A combined energy supply decommissioned wind turbine blade pyrolysis recycling system

Abstract

The utility model discloses a kind of pyrolysis recycling systems of decommissioned fan blade of combined energy supply, including decommissioned fan blade pyrolysis system, pyrolysis oil gas combustion system and waste heat recovery system;The decommissioned fan blade pyrolysis system includes feed bin, press bin, pyrolysis chamber, oxidation chamber, alkali fusion chamber, cooling chamber and extraction tank, the pyrolysis oil gas combustion system includes combustion chamber, main burner, auxiliary burner and controller, the pyrolysis chamber, oxidation chamber, alkali fusion chamber, main burner and auxiliary burner are all arranged in combustion chamber, the pyrolysis chamber is connected with main burner, auxiliary burner respectively by pyrolysis oil gas exhaust pipe;The combustion chamber is provided with temperature detection element, and the main burner is provided with gas supply device, and the temperature detection element, main burner, auxiliary burner, gas supply device are electrically connected with controller. Pyrolysis recycling system of the application can match energy supply mode based on temperature feedback, so that energy supply temperature can be accurately controlled.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine blade recycling technology, specifically relating to a combined power supply pyrolysis recycling system for decommissioned wind turbine blades. Background Technology

[0002] The main component of retired wind turbine blades is glass fiber reinforced resin. Traditional recycling methods often involve a "pyrolysis-glass fiber extraction" process: first, the resin and glass fiber are separated using pyrolysis equipment, then the glass fiber is decarburized and cooled for recovery. The entire recycling system typically uses pyrolysis oil for self-powered operation, supplemented by heat exchangers to recover waste heat. For example, patent CN117983641A discloses a continuous self-powered pyrolysis recycling system for retired wind turbine blades. During operation, retired wind turbine blades are fed into a pressure chamber from the feed hopper. Preheating is completed in an oxygen-free environment within the pressure chamber. The preheated blades then enter the pyrolysis chamber, where oxygen-free pyrolysis produces pyrolysis oil and carbon-containing glass fibers. The carbon fibers produced during pyrolysis enter the gasification chamber, where they are decarburized under the action of a gasifying agent to form clean glass fibers. The clean glass fibers then enter the cooling chamber, where they are rapidly cooled in an oxygen-free environment before entering the discharge hopper as recyclable glass fibers. The pyrolysis oil and gas produced during pyrolysis enter the main burner and are burned to generate high-temperature flue gas, providing heat for the pyrolysis process in the pyrolysis chamber and the gasification process in the gasification chamber. The arrangement of the heat exchangers in the cooling chamber provides a rapid cooling environment for the glass fiber, enabling the recovery of low-grade energy. The flue gas heat exchanger lowers the exhaust gas temperature, reduces exhaust losses, and further recovers energy.

[0003] The above-mentioned recovery system has the following problems: relying solely on the main burner to burn pyrolysis oil and gas to power the pyrolysis and gasification processes is a single burner power supply mode, which easily leads to large fluctuations in the power supply temperature, affecting the pyrolysis effect and the gasification decarbonization effect. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a combined power supply system for the pyrolysis recovery of decommissioned wind turbine blades, so as to select the power supply mode based on temperature feedback and to accurately control the power supply temperature.

[0005] This utility model solves the above problems through the following technical means:

[0006] A combined power supply system for the pyrolysis recovery of decommissioned wind turbine blades includes a decommissioned wind turbine blade pyrolysis system, a pyrolysis oil and gas combustion system, and a waste heat recovery system. The decommissioned wind turbine blade pyrolysis system comprises a feed hopper, a pressure chamber, a pyrolysis chamber, an oxidation chamber, an alkali fusion chamber, a cooling chamber, and an extraction tank connected in sequence. The pyrolysis oil and gas combustion system includes a combustion chamber, a main burner, an auxiliary burner, and a controller. The pyrolysis chamber, oxidation chamber, alkali fusion chamber, main burner, and auxiliary burner are all located within the combustion chamber. The pyrolysis chamber is equipped with a pyrolysis oil and gas discharge pipe, which is connected to both the main burner and the auxiliary burner. The combustion chamber is equipped with a temperature detection element, and the main burner is equipped with a gas supply device. The temperature detection element, main burner, auxiliary burner, and gas supply device are all electrically connected to the controller.

[0007] Furthermore, the waste heat recovery system includes a cooling chamber heat exchanger and a flue gas heat exchanger, with the cooling chamber heat exchanger and the cooling chamber exchanging heat through a circulating water heat exchange pipeline; a jacketed preheating chamber is provided on the outside of the pressure chamber, and the combustion chamber is connected to the jacketed preheating chamber through a high-temperature flue gas pipeline, and the jacketed preheating chamber is connected to the flue gas inlet of the flue gas heat exchanger through a high-temperature flue gas circuit.

[0008] Furthermore, the cooling chamber heat exchanger is provided with an air inlet and an air outlet, and the air outlet is connected to the oxidation chamber through a preheated air pipeline.

[0009] Furthermore, it also includes molecular sieve synthesis systems.

[0010] Furthermore, the molecular sieve synthesis system includes a mixing device, a hydrothermal reaction device, and a drying and calcining device connected in sequence, with the mixing device connected to the extraction tank.

[0011] Furthermore, the mixing device, hydrothermal reaction device, and drying and calcining device all exchange heat with the flue gas heat exchanger through a heat transfer oil circulation pipeline.

[0012] The core structure and power supply logic of this utility model application are further explained below:

[0013] Pretreatment-pyrolysis unit structure: The feed hopper feeds material to the pressure chamber at a controlled speed through a star-shaped discharge valve. The jacketed preheating chamber outside the pressure chamber uses the flue gas from the combustion chamber to preheat the material. The inner wall of the pyrolysis chamber is lined with refractory bricks to withstand high temperatures. The pyrolysis oil and gas discharge pipe discharges the pyrolysis oil and gas to provide fuel for the main burner and auxiliary burner. The temperature detection element collects the temperature signal of the combustion chamber in real time and transmits it to the controller.

[0014] Oxidation-alkali fusion unit structure: The oxidation chamber and the pyrolysis chamber are directly welded to ensure that the carbon-containing glass fiber enters the decarburization process quickly; the alkali fusion chamber is resistant to high temperature and is directly connected to the flange of the oxidation chamber without intermediate cooling structure, so that the residual heat of the hot material can be used to assist the alkali fusion reaction. The alkali fusion chamber is supplemented with heat by the combustion chamber, and the internal stirring components ensure that the reaction is complete.

[0015] Combustion power supply unit structure and power supply logic:

[0016] Structural basis: The combustion chamber centrally encloses the pyrolysis chamber, oxidation chamber, and alkali melting chamber, forming an "integrated heating space"; the fuel inlets of the main burner and auxiliary burner are both connected to the pyrolysis oil and gas discharge pipe, and the gas supply device can supplement the main burner with gas as needed;

[0017] Priority power supply logic: The controller receives the temperature signal from the pyrolysis chamber and controls it according to the following logic:

[0018] ① Prioritize the use of pyrolysis oil and gas: When the temperature of the pyrolysis chamber is ≥500℃ (the reference temperature required for pyrolysis), only the main burner works to completely burn the pyrolysis oil and gas, maximizing the use of the raw material's own energy;

[0019] ② Auxiliary heating: When 500℃ > temperature ≥ 480℃ (insufficient pyrolysis oil and gas volume leading to temperature drop), the main burner remains operational, and the auxiliary burner starts (to supplement combustion of pyrolysis oil and gas) to maintain stable temperature;

[0020] ③ Emergency power replenishment: When the temperature is <480℃ (severe shortage of pyrolysis oil and gas, such as a sudden reduction in feed), the main burner and auxiliary burner continue to work, the gas supply device is turned on to replenish the main burner with gas (mixed and burned with pyrolysis oil and gas), and the temperature is quickly restored;

[0021] ④ Logic closed loop: When the temperature rises to ≥500℃, the gas supply device is shut off first. After the temperature remains stable for 10-15 minutes, the auxiliary burner is shut off, returning to the working state of only the main burner burning.

[0022] Cooling-Extraction Unit Structure: The cooling chamber adopts a tubular structure to accommodate high-temperature alkali-melting materials. The cooling chamber heat exchanger integrates water circulation heat exchange and air preheating functions. One end provides closed-loop cooling water to the cooling chamber, while the other end transfers the waste heat of the cooling water to the air required by the oxidation chamber. The extraction tank is alkali-resistant and achieves constant-ratio water spraying and timely slag discharge through the coordinated operation of a solid quantity sensor, controller, automatic water spraying device / electric slag discharge valve.

[0023] The molecular sieve synthesis and waste heat recovery unit is structured as follows: a mixing device, a hydrothermal reaction device, and a drying and calcining device are connected in sequence. Waste heat is obtained from the flue gas heat exchanger through a heat transfer oil circulation pipeline, forming a waste heat utilization chain of "flue gas - heat transfer oil - molecular sieve synthesis".

[0024] The beneficial effects of this utility model are:

[0025] This application uses a combined combustion system consisting of a main burner and an auxiliary burner, which can select the energy supply mode based on temperature feedback, so that the energy supply temperature can be precisely controlled, the utilization rate of pyrolysis oil and gas can be improved, and the natural gas consumption can be reduced.

[0026] Continuous construction: direct module connection + automatic power supply + automatic water control and slag discharge, realizing a whole process of "blade feeding - molecular sieve discharge" without human intervention, thus improving production efficiency;

[0027] Simplified structure: The combustion chamber is centrally heated, the cooling chamber heat exchanger integrates multiple functions, and the power supply logic is realized by relying on the existing controller and temperature detection elements, which reduces the footprint of independent equipment and control modules;

[0028] Resource maximization: Precise pyrolysis and extraction conditions improve silicon and aluminum extraction efficiency, increase molecular sieve yield, and significantly enhance resource value compared to traditional recycling methods. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of a preferred embodiment of the present invention;

[0031] 1-Feeding hopper; 2-Pressure chamber; 3-Pyrolysis chamber; 4-Oxidation chamber; 5-Alkali melting chamber; 6-Combustion chamber; 7-Main burner; 8-Auxiliary burner; 9-Gas supply device; 10-Cooling chamber; 11-Cooling chamber heat exchanger; 12-Extraction tank; 13-Mixing device; 14-Hydrolysis reaction device; 15-Drying combustion device; 16-Flue gas heat exchanger; 17-Heat transfer oil circulation pipeline. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1 As shown: This utility model's combined power supply system for decommissioned wind turbine blade pyrolysis recovery includes a decommissioned wind turbine blade pyrolysis system, a pyrolysis oil and gas combustion system, and a waste heat recovery system. The decommissioned wind turbine blade pyrolysis system includes a feed hopper, a pressure chamber, a pyrolysis chamber, an oxidation chamber, an alkali melting chamber, a cooling chamber, and an extraction tank connected in sequence. The pyrolysis oil and gas combustion system includes a combustion chamber, a main burner, an auxiliary burner, and a controller. The pyrolysis chamber, oxidation chamber, alkali melting chamber, main burner, and auxiliary burner are all located in the combustion chamber. The pyrolysis chamber is equipped with a pyrolysis oil and gas discharge pipe, which is connected to the main burner and the auxiliary burner, respectively. The combustion chamber is equipped with a temperature detection element, and the main burner is equipped with a gas supply device. The temperature detection element, the main burner, the auxiliary burner, and the gas supply device are all electrically connected to the controller.

[0033] The waste heat recovery system includes a cooling chamber heat exchanger and a flue gas heat exchanger. The cooling chamber heat exchanger and the cooling chamber exchange chamber exchange heat through a circulating water heat exchange pipeline. A jacketed preheating chamber is provided on the outside of the pressure chamber. The combustion chamber is connected to the jacketed preheating chamber through a high-temperature flue gas pipeline. The jacketed preheating chamber is connected to the flue gas inlet of the flue gas heat exchanger through a high-temperature flue gas circuit. The waste heat generated by the system can be recovered and utilized through this waste heat recovery system.

[0034] The cooling chamber heat exchanger is equipped with an air inlet and an air outlet, and the air outlet is connected to the oxidation chamber via a preheated air pipeline. The waste heat of the cooling water is transferred to the air to be introduced into the oxidation chamber, thus preheating the air.

[0035] It also includes a molecular sieve synthesis system; the molecular sieve synthesis system includes a mixing device, a hydrothermal reaction device and a drying and calcining device connected in sequence, the mixing device being connected to an extraction tank; the mixing device, the hydrothermal reaction device and the drying and calcining device all exchange heat with the flue gas heat exchanger through a heat transfer oil circulation pipeline.

[0036] The system operation process is as follows:

[0037] Raw material pretreatment and pyrolysis stage

[0038] After being crushed, the retired wind turbine blades are fed into the feed hopper. The star-shaped discharge valve at the bottom of the feed hopper delivers raw materials to the pressure hopper at a controlled speed through a carbon steel pipeline. When the combustion chamber is initially started, the gas supply device first introduces gas, and the main burner works to heat the combustion chamber. The generated flue gas at 800-900℃ enters the jacketed preheating chamber of the pressure hopper through the high-temperature flue gas pipeline, preheating the material to 150-200℃. The flue gas is then connected to the flue gas heat exchanger.

[0039] Preheated material enters the pyrolysis chamber. As the material pyrolyzes and produces oil and gas, the temperature detection element transmits the temperature signal from the combustion chamber to the controller in real time.

[0040] When the temperature rises to ≥500℃, the controller shuts off the gas supply device, and only the main burner burns the pyrolysis oil and gas to maintain the pyrolysis reaction.

[0041] If the feed rate decreases, resulting in insufficient pyrolysis oil and gas, and the temperature drops to the 480-500℃ range, the controller will immediately start the auxiliary burner to burn the oil and gas together with the main burner to prevent the temperature from dropping further.

[0042] If the temperature drops further to <480℃, the controller turns on the gas supply device to supplement the main burner with gas. The gas mixes and burns with the pyrolysis oil and gas, and the temperature rises rapidly. When the temperature rises back to ≥500℃ and stabilizes for 12 minutes, the controller first turns off the gas supply device and then turns off the auxiliary burner.

[0043] The carbon-containing glass fibers produced by pyrolysis are directly introduced into the oxidation chamber, and the pyrolysis oil and gas are continuously burned to provide energy.

[0044] Oxidation and high-temperature alkali fusion stage

[0045] The cooling chamber heat exchanger is started, transferring the waste heat of the cooling water to the air to be introduced into the oxidation chamber, preheating the air to 120-150℃, and then evenly introducing it through the gas distributor installed in the oxidation chamber; the preheated air and carbon-containing glass fiber undergo a decarburization reaction in the oxidation chamber (the oxidation chamber is surrounded by the combustion chamber, and the decarburization temperature of 650-750℃ is maintained by the high temperature of the combustion chamber).

[0046] The decarburized hot material enters the alkali melting chamber directly through a flange direct connection structure (without intermediate cooling), where it mixes with the added NaOH. The alkali melting chamber maintains a reaction temperature of 600-800℃ through the high-temperature zone of the combustion chamber, and the internal paddle agitator continuously stirs the material to ensure that the material reacts fully to form a silicate-aluminate mixture. The residual heat of the hot material helps reduce the energy load on the combustion chamber.

[0047] Cooling and silicon-aluminum extraction stage

[0048] The aluminosilicate mixture enters the cooling chamber through a high-temperature insulated pipe. The cooling chamber heat exchanger exchanges heat with the cooling chamber through a circulating water heat exchange pipe, cooling the mixture to 80-120℃. The deposited impurities generated during the cooling process are cleaned every 24 hours through the manual butterfly valve cleaning port at the bottom of the cooling chamber.

[0049] After cooling, the mixture enters the extraction tank, and the solids volume sensor transmits the volume signal of the material flowing into the extraction tank to the controller.

[0050] The controller controls the opening of the solenoid valve of the automatic water spraying device according to a solid-liquid ratio of 1:3, and introduces cooling water from the water supply pipeline of the cooling chamber heat exchanger for precise spraying.

[0051] When the slag accumulates and the solids quantity sensor reading exceeds the set threshold, the controller automatically opens the electric slag discharge valve to discharge the slag, and closes the valve after the slag discharge is completed.

[0052] The cold water spray pipes of the extraction tank are activated as needed for emergency cooling, ultimately completing the extraction of silicon-aluminum source; the cooling water in the cooling chamber is returned to the cooling chamber heat exchanger, forming a cycle.

[0053] The aforementioned solid quantity sensor, automatic water spray device, cold water spray pipe, etc. are all supporting components of the extraction tank. Their specific installation methods and implementation methods are existing technologies and will not be described in detail here.

[0054] Molecular sieve synthesis and waste heat recovery stage

[0055] The silicon-aluminum source enters the mixing device and mixes with the template agent at 50-80℃ (the mixing device is connected to the heat transfer oil circulation pipeline through a jacketed structure, and the temperature is controlled at 190-210℃); the mixture enters the hydrothermal reaction device and completes the hydrothermal reaction at 0.3-0.5MPa and 120-180℃; the reaction product enters the drying and calcining device, and the temperature is controlled in stages by the heat transfer oil (drying section 100-120℃, calcining section 550-600℃) to obtain the finished molecular sieve; it should be noted that: in order to ensure the temperature of the combustion section, the drying and combustion device is equipped with its own burner.

[0056] During the waste heat recovery process, the flue gas in the combustion chamber is preheated by the pressure chamber and then enters the flue gas heat exchanger, which heats the heat transfer oil from 30-50℃ to 190-210℃, and the final exhaust temperature is ≤180℃. The heat transfer oil circulation pipeline is equipped with an expansion tank to balance the system pressure and ensure stable energy supply.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A combined energy supply decommissioned wind turbine blade pyrolysis recycling system, comprising a decommissioned wind turbine blade pyrolysis system, a pyrolysis oil gas combustion system and a waste heat recovery system; characterized in that: The decommissioned wind turbine blade pyrolysis system includes a feed hopper, a pressure chamber, a pyrolysis chamber, an oxidation chamber, an alkali melting chamber, a cooling chamber, and an extraction tank connected in sequence. The pyrolysis oil and gas combustion system includes a combustion chamber, a main burner, an auxiliary burner, and a controller. The pyrolysis chamber, oxidation chamber, alkali melting chamber, main burner, and auxiliary burner are all located in the combustion chamber. The pyrolysis chamber is equipped with a pyrolysis oil and gas discharge pipe, which is connected to the main burner and the auxiliary burner, respectively. The combustion chamber is equipped with a temperature detection element, and the main burner is equipped with a gas supply device. The temperature detection element, the main burner, the auxiliary burner, and the gas supply device are all electrically connected to the controller.

2. The combined power supply system for decommissioned wind turbine blade pyrolysis recovery according to claim 1, characterized in that: The waste heat recovery system includes a cooling chamber heat exchanger and a flue gas heat exchanger. The cooling chamber heat exchanger and the cooling chamber exchange heat through a circulating water heat exchange pipeline. A jacketed preheating chamber is provided on the outside of the pressure chamber. The combustion chamber is connected to the jacketed preheating chamber through a high-temperature flue gas pipeline. The jacketed preheating chamber is connected to the flue gas inlet of the flue gas heat exchanger through a high-temperature flue gas circuit.

3. The combined power supply system for decommissioned wind turbine blade pyrolysis recovery according to claim 2, characterized in that: The cooling chamber heat exchanger is provided with an air inlet and an air outlet, and the air outlet is connected to the oxidation chamber through a preheated air pipeline.

4. The decommissioned wind turbine blade pyrolysis recovery system with combined power supply according to any one of claims 1-3, characterized in that: It also includes molecular sieve synthesis systems.

5. The combined power supply system for decommissioned wind turbine blade pyrolysis recovery according to claim 4, characterized in that: The molecular sieve synthesis system includes a mixing device, a hydrothermal reaction device, and a drying and calcining device connected in sequence, with the mixing device connected to an extraction tank.

6. The combined power supply system for decommissioned wind turbine blade pyrolysis recovery according to claim 5, characterized in that: The mixing device, hydrothermal reaction device, and drying and calcining device all exchange heat with the flue gas heat exchanger through a heat transfer oil circulation pipeline.

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