Drying machine for asphalt pavement waste regeneration

Abstract

The invention provides a dryer for asphalt pavement waste regeneration, which can add a regeneration additive for recovering the function of old asphalt to a regenerated material while inhibiting the influence of hot air flowing in a kiln main body. The dryer (1) for asphalt pavement waste regeneration is provided with: a regeneration additive foaming device (71) for foaming a regeneration additive; and an injection port (731) that injects the foamed regeneration additive toward the inner wall surface of the kiln main body (10). The volume of the regeneration additive is increased by foaming the regeneration additive, and the regeneration additive can be jetted violently from the jet port (731). As a result, it is possible to add the regeneration additive to the regenerated material that has been heated and regenerated in the kiln main body (10) while suppressing the influence of the hot air in the kiln main body (10).

Description

Technical Field

[0001] The present invention relates to a dryer for recycling asphalt pavement waste, which heats and regenerates asphalt pavement waste generated by road construction or the like. Background Art

[0002] When asphalt paving waste excavated due to road construction, etc. is reused, the addition ratio of the regeneration additive for restoring the function of the asphalt is calculated based on the content of asphalt contained in the heated and regenerated asphalt paving waste (hereinafter referred to as "waste") and the degree of deterioration (needle penetration, etc.) and added, thereby restoring the function of the asphalt contained in the waste, which is then used in the manufacture of a recycled asphalt mixture.

[0003] Regarding the amount of recycling additives added to restore the function of old asphalt in waste, as shown in Patent Document 1 (Japanese Patent Gazette No. 2-91303), Patent Document 2 (Japanese Patent Gazette No. 8-333515), and Patent Document 3 (Japanese Patent Gazette No. 2005-154464), about 1 to 30% by mass of recycling additives are added based on the total amount of asphalt contained in the waste. The amount of asphalt contained in the waste is mostly about 5% by mass based on the total amount of the waste. Therefore, the amount of recycling additives added is less than 1.5% by mass based on the total amount of the waste, and the amount of recycling additives added is small relative to the amount of waste.

[0004] Regarding the operation of adding recycling additives to waste materials, it is sufficient to add the additives in any process of the manufacturing process of the recycled asphalt mixture. For example, as shown in Patent Document 4 (Japanese Patent Publication No. 61-40904), it can be a dryer having a hot hopper with a heating burner and a waste supply component arranged on one end side of a kiln main body that is tilted and supported to rotate freely, and a cold hopper with an exhaust flue and a discharge portion for waste after heating and regeneration (hereinafter, the waste after heating and regeneration or the waste during heating and regeneration is referred to as "recycled material") arranged on the other end side, and an injection port for spraying the recycling additive onto the recycled material discharged from the kiln main body is arranged on the cold hopper side, and a desired amount of recycling additive is sprayed onto the recycled material after heating and regeneration in the kiln main body.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2-91303

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 8-333515

[0009] Patent Document 3: Japanese Patent Application Publication No. 2005-154464

[0010] Patent Document 4: Japanese Patent Application Laid-Open No. 61-40904 Summary of the invention

[0011] Problem that the invention aims to solve

[0012] However, in the above-mentioned conventional device, an entrance and exit for maintenance in the kiln body is provided on the side of the cold material hopper. The location of the entrance and exit relative to the cold material hopper is often set to an optimal location determined from the perspective of the safety of the maintenance workers in the kiln body and the operation of the factory equipment, or a desired location of the factory equipment operator.

[0013] Therefore, the injection port for injecting the regeneration additive to the regeneration material cannot necessarily be arranged at the optimal position that is not affected by the hot air flowing in the kiln body in consideration of the maintenance workers. Thus, it is desirable to take some countermeasures to add the regeneration additive to the regeneration material in a manner that is not affected by the hot air flowing in the kiln body when there are restrictions on the arrangement of the injection port.

[0014] In view of the above, the present invention provides a dryer for recycling asphalt pavement waste material, which can add a recycling additive for recovering the function of old asphalt to the recycled material while suppressing the influence of hot air flowing in the kiln body.

[0015] Solutions for solving problems

[0016] In order to solve the above-mentioned problems, in the asphalt paving waste recycling dryer described in the technical solution 1 of the present invention, it is provided with a hot hopper on one end side of the kiln main body which is tilted and supported to rotate freely, and a cold hopper on the other end side of the kiln main body, the hot hopper has a burner for hot air supply and a waste supply component, the cold hopper has an exhaust flue for exhausting exhaust gas and a discharge part for recycled material obtained by heating and regenerating the waste. The asphalt paving waste recycling dryer is a parallel flow heating type asphalt paving waste recycling dryer that makes hot air and waste flow in the same direction to heat and regenerate the waste, and is characterized in that a plurality of scraping blades are arranged in a circumferential direction on the inner wall surface of the kiln main body, and are connected to the other end side of the kiln main body. There is a drum screen having meshes through which recycled materials with a particle size below a specified diameter that have been heated and regenerated can pass. A recycling additive foaming device is provided near the dryer for recycling asphalt paving waste. The recycling additive foaming device has a foaming component for foaming the recycling additive. The recycling additive is used to restore the properties of the asphalt component contained in the waste. A supply pipe for supplying the recycling additive foamed by the recycling additive foaming device is inserted into the kiln body from the cold hopper side. A spray port is provided at the front end of the supply pipe for spraying the foamed recycling additive toward the inner wall surface of the kiln body. The spray port is arranged on the rear half of the kiln body in the direction in which the waste flows downward and on the upstream side of the drum screen.

[0017] In addition, in the dryer for recycling asphalt paving waste described in Technical Solution 2, it is characterized in that a plurality of blocking bodies are arranged circumferentially at the connection portion between the kiln body and the drum screen, and the plurality of blocking bodies block the flow of a portion of the recycled material during heating and regeneration to retain the recycled material, and an area without scraping blades is provided on the upstream side of the blocking body, and the injection port is arranged in the area without scraping blades.

[0018] Effects of the Invention

[0019] According to the dryer for recycling asphalt pavement waste described in technical solution 1 of the present invention, the recycling additive is foamed to increase its volume, and the recycling additive can be violently sprayed from the injection port, thereby suppressing the influence of the hot air in the kiln main body and adding the recycling additive to the recycled material in the heating regeneration in the kiln main body.

[0020] In addition, according to the dryer for recycling asphalt pavement waste described in Technical Solution 2, by spraying and adding the recycling additive to the recycled material accumulated in a thicker layer in the injection area of ​​the recycling additive, that is, the area without scraping blades, it is possible to efficiently spray and add the recycling additive to a large amount of recycled material in the heating regeneration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an appearance diagram of a dryer for recycling asphalt paving waste.

[0022] Figure 2 This figure shows a part of a dryer for recycling asphalt pavement waste in cross section.

[0023] Figure 3 It is a schematic diagram showing the structure of the regeneration additive foaming device.

[0024] Figure 4 This is a diagram of the kiln main body and the supply nozzle as viewed from the side of the regeneration additive foaming device.

[0025] Description of Reference Numerals

[0026] 1. Dryer for recycling asphalt paving waste; 10. Kiln body; 11. One end; 12. The other end; 13. Scraping blades; 14. Blocking body; 15. Annular convexity; 20. Rotating mechanism; 21. Friction roller; 30. Supply conveyor; 40. Burner; 50. Drum screen; 60. Recycled material storage bin; 61. Exhaust flue; 62. Recycled material discharge section; 63. Meter; 64. Maintenance hatch; 70. Additive supply section; 71. Recycled additive foaming device; 72. Supply pipe; 73. Supply nozzle; 711. Recycled additive storage tank; 712. Pump; 731. Injection port; A. Central axis; S. Area. DETAILED DESCRIPTION

[0027] In the dryer for recycling asphalt paving waste of the present invention, it is provided with a hot hopper on one end side of a kiln main body which is tilted and supported to rotate freely, and a cold hopper on the other end side of the kiln main body. The hot hopper has waste supply components such as a burner for supplying hot air and a conveyor for feeding waste into the kiln main body, and the cold hopper has an exhaust flue for exhausting waste gas. The dryer for recycling asphalt paving waste adopts a parallel flow heating method in which hot air and waste flow in the same direction to heat and regenerate the waste.

[0028] In addition, a plurality of scraping blades are arranged in a circumferential direction on the inner wall surface of the kiln body, and a drum screen as a screening component is connected to the other end of the kiln body, and the drum screen has a mesh through which recycled materials with a predetermined particle size, for example, a particle size of 13 mm or less can pass. In addition, a regeneration additive foaming device is provided near the dryer, and the regeneration additive foaming device has a foaming component for foaming the regeneration additive, and the regeneration additive restores the properties of the asphalt component contained in the waste.

[0029] The regeneration additive foaming device is not particularly limited as long as it is a mechanism that increases the volume of the regeneration additive, such as a mechanism that adds water to the heated regeneration additive and utilizes the evaporation expansion of the water to foam the regeneration additive, or a mechanism that supplies ultrasonically vibrating air to the regeneration additive to foam the regeneration additive.

[0030] In addition, the cold hopper is provided with an inlet and outlet for maintenance such as for removing attachments in the kiln body. A supply pipe for supplying the regeneration additive foamed in the regeneration additive foaming device to the dryer is passed through the cold hopper and inserted into the kiln body in a manner avoiding the inlet and outlet, and an injection port connected to the front end of the supply pipe is arranged toward the inner wall surface near the rear end of the kiln body to inject the foamed regeneration additive.

[0031] The position of the inlet and outlet of the cold hopper is determined by the configuration of the peripheral equipment of the dryer. Therefore, the insertion position of the supply pipe into the kiln body changes according to the position of the inlet and outlet. Sometimes, the supply pipe may not be inserted to a position where the foamed regeneration additive can be directly sprayed onto the regeneration material in the heating regeneration. The regeneration additive whose viscosity is reduced by foaming is easily compatible with the regeneration material in the heating regeneration even when it is attached to the inner wall surface, so it does not need to be directly sprayed onto the regeneration material in the heating regeneration. Therefore, the insertion position of the supply pipe into the kiln body is not particularly limited.

[0032] Furthermore, since the regeneration additive may burn if supplied to a high temperature atmosphere near the hot hopper of the kiln body, an injection port is arranged on the cold hopper side where the temperature of the hot air in the kiln body decreases.

[0033] Furthermore, when the waste is heated and recycled by using the above-mentioned dryer for recycling waste asphalt pavement, first, the hot air supply burner is ignited to preheat the kiln body, and after the preheating is completed, the waste is supplied into the kiln body. The supplied waste is blown up by the blow-off blades arranged in a circumferential direction on the inner wall surface of the kiln body and falls, while contacting the hot air from the hot air supply burner, so as to be heated and recycled.

[0034] In addition, the regeneration additive foaming device supplies the regeneration additive foamed by adding water to the heat-treated regeneration additive to the injection port in the kiln body through the supply pipe. In addition, the supply amount of the regeneration additive supplied from the regeneration additive foaming device is calculated based on the degree of deterioration of the asphalt component contained in the waste and the amount of the waste supplied to the kiln body, so the degree of deterioration of the asphalt component contained in the waste is measured in advance and the addition ratio is calculated.

[0035] The waste in the kiln body is heated and regenerated to a predetermined temperature by contacting hot air while rolling down toward the other end of the kiln body. On the other hand, the regeneration additive foaming device sprays a predetermined amount of regeneration additive required to restore the function of the asphalt component contained in the waste from the injection port.

[0036] At this time, in the kiln body, hot air flows from one end to the other end, but the regeneration additive that increases in volume by foaming is not affected by the hot air and is violently ejected from the injection port toward the inner wall of the kiln body, and is added to the regeneration material in the heat regeneration process. Regeneration materials with a particle size below a specified size, such as a particle size below 13 mm, added with the regeneration additive are stored in a regeneration material storage bin provided at the lower position of the dryer through the mesh of the drum screen, and are used for the manufacture of regeneration asphalt mixtures. On the other hand, the heated regeneration materials with a particle size larger than the specified size, such as a particle size of more than 14 mm, are discharged from the cold hopper to the outside of the system, and are not used for the manufacture of regeneration asphalt mixtures, but are crushed by a crusher and put into the dryer again for heat regeneration.

[0037] In addition, it is preferred that a plurality of blocking bodies are arranged circumferentially at the connection portion between the kiln body and the drum screen to block the flow of a portion of the regenerated material during heating and regeneration and retain the regenerated material, and an area without scraping blades is provided on the upstream side of the blocking body, and the injection port is arranged in a manner so as to face the regenerated material during heating and regeneration that is deposited in a thicker layer near the bottom of the kiln body in the area without scraping blades.

[0038] In this way, the regeneration additive whose viscosity is reduced by foaming can be directly added to the regeneration material during heating and regeneration, and the regeneration material during heating and regeneration swings near the bottom of the kiln main body as the kiln main body rotates, so the regeneration additive whose viscosity is reduced and the regeneration material during heating and regeneration are properly mixed, thereby making it possible to efficiently and uniformly add the regeneration additive to a large amount of regeneration material.

[0039] In this way, the volume of the regeneration additive is increased by foaming, and the regeneration additive can be strongly injected from the injection port, and the regeneration additive can be added to the regeneration material being heated and regenerated in the kiln body while suppressing the influence of the hot air flowing in the kiln body. In addition, it is expected that the flow rate in the supply pipe is also faster than before, and it can be injected in a wide range according to the shape of the injection port, and even a small amount of the regeneration additive can be expected to be efficiently added to the regeneration material.

[0040] [Example]

[0041] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0042] Figure 1 This is an appearance diagram of a dryer 1 for recycling asphalt pavement waste according to an embodiment. Figure 2 The figure shows a partial cross-section of an asphalt pavement waste recycling dryer 1. The asphalt pavement waste recycling dryer 1 is a device for heating asphalt pavement waste excavated during road construction and the like to regenerate the waste. Figure 1 and Figure 2 As shown, the asphalt pavement waste recycling dryer 1 includes a kiln body 10 , a rotating mechanism 20 , a supply conveyor 30 , a burner 40 , a drum screen 50 , a recycled material storage bin 60 , and an additive supply unit 70 .

[0043] The kiln body 10 is a rotary drum kiln for heating and regenerating waste. The kiln body 10 is substantially cylindrical and has a space for heating and regenerating waste inside. The kiln body 10 has one end 11 where a burner 40 is arranged and the other end 12 where the regenerated material after heating and regeneration is discharged.

[0044] The kiln body 10 is supported in a posture slightly inclined relative to the horizontal direction in such a manner that the height of one end 11 is higher than the height of the other end 12. Therefore, the central axis A of the kiln body 10 is also slightly inclined relative to the horizontal direction. Figure 1 In the figure, the inclination is omitted. In addition, the kiln main body 10 is supported so as to be rotatable around the central axis A.

[0045] like Figure 2 As shown, the kiln body 10 has a plurality of scraping blades 13. The scraping blades 13 are blades for stirring the waste material put into the kiln body 10. The plurality of scraping blades 13 are arranged at regular intervals along the circumferential direction on the inner wall surface of the kiln body 10. Each scraping blade 13 protrudes inward from the inner wall surface of the kiln body 10.

[0046] In addition, if Figure 2 As shown, the kiln body 10 has a plurality of blocking bodies 14. The blocking bodies 14 are plates for blocking a portion of the discharge flow of the regenerated material during the heating and regeneration from the kiln body 10, thereby retaining the regenerated material during the heating and regeneration. The plurality of blocking bodies 14 are intermittently arranged along the circumferential direction on the inner wall surface of the other end portion 12 of the kiln body 10. That is, the plurality of blocking bodies 14 are arranged at the connection portion between the kiln body 10 and the drum screen 50 described later. The plurality of blocking bodies 14 protrude inward from the inner wall surface of the kiln body 10. In addition, each blocking body 14 extends in an arc shape along the inner wall surface of the kiln body 10. The height, length, gap interval of each blocking body 14, etc. of the blocking body 14 are appropriately adjusted and determined to obtain the desired amount of regenerated material retention.

[0047] The rotating mechanism 20 is a mechanism for rotating the kiln body 10. The rotating mechanism 20 includes a motor and a friction roller 21, which are not shown in the figure. The friction roller 21 rotates by the power output from the motor. In addition, the friction roller 21 contacts the annular convex portion 15 arranged around the outer peripheral surface of the kiln body 10. If the motor is rotated, the friction roller 21 rotates. Furthermore, the rotation of the friction roller 21 is transmitted to the annular convex portion 15, thereby rotating the kiln body 10 around the central axis A.

[0048] The supply conveyor 30 is a waste material supply member for supplying waste materials to the kiln body 10. The supply conveyor 30 is connected to one end 11 (hot hopper) of the kiln body 10. The supply conveyor 30 has an endless flat belt stretched between a pair of pulleys. The waste materials are placed on the upper surface of the flat belt and are transported to the inside of the kiln body 10 by the movement of the flat belt. However, the supply conveyor 30 may also be a screw type conveyor.

[0049] The burner 40 is a component for supplying hot air to the inside of the kiln body 10. The burner 40 is connected to one end 11 (hot hopper) of the kiln body 10. When the burner 40 is operated, hot air is supplied to the inside of the kiln body 10 along with the flame. The hot air flows from one end 11 to the other end 12 of the kiln body 10. That is, the dryer 1 for recycling asphalt pavement waste of this embodiment is a so-called parallel flow heating type dryer in which the conveying direction of the waste in the kiln body 10 and the direction in which the hot air flows are the same direction.

[0050] When the asphalt pavement waste recycling dryer 1 is used, the kiln main body 10 is rotated by the rotating mechanism 20, and hot air is supplied from the burner 40 into the kiln main body 10. The waste material input into the kiln main body 10 from the supply conveyor 30 is heated and regenerated by the hot air while being stirred by the blowing blades 13 as the kiln main body 10 rotates. In addition, the waste material is transported from one end 11 to the other end 12 along the inclination of the kiln main body 10.

[0051] The drum screen 50 is a component that selects the particle size and discharges the recycled material from the kiln body 10 to the recycled material storage bin 60. The drum screen 50 is connected to the other end 12 of the kiln body 10. Therefore, the drum screen 50 rotates with the kiln body 10 around the central axis A. In addition, the drum screen 50 has a mesh through which recycled materials with a predetermined particle size (for example, a particle size of 13 mm) or less can pass. The recycled material that has been heated and regenerated in the kiln body 10 is discharged to the recycled material storage bin 60 through the mesh of the drum screen 50.

[0052] The recycled material storage bin 60 is a container (cold hopper) for temporarily storing recycled materials discharged from the drum screen 50. The recycled material storage bin 60 is connected to the other end 12 of the kiln body 10. An exhaust flue 61 is connected to the upper end of the recycled material storage bin 60. Exhaust gas generated in the kiln body 10 is discharged to the exhaust flue 61 through the recycled material storage bin 60. In addition, the recycled material storage bin 60 has a recycled material discharge portion 62 with a discharge door (not shown) at the lower end. The recycled materials stored in the recycled material storage bin 60 are discharged to the meter 63 below through the recycled material discharge portion 62.

[0053] The recycled material storage bin 60 also has a maintenance hatch 64. The maintenance hatch 64 is an opening and closing door used when cleaning and scraping work are performed in the kiln body 10. The maintenance hatch 64 is provided on the side of the recycled material storage bin 60, facing the drum screen 50.

[0054] The additive supply unit 70 is a component for supplying a regeneration additive for restoring the properties of the asphalt component contained in the waste into the kiln body 10. Figure 1 and Figure 2 As shown, the additive supply unit 70 includes a regeneration additive foaming device 71 , a supply pipe 72 , and a supply nozzle 73 .

[0055] The regeneration additive foaming device 71 is a device for foaming the regeneration additive. The regeneration additive foaming device 71 is provided near the dryer 1. In this embodiment, the regeneration additive foaming device 71 is arranged outside the dryer 1 and the regeneration material storage bin 60.

[0056] Figure 3 Schematic diagram showing the structure of the regeneration additive foaming device 71. Figure 3 As shown, the regeneration additive foaming device 71 sprays water to the high-temperature regeneration additive sent from the regeneration additive storage tank 711 by the pump 712. In this way, the water vaporizes and expands to obtain the regeneration additive in a foamed state (foam state). However, the regeneration additive foaming device 71 may also be a mechanism that uses a well-known hollow ultrasonic horn or the like to supply ultrasonically vibrating air to the regeneration additive to foam the regeneration additive.

[0057] The supply pipe 72 is a pipe connecting the regeneration additive foaming device 71 and the supply nozzle 73. The supply pipe 72 passes through the side wall of the regeneration material storage bin 60 from the outside of the regeneration material storage bin 60, passes through the drum screen 50 and is inserted into the kiln body 10. The regeneration additive foamed in the regeneration additive foaming device 71 is supplied to the supply nozzle 73 through the supply pipe 72.

[0058] Figure 4This is a diagram showing the kiln body 10 and the supply nozzle 73 as viewed from the side of the regeneration additive foaming device 71. Figure 4 In FIG. 6 , the position of the maintenance hatch 64 is indicated by an imaginary line (dotted line). Figure 4 As shown, the supply pipe 72 penetrates a portion of the side wall of the recycled material storage bin 60 different from the maintenance hatch 64 and is inserted into the kiln main body 10 .

[0059] The supply nozzle 73 is provided at the front end of the supply pipe 72. The supply nozzle 73 has a jet port 731. The supply nozzle 73 jets the foamed regeneration additive supplied from the supply pipe 72 toward the inner wall surface of the kiln body 10 from the jet port 731. The jet port 731 is arranged at the rear half side of the kiln body 10 in the downward flow direction of the regeneration material during heating and regeneration and at a position upstream of the drum screen 50.

[0060] like Figure 2 As shown, the kiln main body 10 has a region S without the scraping blades 13 on the upstream side of the blocking body 14. The regenerated material blocked by the blocking body 14 is accumulated in the region S. If the amount of the regenerated material accumulated in the region S is more than a predetermined amount, it will gradually pass over the blocking body 14 and flow down to the drum screen 50. On the other hand, the gaps of the blocking bodies 14 arranged intermittently in the circumferential direction mainly play a role in discharging the regenerated material remaining on the upstream side of the blocking body 14 at the end of the heating treatment operation to the outside of the kiln main body 10. The injection port 731 of the supply nozzle 73 is arranged in the region S. Therefore, the regeneration additive injected from the injection port 731 is supplied to the inner wall surface of the kiln main body 10 in the region S or the regenerated material accumulated in the region S during heating and regeneration.

[0061] like Figure 4 As shown, when the kiln body 10 rotates, the regenerated material in the heating regeneration of the region S is accumulated in a thicker layer at a position slightly biased toward the downstream side in the rotation direction than the lowest part of the kiln body 10, and is repeatedly slightly piled up and collapsed at a position slightly biased toward the downstream side in the rotation direction, and flows along the inner wall surface of the kiln body. The injection port 731 of the supply nozzle 73 can also spray the regeneration additive obliquely downward toward the position where the regenerated material is accumulated. In this way, the regeneration additive can be efficiently supplied to the regenerated material in the heating regeneration, and the supplied regeneration additive can be uniformly added to the regenerated material by repeatedly slightly piling up and collapsing the regenerated material in the heating regeneration.

[0062] In addition, the supply nozzle 73 may spray the regeneration additive to the portion of the inner wall surface of the kiln body 10 where the regeneration material being heated and regenerated is not deposited. In this case, the regeneration material being heated and regenerated contacts the inner wall surface to which the regeneration additive is attached by the subsequent rotation of the kiln body 10. Thus, the regeneration additive can be indirectly supplied to the regeneration material being heated and regenerated.

[0063] As described above, the additive supply unit 70 sprays the regeneration additive from the injection port 731 while the volume of the regeneration additive is increased by foaming. Therefore, the regeneration additive can be sprayed vigorously from the injection port 731. In this way, by increasing the flow rate of the spray of the regeneration additive, the regeneration additive is difficult to flow due to the hot air in the kiln main body 10. Therefore, the regeneration additive easily reaches the inner wall surface of the kiln main body 10 or the regeneration material in the heating regeneration. As a result, the regeneration additive can be well added to the regeneration material in the heating regeneration in the kiln main body 10.

[0064] In addition, by foaming the regeneration additive, the viscosity of the regeneration additive is reduced. As a result, the regeneration additive is easily compatible with the regeneration material in the heating regeneration. Therefore, even if the amount of the regeneration additive added is small, the regeneration additive can be uniformly supplied to the regeneration material in the heating regeneration.

[0065] Furthermore, the regeneration additive is supplied to the lower temperature rear half instead of the front half where the temperature in the kiln main body 10 is particularly high. This prevents the regeneration additive from igniting due to the heat in the kiln main body 10 .

[0066] Industrial Applicability

[0067] The present invention can be widely used in a parallel flow heating type dryer for recycling asphalt pavement waste.

Claims

1. A dryer for recycling asphalt pavement waste, which is provided with a hot hopper on one end side of a kiln body supported to rotate freely by tilting, and a cold hopper on the other end side of the kiln body, the hot hopper having a burner for hot air supply and a waste material supply component, the cold hopper having an exhaust flue for exhaust gas discharge and a discharge part for recycled materials after heating and regeneration, the dryer for recycling asphalt pavement waste is a parallel flow heating type dryer for recycling asphalt pavement waste that heats and regenerates the waste by making hot air and waste flow in the same direction, and is characterized in that: A plurality of scraping blades are arranged circumferentially on the inner wall surface of the kiln body. A drum screen is connected to the other end of the kiln body. The drum screen has meshes through which the regenerated material after heating and regeneration with a particle size below a predetermined size can pass. A regeneration additive foaming device is provided near the asphalt pavement waste regeneration dryer, the regeneration additive foaming device having a foaming member for foaming a regeneration additive, the regeneration additive being used to restore the properties of the asphalt component contained in the waste. A supply pipe for supplying the regeneration additive foamed by the regeneration additive foaming device is inserted into the kiln body from the cold hopper side, The supply pipe has a nozzle at the front end thereof for injecting the foamed regeneration additive toward the inner wall surface of the kiln body. The injection port is disposed at a position on the rear half side of the kiln main body in the waste material downward flow direction and on the upstream side of the drum screen.

2. The dryer for recycling asphalt pavement waste according to claim 1, characterized in that: A plurality of blocking bodies are arranged in a circumferential direction at a connection portion between the kiln body and the drum screen, and the plurality of blocking bodies block a portion of the regenerated material during heating and regeneration so as to retain the regenerated material; and A region without scraping blades is provided on the upstream side of the barrier. The injection port is arranged in the region without the scraping blade.

Images