JPS6018763B2 - Asphalt pavement waste material heating regeneration method and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for heating and regenerating asphalt pavement waste and improvements to its apparatus.

Asphalt pavement waste generated when replacing asphalt pavement is used as landfill material and roadbed material, and contains a large amount of aggregate and asphalt. Proposed.

By the way, asphalt pavement waste materials are often stripped from several locations, and several types of waste materials with different compositions are mixed together, and the waste materials at a designated location are paved with several layers of different compositions. When waste wood is crushed, its particle size varies. Therefore, when recycled as an asphalt mixture, it is supplied to a heating device in a proportion according to the particle size. The above waste material contains a mixture of fine particles of 2.6 to 5 grains or less and coarse particles larger than that, but when these waste materials are fed into the hopper at once, the temperature near the inlet of the rotating dryer drum becomes comparatively high. Because of the combustion gas, which has a high temperature of about 4,000 to 600 degrees Celsius, the fine particles become hot and the attached asphalt burns, degrading the quality and sometimes generating yellow smoke containing harmful substances. This is extremely undesirable from the standpoint of quality control of the recycled mixture, and also poses problems in terms of recycling, such as causing pollution, and the conventionally proposed methods and devices have advantages and disadvantages that are not sufficient to completely solve this problem. It was something I couldn't say. This invention was made to completely solve the above problem, and its purpose is to rotate the fine particles in asphalt pavement waste directly so that they do not come into contact with the high temperature part of the combustion gas near the inlet of the rotating dryer drum. To provide a method and apparatus for heating and regenerating asphalt pavement waste material, which improves a dryer drum, reliably prevents asphalt deterioration, eliminates the causes of pollution, and obtains a high-quality asphalt mixture.

Embodiments of the present invention will be described below with reference to the drawings.

First, to give an overview of the method for heating and regenerating asphalt pavement waste material of the present invention, a rotary dryer drum is composed of an inner cylinder and an outer cylinder, waste scraping blades are provided in each cylinder, and coarse particles of the waste material are removed from the inner cylinder. Then, the fine particles of the waste material are supplied between the inner cylinder and the outer cylinder, that is, in the vicinity of the inlet of the base end of the rotary dryer drum, at a position that does not come into contact with the high temperature part of the combustion gas, so that the coarse and fine particles move separately. The waste material is flowed in parallel with the combustion gas from the base to the end of the dryer drum so that the coarse particles are at almost the same temperature as the combustion gas, so that the coarse particles are moved to a mixed state in the outer cylinder when the combustion gas has dropped to a temperature that does not deteriorate the fine particles. This is a method in which the asphalt pavement waste is heated to a regeneration temperature that is lower than the asphalt deterioration temperature through an ascending process.As shown in FIG.
A conveyor 1 supplies material A taken out via a feeder (not shown) from a storage hopper (not shown) that stores waste materials to be recycled and a new bone village storage hopper (not shown), and material A is input from this conveyor. a hopper 2, a screw feeder 3 in the hopper 2 (see Figure 2), and a support roller 4.
, 4 and rotated by a drive mechanism 5 at a constant speed.

The fixed boot 6 has an adjustment chamber 8 that is closed via a flange 7.
is connected to the control chamber 8 via a flange 9 to the burner 1.
The primary combustion chamber 11 is connected to the primary combustion chamber 11 having a primary combustion chamber 11 having a combustion chamber 11. 12 is an exhaust manifold, and the primary combustion chamber 11
is connected to a pipe 14 branching from an exhaust pipe 13 connected to the exhaust manifold 12, a fan 15 is provided in this pipe 14, and a normal temperature outside air intake pipe 16 is connected between the pipe 14 and the fan 15. There is.

In the figure, 17 is a screw conveyor, 18 is a mixer, 1
Reference numeral 9 denotes a discharge conveyor, a fixed base 21, a jack 21, and a support base 22 with a pin 23 pivoted thereon.By operating the jack 21, the fixed base 20 can be tilted around the pin 23. There is. The details of this device will be omitted since the one already proposed by the applicant of the present invention in Samurai Sho 51-110319 will be omitted, and here mainly the rotary dryer drum D improved in the device of the present invention will be explained in detail. As shown in FIG. 2, the rotary dryer drum D is provided with a fixed boot 6 at its base end, a hopper 2 is connected within the fixed boot 6, and a chute 3 is connected below the hopper 2. The rotary dryer drum D is composed of an outer cylinder 25 and an inner cylinder 26. As shown in FIG. As shown in FIG. is fixed. As shown in FIG. 2, the inner tube 26 has a predetermined length from the base end of the outer tube. By the way, as shown in an embodiment in FIG. 2, this inner cylinder 26 has a predetermined cylindrical wire mesh or punched mesh 30 removably attached to the end of the inner weaving pad. This wire mesh or punched silk has a mesh through which only fine particles of the asphalt wallet waste can pass, preferably a mesh through which fine particles with a size of 0 to 5 grains or 0 to 1 grain can pass through. are doing. On the inner surface of the outer cylinder, which corresponds to the length from the female end of the wire mesh 30 to the terminal end of the inner cylinder 26, there are feeding blades for sending out fine particle waste particles passing through the wire mesh or the punched silk 30. 31 are provided.
This is to assist the fine particle waste material to slide down the inner surface of the outer cylinder as it rotates. Next, the method for heating and regenerating asphalt pavement waste material having the above-mentioned structure of the present invention will be explained. First, material A consisting of asphalt waste material and new aggregate is transferred to a hopper 2 provided at the base of a rotating dryer drum D of a heating device. put it in.

Before this input, the internal temperature of the boots 6 and the drum that are encircled by the rotary dryer drum D is adjusted in the adjustment chamber 8, and the combustion gas temperature is approximately 400° to 600°.
Keep it at a certain level. In this state, the rotating dryer drum D
is driven and rotated by the drive mechanism 5, and the material A is rotated as described above.
Insert. The fine particles of the waste material in the input material are separated into pieces by a wire mesh or punched silk wire attached to the starting end of the inner cylinder 26 and fall into the outer cylinder 25 in a short time. Therefore, the fine particles slide down the inner surface of the outer cylinder 25 while being sent to the sending blades 31 without directly coming into contact with the combustion gas. On the other hand, coarse particles that do not pass through the wire mesh or punched mesh 30 are moved into the inner cylinder 26 and moved to the inner cylinder terminal end 26b while being scraped up by the scraping blades 26a as the inner cylinder rotates. Since the fine particles slide on the inner surface of the outer cylinder 25 in a short time, the asphalt on which the fine particles are attached is kept at a temperature that does not deteriorate, and the coarse particles come into contact with the combustion gas and exchange heat while the asphalt ends at the inner cylinder end 26b. At this point, the fine particles and coarse particles merge. From this point, the mixed woven grains and coarse grains are scraped up by scraping blades 25a provided on the outer cylinder 25, and fall within the rotating dryer drum D. Therefore, in this state, the temperature of the combustion gas G is as shown in FIG.
After heat exchange, both coarse and fine particles undergo the same temperature increase process to lower the temperature to a temperature that does not deteriorate the asphalt, so no asphalt deterioration occurs up to the exhaust manifold 12 at the discharge end. Since the waste material in the material thrown and discharged in this manner does not involve deterioration of asphalt or combustion of asphalt with fine particles attached, it is possible to obtain an asphalt mixture of extremely high quality. In the above embodiment, a wire mesh or punched mesh 30 as shown in FIG.
At the same time as the waste material is divided, it is dropped into the outer cylinder 25 within a short period of time, and the drum base is kept at a relatively high temperature (400 o - 60,000 o) so that it does not come into contact with the drum. For example, as shown in FIG. 5, without using a wire mesh or punched silk 30, conveyor la for lees grains and conveyor lb for pongee grains are connected to the inner cylinder 26 and outer cylinder 25, respectively, through dedicated chutes 3' and 3''. The coarse and fine particles may be supplied independently, and in this case as well, the same effects as described above can be achieved.Furthermore, according to another embodiment of the present invention,
As shown in Fig. 6, a conveyor lc for coarse and fine mixing is provided,
For this purpose, a vibration moderator B is installed to separate the striations, and using a dedicated phase grain chute 3' and a pongee grain chute 3'', the outer cylinder 25 and the inner cylinder 26 are separated, respectively, as shown in Fig. 5. It is also possible to supply a coarse particle fraction and a fine particle fraction. In this case as well, the same effects as described above can be achieved.As is clear from the above explanation, the method for heating and regenerating asphalt pavement waste material of the present invention The apparatus includes an outer cylinder having a raking blade on its inner peripheral wall, a predetermined length from the proximal end of the outer cylinder, supported concentrically via a support member, and a raking blade on the inner peripheral wall. A rotating dryer drum is constructed with the provided inner cylinder, allowing the fine particles of asphalt pavement waste to pass through or fall into the outer cylinder in a short time, thereby preventing the fine particles from coming into direct contact with the relatively high temperature gas at the base of the dryer drum. At the same time, the coarse particles are scraped up and moved into the inner cylinder, and from the end of the inner cylinder, they are mixed with fine particles heated at a temperature that does not deteriorate the inside of the outer cylinder. Since the temperature is increased to a regeneration temperature below the asphalt deterioration temperature,
It has the excellent advantage of being able to obtain high-quality asphalt mixed material without any asphalt deterioration while completely preventing the generation of harmful substances that cause pollution.

BRIEF DESCRIPTION OF THE DRAWINGS Figures 1 and 2 show an apparatus for heating and regenerating asphalt pavement waste material, which is a preferred embodiment of the present invention. 3 is a schematic cross-sectional view taken along the line m-m in FIG. 2, and FIG.
-A schematic sectional view taken along line W, FIG. 5 is an explanatory diagram showing an embodiment of another method of the present invention, FIG. 6 is an explanatory diagram showing an embodiment of another method of the invention, and FIG. 7 is a heating device. FIG. 2 is an explanatory diagram showing the state of temperature change of combustion gas and asphalt pavement waste in the interior.

Day: Abandoned village with asphalt pavement, G...
Combustion gas temperature, D...Rotating dryer drum, 2
5...Outer cylinder, 26...Inner cylinder, 25a,
26a... raking blade, 28... support member.

Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. In a method for heating and regenerating asphalt pavement waste material, the asphalt pavement waste material is moved into a rotating dryer drum which is a heating device, and combustion gas is sent in the same direction as the movement direction of the waste material to heat the waste material, The dryer drum,
It consists of an outer cylinder and an inner cylinder arranged concentrically up to a predetermined length of the outer cylinder, and at the base end of the dryer drum, the fine particles of the asphalt pavement waste are placed between the outer cylinder and the inner cylinder, while the coarse particles are placed between the outer cylinder and the inner cylinder. The fine particles are fed into the inner cylinder, and the fine particles are prevented from coming into contact with the high temperature part of the combustion gas near the inlet of the dryer drum, so that both coarse particle wastes undergo almost the same temperature rise process and reach a temperature below the deterioration temperature of the asphalt. A method for heating and regenerating asphalt pavement waste material, which is characterized by being heat-treated to a regeneration temperature. 2. An outer cylinder with raking blades provided on the inner circumferential wall, and an inner cylinder supported concentrically via a support member over a predetermined length from the proximal end of the outer cylinder, and with raking blades provided on the inner peripheral wall. The fine particulate part of the asphalt pavement waste material is supplied between the inner cylinder and the outer cylinder, and the coarse particulate part of the waste material is supplied to the inner cylinder, so that the fine particulate part does not come into contact with the high temperature part of the combustion gas. A heating regeneration device for asphalt pavement waste material characterized by being equipped with a rotating dryer drum.