Manufacturing method of high-performance asphalt concrete doped with retired fan blade

Abstract

The invention discloses a manufacturing method of high-performance asphalt concrete doped with retired fan blades. The manufacturing method comprises the following steps: S1, heating and supplying air through a solar frequency division device; s2, heating the asphalt by using a vortex ring air supply drying oven; s3, waste heat of the drying oven is recycled through the phase-change material; s4, an aggregate preheating system is adopted for mixing the retired fan blade, and the aggregate and the filler are heated through a flat pipe type heat pipe; and S5, adding asphalt in a sectional manner, optimizing the structure of the stirring tank, and strengthening disturbance. The device has the beneficial effects that a solution is provided for recycling of retired fan blades, the utilization efficiency of solar energy and the heating effect of the drying oven are improved, the flat pipe type heat pipes can improve the heat exchange efficiency, the temperature rising speed of aggregate is increased, the asphalt heating process and the tail gas treatment process adapt to the energy-saving and emission-reducing policy, and the energy-saving and emission-reducing effects are achieved. The asphalt is added in a sectional manner, and the structure in the stirring tank is improved, so that the asphalt is fully contacted with aggregate during stirring, and the mechanical property of the asphalt concrete is finally improved.

Description

Technical Field

[0001] The invention relates to the field of asphalt concrete, and in particular to a method for preparing high-performance asphalt concrete doped with retired wind turbine blades. Background Art

[0002] With the advancement of renewable energy development, wind power generation has become one of the clean energy sources widely used around the world. However, the recycling of retired wind turbine blades has always been a challenge faced by this field. In addition, traditional asphalt roads also have disadvantages such as temperature sensitivity, poor durability, and flammability. Therefore, whether an asphalt road with good mechanical properties and long service life can be designed has gradually become a research hotspot. During the production process of asphalt concrete, there may be uneven heating, poor fit between asphalt and aggregate, insufficient adhesion, and cracking, which also need to be solved urgently.

[0003] In the process of making asphalt concrete, (1) the adhesion of traditional asphalt (modified asphalt) is limited, the production cost is too high, and some mechanical properties and durability are lacking; (2) when the oven heats the asphalt, the heating speed is slow, the heating is uneven, the heating effect is poor, and the asphalt ages; (3) the waste heat from the exhaust gas heated by the oven cannot be utilized, and toxic gases are emitted when the asphalt is heated, polluting the environment; (4) the aggregate is heated unevenly during preheating, and the traditional heat exchanger takes a long time to heat, and the heat utilization efficiency is low; (5) the asphalt is unevenly mixed with the aggregate. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for producing high-performance asphalt concrete doped with retired wind turbine blades.

[0005] The specific plan is as follows:

[0006] A method for preparing high-performance asphalt concrete doped with retired wind turbine blades, characterized in that it comprises the following steps:

[0007] S1, heating and air supply through solar frequency division device;

[0008] S2, heating the asphalt using an oven with built-in vortex ring air supply;

[0009] S3, phase change material recovery oven waste heat;

[0010] S4. Use the aggregate preheating system to mix the retired fan blades, and heat the aggregate and filler through the flat tube heat pipe;

[0011] S5. Add asphalt in stages, optimize the mixing tank structure, and strengthen disturbance;

[0012] Among them, the solar frequency division device is laid on the outer surface of the oven, and the exhaust port on the top of the oven is connected to the waste heat recovery device. The waste heat recovery device heats the asphalt modification reagent tank and the modifier in its inner cavity. After heating, the modifier is mixed with the melted asphalt to form modified asphalt; before the modified asphalt is added to the mixing tank, the aggregate and filler are first heated by a flat tube heat pipe, and the aggregate is first fed into the mixing tank, and then the filler and the modified asphalt are fed into the filler together. The modified asphalt is fed into the mixing tank in sections, and finally the modified asphalt, filler and aggregate are mixed together in the mixing tank to generate asphalt concrete.

[0013] Furthermore, the solar energy frequency division absorption device includes a concentrating solar cell, a phase change material, a frequency division fluid, a transparent plate, and a concentrator. The concentrator collects sunlight on the outside, a layer of transparent plate is laid outside the frequency division fluid, and a layer of phase change material is laid inside. The phase change material is coated on the outside of the oven. The frequency division fluid absorbs the heat energy generated by the solar energy and the heat energy generated by the concentrating solar cell to heat the oven. The sunlight concentrated by the concentrator is projected onto the concentrating solar cell to generate electrical energy and thermal energy. Among them, the frequency division fluid is a propylene glycol solution of CoSO4. The frequency division fluid first absorbs solar energy, then absorbs the heat emitted by the concentrating solar cell, and finally sends it to the left and right heat exchange coils of the oven.

[0014] Furthermore, the concentrated solar cell is used to supply power to the electrical control box of the oven.

[0015] Furthermore, the oven includes an electric heater, a heat exchange coil, a fan motor, an electrical control box, a vortex ring device, and a bent pipe. The inner wall of the oven is a hollow structure. The fan motor is at the top of the outer side of the oven and is connected to the worm gear at the top of the cavity of the inner wall of the oven. A filter layer for filtering is provided on the outer side of the worm gear. Two heat exchange coils are arranged on the left and right sides of the oven, and the bottom is used to store asphalt to be heated. Two electric heaters are arranged on the left and right sides of the cavity of the inner wall of the oven, and the liquid in the heat exchange coil is a divided frequency fluid. A vortex ring device is arranged in the middle of the left and right heat exchange coils. The vortex ring device is embedded in the inlet of the bent pipe and is flush with the cross-section of the inlet of the bent pipe. The bent pipe is fixed in the transverse wind cavity, and the left and right sides of the transverse wind cavity are air inlets. When the concentrating solar cell is working, the left and right electric heaters generate heat energy to heat the air to the required temperature. The required temperature is then sent into the vortex ring device through the left and right air inlets; when the solar frequency division device is working, the frequency division fluid heats the air through the left and right heat exchange plates, and then sends the air into the vortex ring device through the left and right air inlets; since the vortex ring device is embedded in the elbow, the wind sent by the vortex ring flows into the elbow at a 90° angle along the tangent direction of the elbow inlet, and the shape of the elbow is a half-moon; when the asphalt is heated, vibration must be maintained, and the asphalt surface is dehydrated in the early stage. The generated water vapor returns to the top through the action of the fan motor and is discharged from the exhaust port. After the drying is completed, the oven enters the second stage, and the air volume of the vortex ring air supply is adjusted again to supply air to the asphalt in all directions until the asphalt is completely melted. Inside the oven, moisture and exhaust gas will be discharged through the exhaust port, and the heated asphalt is sent to the asphalt tank for storage.

[0016] Furthermore, the aggregate preheating system includes a crushing and screening machine, a first heat pipe heat exchanger, a second heat pipe heat exchanger, and a screener; the crushing and screening machine is connected to the GFRP filler tank and the GFRP aggregate tank, and then respectively sent to the first metering machine and the third metering machine, the first heat pipe heat exchanger is connected to the first metering machine, the filler is heated in the first heat pipe heat exchanger, and the particle size of the filler is less than 0.075mm, the second heat pipe heat exchanger is connected to the third metering machine, the aggregate is heated in the second heat pipe heat exchanger, and the particle size is greater than 0.075mm, and the heated aggregate and filler are sent to the mixing tank, wherein the heat pipe heat exchanger is made of flat tubes, the thickness of the flat tubes is selected to be 1.2mm and the width is 15mm; the retired fan blades are made of glass fiber reinforced plastic GFRP; after the GFRP passes through the crusher and screening machine , producing fragments of various particle sizes, among which those with a diameter less than 0.075mm are sent to the GFRP filler tank for storage, and those with a diameter greater than 0.075mm are sent to the GFRP aggregate tank. According to the ratio requirements of different roads, different proportions of various materials are selected, and the GFRP filler and ordinary mineral material are sent to the first metering device for weighing, and then sent to the first heat pipe heat exchanger after weighing. After the aggregate tank is screened by the screening machine, those with a diameter less than 0.075mm are sent to the mineral tank, and those greater than 0.075mm are sent to the third metering device. At the same time, the GFRP aggregate tank is also screened by the screener and sent to the third metering device. After being mixed in a certain proportion, it is sent to the second heat pipe heat exchanger; the flat tube heat exchanger adopts a countercurrent arrangement, and the thickness of the flat tube is selected to be 1.2mm and the width is 15mm.

[0017] Furthermore, asphalt is added in stages. Stage I uses a pressure pump to directly deliver 80% of the total asphalt into the mixing tank, and stage II uses a siphon device to deliver 20% of the total asphalt into the mixing tank. Stage I uses a one-time addition, and stage II can adjust the opening of the valve of the siphon system to control the flow rate of the asphalt, adding and stirring at the same time.

[0018] Furthermore, the mixing tank is connected to an asphalt modifier tank; the asphalt modifier tank contains three modifiers, and the specific mixing ratio with asphalt is 1% SBR and 3% SBS, and 2% silane coupling agent, which enhances the mechanical properties of asphalt concrete; the GFRP aggregate is finally sent into the mixing tank together with the asphalt for mixing, and the asphalt and the modifier are mixed before mixing. During the mixing process, the aggregate is added first, and then the filler and modified asphalt are added.

[0019] Furthermore, the exhaust port waste heat recovery device includes an ultra-thin water belt for heat exchange, a paraffin layer, and an exhaust pipe. The outside of the exhaust pipe is coated with a paraffin layer, and the outside of the paraffin side is a layer of ultra-thin hot water belt. The water in the water belt exchanges heat with the modifier tank through the heat exchange coil, and the paraffin is used to store the heat of the exhaust port and the heat output to the water belt; wherein, the paraffin absorbs the waste heat of the exhaust pipe and melts to store the heat. After the exhaust gas is discharged, the first valve and the second valve are opened, and the ultra-thin water belt for heat exchange around the paraffin absorbs the heat of the paraffin, and the paraffin becomes solid again after heat dissipation for the next heat storage; the water that absorbs the heat of the paraffin passes through the second valve, enters the coil and undergoes convection heat exchange with the asphalt asphalt modification reagent tank to preheat the asphalt modifier; the water in the ultra-thin water belt for heat exchange becomes cold water after heat exchange, and flows back to the ultra-thin water belt for heat exchange in the exhaust pipe through the second valve for heat exchange.

[0020] Furthermore, a gas filtering device is installed above the exhaust pipe. The filtering device adopts an activated carbon automatic replacement device, which is composed of an adsorption plate, a baffle, a rotating shaft, an activated carbon waste discharge port, and a waiting plate. The rotating shaft connects the adsorption plate and the waiting plate. There is a baffle with adjustable opening in each hole in the adsorption plate. Activated carbon is placed above the baffle. The adsorption plate stays in the filter and is replaced regularly. The adsorption plate is responsible for adsorbing the toxic gas generated by the exhaust port. According to the set adsorption time, the opening of the baffle is adjusted and the gas is regularly discharged into the activated carbon waste discharge port. After the adsorption of one adsorption plate is completed, it is returned to the vacant position of the waiting plate through the rotation and lifting action of the rotating shaft and activated carbon is added. At the same time, the waiting plate rises to the position of the adsorption plate through the rotating shaft to start adsorbing the toxic gas.

[0021] Furthermore, a fine screen is placed in the lower part of the mixing tank to screen out some fine aggregates and fillers that are not well mixed with the asphalt at the bottom and send them to the collecting tank. They return to the top of the mixing tank along the conveying pipe to participate in the mixing of asphalt concrete. The fine screen and the collecting tank baffle are taken out at the extraction port for cleaning and replacement, and the well-mixed asphalt concrete flows out from the bottom.

[0022] The beneficial effects of the present invention are:

[0023] It provides a solution for the recycling of retired wind turbine blades. The use of solar frequency division device not only enhances the utilization efficiency of solar energy, but also significantly improves the heating effect of asphalt inside the oven, improves the working conditions of electric heaters, and further increases the service life of the oven. The waste heat recovery device improves the utilization rate of energy on the one hand, and prevents the escape of toxic gases on the other hand. It is in line with the energy conservation and emission reduction policy. The segmented addition of asphalt, the bounce of asphalt in the mixing tank, and the fine screening of aggregates before transportation improve the uneven mixing between asphalt and aggregates during concrete mixing, the inaccurate amount of asphalt, and other problems. The flat tube heat pipe can improve the heat exchange efficiency, and the aggregate temperature rises quickly. The system as a whole reduces the energy consumption, realizes the recycling of resources, and improves the pollution problem of exhaust gas. The incorporation of fan blades can improve the durability and compressive resistance of asphalt concrete, extend the service life of the highway, and bring continuous social and economic benefits to the people. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a system diagram.

[0025] Figure 2 This is an enlarged view of the heating structure of the solar frequency division device.

[0026] Figure 3 This is an enlarged view of the exhaust gas waste heat recovery device.

[0027] Figure 4 This is a diagram of the siphon system.

[0028] Figure 5 Schematic diagram of the arrangement of springs in the mixing tank.

[0029] Figure 6 This is the path diagram of asphalt droplets in the mixing tank.

[0030] Figure 7 This is the structural diagram of the flat tube heat exchanger.

[0031] Figure 8 This is the front view of the vortex ring embedded in the curved pipe.

[0032] Fig. 9 This is a top view of the vortex ring embedded in the curved pipe.

[0033] Fig.10 This is the wind speed at the elbow inlet entering the boundary layer along the tangent line.

[0034] Fig.11 This is the mixing diagram of GFRP materials inside asphalt concrete.

[0035] Fig.12 This is a diagram of the concave and convex micro deformation inside the bent pipe.

[0036] Fig.13 It is an automatic replacement device for activated carbon.

[0037] Fig.14 Diagram of the fine screen device used in the mixing tank.

[0038] List of reference numerals:

[0039] 1. Crushing and screening machine, 2. GFRP filling tank, 3. Mineral tank, 4. Asphalt tank, 5. First meter, 6. Second meter, 7. First heat pipe heat exchanger, 8. Oven, 9. Fan motor, 10. Worm gear, 11. Electrical control box, 12. Right electric heater, 13. First insulation layer, 14. Vortex ring device, 15. Bend pipe, 16. Right heat exchange coil, 17. Left heat exchange coil, 18. Left electric heater, 19. Exhaust port, 20. Water hose, 21 , filter, 22, activated carbon automatic replacement device, 23, concentrating solar cell, 24, silicone plastic sealant, 25, ceramic substrate, 26, modified asphalt, 27, coarse aggregate, 28, filler, 29, phase change material, 30, fine aggregate, 31, frequency division fluid, 32, transparent plate, 33, concentrator, 34, pressure pump, 35, second insulation layer, 36, small asphalt tank, 37, first control valve, 38, funnel, 39, self-recording clock, 40, automatic pen, 41, float , 42, liquid level detector, 43, float chamber, 44, second control valve, 45, siphon, 46, asphalt modification reagent tank, 47, first valve, 48, second valve, 49, heat exchange coil, 50, crushing screen, 51, GFRP filler tank, 52, GFRP aggregate tank, 53, third meter, 54, second heat pipe heat exchanger, 55, mixing tank, 56, shrapnel group, 57, paraffin layer, 58, exhaust pipe, 59, filter layer, 60, hot fluid inlet Mouth, 61, aggregate outlet, 62, aggregate inlet, 63, flat tube, 64, baffle, 65, hot fluid outlet, 66, concave-convex micro-deformation, 67, fine screen, 68, collecting trough, 69, conveying pipe, 70, fixer, 71, extraction outlet, 72, collecting trough baffle, 73, adsorption plate, 74, shield, 75, rotating shaft, 76, activated carbon waste outlet, 77, waiting plate, 78, sieve hole, 79, asphalt droplets, 80, velocity boundary layer, 81, separation zone. DETAILED DESCRIPTION

[0040] The present invention is now described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0041] As shown in the figure, the present invention provides a method for preparing high-performance asphalt concrete doped with retired wind turbine blades, comprising the following steps:

[0042] S1, heating and air supply through solar frequency division device;

[0043] S2, heating asphalt in an oven with vortex ring air supply;

[0044] S3, using the aggregate preheating system to mix the retired fan blades, heating the aggregate and filler through the flat tube heat pipe;

[0045] S4, phase change material recovery oven waste heat;

[0046] S5. Add asphalt in stages to intensify disturbance.

[0047] In this embodiment, the solar frequency division absorption device is mainly composed of a concentrating solar cell 23, a phase change material 29, a frequency division fluid 31, a transparent plate 32, and a concentrator 33. The frequency division fluid 31 is a propylene glycol solution of CoSO4. The near-infrared radiation with a wavelength of 325-670nm can be better absorbed by the frequency division fluid 31. The frequency division fluid 31 first absorbs solar energy, then absorbs the heat emitted by the concentrating solar cell 23, and finally feeds it into the left and right heat exchange coils of the oven 8 to heat the air fed in by the left and right air outlets. The concentrating solar cell 23 can supply power to the electrical control box 11. (1) If there is sufficient light, only the heat of the frequency division fluid is used to heat the air in the oven 8. At the same time, the concentrating solar cell 23 stores electrical energy, and the phase change material 29 paraffin stores thermal energy. The phase change material 29 is used to heat the air on the one hand and to heat the water in the exhaust waste heat recovery device on the other hand. (2) If there is insufficient light, the electric energy stored in the concentrating solar cell 23 is used to power the left and right heaters in the oven 8 to assist in heating and air supply. The heat energy previously stored in the phase change material 29 is also released to heat the air inside the oven 8.

[0048] In this embodiment, the air sent in by the fan motor 9 is filtered by the filter layer 59, and then the air is heated by the solar frequency division device and sent to the vortex ring device 14. The vortex ring device 14 is embedded in the elbow 15. The wind sent by the vortex ring flows into the elbow 15 at a 90° angle along the tangent direction of the inlet of the elbow 15. The shape of the elbow 15 is half-moon-shaped. The inner wall of the elbow 15 produces a catapulting effect on the airflow. The wind sent by the vortex ring will produce a small concave and convex deformation on the inner wall of the elbow 15, thereby enhancing heat exchange. The elbow 15 improves the heat exchange efficiency by increasing the disturbance of the hot air in the pipe. When the hot air flows through the elbow 15, due to the centrifugal force, a secondary circulation is generated on the cross section. This disturbance increases the intensity of the heat exchange. On the other hand, the elbow 15 can also reduce the pressure loss of the pipeline. In the pipeline, the fluid will produce a certain pressure loss due to the existence of friction and resistance. The elbow 15 can reduce the pressure loss of the fluid by changing the flow direction and velocity distribution of the air supply. The disturbance of the velocity boundary layer makes the air supply uniform, and the melting speed of the asphalt increases. And the outlet of the bend pipe 15 can achieve the effect of flexible and uniform air supply. When the asphalt is heated, it must be kept vibrating. In the early stage, the asphalt surface is mainly dehydrated, and the generated water vapor returns to the top through the action of the circulating fan motor 9 and is discharged from the exhaust port 19. After the drying is completed, the oven enters the second stage, and the air volume of the vortex ring air supply is adjusted again to supply air to the asphalt in all directions until the asphalt is completely melted. Inside the oven, moisture and exhaust gas will be discharged through the exhaust port 19, and the heated asphalt will be sent to the asphalt tank for storage.

[0049] The inner diameter d of the elbow 15 is 15 cm, the outer diameter D is 25 cm, the wall thickness T is 5 cm, and the bending angle is 180°, then the diameter C is:

[0050]

[0051] The bending length L is

[0052]

[0053] The radius of curvature R of the diameter is

[0054]

[0055] In this embodiment, the aggregate preheating system mainly includes a crushing and screening machine 1, a first heat pipe heat exchanger 7, a second heat pipe heat exchanger 54, and a screener 50. The retired wind turbine blades are mainly composed of glass fiber reinforced plastic (GFRP). GFRP has good crack resistance, high temperature resistance, bending resistance and other properties. GFRP is used to replace part of the coarse and fine aggregates. The incorporation and dispersion of GFRP is conducive to the formation of a three-dimensional network in the asphalt, which limits the destruction of the colloidal structure and is conducive to the cross-linking of the solid network, thereby enhancing the elasticity of the asphalt. At the same time, due to the bridging effect of the fiber, it is conducive to further improving the road performance of the asphalt concrete. After GFRP passes through the crusher and screener 1, fragments of various particle sizes are produced, among which those with a particle size less than 0.075 mm are sent to the GFRP filler tank 2 for storage, and those with a particle size greater than 0.075 mm are sent to the GFRP aggregate tank 52. According to the ratio requirements of different roads, different proportions of various materials are selected, and the GFRP filler and ordinary mineral materials are sent to the first metering device 5 for weighing, and then sent to the first heat pipe heat exchanger 7 after weighing. After the aggregate tank 51 is screened by the screening machine 50, those with a diameter less than 0.075 mm are sent to the mineral tank 3, and those with a diameter greater than 0.075 mm are sent to the third metering device 53. At the same time, the GFRP aggregate tank is also screened by the screener 50 and sent to the third metering device 53, and then sent to the second heat pipe heat exchanger 54 after being mixed in a certain proportion. The asphalt modifier tank 46 contains three modifiers, and the specific mixing ratio with asphalt concrete is 1% SBR and 3% SBS, and 2% silane coupling agent, which can enhance the mechanical properties of asphalt concrete. The proportion of GFRP as aggregate is determined according to experiments and actual needs, and finally sent to the mixing tank 55 together with asphalt for stirring. Before stirring, the asphalt and the modifier are mixed. During the stirring process, the aggregate is first added, and then the filler and modified asphalt are added. The asphalt is added in stages. The pressure pump 34 directly sends 80% of the total amount of asphalt to the mixing tank 55, and the siphon device is used to send 20% of the total amount of asphalt to the mixing tank 55. The I stage is added once, and the II stage can adjust the opening of the valve of the siphon system to control the flow rate of the asphalt. Stirring while adding is conducive to the mixing between the asphalt and the aggregate, and the mechanical properties of the asphalt concrete are better. The flat tube heat exchanger adopts a countercurrent arrangement. The thickness of the flat tube is 1.2 mm and the width is 15 mm. The flat tube 63 has a small volume and a large specific area. Compared with the traditional heat exchanger, the heat exchange area of ​​the heated liquid is increased, which is conducive to better heating and drying of the aggregate.

[0056] In this embodiment, when the asphalt is heated, in order to maintain the normal working state of the oven, the oven exhaust port 19 will discharge high-calorie moisture and harmful volatile gases, etc., and a layer of phase change heat storage material with a melting point of 110°C, namely RT110 paraffin 57, is wrapped on the outer wall of the exhaust pipe 58. The paraffin 57 absorbs the waste heat of the exhaust pipe and melts to store the heat. After the exhaust gas is discharged, the first valve 47 and the second valve 48 are opened, and the ultra-thin heat exchange water belt 20 around the paraffin 57 absorbs the heat of the paraffin 57. After the paraffin 57 dissipates heat, it becomes solid again and performs the next heat storage; the water that absorbs the heat of the paraffin 57 passes through the second valve 48, enters the coil 49 and undergoes convection heat exchange with the asphalt modification reagent tank 46, so as to preheat the asphalt modifier and facilitate better mixing with the asphalt. The water in the ultra-thin heat exchange water belt 20 becomes cold water after heat exchange, and flows back to the ultra-thin heat exchange water belt 20 of the exhaust pipe through the second valve 48 for heat exchange. At the same time, a gas filtering device 21 is installed above the exhaust pipe 58. Asphalt will produce evaporated toxic gas during the melting process. The filtering device adopts an activated carbon automatic replacement device 22, which is mainly composed of an adsorption plate 73, a baffle 74, a rotating shaft 75, an activated carbon waste discharge port 76, and a waiting plate 77. The adsorption plate 73 is mainly responsible for adsorbing the toxic gas generated by the exhaust port 19. According to the set adsorption time, the opening of the baffle 74 is adjusted, and the toxic gas is regularly discharged to the activated carbon waste discharge port 76. After the adsorption of one adsorption plate 73 is completed, it is returned to the vacant position of the waiting plate 77 through the rotation and lifting action of the rotating shaft 75 and activated carbon is added. At the same time, the waiting plate 77 rises to the position of the adsorption plate 73 through the rotating shaft 75 and starts to adsorb the toxic gas. Such a cycle is conducive to the automatic replacement of activated carbon and better adsorption of toxic gas. At the beginning of the operation of the oven 8, the exhaust gas temperature is insufficient, and part of the heat stored in the phase change material 29 in the solar frequency division device can be used to heat the water belt. Such a cycle not only avoids energy waste, but also realizes the reuse of waste heat and avoids the direct discharge of exhaust gas generated by the exhaust pipe, which is beneficial to energy saving and environmental protection.

[0057] In this embodiment, when asphalt is fed into the mixing tank, the asphalt is added in stages. 80% of the total amount of asphalt heated in the oven 8 is directly fed into the mixing tank 55 through the pressure pump 34. At this time, the asphalt will be mixed with most of the aggregates. Since a large amount of asphalt is poured, there is still a small part of the aggregate that cannot be well mixed with the asphalt, and the mixing between the aggregate and the asphalt is uneven. A fine screen 67 with a size of 8 mesh is placed in the lower part of the mixing tank 55 to screen out some fine aggregates and fillers at the bottom and feed them into the collecting tank 68. They return to the top of the mixing tank 55 along the conveying pipe 69 to participate in the mixing of the asphalt concrete. This helps to better mix the asphalt with small-sized materials. When the mixing is completed, the fine screen 67 and the collecting tank baffle 72 are taken out from the extraction port 71 for cleaning and replacement, and the well-mixed asphalt concrete flows out from the bottom. At this time, the remaining 20% ​​of asphalt in the oven 8 is sent to the small asphalt tank 36 through the pressure pump 34, and then flows into the float chamber 43 through the funnel 38. The float chamber 43 is connected to the siphon tube 45. The asphalt in the float chamber 43 is sucked into the mixing tank 55 by the liquid level difference caused by the height difference. By utilizing the siphon effect, the cost generated during the asphalt transportation process can be saved, and the asphalt dosage and the start and stop of the system can be conveniently controlled. The middle part of the top of the mixing tank 55 is installed with a spring group 56 according to the height and position. The float chamber 43 is installed with a float 41. As the float 41 rises and falls, the self-recording clock 39 and the automatic pen 40 on its upper end start to work, recording the change of the liquid level height of the asphalt in the float chamber 43. The first control valve 37 and the second control valve 44 control the asphalt dosage by adjusting the size of the opening. As the asphalt drops into the mixing tank 55, the asphalt will continuously collide with the shrapnel group 56 in the mixing tank 55. The continuous dripping and bouncing between the asphalt and the shrapnel group 56 enhances the disturbance of the asphalt in the container, allowing the asphalt to penetrate into some aggregates with relatively small gaps, which helps to better mix the aggregates and the asphalt, and also helps to accurately control the amount of asphalt used.

Claims

1. A method for producing high-performance asphalt concrete mixed with retired wind turbine blades, characterized in that: The following steps are involved: S1, heating and air supply through solar frequency division device; S2, heating the asphalt using an oven with built-in vortex ring air supply; S3, phase change material recovery oven waste heat; S4. Use the aggregate preheating system to mix the retired fan blades, and heat the aggregate and filler through the flat tube heat pipe; S5. Add asphalt in stages, optimize the mixing tank structure, and strengthen disturbance; Among them, the solar frequency division device is laid on the outer surface of the oven, and the exhaust port on the top of the oven is connected to the waste heat recovery device. The waste heat recovery device heats the asphalt modification reagent tank and the modifier in its inner cavity. After heating, the modifier is mixed with the melted asphalt to form modified asphalt; before the modified asphalt is added to the mixing tank, the aggregate and filler are first heated by a flat tube heat pipe, and the aggregate is first fed into the mixing tank, and then the filler and the modified asphalt are fed into the filler together. The modified asphalt is fed into the mixing tank in sections, and finally the modified asphalt, filler and aggregate are mixed together in the mixing tank to generate asphalt concrete.

2. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 1 is characterized in that: The solar energy frequency division absorption device includes a concentrating solar cell, a phase change material, a frequency division fluid, a transparent plate, and a concentrator. The concentrator gathers sunlight on the outside. A layer of transparent plate is laid outside the frequency division fluid, and a layer of phase change material is laid inside. The phase change material is coated on the outside of the oven. The frequency division fluid absorbs the heat energy generated by the solar energy and the heat energy generated by the concentrating solar cell to heat the oven. The sunlight concentrated by the concentrator is projected onto the concentrating solar cell to generate electrical energy and thermal energy. Among them, the frequency division fluid is a propylene glycol solution of CoSO4. The frequency division fluid first absorbs solar energy, then absorbs the heat emitted by the concentrating solar cell, and finally sends it to the left and right heat exchange coils of the oven.

3. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 2 is characterized in that: Concentrated solar cells are used to power the electrical control box of the oven.

4. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 3 is characterized in that: The oven includes an electric heater, a heat exchange coil, a fan motor, an electrical control box, a vortex ring device, and a bent pipe. The inner wall of the oven is a hollow structure. The fan motor is at the top of the outer side of the oven and is connected to the worm gear at the top of the cavity of the inner wall of the oven. A filter layer for filtering is provided on the outer side of the worm gear. Two heat exchange coils are arranged on the left and right sides of the oven, and the bottom is used to store asphalt to be heated. Two electric heaters are arranged on the left and right sides of the cavity of the inner wall of the oven, respectively. The liquid in the heat exchange coil is a divided frequency fluid. A vortex ring device is arranged in the middle of the left and right heat exchange coils. The vortex ring device is embedded at the inlet of the bent pipe and is flush with the cross-section of the inlet of the bent pipe. The bent pipe is fixed in the transverse wind cavity, and the left and right sides of the transverse wind cavity are air inlets. When the concentrating solar cell is working, the left and right electric heaters generate heat energy to heat the air to the required temperature. , and then the air is sent into the vortex ring device through the left and right air inlets; when the solar frequency division device is working, the frequency division fluid heats the air through the left and right heat exchange plates, and then the air is sent into the vortex ring device through the left and right air inlets; because the vortex ring device is embedded in the elbow, the wind sent by the vortex ring flows into the elbow at a 90° angle along the tangent direction of the elbow inlet, and the shape of the elbow is half-moon; when the asphalt is heated, vibration must be maintained, and the asphalt surface is dehydrated in the early stage. The generated water vapor returns to the top through the action of the fan motor and is discharged from the exhaust port. After the drying is completed, the oven enters the second stage, and the air volume of the vortex ring air supply is adjusted again to supply air to the asphalt in all directions until the asphalt is completely melted. Inside the oven, moisture and exhaust gas will be discharged through the exhaust port, and the heated asphalt is sent to the asphalt tank for storage.

5. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 4 is characterized in that: The aggregate preheating system comprises a crushing and screening machine, a first heat pipe heat exchanger, a second heat pipe heat exchanger, and a screener; the crushing and screening machine is connected to the GFRP filler tank and the GFRP aggregate tank, and then respectively fed into the first metering machine and the third metering machine; the first heat pipe heat exchanger is connected to the first metering machine, the filler is heated in the first heat pipe heat exchanger, and the particle size of the filler is less than 0.075 mm; the second heat pipe heat exchanger is connected to the third metering machine, and the aggregate is heated in the second heat pipe heat exchanger, and the particle size is greater than 0.075 mm; the heated aggregate and filler are fed into the mixing tank, wherein the heat pipe heat exchanger is made of flat tubes, and the thickness of the flat tubes is selected to be 1.2 mm and the width is 15 mm; the retired fan blades are made of glass fiber reinforced plastic GFRP; after GFRP passes through the crusher and screening machine, the product Fragments of various particle sizes are generated, among which those with a particle size of less than 0.075mm are sent to the GFRP filler tank for storage, and those with a particle size greater than 0.075mm are sent to the GFRP aggregate tank. According to the ratio requirements of different roads, different proportions of various materials are selected. The GFRP filler and ordinary mineral material are sent to the first metering device for weighing, and then sent to the first heat pipe heat exchanger after weighing. After the aggregate tank is screened by the screening machine, those with a diameter less than 0.075mm are sent to the mineral tank, and those greater than 0.075mm are sent to the third metering device. At the same time, the GFRP aggregate tank is also screened by the screener and sent to the third metering device. After being mixed in a certain proportion, it is sent to the second heat pipe heat exchanger; the flat tube heat exchanger adopts a countercurrent arrangement, and the thickness of the flat tube is selected to be 1.2mm and the width is 15mm.

6. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 5 is characterized in that the asphalt The asphalt is added in stages. In stage I, 80% of the total asphalt is directly delivered to the mixing tank by a pressure pump. In stage II, 20% of the total asphalt is delivered to the mixing tank through a siphon device. Stage I adds the asphalt all at once, and in stage II, the opening of the valve of the siphon system can be adjusted to control the flow rate of the asphalt, allowing the asphalt to be added and stirred at the same time.

7. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 6 is characterized in that: The mixing tank is connected to the asphalt modifier tank; the asphalt modifier tank contains three modifiers, and the specific mixing ratio with asphalt is 1% SBR and 3% SBS, and 2% silane coupling agent, which enhances the mechanical properties of asphalt concrete; the GFRP aggregate is finally sent into the mixing tank together with the asphalt for mixing, and the asphalt and the modifier are mixed before mixing. During the mixing process, the aggregate is added first, and then the filler and modified asphalt are added.

8. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 7 is characterized in that: The exhaust port waste heat recovery device includes an ultra-thin water belt for heat exchange, a paraffin layer, and an exhaust pipe. The outside of the exhaust pipe is coated with a paraffin layer, and the outside of the paraffin side is a layer of ultra-thin hot water belt. The water in the water belt exchanges heat with the modifier tank through the heat exchange coil, and the paraffin is used to store the heat of the exhaust port and the heat output to the water belt; wherein, the paraffin absorbs the waste heat of the exhaust pipe and melts to store the heat. After the exhaust gas is discharged, the first valve and the second valve are opened, and the ultra-thin water belt for heat exchange around the paraffin absorbs the heat of the paraffin, and the paraffin becomes solid again after heat dissipation for the next heat storage; the water that absorbs the heat of the paraffin passes through the second valve, enters the coil and undergoes convection heat exchange with the asphalt asphalt modification reagent tank to preheat the asphalt modifier; the water in the ultra-thin water belt for heat exchange becomes cold water after heat exchange, and flows back to the ultra-thin water belt for heat exchange in the exhaust pipe through the second valve for heat exchange.

9. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 8 is characterized in that: A gas filtering device is installed above the exhaust pipe. The filtering device adopts an activated carbon automatic replacement device, which is composed of an adsorption plate, a baffle, a rotating shaft, an activated carbon waste discharge port, and a waiting plate. The rotating shaft connects the adsorption plate and the waiting plate. There is a baffle with adjustable opening in each hole of the adsorption plate. Activated carbon is placed above the baffle. The adsorption plate stays in the filter and is replaced regularly. The adsorption plate is responsible for adsorbing the toxic gas generated at the exhaust port. According to the set adsorption time, the opening of the baffle is adjusted and the gas is regularly discharged into the activated carbon waste discharge port. After the adsorption of one adsorption plate is completed, it is returned to the vacant position of the waiting plate through the rotation and lifting action of the rotating shaft and activated carbon is added. At the same time, the waiting plate rises to the position of the adsorption plate through the rotating shaft to start adsorbing the toxic gas.

10. The method for producing high-performance asphalt concrete doped with retired wind turbine blades according to claim 9, characterized in that: A fine screen is placed in the lower part of the mixing tank to screen out some fine aggregates and fillers that are not well mixed with the asphalt at the bottom and send them to the collecting tank. They return to the top of the mixing tank along the conveying pipe to participate in the mixing of asphalt concrete. The fine screen and the collecting tank baffle are taken out from the exhaust port for cleaning and replacement, and the well-mixed asphalt concrete flows out from the bottom.

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