High-mixing-amount hot mix plant regeneration system for asphalt pavement milling material and operation method of high-mixing-amount hot mix plant regeneration system

Abstract

The invention provides an asphalt pavement milling material high-mixing-amount plant-mixing hot regeneration system and an operation method thereof, and aims to improve the construction quality and durability of a high-mixing-amount RAP (recycled asphalt pavement material) mixture and reduce energy consumption and pollution emission at the same time. The system comprises six key steps of crushing and screening of the asphalt pavement milling material, oil-stone separation, fine screening, hot mix plant regeneration, mixing and stirring and smoke treatment. The method has the advantages of high efficiency, energy conservation and environmental protection, can be widely applied to the field of asphalt pavement regeneration, and improves the sustainability of road construction.

Description

Technical Field

[0001] The present invention relates to the field of road engineering material recycling, and in particular to a high-mix asphalt pavement milling material hot recycling system and an operating method thereof. Background Art

[0002] With the rapid development of road traffic construction, a large number of asphalt pavements have entered the maintenance and repair stage, and a large amount of asphalt pavement milling materials are generated every year. The traditional methods of treating waste asphalt mixtures mainly include direct disposal, cold recycling and hot recycling. Among them, plant-mixed hot recycling technology has become the focus of current research and application because it can achieve efficient reuse of waste asphalt mixtures while ensuring the performance of newly paved roads.

[0003] However, the existing factory-mixed hot recycling technology still has many technical bottlenecks. In the existing factory-mixed hot recycling process, the blending ratio of RAP is generally between 30% and 50%. If the blending amount is further increased, it may lead to problems such as decreased uniformity of the mixture, severe aging of asphalt, and decreased bonding performance of the mixture. Traditional factory-mixed hot recycling equipment usually adopts a single screening process, and the particle composition of asphalt pavement milling materials is complex. Particles of different specifications are mixed together, resulting in uneven grading, which affects the mixing quality and construction effect of the recycled materials. Traditional RAP heating methods include direct flame heating and indirect heating. Direct flame heating can easily cause asphalt combustion and aging, affecting the performance of recycled materials; while indirect heating methods have low heat transfer efficiency and result in high energy consumption. In addition, a large amount of smoke and harmful gases will be generated during the asphalt heating process, which will pollute the environment if not handled properly.

[0004] In view of this, in order to address the problems existing in the hot recycling construction of asphalt pavement milling materials, there is an urgent need for a high-mix asphalt pavement milling material hot recycling system and its operation method to improve the low recycling rate of high-mix RAP, uneven gradation of old materials, poor adhesion of recycled asphalt, serious heating pollution and other problems, improve the quality and construction adaptability of recycled mixtures, and promote the sustainable development of asphalt pavement. Summary of the invention

[0005] The purpose of the present invention is to provide a high-dosage plant-mixed hot regeneration system for asphalt pavement milling materials and an operation method thereof. The construction method has the advantages of high efficiency, energy saving, and environmental protection, and can significantly improve the construction quality and durability of high-dosage RAP recycled mixtures, and reduce production energy consumption and pollution emissions.

[0006] To achieve the above objectives, the present technical solution provides an operation method of a high-mix hot regeneration system for milled asphalt pavement, including the following specific steps:

[0007] Step 1: Crushing and screening: The asphalt milling material is conveyed to the separator through the feeding conveyor belt, and a separator is added through the separator inlet before entering the separator; after the separator mechanically crushes the asphalt milling material, the coarse aggregate and fine aggregate are separated through the coarse screen, and the coarse aggregate is discharged through the asphalt coarse aggregate outlet;

[0008] Step 2, oil-stone separation: fine aggregate enters the stone color sorter, the optical sensing module identifies the dark asphalt blocks, and drives the separation control execution module to transport the dark asphalt blocks to the extraction chamber; the dark asphalt blocks are mixed and dissolved with the extraction liquid in the extraction chamber, and the extraction mixture is evaporated in the evaporation tank to obtain the asphalt product; the light-colored asphalt blocks enter the air separation device;

[0009] Step 3: Fine screening: The light-colored asphalt blocks are sequentially screened by the turbine fan of the air separation device to remove dust, and the magnetic separation drum absorbs magnetic impurities, and then the asphalt fine aggregate screener driven by the polarization block is vibrated and classified, and the fine aggregates of different particle sizes enter the asphalt fine aggregate collection tank through the asphalt fine aggregate recovery channel;

[0010] Step 4, thermal regeneration: fine aggregate enters the regeneration drum through the recycled material elevator and is mixed with the new aggregate heated by the new aggregate heating drum; thermal resistance steel, V-shaped wing plates and angle-adjustable adjustment wing plates are set in the regeneration drum, and the regeneration drum is driven to rotate and heat through the saw gear and the drive motor, and the outlet temperature is monitored by the temperature sensor;

[0011] Step 5: Mixing and stirring: The heated recycled material enters the temporary storage bin for recycled material, and is mixed with new aggregate and regeneration agent in the mixing bin of the double-axis stirring arm in proportion through the metering bucket;

[0012] Step 6, flue gas treatment: The production flue gas is purified in turn by the activated carbon adsorption layer, condensation dust removal chamber, and water film atomization spray chamber. The wastewater enters the granite soaking liquid sedimentation tank for treatment. The purified flue gas is discharged through the exhaust chimney.

[0013] Preferably, in step one, the separator is connected to a dust collector, and the dust collector collects crushed dust through a fan; the aperture of the coarse screen is 10-20 mm.

[0014] Preferably, in step 2, a stirring device is provided in the extraction chamber, the extracting liquid is an organic solvent, and the heating temperature of the evaporation tank is 80-120°C.

[0015] Preferably, in step three, the wind speed of the turbine fan is adjusted to 5-15 m / s by the wind speed control knob; and the magnetic induction intensity of the permanent magnet of the magnetic separation drum is ≥0.5T.

[0016] Preferably, in step 4, the angle range of the wing plate is adjusted to 30-60°.

[0017] Asphalt pavement milling material high-mix hot recycling system, including the following devices:

[0018] Raw material bin: connected to the separator through a feeding conveyor belt. The separator is equipped with a separator inlet and a coarse screen. The asphalt coarse aggregate outlet is located on the right side of the separator.

[0019] Stone color sorter: including optical sensing module, separation control module, separation control execution module, the extraction chamber is provided with an extractant inlet, a vacuum pump and an evaporation tank, and the evaporation tank is provided with a coil heater;

[0020] Air separation device: including turbine fan, guide piece, baffle and dust collection outlet;

[0021] Magnetic separation device: including magnetic separation roller, wiping plate and magnetic impurity outlet;

[0022] Asphalt fine aggregate screener: equipped with inclined fine aggregate screen, polarization block and multi-stage asphalt fine aggregate recovery channel;

[0023] Regeneration drum: connected with the new aggregate heating drum, equipped with thermal resistance steel, V-shaped wing plate, adjustment wing plate, the drum body is equipped with saw gears and driven by a drive motor;

[0024] Mixing system: including temporary storage bin for recycled materials, weighing hopper and mixing bin equipped with double-axis mixing arms;

[0025] Flue gas treatment device: includes smoke inlet duct, activated carbon adsorption layer, condensation dust removal chamber, water film atomization spray chamber, granite soaking liquid sedimentation tank and exhaust chimney.

[0026] Preferably, the outlet of the regeneration drum is provided with a trunnion, the new aggregate heating drum is connected to the combustion chamber, and the combustion chamber is provided with an ignition protection door.

[0027] Preferably, in the flue gas treatment device, the smoke inlet pipe is a high-temperature resistant ceramic fiber pipe; the exhaust chimney is provided with a gas monitoring sensor for detecting the concentration of CO, NOx and particulate matter.

[0028] Preferably, the fine aggregate screens of the asphalt fine aggregate screener are arranged in layers along the vertical direction, with the apertures of the upper screen being 5 mm, the middle screen being 3 mm, and the lower screen being 1 mm.

[0029] Preferably, the stirring rate of the stirring chamber is 20-40 r / min, and the stirring time is 3-5 minutes.

[0030] Compared with the prior art, this technical solution has the following characteristics and beneficial effects:

[0031] 1. The present invention realizes the uniform conveying of milling materials of different particle sizes through the cooperation of the feeding bin and the conveying pipeline, avoids the accumulation or uneven distribution of materials, and ensures that the separator can fully play its role. The setting of the screening machine further improves the material classification accuracy, makes the subsequent color sorting and extraction more targeted, and improves the overall separation efficiency;

[0032] 2. The present invention uses the synergistic effect of the optical sensing module and the separation control module to realize the intelligent recognition and sorting of asphalt color; dark and light asphalt enter different asphalt fine aggregate recovery channels respectively, ensuring that asphalt of different components can be effectively classified, which helps to optimize the quality of recycled asphalt and enhance the application value of recycled materials;

[0033] 3. The present invention uses the synergistic effect of the high-temperature combustion chamber, the new aggregate heating drum and the regeneration drum to achieve efficient heating and temperature control of the milled material. With the temperature sensor, the heating condition of the recycled material can be monitored in real time to prevent local overheating or insufficient temperature, improve heating uniformity, and effectively improve the overall quality of the recycled asphalt mixture;

[0034] 4. The present invention utilizes a flue gas treatment device to perform multi-stage purification treatment on the waste gas generated during the heating process, wherein a condensation dust collector and a water film atomization spray chamber are used to remove particulate matter and some harmful gases, and an activated carbon adsorption layer further absorbs pollutants, thereby effectively improving the pollutant removal efficiency and ensuring that the hot mixing regeneration of the asphalt mixture plant is environmentally friendly and sustainable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of a primary screening device for asphalt pavement milling material according to an embodiment of the present invention;

[0036] Figure 2 Schematic diagram of an asphalt pavement milling material oilstone separation device according to an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of an air separation device and a magnetic separation device according to an embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of fine aggregate screening of asphalt pavement milling material according to an embodiment of the present invention;

[0039] Figure 5 Schematic diagram of a hot mixing regeneration device for asphalt pavement milling material plant according to an embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of a flue gas treatment device according to an embodiment of the present invention;

[0041] Figure 7 It is a schematic diagram of the factory-mixed hot regeneration drum structure of an embodiment of the present invention.

[0042] In the figure: 1. Raw material bin; 2. Feeding conveyor belt; 3. Separator; 4. Separator inlet; 5. Fan; 6. Dust collector; 7. Coarse screen; 8. Asphalt coarse aggregate outlet; 9. Separation control motor; 10. Separation control module; 11. Stone color sorter; 12. Optical sensing module; 13. Extraction agent inlet; 14. Vacuum pump; 15. Evaporation tank; 16. Coil; 17. Control valve; 18. Separation control execution module; 19. Light-colored asphalt conveying pipeline; 20. Guide piece; 21. Turbine fan; 22. Wind speed control knob; 23. Magnetic separation drum; 24. Wipe plate; 25. Drive motor; 26. Dust collection outlet; 27. Baffle; 28. Magnetic impurity outlet; 29. ​​Asphalt fine aggregate screen; 30. Fine aggregate screen ; 31. Polarization block; 32. Asphalt fine aggregate recovery channel; 33. Asphalt fine aggregate collection tank; 34. Regeneration cold material bin; 35. Regeneration material elevator; 36. Combustion chamber; 37. New aggregate inlet; 38. New aggregate heating drum; 39. Regeneration drum; 40. Regeneration material temporary storage bin; 41. Measuring bucket; 42. Stirring arm; 43. Stirring bin; 44. Flue gas treatment device; 45. Smoke inlet duct; 46. Activated carbon adsorption layer; 47. Condensation dust removal chamber; 48. Water film atomization spray chamber; 49. Exhaust chimney; 50. Induced draft fan; 51. Hemp stone soaking liquid sedimentation tank; 52. Ignition protection door; 53. V-shaped wing plate; 54. Thermal resistance steel; 55. Adjustment wing plate; 56. Temperature sensor; 57. Saw gear; 58. Ear shaft. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0044] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0045] Embodiment 1

[0046] The present invention provides an operation method of a high-mix asphalt pavement milling material hot regeneration system, comprising the following steps:

[0047] Step 1: Crushing and screening of asphalt pavement milling material: Asphalt milling material RAP is stored in the raw material bin 1. The right side of the raw material bin 1 is connected to the feeding conveyor belt 2, and the milling material is transported to the separator 3 through the feeding conveyor belt 2. A separator inlet 4 is arranged on the upper part of the separator 3. Before the RAP enters the separator 3, an appropriate amount of separator can be added through the separator inlet 4 to reduce the adhesion of old asphalt. After entering the separator 3, the separator 3 performs preliminary crushing on the asphalt milling material to break it into small particles. A coarse screen 7 is arranged at the bottom of the separator 3. The asphalt fine aggregate passes through the coarse screen 7 to enter the next step of separation, and the asphalt coarse aggregate is collected from the asphalt coarse aggregate outlet 8 on the right.

[0048] Preferably, the separating agent is a solution of anionic surfactant (such as sodium dodecyl sulfate) and water in a mass ratio of 1:50, and the added amount is 0.5%-1.5% of the mass of RAP. The separating agent is sprayed onto the surface of RAP through a high-pressure atomizing nozzle to reduce the adhesion between the old asphalt and the aggregate. The separator 3 adopts a jaw crusher, the gap of the crushing chamber is adjusted to 10-15mm, and the crushing speed is 200-300r / min, ensuring that the particle size of RAP after crushing is ≤20mm. The aperture of the coarse screen 7 is 15mm, and the coarse aggregate (>15mm) is discharged through the asphalt coarse aggregate outlet 8 and returned to the crusher for secondary treatment.

[0049] Step 2, separation of oil and stone from asphalt pavement milling material: After the initial crushing and screening, the asphalt milling material enters the stone color sorter 11. The optical sensing module 12 in the stone color sorter 11 is used to distinguish the color of the asphalt block. The optical sensing module 12 transmits the distinguishing signal to the separation control module 10. The separation control module 10 drives the separation control execution module 18 to operate through the separation control motor 9. The separation control execution module 18 separates the light and dark asphalt. The dark asphalt enters the right extraction chamber. The asphalt components in the dark asphalt are dissolved in the extract and an extraction mixture is obtained. After the extraction is completed, the extraction mixture enters the evaporation tank 15 on the right. After evaporation, the asphalt product is obtained. The asphalt product is output through the right grease delivery pipeline to achieve oil and stone separation. A control valve 17 is provided on the dark asphalt channel, and the control valve 17 is connected to the separation control module 10.

[0050] Preferably, the extract is a low-toxic solvent (such as kerosene or bio-based solvent) with a mass ratio of 3:1 to the dark asphalt block. The speed of the stirring device in the extraction chamber is 50-80r / min, the stirring time is 10-15 minutes, and the vacuum pump 14 maintains a negative pressure of -0.05MPa to accelerate the dissolution of the asphalt. The evaporation tank is indirectly heated by a coil 16, the heating medium is heat transfer oil, the temperature is controlled at 100-120°C, the purity of the evaporated asphalt is ≥95%, and the residual solvent is condensed and recycled.

[0051] Step three, fine screening of asphalt pavement milling materials: light-colored asphalt blocks enter the air separation device for further screening, and the turbine fan 21 generates high-speed airflow, so that lighter dust and impurities are suspended and enter the dust collection outlet 26 with the airflow, while the heavier aggregates continue to flow downward. The milling materials after air separation enter the magnetic separation device. The magnetic separation drum 23 is equipped with a high-strength permanent magnet to effectively absorb the magnetic impurities in the milling materials. The materials after magnetic separation enter the asphalt fine aggregate screener 29. The asphalt fine aggregate screener 29 drives the screen to vibrate through the polarization block 31 to achieve graded screening of materials of different particle sizes. The separated fine aggregate enters the asphalt fine aggregate collection tank 33 through the asphalt fine aggregate recovery channel 32 for subsequent use;

[0052] Preferably, the parameters of the air separation device are as follows: the wind speed of the turbine fan 21 is adjusted to 8-12 m / s by the knob 22, the air guide 20 is an arc-shaped air guide plate with an inclination angle of 45° to ensure uniform dispersion of the air flow, and the baffle 27 is inclined at 30° to prevent particles with a diameter greater than 2 mm from entering the dust collection outlet 26.

[0053] Magnetic separation drum 23 configuration:

[0054] The permanent magnet is made of neodymium iron boron material, with a magnetic induction intensity of ≥0.8T, a magnetic separation drum speed of 10-15r / min, a gap between the wiper plate 24 and the drum of 1-2mm, and magnetic impurities are discharged to a collection box through a magnetic impurity outlet 28.

[0055] Vibrating screener 29 parameters:

[0056] The inclination angle of the screen 30 is 15°, the vibration frequency of the polarization block 31 is 20-30 Hz, the amplitude is 3-5 mm, the sieve layer apertures are 5 mm, 3 mm, and 1 mm, and the fine aggregate (1-5 mm) enters the asphalt fine aggregate collection tank 33 through the recovery channel 32.

[0057] Step 4: Hot regeneration of milled asphalt pavement material: After screening, hot regeneration is carried out. The asphalt regenerated material enters the regeneration drum through the regeneration material elevator 35, and the new aggregate enters the heating drum 38 through the upper inlet. The regenerated material and the new aggregate are mixed in the regeneration drum. The milled material is heated evenly through the thermal resistance steel 54, V-shaped wing plate 53 and regulating wing plate 55 in the regeneration drum to reach the required temperature; the outlet of the regeneration drum 39 is provided with a temperature sensor 56 to monitor the material temperature and ensure temperature stability.

[0058] Preferably, the regeneration drum is indirectly heated by a natural gas burner, the temperature of the combustion chamber 36 is set to 600-800°C, the material in the drum is tumbled and heated by the alternating arrangement of the thermal resistance steel 54 and the V-shaped wing plate 53, the angle of the wing plate 55 is adjusted to 45°±5°, the material residence time is 8-12 minutes, the outlet temperature is monitored by the thermocouple temperature sensor 56, the PID controller dynamically adjusts the gas flow, and the temperature fluctuation range is ±5°C. The saw gear 57 has a module of 8 and is connected to the reducer (speed ratio 1:30) of the drive motor 25, and the drum speed is 5-8r / min.

[0059] Step 5: Mixing and stirring of asphalt pavement milling materials: The asphalt milling materials and new aggregates are mixed and heated in the regeneration drum 39 and then enter the temporary storage bin 40 for recycled materials. The lower part of the temporary storage bin 40 for recycled materials is connected to a metering bucket 41, and the recycled materials enter the mixing system in proportion through the metering bucket 41, and are mixed with new aggregates, regeneration agents and other additives. The mixing bin 43 uses a double-axis mixing arm 42 for mixing to improve uniformity;

[0060] In this embodiment, the operating conditions of the stirring chamber 43 are:

[0061] The rotation speed of the double-axis stirring arm 42 is 25-35r / min, the stirring time is 4 minutes, the amount of regeneration agent (such as aromatic oil) added is 2%-3% of the mass of the recycled material, and it is mixed with the new aggregate (limestone aggregate) at a mass ratio of 50%:50%, and the mixing uniformity is ≥95%.

[0062] Step six, treatment of hot regeneration smoke dust in asphalt pavement milling material plant: The smoke generated in the production process first enters the smoke treatment device through the smoke inlet pipe 45. The smoke first passes through the activated carbon adsorption layer 46, and the smoke after adsorption treatment enters the condensation dust removal chamber 47, so that some particulate matter in the smoke condenses into larger particles, which is convenient for subsequent removal. After condensation, the smoke enters the water film atomization spray chamber 48, and the smoke is fully washed by spraying water mist. The smoke purified by spraying enters the water seal overflow prevention tank to prevent the leakage of harmful gases. At the same time, the wastewater formed in the purification process is collected and enters the granite soaking liquid sedimentation tank 51 for treatment. The smoke after the above-mentioned multi-stage purification is powered by the induced draft fan 50 to transport the clean smoke to the exhaust chimney 49, and finally discharged into the atmosphere after meeting the environmental protection emission standards.

[0063] In this embodiment, the activated carbon adsorption layer 46 has an activated carbon particle size of 3-5 mm and a filling density of 450 kg / m 3 The empty tower flow rate of the adsorption tower is 0.3m / s, and the replacement cycle is every 100 hours.

[0064] Condensation dust removal chamber 47: The condensation temperature is controlled at 5-10°C, and a stainless steel fin tube heat exchanger is used, with a particle removal rate of ≥85%.

[0065] Water film atomization spray chamber 48: The spray liquid is circulating water with a pH of 6-8, the atomization particle size is 50-100μm, and the liquid-gas ratio is 2L / m 3 , the flue gas residence time is 3-5 seconds, further removing SO2 and NOx.

[0066] Mashi soaking liquid sedimentation tank 51: wastewater is filtered through the mashi layer (thickness 50cm) to adsorb heavy metals, the residence time is 2 hours, and the suspended solids in the effluent are ≤30mg / L.

[0067] Experimental data and technical effect verification

[0068] RAP dosage comparison experiment: In Example 1, the RAP dosage reached 60%, the Marshall stability of the recycled mixture was 12kN (specification ≥8kN), the flow value was 3.2mm, and the dynamic stability (60°C) was 4500 times / mm (specification ≥3000 times / mm), which was significantly better than the traditional process (dynamic stability was only 2800 times / mm when the dosage was 30%).

[0069] Flue gas emission data: particle concentration in the treated flue gas is less than 10mg / m 3 , SO2<50mg / m 3 , NOx<100mg / m 3 , in line with the "Comprehensive Emission Standards of Air Pollutants" (GB16297-1996).

[0070] Embodiment 2

[0071] Based on the same concept, the present invention relates to a high-dosage factory-mixed hot regeneration system for asphalt pavement milling materials, and its operating method includes crushing and screening of asphalt pavement milling materials, oil and stone separation of asphalt pavement milling materials, fine screening of asphalt pavement milling materials, factory-mixed hot regeneration of asphalt pavement milling materials, mixing and stirring of asphalt pavement milling materials, and treatment of smoke dust from factory-mixed hot regeneration of asphalt pavement milling materials.

[0072] like Figure 1 As shown, the raw material bin 1 is used to store asphalt milling material (RAP), and the milling material is conveyed to the separator 3 through the feeding conveyor belt 2. The separator 3 is provided with a separator inlet 4, and a separator can be added before the milling material enters the separator 3 to reduce the adhesion of the old asphalt. The milling material is initially crushed by mechanical action inside the separator 3, and a coarse screen 7 is provided to separate aggregates of different particle sizes, among which the larger asphalt coarse aggregate is discharged through the asphalt coarse aggregate outlet 8. A dust collector 6 is arranged on the right side of the separator 3, and a fan 5 is arranged on the dust collector 6 to collect dust generated during the screening process.

[0073] like Figure 2As shown, a separation control module 10 and an optical sensing module 12 are arranged in the stone color sorter 11. The separation control module 10 is located on the left side, and the lower separation control motor 9 is used to drive the system to operate, and the separation control execution module 18 is used to achieve accurate separation of materials. The lower part of the separation control execution module 18 is a light-colored asphalt conveying pipeline 19, which conveys the sorted light-colored asphalt blocks to enter the subsequent processing process. The optical sensing module 12 is located on the right side of the stone color sorter 11, mainly used to identify the color information of the material entering the system, and transmit the signal to the separation control module 10 to accurately control the separation process. The extraction chamber is located on the right side of the stone color sorter 11, and an extractant inlet 13 is arranged on the upper part. The right side is connected to a vacuum pump 14 for reducing the air pressure in the extraction chamber and dissolving the asphalt component. The right side of the extraction chamber is connected to an evaporator 15, which is heated by the lower coil 16 to evaporate and concentrate the extracted asphalt components.

[0074] like Figure 3 As shown, the turbine fan 21 is located on the left side of the air separation device, and the wind speed control knob 22 is located on the side of the turbine fan 21 to adjust the air flow speed. The guide member 20 is arranged at the air flow outlet of the turbine fan 21 to guide the air flow into the system so that the materials can be separated at an appropriate flow rate. A baffle 27 is arranged at the lower right side, and the baffle 27 is located before the dust collection outlet 26 to prevent larger particles or magnetic impurities from entering the dust collection system to ensure the separation effect. The dust collection outlet 26 is arranged on the right side of the device to collect dust brought out by the air flow. The magnetic separation device is located at the lower part of the air separation device, and a magnetic separation drum 23 is arranged at the center of the interior. A high-strength permanent magnet is arranged in the magnetic separation drum 23, which can absorb magnetic impurities in the milling material, such as iron filings. The wiper 24 is arranged on the upper and lower sides of the magnetic separation device, and the magnetic impurity outlet 28 is located on the right side of the magnetic separation drum 23. The magnetic impurities are discharged under the action of the wiper 24.

[0075] like Figure 4 As shown, the asphalt fine aggregate screen 29 includes a plurality of fine aggregate screens 30 of different particle sizes, and the fine aggregate screens 30 are arranged in sequence along the vertical direction; from top to bottom, the aperture of the screen holes of the fine aggregate screen 30 gradually decreases; a fine aggregate asphalt fine aggregate recovery channel 32 is arranged below each fine aggregate screen 30, and the fine aggregate asphalt fine aggregate recovery channel 32 is located on one side of the fine aggregate screen 30. Among them, the fine aggregate screen 30 is arranged at an angle, and the side of the fine aggregate screen 30 close to the fine aggregate asphalt fine aggregate recovery channel 32 is lower than the other side thereof, and a polarization block 31 is arranged on the fine aggregate screen 30, and the fine aggregate screen 30 is driven to vibrate by the polarization block 31. Fine aggregates of different particle sizes enter the asphalt fine aggregate recovery tank 33 through each fine aggregate asphalt fine aggregate recovery channel 32, thereby completing the recovery work.

[0076] like Figure 5As shown, the regeneration cold material bin 34 is located at the lower left, and is connected to the feeding conveyor belt 2 on the right side. The feeding conveyor belt 2 is connected to the regeneration material elevator 35 on the right side. The regeneration material enters the regeneration drum 39 after being lifted by the regeneration material elevator 35. The left side of the regeneration drum 39 is connected to the new aggregate heating drum 38. The left side of the new aggregate heating drum 38 is the combustion chamber 36. The front part of the combustion chamber 36 is arranged with an ignition protection door 52. The new aggregate inlet 37 is arranged at the top of the new aggregate heating drum 38 for adding the new aggregate heated by combustion. The right side of the regeneration drum 39 is connected to the temporary storage bin 40 for regeneration, which is used to temporarily store the regenerated regeneration material. The lower part of the temporary storage bin 40 for regeneration is connected to the metering hopper 41. The lower part of the metering hopper 41 is connected to the mixing system, where the regeneration material is proportioned, and then enters the lower mixing bin 43 for mixing evenly. The mixing bin 43 is arranged with a double-axis mixing arm 42 to improve the mixing efficiency.

[0077] like Figure 6 As shown, the flue gas treatment device 44 includes a flue gas inlet pipe 45, a condensation dust removal chamber 47, a water film atomization spray chamber 48, an exhaust chimney 49, and a granite soaking liquid sedimentation tank 51. The flue gas enters the right condensation dust removal chamber 47 from the flue gas inlet pipe 45, an activated carbon adsorption layer 46 is arranged below the condensation dust removal chamber 47, a condensation dust removal machine is arranged in the condensation dust removal chamber 47, a water film atomization spray chamber 48 is connected to the right side of the condensation dust removal chamber 47, a granite soaking liquid sedimentation tank 51 is arranged below the water film atomization spray chamber 48, an exhaust chimney 49 is arranged on the right side, and a negative pressure gauge is arranged in the exhaust chimney 49.

[0078] like Figure 7 As shown, the regeneration drum 39 is provided with heat-resistance steel 54, V-shaped wing plate 53, adjustment wing plate 55 and other structures inside to heat the milling material evenly. A temperature sensor 56 is installed at the right end of the regeneration drum 39 to detect the material temperature and ensure the temperature is stable. Saw gears 57 are arranged at the front and rear of the regeneration drum 39, and a driving motor 25 is arranged at the lower part of the saw gear 57 to make the regeneration drum 39 roll and heat. An ear shaft 58 is provided at the end of the regeneration drum 39.

[0079] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0080] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0081] Although the term "such as" is used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0082] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. The operation method of the high-mix hot regeneration system of milled asphalt pavement material is characterized by: The steps include: Step 1: Crushing and screening: The asphalt milling material is conveyed to the separator (3) through the feeding conveyor belt (2), and a separating agent is added through the separating agent inlet (4) before entering the separator (3); the separator (3) mechanically crushes the asphalt milling material, and then the coarse aggregate and fine aggregate are separated through the coarse screen (7), and the coarse aggregate is discharged through the asphalt coarse aggregate outlet (8); Step 2, oil-stone separation: fine aggregate enters the stone color sorter (11), the optical sensing module (12) identifies the dark asphalt blocks, and drives the separation control execution module (18) to transport the dark asphalt blocks to the extraction chamber; the dark asphalt blocks are mixed and dissolved with the extraction liquid in the extraction chamber, and the extraction mixture is evaporated in the evaporation tank (15) to obtain the asphalt product; The light-colored asphalt chunks enter the winnowing device; Step 3: Fine screening: The light-colored asphalt blocks are sequentially screened by the turbine fan (21) of the air separation device to remove dust, and the magnetic separation drum (23) to absorb magnetic impurities, and then the asphalt fine aggregate screener (29) driven by the polarization block (31) is vibrated and classified, and fine aggregates of different particle sizes enter the asphalt fine aggregate collection tank (33) through the asphalt fine aggregate recovery channel (32); Step 4, thermal regeneration: fine aggregate enters the regeneration drum (39) through the regeneration material elevator (35) and is mixed with the new aggregate heated by the new aggregate heating drum (38); a heat-resistance steel (54), a V-shaped wing plate (53) and an adjustable wing plate (55) are arranged in the regeneration drum (39), and the regeneration drum (39) is driven to rotate and heat by a saw gear (57) and a drive motor (25), and the outlet temperature is monitored by a temperature sensor (56); Step 5: Mixing and stirring: The heated recycled material enters the temporary storage bin (40) of recycled material, and is mixed with new aggregate and regeneration agent in a proportion in the mixing bin (43) of the double-axis stirring arm (42) through the measuring hopper (41); Step 6, flue gas treatment: the production flue gas is purified in sequence through the activated carbon adsorption layer (46), the condensation dust removal chamber (47), and the water film atomization spray chamber (48), and the waste water enters the hemp stone soaking liquid sedimentation tank (51) for treatment. The purified flue gas is discharged through the exhaust chimney (49).

2. The operating method according to claim 1, characterized in that: In step one, the separator (3) is connected to a dust collector (6), and the dust collector (6) collects crushed dust through a fan (5); the aperture of the coarse screen (7) is 10-20 mm.

3. The operating method according to claim 1, characterized in that: In step 2, a stirring device is provided in the extraction chamber, and the extracting liquid is an organic solvent; the heating temperature of the evaporation tank (15) is 80-120°C.

4. The operating method according to claim 1, characterized in that: In step three, the wind speed of the turbine fan (21) is adjusted to 5-15 m / s through the wind speed control knob (22); the magnetic induction intensity of the permanent magnet of the magnetic separation drum (23) is ≥0.5T.

5. The operating method according to claim 1, characterized in that: In step 4, the angle range of the adjusting wing plate (55) is 30-60°.

6. Asphalt pavement milling material high-mix hot regeneration system, characterized by: Includes the following devices: The raw material bin (1) is connected to the separator (3) via a feeding conveyor belt (2). The separator (3) is provided with a separator inlet (4) and a coarse screen (7). The asphalt coarse aggregate outlet (8) is located on the right side of the separator. A stone color sorter (11): comprising an optical sensing module (12), a separation control module (10), and a separation control execution module (18); an extraction chamber is provided with an extractant inlet (13), a vacuum pump (14), and an evaporation tank (15); and a coil (16) heater is provided in the evaporation tank; The wind selection device comprises a turbine fan (21), a flow guide (20), a baffle (27) and a dust collection outlet (26); The magnetic separation device comprises a magnetic separation roller (23), a wiper plate (24) and a magnetic impurity outlet (28); Asphalt fine aggregate sifter (29): provided with an inclined fine aggregate sieve (30), a polarization block (31) and a multi-stage asphalt fine aggregate recovery channel (32); Regeneration drum (39): connected to the new aggregate heating drum (38), equipped with heat resistance steel (54), V-shaped wing plate (53), and adjustment wing plate (55), the drum body is provided with a saw gear (57) and driven by a driving motor (25); The mixing system includes a temporary storage bin for recycled materials (40), a weighing hopper (41), and a mixing bin (43) equipped with a double-axis mixing arm (42); The flue gas treatment device (44) comprises a smoke inlet duct (45), an activated carbon adsorption layer (46), a condensation dust removal chamber (47), a water film atomization spray chamber (48), a hemp stone soaking liquid sedimentation tank (51) and an exhaust chimney (49).

7. The high-content hot regeneration system for milled asphalt pavement materials according to claim 6 is characterized in that: The outlet of the regeneration drum (39) is provided with a trunnion (58), the new aggregate heating drum (38) is connected to a combustion chamber (36), and the combustion chamber (36) is provided with an ignition protection door (52).

8. The high-content hot regeneration system for milled asphalt pavement materials according to claim 6 is characterized in that: In the flue gas treatment device (44), the smoke inlet pipe (45) is a high-temperature resistant ceramic fiber pipe; the exhaust chimney (49) is provided with a gas monitoring sensor for detecting the concentration of CO, NOx and particulate matter.

9. The high-content hot regeneration system for milled asphalt pavement materials according to claim 6 is characterized in that: The fine aggregate screens (30) of the asphalt fine aggregate screen (29) are arranged in layers along the vertical direction, with the apertures of the upper screen being 5 mm, the middle screen being 3 mm, and the lower screen being 1 mm.

10. The high-content hot regeneration system for milled asphalt pavement materials according to claim 6 is characterized in that: The stirring rate of the stirring chamber (43) is 20-40 r / min, and the stirring time is 3-5 minutes.

Images