A device and method for processing retired wind turbine blades

Abstract

The embodiment of the present application discloses a method and device for processing retired wind turbine blades, wherein the processing device for retired wind turbine blades includes a grate, a steam turbine and a flue gas purification component. In the present application, a grate is used to process retired wind turbine blades. The combustion mode of the grate is fixed bed combustion, which has low requirements on the size of combustibles and does not require the blades to be crushed into a smaller particle size that satisfies fluidization. Therefore, the use of grate combustion can reduce the energy consumption in the cutting process of retired wind turbine blades; the heat generated by the combustion of retired wind turbine blades is exchanged with the water-cooled wall of the grate, and the generated steam drives the steam turbine to do work; the flue gas generated by the combustion of retired wind turbine blades is processed by a flue gas purification component to remove CO2, NOx, SO2, dioxins and dust in the flue gas. The processing device for retired wind turbine blades disclosed in the present application realizes the incineration of retired wind turbine blades, while making full use of the residual value of retired wind turbine blades and reducing pollution to the environment.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a device and method for processing retired wind turbine blades. Background Art

[0002] The blades put into operation in old wind farms have begun to be retired one after another. As of the end of 2019, the number of blade sets on display exceeded 135,000 sets. According to incomplete statistics, approximately 5,700 tons of blades were retired in 2018, and about 10,000 to 15,000 tons of blades will be retired in 2021. In the future, the number of retired blades will increase exponentially.

[0003] In the prior art, retired wind turbine blades are mostly recycled by stacking or burying, which causes environmental pollution.

[0004] Therefore, how to reduce the environmental pollution caused by the disposal of retired wind turbine blades has become a technical problem that needs to be urgently solved by those skilled in the art.

[0005] Application Contents

[0006] The present application proposes a device for processing retired wind turbine blades to reduce the pollution to the environment caused by processing retired wind turbine blades. The present application also proposes a method for processing retired wind turbine blades.

[0007] In order to achieve the above-mentioned purpose, the present application provides a device for processing retired wind turbine blades, comprising:

[0008] Grate, used to burn retired wind turbine blades,

[0009] The grate comprises a preheating grate, a combustion grate, a burnout grate, an ash collector and an economizer connected in sequence.

[0010] The preheating grate is used to preheat the retired wind turbine blades and remove moisture from the retired wind turbine blades.

[0011] The combustion grate is used to incinerate the retired wind turbine blades and form ash.

[0012] The burnout grate is used to burn the combustibles in the ash.

[0013] The ash collector is used to collect incombustible ash.

[0014] The economizer is arranged in the tail flue of the grate to absorb the heat in the flue gas;

[0015] A steam turbine, connected to the water-cooled wall of the grate, the steam turbine being capable of using the steam generated by the water-cooled wall to perform work;

[0016] Flue gas purification components, including SCR, air preheater, desulfurization tower, dust collector and CO2 collector,

[0017] The SCR is in communication with the economizer and is used to remove NOx from the flue gas;

[0018] An air preheater is in communication with the SCR, and the air preheater is in communication with the grate through an air supply pipeline, and is used for heating the air supplied to the grate;

[0019] The desulfurization tower is connected to the air preheater and is used to remove SO2 in the flue gas;

[0020] The dust collector is connected to the desulfurization tower, and a nozzle for spraying activated carbon shell particles is arranged in the pipeline connecting the dust collector and the desulfurization tower. The activated carbon particles are used to adsorb dioxins in the flue gas and to remove dust and activated carbon in the flue gas;

[0021] The CO2 collector is connected to the dust collector and is used to capture CO2 in the flue gas.

[0022] Preferably, the above-mentioned processing device for retired wind turbine blades further includes a condenser located between the steam turbine and the economizer.

[0023] Preferably, the above-mentioned processing device for retired wind turbine blades further comprises a steam-water separator, the inlet of the steam-water separator is connected to the economizer, and the steam separated by the steam-water separator is supplied to the water-cooled wall.

[0024] Preferably, in the above-mentioned processing device for retired wind turbine blades, the dust collector is an electrostatic dust collector.

[0025] Preferably, in the above-mentioned processing device for retired wind turbine blades, the air supply pipeline comprises:

[0026] A main air supply pipe, one end of which is connected to the air preheater, and the other end of which is connected to the combustion grate, and a first flow regulating valve is provided on the main air supply pipe;

[0027] a first air supply branch pipe, one end of which is connected to the main air supply pipe and the connection position is located upstream of the first flow regulating valve, and the other end of which is connected to the secondary air supply nozzle;

[0028] a second gas supply branch pipe, one end of which is connected to the main gas supply pipe, a second flow regulating valve is provided on the second gas supply branch pipe, and the other end of which is connected to the preheating grate;

[0029] A third gas supply branch pipe, one end of which is connected to the main gas supply pipe, a third flow regulating valve is provided on the third gas supply branch pipe, and the other end of which is connected to the burnout grate.

[0030] Preferably, in the above-mentioned processing device for retired wind turbine blades, the secondary air supply nozzle is arranged in the middle of the furnace of the grate, and there are multiple secondary air supply nozzles and they are located at the same height of the furnace.

[0031] Preferably, in the above-mentioned processing device for retired wind turbine blades, air supply nozzles are arranged below the preheating grate, the combustion grate and the burnout grate.

[0032] The air supply nozzle is a coaxial nozzle.

[0033] Preferably, in the above-mentioned processing device for retired wind turbine blades, a fuel nozzle is provided on the furnace of the grate for spraying fuel into the furnace to assist combustion.

[0034] A method for processing retired wind turbine blades, using the device for processing retired wind turbine blades described in the above scheme,

[0035] Includes steps:

[0036] S1. Preheating retired wind turbine blades and removing moisture from the retired wind turbine blades;

[0037] S2, burning the retired wind turbine blades to form ash;

[0038] S3, burning combustibles in the ash;

[0039] S4, collecting incombustible ash;

[0040] S5, using steam generated by burning the retired wind turbine blades to perform work;

[0041] S6, utilizing the heat in the flue gas generated by burning the retired wind turbine blades;

[0042] S7, removing NOx from the flue gas;

[0043] S8, removing SO2 from the flue gas;

[0044] S9, adsorbing dioxins in the flue gas and removing dust in the flue gas;

[0045] S10, capturing CO2 in the flue gas and discharging the flue gas.

[0046] Preferably, in the above-mentioned method for processing retired wind turbine blades, in step S2, the incineration temperature is not less than 1100° C., and the time for which the flue gas acts on the retired wind turbine blades is not less than 2 seconds.

[0047] Preferably, in the above-mentioned method for processing retired wind turbine blades, step S2 further comprises injecting fuel oil when the incineration temperature is lower than 1100°C.

[0048] The processing device for retired wind turbine blades provided in the embodiment of the present application includes a grate, a steam turbine 12 and a flue gas purification component. In the present application, a grate is used to process retired wind turbine blades. The combustion mode of the grate is fixed bed combustion, which has low requirements on the size of combustibles and does not require the blades to be crushed into smaller particle sizes that meet fluidization requirements. Therefore, the use of grate combustion can reduce the energy consumption in the cutting process of retired wind turbine blades; the heat generated by the combustion of retired wind turbine blades is exchanged with the water-cooled wall 10 of the grate, and the generated steam drives the steam turbine 12 to do work; the flue gas generated by the combustion of retired wind turbine blades is processed by a flue gas purification component to remove CO2, NOx, SO2, dioxins and dust in the flue gas. The processing device for retired wind turbine blades disclosed in the present application realizes the incineration of retired wind turbine blades, while making full use of the residual value of retired wind turbine blades to reduce pollution to the environment.

[0049] The present application also discloses a method for processing retired wind turbine blades, using the processing device for retired wind turbine blades described in the above scheme. Since the processing device for retired wind turbine blades has the above technical effects, the method using the processing device for retired wind turbine blades also has the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0051] Figure 1 It is a structural schematic diagram of a device for processing retired wind turbine blades of the present application;

[0052] Figure 2 It is a structural schematic diagram of an air supply nozzle of a processing device for retired wind turbine blades of the present application;

[0053] Figure 3 It is a flow chart of the method for processing retired wind turbine blades of the present application.

[0054] The accompanying drawings are as follows:

[0055] 1. Feed inlet, 2. Preheating grate, 3. Combustion grate, 4. Burnout grate, 5. Air supply nozzle, 6. Second flow regulating valve, 7. Third flow regulating valve, 8. First flow regulating valve, 9. Secondary air supply nozzle, 10. Water-cooled wall, 11. Steam-water separator, 12. Steam turbine, 13. Condenser, 14. Economizer, 15. SCR, 16. Air preheater, 17. Desulfurization tower, 18. Dust collector, 19. CO2 collector, 20. Chimney, 21. Air blower, 22. Nozzle, 23. Ash collector, 24. Fuel nozzle. DETAILED DESCRIPTION

[0056] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0057] It should be noted that, for the convenience of description, only the parts related to the relevant application are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0058] It should be understood that the "system", "device", "unit" and / or "module" used in this application is a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the word can be replaced by other expressions.

[0059] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0060] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0061] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0062] Flowcharts are used in the present application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, the various steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or more operations may be removed from these processes.

[0063] See also Figure 1-Figure 3 .

[0064] Some embodiments of the present application disclose a device for processing retired wind turbine blades, including a grate, a steam turbine 12 and a flue gas purification component.

[0065] The grate comprises a preheating grate 2, a combustion grate 3, a burnout grate 4, an ash collector 23 and an economizer 14 which are connected in sequence.

[0066] The preheating grate 2 preheats the retired wind turbine blades with hot air and removes moisture from the retired wind turbine blades at the same time;

[0067] The combustion grate 3 is the high temperature area of ​​the furnace of the grate. The retired wind turbine blades are burned in the combustion grate 3 to form ash, and produce CO2, water vapor, NOx, SO2, etc.

[0068] The burnout grate 4 is still a high-temperature atmosphere, burning the combustibles in the ash until they are completely burned;

[0069] The remaining incombustible ash enters the ash container 23;

[0070] The economizer 14 is arranged in the tail flue of the grate to absorb the heat in the flue gas.

[0071] The preheating grate 2 and the burnout grate 4 do not require much air, but sufficient space must be ensured at the combustion grate 3.

[0072] In this application, a grate is used to process retired wind turbine blades. The combustion method of the grate is fixed bed combustion, which has low requirements on the size of the combustibles and does not require the blades to be broken into smaller particle sizes that meet fluidization requirements. Therefore, the use of grate combustion can reduce energy consumption during the cutting process of retired wind turbine blades.

[0073] The retired wind turbine blades after preliminary cutting enter the furnace through the feed port 1. Through the transmission of the grate chain, the cut retired wind turbine blades move on the preheating grate 2, the combustion grate 3 and the burnout grate 4 in sequence.

[0074] In order to ensure that the retired wind turbine blades can be fully burned, it is necessary to adjust the movement speed of the chain according to the actual combustion situation to adjust the residence time of the retired wind turbine blades on the preheating grate 2, the combustion grate 3 and the burnout grate 4.

[0075] The burnout rate of the retired wind turbine blades is obtained by real-time monitoring of the ash in the ash container 23 .

[0076] The burnout rate of the combustion residual product sample in the ash container 23 is measured. If the burnout rate is less than 98%, the rotation speed of the preheating grate 2, the combustion grate 3 and the burnout grate 4 is reduced, and the residence time of the sample on the preheating grate 2, the combustion grate 3 and the burnout grate 4 is increased; at the same time, the opening of the first flow regulating valve 8 is increased, and the opening of the second flow regulating valve 6 is reduced, and the air volume entering the combustion grate 3 is increased, so that the retired wind turbine blades are fully contacted and reacted with the air, thereby improving the burnout rate of the retired wind turbine blades.

[0077] The heat generated by the combustion of the retired wind turbine blades is exchanged with the water-cooled wall 10 of the grate, and the generated steam drives the steam turbine 12 to do work.

[0078] The flue gas generated by the combustion of retired wind turbine blades is treated by flue gas purification components to remove CO2, NOx, SO2, dioxins and dust in the flue gas.

[0079] In some embodiments of the present application, the flue gas purification assembly includes SCR 15 , an air preheater 16 , a desulfurization tower 17 , a dust collector 18 and a CO 2 collector 19 .

[0080] SCR15 is connected to economizer 14 to remove NOx from flue gas;

[0081] The air preheater 16 is in communication with the SCR 15 and is in communication with the grate through an air supply pipeline for heating the air supplied to the grate;

[0082] The desulfurization tower 17 is connected to the air preheater 16 and is used to remove SO2 from the flue gas;

[0083] The dust collector 18 is connected to the desulfurization tower 17. Activated carbon is arranged in the pipeline connecting the dust collector 18 and the desulfurization tower 17. The activated carbon is used to absorb dioxins in the flue gas and to remove dust and activated carbon in the flue gas.

[0084] The CO2 collector 19 is connected to the dust collector 18 and is used to capture CO2 in the flue gas to reduce the impact of greenhouse gas emissions into the atmosphere.

[0085] In some embodiments of the present application, the CO2 collector 19 achieves the adsorption and removal of carbon dioxide through typical carbon dioxide adsorbents such as calcium hydroxide.

[0086] Since the material of wind turbine blades is quite special and contains chlorine, it is very easy to produce polluting gases such as dioxins during the combustion process.

[0087] In order to suppress the production of polluting gases such as dioxins, it is necessary to ensure that the temperature of the combustion grate 3 reaches at least 1100° C. and that the residence time of the flue gas in the combustion grate 3 is greater than 2 seconds.

[0088] In the present application, a nozzle 22 for spraying activated carbon particles is arranged in the pipeline connecting the dust collector 18 and the desulfurization tower 17. The activated carbon particles can absorb dioxins in the flue gas, so as to more thoroughly remove dioxins in the flue gas.

[0089] Since the activated carbon particles for adsorbing dioxins are located before the dust collector 18, the dust collector 18 needs to remove not only the dust in the flue gas but also the activated carbon particles.

[0090] The flue gas after passing through the CO2 collector 19 is discharged through the chimney 20. At this time, NOx, SO2, CO2 and dioxins in the discharged flue gas have been processed and tend to be zero pollution.

[0091] The retired wind turbine blade processing device disclosed in the present application realizes the incineration of retired wind turbine blades, while fully utilizing the residual value of retired wind turbine blades and reducing pollution to the environment.

[0092] The device for processing retired wind turbine blades disclosed in the present application further includes a condenser 13 , which is located between the steam turbine 12 and the economizer 14 .

[0093] The steam after passing through the steam turbine 12 needs to be cooled by the condenser 13 and then supplied to the economizer 14.

[0094] like Figure 1 As shown, the processing device for retired wind turbine blades disclosed in the present application further includes a steam-water separator 11 , the inlet of the steam-water separator 11 is connected to the economizer 14 , and the steam separated by the steam-water separator 11 is supplied to the water-cooled wall 10 .

[0095] In some embodiments of the present application, the dust collector 18 is an electrostatic precipitator.

[0096] like Figure 1 As shown, the gas supply pipeline includes a main gas supply pipe, a first gas supply branch pipe, a second gas supply branch pipe and a third gas supply branch pipe.

[0097] One end of the main air supply pipe is connected to the air preheater 16, and the other end of the main air supply pipe is connected to the air supply nozzle 5 of the combustion grate 3. The main air supply pipe is provided with a first flow regulating valve 8;

[0098] One end of the first air supply branch pipe is connected to the main air supply pipe and the connection position is located upstream of the first flow regulating valve 8, and the other end of the first air supply branch pipe is connected to the secondary air supply nozzle 9;

[0099] One end of the second gas supply branch pipe is connected to the main gas supply pipe, a second flow regulating valve 6 is provided on the second gas supply branch pipe, and the other end of the second gas supply branch pipe is connected to the air supply nozzle 5 of the preheating grate 2;

[0100] One end of the third gas supply branch pipe is connected to the main gas supply pipe, a third flow regulating valve 7 is provided on the third gas supply branch pipe, and the other end of the third gas supply branch pipe is connected to the air supply nozzle 5 of the burnout grate 4.

[0101] Air supply nozzles 5 are arranged below the preheating grate 2 , the combustion grate 3 and the burnout grate 4 , and air is supplied into the preheating grate 2 , the combustion grate 3 and the burnout grate 4 through the air supply nozzles 5 .

[0102] The second gas supply branch pipe and the third gas supply branch pipe of the preheating grate 2 and the burnout grate 4 are respectively provided with a second flow regulating valve 6 and a third flow regulating valve 7, which can respectively adjust the air volume supplied to the preheating grate 2 and the burnout grate 4, and the air volume entering the combustion grate 3 can be adjusted by the first flow regulating valve 8 to ensure the stability of combustion in the furnace.

[0103] The first flow regulating valve 8 can adjust the air volume supplied to the preheating grate 2 and the burnout grate 4 to a certain extent.

[0104] The present application also provides a secondary air supply nozzle 9 in the middle of the furnace, the secondary air supply nozzle 9 is connected to the first air supply branch pipe, the first air supply branch pipe is also connected to the main air supply pipe, and no flow valve is provided on the first air supply branch pipe.

[0105] There are multiple secondary air supply nozzles 9 located at the same height of the furnace.

[0106] After the hot air is heated by the air preheater 16, a part of it is sent into the combustion grate 3 through the main air supply pipe, and the other part is sent into the furnace through the secondary air supply nozzle 9 in the middle of the furnace.

[0107] The air preheater 16 is provided with a blower 21 .

[0108] It should be noted here that in order to ensure that the residence time of the flue gas in the combustion grate 3 is greater than 2s, it is necessary to reasonably distribute and adjust the air flow rate, and through the reasonable arrangement of the air supply nozzles 22, a local recirculation zone is formed in the furnace.

[0109] The air sent into the furnace from below the grate is called primary air, and the air blown into the furnace at high speed from above the grate is called secondary air.

[0110] The function of secondary air is to disturb the flue gas, so that the flue gas and air are well mixed and the heat loss of incomplete combustion of gas is reduced;

[0111] Create flue gas vortex, prolong the flue gas flow, prolong the residence time of combustible substances in fly ash in the furnace, and fully burn them, so that the combustion rate of retired wind turbine blades is greater than 98%;

[0112] Relying on the separation effect of the swirl, the unburned combustibles are thrown back to the fire bed for re-ignition, reducing the carbon content of the fly ash, reducing the heat loss of incomplete combustion of solids, and reducing the initial dust concentration of the boiler.

[0113] When air is used as secondary air, it can also supplement the deficiency of primary air and promote complete combustion.

[0114] Preferably, the air supply nozzle 5 is a coaxial nozzle. Figure 2 As shown, the inner circle of the coaxial nozzle is a DC jet channel, and the outer circle of the coaxial nozzle is a swirl jet channel. The swirl jet method increases the residence time of the flue gas in the furnace. At the same time, the contact area between the combustibles on the grate and the air is increased, so that the combustion reaction is more complete, the internal temperature of the furnace is increased, and the generation of dioxins is reduced.

[0115] In the processing device for retired wind turbine blades disclosed in the present application, a fuel nozzle 24 is provided on the furnace of the grate for spraying fuel into the furnace to assist combustion.

[0116] If the temperature of combustion grate zone 3 is lower than 1100°C, the fuel nozzle 24 will be activated to spray fuel into the furnace to maintain the combustion temperature inside the furnace above 1100°C; at the same time, the feed amount of the feed port 1 is increased, the output of the blower 21 is increased, the feed amount and air volume are increased, and the combustion temperature in the furnace is increased; when the temperature of combustion grate zone 3 is higher than 1100°C, the fuel nozzle 24 is closed.

[0117] The present application also discloses a method for processing retired wind turbine blades, which uses the device for processing retired wind turbine blades described in the above scheme.

[0118] The method for processing retired wind turbine blades includes the following steps:

[0119] S1. Preheating the retired wind turbine blades and removing moisture from the retired wind turbine blades;

[0120] S2, the first burning of retired wind turbine blades;

[0121] S3, the second burning of retired wind turbine blades;

[0122] S4, collecting incombustible ash;

[0123] S5. Using steam generated by burning retired wind turbine blades to do work;

[0124] S6. Utilize the heat in the flue gas generated by burning retired wind turbine blades;

[0125] S7, remove NOx from flue gas;

[0126] S8, remove SO2 from flue gas;

[0127] S9, adsorb dioxins in flue gas and remove dust in flue gas;

[0128] S10, capture CO2 in flue gas and discharge the flue gas.

[0129] Since the processing device for retired wind turbine blades has the above-mentioned technical effects, the method using the processing device for retired wind turbine blades also has the same technical effects, which will not be described in detail here.

[0130] In step 2, the incineration temperature is not less than 1100°C, and the time for the flue gas to act on the retired wind turbine blades is not less than 2s.

[0131] In order to ensure that the residence time of the flue gas in the combustion grate 3 is greater than 2s, it is necessary to reasonably distribute and adjust the air flow rate, and form a local recirculation zone in the furnace through a reasonable arrangement of the air supply nozzles 22.

[0132] The present application prolongs the residence time of the flue gas in the combustion grate 3 by secondary air supply.

[0133] Step S2 also includes injecting fuel oil when the combustion temperature is lower than 1100°C.

[0134] If the temperature of combustion grate zone 3 is lower than 1100°C, the fuel nozzle 24 will be activated to spray fuel into the furnace to maintain the combustion temperature inside the furnace above 1100°C; at the same time, the feed amount of the feed port 1 is increased, the output of the blower 21 is increased, the feed amount and air volume are increased, and the combustion temperature in the furnace is increased; when the temperature of combustion grate zone 3 is higher than 1100°C, the fuel nozzle 24 is closed.

[0135] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.

Claims

1. A device for processing retired wind turbine blades, characterized in that: include: Grate, used to burn retired wind turbine blades, The grate comprises a preheating grate (2), a combustion grate (3), a burnout grate (4), an ash collector (23) and an economizer (14) which are connected in sequence. The preheating grate (2) is used to preheat the retired wind turbine blades and remove moisture from the retired wind turbine blades. The combustion grate (3) is used to incinerate the retired wind turbine blades and form ash. The burnout grate (4) is used to burn the combustibles in the ash. The ash container (23) is used to collect incombustible ash. The economizer (14) is arranged in the tail flue of the grate and is used to absorb heat in the flue gas; A steam turbine (12) is connected to the water-cooled wall (10) of the grate, and the steam turbine (12) can use the steam generated by the water-cooled wall (10) to perform work; Flue gas purification components, including SCR (15), air preheater (16), desulfurization tower (17), dust collector (18) and CO2 collector (19), The SCR (15) is in communication with the economizer (14) and is used to remove NOx from the flue gas; An air preheater (16) is in communication with the SCR (15), and the air preheater (16) is in communication with the grate through an air supply pipeline, and is used for heating air supplied to the grate; A desulfurization tower (17) is connected to the air preheater (16) and is used to remove SO2 from the flue gas; The dust collector (18) is connected to the desulfurization tower (17), and a nozzle (22) for spraying activated carbon particles is arranged in the pipeline connecting the dust collector (18) and the desulfurization tower (17), and the activated carbon particles are used to absorb dioxins in the flue gas and to remove dust and activated carbon in the flue gas; A CO2 collector (19) is connected to the dust collector (18) and is used to capture CO2 in the flue gas; It also includes a condenser (13) located between the steam turbine (12) and the economizer (14); The gas supply pipeline comprises: a main air supply pipe, one end of which is in communication with the air preheater (16), the other end of which is in communication with the combustion grate (3), and a first flow regulating valve (8) is provided on the main air supply pipe; a first air supply branch pipe, one end of which is connected to the main air supply pipe and the connection position is located upstream of the first flow regulating valve (8), and the other end of which is connected to the secondary air supply nozzle (9); a second gas supply branch pipe, one end of which is connected to the main gas supply pipe, a second flow regulating valve (6) is provided on the second gas supply branch pipe, and the other end of which is connected to the preheating grate (2); A third gas supply branch pipe, one end of which is connected to the main gas supply pipe, a third flow regulating valve (7) is provided on the third gas supply branch pipe, and the other end of which is connected to the burnout grate (4).

2. The processing device for retired wind turbine blades according to claim 1, characterized in that: It also includes a steam-water separator (11), the inlet of which is connected to the economizer (14), and the steam separated by the steam-water separator (11) is supplied to the water-cooled wall (10).

3. The processing device for retired wind turbine blades according to claim 1, characterized in that: The dust collector (18) is an electrostatic dust collector.

4. The device for processing retired wind turbine blades according to claim 1, characterized in that: The secondary air supply nozzle (9) is arranged in the middle of the furnace of the grate, and there are a plurality of secondary air supply nozzles (9) located at the same height of the furnace.

5. The device for processing retired wind turbine blades according to claim 1, characterized in that: Air supply nozzles (5) are arranged below the preheating grate (2), the combustion grate (3) and the burnout grate (4). The air supply nozzle (5) is a coaxial nozzle.

6. The device for processing retired wind turbine blades according to claim 1, characterized in that: A fuel nozzle (24) is arranged on the furnace of the grate for spraying fuel into the furnace to assist combustion.

7. A method for processing retired wind turbine blades, characterized in that: A device for processing retired wind turbine blades according to any one of claims 1 to 6 is used, Includes steps: S1. Preheating retired wind turbine blades and removing moisture from the retired wind turbine blades; S2, burning the retired wind turbine blades to form ash; S3, burning combustibles in the ash; S4, collecting incombustible ash; S5, using steam generated by burning the retired wind turbine blades to perform work; S6, utilizing the heat in the flue gas generated by burning the retired wind turbine blades; S7, removing NOx from the flue gas; S8, removing SO2 from the flue gas; S9, adsorbing dioxins in the flue gas and removing dust in the flue gas; S10, capturing CO2 in the flue gas and discharging the flue gas.

8. The method for processing retired wind turbine blades according to claim 7, characterized in that: In the step S2, the incineration temperature is not less than 1100°C, and the time for the flue gas to act on the retired wind turbine blades is not less than 2s.

9. The method for processing retired wind turbine blades according to claim 7, characterized in that: The step S2 further comprises injecting fuel oil when the combustion temperature is lower than 1100°C.

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