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 16%, and the reinforced fiber is recovered after the reaction is carried out at the temperature of 390 ℃ for 2h.
The strength retention ratio of the recovered fiber was 95.7%, and the resin residue ratio was 5.5%.
Example 9
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at 320 ℃ for 1.5 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 10%, and the reinforced fiber is recovered after the reaction is carried out for 2h at the temperature of 410 ℃.
The strength retention ratio of the recovered fiber was 92.8%, and the resin residue ratio was 4.6%.
Example 10
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at 320 ℃ for 1.5 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 10%, and after the reaction is carried out for 1.5h at the temperature of 420 ℃, the reinforced fiber is recovered.
The strength retention ratio of the recovered fiber was 93.1%, and the resin residue ratio was 4.6%.
Comparative example 1
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at 260 ℃ for 2 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 8%, and after the reaction is carried out for 1.5h at the temperature of 420 ℃, the reinforced fiber is recovered.
The strength retention of the recovered fiber was 93%, and the resin residue rate was 15.5%.
Comparative example 2
A wind power blade recovery method based on control of pyrolysis oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at the temperature of 300 ℃ for 1.5 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 6%, and after the reaction is carried out at the temperature of 400 ℃ for 1.3h, the reinforced fiber is recovered.
The strength retention ratio of the recovered fiber was 93.8%, and the resin residue ratio was 10.2%.
Comparative example 3
A wind power blade recovery method based on control of pyrolytic oxidation comprises the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks; the dimensions are length by width =10cm by 10cm;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks in a nitrogen atmosphere at the temperature of 300 ℃ for 1.2 hours to obtain a carbonized product;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere (the total gas flow in an oxidation furnace is 15L/min), wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, the volume content of the oxygen is 18%, and after the reaction is carried out at the temperature of 400 ℃ for 1.2h, the reinforced fiber is recovered.
The strength retention of the recovered fiber was 80.6%, and the resin residue rate was 3.2%.
Specific parameters and recovery effects of the preparations of examples 1 to 10 and comparative examples 1 to 3 are detailed in table 1.
TABLE 1 EXAMPLES 1 TO 10 AND COMPARATIVE EXAMPLES 1 TO 3 RELATED PROCESS PARAMETERS AND RECOVERY EFFECTS
As can be seen from table 1, when the pyrolysis carbonization temperature is too low, sufficient carbonization cannot be performed, and when the oxygen content in the oxidizing atmosphere is too low, sufficient oxidation cannot be performed, the resin residue in the recovered fiber is high. The oxygen content in the oxidizing atmosphere is too high, the heat damage to the recycled fiber is obviously increased, and the strength retention rate of the fiber is obviously reduced.
Therefore, the embodiment of the invention carbonizes the blade in the inert atmosphere of 280-320 ℃, and efficiently oxidizes the carbonized product under the conditions of 8-16% of oxygen volume content and 390-420 ℃. Namely, under the condition of the embodiment of the invention, the wind power blade is fully carbonized and oxidized, and then high-quality recycled fiber is obtained.
Embodiments 1 to 10 of the present invention show conditions of a pyrolysis carbonization reaction and an oxidation reaction of a wind turbine blade, and it can be understood that, in the recovery method of the wind turbine blade in embodiments 1 to 10, the pyrolysis carbonization tail gas in step (2) may be cooled to, for example, 120 ℃ (performed in a cold trap, tar in the pyrolysis carbonization tail gas may be recovered through the cold trap), and the cooled pyrolysis carbonization tail gas is purified by activated carbon adsorption and then evacuated (performed in an activated carbon adsorption tower). The oxidation tail gas is mainly carbon dioxide and can be directly exhausted.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A wind power blade recovery method based on control of pyrolytic oxidation is characterized by comprising the following steps:
(1) Cutting the waste wind power blade with the metal component removed into blocks;
(2) Pyrolyzing and carbonizing the waste wind power blades cut into blocks for 1-2 h at 280-320 ℃ in an inert atmosphere to obtain a carbonized product, wherein the inert atmosphere is nitrogen, argon or helium;
(3) And (3) carrying out oxidation reaction on the carbonized product in an oxygen-containing atmosphere at the temperature of 390-420 ℃ for 1-2 h, and recovering the reinforced fiber after the reaction is finished.
2. The wind power blade recovery method based on control of pyrolytic oxidation according to claim 1, wherein the oxygen-containing atmosphere consists of nitrogen and oxygen, and the volume content of oxygen is 8% -16%.
3. The wind power blade recovery method based on control of pyrolytic oxidation according to claim 2, wherein the volume content of oxygen in the oxygen-containing atmosphere is 10% -12%.
4. The wind power blade recovery method based on control of pyrolytic oxidation according to claim 1, wherein the oxidation reaction is carried out in an oxidation furnace with mechanical stirring, the stirring paddle is in anchor type, and the stirring speed is 1r/min to 2r/min.
5. The wind power blade recovery method based on control of pyrolytic oxidation according to claim 1, wherein the inert atmosphere is nitrogen atmosphere.
6. The wind power blade recovery method based on control of pyrolytic oxidation according to claim 1, wherein the reinforcing fiber is one or a mixture of glass fiber and carbon fiber.
7. The wind power blade recovery method based on control of pyrolytic oxidation according to claim 1, wherein the wind power blade recovery method further comprises: and (3) cooling the pyrolysis carbonization tail gas in the step (2) to 100-150 ℃, recovering tar in the pyrolysis carbonization tail gas, and evacuating the cooled pyrolysis carbonization tail gas after the pyrolysis carbonization tail gas is adsorbed and purified by activated carbon.
8. The wind power blade recovery method based on control of pyrolytic oxidation according to claim 7, wherein the cooling of the pyrolytic carbonized tail gas is performed in a cold trap, and the tar in the pyrolytic carbonized tail gas is recovered by performing heat exchange with normal temperature air to cool the pyrolytic carbonized tail gas.
9. The method for recovering the wind power blade based on the control of the pyrolytic oxidation according to claim 1, wherein the sizes of the waste wind power blade cut into blocks are as follows: the length is less than or equal to 20cm, and the width is less than or equal to 20cm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116274253A (en) * | 2023-05-17 | 2023-06-23 | 国能龙源环保有限公司 | Method for recycling waste wind power blades |
| CN116274307A (en) * | 2023-05-17 | 2023-06-23 | 国能龙源环保有限公司 | Method for recycling waste wind power blades |
| CN117025274A (en) * | 2023-10-08 | 2023-11-10 | 国能龙源环保有限公司 | Method for preparing solid fuel by using waste carbon fiber wind power blades |
-
2022
- 2022-10-20 CN CN202211289509.3A patent/CN115846376A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116274253A (en) * | 2023-05-17 | 2023-06-23 | 国能龙源环保有限公司 | Method for recycling waste wind power blades |
| CN116274307A (en) * | 2023-05-17 | 2023-06-23 | 国能龙源环保有限公司 | Method for recycling waste wind power blades |
| CN116274253B (en) * | 2023-05-17 | 2023-08-11 | 国能龙源环保有限公司 | Method for recycling waste wind power blades |
| CN117025274A (en) * | 2023-10-08 | 2023-11-10 | 国能龙源环保有限公司 | Method for preparing solid fuel by using waste carbon fiber wind power blades |
| CN117025274B (en) * | 2023-10-08 | 2023-12-26 | 国能龙源环保有限公司 | Method for preparing solid fuel by using waste carbon fiber wind power blades |
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