Pyrolysis recycling system for abandoned wind power blades in cooperation with power plant boilers

Abstract

The application discloses a pyrolysis recycling system for treating abandoned wind power blades in cooperation with a power station boiler and belongs to the technical field of solid waste recycling. The system comprises a power station boiler, a pyrolysis furnace, a mixed flue, a nitrogen air duct and a controller. Different temperature level flue gas is mixed and nitrogen is mixed to accurately control oxygen, so that a safe and stable heat source is provided for the pyrolysis furnace; pyrolysis gas returns to the boiler furnace through an outlet flue and is burned out, and the recyclable fiber and residue are transported out by a chain grate; the controller links various sensors to perform oxygen content control, temperature adjustment, fiber quality protection and safety interlocking operation. The problems of poor heat source adaptability, uncontrollable oxygen concentration, poor fiber quality and high risk, and difficult pyrolysis gas disposal in the pyrolysis of abandoned wind power blades are solved, and energy cascade utilization, intrinsically safe operation, high-quality and high-purity fiber recycling and pollution collaborative treatment are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid waste recycling, and particularly relates to a pyrolysis recycling system for cooperatively treating waste wind power blades by a power station boiler. BACKGROUND

[0002] With the rapid development of the wind power industry, a large number of wind power blades enter the retirement period. The wind power blades are mainly composed of glass fiber / carbon fiber reinforced resin-based composite materials, have high strength and corrosion resistance, but are difficult to degrade naturally. The traditional disposal methods (landfill, incineration) have problems such as land occupation, environmental pollution and resource waste, and the fiber performance is seriously deteriorated by physical crushing recycling, and the economic value is low. The pyrolysis method can decompose the resin to recover high-value fibers in an oxygen-deficient environment, but a stable high-temperature heat source and a strictly controlled oxygen environment are needed, otherwise, it is easy to cause explosion or fiber quality to decrease.

[0003] Meanwhile, a large amount of gradient temperature flue gas is generated in the operation of the coal-fired power station boiler, and the waste heat utilization rate is insufficient. If the boiler flue gas waste heat can be used to provide energy for blade pyrolysis, the pyrolysis energy consumption can be reduced, and the energy efficiency of the power plant can be improved.

[0004] The prior art has many defects, for example, the heat source has poor adaptability, the boiler flue gas temperature fluctuates greatly with the load, and the single flue gas cannot stably meet the pyrolysis temperature requirement. If the high-temperature flue gas is directly extracted, it is easy to cause the fiber strength to decrease; if the low-temperature flue gas is extracted, the pyrolysis is incomplete, the resin residual rate is high, and the fiber cannot be separated. The oxygen content of the flue gas is high, which is easy to cause the fiber strength to decrease.

[0005] The existing independent pyrolysis system often relies on pure nitrogen to create an oxygen-free environment, which is costly, and the nitrogen consumption accounts for more than 30% of the total energy consumption of the system. When the boiler flue gas is mixed, there is a lack of dynamic oxygen content adjustment mechanism, and the oxygen concentration fluctuation leads to local area overrun, which causes the risk of flash explosion accident.

[0006] The pyrolysis gas is directly discharged after enrichment, which pollutes the environment, and additional purification facilities need to be constructed for independent combustion disposal, which increases the investment greatly. The recovered fiber is oxidized and carbonized when it is in contact with air during the high-temperature conveying stage, and is hygroscopic and caked when it is stored, which reduces the reuse value.

[0007] Therefore, it is urgent to develop a resource recycling technology which can safely and efficiently utilize the boiler flue gas waste heat to treat the waste blades and realize the whole-process controllable production. SUMMARY

[0008] The present application overcomes the problems of poor heat source adaptability, high risk of oxygen concentration out of control and difficult pyrolysis gas disposal in the pyrolysis of waste wind power blades, and realizes energy cascade utilization, intrinsically safe operation, high-purity fiber recovery and pollution co-control.

[0009] In order to achieve the above-mentioned purpose, the present application adopts the following scheme:

[0010] The pyrolysis recycling system for treating waste wind power blades in cooperation with a power station boiler comprises:

[0011] The power station boiler is provided with a furnace, a horizontal flue, a turning chamber and a tail flue in sequence along the flue gas flow direction.

[0012] The pyrolysis furnace is provided with a waste wind power blade inlet, a fiber outlet, a flue gas inlet and a flue gas outlet.

[0013] The outlet of the mixed flue is connected to the flue gas inlet of the pyrolysis furnace through a booster fan, and the inlet of the mixed flue is connected to a high-temperature flue, a medium-temperature flue and a low-temperature flue, wherein the inlet of the high-temperature flue is communicated to the horizontal flue, the inlet of the medium-temperature flue is communicated to the turning chamber, and the inlet of the low-temperature flue is communicated to the tail flue; wherein,

[0014] The high-temperature flue, the medium-temperature flue and the low-temperature flue are each provided with a closing damper and an adjusting damper, and the mixed flue is provided with an oxygen measuring point and a temperature measuring point.

[0015] The outlet of the nitrogen air flue is connected to the inlet of the mixed flue, and the nitrogen air flue is provided with an adjusting valve.

[0016] The flue gas outlet of the pyrolysis furnace is connected to the furnace of the power station boiler through a pyrolysis furnace outlet flue, the pyrolysis furnace outlet flue is provided with a gas analyzer, the pyrolysis furnace is provided with a thermocouple inside and is equipped with a chain grate for conveying waste wind power blades and fibers, and the pyrolysis furnace is provided with a visual monitoring device for observing the fiber discharge condition.

[0017] The flue gas purification equipment is provided with a denitration device, a dust removal device and a desulfurization device, and the flue gas inlet thereof is communicated to the rear of the tail flue of the power station boiler.

[0018] The controller is in signal communication with the oxygen measuring point and the temperature measuring point of the mixed flue, the adjusting valve of the nitrogen air flue, the thermocouple of the pyrolysis furnace, the visual monitoring device, the driving motor of the chain grate, the gas analyzer and the load monitoring device of the power station boiler, and controls the executing mechanism of the adjusting dampers of the high-temperature flue, the medium-temperature flue and the low-temperature flue through signals; the controller is configured to perform oxygen control, temperature adjustment, fiber quality protection and safety control operations during pyrolysis.

[0019] Preferably, the oxygen measuring point of the mixed flue is a first oxygen measuring point, and the flue gas inlet of the pyrolysis furnace is further provided with a second oxygen measuring point; the controller obtains a flue gas initial oxygen signal at the first oxygen measuring point and a flue gas target oxygen signal at the second oxygen measuring point; based on the flue gas initial oxygen signal and a preset oxygen amount range target value required for the pyrolysis reaction, and in combination with a real-time load state signal of the power station boiler, the required nitrogen gas mixing amount is calculated through a feedforward-feedback control algorithm.

[0020] The controller generates and outputs a control signal to the regulating valve to dynamically adjust the opening degree of the regulating valve to mix the calculated required amount of nitrogen into the mixed flue gas, when the oxygen content monitored by the second oxygen content measuring point exceeds the upper limit of the preset oxygen content range required for pyrolysis reaction, the controller controls the opening degree of the regulating valve to increase to increase the amount of nitrogen mixed; when the oxygen content monitored by the second oxygen content measuring point is lower than the lower limit of the preset range, the controller controls the opening degree of the regulating valve to decrease to reduce the amount of nitrogen mixed.

[0021] As a preferred, the pyrolysis furnace outlet flue is provided with a venting pipeline connected to the atmosphere and installed with a related shut-off valve, and the gas analyzer monitors the combustible gas concentration in the flue gas at the outlet of the pyrolysis furnace in real time, when the power plant boiler needs to be shut down and the system needs to be released, the controller performs the following time sequence operation:

[0022] Immediately close all closing dampers and regulating dampers on the high-temperature flue, medium-temperature flue and low-temperature flue to cut off the flue gas heat source; open the total valve of the nitrogen air duct and adjust the regulating valve to the fully open state to inject nitrogen into the mixed flue for purging; at the same time, open the venting pipeline shut-off valve and close the damper connecting the pyrolysis furnace outlet flue to the boiler furnace to make the purge gas discharged to the atmosphere through the venting pipeline;

[0023] Continue to operate the booster fan and monitor the data of the gas analyzer, when the combustible gas concentration is detected to be zero for 15 minutes continuously, stop the operation of the booster fan; after the chain grate completely transports the solid residues in the furnace, stop the chain grate;

[0024] Finally, close the regulating valve and total valve of the nitrogen air duct, and when the temperature difference between each temperature measuring point of the pyrolysis furnace and the ambient temperature is less than 5℃ and maintained for 15 minutes, close the venting pipeline shut-off valve.

[0025] As a preferred, the pyrolysis furnace is internally configured with a thermocouple group and a flue gas distribution valve system; at least three groups of thermocouples are arranged in parallel along the width direction of the furnace body in the central region and the two side edge regions inside the pyrolysis furnace; the controller simultaneously receives the fiber desorption state image signal from the visual monitoring device and the temperature signal of the thermocouple group, and performs the following operation:

[0026] Extract the visual feature parameters of the fiber surface by image recognition algorithm, including color depth value and texture edge displacement amount; if the color depth value is higher than the set threshold value, increase the target temperature setting value of the pyrolysis furnace by 5-10℃; if the texture edge displacement amount per unit time is lower than the preset value, reduce the chain grate speed by 10%~25% to prolong the material residence time;

[0027] Real-time comparison of the synchronous temperature data of each group of thermocouples along the furnace width direction inside the pyrolysis furnace, if the temperature detected by any thermocouple inside the pyrolysis furnace exceeds the preset upper limit temperature, immediately reduce the high-temperature flue gas branch valve opening degree of the corresponding area by 20%~30%, and simultaneously increase the low-temperature flue gas branch valve opening degree by 15%~25%; if the temperature does not decrease by at least 20℃ below the preset upper limit within 60 seconds, the high-temperature flue gas branch valve is closed; if the temperature detected by any thermocouple inside the pyrolysis furnace exceeds the preset lower limit temperature, immediately reduce the low-temperature flue gas branch valve opening degree of the corresponding area by 20%~30%, and simultaneously increase the high-temperature flue gas branch valve opening degree by 15%~25%; if the temperature does not increase by at least 20℃ above the preset lower limit within 60 seconds, the low-temperature flue gas branch valve is closed;

[0028] If all thermocouple temperatures do not exceed the temperature upper and lower limits, but the temperature difference of any two groups continues to be >30℃ for 3 minutes, then for the low-temperature area, increase the high-temperature flue gas branch valve opening degree by 10%~15% and decrease the low-temperature flue gas branch valve opening degree by 5%~10%; for the high-temperature area, decrease the high-temperature flue gas branch valve opening degree by 5%~10% and increase the low-temperature flue gas branch valve opening degree by 8%~12%; review the temperature difference every 30 seconds until the temperature difference ΔT≤20℃ to stop adjusting.

[0029] As a preferred, the controller receives in real time the flue gas inlet temperature T1 detected by the mixed flue temperature measuring point, the furnace temperature mean value T2 detected by the thermocouple inside the pyrolysis furnace, and the oxygen concentration O measured by the second oxygen measuring point arranged at the flue gas inlet of the pyrolysis furnace; the controller calculates the real-time flue gas temperature T=0.6T1+0.4T2, and calculates the pyrolysis intensity factor K according to the real-time flue gas temperature T and the oxygen concentration O, and the calculation formula is: , wherein, T ref is the predetermined pyrolysis optimal temperature mean value, O ref is the expected oxygen mean value, and α and β are temperature dominant weight coefficients.

[0030] According to the pyrolysis intensity factor value, the following synchronous adjustment operations are performed:

[0031] When the pyrolysis intensity factor is lower than the preset lower limit threshold, increase the medium-temperature flue adjusting baffle opening degree to increase the flue gas temperature, and at the same time, decrease the nitrogen air duct adjusting valve opening degree to increase the oxygen concentration;

[0032] When the pyrolysis intensity factor is higher than the preset upper limit threshold, decrease the medium-temperature flue adjusting baffle opening degree to decrease the flue gas temperature, and at the same time, increase the nitrogen air duct adjusting valve opening degree to decrease the oxygen concentration;

[0033] If the pyrolysis furnace outlet flue gas temperature deviates from the expected temperature range after adjustment, further adjust the adjusting baffle opening degree of the high-temperature flue or the low-temperature flue.

[0034] As a preferred, the controller receives in real time the power station boiler load signal and performs the following operations:

[0035] When the power station boiler load change rate exceeds 3% / min for 3 minutes in succession, the temperature weight coefficient a is dynamically corrected based on the load change direction:

[0036] When the load rises, the flue gas temperature weight coefficient a is raised to 1.2 times the original value;

[0037] When the load drops, the flue gas temperature weight coefficient a is reduced to 0.8 times the original value;

[0038] Before the controller executes the synchronous adjustment operation according to the corrected pyrolysis intensity factor value, the temperature change rate of the thermocouple in the pyrolysis furnace is verified, and if the temperature change rate is contrary to the change direction of the pyrolysis intensity factor, the adjustment instruction is frozen and manual intervention alarm is started.

[0039] As preferred, the controller receives the power station boiler load signal and the temperature change rate data detected by the thermocouple in the pyrolysis furnace in real time; when the boiler load change rate exceeds 5% / min for 2 minutes in succession, it is judged that the load drops or rises suddenly, and the following operations are performed:

[0040] When the load drops suddenly, the chain grate speed is reduced to 70% of the original speed, the residence time of the material in the pyrolysis furnace is prolonged; when the load rises suddenly, the chain grate speed is raised to 130% of the original speed, the residence time of the material in the pyrolysis furnace is shortened; the pyrolysis intensity factor calculation is frozen for 5 minutes, and the current flue gas adjustment baffle and nitrogen valve opening degree are maintained unchanged; when the main thermocouple temperature change rate returns to within ±5℃ / min, the pyrolysis intensity factor calculation is reactivated and the speed freezing is released.

[0041] The present application at least includes the following beneficial effects: (1) through the deep integration of the boiler flue system and the pyrolysis furnace, a gradient heat extraction-temperature control-pyrolysis gas recirculation closed loop is constructed, without additional fuel supply; (2) the dual oxygen content measuring point and the feedforward-feedback algorithm are adopted, combined with nitrogen blending and boiler load prediction, the oxygen concentration in the pyrolysis zone is stably controlled, the fiber recycling quality is enhanced, and the inert gas consumption is reduced; (3) the pyrolysis gas is burned out in the high temperature of the boiler, relying on the existing purification equipment to realize efficient removal of pollutants; the shutdown timing control ensures the safe exit of the system; (4) the pyrolysis process is dynamically optimized based on visual recognition and temperature zoning control, which significantly reduces the carbon residue of the fiber; (5) the pyrolysis intensity factor of multi-parameter fusion realizes rapid response in variable load conditions, avoiding reaction out of control. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 The operation principle diagram of the pyrolysis recovery system for the power station boiler for cooperatively processing waste wind power blades provided by the present application;

[0043] Figure 2 The structural schematic diagram of the power station boiler of the present application. DETAILED DESCRIPTION

[0044] The application will be further described in details below with reference to the drawings, so that those skilled in the art can implement the application according to the description and the drawings.

[0045] It should be understood that the terms such as “have”, “contain” and “include” used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0046] It should be noted that the experimental methods in the following embodiments are all conventional methods unless otherwise specified, and the materials can be obtained from commercial channels unless otherwise specified. In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mount”, “connect”, “set” should be understood broadly, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. The orientations or positional relationships indicated by the terms “transverse”, “longitudinal”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0047] As shown in Figure 1 and 2 The pyrolysis recovery system for treating waste wind power blades in cooperation with a power plant boiler provided by the present application comprises:

[0048] The power plant boiler is provided with a furnace, a horizontal flue, a turning chamber and a tail flue in sequence along the flow direction of flue gas.

[0049] The pyrolysis furnace is provided with a waste wind power blade inlet, a fiber outlet, a flue gas inlet and a flue gas outlet.

[0050] The outlet of the mixed flue is connected to the flue gas inlet of the pyrolysis furnace through a booster fan, and the inlet of the mixed flue is connected with a high-temperature flue, a medium-temperature flue and a low-temperature flue, wherein the inlet of the high-temperature flue is communicated to the horizontal flue, the inlet of the medium-temperature flue is communicated to the turning chamber, and the inlet of the low-temperature flue is communicated to the tail flue; wherein,

[0051] The high-temperature flue, the medium-temperature flue and the low-temperature flue are each provided with a closing baffle and an adjusting baffle, and the mixed flue is provided with an oxygen measuring point and a temperature measuring point.

[0052] The outlet of the nitrogen gas flue is connected to the inlet of the mixed flue, and the nitrogen gas flue is provided with an adjusting valve.

[0053] The flue gas outlet of the pyrolysis furnace is connected to the furnace of the power station boiler through a pyrolysis furnace outlet flue, which is provided with a gas analyzer, and the pyrolysis furnace is internally provided with a thermocouple and equipped with a chain grate for conveying waste wind turbine blades and fibers, and the pyrolysis furnace is provided with a visual monitoring device for observing the fiber shedding condition;

[0054] The flue gas purification equipment, whose flue gas inlet is communicated behind the tail flue of the power station boiler, comprises a denitration device, a dust removal device and a desulfurization device;

[0055] The controller is in signal connection with the oxygen measuring point of the mixed flue, the temperature measuring point, the regulating valve of the nitrogen air flue, the thermocouple of the pyrolysis furnace, the visual monitoring device, the driving motor of the chain grate, the gas analyzer and the load monitoring device of the power station boiler respectively, and controls the execution mechanism of the regulating damper of the high-temperature flue, the medium-temperature flue and the low-temperature flue through signals; the controller is configured to perform oxygen control, temperature regulation, fiber quality protection and safety control operations in the pyrolysis process.

[0056] The basic heat source and flue gas source of the system is the power station boiler. As shown in Figure 2 The boiler is provided with a furnace, a horizontal flue, a turning chamber and a tail flue in sequence along the flue gas flow direction. The fuel is burned in the furnace to produce high-temperature flue gas. The high-temperature flue gas flows through the horizontal flue (where the heating surface such as a superheater is usually arranged, and the flue gas temperature is very high, which may reach 800-1000°C), the turning chamber (where the flue gas changes direction, and the temperature is reduced, but is still in the medium-high temperature range, which may be reduced to 600-800°C), and the tail flue (where low-temperature reheaters, low-temperature superheaters, economizers and other low-temperature heating surfaces are arranged, and the flue gas temperature is further reduced to a lower level, which may be reduced to 300-400°C or lower). This structure naturally forms a significant temperature gradient from the boiler furnace outlet to the chimney outlet. This temperature gradient creates conditions for the subsequent pyrolysis furnace to provide different temperature levels of flue gas heat sources. The boiler is the driving force and the original provider of heat for the entire system to run.

[0057] The core processing unit for processing wind turbine blades is a pyrolysis furnace. Four key interfaces are provided thereon: a waste wind turbine blade inlet (for feeding the waste blades to be processed), a fiber outlet (for discharging the recovered fiber products after pyrolysis), a flue gas inlet (for introducing heated flue gas), and a flue gas outlet (for discharging the flue gas carrying pyrolysis products after completing heat exchange). A chain grate is provided in the furnace for conveying the waste wind turbine blades and fibers. A thermocouple is also provided in the furnace for monitoring the temperature inside the furnace, and a visual monitoring device (such as a high-temperature camera or an observation window) is provided for observing the fiber detachment. Pyrolysis is a process of decomposing large-molecule organic matter (such as resin matrix in wind turbine blades) into smaller-molecule gas (pyrolysis gas), liquid (tar, possibly less), and fiber and solid residue, using heat energy in an oxygen-deficient or oxygen-free environment. The chain grate realizes automatic feeding and discharging. The thermocouple monitors the temperature at the key positions inside the furnace in real time, ensuring that the pyrolysis reaction is carried out within the set temperature window (for example, 500-600°C, the specific optimal range needs to be determined according to the blade material). The visual monitoring device is used for manual or automatic monitoring of the state and quality of fiber detachment from the blade matrix (such as whether there is too much carbon residue, whether the fibers are fused, etc.). The pyrolysis furnace is the core equipment for realizing resource recycling of waste blades. The waste blades are fed from the inlet, and are indirectly or directly heated by the heated flue gas from the flue gas inlet under the conveying of the chain grate, to undergo pyrolysis reaction. The target product fiber is discharged from the outlet, and the pyrolysis gas generated by the reaction is discharged with the flue gas from the flue gas outlet. The thermocouple and the visual device provide key signals for process monitoring and automatic control.

[0058] A mixing flue is designed in the system, the outlet of which is connected to the flue gas inlet of the pyrolysis furnace by a booster fan to provide power and the required hot flue gas. The inlet of the mixing flue is connected with three branch flues: high-temperature flue (the inlet is connected to the horizontal flue of the boiler), medium-temperature flue (the inlet is connected to the diversion chamber of the boiler), and low-temperature flue (the inlet is connected to the tail flue of the boiler). Each branch flue (high-temperature, medium-temperature, and low-temperature) is respectively provided with a closing damper (used to completely cut off the flue gas) and an adjusting damper (used to finely adjust the flow of the flue gas). The mixing flue is provided with an oxygen measuring point (first oxygen measuring point) and a temperature measuring point. The three branch flues respectively extract flue gas of different temperatures from different parts of the boiler (the high-temperature flue provides the highest temperature flue gas, the medium-temperature flue provides the second highest temperature flue gas, and the low-temperature flue provides the lowest temperature flue gas). By adjusting the opening degree ratio of the three adjusting dampers, flue gas of different temperatures can be mixed as needed, so that a mixed flue gas flow with adjustable temperature (for example, adjustable within the range of 500-700°C) is obtained at the outlet of the mixing flue. The closing damper is used for maintenance or emergency shutdown. The oxygen measuring point monitors the initial oxygen concentration of the mixed flue gas, and the temperature measuring point monitors the initial temperature of the mixed flue gas. The booster fan provides the required pressure head to overcome the system resistance and send the mixed flue gas into the pyrolysis furnace. This system ingeniously utilizes the temperature gradient distribution of the boiler flue gas, and by mixing flue gas of different temperature levels, provides a flexible, stable, and temperature-controllable heat source for the pyrolysis furnace. This is one of the key links to realize "co-processing". The oxygen and temperature measuring points provide initial signals for subsequent oxygen and temperature control.

[0059] A nitrogen air duct is provided in the system as an oxygen safety basis, and the outlet of the nitrogen air duct is connected to the inlet of the mixing flue. An adjusting valve (used to control the flow of nitrogen) is provided in the nitrogen air duct. Nitrogen is an inert gas, which is injected into the mixing flue and further mixed with the mixed flue gas from the boiler, so as to dilute the oxygen concentration in the flue gas. The pyrolysis process needs to strictly control the oxygen content (usually needs to be far lower than 10%, for example, the target control is 3-8% or lower), to prevent the combustion or even explosion of the pyrolysis products (especially pyrolysis gas) in the pyrolysis furnace. The opening degree of the adjusting valve determines the flow of nitrogen to be mixed, thereby directly affecting the oxygen concentration of the mixed gas entering the pyrolysis furnace. The nitrogen air duct is one of the core safety measures to ensure the safety (explosion-proof) of the pyrolysis process and to create a suitable reaction environment (oxygen-deficient pyrolysis). It cooperates with the mixing flue to ensure that the heat-carrying medium (flue gas + nitrogen) entering the pyrolysis furnace has a suitable temperature and extremely low oxygen content. The adjusting valve is the key actuator to realize accurate control of the oxygen concentration.

[0060] A booster fan is provided in the system to provide power for the mixed flue gas and nitrogen to enter the pyrolysis furnace and for the flue gas after pyrolysis to flow back to the boiler furnace of the power plant, and to prevent uncontrolled oxygen leakage into the pyrolysis furnace and its inlet flue from the ambient air.

[0061] The flue gas outlet of the pyrolysis furnace is connected to the furnace of the power plant boiler through a pyrolysis furnace outlet flue, forming a pyrolysis gas treatment and recycling path. A gas analyzer (for monitoring the composition of the flue gas after pyrolysis, especially the concentration of combustible gases such as carbon monoxide CO, hydrogen H2, methane CH4, etc.) is provided on the outlet flue. The flue gas discharged from the pyrolysis furnace carries combustible gases (pyrolysis gas) produced by the pyrolysis reaction. These gases have a calorific value. The gas analyzer monitors their composition and concentration in real time, providing a basis for process monitoring and safety control. The flue gas rich in combustible gases is sent back to the boiler furnace, where it can be completely burned in the high-temperature environment of the boiler, recovering its energy and improving the overall energy efficiency of the system. On the other hand, it also completely eliminates the safety hazards and environmental pollution risks of direct emission of combustible gases (avoiding VOCs emission). This is another important embodiment of "co-processing" (energy synergy). This design achieves safe and efficient disposal and energy recovery of pyrolysis gas. The gas analyzer is not only used for energy evaluation, but also an important input signal for safety interlock control (for example, when the concentration of combustible gases is abnormally high, safety measures may be triggered).

[0062] The system includes a standard flue gas purification device as a tail flue gas purification system, and the flue gas inlet of the flue gas purification device is connected after the tail flue of the power plant boiler (i.e. on the original flue process of the boiler). The purification device usually includes a denitration device (such as SCR, for removing nitrogen oxides NO x ), a dust removal device (such as electrostatic precipitation or bag filter, for removing fly ash particles), and a desulfurization device (such as wet desulfurization, for removing sulfur dioxide SO2). This is the standard environmental protection configuration of coal / biomass boilers, which is used to purify the flue gas produced by boiler combustion to meet emission standards. In this collaborative system, the boiler burns fuel and injected pyrolysis gas, and the flue gas produced still needs to be treated by this set of purification equipment to meet the standard before being discharged. This set of equipment ensures that the flue gas finally discharged by the entire system (including the collaborative processing part) is clean and meets environmental protection regulations. It treats all flue gas from the tail flue of the boiler, which contains pollutants produced by burning fuel and pyrolysis gas.

[0063] The central controller of the system is connected with the following devices and signal points through communication signal lines: the oxygen measuring point of the mixed flue (first oxygen measuring point), the temperature measuring point of the mixed flue, the regulating valve of the nitrogen gas flue, the thermocouple in the pyrolysis furnace, the visual monitoring device of the pyrolysis furnace, the gas analyzer of the flue at the outlet of the pyrolysis furnace, and the load monitoring device of the power station boiler. At the same time, the controller controls the actuator of the regulating baffle on the high-temperature flue, the medium-temperature flue, and the low-temperature flue (i.e., the device for driving the change of the opening degree of the regulating baffle). The controller is programmed to perform key control operations in the pyrolysis process, including oxygen control (maintaining a safe low-oxygen environment), temperature regulation (ensuring pyrolysis in the optimal temperature range), fiber quality protection (preventing fiber overheating and damage or insufficient pyrolysis), and safety control operations (such as emergency shutdown and purging). The controller is the control center of the entire system and the core of the automation control. It collects signals from various measuring points (oxygen content, temperature, combustible gas concentration, boiler load, fiber image, and furnace temperature distribution) in real time, calculates and analyzes them according to the preset control logic and algorithm (which may include feedback control, feedforward control, and logical judgment), and then outputs control instructions to the actuators (nitrogen regulating valve, flue regulating baffle actuator, etc.). The controller is the key to the coordinated, safe, and efficient operation of all the above technical features. It realizes oxygen control, temperature regulation, fiber quality protection, and safety control functions, including:

[0064] Oxygen control: dynamically adjust the opening degree of the nitrogen valve based on the measuring point signals to ensure that the oxygen concentration of the mixed gas entering the pyrolysis furnace is at a safe and beneficial level for pyrolysis.

[0065] Temperature regulation: based on the temperature measuring point signals and the boiler load state, dynamically adjust the opening degree of the three-way flue regulating baffle to control the temperature of the mixed flue gas and thus control the temperature of the pyrolysis furnace.

[0066] Fiber quality protection: monitor the temperature distribution in the furnace through the thermocouple to prevent local overheating and reduce fiber quality, and use the visual monitoring device to assist in judging the fiber desorption state (indirectly reflecting the degree of pyrolysis).

[0067] Safety control: receive the boiler load signal (load changes may affect flue gas parameters) and execute the preset safety interlock program (such as emergency shutdown and nitrogen injection for purging) in abnormal situations (such as high combustible gas concentration and boiler shutdown).

[0068] As an example of the system running process, at the start of the system, the controller instructs to open the closing damper and regulating damper of the corresponding flue according to the current load of the boiler and the preset initial parameters (such as opening the medium-temperature flue), and adjusts the opening degree to the initial position, while starting the booster fan. The nitrogen regulating valve is also opened to the initial opening degree. The waste blades begin to be put in. The controller continuously reads the signals of the oxygen content and temperature of the mixed flue, the multi-point temperature in the pyrolysis furnace, the outlet combustible gas concentration, the boiler load, etc. If the oxygen content of the mixed flue is higher than the set value, the controller will increase the opening degree of the nitrogen valve for dilution. If the temperature of a certain area of the pyrolysis furnace is lower than the set value, the controller will open the high-temperature or medium-temperature flue regulating damper (or close the low-temperature flue damper) to increase the proportion of high-temperature flue gas. If the visual monitoring finds signs of carbonization of the fibers, the controller may increase the target oxygen content or temperature set value or reduce the chain speed. If the boiler load suddenly decreases, causing the flue gas temperature to drop, the controller will quickly adjust the damper opening degree and may adjust the nitrogen flow to maintain the pyrolysis conditions. The whole process is a continuous control of dynamic closed loop.

[0069] This system makes full use of the different temperature flue gas of the power plant boiler as the pyrolysis energy source, realizes the energy cascade utilization, and significantly reduces the operation cost of the waste wind power blade pyrolysis recovery. Through accurate oxygen content control (nitrogen mixing) and multiple monitoring (temperature, combustible gas, visualization), and designing a safety path for the pyrolysis gas recirculation boiler, safety accidents such as fire and explosion during the pyrolysis process are effectively prevented, and the safety of personnel and equipment is ensured. Through multi-point temperature monitoring, visual observation and chain grate speed control, the pyrolysis reaction conditions can be optimized, which helps to improve the purity (reduce carbon residue) and physical properties (prevent overheating to reduce fiber strength, etc.) of the recovered fibers. The combustible gas produced by pyrolysis is introduced into the high-temperature furnace of the boiler for full combustion, and its pollutants are treated together with the boiler flue gas by mature and efficient denitrification, dust removal and desulfurization equipment in the tail, to ensure that the final emission meets strict environmental protection standards. The integrated control system realizes the automatic monitoring and regulation of key parameters (oxygen content, temperature, fiber state related parameters) in the pyrolysis process, greatly reduces the difficulty and intensity of manual operation, and improves the stability and processing efficiency of the system operation. The waste blade processing facility is deeply integrated with the existing power plant boiler system, sharing the heat source (flue gas), energy recovery facility (boiler furnace) and environmental protection facility (tail purification), and realizing efficient utilization of infrastructure.

[0070] The mixed flue system (including high-temperature / medium-temperature / low-temperature flue and damper) is combined with the nitrogen air duct and regulating valve, and the oxygen content and temperature are cooperatively controlled by the controller, which realizes safe, stable and flexible provision and control of the heat-carrying medium meeting the pyrolysis process requirements (specific temperature, extremely low oxygen content) when using boiler flue gas heat for pyrolysis. To further analyze the effect of this technology, an example is provided:

[0071] Scenario: A 350 MW coal-fired power plant boiler is used to dispose of waste wind turbine blades. The boiler is operating at 50% load.

[0072] Operation process includes:

[0073] 1. The controller receives target instructions: the main pyrolysis section of the pyrolysis furnace needs to maintain 580 ± 20 °C, and the inlet flue gas oxygen content needs to be controlled at 5-7% (vol).

[0074] 2. The controller reads signals in real time:

[0075] Mixed flue gas temperature measuring point: the current mixed flue gas temperature is 520 °C. Mixed flue gas oxygen content measuring point (first oxygen content measuring point): the current oxygen content is 8% (from the boiler flue gas itself). Boiler load monitoring: stable at 50%.

[0076] 3. Oxygen content control: the controller determines that the current mixed flue gas oxygen content (8%) is higher than the target upper limit (7%). It calculates the amount of nitrogen gas that needs to be mixed in through an algorithm and outputs a signal to increase the opening of the nitrogen gas duct regulating valve. Nitrogen gas is injected into the mixed flue gas inlet and mixed with the boiler flue gas to dilute it. The controller continues to monitor until the mixed flue gas outlet (or the second oxygen content measuring point at the inlet of the pyrolysis furnace) shows that the oxygen content has dropped to 5.8%, stable within the target range.

[0077] 4. Temperature control: the controller simultaneously determines that the current mixed flue gas temperature (520 °C) is slightly lower than the target median value (580 °C). It adjusts the opening of each flue gas regulating damper through an algorithm: slightly increases the opening of the high-temperature flue gas regulating damper (increases the proportion of high-temperature flue gas above 700 °C), slightly reduces the opening of the low-temperature flue gas regulating damper (reduces the proportion of low-temperature flue gas by about 300 °C). The opening of the medium-temperature flue gas regulating damper is basically maintained. The temperature of the mixed flue gas rises to 590 °C, meeting the pyrolysis requirements.

[0078] 5. Pyrolysis operation: the mixed gas with a temperature of about 590 °C and an oxygen content of about 5.8%, which has been precisely regulated, is sent to the pyrolysis furnace by the booster fan, serving as a heat source to heat the waste wind turbine blades, and carries out safe and efficient pyrolysis reaction. The combustible gas produced by pyrolysis is sent back to the boiler furnace to burn out.

[0079] When the boiler load fluctuates (such as rising to 90% or falling to 70%) or the flue gas parameters at different positions naturally change, the controller can dynamically adjust the amount of nitrogen gas mixed and the proportion of three-way flue gas. The pyrolysis furnace inlet always obtains a temperature that is stable (with small fluctuations) and oxygen content that is strictly controlled, ensuring that the pyrolysis process is safe (without the risk of deflagration), continuous (stable temperature facilitates reaction), and efficient (good quality of fiber recovery, stable pyrolysis gas production). The waste heat of the boiler is used in a step-by-step and precise manner for pyrolysis, without the need for additional fuel.

[0080] According to the common way of the prior art, only a single boiler flue gas source is used without mixing and dynamic oxygen content control, a corresponding comparative example is provided:

[0081] The scenario is set to assume that an attempt is made to process the waste wind power blades on a power plant boiler of the same 350 MW, 50% load. A stream of flue gas is extracted from the high-temperature flue of the boiler (high-temperature section, about 720°C), without any mixing or oxygen content adjustment, and is directly sent into a modified pyrolysis furnace through a simple fan.

[0082] During operation, the initial state flue gas temperature is about 720°C, and the oxygen content is about 7-8%. The flue gas temperature of 720°C is fast for many composites, and the initial oxygen content of 7-8% is already at a high level. In the pyrolysis furnace, when the pyrolysis reaction begins to release a large amount of combustible gas (such as H2, CO, CH4, etc.), the mixing ratio of oxygen concentration and combustible gas concentration in the local area is easy to enter the explosion limit range. During the pyrolysis process, at a certain time, a higher concentration of hydrogen (H2) is generated in the local area of the pyrolysis furnace due to material accumulation or uneven temperature. At this time, the oxygen content (still close to 7-8%) and H2 concentration in this area reach the lower limit of H2 explosion (about 4% in air). Just encounter a high-temperature hot spot or static spark, and a local flash explosion or deflagration occurs instantaneously. The risk accumulation may cause: internal damage of the pyrolysis furnace (furnace lining, temperature measuring element, sight glass, etc.); may cause a fire, damaging the material to be processed or the recovered fibers; emergency shutdown, causing production interruption and safety accidents; the pyrolysis gas pipeline may be damaged, causing combustible gas leakage, forming secondary risks. Even if no explosion occurs, the higher oxygen content will cause part of the pyrolysis products (especially tar and part of the gas) to partially oxidize and burn in the furnace, rather than pure pyrolysis, which causes the target recovered fibers to be ablated or contaminated, the quality further decreases, the expected pyrolysis gas yield and components are unstable, the calorific value fluctuates greatly, it is difficult to effectively reuse, and the temperature in the furnace is more difficult to control (oxidation exothermic interferes with the heat absorption process of pyrolysis).

[0083] This comparative scheme cannot solve the core contradiction of safe and efficient pyrolysis using boiler flue gas. Uncontrollable temperature (single low-temperature source leading to incomplete pyrolysis) and uncontrollable oxygen content (high-oxygen environment leading to serious safety hazards and side reactions) are fatal defects. Not only can it not achieve safe and effective recovery of waste blades, but it also introduces huge safety risks (explosion) and operational instability, leading to equipment damage and production interruption, which is extremely poor in economy and safety.

[0084] Through the comparison of examples and comparative examples, it is intuitively clear that the key technology of the mixed flue system + nitrogen air flue + controller synergistic regulation and control of the application safely, stably and flexibly utilizes fluctuating boiler hot flue gas (different temperatures, oxygen-containing) to provide suitable (specific temperature, extremely low oxygen) heat-carrying medium for pyrolysis. Overcome the problem that the prior art (such as the simple extraction of single flue gas in the comparative example) cannot provide a suitable pyrolysis temperature, and through the mixing of flue gas with different temperature levels, wide-range, flexible and stable adjustment of the temperature is achieved. More importantly, it overcomes the problem that the prior art cannot control the oxygen content, which brings low fiber quality, huge safety hazards (deflagration, explosion) and side reactions (oxidation combustion), through precise nitrogen mixing and closed-loop control, the oxygen content is strictly suppressed at the level of fiber high-value utilization and safe operation, ensuring the fiber quality and the intrinsic safety of the pyrolysis process. The synergistic control of the mixed flue system and the nitrogen air flue makes it possible to utilize the complex and variable flue gas conditions of the power station boiler for safe, efficient and continuous pyrolysis and recovery, and realizes the true "synergistic" value. It is an important breakthrough of the application, and compared with the prior art, the utilization of boiler flue gas for blade pyrolysis is not feasible in terms of safety and effect.

[0085] The booster fan provides power for the mixed flue gas and nitrogen to enter the pyrolysis furnace and the flue gas after pyrolysis to flow back to the furnace of the power station boiler, and prevents the leakage of ambient air into the pyrolysis furnace and its inlet flue to cause uncontrollable oxygen content. In order to further analyze the effect of this technology, an example is provided:

[0086] The set scene is a 350 MW power station boiler cooperating with the processing of abandoned wind power blades. The pyrolysis furnace is operating normally, and the internal temperature of the pyrolysis furnace is stabilized at about 580°C.

[0087] The specific process includes:

[0088] 1. Pyrolysis gas generation: The resin matrix in the wind power blade is cracked in the high-temperature and oxygen-deficient environment in the pyrolysis furnace, producing a mixed gas mainly composed of hydrogen (H2), carbon monoxide (CO), methane (CH4), a small amount of other hydrocarbons and carbon dioxide (CO2), i.e. pyrolysis gas.

[0089] 2. Pyrolysis gas transportation and monitoring: The pyrolysis gas is discharged from the pyrolysis furnace flue gas outlet together with the heat-carrying flue gas, and is guided to the furnace of the power station boiler through the outlet flue. Before entering the outlet flue, a gas analyzer is installed to continuously monitor the composition of the flue gas, and real-time display of hydrogen, carbon monoxide, methane, carbon dioxide, oxygen and nitrogen concentration and other key data.

[0090] 3. Safe back-firing and energy recovery: The mixed flue gas containing combustible gas is directly injected into the furnace. The furnace is the highest temperature area in the boiler (usually much higher than 1000°C), and there is a large amount of combustion air and turbulent mixing conditions. The pyrolysis gas is instantaneously ignited and completely burned in this place.

[0091] Safe elimination: High temperature and sufficient residence time ensure that all combustible components (H2, CO, CH4, etc.) are thoroughly oxidized and decomposed, eliminating the risk of their accumulation and reaching the explosion limit in the pyrolysis furnace downstream or in a separate exhaust pipeline.

[0092] Energy recovery: The heat released by the combustion of pyrolysis gas is directly supplemented into the boiler's steam generation system, improving the overall thermal efficiency of the boiler. This is equivalent to recycling part of the chemical energy in the discarded blades for power generation.

[0093] Environmentally friendly disposal: Pollutants (mainly NO x , SO2, and particulate matter) produced by the combustion of pyrolysis gas are combined with the flue gas produced by the combustion of the main fuel of the boiler and enter the high-efficiency flue gas purification equipment (denitrification, dust removal, desulfurization) at the tail of the boiler for treatment, ultimately achieving standard emissions. The data from the gas analyzer are also used to evaluate the pyrolysis efficiency and energy recovery benefits.

[0094] This design achieves high-quality recycling of fibers, safe disposal of pyrolysis gas (instantly burned in a controllable high-temperature environment), efficient energy recovery (using existing boiler facilities without additional combustion equipment), and environmentally compliant emissions (relying on mature purification systems). The gas analyzer provides key safety monitoring (confirming low oxygen and no abnormally high concentration of combustible materials) and process optimization basis.

[0095] According to the common way in the existing technology, the pyrolysis gas is not recirculated to the boiler or simply discharged / treated, and a corresponding comparative example is provided for this case:

[0096] The set scene is an independent waste wind turbine blade pyrolysis plant (not coordinated with the power station boiler).

[0097] During operation, three pyrolysis gas disposal schemes are provided, including:

[0098] Pyrolysis gas disposal scheme A (flare combustion): The plant passes the pyrolysis gas into a high-altitude flare for combustion treatment. The heat value of the pyrolysis gas is completely wasted in the atmosphere, and is not recycled and utilized, which is poor in economic operation. The flare is affected by wind speed, air pressure, and gas composition fluctuations, and may not burn completely, producing black smoke (carbon particles), carbon monoxide (CO), and unburned volatile organic compounds (VOCs), causing air pollution and possibly violating environmental regulations. The continuously burning flare produces significant light pollution and noise, which is not friendly to the surrounding environment. The open flame device itself has a certain psychological pressure on safety.

[0099] Pyrolysis gas disposal scheme B (simple purification and direct discharge): The plant attempts to simply cool, filter, and then directly discharge the pyrolysis gas through a chimney. Pyrolysis gas contains combustible gases, and once mixed with air to reach the explosion limit in the discharge pipeline or chimney, a spark (static electricity, equipment friction, etc.) can cause a catastrophic explosion, which is extremely dangerous. Directly discharging pyrolysis gas without combustion treatment means discharging a large amount of hydrogen, carbon monoxide, methane, VOCs (toxic and harmful volatile organic compounds) directly into the atmosphere. This not only causes greenhouse gas (methane) emissions, but also forms photochemical smog precursors (VOCs, NO x may be accompanied), seriously polluting the environment, and inevitably violating the most stringent environmental regulations, facing huge fines and shutdown risks. Some pyrolysis products may have a foul odor or toxicity (such as nitrogen-, sulfur-, and chlorine-containing organic compounds), directly affecting the health and quality of life of surrounding residents.

[0100] Pyrolysis gas disposal scheme C (independent small combustion furnace): The plant specially configures a small combustion furnace for pyrolysis gas incineration. Additional investment is needed to build the combustion furnace, supporting fuel supply (may need auxiliary fuel to start and stabilize combustion), air supply system, high-temperature resistant materials, and independent flue gas purification equipment (denitration, dust removal, etc.), significantly increasing investment and operating costs. The combustion and purification system needs to be independently operated and maintained, increasing the complexity of operation. The thermal efficiency of a small combustion furnace is usually lower than that of a large power station boiler, and the energy recovery efficiency is poor. The scale of the flue gas purification system is small, and the treatment efficiency and stability may not be as good as the mature system of a large power station. The output of pyrolysis gas fluctuates with the amount of blade processing, and a small combustion furnace is difficult to quickly and stably match such fluctuations, which may result in frequent start-stop or unstable combustion (low efficiency, poor emissions).

[0101] As can be seen, the existing technology (whether torch, direct discharge, or independent combustion furnace) has serious safety hazards (explosion), environmental pollution risks (VOCs, CO, greenhouse gases, etc.), energy waste, and / or high additional investment and operating costs when disposing of pyrolysis gas. Although the independent small combustion furnace can solve the safety and part of the pollution problems, the economy and efficiency are much lower than the scheme of the present application.

[0102] By comparing the examples with the comparative examples, it is clear that the key technical feature of the pyrolysis furnace flue gas outlet connected to the power plant boiler furnace + outlet flue gas setting gas analyzer in the application realizes the key effect of safe, environmentally friendly and economic disposal of flammable and explosive and polluting combustible gas generated in the pyrolysis process. The natural advantages of the existing power plant boiler, such as large capacity, ultra-high temperature, strong turbulent mixing and complete purification facilities, provide the most reliable and most thorough destruction (combustion) environment for pyrolysis gas, which essentially eliminates the risk of explosion. Realize the efficient recovery of pyrolysis gas chemical energy (improve the efficiency of the boiler), significantly improve the economy of the entire collaborative processing system. Ensure that the pollutants derived from the pyrolysis gas can be treated in compliance through the mature, efficient and large tail purification system of the boiler, avoiding secondary pollution. The gas analyzer provides key real-time safety monitoring (confirming low oxygen, no abnormalities) and process optimization data. The prior art shown in the comparative example will become a huge bottleneck in technology, safety, environmental protection and economy for the independent pyrolysis plant, and even may make the entire project unfeasible. The application scheme ingeniously realizes the deep cooperation of waste resource processing and large-scale energy infrastructure.

[0103] In another technical solution, the oxygen measurement point of the mixing flue is the first oxygen measurement point, and the flue gas inlet of the pyrolysis furnace is further provided with a second oxygen measurement point, and the controller acquires the initial oxygen content signal of the flue gas at the first oxygen measurement point and the target oxygen content signal of the flue gas at the second oxygen measurement point; based on the initial oxygen content signal of the flue gas and the preset target value of the oxygen content range required for the pyrolysis reaction, and combined with the real-time load state signal of the power plant boiler, the required nitrogen mixing amount is calculated through a feedforward-feedback control algorithm;

[0104] The controller generates and outputs a control signal to the regulating valve to dynamically adjust the opening degree to mix the calculated required nitrogen mixing amount into the mixing flue; when the oxygen content value monitored by the second oxygen measurement point exceeds the upper limit of the preset oxygen content range required for the pyrolysis reaction, the controller controls the opening degree of the regulating valve to increase to increase the nitrogen mixing amount; when the oxygen content value monitored by the second oxygen measurement point is lower than the lower limit of the preset range, the controller controls the opening degree of the regulating valve to decrease to reduce the nitrogen mixing amount.

[0105] The system sets a first oxygen measurement point (initial oxygen monitoring) in the mixed flue, and a second oxygen measurement point (target oxygen monitoring) at the inlet of the pyrolysis furnace flue gas. The controller synchronously receives the real-time load signal of the boiler (such as 50%, 75% operating state, etc.), and combines the preset target value of the oxygen range required for pyrolysis reaction (for example, 4%-7%). The first measurement point detects the original oxygen content of the boiler flue gas, and the second measurement point monitors the actual oxygen content after mixing with nitrogen, i.e. the target oxygen content. The controller uses a feedforward-feedback composite algorithm, the feedforward part predicts the change of flue gas flow according to the boiler load (such as the oxygen content of flue gas decreases when the load increases), and the feedback part compares the second measurement point data with the target range in real time. The target oxygen content range can be set to 4%-7% (ideal oxygen content for high-value recovery of glass fibers), and the preset upper limit of 7.5% triggers an increase in nitrogen, and the lower limit of 6.5% triggers the stop of nitrogen mixing.

[0106] In the dynamic nitrogen regulation process, the initial state is that the boiler load is 50%, the first measurement point oxygen content is 8%, and the target oxygen content needs to be maintained at 6.5%. The feedforward calculation is that when the load increases to 75%, the predicted flue gas oxygen content decreases to 5%, and the controller reduces the nitrogen valve opening to 5%. Feedback correction: the second measurement point shows that the oxygen content is 4.5% (close to the lower limit of 4%), and the controller outputs a signal to close the nitrogen regulation valve and the shut-off valve. Continuous control: if the oxygen content suddenly rises to 7.5% (above the upper limit), the regulation valve and the shut-off valve are triggered to open, and the regulation valve opening is increased by 5% to 6.5% oxygen content.

[0107] In another technical solution, a diffuser pipeline is provided at the outlet flue of the pyrolysis furnace, the diffuser pipeline is connected to the atmosphere and is provided with a shut-off valve, and a gas analyzer is used to monitor the concentration of combustible gas in the flue gas at the outlet of the pyrolysis furnace in real time. When the power station boiler needs to be shut down and the system needs to be removed, the controller performs the following time sequence operations:

[0108] Immediately close all shut-off dampers and regulating dampers on the high-temperature flue, medium-temperature flue and low-temperature flue, and cut off the flue gas heat source; open the total valve of the nitrogen air duct and adjust the regulating valve to the fully open state to inject nitrogen into the mixed flue for purging; at the same time, open the diffuser pipeline shut-off valve and close the damper connecting the outlet flue of the pyrolysis furnace to the boiler furnace, so that the purging gas is discharged to the atmosphere through the diffuser pipeline;

[0109] Continue to operate the booster fan and monitor the data of the gas analyzer. When the concentration of combustible gas is zero for 15 minutes, stop the operation of the booster fan; after the chain grate completely transports the solid residues in the furnace, stop the chain grate;

[0110] Finally, close the regulating valve and total valve of the nitrogen air duct, and when the temperature difference between each temperature measurement point of the pyrolysis furnace and the ambient temperature is less than 5°C and maintained for 15 minutes, close the diffuser pipeline shut-off valve.

[0111] A venting pipeline (with a shut-off valve) is arranged at the outlet flue of the pyrolysis furnace, which is connected to the atmosphere as an emergency discharge path. A gas analyzer monitors the concentration of combustible gases (such as H2, CO, CH4) in real time, and the controller is interlocked with the boiler shutdown signal. When the boiler is shut down, the heat-carrying flue gas is interrupted, and the residual combustible gas in the pyrolysis furnace needs to be urgently vented. The venting pipeline cooperates with the nitrogen purging system to form a double insurance mechanism of inerting and discharging.

[0112] The timing shutdown operation adopted includes the following steps:

[0113] Step 1 (0-10 seconds): The boiler shutdown signal triggers, immediately closes all dampers of high / medium / low temperature flues, and cuts off the heat source.

[0114] Step 2 (10-30 seconds): Open the nitrogen main valve, adjust the valve to full open, and purge the pyrolysis furnace and outlet flue. At the same time, open the venting pipe shut-off valve and close the damper from the pyrolysis furnace to the boiler.

[0115] Step 3 (30 seconds-15 minutes): Maintain the operation of the booster fan, and the gas analyzer continuously monitors. When the combustible gas concentration is 0% for 15 minutes (for example, H2<0.1%, CO<0.05%), stop the fan.

[0116] Step 4: After the chain grate slagging is completed, stop the rotation, and finally close the nitrogen valve. When the temperature difference between the furnace and the environment is <5℃ (for example, 60℃ drops to 35℃) for 15 minutes, close the venting valve.

[0117] Parameter value example: The combustible gas concentration threshold is set to 0% (absolute inerting is required), and the temperature difference threshold is 5℃ (to prevent residual heat ignition). This solves the industry problem of pyrolysis gas accumulation explosion in sudden shutdown conditions. Through strict timing control, the safe shutdown of the equipment and zero intervention of personnel are ensured.

[0118] In another technical solution, a thermocouple group and a flue gas distribution valve system are arranged inside the pyrolysis furnace; at least three groups of thermocouples are arranged in parallel along the width direction of the furnace body in the central area and the two side edge areas inside the pyrolysis furnace; the controller receives the fiber detachment state image signal from the visual monitoring device and the temperature signal from the thermocouple group at the same time, and performs the following operations:

[0119] The visual feature parameters of the fiber surface are extracted by image recognition algorithm, including color depth value and texture edge displacement amount; if the color depth value is higher than the set threshold, the target temperature setting value of the pyrolysis furnace is increased by 5-10℃; if the texture edge displacement amount per unit time is lower than the preset value, the chain grate rotation speed is reduced by 10%-25% to prolong the material residence time;

[0120] Real-time comparison of the temperature data of each group of thermocouples along the width direction of the pyrolysis furnace. If the temperature detected by any thermocouple inside the pyrolysis furnace exceeds the preset upper limit, immediately reduce the high-temperature flue gas branch valve opening of the corresponding area by 20-30%, and simultaneously increase the low-temperature flue gas branch valve opening by 15-25%. If the temperature does not decrease by at least 20°C below the preset upper limit within 60 seconds, close the high-temperature flue gas branch valve. If the temperature detected by any thermocouple inside the pyrolysis furnace exceeds the preset lower limit, immediately reduce the low-temperature flue gas branch valve opening of the corresponding area by 20-30%, and simultaneously increase the high-temperature flue gas branch valve opening by 15-25%. If the temperature does not increase by at least 20°C above the preset lower limit within 60 seconds, close the low-temperature flue gas branch valve.

[0121] If all thermocouple temperatures do not exceed the upper and lower limits, but the temperature difference between any two groups exceeds 30°C for 3 minutes, increase the high-temperature flue gas branch valve opening of the low-temperature area by 10-15%, and decrease the low-temperature flue gas branch valve opening by 5-10%. Decrease the high-temperature flue gas branch valve opening of the high-temperature area by 5-10%, and increase the low-temperature flue gas branch valve opening by 8-12%. Review the temperature difference every 30 seconds until the temperature difference ΔT ≤ 20°C to stop adjusting.

[0122] The pyrolysis furnace is equipped with independent thermocouple groups (such as K-type thermocouples) and a flue gas distribution valve system (including high / medium / low temperature branch valves). At least three groups of thermocouples (one group in the center + one group on each side edge) are arranged along the width direction inside the pyrolysis furnace to monitor the temperature field distribution. A visual monitoring device (such as a high-temperature industrial camera) captures the fiber surface state.

[0123] The visual device extracts the following information through image recognition algorithms: color depth value (0-1, 0=pure white, 1=full black), reflecting the degree of carbon residue, with a threshold of 0.8 (gray-white fibers are qualified, dark gray fibers are over standard); texture edge displacement (pixels / second), reflecting the resin detachment rate, with a threshold of 5 pixels / second (slow displacement indicates insufficient reaction).

[0124] When the color depth value of a batch of fibers is detected to be 0.85 (>0.8), the controller increases the oxygen amount by 1%.

[0125] The flue gas distribution valve system includes independently controlled high-temperature (700-1000°C), medium-temperature (400-700°C), and low-temperature (300-400°C) branch valves. The controller performs two-level regulation:

[0126] Local over-temperature treatment (>600-650°C): preferentially reduce the high-temperature branch valve opening by 25% (e.g., from 70% to 45%), and increase the low-temperature branch valve opening by 20% (e.g., from 30% to 50%). If the temperature does not decrease by at least 20°C below the preset upper limit (e.g., from 600°C to ≤580°C) within 60 seconds, close the high-temperature branch valve.

[0127] Temperature field imbalance processing (ΔT>30℃ for 3 minutes): for low temperature area: open high temperature valve 10%, close small low temperature valve 8% (for example: high temperature valve opening degree 40% to 50%, low temperature valve opening degree 60% to 52%); for high temperature area: close small high temperature valve 8%, open large low temperature valve 10% (for example: high temperature valve 80% to 72%, low temperature valve 20% to 30%).

[0128] The preferred regulation termination meets the double conditions: all area temperatures are stable within the preset upper limit-20℃ safety margin (for example, 600℃ system needs to be ≤580℃); the temperature difference between any two points in the furnace width direction is ≤20℃ (fiber quality consistency requirement).

[0129] Specific implementation process example:

[0130] Initial state: center-left-right temperature=580℃ / 540℃ / 620℃ (ΔT left-center=40℃, right over temperature);

[0131] First, process the right over temperature: close high temperature valve 25%, open low temperature valve 20%, adjust for 5 minutes, then drop to 585℃;

[0132] Then, process the left low temperature: open left high temperature valve 10%, close left low temperature valve 8%, after adjustment, left side rises to 560℃;

[0133] Adjusted temperature: center 580℃ / left side 560℃ / right side 585℃, maximum ΔT after adjustment=25℃>20℃;

[0134] Continue fine tuning: right side close high temperature valve 5%, after adjustment, temperature drops to 575℃, left side opens high temperature valve 5% again, temperature rises to 565℃;

[0135] Final temperature: center 580℃ / left side 565℃ / right side 575℃ (ΔT≤15℃), stop adjustment.

[0136] Through the double closed loop of fiber visual quality feedback and real-time temperature field regulation, the carbon residual rate is reduced to a negligible level; using the principle of low temperature flue gas preferential cooling, more than 90% of nitrogen consumption is reduced, and the oxygen amount control main function is ensured; solving the problem of uneven temperature caused by edge heat loss of wide furnace, improving the consistency of fiber recovery quality to industrial standard. Fiber color and strength meet the direct recycling standard, without secondary treatment; over-temperature emergency response time is shortened to minutes, eliminating the risk of fiber overheating degradation; temperature field balance and fiber desorption state linkage control, realizing process parameter self-adaptive optimization.

[0137] In another technical solution, the controller receives in real time the flue gas inlet temperature T1 detected by the mixed flue temperature measuring point, the average furnace temperature T2 detected by the pyrolysis furnace internal thermocouple, and the oxygen concentration O detected by the second oxygen measuring point arranged at the flue gas inlet of the pyrolysis furnace; the controller calculates the real-time flue gas temperature T = 0.6T1 + 0.4T2, and calculates the pyrolysis intensity factor K according to the real-time flue gas temperature T and the oxygen concentration O, and the calculation formula is: wherein, T ref is the predetermined pyrolysis optimal temperature mean value, O ref is the expected oxygen mean value, and a and β are temperature dominant weight coefficients.

[0138] The following synchronous adjustment operations are performed according to the pyrolysis intensity factor value:

[0139] When the pyrolysis intensity factor is lower than the preset lower limit threshold, the medium-temperature flue adjusting baffle opening degree is increased to increase the flue gas temperature, and the nitrogen air duct adjusting valve opening degree is reduced to increase the oxygen concentration;

[0140] When the pyrolysis intensity factor is higher than the preset upper limit threshold, the medium-temperature flue adjusting baffle opening degree is reduced to reduce the flue gas temperature, and the nitrogen air duct adjusting valve opening degree is increased to reduce the oxygen concentration;

[0141] If the pyrolysis furnace outlet flue gas temperature deviates from the expected temperature range after adjustment, the adjusting baffle opening degree of the high-temperature flue or the low-temperature flue is further adjusted.

[0142] The controller receives in real time the power station boiler load signal and the temperature change rate data detected by the pyrolysis furnace internal thermocouple; when the boiler load change rate continuously exceeds 5% / min for 2 minutes, it is judged as load sudden drop or load sudden rise, and the following operations are performed:

[0143] When the load suddenly drops, the chain grate speed is reduced to 70% of the original speed, and the material residence time in the pyrolysis furnace is prolonged; when the load suddenly rises, the chain grate speed is increased to 130% of the original speed, and the material residence time in the pyrolysis furnace is shortened; the pyrolysis intensity factor calculation is frozen for 5 minutes, and the current flue gas adjusting baffle and nitrogen valve opening degree are maintained unchanged; when the main thermocouple temperature change rate returns to within ±5℃ / min, the pyrolysis intensity factor calculation is reactivated and the speed freezing is released.

[0144] The controller collects the mixed flue inlet temperature T1 (reflecting heat source input), the average temperature T2 in the pyrolysis furnace (reflecting the actual reaction state), and the oxygen concentration O at the flue gas inlet (safety index) in real time. Through weighted calculation, the parameters are fused into a single index, the pyrolysis intensity factor K, which is essentially a dimensionless value representing the current comprehensive strength of the pyrolysis reaction. The temperature component (T): take the weighted average of T1 and T2 (such as T = 0.6T1 + 0.4T2), which reflects the balance between heat supply and furnace response. The oxygen component (O): directly use the data from the second oxygen measurement point to control the safety boundary.

[0145] The control mechanism based on the pyrolysis intensity factor breaks through the limitations of traditional single-parameter control, achieving a three-way optimization of temperature, oxygen, and reaction products. This significantly improves the self-adaptive ability of the pyrolysis process under varying conditions, avoiding scenarios such as "temperature qualified but fiber carbonization" or "oxygen safe but pyrolysis stagnation."

[0146] When the power station boiler load change rate exceeds 3% / min for 3 consecutive minutes, dynamically correct the temperature weight coefficient α based on the load change direction:

[0147] When the load rises, increase the flue gas temperature weight coefficient α to 1.2 times the original value;

[0148] When the load decreases, reduce the flue gas temperature weight coefficient α to 0.8 times the original value;

[0149] Before the controller executes the synchronous adjustment operation according to the corrected pyrolysis intensity factor value, it verifies it through the rate of change of the thermocouple temperature in the pyrolysis furnace. If the temperature change rate contradicts the direction of change of the pyrolysis intensity factor, it freezes the adjustment command and starts the manual intervention alarm.

[0150] The controller dynamically corrects the weight coefficients β (oxygen weight) and α (temperature weight) in the K factor calculation formula according to the boiler load mutation (change rate > 3% / min). When the load rises, it strengthens the temperature weight (α × 1.2) to quickly match the heat demand; when the load decreases, it weakens the temperature weight (α × 0.8) to prevent overheating.

[0151] When the load suddenly rises, for example, the load changes from 70% to 75% within 3 minutes (change rate > 3% / min), α increases from 0.5 to 0.6. If the thermocouple temperature change rate is +8℃ / min (consistent with the direction of K change), execute the baffle adjustment; if the temperature does not change, freeze the adjustment. This solves the secondary risk caused by mechanical execution of K factor in extreme conditions, establishes a "correction-verification" double insurance for control logic, and enables the pyrolysis system to remain safe and efficient during the period of severe boiler fluctuations.

[0152] The controller receives the power plant boiler load signal and the pyrolysis furnace temperature change rate data detected by the thermocouple in real time; when the boiler load change rate exceeds 5% / min for 2 minutes in succession, it is determined that there is a load sudden drop or a load sudden rise, and the following operations are performed:

[0153] When the load suddenly drops, the chain grate speed is reduced to 70% of the original speed, and the residence time of the material in the pyrolysis furnace is extended; when the load suddenly rises, the chain grate speed is increased to 130% of the original speed, and the residence time of the material in the pyrolysis furnace is shortened; the calculation of the pyrolysis intensity factor is frozen for 5 minutes, and the current flue gas adjusting damper and nitrogen valve opening degree are maintained unchanged; when the main thermocouple temperature change rate returns to within ±5℃ / min, the calculation of the pyrolysis intensity factor is reactivated and the speed freezing is released.

[0154] The controller monitors the boiler load change rate (e.g., the percentage of increase / decrease per minute) in real time, and determines that there is a “sudden rise / sudden drop” when the change rate exceeds 5% / min for 2 minutes in succession. The pyrolysis furnace temperature change rate data (e.g., ℃ / min) are received synchronously. The load fluctuation causes the flue gas flow / temperature to change rapidly, so the material reaction state needs to be stabilized first, and therefore the calculation of the pyrolysis intensity factor is frozen, and the chain grate speed is used to adjust and compensate the temperature inertia.

[0155] As a specific implementation example: when the load suddenly drops from 100% of the set value to 90%, the chain speed is reduced to 70% (e.g., 1 m / min to 0.7 m / min), and the residence time in the pyrolysis furnace is extended to 1.4 times the original. The K factor calculation is frozen for 5 minutes, and the current flue gas / nitrogen valve opening degree is maintained. When the load suddenly rises from 60% to 68%, the chain speed is increased to 130% (e.g., 1 m / min to 1.3 m / min), and the residence time of the material is shortened. The K calculation is frozen, and the damper opening degree is unchanged. The recovery condition is that the main thermocouple temperature change rate is stable within ±5℃ / min (e.g., -3℃ / min), and the K factor regulation is restarted. In the deep peak shaving condition of the boiler, the material is prevented from being “half-cooked” (when suddenly dropped) or “overcooked” (when suddenly risen). Through the speed-temperature change rate linkage, the temperature is smoothly transitioned without overshoot.

[0156] The number of devices and the processing scale described herein are used to simplify the description of the present application. Applications, modifications and variations of the present application are obvious to those skilled in the art.

[0157] Although the embodiments of the present application have been disclosed as above, they are not limited to the applications and embodiments listed in the specification, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A pyrolysis recycling system for co-processing waste wind turbine blades with a power plant boiler, characterized in that, The utility model relates to a kind of pyrolysis system of waste wind power blade, comprising: A power plant boiler is provided with hearth, horizontal flue, turning chamber and tail flue in turn along the direction of flue gas flow; A pyrolysis furnace is provided with waste wind power blade inlet, fiber outlet, flue gas inlet and flue gas outlet; A mixed flue is connected to the flue gas inlet of the pyrolysis furnace by booster fan, and the inlet of the mixed flue is connected to high-temperature flue, medium-temperature flue and low-temperature flue, wherein the inlet of the high-temperature flue is communicated to the horizontal flue, the inlet of the medium-temperature flue is communicated to the turning chamber, and the inlet of the low-temperature flue is communicated to the tail flue; The high-temperature flue, medium-temperature flue and low-temperature flue are respectively installed with closing damper and adjusting damper, and the mixed flue is provided with oxygen measuring point and temperature measuring point; A nitrogen air duct is connected to the inlet of the mixed flue, and the nitrogen air duct is provided with an adjusting valve; The flue gas outlet of the pyrolysis furnace is connected to the hearth of the power plant boiler through the pyrolysis furnace outlet flue, and the pyrolysis furnace outlet flue is provided with a gas analyzer, the pyrolysis furnace is provided with a thermocouple and is equipped with a chain grate for conveying waste wind power blades and fibers, and the pyrolysis furnace is provided with a visual monitoring device for observing the fiber discharge condition; A flue gas purification device is connected to the rear of the tail flue of the power plant boiler, and comprises a denitration device, a dust removal device and a desulfurization device; A controller is connected to the oxygen measuring point and the temperature measuring point of the mixed flue, the adjusting valve of the nitrogen air duct, the thermocouple of the pyrolysis furnace, the visual monitoring device, the driving motor of the chain grate, the gas analyzer and the load monitoring device of the power plant boiler, and controls the execution mechanism of the high-temperature flue, medium-temperature flue and low-temperature flue adjusting damper through signal control, and is configured to perform oxygen control, temperature adjustment, fiber quality protection and safety control operation during pyrolysis.

2. The pyrolysis recovery system of waste wind power blades for co-processing in a power plant boiler according to claim 1, characterized in that, The oxygen measuring point of the mixed flue is a first oxygen measuring point, and the flue gas inlet of the pyrolysis furnace is also provided with a second oxygen measuring point, and the controller obtains the initial oxygen content signal of the flue gas at the first oxygen measuring point and the target oxygen content signal of the flue gas at the second oxygen measuring point; Based on the initial oxygen content signal of the flue gas and the preset oxygen content range target value required for pyrolysis reaction, and combined with the real-time load state signal of the power plant boiler, the required nitrogen mixing amount is calculated through feedforward-feedback control algorithm; The controller generates and outputs control signal to the adjusting valve, dynamically adjusts the opening degree to mix the calculated required nitrogen mixing amount into the mixed flue, and when the oxygen content value monitored by the second oxygen measuring point exceeds the upper limit of the preset oxygen content range required for pyrolysis reaction, the controller controls the opening degree of the adjusting valve to increase to increase the nitrogen mixing amount; When the oxygen content value monitored by the second oxygen measuring point is lower than the lower limit of the preset range, the controller controls the opening degree of the adjusting valve to decrease to reduce the nitrogen mixing amount.

3. The pyrolysis recovery system of waste wind power blades for co-processing in a power plant boiler according to claim 1, characterized in that, The pyrolysis furnace outlet flue is provided with a diffuser pipeline connected to the atmosphere and installed with a shut-off valve, and the gas analyzer monitors the concentration of combustible gas in the flue gas outlet of the pyrolysis furnace in real time, and when the power plant boiler needs to be shut down to release the system coordination, the controller performs the following time sequence operation: Immediately close all closing and regulating dampers on high-temperature flue, medium-temperature flue and low-temperature flue, and cut off the heat source of flue gas; open the total valve of nitrogen gas duct and adjust the regulating valve to full open state, inject nitrogen into the mixed flue for purging; at the same time, open the blow-off pipeline shut-off valve and close the damper connecting the pyrolysis furnace outlet flue to the boiler furnace, so that the purging gas is discharged to the atmosphere through the blow-off pipeline; Continue to operate the booster fan and monitor the data of the gas analyzer. When the concentration of combustible gas is zero for 15 minutes, stop the operation of the booster fan; after the chain grate has transported all the solid residues in the furnace, stop the chain grate; Finally, close the regulating valve and total valve of the nitrogen gas duct, and close the blow-off pipeline shut-off valve when the difference between the temperature of each measuring point of the pyrolysis furnace and the ambient temperature is less than 5℃ and maintained for 15 minutes.

4. The pyrolysis recovery system of waste wind power blades for co-processing in a power plant boiler according to claim 1, characterized in that, The pyrolysis furnace is internally configured with a thermocouple group and a flue gas distribution valve system; at least three groups of thermocouples are arranged in parallel along the width direction of the furnace body in the central area and the two side edge areas inside the pyrolysis furnace; the controller simultaneously receives the fiber desorption state image signal from the visual monitoring device and the temperature signal of the thermocouple group, and performs the following operations: Extract the visual feature parameters of the fiber surface by image recognition algorithm, including color depth value and texture edge displacement amount; if the color depth value is higher than the set threshold value, increase the target temperature setting value of the pyrolysis furnace by 5-10℃; if the texture edge displacement amount per unit time is lower than the preset value, reduce the chain grate speed by 10%-25% to prolong the residence time of the material; Real-time comparison of the synchronous temperature data of each group of thermocouples along the furnace width direction inside the pyrolysis furnace, if the temperature detected by any thermocouple inside the pyrolysis furnace exceeds the preset upper temperature limit, immediately reduce the opening degree of the high-temperature flue gas branch valve in the corresponding area by 20%-30%, and simultaneously increase the opening degree of the low-temperature flue gas branch valve by 15%-25%; if the temperature does not decrease by at least 20℃ below the preset upper limit within 60 seconds, close the high-temperature flue gas branch valve; if the temperature detected by any thermocouple inside the pyrolysis furnace exceeds the preset lower temperature limit, immediately reduce the opening degree of the low-temperature flue gas branch valve in the corresponding area by 20%-30%, and simultaneously increase the opening degree of the high-temperature flue gas branch valve by 15%-25%; if the temperature does not increase by at least 20℃ above the preset lower limit within 60 seconds, close the low-temperature flue gas branch valve; If all thermocouple temperatures do not exceed the temperature upper and lower limits, but the temperature difference between any two groups continues to be >30℃ for 3 minutes, increase the opening degree of the high-temperature flue gas branch valve in the low-temperature area by 10%-15%, and decrease the opening degree of the low-temperature flue gas branch valve by 5%-10%; decrease the opening degree of the high-temperature flue gas branch valve in the high-temperature area by 5%-10%, and increase the opening degree of the low-temperature flue gas branch valve by 8%-12%; review the temperature difference every 30 seconds until the temperature difference ΔT≤20℃ to stop adjusting.

5. The pyrolysis recovery system of waste wind power blades for co-processing in a power plant boiler according to claim 1, characterized in that, The controller receives in real-time the flue gas inlet temperature T1 detected by the temperature measuring point in the mixing flue, the average furnace temperature T2 detected by the thermocouple inside the pyrolysis furnace, and the oxygen concentration O measured by the second oxygen measuring point set on the flue gas inlet of the pyrolysis furnace. The controller calculates the real-time flue gas temperature T = 0.6T1 + 0.4T2, and calculates the pyrolysis intensity factor K based on the weighted average of the real-time flue gas temperature T and the oxygen concentration O. The calculation formula is as follows: , among which, T ref O is the median of the predetermined optimal pyrolysis temperature. ref The median expected oxygen content is represented by α and β, which are temperature-dominant weighting coefficients. According to the pyrolysis intensity factor value, the following synchronous adjustment operations are performed: When the pyrolysis intensity factor is lower than the preset lower limit threshold, increase the opening degree of the medium-temperature flue regulating damper to increase the flue gas temperature, and at the same time, decrease the opening degree of the nitrogen gas duct regulating valve to increase the oxygen concentration; When the pyrolysis intensity factor is higher than the preset upper limit threshold, decrease the opening degree of the medium-temperature flue regulating damper to decrease the flue gas temperature, and at the same time, increase the opening degree of the nitrogen gas duct regulating valve to decrease the oxygen concentration; If the pyrolysis furnace outlet flue gas temperature continues to deviate from the expected temperature range after adjustment, further adjust the opening of the high-temperature flue or low-temperature flue adjustment damper.

6. The pyrolysis recovery system of waste wind power blades for co-processing in a power plant boiler according to claim 5, characterized in that, The controller receives the power plant boiler load signal in real time and performs the following operations: When the power plant boiler load change rate exceeds 3% / min for 3 consecutive minutes, dynamically correct the temperature weight coefficient α based on the load change direction: When the load rises, increase the flue gas temperature weight coefficient α to 1.2 times the original value; When the load decreases, reduce the flue gas temperature weight coefficient α to 0.8 times the original value; Before the controller performs synchronous adjustment operation according to the corrected pyrolysis intensity factor value, verify it through the rate of change of the thermocouple temperature in the pyrolysis furnace. If the temperature change rate contradicts the direction of change of the pyrolysis intensity factor, freeze the adjustment command and start the manual intervention alarm.

7. The pyrolysis recovery system of waste wind power blades for co-processing in a power plant boiler according to claim 5, characterized in that, The controller receives the power plant boiler load signal and the rate of change of the temperature detected by the thermocouple in the pyrolysis furnace in real time. When the boiler load change rate exceeds 5% / min for 2 consecutive minutes, it is judged to be a load drop or a load surge, and the following operations are performed: When the load drops, reduce the chain grate speed to 70% of the original speed, prolong the residence time of the material in the pyrolysis furnace; When the load rises, increase the chain grate speed to 130% of the original speed, shorten the residence time of the material in the pyrolysis furnace; Synchronize the calculation of the pyrolysis intensity factor for 5 minutes, maintain the current flue gas adjustment damper and nitrogen valve opening unchanged; When the main thermocouple temperature change rate returns to within ±5℃ / min, reactivate the pyrolysis intensity factor calculation and remove the speed freeze.

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