Reaction kettle system for waste asphalt regeneration and solid waste cooperative treatment

Abstract

The invention is applicable to the field of waste asphalt regeneration, and provides a waste asphalt regeneration and solid waste co-treatment reaction kettle system which comprises a pretreatment module, a main reaction module, a product separation module and a waste heat recovery module, the main reaction module comprises a reaction kettle body, a driving assembly, a gradient stirring assembly, a gradient stirring assembly, an ultrasonic microwave synergistic assembly and a dynamic regulation and control assembly; according to the invention, the mixing time is shortened to 1 / 3 of that of a traditional process, the gradient stirring assembly cooperates with a combined baffle through three stages of paddles (a flow guide propeller, a radial diffusion paddle and a bottom scraping and sweeping paddle), a three-dimensional flow field of'axial lifting-radial diffusion-bottom sweeping 'is constructed, only 8-10min is needed from feeding to uniform mixing (the uniformity is greater than 95%) of materials, and the mixing efficiency is greatly improved. And compared with a traditional anchor type stirring device (more than 30 minutes), the stirring time is shortened by 67%. Flow field simulation analysis shows that the flow velocity gradient of materials in the kettle is smaller than or equal to 0.5 m / s (the flow velocity gradient of traditional equipment is larger than 1.2 m / s), no obvious dead zone (the volume ratio of the dead zone is smaller than 3%) exists, and it is ensured that each particle can make contact with a reaction medium.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of waste asphalt regeneration, and particularly relates to a reaction kettle system for waste asphalt regeneration and solid waste cooperative treatment. BACKGROUND

[0002] Cooperative resource utilization of waste asphalt mixture (RAP) and industrial solid waste (such as construction waste and steel slag) is an important way to solve the problems of black pollution and gray pollution. The existing technology has the following bottlenecks:

[0003] Reaction stage: the flow field formed by the traditional stirring device is poor in uniformity (mixing time > 30 min), and the heating mode has a temperature gradient (> ± 10℃), so that the interface depth reaction of asphalt and solid waste cannot be realized; therefore, a reaction kettle system for waste asphalt regeneration and solid waste cooperative treatment is needed to solve the above problems. SUMMARY

[0004] The purpose of the embodiment of the application is to provide a reaction kettle system for waste asphalt regeneration and solid waste cooperative treatment to solve the problems proposed in the background technology.

[0005] To achieve the above purpose, the application provides the following technical scheme:

[0006] A reaction kettle system for waste asphalt regeneration and solid waste cooperative treatment, comprising a pretreatment module, a main reaction module, a product separation module and a waste heat recovery module, the main reaction module comprising a reaction kettle body, a driving assembly, a gradient stirring assembly, an ultrasonic microwave cooperative assembly and a dynamic control assembly;

[0007] The reaction kettle body comprises a reaction kettle main body, the top of the reaction kettle main body is provided with a feeding port and a waste gas outlet, and the bottom of the reaction kettle main body is provided with a discharging port;

[0008] The discharging port of the pretreatment module is sealingly connected with the feeding port of the reaction kettle body through a screw conveyor, the discharging port of the reaction kettle body is connected with the feeding port of the product separation module through a pipeline provided with a control valve, the waste gas outlet at the top of the reaction kettle body is connected with the gas inlet of the waste heat recovery module through a high-temperature resistant pipeline, and the two hot water outlets of the waste heat recovery module are respectively connected with the heating jacket in the spiral stirring and drying mechanism of the pretreatment module and the heat conduction oil circulation system of the reaction kettle body through heat preservation pipelines.

[0009] Further technical scheme, the driving assembly comprises a protective cover and a motor, the protective cover is fixedly connected to the upper surface of the reaction kettle main body, the output shaft of the motor is connected with a first gear, and the first gear is engaged with a second gear;

[0010] Further technical solutions, the gradient stirring assembly includes a stirring shaft, the stirring shaft is vertically installed through a mechanical seal device in the center of the top of the reaction kettle body, the second gear is connected outside the stirring shaft, the first gear is engaged with the second gear, the first gear and the second gear are arranged in the protective cover, the stirring shaft is connected with a flow guide propeller, a radial diffusion paddle and a scraping paddle, the radial diffusion paddle is arranged between the flow guide propeller and the scraping paddle, the diameter of the flow guide propeller is 800-1000mm, the pitch is 600-800mm, the diameter of the radial diffusion paddle is 1200-1500mm, the diameter of the scraping paddle is 1900-2400mm, and the gap between the scraping paddle and the kettle bottom is 2-3mm.

[0011] Further technical solutions, the heat conducting oil circulating assembly includes six baffles, the six baffles are fixedly connected to the inner wall of the reaction kettle body and are uniformly distributed in the circumferential direction, the baffles are embedded with serpentine heat exchange pipes (φ16*2mm), the top ends of the serpentine heat exchange pipes are connected with the stirring shaft through a same rotary joint, the rotary joint is connected to the top of the reaction kettle body, two through holes are formed in the stirring shaft, a cavity is formed in the stirring shaft, the serpentine heat exchange pipes are connected with the cavity through the rotary joint and the through holes, the top of the cavity is connected with the liquid inlet pipe through a bearing, the bottom ends of the serpentine heat exchange pipes are connected with a same liquid outlet pipe, the liquid outlet pipe is connected to the outside of the reaction kettle body, the liquid outlet pipe is connected with the heat conducting oil tank, the heat conducting oil tank is connected with the liquid inlet pipe through a circulating water pump, forming a closed circulation loop.

[0012] Further technical solutions, the ultrasonic microwave cooperation assembly includes 3 ultrasonic transducers (single power 500-600W, frequency 20kHz±1kHz), 6-8 groups of microwave generators (single power 1kW, frequency 2450MHz±50MHz) and 6-8 groups of infrared temperature measurement probes (measurement range 50-300℃, accuracy ±1℃), the ultrasonic transducers are embedded in the blades of the radial diffusion paddle, the ultrasonic transducers are connected with a conductive ring through a cable arranged in the stirring shaft, the conductive ring is connected with a power supply, the microwave generators are fixed to the side wall of the reaction kettle body, the infrared temperature measurement probes are installed at the intermediate position of the two groups of microwave generators, and the detection end of the infrared temperature measurement probe is flush with the inner wall of the kettle body.

[0013] Further technical solutions, the dynamic regulation component includes PLC control system, three groups of fiber spectrum probe (measurement range 400-1000nm, resolution 2nm) and two groups of laser particle sensor (measurement range 0.1-1000μm, accuracy ±2%), three groups of fiber spectrum probe are installed on the side wall (50mm from the inner wall) of the upper, middle and lower part of the reaction kettle main body respectively, two groups of laser particle sensor are inserted into the middle of the reaction kettle main body at 30°inclination (spot diameter 5mm), PLC control system adopts Siemens S7-1200 series, is equipped with 10.1 inch touch screen, is equipped with multi-parameter coupling control algorithm, can adjust the stirring speed (50-200r / min), ultrasonic power (0-100%), microwave intensity (0-100%) and material circulation amount in real time.

[0014] Further technical solutions, the pretreatment module includes double-roller crushing mechanism, three-layer vibrating screen separation mechanism and spiral stirring drying mechanism connected in sequence; the double-roller crushing mechanism includes rack A, variable frequency driving motor A, driving crushing roller, driven crushing roller and gear transmission set, the driving crushing roller and the driven crushing roller are installed in parallel in the bearing seat of the rack A, and the center distance of the two rollers is 200mm; the gear transmission set includes driving gear and driven gear meshing with each other, the driving gear is fixed to the protruding end of the driving crushing roller, and the driven gear is fixed to the protruding end of the driven crushing roller; the bottom of the rack A is provided with an inclined guide plate, and the end of the guide plate is opposite to the feed hopper of the vibrating screen separation mechanism;

[0015] The three-layer vibrating screen separation mechanism includes sieve box, vibrating motor, three-layer stainless steel screen and elastic support device, the sieve box is installed on the rack B through four groups of elastic support devices, and the vibrating motor is symmetrically installed in the middle of the two side walls of the sieve box; the three-layer screen is fixed horizontally in the sieve box in order from top to bottom; the bottom of the sieve box is inclined, and the low end is provided with a discharge port, and the outlets of the materials on the screen of each layer are connected to the return mechanism or the waste collection box through pipelines respectively;

[0016] The spiral stirring drying mechanism includes horizontal drying cylinder, electric heating jacket, spiral stirring shaft and variable frequency driving motor B, the drying cylinder is sealed through end covers at both ends, the feeding end is higher than the discharging end, and the cylinder wall is provided with a heat preservation layer; the spiral stirring shaft is supported through two end bearing seats, and continuous spiral blades are welded on the shaft body; the heating jacket is wrapped in the middle part of the drying cylinder, and four groups of platinum resistance temperature sensors are arranged in the inside of the cylinder wall, and are located at the feeding end, the middle part and the discharging end respectively.

[0017] Further technical solutions, product separation module includes horizontal spiral centrifugal mechanism, ceramic filter membrane filtration mechanism and plate distillation column mechanism;The horizontal spiral centrifugal mechanism includes drum, screw conveyor, differential and drive motor C;The drum feed port is connected with the main reaction kettle discharge port through pipeline, the feed pipe extends to the middle part of the drum, the solid phase outlet is located at the tapered end of the drum, and the liquid phase outlet is located at the overflow weir of the large end of the drum;The ceramic filter membrane filtration mechanism includes pressure-bearing filter tank, vertically installed ceramic filter membrane assembly, backflushing pump and filtrate storage tank.

[0018] Further technical solutions, waste heat recovery module includes fire-tube waste heat boiler, plate heat exchanger and circulating water pump set;The fire-tube waste heat boiler includes smoke pipe bundle, kettle drum, coal economizer and induced draft fan, and the smoke pipe bundle is arranged horizontally in the kettle drum;The plate heat exchanger is of stainless steel corrugated plate structure;The circulating water pump set includes two variable frequency centrifugal pumps.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] In the application, the mixing time is shortened to 1 / 3 of the traditional process, the gradient stirring assembly cooperates with the combined baffle through three-stage blades (diversion propeller + radial diffusion propeller + bottom-mounted scraping propeller) to build a three-dimensional flow field of "axial lifting-radial diffusion-bottom cleaning", and the material needs only 8-10 minutes from being put in to being uniformly mixed (uniformity > 95%), which is 67% shorter than the traditional anchor stirring device (more than 30 minutes). Flow field simulation analysis shows that the material flow velocity gradient in the kettle is ≤0.5 m / s (more than 1.2 m / s in the traditional equipment), and there is no obvious dead zone (dead zone volume ratio < 3%), so that each particle can contact the reaction medium;

[0021] In the application, the reaction degree and rate are doubled, the 20kHz ultrasonic transducer (power 500-600W) of the ultrasonic microwave cooperation assembly generates cavitation effect (local pressure > 100MPa), tears the interface boundary layer of asphalt and solid waste, and expands the interface contact area by 3 times;The 2450MHz microwave generator (6-8 groups) realizes internal "volume heating" of the material, and the temperature gradient is <±5℃ (the traditional heating is >±10℃). Under the synergistic action of the two, the waste asphalt regeneration reaction rate is increased by 60%, and the reaction degree is ≥98% (the traditional process is <85%);

[0022] In the application, the performance fluctuation range of the product is controlled within ±3%, the dynamic regulation assembly realizes real-time monitoring of the intensity change of the characteristic peak (such as 2910cm⁻¹ saturated hydrocarbon peak) of asphalt through 3 groups of optical fiber spectrum probes (resolution 2nm), and detects the particle dispersion degree (RSD <5%) of solid waste through 2 groups of laser particle size sensors (accuracy ±2%). The PLC system (Siemens S7-1200) completes the adjustment of the stirring speed (50-200r / min), ultrasonic power and microwave intensity within 10s through a multi-parameter coupling algorithm.

[0023] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Figure 1 This is a system block diagram of the present invention;

[0025] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0026] Figure 3 This is a rear-view stereoscopic structural diagram of the present invention;

[0027] Figure 4 This is a top-view, three-dimensional cross-sectional structural diagram of the present invention;

[0028] Figure 5 This is a frontal three-dimensional cross-sectional structural diagram of the present invention.

[0029] In the diagram: 1. Reactor body; 11. Reactor main body; 12. Feed inlet; 13. Waste gas outlet; 14. Discharge outlet; 2. Drive assembly; 21. Protective cover; 22. Motor; 23. First gear; 24. Second gear; 3. Gradient stirring assembly; 31. Stirring shaft; 32. Guide propeller; 33. Radial diffuser; 34. Scraper; 4. Gradient stirring assembly; 41. Baffle; 42. Serpentine heat exchange tube; 43. Rotary joint; 44. Through hole; 45. Cavity; 46. Liquid inlet pipe; 47. Liquid outlet pipe; 5. Ultrasonic-microwave co-processing assembly; 51. Microwave generator; 52. Infrared temperature probe; 53. Ultrasonic transducer; 54. Conductive ring; 55. Power supply; 6. Dynamic control assembly; 61. PLC control system components; 62. Fiber optic spectral probe; 63. Laser particle size sensor. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0032] like Figures 1-5 As shown, this embodiment of the invention provides a reactor system for the co-processing of waste asphalt recycling and solid waste, including a pretreatment module, a main reaction module, a product separation module and a waste heat recovery module. The main reaction module includes a reactor body 1, a drive component 2, a gradient stirring component 3, a heat transfer oil circulation component 4, an ultrasonic and microwave co-processing component 5 and a dynamic control component 6.

[0033] The reaction kettle body 1 comprises a reaction kettle body 11, the top of the reaction kettle body 11 is provided with a feed inlet 12 and a waste gas outlet 13, and the bottom of the reaction kettle body 11 is provided with a discharge port 14;

[0034] The discharge port of the pretreatment module is sealingly connected with the feed inlet 12 of the reaction kettle body 1 through a screw conveyor, the discharge port of the reaction kettle body 1 is connected with the feed inlet 12 of the product separation module through a pipeline provided with a control valve, the top waste gas outlet 13 of the reaction kettle body 1 is connected with the gas inlet of the waste heat recovery module through a high-temperature-resistant pipeline, and the two hot water outlets of the waste heat recovery module are respectively connected with the heating jacket in the spiral stirring and drying mechanism of the pretreatment module and the heat conduction oil circulation system of the reaction kettle body 1 through heat preservation pipelines.

[0035] The driving assembly 2 comprises a protective cover 21 and a motor 22, the protective cover 21 is fixedly connected to the upper surface of the reaction kettle body 11, the output shaft of the motor 22 is connected with a first gear 23, and the first gear 23 is engaged with a second gear 24;

[0036] The gradient stirring assembly 3 comprises a stirring shaft 31, the stirring shaft 31 is vertically installed through a mechanical sealing device at the center of the top of the reaction kettle body 11, the second gear 24 is connected outside the stirring shaft 31, the first gear 23 is engaged with the second gear 24, the first gear 23 and the second gear 24 are arranged in the protective cover 21, and a flow-guiding propeller 32, a radial diffusion paddle 33 and a scraping paddle 34 are connected outside the stirring shaft 31, the radial diffusion paddle 33 is arranged between the flow-guiding propeller 32 and the scraping paddle 34, the diameter of the flow-guiding propeller 32 is 800-1000mm, the pitch is 600-800mm, the diameter of the radial diffusion paddle 33 is 1200-1500mm, the diameter of the scraping paddle 34 is 1900-2400mm, and the gap between the scraping paddle 34 and the kettle bottom is 2-3mm;

[0037] In this embodiment, the mixing time is shortened to 1 / 3 of that of the traditional process, the gradient stirring assembly 3 cooperates with the combined baffle 41 through the three-stage paddle flow-guiding propeller+radial diffusion paddle 33+bottom-mounted scraping paddle 34 to construct a three-dimensional flow field of “axial lifting-radial diffusion-bottom cleaning”, and the actual measurement shows that the material needs only 8-10min from being put in to being uniformly mixed (uniformity >95%), which is 67% shorter than the traditional anchor stirring device (more than 30min). The flow field simulation analysis shows that the material flow velocity gradient in the kettle is ≤0.5m / s (more than 1.2m / s in the traditional equipment), there is no obvious dead zone (the dead zone volume ratio is <3%), and each particle can contact the reaction medium.

[0038] The heat conducting oil circulating assembly 4 comprises six baffles 41 fixedly connected to the inner wall of the reaction kettle body 11 and uniformly distributed in the circumferential direction, the baffles 41 are internally provided with serpentine heat exchange pipes 42 φ 16*2 mm, the top ends of the serpentine heat exchange pipes 42 are connected with the stirring shaft 31 through a same rotary joint 43, the rotary joint 43 is connected to the top of the reaction kettle body 11, two through holes 44 are formed in the stirring shaft 31, a cavity 45 is formed in the stirring shaft 31, the serpentine heat exchange pipes 42 are connected with the cavity 45 through the rotary joint 43 and the through holes 44, the top of the cavity 45 is connected with a liquid inlet pipe 46 through a bearing, the bottom ends of the serpentine heat exchange pipes 42 are connected with a same liquid outlet pipe 47, the liquid outlet pipe 47 is connected to the outside of the reaction kettle body 11, the liquid outlet pipe 47 is connected with a heat conducting oil tank, the heat conducting oil tank is connected with the liquid inlet pipe 46 through a circulating water pump, thereby forming a closed circulation loop.

[0039] The ultrasonic microwave cooperation assembly 5 comprises 3 ultrasonic transducers 53 (single power 500-600 W, frequency 20 kHz±1 kHz), 6-8 groups of microwave generators 51 (single power 1 kW, frequency 2450 MHz±50 MHz) and 6-8 groups of infrared temperature measurement probes 52 (measurement range 50-300℃, accuracy ±1℃), the ultrasonic transducers 53 are sealingly embedded in the blade of the radial diffusion paddle 33, the ultrasonic transducers 53 are connected with a conductive ring 54 through a cable arranged in the stirring shaft 31, the conductive ring 54 is connected with a power supply 55, the microwave generators 51 are fixed to the side wall of the reaction kettle body 11, the infrared temperature measurement probes 52 are installed at the intermediate position between two groups of microwave generators 51, and the detection end of the infrared temperature measurement probe 52 is flush with the inner wall of the kettle body.

[0040] In this embodiment, the reaction degree and rate are doubled, the 20 kHz ultrasonic transducer 53 (power 500-600 W) of the ultrasonic microwave cooperation assembly 5 generates a cavitation effect (local pressure >100 MPa), tears the interface boundary layer of the asphalt and the solid waste, and expands the interface contact area by 3 times; the 2450 MHz microwave generator 51 (6-8 groups) realizes “volume heating” inside the material, and the temperature gradient is <±5℃ (the traditional heating is >±10℃). Under the synergistic action of the two, the waste asphalt regeneration reaction rate is increased by 60%, and the reaction degree is ≥98% (the traditional process is <85%). For example, for the regeneration process of aged asphalt, the asphaltene content of the system can be reduced from 15% to 8% (the target value is 7-9%), the saturated fraction + aromatic fraction content is increased from 40% to 65%, and the performance index of new asphalt is reached.

[0041] The dynamic regulation assembly 6 comprises a PLC control system 61, three groups of fiber-optic spectrum probes 62 (measurement range: 400-1000 nm, resolution: 2 nm) and two groups of laser particle sensors 63 (measurement range: 0.1-1000 μm, accuracy: ±2%), the three groups of fiber-optic spectrum probes 62 are respectively installed on the side walls (50 mm away from the inner wall) of the upper, middle and lower parts of the reaction kettle main body (11), the two groups of laser particle sensors 63 are inserted into the middle part of the reaction kettle main body 11 at an angle of 30° (the spot diameter is 5 mm), the PLC control system 61 adopts the Siemens S7-1200 series, is equipped with a 10.1-inch touch screen, and is provided with a multi-parameter coupling control algorithm, so that the stirring speed (50-200 r / min), ultrasonic power (0-100%), microwave intensity (0-100%) and material circulation amount can be adjusted in real time.

[0042] In this embodiment, the fluctuation range of the product performance is controlled within ±3%, the dynamic regulation assembly 6 monitors the intensity change of the characteristic peak (such as the 2910 cm⁻¹ saturated hydrocarbon peak) of the asphalt in real time through the three groups of fiber-optic spectrum probes 62 (resolution: 2 nm), and the two groups of laser particle sensors 63 (accuracy: ±2%) detect the dispersion degree (RSD<5%) of the solid waste particles. The PLC system (Siemens S7-1200) adjusts the stirring speed (50-200 r / min), ultrasonic power and microwave intensity within 10 seconds through the multi-parameter coupling algorithm. Long-term operation data shows that the penetration (25°C) of the regenerated asphalt fluctuates by ≤±2 dmm (the standard requirement is ±5 dmm), the softening point fluctuates by ≤±1°C (the standard requirement is ±3°C), and completely meets the A-grade asphalt indexes in GB / T15180-2010, thereby solving the performance fluctuation problem caused by parameter loss of control in the traditional process.

[0043] The pretreatment module comprises a double-roller crushing mechanism, a three-layer vibrating screen separation mechanism and a spiral stirring and drying mechanism connected in sequence; the double-roller crushing mechanism comprises a rack A, a variable-frequency driving motor A (power: 15-22 kW), a driving crushing roller, a driven crushing roller and a gear transmission set, the driving crushing roller and the driven crushing roller are installed in the bearing seat of the rack A in parallel, the center distance of the two rollers is 200 mm, and the surfaces of the two rollers are respectively provided with crushing teeth in the shape of isosceles trapezoidal section (tooth height: 50 mm, tooth top width: 30 mm, tooth root width: 60 mm), and the tooth surface hardness is ≥HRC55; the gear transmission set comprises a driving gear and a driven gear meshing with each other, the driving gear is fixed to the protruding end of the driving crushing roller, the driven gear is fixed to the protruding end of the driven crushing roller, and the transmission ratio is 1:1; the bottom of the rack A is provided with an inclined guide plate (inclination angle: 45°), and the end of the guide plate is opposite to the feeding hopper of the vibrating screen separation mechanism;

[0044] In this embodiment, the broken particle size is accurately controllable, the double-roller crushing mechanism adopts isosceles trapezoidal crushing teeth (tooth height 50 mm, tooth top width 30 mm, tooth root width 60 mm) and 1:1 gear transmission design to ensure the synchronous reverse rotation of the double rollers (rotation speed 300 r / min), and the qualified rate of the first crushing of the material is > 90%. The measured data shows that the particle size deviation of the crushed material is ≤ ± 1 mm (the deviation of the traditional equipment is > ± 5 mm), avoiding the problems of "over-reaction" or "under-reaction" caused by uneven particle size in the subsequent reaction. For example, for solid waste aggregates with a particle size requirement of 3-15 mm, the proportion of the material in this interval after crushing by the system is ≥ 92%, which is increased by 35% compared with the traditional jaw crusher.

[0045] The three-layer vibrating screening mechanism includes a screen box, a vibrating motor (power 2.2-3 kW), three layers of stainless steel screens and an elastic support device. The screen box is installed on the rack B through four groups of elastic support devices (spring diameter 20 mm), the vibrating motor is symmetrically installed on the middle part of the two side walls of the screen box, the 22-axis of the motor is at an angle of 30° with the horizontal plane, and the three layers of screens are horizontally fixed in the screen box in the order from top to bottom. The upper layer of screen has a hole diameter of 15 mm ± 0.5 mm, the middle layer has a hole diameter of 8 mm ± 0.3 mm, and the lower layer has a hole diameter of 3 mm ± 0.2 mm. An upward material blocking plate (height 100 mm) is arranged at the edge of each layer of screen. The bottom of the screen box is an inclined structure (inclination angle 30°), and a discharge port is arranged at the low end. The outlets of the materials screened by each layer of screen are connected to the material returning mechanism or the waste collecting box through pipelines.

[0046] In this embodiment, the screening efficiency and classification accuracy are significantly improved. The three-layer vibrating screening mechanism cooperates with the 30° inclined screen box and the elastic support device (spring diameter 20 mm) to realize a classification efficiency of ≥ 92% by matching screens with different hole diameters (15 mm / 8 mm / 3 mm). The 100 mm high material blocking plate at the edge of each layer of screen effectively prevents material overflow, and the screening capacity reaches 10 t / h (the traditional equipment is < 6 t / h). Field tests show that the screening purity of the material with a target particle size of 3-15 mm is ≥ 95% (impurity content < 5%), which provides a homogeneous raw material basis for the subsequent reaction.

[0047] The spiral stirring and drying mechanism includes a horizontal drying cylinder (diameter 800-1000 mm), an electric heating jacket (power 30-40 kW), a spiral stirring shaft 31 and a variable frequency drive motor B (power 7.5-11 kW). The two ends of the drying cylinder are sealed by end covers, the feeding end is higher than the discharging end (horizontal inclination angle 5°), and the cylinder wall is provided with a heat preservation layer (thickness 50 mm). The spiral stirring shaft 31 is supported by two end bearing seats, and a continuous spiral blade (pitch 200 mm, thickness 10 mm) is welded on the shaft body. The gap between the edge of the blade and the inner wall of the drying cylinder is 5 mm ± 1 mm. The heating jacket is wrapped around the middle part of the drying cylinder (length proportion 70%), and the inner wall of the cylinder is provided with four groups of platinum resistance temperature sensors (measurement range 0-200℃) located at the feeding end, the middle part and the discharging end, respectively.

[0048] In this embodiment, the drying process is mild and the moisture content is stable. The spiral stirring drying mechanism adopts a 5° inclination design and a 5mm gap spiral blade, combined with a partition temperature control electric heating jacket (100-120℃), to realize the "dynamic stirring - uniform heating" of the material; 4 groups of platinum resistance temperature sensors (measurement accuracy ±0.5℃) monitor the temperature in the drying cylinder in real time to ensure that the moisture content of the material is stably controlled at 5%±0.5% (the traditional drying equipment fluctuation range is >±3%); the key advantage is that it avoids the oxidation aging of asphalt caused by local overheating (>180℃) (softening point reduction ≤2℃, traditional equipment reduction >10℃), and retains the original colloidal structure of asphalt, laying a foundation for high-quality raw materials for regeneration reaction.

[0049] The product separation module includes a horizontal spiral centrifugal mechanism, a ceramic filter membrane filtration mechanism, and a plate distillation column mechanism; the horizontal spiral centrifugal mechanism includes a drum (diameter 500-600mm), a spiral conveyor, a differential mechanism, and a driving motor C (power 11-15kW), the drum rotates at 3000-3500r / min, and the differential mechanism speed difference adjustment range is 5-30r / min; the drum inlet (12) is connected with the main reactor outlet through a pipeline, the feeding pipe extends to the middle of the drum, the solid phase outlet is located at the conical end of the drum (half cone angle 12°), and the liquid phase outlet is located at the overflow weir (height 50mm) of the large end of the drum; the ceramic filter membrane filtration mechanism includes a pressure-bearing filter tank (working pressure 0.3-0.5MPa), a vertically installed ceramic filter membrane assembly (pore size 0.1-0.05μm), a backwashing pump, and a filtrate storage tank, the filter membrane assembly adopts a 19-core bundle structure, and the effective filtration area is 5-8㎡; the plate distillation column mechanism includes a column body (diameter 800-1000mm), 20-25 layers of sieve plates, a reboiler (heating power 30-40kW), and a condenser (heat exchange area 20-30㎡), each sieve plate is provided with φ8mm sieve holes (80-100 holes), the overflow weir height is 50mm, and the downcomer cross-sectional area is 10% of the column cross-sectional area.

[0050] In this embodiment, the product purity and resource utilization rate are maximized, and the purity of the regenerated asphalt reaches more than 95%, and the three-stage separation process realizes accurate purification: the horizontal spiral centrifugal separation (separation factor 1200-1500) removes 99% of the large particle residues (solid phase oil content <1%), the ceramic filter membrane filtration (0.1-0.05μm) traps small impurities (turbidity <5NTU), and the plate distillation column (20-25 layers of sieve plates) separates light oil fractions (distillation range control accuracy ±2℃). The final product test shows that the ash content of the regenerated asphalt is <0.3% (traditional process >1%), the elongation (15℃) is ≥100cm, which meets the standard of road asphalt, and can be directly used for highway surface construction.

[0051] The waste heat recovery module comprises a fire-tube waste heat boiler, a plate heat exchanger and a circulating water pump set; the fire-tube waste heat boiler comprises a flue pipe bundle (φ51*3mm seamless steel pipe), a drum (diameter 800mm), a coal economizer and an induced draft fan, the flue pipe bundle is arranged horizontally in the drum, the flue gas flow is three return, the heating area is 20-30㎡, and the rated evaporation capacity is 1.0-1.5t / h (working pressure 0.7-1.0MPa); the plate heat exchanger is a stainless steel corrugated plate structure (heat exchange area 20-30㎡), the primary side is connected with the boiler hot water (150-180℃), and the secondary side is connected with the drying mechanism heating jacket (circulating flow 5-8m³ / h) and the main reaction kettle heat conducting oil system (circulating flow 3-5m³ / h) respectively; the circulating water pump set comprises two variable frequency centrifugal pumps (one for use and one for standby), the lift is 30-50m, and the flow is 10-15m³ / h.

[0052] In this embodiment, the energy saving and environmental protection and the leap progress of the automation level, the waste heat recovery rate breaks through 70%, the energy consumption is reduced by 44%, the fire-tube waste heat boiler (heating area 20-30㎡) recovers the heat in the reaction waste gas (250-300℃), generates 0.7-1.0MPa steam (evaporation capacity 1.0-1.5t / h), and is directly used for the distillation column reboiler (saves steam cost 60yuan / t); the plate heat exchanger (heat exchange area 20-30㎡) transmits the heat of the 150-180℃ hot water to the drying medium and the heat conducting oil system, so that the power consumption in the pretreatment stage is reduced by 50%. Comprehensive measurement, the unit product energy consumption is reduced from 500kW・h / t of the traditional process to 280kW・h / t, and the annual treatment of 10,000 tons of waste asphalt can save about 220,000 yuan of electricity fee (industrial electricity price 0.6yuan / kW・h);

[0053] The waste gas emission fully meets the standards, the secondary pollution is reduced, the waste gas is reduced to 60-80℃ after waste heat recovery, then is treated by activated carbon adsorption, and the emission concentration is: particulate matter <30mg / m³ (national standard <120mg / m³), SO2 <50mg / m³ (national standard <550mg / m³), which meets GB16297-1996 "Integrated Emission Standard of Air Pollutants". In terms of waste water, the condensate water (purity ≥95%) of the waste heat recovery system is used for the dust removal system, the water recycling rate is >80%, and "zero waste water discharge" is realized;

[0054] The whole process is automatically controlled, the operation difficulty is reduced, the PLC control system piece 61 (Siemens S7-1200) integrates a 10.1 inch touch screen, 28 parameters such as temperature, pressure and flow are displayed in real time, has the functions of automatic adjustment (adjustment period 10s), fault alarm (response time <1s) and remote monitoring. The operating personnel can work after 1 hour of training, the operation failure rate is reduced from 15% of the traditional manual operation to below 1.5%, and unattended operation can be realized (equipped with automatic feeding and discharging systems).

[0055] Working principle of the present application:

[0056] The working process of the pretreatment module includes crushing, screening and drying,

[0057] The crushing process is as follows: waste asphalt and solid waste are put into a double-roller crushing mechanism at a ratio of 3:1, the driving roller rotates under the action of the driving motor 22, and the driven roller rotates in the opposite direction synchronously through gear transmission (the driving gear and the driven gear are engaged, and the transmission ratio is 1:1), the trapezoidal crushing teeth (tooth height 50 mm, tooth top width 30 mm, tooth root width 60 mm, tooth surface hardness ≥HRC55) use the tooth shape structure to crush the materials, so that the particle size of the crushed materials is ≤15 mm, and the crushed materials slide into the screening mechanism through the inclined guide plate (inclination angle 45°) at the bottom of the rack A.

[0058] The screening process is as follows: the vibration motor (power 2.2-3kW, shaft line and horizontal plane included angle 30°) drives the screen box to vibrate, the screen box is installed on the rack B through 4 groups of elastic support devices (spring diameter 20 mm), and continuous vibration is generated. The materials are layered on the three-layer stainless steel screen (upper layer screen aperture 15 mm±0.5 mm, middle layer 8 mm±0.3 mm, lower layer 3 mm±0.2 mm, and a 100 mm high baffle is arranged at the edge of each layer of screen), >15 mm materials are connected to the return mechanism through the pipeline at the screen outlet for crushing again; 3-15 mm materials enter the drying mechanism through the inclined structure (inclination angle 30°, low end provided with a discharge port) at the bottom of the screen box; <3 mm materials enter the waste collection box through the corresponding outlet;

[0059] The drying process is as follows: 3-15 mm materials enter the horizontal drying cylinder (diameter 800-1000 mm, the feeding end is higher than the discharging end, the horizontal inclination angle is 5°, and the cylinder wall is provided with a 50 mm thick heat preservation layer) of the spiral stirring drying mechanism, the driving motor B (power 7.5-11kW) drives the spiral stirring shaft 31 to rotate, and the continuous spiral blades (pitch 200 mm, thickness 10 mm, the gap between the blade edge and the inner wall of the drying cylinder is 5 mm±1 mm) on the shaft body push the materials forward and stir-fry. The electric heating jacket (power 30-40kW, length ratio 70%) wrapped in the middle of the drying cylinder heats the materials, and 4 groups of platinum resistance temperature sensors (measurement range 0-200℃, located at the feeding end, middle and discharging end respectively) inside the cylinder wall monitor the temperature in real time, so that the materials are dried in an environment of 100-120℃, and the moisture content is stably controlled at 5%±0.5%, and the dried materials are discharged from the discharging end into the reaction kettle body 1.

[0060] The working process of the main reaction module includes gradient stirring, ultrasonic-microwave cooperation and dynamic regulation;

[0061] The process of gradient stirring is as follows: the variable frequency drive motor C (power 15-22 kW) drives the hollow stirring shaft 31 (diameter 110-130 mm) through the expansion sleeve coupling to rotate, and the stirring shaft 31 extends to the upper part of the conical section of the reaction kettle body 11. The three-stage blade assembly works together: the upper layer of the guide type propeller 32 (diameter 800-1000 mm, pitch 600-800 mm, left-handed) rotates to generate axial force, which pushes the material at the bottom of the reaction kettle body 11 upward; the middle layer of the radial diffusion paddle (33) (diameter 1200-1500 mm, 4 pieces of 45° folding leaves) rotates to throw the material coming from the axial direction to the four directions; the lower layer of the bottom scraping paddle 34 (diameter 1900-2400 mm, edge inlaid with polytetrafluoroethylene scraper, gap of 2-3 mm with the kettle bottom) rotates to scrape the material at the bottom of the reaction kettle body 11 to prevent deposition. At the same time, the six heat conducting oil circulation components 4 (width 120 mm, built-in serpentine heat exchange pipe 42, connected with the heat conducting oil channel in the stirring shaft 31 through the rotary joint 43) uniformly distributed on the inner wall of the reaction kettle body 11 block the circumferential movement of the material, and work together with the three-stage paddle to build a "axial lifting-radial diffusion-bottom cleaning" three-dimensional flow field, so that the mixing time of the material is shortened to 8-10 min, and the mixing uniformity is >95%;

[0062] The process of ultrasonic-microwave cooperation is as follows: three ultrasonic transducers 53 (single power 500-600 W, frequency 20 kHz±1 kHz) are sealed and embedded in the blades of the middle layer of the radial diffusion paddle 33, the transducer cable is led out through the center hole of the stirring shaft 31, and is connected with the top rotary seal type ultrasonic power supply 55. When working, 20 kHz ultrasonic waves are generated, which form cavitation effect (local pressure >100 MPa) in the material, tear the interface layer of asphalt and solid waste, and promote molecular diffusion. Six to eight groups of microwave generators (51) (single power 1 kW, frequency 2450 MHz±50 MHz) are fixed on the double-layer jacket (inner layer is 5 mm thick quartz glass, outer layer is 3 mm thick stainless steel shielding layer) of the side wall of the reaction kettle body 11 through flanges, the adjacent generators are at an angle of 30°, emit 2450 MHz microwaves into the kettle, realize internal heating of the material, and cooperate with the infrared temperature measurement probe 52 (measurement range 50-300℃, accuracy ±1℃, installed at the middle position of the two groups of microwave generators 51, the detection end is flush with the inner wall of the reaction kettle body 11) to monitor the temperature in real time, so that the temperature gradient in the kettle is <±5℃. The ultrasonic and microwave cooperation makes the reaction rate increase by 60%.

[0063] The dynamic control process is as follows: 3 groups of fiber spectrum probes 62 (measuring range 400-1000 nm, resolution 2 nm, respectively installed on the side wall of the upper, middle and lower part of the reaction kettle main body 11, 50 mm away from the inner wall) collect material spectrum data in real time, and analyze the asphalt regeneration degree (characteristic peak intensity change rate <3%); 2 groups of laser particle size sensors 63 (measuring range 0.1-1000 μm, accuracy ±2%, inserted into the middle of the reaction kettle main body 11 at an angle of 30°, spot diameter 5 mm) detect the solid waste particle dispersion degree (RSD <5%). The PLC control system 61 (using Siemens S7-1200 series, equipped with a 10.1-inch touch screen) receives sensor data, adjusts the stirring speed (50-200 r / min), ultrasonic power (0-100%), and microwave intensity (0-100%) in real time through the built-in multi-parameter coupling control algorithm; at the same time, the double screw metering pump (flow rate 0-50 L / h, accuracy ±0.5%) adjusts the material feeding amount, the electrically adjusted discharge valve (adjustment range 0-100%, response time ≤1 s) controls the material discharge and internal circulation amount (circulation amount is 3 times the feeding amount), and ensures that the reaction is always in the best state, and the product performance fluctuation is <±3%.

[0064] The working process of the product separation module includes centrifugal separation, filtration separation and distillation separation.

[0065] The process of centrifugal separation is as follows: the material after the reaction of the main reaction kettle enters the drum (diameter 500-600 mm) of the horizontal screw centrifugal mechanism through the pipeline, the driving motor C (power 11-15 kW) drives the drum to rotate (rotation speed 3000-3500 r / min, separation factor 1200-1500), and the differential mechanism makes the screw conveyor and the drum form a speed difference of 5-30 r / min. The material enters the drum through the feeding pipe (extending to the middle of the drum), and under the action of centrifugal force, the solid residue (such as solid waste aggregate) moves to the drum wall and is discharged from the solid phase outlet located at the conical end (half cone angle 12°) of the drum; the liquid mixture (containing regenerated asphalt, etc.) is gathered in the center of the drum and flows out from the liquid phase outlet through the overflow weir (height 50 mm) at the large end of the drum, and then enters the ceramic filter membrane filtration mechanism;

[0066] The process of filtration separation is as follows: the liquid mixture enters the pressure filtration tank (working pressure 0.3-0.5 MPa), and the ceramic filter membrane assembly (19-core bundle structure, pore size 0.1-0.05 μm, effective filtration area 5-8 m2) installed vertically in the tank traps small impurities, and the filtrate passes through the filter membrane and enters the filtrate storage tank. The backwashing pump is started periodically to backwash the filter membrane and remove the trapped impurities, thereby ensuring the filtration efficiency.

[0067] The process of distillation separation is that the filtrate enters the tower body (800-1000 mm in diameter) of the plate distillation tower mechanism through a pipeline, 20-25 layers of sieve plates are arranged in the tower, each layer of sieve plate is provided with φ8 mm sieve holes, the number of holes is 80-100, the height of overflow weir is 50 mm, and the cross-sectional area of the downcomer is 10% of the cross-sectional area of the tower, a reboiler (heating power of 30-40 kW) is arranged to heat the material at the bottom of the tower, so that different components in the material are evaporated according to the boiling point difference, the light components rise to the top of the tower, are condensed by a condenser (heat exchange area of 20-30 m²) and then collected, and pure regenerated asphalt and light oil are obtained, the heavy component product is obtained at the bottom of the tower, and accurate separation of asphalt components is realized (purity > 95%);

[0068] The working process of the waste heat recovery module includes waste heat collection, waste heat utilization and condensate water recovery.

[0069] The process of waste heat collection is that the high-temperature waste gas (temperature of 250-300 DEG C) generated by the reaction kettle body 1 enters the smoke pipe bundle (φ51*3 mm seamless steel pipe, transversely arranged in the boiler drum, the flue gas flow is three back, and the heating area is 20-30 m²) of the fire tube waste heat boiler through a high-temperature resistant pipeline, the waste heat is transferred to the water in the boiler drum, so that the water is evaporated to generate steam (rated evaporation of 1.0-1.5 t / h, working pressure of 0.7-1.0 MPa), the waste heat collection is completed, and the cooled waste gas (temperature reduced to 150-180 DEG C) enters the subsequent treatment link;

[0070] The waste heat utilization includes steam utilization and hot water utilization.

[0071] The process of steam utilization is that the steam generated by the waste heat boiler enters the reboiler of the plate distillation tower to provide heat for the distillation process, so that the heat energy is utilized in stages.

[0072] The process of hot water utilization is that the hot water generated by the waste heat boiler enters the primary side of the plate heat exchanger (stainless steel corrugated plate structure, heat exchange area of 20-30 m²), and exchanges heat with the circulating medium (circulating flow of 5-8 m³ / h) of the heating jacket of the drying mechanism and the circulating medium (circulating flow of 3-5 m³ / h) of the main reaction kettle heat conduction oil system in the secondary side. After absorbing heat, the heating jacket circulating medium is used for drying the material of the spiral stirring drying mechanism; after absorbing heat, the heat conduction oil system circulating medium provides heat energy for the heat exchange of the gradient stirring assembly 3 and the ultrasonic microwave cooperative assembly 5 of the reaction kettle body 1, so that the system energy consumption is reduced. The circulating water pump set (two variable frequency centrifugal pumps, one for use and one for standby, head of 30-50 m, flow of 10-15 m³ / h) drives the hot water to circulate in the waste heat recovery system, so that the heat is stably transferred;

[0073] The process of condensate water recovery is that the condensate water after heat exchange of the plate heat exchanger is recycled to the dust removal system through a pipeline, so that the water resource is recycled and utilized, and the energy and resource utilization rate is further improved.

[0074] The circuits, electronic components and modules involved are all prior art and can be implemented by those skilled in the art without further elaboration, and the content protected by the present application does not involve improvements to software and methods.

[0075] The above is only the preferred embodiment of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A reaction kettle system for waste asphalt regeneration and solid waste collaborative treatment, comprising a pretreatment module, a main reaction module, a product separation module and a waste heat recovery module, characterized in that: The main reaction module comprises a reaction kettle body (1), a driving assembly (2), a gradient stirring assembly (3), a heat conducting oil circulation assembly (4), an ultrasonic microwave cooperation assembly (5) and a dynamic control assembly (6). The reaction kettle body (1) comprises a reaction kettle main body (11), the top of the reaction kettle main body (11) is provided with a feeding port (12) and a waste gas outlet (13), and the bottom of the reaction kettle main body (11) is provided with a discharging port (14). The discharging port of the pretreatment module is sealingly connected with the feeding port (12) of the reaction kettle body (1) through a screw conveyor, the discharging port of the reaction kettle body (1) is connected with the feeding port (12) of the product separation module through a pipeline provided with a control valve, the top waste gas outlet (13) of the reaction kettle body (1) is connected with the gas inlet of the waste heat recovery module through a high-temperature resistant pipeline, and the two hot water outlets of the waste heat recovery module are respectively connected with the heating jacket in the spiral stirring and drying mechanism of the pretreatment module and the heat conducting oil circulation system of the reaction kettle body (1) through heat preservation pipelines.

2. The reaction kettle system for waste asphalt regeneration and solid waste collaborative treatment according to claim 1, characterized in that: The driving assembly (2) comprises a protective cover (21) and a motor (22), the protective cover (21) is fixedly connected to the upper surface of the reaction kettle main body (11), and the output shaft of the motor (22) is connected with a first gear (23).

3. The reaction kettle system for waste asphalt regeneration and solid waste cooperative treatment according to claim 2, characterized in that: The gradient stirring assembly (3) comprises a stirring shaft (31), the stirring shaft (31) is vertically installed through a mechanical sealing device at the center of the top of the reaction kettle main body (11), the second gear (24) is connected outside the stirring shaft (31), the first gear (23) is engaged with the second gear (24), the first gear (23) and the second gear (24) are arranged in the protective cover (21), and the stirring shaft (31) is connected with a flow guide propeller (32), a radial diffusion paddle (33) and a scraping paddle (34) outside. The diameter of the flow guide propeller (32) is 800-1000mm, the pitch is 600-800mm, the diameter of the radial diffusion paddle (33) is 1200-1500mm, and the diameter of the scraping paddle (34) is 1900-2400mm with a gap of 2-3mm from the kettle bottom.

4. The reaction kettle system for waste asphalt regeneration and solid waste collaborative treatment according to claim 1, characterized in that: The heat conducting oil circulating assembly (4) comprises six baffles (41) fixedly connected to the inner wall of the reaction kettle body (11) and uniformly distributed in a circumferential direction, the baffle (41) is internally provided with a serpentine heat exchange pipe (42), the top ends of the plurality of serpentine heat exchange pipes (42) are connected with the stirring shaft (31) through a same rotating joint (43), the rotating joint (43) is connected to the top of the reaction kettle body (11), the stirring shaft (31) is internally provided with two through holes (44) and a cavity (45), the serpentine heat exchange pipe (42) is connected with the cavity (45) through the rotating joint (43) and the through hole (44), the top of the cavity (45) is connected with a liquid inlet pipe (46) through a bearing, the bottom ends of the plurality of serpentine heat exchange pipes (42) are connected with a same liquid outlet pipe (47), the liquid outlet pipe (47) is connected outside the reaction kettle body (11), the liquid outlet pipe (47) is connected with a heat conducting oil tank, the heat conducting oil tank is connected with the liquid inlet pipe (46) through a circulating water pump, thereby forming a closed circulation loop.

5. The reaction kettle system for waste asphalt regeneration and solid waste collaborative treatment according to claim 1, characterized in that: The ultrasonic microwave cooperation assembly (5) comprises three ultrasonic transducers (53), 6-8 groups of microwave generators (51) and 6-8 groups of infrared temperature measurement probes (52), the ultrasonic transducer (53) is sealingly embedded in the blade of the radial diffusion paddle (33), the ultrasonic transducer (53) is connected with a conductive ring (54) through a cable arranged in the stirring shaft (31), the conductive ring (54) is connected with a power supply (55), the microwave generator (51) is fixed to the side wall of the reaction kettle body (11), the infrared temperature measurement probe (52) is installed at a position between two groups of microwave generators (51), and the detection end of the infrared temperature measurement probe (52) is flush with the inner wall of the kettle body.

6. The reaction kettle system for waste asphalt regeneration and solid waste collaborative treatment according to claim 1, characterized in that: The dynamic regulation assembly (6) comprises a PLC control system (61), three groups of optical fiber spectrum probes (62) and two groups of laser particle size sensors (63), the three groups of optical fiber spectrum probes (62) are respectively installed on the side walls (50 mm away from the inner wall) of the upper, middle and lower parts of the reaction kettle body (11), the two groups of laser particle size sensors (63) are obliquely inserted into the middle part of the reaction kettle body (11) at an inclination angle of 30°, the PLC control system (61) adopts a Siemens S7-1200 series and is provided with a 10.1-inch touch screen, and is internally provided with a multi-parameter coupling control algorithm, so that the stirring speed, ultrasonic power (0-100%), microwave intensity and material circulation amount can be adjusted in real time.

7. The reaction kettle system for waste asphalt regeneration and solid waste synergistic treatment according to claim 1, characterized in that: The pretreatment module comprises a double-roller crushing mechanism, a three-layer vibrating screen separation mechanism and a spiral stirring and drying mechanism connected in sequence.

8. The reaction kettle system for waste asphalt regeneration and solid waste collaborative treatment according to claim 1, characterized in that: The product separation module comprises a horizontal screw centrifugal mechanism, a ceramic filter membrane filtering mechanism and a plate distillation column mechanism.

9. The reaction kettle system for waste asphalt regeneration and solid waste synergistic treatment according to claim 1, characterized in that: The waste heat recovery module comprises a fire-tube waste heat boiler, a plate heat exchanger and a circulating water pump set.

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