A continuous self-powered pyrolysis recovery system and method for retired fan blades

Abstract

The present invention provides a continuous self-powered pyrolysis and recovery system and method for retired fan blades, wherein the continuous self-powered pyrolysis and recovery system for retired fan blades includes a retired fan blade pyrolysis system, a pyrolysis oil and gas combustion system and a waste heat recovery system, the retired fan blade pyrolysis system includes a feed bin, a press bin, a pyrolysis chamber, a gasification chamber, a cooling chamber and a discharge bin arranged in sequence; the pyrolysis oil and gas combustion system includes a combustion chamber, a main burner and an auxiliary burner, the pyrolysis chamber, the gasification chamber and the main burner are all arranged in the combustion chamber, and the pyrolysis oil and gas discharge pipe of the pyrolysis chamber is respectively connected to the main burner and the auxiliary burner; the waste heat recovery system includes a cooling chamber heat exchanger and a flue gas heat exchanger, and the combustion chamber and the auxiliary burner are respectively connected to the high-temperature flue gas inlet of the flue gas heat exchanger through a flue gas duct. The present invention can realize the continuous operation of fan blade pyrolysis, glass fiber decarbonization and glass fiber cooling processes, and can realize self-power after the pyrolysis reaction is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of pyrolysis recovery of retired fan blades, and in particular to a continuous self-powered pyrolysis recovery system and method for retired fan blades. Background Art

[0002] my country's wind power is developing rapidly, and the market is huge. The service life of wind turbines is generally 20 to 25 years. With the accelerated development of my country's wind power, the capacity of old wind turbines that have reached the end of their service life will usher in explosive growth. In the next 5 to 10 years, a large number of old wind turbines in China's wind power market will reach their design life. 80% to 90% of the materials in retired wind turbines can be recycled and the process is mature, but the blades of retired wind turbines are made of glass fiber reinforced thermosetting resin-based composite materials, which cannot be naturally degraded and are difficult to recycle.

[0003] Glass fiber reinforced composite materials are thermosetting cross-linked polymer materials that cannot be remelted and reshaped. The recycling methods of discarded fan blades mainly include mechanical recycling, chemical recycling and pyrolysis recycling. Among them, pyrolysis recycling technology is simple and economical, and has the greatest development potential. The Chinese invention patent with publication number CN115780482A discloses a method for recycling retired fan blades, which uses a crushed material oscillation pyrolysis method to treat the fan blades, and uses acid washing to recover glass fibers. The Chinese invention patent with publication number CN113351620A discloses a method for processing and recovering high-quality fuel and glass fibers from waste fan blades. The method requires crushing the fan blades to separate the resin and glass fibers. The Chinese invention patent with publication number CN116001144A discloses a method and system for recycling waste fan blades, which obtains glass fibers by crushing the blades, pyrolyzing the crushed materials, and calcining the solid products. The Chinese invention patent with publication number CN114656985A discloses a high-temperature nitrogen pyrolysis treatment and recovery method for retired fan blades, and the Chinese invention patent with publication number CN114653729B discloses a vacuum pyrolysis treatment and recovery method for retired fan blades. Both methods require the fan blades to be crushed, and the surface of the recovered fiber is coated with pyrolytic carbon, which is difficult to separate further. The Chinese invention patent with publication number CN115739929A ​​discloses a method for pyrolysis recovery of glass fiber from retired fan blades and the resulting regenerated glass fiber. The Chinese invention patent with publication number CN115716716A discloses a method for pyrolysis recovery of high-quality glass fiber from retired fan blades, but both methods require the fan blades to be crushed, and the atmosphere needs to be switched for intermittent operation, which is not conducive to continuous production. The Chinese invention patent with publication number CN116515509A discloses a device and method for thermal conversion recovery of waste fan blade glass fiber. Before pyrolysis, the blades need to be cut into particles and washed and dried.

[0004] It can be seen that the existing fan blade pyrolysis recovery method has high requirements on feed size, cannot meet the continuous production needs, and cannot achieve self-power supply in the pyrolysis process. Accordingly, the present invention provides a continuous self-powered retired fan blade pyrolysis recovery system and method. Summary of the invention

[0005] The first purpose of the present invention is to provide a continuous self-powered pyrolysis and recovery system for retired fan blades, which has high adaptability to the size of retired fan blades, can realize continuous operation of fan blade pyrolysis, glass fiber decarbonization, and glass fiber cooling processes, and can achieve self-power after the pyrolysis reaction is stabilized.

[0006] The second object of the present invention is to provide a continuous self-powered pyrolysis recovery method for retired wind turbine blades.

[0007] The present invention provides a continuous self-powered pyrolysis and recovery system for retired fan blades, comprising a retired fan blade pyrolysis system, a pyrolysis oil and gas combustion system and a waste heat recovery system, wherein the retired fan blade pyrolysis system comprises a feed bin, a pressing bin, a pyrolysis chamber, a gasification chamber, a cooling chamber and a discharge bin which are arranged in sequence; the pyrolysis oil and gas combustion system comprises a combustion chamber, a main burner and an auxiliary burner, wherein the pyrolysis chamber, the gasification chamber and the main burner are all arranged in the combustion chamber, the auxiliary burner is arranged outside the combustion chamber, the pyrolysis chamber is provided with a pyrolysis oil and gas exhaust pipe, and the pyrolysis oil and gas exhaust pipe is respectively connected to the main burner and the auxiliary burner; the waste heat recovery system comprises a cooling chamber heat exchanger and a flue gas heat exchanger, wherein the cooling chamber heat exchanger is arranged in the cooling chamber, and the combustion chamber and the auxiliary burner are respectively connected to the high-temperature flue gas inlet of the flue gas heat exchanger through a flue gas pipe.

[0008] According to a continuous self-powered pyrolysis and recovery system for retired fan blades provided by the present invention, the combustion chamber is connected to the high-temperature flue gas inlet of the flue gas heat exchanger through a high-temperature flue gas main pipeline, and the auxiliary burner is connected to the high-temperature flue gas inlet of the flue gas heat exchanger through an auxiliary flue gas pipeline; the high-temperature flue gas main pipeline is connected to the near-pyrolysis chamber end of the pressing bin through a first flue gas branch pipeline, and the far-pyrolysis chamber end of the pressing bin is connected to the high-temperature flue gas main pipeline through a first flue gas loop pipeline.

[0009] According to a continuous self-powered pyrolysis and recovery system for retired fan blades provided by the present invention, the low-temperature flue gas outlet of the flue gas heat exchanger is connected to a low-temperature smoke exhaust pipeline.

[0010] According to a continuous self-powered pyrolysis and recovery system for retired fan blades provided by the present invention, the high-temperature flue gas main pipeline is connected to the near-gasification chamber end of the cooling chamber through a second flue gas branch pipeline, and the far-gasification chamber end of the cooling chamber is connected to the low-temperature smoke exhaust pipeline through a second flue gas loop pipeline.

[0011] According to a continuous self-powered pyrolysis and recovery system for retired fan blades provided by the present invention, the cooling water inlet of the cooling chamber heat exchanger is connected to a first cooling water supply pipeline, and the cooling water inlet of the flue gas heat exchanger is connected to a second cooling water supply pipeline.

[0012] According to a continuous self-powered pyrolysis and recovery system for retired fan blades provided by the present invention, the cooling water inlet of the cooling chamber heat exchanger is connected to the first cooling water supply pipeline, and the cooling water outlet of the cooling chamber heat exchanger is connected to the cooling water inlet of the flue gas heat exchanger through a connecting pipeline.

[0013] A continuous self-powered pyrolysis and recovery system for retired wind turbine blades provided according to the present invention also includes a transmission mechanism, which sequentially passes through the feed bin, the pressing bin, the pyrolysis chamber, the gasification chamber, the cooling chamber and the discharge bin.

[0014] The present invention also provides a continuous self-powered pyrolysis and recovery method for retired fan blades, which uses the above-mentioned continuous self-powered pyrolysis and recovery system for retired fan blades, and specifically includes:

[0015] The fan blades are transported to the pressing bin through the feed bin and are preheated in the anaerobic environment of the pressing bin;

[0016] The preheated fan blades are transported to a pyrolysis chamber for anaerobic pyrolysis reaction, and the fan blades are pyrolyzed into pyrolysis oil gas and carbon-containing glass fibers; wherein the temperature of the pyrolysis chamber is 350-650° C., and the anaerobic pyrolysis reaction time is 20-50 minutes;

[0017] The carbon-containing glass fibers produced by the pyrolysis of the fan blades are transported to the gasification chamber, and decarbonization reaction is carried out in the anaerobic environment of the gasification chamber, and decarbonization is carried out under the action of the gasifying agent to form clean glass fibers; wherein the temperature of the gasification chamber is 300-600°C, and the decarbonization reaction time is 5-15 minutes; wherein the gasifying agent is water vapor or air or a mixture of the two, and the mass ratio of the gasifying agent to the pyrolysis fan blades is 10-30L / kg;

[0018] The clean glass fiber is transported to a cooling chamber, rapidly cooled in an anaerobic environment, and then enters a discharge bin to become recyclable glass fiber; wherein the outlet temperature of the cooling chamber is lower than 100°C.

[0019] According to a continuous self-powered pyrolysis and recovery method for retired fan blades provided by the present invention, the pyrolysis oil and gas generated by the pyrolysis of the fan blades are transported to the main burner for combustion, and the high-temperature flue gas generated by the combustion is used to provide heat for the pyrolysis reaction in the pyrolysis chamber and the gasification process in the gasification chamber.

[0020] According to a continuous self-powered pyrolysis recovery method for retired fan blades provided by the present invention, the anaerobic environment of the pressing bin, the pyrolysis chamber, the gasification chamber and the cooling chamber is maintained by the flue gas generated by the combustion of the main burner.

[0021] The continuous self-powered pyrolysis and recovery system for retired fan blades provided by the present invention, when in operation, the retired fan blades are passed from the feed bin into the pressing bin, preheated in the anaerobic environment in the pressing bin, and the preheated blades enter the pyrolysis chamber, anaerobic pyrolysis to form pyrolysis oil gas and carbon-containing glass fibers, wherein the carbon-containing fibers produced by the pyrolysis enter the gasification chamber, are decarbonized under the action of the gasifier to form clean glass fibers, and the clean glass fibers enter the cooling chamber, are rapidly cooled in the anaerobic environment, and enter the discharge bin to become recyclable glass fibers; wherein the pyrolysis oil gas produced by the pyrolysis enters the main burner and burns to generate high-temperature flue gas, which provides heat for the pyrolysis process in the pyrolysis chamber and the gasification process in the gasification chamber. Therefore, the present invention has a high adaptability to the size of retired fan blades, and can enter the pyrolysis recovery system for processing without cutting or after rough cutting. It can also realize the continuous operation of fan blade pyrolysis, glass fiber decarbonization, and glass fiber cooling processes. After the pyrolysis reaction is stable, external energy supply is no longer required. The pyrolysis oil and gas generated by combustion pyrolysis can provide heat for the pyrolysis process and gasification process, thereby realizing self-energy supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of a continuous self-powered pyrolysis and recovery system for retired fan blades according to the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the continuous self-powered pyrolysis recovery system for retired fan blades after the transmission mechanism is installed.

[0025] Description of reference numerals:

[0026] 1. Feed bin; 2. Press bin; 3. Pyrolysis chamber; 4. Gasification chamber; 5. Main burner; 6. Combustion chamber; 7. Cooling chamber; 8. Discharge bin; 9. Auxiliary burner; 10. Cooling chamber heat exchanger; 11. Flue gas heat exchanger. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1 As shown, the continuous self-powered pyrolysis and recovery system for retired fan blades of the embodiment of the present invention includes a retired fan blade pyrolysis system, a pyrolysis oil and gas combustion system and a waste heat recovery system. The retired fan blade pyrolysis system includes a feed bin 1, a press bin 2, a pyrolysis chamber 3, a gasification chamber 4, a cooling chamber 7 and a discharge bin 8 arranged in sequence. The pyrolysis oil and gas combustion system includes a combustion chamber 6, a main burner 5 and an auxiliary burner 9. The pyrolysis chamber 3, the gasification chamber 4 and the main burner 5 are all arranged in the combustion chamber 6, and the auxiliary burner 9 is arranged outside the combustion chamber 6. The pyrolysis chamber 3 is provided with a pyrolysis oil and gas discharge pipe, which is respectively connected to the main burner 5 and the auxiliary burner 9. The waste heat recovery system includes a cooling chamber heat exchanger 10 and a flue gas heat exchanger 11. The cooling chamber heat exchanger 10 is arranged in the cooling chamber 7. The combustion chamber 6 and the auxiliary burner 9 are respectively connected to the high-temperature flue gas inlet of the flue gas heat exchanger 11 through a flue gas pipeline.

[0031] During operation, the retired fan blades are passed from the feed bin 1 to the pressing bin 2, where they are preheated in the anaerobic environment of the pressing bin 2. The preheated blades enter the pyrolysis chamber 3, where they are anaerobically pyrolyzed into pyrolysis oil gas and carbon-containing glass fibers. The carbon-containing fibers produced by the pyrolysis enter the gasification chamber 4, where they are decarbonized under the action of the gasifier to form clean glass fibers. The clean glass fibers enter the cooling chamber 7, where they are rapidly cooled in the anaerobic environment and enter the discharge bin 8 to become recyclable glass fibers. The pyrolysis oil gas produced by the pyrolysis enters the main burner 5 and burns to produce high-temperature flue gas, which provides heat for the pyrolysis process in the pyrolysis chamber 3 and the gasification process in the gasification chamber 4. The arrangement of the cooling chamber heat exchanger 10 in the cooling chamber 7 provides a rapid cooling environment for the glass fibers and recovers low-quality energy. The flue gas heat exchanger 11 reduces the exhaust temperature of the flue gas, reduces exhaust losses, and further recovers energy.

[0032] Therefore, the continuous self-powered pyrolysis and recovery system for retired fan blades of the embodiment of the present invention can process retired fan blades into glass fibers for recycling. The recycling process is harmless and has low requirements on the size of retired fan blades. The retired fan blades have stronger size adaptability and can enter the pyrolysis and recovery system for processing without cutting or after rough cutting. Moreover, it can realize the continuous operation of fan blade pyrolysis, glass fiber decarbonization, and glass fiber cooling processes. After the pyrolysis reaction is stable, external energy supply is no longer required. The pyrolysis oil and gas generated by combustion pyrolysis can provide heat for the pyrolysis process and gasification process, thereby realizing self-power supply.

[0033] In some embodiments of the present invention, the combustion chamber 6 is connected to the high-temperature flue gas inlet of the flue gas heat exchanger 11 through the high-temperature flue gas main pipeline, and the auxiliary burner 9 is connected to the high-temperature flue gas inlet of the flue gas heat exchanger 11 through the auxiliary flue gas pipeline. Among them, the low-temperature flue gas outlet of the flue gas heat exchanger 11 is connected to the low-temperature exhaust pipeline. That is, the pyrolysis oil and gas produced by pyrolysis mainly enter the main burner 5, and the excess pyrolysis oil and gas can enter the auxiliary burner 9 for combustion. The high-temperature flue gas generated by the combustion of the auxiliary burner 9 and the high-temperature flue gas generated by the combustion of the main burner 5 enter the flue gas heat exchanger 11 together, and the flue gas is discharged through the low-temperature exhaust pipeline after the heat is recovered.

[0034] Specifically, the pyrolysis chamber 3 and the gasification chamber 4 operate at a slightly positive pressure under the action of the pyrolysis gas to produce an anaerobic environment. The high-temperature flue gas main pipeline is connected to the near-pyrolysis chamber end of the pressurizing bin 2 through the first flue gas branch pipeline, and the far-pyrolysis chamber end of the pressurizing bin 2 is connected to the high-temperature flue gas main pipeline through the first flue gas loop pipeline. That is, part of the high-temperature flue gas is extracted through the first flue gas branch pipeline and supplied to the near-pyrolysis chamber end of the pressurizing bin 2, and returned to the high-temperature flue gas main pipeline from the far-pyrolysis chamber end of the pressurizing bin 2. The high-temperature flue gas flows through the near-pyrolysis chamber end of the pressurizing bin 2 to the far-pyrolysis chamber end of the pressurizing bin 2, so as to form an anaerobic environment in the pressurizing bin 2 and complete the preheating process of the fan blades. At the same time, the anaerobic environment of the pressurizing bin 2 blocks the entry of air to achieve the maintenance of the anaerobic environment in the pyrolysis chamber 3 and the gasification chamber 4.

[0035] Specifically, the high-temperature flue gas main pipeline is connected to the end near the gasification chamber of the cooling chamber 7 through the second flue gas branch pipeline, and the end far from the gasification chamber of the cooling chamber 7 is connected to the low-temperature exhaust pipeline through the second flue gas loop pipeline. That is, part of the high-temperature flue gas is extracted through the second flue gas branch pipeline and supplied to the end near the gasification chamber of the cooling chamber 7, and returned to the low-temperature exhaust pipeline from the end far from the gasification chamber of the cooling chamber 7, thereby forming an anaerobic environment in the cooling chamber 7.

[0036] In some embodiments of the present invention, the cooling water inlet of the cooling chamber heat exchanger 10 is connected to the first cooling water supply pipeline, and the cooling water inlet of the flue gas heat exchanger 11 is connected to the second cooling water supply pipeline. That is, the cooling water of the cooling chamber heat exchanger 10 and the flue gas heat exchanger 11 can be supplied separately, and the cooling chamber heat exchanger 10 and the flue gas heat exchanger 11 respectively use high-temperature flue gas and cooling water for heat exchange, and the cooling chamber heat exchanger 10 and the flue gas heat exchanger 11 can respectively produce hot water for users, thereby realizing energy recovery and utilization.

[0037] In other embodiments of the present invention, the cooling water inlet of the cooling chamber heat exchanger 10 is connected to the first cooling water supply pipeline, and the cooling water outlet of the cooling chamber heat exchanger 10 is connected to the cooling water inlet of the flue gas heat exchanger 11 through a connecting pipeline. That is, after the cooling water of the cooling chamber heat exchanger 10 exchanges heat with the high-temperature flue gas, it is passed into the flue gas heat exchanger 11 to continue to exchange heat with the high-temperature flue gas, and steam can be produced through the flue gas heat exchanger 11 for users to use, thereby realizing energy recovery and utilization. Among them, the cooling water is heated from 20°C to 60°C in the cooling chamber heat exchanger 10, and then heated from 60°C to 110°C in the flue gas heat exchanger 11, so the flue gas heat exchanger 11 can produce steam for users to use.

[0038] The cooling chamber heat exchanger 10 and the flue gas heat exchanger 11 are both indirect heat exchangers. As can be seen from the above, the cooling water flow of the cooling chamber heat exchanger 10 and the flue gas heat exchanger 11 can be arranged continuously or separately according to actual conditions.

[0039] like Figure 2As shown, in some embodiments of the present invention, the continuous self-powered retired fan blade pyrolysis recovery system further includes a transmission mechanism 12, which sequentially passes through the feed bin 1, the pressing bin 2, the pyrolysis chamber 3, the gasification chamber 4, the cooling chamber 7 and the discharge bin 8. The transmission mechanism 12 can be a crawler transmission mechanism, which is used to realize the continuous transportation of solid materials in the fan blade pyrolysis recovery process.

[0040] Specifically, the feed bin 1 is provided with a first smoke damper, and when the feed bin 1 is fed, the first smoke damper is closed to block the smoke. After the feed bin 1 is fed, the first smoke damper is opened, and the material in the feed bin 1 enters the pressing bin 2.

[0041] Specifically, the pressing bin 2 is provided with a second smoke baffle for limiting the flow of smoke into the pyrolysis chamber 3 .

[0042] Specifically, the combustion chamber 6 adopts an existing horizontal combustion chamber, which is composed of a furnace shell, a refractory lining, a protective rain cover and other structures.

[0043] Specifically, the outlet temperature of the cooling chamber 7 is 80° C., and smoke one-way flow baffles are provided at both ends of the cooling chamber 7 .

[0044] Specifically, the slight negative pressure in the discharge bin 8 can draw a small amount of smoke to the low-temperature smoke exhaust pipeline for discharge.

[0045] Specifically, the main burner 5 and the auxiliary burner 9 are both gas burners, which input pyrolysis oil gas into the air flow to form the expected controllable flame characteristics, and the flame layer is controllably expanded in the radial and axial directions.

[0046] Specifically, the cooling chamber heat exchanger 10 and the flue gas heat exchanger 11 are both finned heat exchangers, where the flue gas flows through the shell side and the feed water flows through the tube side. The fins are arranged on the shell side, which strengthens the heat exchange on the flue gas side and improves the heat transfer level of the entire heat exchanger.

[0047] On the other hand, the present invention also provides a continuous self-powered pyrolysis recovery method for retired fan blades, which adopts the continuous self-powered pyrolysis recovery system for retired fan blades of the above embodiment, and specifically includes the following steps:

[0048] The fan blades are transported to the pressing bin 2 through the feed bin 1 and are preheated in the anaerobic environment of the pressing bin 2.

[0049] The preheated fan blades are transported to the pyrolysis chamber 3 for anaerobic pyrolysis reaction, and the fan blades are pyrolyzed into pyrolysis oil gas and carbon-containing glass fiber. The temperature of the pyrolysis chamber 3 is constant at 350-650°C, and the anaerobic pyrolysis reaction time is 20-50 minutes.

[0050] The carbon-containing glass fiber produced by the pyrolysis of the fan blade is transported to the gasification chamber 4, where a decarbonization reaction is carried out in the anaerobic environment of the gasification chamber 4, and the decarbonization is carried out under the action of the gasification agent to form clean glass fibers. The temperature of the gasification chamber 4 is 300-600°C, and the decarbonization reaction time is 5-15 minutes. The gasification agent is water vapor or air or a mixture of the two, and the mass ratio of the gasification agent to the pyrolysis fan blade is 10-30L / kg.

[0051] The clean glass fiber is transported to the cooling chamber 7, and after being rapidly cooled in an anaerobic environment, it enters the discharge bin 8 to become recyclable glass fiber. The outlet temperature of the cooling chamber 7 is lower than 100°C.

[0052] In some embodiments of the present invention, the pyrolysis oil and gas generated by the pyrolysis of the fan blades is transported to the main burner 5 for combustion, and the high-temperature flue gas generated by the combustion is used to provide heat for the pyrolysis reaction in the pyrolysis chamber 3 and the gasification process in the gasification chamber 4.

[0053] In some embodiments of the present invention, during the furnace startup stage, inert gas such as water vapor is introduced into the pressurizing bin 2, the pyrolysis chamber 3, the gasification chamber 4, the cooling chamber 7, and the discharge bin 8 to create an anaerobic environment.

[0054] In some embodiments of the present invention, after the pyrolysis reaction is stabilized, the anaerobic environment of the pressing chamber 2, the pyrolysis chamber 3, the gasification chamber 4 and the cooling chamber 7 can be maintained by the flue gas generated by the combustion of the main burner 5.

[0055] 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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuous self-powered pyrolysis recovery system for retired wind turbine blades, characterized in that: It includes a pyrolysis system for retired fan blades, a pyrolysis oil and gas combustion system and a waste heat recovery system. The pyrolysis system for retired fan blades includes a feed bin, a pressing bin, a pyrolysis chamber, a gasification chamber, a cooling chamber and a discharge bin which are arranged in sequence; the pyrolysis oil and gas combustion system includes a combustion chamber, a main burner and an auxiliary burner. The pyrolysis chamber, the gasification chamber and the main burner are all arranged in the combustion chamber, the auxiliary burner is arranged outside the combustion chamber, and the pyrolysis chamber is provided with a pyrolysis oil and gas exhaust pipe, which is respectively connected to the main burner and the auxiliary burner; the waste heat recovery system includes a cooling chamber heat exchanger and a flue gas heat exchanger. The cooling chamber heat exchanger is arranged in the cooling chamber, and the combustion chamber and the auxiliary burner are respectively connected to the high-temperature flue gas inlet of the flue gas heat exchanger through a flue gas pipeline; The combustion chamber is connected to the high-temperature flue gas inlet of the flue gas heat exchanger through a high-temperature flue gas main pipeline, and the auxiliary burner is connected to the high-temperature flue gas inlet of the flue gas heat exchanger through an auxiliary flue gas pipeline; the high-temperature flue gas main pipeline is connected to the near-pyrolysis chamber end of the pressurizing bin through a first flue gas branch pipeline, and the far-pyrolysis chamber end of the pressurizing bin is connected to the high-temperature flue gas main pipeline through a first flue gas loop pipeline; The low-temperature flue gas outlet of the flue gas heat exchanger is connected to a low-temperature smoke exhaust pipeline; The high-temperature flue gas main pipeline is connected to the end of the cooling chamber near the gasification chamber through the second flue gas branch pipeline, and the end of the cooling chamber far from the gasification chamber is connected to the low-temperature smoke exhaust pipeline through the second flue gas loop pipeline; The cooling water inlet of the cooling chamber heat exchanger is connected to the first cooling water supply pipeline, and the cooling water outlet of the cooling chamber heat exchanger is connected to the cooling water inlet of the flue gas heat exchanger through a connecting pipeline; wherein the cooling water is heated from 20°C to 60°C in the cooling chamber heat exchanger, and then heated from 60°C to 110°C in the flue gas heat exchanger; It also includes a transmission mechanism, which sequentially passes through the feed bin, the pressing bin, the pyrolysis chamber, the gasification chamber, the cooling chamber and the discharge bin.

2. A continuous self-powered pyrolysis recovery method for retired fan blades, characterized in that: The continuous self-powered pyrolysis recovery system for retired wind turbine blades as claimed in claim 1 specifically comprises: The fan blades are transported to the pressing bin through the feed bin and are preheated in the anaerobic environment of the pressing bin; The preheated fan blades are transported to a pyrolysis chamber for anaerobic pyrolysis reaction, and the fan blades are pyrolyzed into pyrolysis oil gas and carbon-containing glass fibers; wherein the temperature of the pyrolysis chamber is 350-650° C., and the anaerobic pyrolysis reaction time is 20-50 minutes; The carbon-containing glass fibers produced by the pyrolysis of the fan blades are transported to the gasification chamber, and decarbonization reaction is carried out in the anaerobic environment of the gasification chamber, and decarbonization is carried out under the action of the gasifying agent to form clean glass fibers; wherein the temperature of the gasification chamber is 300-600°C, and the decarbonization reaction time is 5-15 minutes; wherein the gasifying agent is water vapor or air or a mixture of the two, and the mass ratio of the gasifying agent to the pyrolysis fan blades is 10-30L / kg; The clean glass fiber is transported to the cooling chamber, rapidly cooled in an anaerobic environment, and then enters the discharge bin to become recyclable glass fiber; wherein the outlet temperature of the cooling chamber is lower than 100°C; The pyrolysis oil and gas generated by the pyrolysis of the fan blades are transported to the main burner for combustion. The high-temperature flue gas generated by the combustion is used to provide heat for the pyrolysis reaction in the pyrolysis chamber and the gasification process in the gasification chamber. The oxygen-free environments of the pressing chamber, the pyrolysis chamber, the gasification chamber and the cooling chamber are maintained by the flue gas generated by the combustion of the main burner.

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