KR100624345B1 - Reproduction method of waste asphalt concrete and it's apparatus - Google Patents

Abstract

The present invention relates to a method and apparatus for regenerating waste powder by crushing waste asphalt concrete to recover the adhesive strength by heat drying.

The present invention is characterized by the multi-stage rotary dryer drying furnace which regenerates the crushed product obtained by crushing the waste asphalt concrete to restore the adhesive strength. In order to be continuously heated and dried by gradually increasing high temperature without heat, the inside of the rotary dryer is formed into a continuous five-stage drying area between the inlet side and the outlet port, but the heating and drying of each stage drying zone based on the inlet side The temperature is 150 ± 50 ° C. in the first stage drying zone, 270 ± 50 ° C. in the second stage drying zone, 370 ± 50 ° C. in the third stage drying zone, 470 ± 50 ° C. in the fourth stage drying zone, and 670 ± 5 ° in the fifth stage drying zone. Maintaining each 50 ℃, the high temperature that gradually increases the pulverized product is fed to the inlet side and moved to the outlet side step by step It is to provide a method and apparatus for recycling waste asphalt, characterized in that the continuous heating, drying and regeneration of the furnace.

Waste asphalt, recycling equipment, 5 stage continuous rotary dryer

Description

Recycling method of waste asphalt concrete and it's apparatus

1 is a state diagram of the rotary dryer for explaining the present invention.

2 is a cross-sectional view of the rotary dryer of the present invention.

3 to 7 are cross-sectional views of each step drying zone formed in the rotary dryer.

*** Explanation of symbols for main parts of drawing ***

 1: dryer 2: expect

 4: Inlet Port 5: Outlet Port

 6: chimney 7: burner

11: inlet side 12: outlet side

21: motor 22: drive gear

31: ring gear 32: support ring

The present invention relates to a waste asphalt concrete continuous recycling method and apparatus for recycling waste asphalt concrete collected by the repaving work on asphalt pavement and various works on the asphalt pavement to be recycled for road pavement.

In general, asphalt and aggregate (gravel, crushed stone, etc.) obtained by mixing and heating is called asphalt concrete, asphalt concrete roads are commonly referred to as asphalt pavement.

As a road paved with asphalt concrete is subjected to heavy loads, such as frequent vehicle traffic, cracks, partial damage or irregularities occur on the pavement. In order to repair the asphalt pavement deformed by cracks, partial breakage, irregularities, etc., it is necessary to crush and remove part of the asphalt concrete that needs to be repaired, and then install and repair the new asphalt concrete in place. Done.

In addition, when repairing underground facilities such as water, sewage pipes, gas pipes, electric power and communication cables, which are buried underground, asphalt concrete is removed from the surface of the relevant pavement, After construction it will be paved with new asphalt concrete.

In the past, waste asphalt concrete extracted by crushing asphalt pavement is considered to be unusable, and most of it is disposed of, resulting in waste of resources and disposal of asphalt concrete in landfills or in specific areas such as rivers and seas. It caused a great pollution of the environment such as soil and water quality.

Therefore, in recent years, a method for recycling waste asphalt concrete in terms of recycling of resources while preventing the environment from being polluted by waste asphalt concrete has been introduced.

The waste asphalt concrete recycling apparatus of the prior art crushes the waste asphalt concrete collected by crushing on the pavement, and then the waste asphalt concrete pulverized (hereinafter referred to as `` pulverized '') is put into a drying furnace equipped with a burner and heated. Although a regeneration method is used, it is pointed out that the regeneration rate is very low because the burner is installed on the inlet side of the inlet, which is a disadvantage in that the inlet of the combustor is injected into the inlet side. As the asphalt is burned on the surface of the crushed powder in the process of being directly exposed to the flame, and the asphalt is burned, the adhesive force of the crushed powder is lost, which results in the unusable use.

Therefore, the present invention was devised to solve the problems shown in the prior art as described above, so that the pulverized product obtained by crushing the waste asphalt concrete can be heated so as not to contact the flame of the burner and simultaneously the pulverized product from a low temperature The present invention is to provide a method and apparatus for producing regenerated asphalt concrete with excellent adhesion by heating the asphalt of the ground surface and aggregates therein by gradually heating the temperature step by step with increasing temperature.

Means of the present invention for achieving the above object relates to a method for regenerating the crushed powder obtained by crushing the waste asphalt concrete to restore the adhesive strength by heating and drying the crushed powder is injected into the inlet side of the rotary dryer discharge outlet The inside of the rotary dryer is divided into five consecutive drying zones so that they can be continuously heated and dried by gradually increasing high temperature in the state of not being in contact with the flame of the burner while being transported to the side. The drying temperature in the drying zone of each stage is 150 ± 50 ℃ of the first stage, 270 ± 50 ℃ of the second stage, 370 ± 50 ℃ of the third stage, 470 ± 50 ℃ of the fourth stage, and 470 ± 50 ℃ of the fourth stage. 5 step drying zone Keep the drying area of 670 ± 50 ℃ and gradually put the pulverized product which is fed to the inlet side and moved to the outlet side step by step. Charge will, comprising a step of continuous heating, drying and without burn pulverized recovery of the original physical properties sikimyeo reproduced at a high temperature.

In the rotary dryer, the total time required for transporting and discharging the pulverized material injected into the inlet side to the outlet side is heated to and dried at a high temperature in each stage of the drying zone, which is 310 to 490 seconds and takes 40 ± 10 seconds of the first stage drying zone. The second to fifth drying zones are characterized in that it takes 90 ± 20 seconds each, and the rotary dryer has an inlet side in order to facilitate the transfer of the pulverized material injected into the inlet side to the outlet side It is characterized in that it is installed to be inclined upward 2 to 5 ° to the position higher than the outlet side, and in each drying zone of the rotary dryer is formed a plurality of wings for transporting and stirring the crushed object at regular intervals The transfer blades formed in the first step drying zone are bottomed through the inlet side. It is formed to protrude obliquely in a state lying in the direction opposite to the rotation direction of the rotary dryer so that the pulverized material introduced into the side can be transferred to the second step drying area from the bottom side without transferring upwardly, the second step Each of the stirring vanes formed in the drying zone transfers the pulverized material transferred from the first drying zone to the bottom of the second drying zone upwardly along the rotation direction of the rotary dryer, so that the central zone has the highest temperature in the second drying zone. Each end of the stirring blade is protruded toward the center of the shaft so as to fall toward the end portion is formed is bent 14 ± 3 ° in the direction of rotation of the rotary dryer, the stirring blade formed in the drying zone of the third step Transported the crushed product which passed through the second stage drying zone upward in the rotary direction of the rotary dryer from the bottom side. The end of the tip is directed toward the rotational direction of the tumble dryer with each stirring vane protruding toward the center of the shaft so that it can fall toward the position adjacent to the highest temperature in the third stage drying zone. ° bent and formed, each of the stirring blades formed in the fourth stage drying zone transfers the pulverized product passed through the third stage drying zone upwardly along the rotational direction of the rotary dryer at the bottom side, so that the temperature in the fourth stage drying zone The tip is bent by 32 ± 3 ° in the direction of rotation of the rotary dryer while the respective stirring vanes protrude toward the center of the shaft so as to fall toward the position far away from the highest central region. Stir blades formed in the 5th stage drying zone do not transfer the crushed product which passed through the 4th stage drying zone upwards It is a structure in which the cross section is formed in the shape of a mountain so that it can only be stirred, and the transfer blades and stirring blades formed in the drying zones of each step are configured to be transported and stirred while not directly contacting the flame of the burner. It is characterized by.

In addition, the stirring blades formed in each of the second to fourth stage drying areas of the rotary dryer are characterized in that they are formed to be offset from each other in a state divided into two front and rear.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an installation state diagram of a rotary dryer for explaining the present invention, the rotary dryer 1 is formed in a cylindrical shape is rotatably installed on the base (2).

The rotary dryer (1) is installed to rotate by a motor (21) mounted on the base (2), for this purpose, a ring gear 31 is mounted on the outer periphery of the rotary dryer (1), the ring gear One side (lower side in the drawing) of the drive 31 is engaged with the drive gear 22 for driving by receiving the power of the motor 21, and the support ring 32 mounted on both outer peripheral sides of the rotary dryer (1) They are supported by the support rollers 23 rotatably installed on the upper part of the base 2. Therefore, the rotary dryer 1 rotates on the base 2 by the driving of the motor 21.

In addition, the rotary dryer 1 has an inlet side 11 into which a crushed product (waste asphalt concrete crushed product) is input, and is installed to be inclined slightly higher than the outlet side 12, and the inclination angle is approximately 2 to 5 The angle of ° forms an inclination upward and thus the reason for limiting the rotary drier 1 itself to the inclination angle range of 2 to 5 ° is that the pulverized water is introduced into the inlet side 11 and the outlet side 12 It takes about 310 ~ 490 seconds to transfer the discharge to make the heating and drying of the pulverization is well done, the inlet side (11) when the inclination angle of the rotary dryer is less than 2 degrees close to the horizontal While the crushed powder is not transferred to the outlet side 12 or the feed rate is too slow, the transfer time may exceed 490 seconds, resulting in the overheating of the pulverized powder. If the inclination angle of the dryer (1) also forms at least 6 ° has a fear of being discharged to the state of the water feed rate grinding so faster pulverized product is not sufficiently heated and dried.

Therefore, the pulverized material injected into the inlet side 11 of the rotary dryer 1 is sufficiently exposed to the flame heat of the burner so that the pulverized product can smoothly move inside the rotary dryer and have the required adhesive strength in asphalt concrete. Most preferably, the rotary dryer 1 is inclined upwardly at an angle of about 2 to 5 degrees.

The inlet port 11 and the outlet port 12 of the rotary dryer 1 is provided with an inlet 4 and an outlet 5 fixedly installed to allow the rotating drum to rotate, and the inlet 4 The stack 6 is provided with an exhaust gas for discharging exhaust gas, and a burner 7 is provided at the discharge port 5.

When the pulverized material is put into the inlet 4, the opening is automatically opened by the load of the pulverized material, and in the state where the pulverized material is not put in, it is closed by its own weight so that the exhaust gas does not leak into the inlet, but only through the flue 6. An opening and closing plate 41 for guiding discharge is provided.

The flame spraying part of the burner 7 mounted to the discharge port 5 is inserted into the outlet port 34 adjacent to the discharge port side 34 so as to spray the flame from the central portion of the discharge port side 12 toward the inlet side 11. It is.

The rotary dryer 1 of the present invention is formed to have a length of approximately 8 to 10 m when calculating the daily production amount capable of regenerating waste asphalt concrete based on 400 to 500 tons, and the rotary dryer 1 according to the increase or decrease of the production amount. ) The overall length can be increased or decreased.

The interior of the rotary dryer 1 is divided into five consecutive drying zones in which the heating temperature gradually increases.

2 is a cross-sectional view of a rotating drum constituting the dryer of the present invention.

The continuous five-stage drying zone is composed of first to fifth stage drying zones 3a to 3e sequentially formed from the inlet side 11 toward the outlet side 12, and the inlet side 11 Is farthest from the flame sprayed from the burner (7), so the temperature of the first stage drying area (3a) formed at the inlet side (11) is the lowest and gradually increases in temperature toward the outlet side (12) of the burner (7). The dry matter is heated and dried under the condition that the temperature of the fifth stage drying zone 3e where the flame is directly sprayed is the highest. Stirring

It will be described for the configuration and operation.

First, the first stage drying area 3a is formed at the inlet side 11 farthest from the burner 7, and its internal temperature is primarily burned without burning the pulverized material introduced into the inlet side 11. It is a hot state of 150 ± 50 ℃ that can be preheated.

On the inner circumferential surface of the first step drying area 3a, a plurality of transfer blades 35 are formed at regular intervals, and each of the transfer blades 35 is rotated by the rotary dryer 1 as shown in FIG. It is formed in an oblique direction from the inlet side 11 toward the second stage drying area as shown in Fig. 2 while being inclined in the opposite direction to the direction.

As described above, each of the transfer blades 35 formed in the first drying region 3a is transferred to the bottom side of the second drying region 3b without transferring upwardly the pulverized product introduced through the inlet 4. Accordingly, the central region P1 of the first stage drying region 3a and the upper side thereof have an empty space through which the exhaust gas can flow smoothly, and the exhaust gas generated inside the rotary dryer 1 is discharged. The gas may be smoothly discharged to the stack 6 through the upper portion of the first step drying region 3a.

Next, the second stage drying zone 3b is formed in a state connected to the first stage drying zone 3a, and the internal temperature thereof is a high temperature state of 270 ± 50 ° C. Since the flame is sprayed horizontally from the center region P5 of (3e) toward the center region P1 of the first stage drying region 3a, the center region of each stage drying region has the highest temperature.

However, although the central region P2 of the second stage drying region 3b is the highest in the temperature range of 270 ± 50 ° C., the pulverized product can be efficiently heated and dried without burning the asphalt of the pulverized product in such a temperature range.

Therefore, in the second step drying zone 3b, a plurality of formed at regular intervals on the inner circumferential surface of the second step drying zone 3b in order to heat-dry the pulverized product to the temperature of the central zone P2 having the highest temperature. After the stirring blades 36 of the first stage preheated in the drying zone (3a) first and then conveyed upwardly as the rotary dryer (1) rotates the crushed product flowing into the second stage drying zone (3b) It is comprised so that it may fall toward the center area | region P2. To this end, each of the stirring blades 36 is bent 14 ± 3 ° toward the rotation direction of the rotary dryer in the state protruding toward the axis center of the rotary dryer 1 (see Fig. 4), One of the stirring blades 36 are formed in a staggered state (see FIG. 2) while being bisected forward and rearward in a state formed in the longitudinal direction of the rotary dryer 1, and thus agitated bidirectionally in this way. The wings 36 alternately drop the pulverized product toward the center region P2 due to the staggered phase difference, so that the pulverized substance can be evenly exposed to the temperature of the center region, thereby increasing the heating and drying effect of the pulverized substance. In addition, the stirring blades 36 are transferred to the third stage drying zone 3c while stirring the pulverized product.

Next, the third stage drying zone 3c is continuously connected to the second stage drying zone 3b and its internal temperature is maintained at a high temperature of 370 ± 50 ° C., and the third stage drying zone 3c is provided. Also, the temperature of the central region P3 is the highest. When the ground preheated in the second stage drying region 3b is exposed to the high temperature of the central region P3, the powder may be overheated. There is concern. Therefore, the plurality of stirring blades 37 formed at regular intervals on the inner circumferential surface of the third stage drying region 3c should be able to fall to the adjacent position beyond the central region P3 without dropping the pulverized product into the central region P3. do. To this end, the respective stirring blades 37 are bent at an angle of 21 ± 3 ° toward the rotary direction of the rotary dryer in a state where the stirring blades 37 protrude toward the axis center of the rotary dryer 1 (see FIG. 5). In addition, the stirring blades 37 are formed in a staggered state (see FIG. 2) while being bisected forward and rearward in a state formed in the longitudinal direction of the rotary dryer 1. The agitated stirring blades 37 are alternately dropped and heated and dried by a staggered phase difference toward the position adjacent to the center region P3 adjacent to each other. While stirring is transferred to the fourth step drying zone (3d).

Next, while the fourth stage drying zone 3d is connected to the third stage drying zone 3c, the internal temperature is maintained at a high temperature of 470 ± 50 ° C. The fourth stage drying zone 3d also includes a central zone ( When the temperature of P4) is the highest, the pulverized product, which is heated and dried in the third stage of the drying zone 3c, is exposed to the high temperature of the central zone P4, may burn. have.

Therefore, the plurality of stirring blades 38 formed at regular intervals on the inner circumferential surface of the fourth step drying region 3d does not affect the temperature of the central region P4 without dropping the pulverized product into the central region P4. In order to do this, each of the stirring vanes 38 is bent at an angle of 32 ± 3 ° toward the rotary direction of the rotary dryer while the stirring blades 38 protrude toward the axis center of the rotary dryer 1. (See FIG. 6), and each of the stirring blades 38 are formed in a staggered state (see FIG. 2) while being bisected forward and rearward while being formed in the longitudinal direction of the rotary dryer 3, As described above, the stirring blades 38 divided into two parts are heated and dried by alternately dropping the pulverized product toward a position far away from the center region P4 due to the staggered phase difference. 38 stations When the pulverized product is stirred, it is transferred to the fifth step drying zone 3e.

Next, the fifth step drying zone 3e is continuously connected in the fourth step drying zone 3d, and the internal temperature thereof is the highest because the flame of the burner 7 is directly injected. ± 50 ° C, and since the flame is being sprayed in the center region P5, in the fifth stage drying region 3e, the pulverized material is agitated and transported only at a position away from the center region P5, that is, at the bottom side. It can be heated and dried so that the pulverized product does not come into contact with the flame.

To this end, the stirring blade 39 formed at regular intervals on the inner circumferential surface of the fifth step drying zone 3e has a vertex formed in a cross section of a mountain shape toward the axis center of the rotary dryer 1, and is long in the longitudinal direction of the rotating drum. Is formed, the front side of the stirring blade 39 when the reference to the rotation direction of the rotary dryer 1 is formed in a wide width with a gentle inclination angle (internal angle of about 10 ~ 20 °), The rear side is formed with a shorter width with a steeper inclination angle (about 21 to 35 degrees) than the front side. Each of the stirring blades 39 formed as described above passes through the fourth stage drying area 3d. The pulverized product flowing into the bottom side of the fifth stage drying zone 3e is transferred to the outlet side 12 with stirring while being continuously turned upside down only at the bottom side of the central region P5 without moving upward. See FIG. 7)

On the other hand, in order to regenerate the pulverized material is transported while stirring in each drying zone with the temperature conditions as described above, the pulverized product must be exposed in the drying zone for each step for a suitable time, as a time for the rotary dryer (1) The total time required to pass through each drying zone is preferably in the range of about 310 to 490 seconds, based on the unit of seconds, and as the time passing through each drying zone, the first drying zone 3a. Is about 40 ± 10 seconds, and each of the second to fifth stage drying areas 3b, 3c, 3d, and 3e is about 90 ± 20 seconds.

However, when the time to be transferred to the drying zone of each stage of the rotary dryer 1 is 310 seconds or less, the pulverized product is exposed to the internal temperature of each stage of the drying zone for too short a time, so that the adhesive force decreases due to insufficient heating and drying. On the contrary, if it is more than 490 seconds, it is exposed to the internal temperature of the drying zone for each step for too long time, the pulverized product is overheated, asphalt flows down, and the phenomenon occurs that it is attached to the inner circumferential surface of the rotary dryer 1. May be generated.

Therefore, the pulverized product introduced into the inlet side 11 of the rotary dryer 1 is transferred to the outlet side 12 within the time range set in the above to be discharged to the outlet 5 so that the excellent asphalt asphalt recycled concrete It will be able to produce.

In the present invention as described above, when the pulverized material of the waste asphalt concrete being crushed and removed by various constructions made on the asphalt pavement is continuously inputted by a predetermined amount to the inlet of the rotary dryer, the pulverized material is dried from the first step drying area to the fifth step. The high amount of waste asphalt concrete is generated, such as in the construction site of rebuilding asphalt pavement, by providing the effect of gradually heating and drying the asphalt pavement with the required adhesion in asphalt concrete during the time to be transferred to the area. Waste asphalt concrete, which is partially demolished at construction sites, water and sewage works, gas pipelines, electric power and communication cables, or various construction sites that are newly established, can be recycled as a resource. As to provide an advantage to be able to solve the resulting environmental pollution.

Claims (5)

In the method for regenerating the crushed powder obtained by crushing the waste asphalt concrete to restore the adhesive strength, Five stages of continuous drying between the inlet and outlet through the inside of the rotary drying furnace so that the pulverized material can be continuously heated and dried by gradually increasing high temperature heat without being in contact with the flame of the burner while being fed to the inlet side and transported to the outlet side. The drying drying temperature of each stage drying zone is 150 ± 50 ℃ for the first stage, 150 ± 50 ℃ for the second stage, 270 ± 50 ℃ for the second stage, and the third stage. The drying zone 370 ± 50 ℃, the fourth stage drying zone 470 ± 50 ℃, the fifth stage drying zone 670 ± 50 ℃, respectively, characterized in that the pulverized material is continuously heated, dried and regenerated Waste asphalt recycling method. The method of claim 1, The total time required for transporting and discharging the pulverized material introduced into the inlet side of the rotary drying furnace to the high temperature of the drying zone at each step is discharged to the outlet side to achieve 310 to 490 seconds, and 40 ± 10 for the first stage drying zone. Seconds are required, waste asphalt regeneration method characterized in that it takes 90 ± 10 seconds for each of the second to fifth stage drying zones. In the drying furnace for recycling waste asphalt concrete, in which a rotating drum drying furnace is mounted on a base and rotatably installed by a driving motor for recycling waste asphalt concrete, The burner is formed on the outlet side opposite the raw material inlet of the rotating drum, and the first aggregate is indirectly heated to a high temperature as the input aggregate is moved toward the outlet side without being directly in contact with the flame. The drying furnace has a drying zone up to and with each drying zone configured with different transfer angles of the transfer blades and stirring blades, while the inlet side is lower than the inlet side of the pulverized product, the inclined angle is inclined at a range of 2 to 5 °. Drying furnace for recycling waste asphalt concrete, characterized in that the structure is installed to be rotatable. delete The method of claim 3, wherein Each of the stirring blades formed in each of the second to fourth stage drying zones of the rotating drum has an attachment end formed toward an axis center of the rotating drum, and a free end bent inclined toward the rotation direction of the rotating drum at the end of the attachment end. The bending angle of the free end of each stirring blade is 14 ± 3 ° for the second stirring blade, 21 ± 3 ° for the third stirring blade and 21 ± 3 ° for the fourth stirring blade. Drying furnace for recycling waste asphalt concrete, characterized in that 32 ± 3 °.

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