System and method for decommissioning fan blades based on reheated steam pyrolysis

Abstract

The invention provides a system and method for pyrolyzing retired fan blades based on reheated steam, the system comprises a pyrolysis assembly, the pyrolysis assembly comprises a pyrolysis piece, and the retired fan blades are placed in the pyrolysis piece after being disassembled and broken; a heat source provided by a power plant coupled with the pyrolysis assembly is used for providing a pyrolysis heat source required by the pyrolysis of the fan blade for the pyrolysis piece, and a pyrolysis product is recycled; a heat source provided by the power plant comprises steam with the temperature 50-100 DEG C higher than the pyrolysis temperature of the fan blades. The power plant extracted steam with the matched temperature is used as a high-temperature heat source for pyrolysis of the retired fan blade, so that efficient use of energy is achieved, the power plant extracted steam is used for replacing an existing direct combustion high-temperature heat source, and the thermodynamic second efficiency of the whole system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pyrolysis of decommissioned wind turbine blades, and in particular to a system and method for pyrolysis of decommissioned wind turbine blades based on reheat steam. BACKGROUND

[0002] With the rapid development of wind power technology, a large number of wind turbine generators are installed and used. However, the blades of the wind turbine generators are usually made of composite materials, which have very high durability and strength, making it difficult to degrade and recycle decommissioned wind turbine blades, which becomes an environmental problem. At present, the main methods for processing decommissioned wind turbine blades include landfill, incineration and partial recycling. However, these methods have their own shortcomings. For example, landfill will occupy a large amount of land resources, and composite materials are difficult to degrade; incineration will produce harmful gases and pollute the environment; in terms of partial recycling, the most popular is to use pyrolysis technology. Pyrolysis technology is a process of decomposing organic matter into small molecular compounds under anaerobic conditions at high temperature. Pyrolysis technology can effectively decompose the composite materials in decommissioned wind turbine blades into recyclable fuels and chemicals.

[0003] The existing pyrolysis device uses high-carbon fuels (such as coal, coal gas) to directly combust high-temperature heat sources of 850-1300℃, and provides heat sources for the entire pyrolysis device. However, the temperature required for pyrolysis is 300-650℃, so using high-carbon fuels (such as coal, coal gas) to directly combust high-temperature heat sources will cause a large amount of waste and low second law of thermodynamics efficiency in the processing of decommissioned wind turbine blades. Waste, low second law of thermodynamics efficiency. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end, the purpose of the present application is to propose a system and method for pyrolysis of decommissioned wind turbine blades based on reheat steam. The present application uses temperature-matched power plant extraction steam as a high-temperature heat source for pyrolysis of decommissioned wind turbine blades, thereby achieving efficient use of energy.

[0005] To achieve the above-mentioned purpose, according to the first aspect of the present application, a system for pyrolysis of decommissioned wind turbine blades based on reheat steam is proposed, which comprises:

[0006] a pyrolysis assembly comprising a pyrolysis element, the decommissioned wind turbine blades are placed in the pyrolysis element after being broken and crushed, and a heat source provided by a power plant coupled with the pyrolysis assembly is used to provide the pyrolysis element with a pyrolysis heat source required for pyrolysis of the wind turbine blades, and the pyrolysis product is recovered;

[0007] The heat source provided by the power plant includes steam with a temperature 50-100℃ higher than the pyrolysis temperature of the wind turbine blades.

[0008] In some embodiments, the heat source provided by the power plant comprises high pressure steam and / or medium pressure steam outputted by a high pressure cylinder and / or a medium pressure cylinder of a steam turbine.

[0009] In some embodiments, the pyrolysis assembly further comprises an upper feeding assembly and a lower feeding assembly located upstream and downstream of the pyrolysis component respectively; the upper feeding assembly is used to provide the disassembled and broken fan blades to the pyrolysis component; the lower feeding assembly is used to transfer the pyrolyzed fan blades to downstream.

[0010] In some embodiments, a driving chain plate is used in the upper feeding assembly, the pyrolysis component and the lower feeding assembly to realize the transfer of the fan blades.

[0011] In some embodiments, the disassembled and broken fan blades are placed on the driving chain plate and pass through a furnace door on one side of the pyrolysis component to be transferred into the pyrolysis component; the pyrolyzed fan blades pass through a furnace door on the other side of the pyrolysis component with the rotation of the driving chain plate.

[0012] In some embodiments, a radiation tube is arranged in the pyrolysis component; the radiation tube is located above the fan blades in the pyrolysis component and is connected with the heat source unit to receive the pyrolysis heat source to heat and pyrolyze the fan blades.

[0013] In some embodiments, an air outlet is arranged on the pyrolysis component.

[0014] According to a second aspect of the present application, a method for pyrolyzing decommissioned fan blades based on reheated steam is provided, which utilizes the system of any of the above embodiments to pyrolyze the decommissioned fan blades.

[0015] In some embodiments, the method comprises the following steps:

[0016] Assembling the system of any of the above embodiments;

[0017] Disassembling and breaking the decommissioned fan blades and placing them in the pyrolysis component; using the heat source provided by the power plant to provide the pyrolysis heat source required for the pyrolysis of the fan blades for the pyrolysis component; and recycling the pyrolysis products.

[0018] In some embodiments, the temperature for pyrolyzing the fan blades is 300-500℃; and the temperature of the steam provided by the power plant is 550-630℃.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The application mainly uses the power plant reheat steam as the heat source of the pyrolysis reaction of the pyrolysis assembly, and provides the heat required for the pyrolysis of the fan blade. Meanwhile, the specific extraction position of the power plant reheat steam can be flexibly controlled according to the heat source demand of the pyrolysis reactor, and the steam parameter position higher than the pyrolysis temperature of the fan blade by 50-100℃ is selected, so as to realize the energy quality matching of the power plant reheat steam and the pyrolysis assembly, and improve the overall energy quality utilization efficiency.

[0021] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the following description, including the accompanying drawings, in which:

[0023] Figure 1 is a structural schematic diagram of a system for pyrolyzing the retired fan blade based on the reheat steam according to an embodiment of the application;

[0024] Figure 2 is a flowchart of a method for pyrolyzing the retired fan blade based on the reheat steam according to an embodiment of the application;

[0025] In the figure, 1 is a driving chain plate, 2 is a furnace door, 3 is a pyrolysis furnace, 4 is a radiation pipe, 5 is an air outlet, 6 is a high-pressure cylinder of a steam turbine, 7 is a medium-pressure cylinder of a steam turbine, 8 is high-pressure steam, and 9 is medium-pressure steam. DETAILED DESCRIPTION

[0026] The embodiments of the application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation of the application. On the contrary, the embodiments of the application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

[0027] To achieve the above-mentioned purpose, according to a first aspect of the application, an ultra-low carbon emission retired fan blade pyrolysis system is provided Figure 1The process involves dismantling and crushing retired wind turbine blades from a pyrolysis assembly, placing them in a pyrolysis unit, and utilizing a heat source provided by a power plant coupled to the pyrolysis assembly as the pyrolysis heat source required for the pyrolysis of the wind turbine blades, while also recovering the pyrolysis products. In this embodiment, the pyrolysis unit can be a pyrolysis furnace 3. In some embodiments, the pyrolysis furnace 3 is equipped with an outlet 5. The dismantled and crushed retired wind turbine blades are placed in the pyrolysis furnace 3, where a heat source provided by the power plant is used to pyrolyze the dismantled and crushed retired wind turbine blades. The pyrolysis flue gas can be discharged from the outlet 5. The pyrolysis products of the wind turbine blades can be recovered during and after the pyrolysis process, improving the recycling efficiency of fuels and chemicals generated during pyrolysis.

[0028] The heat source provided by the power plant includes steam with a temperature 50-100°C higher than the pyrolysis temperature of the fan blades. In other words, the pyrolysis temperature of the fan blades is t1; the steam temperature provided by the power plant is t2; t2 is 50-100°C higher than t1, of which the pyrolysis temperature of the fan blades is 300-500°C; and the steam temperature provided by the power plant can be 550-630°C.

[0029] Related technologies use the direct combustion of high-carbon fuels (such as coal and coal gas) to generate a high-temperature heat source, providing heat for the entire pyrolysis unit. This not only increases processing costs but also results in significant costs, as existing pyrolysis units using high-carbon fuels (such as coal and coal gas) generate a high-temperature heat source of 850-1300℃, while the required pyrolysis temperature is 300-650℃. Wasteful and thermodynamically inefficient. Compared to related technologies, this application introduces power plant extracted steam as a heat source, including steam with a temperature 50-100°C higher than the pyrolysis temperature of the fan blades, to achieve energy-mass matching and improve the overall system efficiency. Efficiency. Therefore, this application uses power plant steam extraction to replace the existing direct combustion high-temperature heat source, improving the overall system's second thermodynamic efficiency, thereby solving the high efficiency problem caused by simply using direct high-temperature fuel combustion. loss.

[0030] In some embodiments, the heat source provided by the power plant includes high-pressure steam 8 and / or medium-pressure steam 9 output from the high-pressure cylinder 6 and / or the intermediate-pressure cylinder 7 of the steam turbine.

[0031] This application primarily uses power plant reheat steam (temperature 550-630℃, typical temperature 590℃) as the heat source for the pyrolysis reactor, providing heat to the entire pyrolysis unit and supplying the heat required for the pyrolysis of photovoltaic panels. Simultaneously, the specific steam extraction location can be flexibly controlled according to the heat source requirements of the pyrolysis reactor, selecting a steam parameter location 50-100℃ higher than the optimal pyrolysis temperature of the corresponding pyrolysis material. This includes heat sources provided by the power plant, such as high-pressure steam 8 output from the high-pressure cylinder 6 of the turbine, or medium-pressure steam 9 output from the intermediate-pressure cylinder 7 of the turbine, or a combination of both. This achieves energy-quality matching between the heat source and the pyrolysis reactor, improving overall energy-quality utilization efficiency.

[0032] In some embodiments, the pyrolysis assembly further includes a feeding assembly and a discharging assembly located upstream and downstream of the pyrolysis member, respectively; the feeding assembly is used to provide the broken and disassembled fan blades to the pyrolysis member; the discharging assembly transfers the pyrolyzed fan blades downstream.

[0033] For example, the pyrolysis assembly also includes a feeding assembly and a discharging assembly. The feeding assembly is located upstream of the pyrolysis unit and is used to provide the broken and disassembled fan blades to the pyrolysis unit. The discharging assembly is located downstream of the pyrolysis unit and transfers the pyrolyzed fan blades downstream. In some embodiments, both the feeding assembly and the discharging assembly utilize a drive chain plate 1 to achieve the transfer of the fan blades. That is, the feeding assembly, the pyrolysis unit, and the discharging assembly all utilize the drive chain plate 1 to achieve the transfer of the fan blades.

[0034] In the example, in the feeding assembly area, the disassembled and crushed fan blades are placed on the drive chain plate 1. After the fan blades are placed, the drive chain plate 1 is started to rotate, and the fan blades move with the drive chain plate until the drive chain plate 1 with the fan blades passes through the furnace door 2 on one side of the pyrolysis unit and transports the fan blades into the pyrolysis unit, at which point the drive chain plate 1 stops. After the fan blades have been pyrolyzed in the pyrolysis unit, the drive chain plate 1 rotates, and the pyrolyzed fan blades, along with the rotation of the drive chain plate 1, pass through the furnace door 2 on the other side of the pyrolysis unit and enter the unloading assembly area. That is, the drive chain plate 1 is used in the feeding assembly, the pyrolysis unit, and the unloading assembly to realize the transfer of fan blades.

[0035] In some embodiments, a radiant tube 4 is provided in the pyrolysis unit; the radiant tube 4 is located above the fan blades in the pyrolysis unit and is connected to the heat source unit to receive the pyrolysis heat source to heat the pyrolysis fan blades.

[0036] The pyrolysis unit is equipped with multiple radiant tubes 4, which are distributed above the fan blades in the pyrolysis unit. The radiant tubes 4 are connected to the heat source unit to receive the pyrolysis heat source to heat the pyrolysis fan blades.

[0037] According to the second aspect of this application, a method for decommissioning wind turbine blades based on reheat steam pyrolysis is proposed, such as... Figure 2 The system in any of the above embodiments is used to perform pyrolysis of decommissioned wind turbine blades.

[0038] In some embodiments, the following steps are included:

[0039] S1: Assemble the system in any of the above embodiments;

[0040] S2: The retired wind turbine blades are dismantled and crushed and placed in the pyrolysis unit. The heat source provided by the power plant is used to provide the pyrolysis heat source required for the pyrolysis of the wind turbine blades, and the pyrolysis products are recovered.

[0041] In some embodiments, the temperature of the pyrolysis of the fan blades is 300-500°C; the temperature of the steam provided by the power plant is 550-630°C.

[0042] In this embodiment, the system of any of the above embodiments is assembled, and the decommissioned wind turbine blades are disassembled and crushed and placed in the pyrolysis component. The heat source provided by the power plant, namely the steam provided by the power plant at a temperature of 550-630℃, is used to provide the pyrolysis heat source required for the pyrolysis of the wind turbine blades. The pyrolysis products are then recovered. The temperature of the pyrolysis of the wind turbine blades is 300-500℃.

[0043] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0044] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A system based on reheat steam pyrolysis of decommissioned wind turbine blades, characterized in that, It includes; A pyrolysis assembly includes a pyrolysis component. Decommissioned wind turbine blades are dismantled and crushed and placed in the pyrolysis component. A heat source provided by a power plant coupled to the pyrolysis assembly provides the pyrolysis heat source required for the pyrolysis of the wind turbine blades to the pyrolysis component, and the pyrolysis products are recovered. The heat source provided by the power plant includes steam with a temperature 50-100°C higher than the pyrolysis temperature of the fan blades.

2. The system according to claim 1, characterized in that, The heat source provided by the power plant includes high-pressure steam and / or medium-pressure steam output from the high-pressure cylinder and / or intermediate-pressure cylinder of the steam turbine.

3. The system according to claim 1 or 2, characterized in that, The pyrolysis assembly further includes a feeding assembly and a discharging assembly located upstream and downstream of the pyrolysis unit, respectively; the feeding assembly is used to provide the pyrolysis unit with the broken and disassembled fan blades; the discharging assembly rotates the pyrolyzed fan blades downstream.

4. The system according to claim 3, characterized in that, The feeding assembly, the pyrolysis component, and the unloading assembly all utilize drive chain plates to achieve the transfer of wind turbine blades.

5. The system according to claim 4, characterized in that, The broken fan blades are placed on the drive chain plate and passed through the furnace door on one side of the pyrolysis unit, and the fan blades are transported into the pyrolysis unit; the pyrolyzed fan blades are rotated with the drive chain plate and pass through the furnace door on the other side of the pyrolysis unit.

6. The system according to claim 4, characterized in that, The pyrolysis component is provided with a radiant tube; the radiant tube is located above the fan blades in the pyrolysis component, and is connected to the heat source unit to receive the pyrolysis heat source to heat and pyrolyze the fan blades.

7. The system according to claim 5, characterized in that, The pyrolysis component is provided with an air outlet.

8. A method for decommissioning wind turbine blades based on reheat steam pyrolysis, characterized in that, The system described in any one of claims 1-7 is used to perform pyrolysis of decommissioned wind turbine blades.

9. The method according to claim 8, characterized in that, Includes the following steps: Assemble the system according to any one of claims 1-7; The decommissioned wind turbine blades are disassembled and crushed, then placed in a pyrolysis chamber. The heat source provided by the power plant is used to provide the pyrolysis chamber with the heat source required for the pyrolysis of the wind turbine blades, and the pyrolysis products are recovered.

10. The method according to claim 8, characterized in that, The temperature at which the fan blades are pyrolyzed is 300-500℃; the temperature of the steam provided by the power plant is 550-630℃.

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