JP5500628B2 - Heat regeneration method for asphalt pavement waste - Google Patents

Description

The present invention relates to how to heat play asphalt pavement waste that was dug up by the road construction or the like.

  Asphalt pavement waste material (hereinafter referred to as “waste material”) is reused by being heated to a predetermined temperature by a regeneration dryer. By the way, when waste materials are heated with a regenerative dryer, the asphalt component adhering to the waste materials increases the adhesiveness, and the waste materials gradually adhere to and remain on the scraping blades, and eventually the function of the scraping blades may be impaired. is there. For this reason, a cord-like body with a movable member attached to the tip is attached to the inner peripheral surface of the drum, and when the drum rotates, the movable member is displaced to scrape the scraping blade to remove deposits on the surface of the scraping blade. (See Patent Document 1), curving the base of the plate-like scraping blade and attaching it to the drum inner peripheral surface, so that the waste material adheres to the connecting portion between the scraping blade and the drum so that the waste material flows smoothly (Refer to Patent Document 2) or mounting with a gap between the scraping blade and the drum inner peripheral wall, so that the waste material is not adhered and held at the connection point between the scraping blade and the drum inner peripheral wall ( Patent Document 3), various measures are taken to prevent the adhesion of waste materials.

Utility Model Registration No. 2500587 Japanese Patent Laid-Open No. 11-131418 JP 2002-227118 A

  However, as described above, although various measures are taken to prevent the waste material from adhering inside the drum of the regenerative dryer, there is more or less a phenomenon in which the waste material adheres and remains on the drum inner surface, and there is always a method of reducing the adhesion as much as possible. It is requested.

SUMMARY OF THE INVENTION In view of the above problems, and an object thereof is to provide a thermal regeneration how the asphalt pavement waste which is adapted waste drum inner surface of the reproduction dryer to minimize the adhesion.

  In order to solve the above problems, the present inventor has paid attention to the fact that the waste fine particles having a finer particle size and a higher asphalt content are more likely to adhere to the drum inner surface of the recycled dryer than the coarse waste particles. The present invention has been made. That is, the method for heating and regenerating asphalt pavement waste according to claim 1 is provided with a burner at one end of a regenerative dryer that is rotatably supported by tilting, and the waste material is supplied to the regenerated dryer at one end of the regenerative dryer on the burner side. A first supply means is provided, and a second supply means for supplying the waste material to the substantially central portion of the regenerated dryer is disposed at a substantially central portion of the regenerated dryer so that the coarse fraction of the waste material having a low asphalt content can be obtained. While supplying from the one end part of the regenerated dryer from the first supply means, the waste material fine grain content with a high asphalt content is supplied to the substantially central part of the regenerated dryer from the second supply means, and the asphalt in the waste material coarse particle content By supplying the waste material fine particles to the place where the stickiness has been increased by heating, the waste material fine particles are attached to the waste material coarse particles to increase the adhesion, thereby suppressing the adhesion of the waste material fine particles to the drum inner surface of the recycled dryer Shi It is characterized in that the reluctant thermal regeneration.

  Further, in the method for heating and regenerating asphalt pavement waste according to claim 2, the waste material coarse particles supplied to one end of the regenerated dryer by the first supply means are over 5 mm in particle size, and the second supply means The waste material fine particles supplied to the substantially central portion of the recycled dryer are characterized by being under 5 mm in particle size.

  According to the method for heating and regenerating asphalt pavement waste according to claim 1 of the present invention, a burner is provided at one end of a regenerative dryer that is rotatably supported in an inclined manner, and the reclaimed material is regenerated at one end of the regenerated dryer on the burner side. A first supply means for supplying to the dryer is disposed, and a second supply means for supplying the waste material to the substantially central portion of the regenerated dryer is disposed at a substantially central portion of the regenerated dryer so that the waste material rough having a low asphalt content is disposed. While supplying the grain fraction from one end of the regenerated dryer from the first supply means, the fine waste material fraction having a high asphalt content is supplied from the second supply means to the substantially central portion of the regenerated dryer, By supplying the waste fine particles to the place where the asphalt content in the portion has increased the adhesiveness by heating, the waste fine particles are attached to the waste coarse particles and increased to adhere to the recycled dryer inner surface Suppress Heating since the reproduced while can minimize the waste adhering to the inner surface of the drum of the reproduction dryer.

  Further, according to the method for heating and regenerating asphalt pavement waste material according to claim 2, the waste material coarse particles to be supplied to one end of the regenerated dryer by the first supply means are over 5 mm in diameter, and the second supply Since the waste fine particles supplied to the approximate center of the regenerated dryer by the means are under 5 mm in diameter, 5 mm particles that have high asphalt content and easily adhere to the waste coarse particles whose adhesion has been increased by heating. By mixing the waste material fine particles having an under diameter, the waste material fine particles can be adhered and increased to the waste material coarse particles, thereby reducing the adhesion of the waste material to the drum inner surface of the recycled dryer as much as possible.

It is a schematic explanatory drawing which shows one Example of the apparatus which implements the heating regeneration method of the asphalt pavement waste material which concerns on this invention.

In the method for heating and regenerating asphalt pavement waste material according to the present invention, a burner is provided at one end of a reclaimed dryer that is rotatably supported by tilting, and the waste material cut out from a waste material hopper is reclaimed at one end of the reclaimed dryer on the burner side. A first supply means including a belt conveyor for supplying to the dryer is disposed. In addition, a second supply means including a belt conveyor or the like for supplying waste material cut out from the waste material hopper to the substantially central portion of the regenerative dryer is disposed at a substantially central portion of the regenerative dryer. The waste materials supplied from the first and second supply means are configured to join at a substantially central portion of the regeneration dryer and be discharged from the other end portion of the regeneration dryer.

  When the waste material is heated by the regenerative dryer, a predetermined amount of waste material coarse particles having a small asphalt content, preferably over 5 mm in diameter, are supplied from one end of the regenerated dryer by the first supply means. Preferably, a predetermined amount of waste fine particles having a large asphalt content under 5 mm particle size is supplied from the second supply means from substantially the center of the regenerated dryer.

  The coarse fraction of the waste material supplied to the regenerated dryer increases the adhesiveness of the asphalt contained during rolling down while being heated in the regenerated dryer, and reaches the substantially central portion of the regenerated dryer. On the other hand, the waste fine particles are supplied to the center of the recycle dryer, and are combined with the coarse particles of the high-stickiness waste material to roll while adhering to the highly-adhesive waste coarse particles. It flows down and is heated to a predetermined temperature and discharged.

  In this way, by adhering and increasing the amount of fine waste material that has a high asphalt content and easily adheres to the inner surface of the drum of the recycled dryer, the amount of fine particles of the waste material that adhere to the inner surface of the drum of the recycled dryer is increased. It is possible to suppress the waste material from adhering to the drum inner surface of the regenerative dryer. Also, by supplying the waste material fine particles to the approximate center of the regenerative dryer where the hot air temperature is lowered, the waste material fine particles are not exposed to high temperatures, so that the waste material fine particles with a small heat capacity, especially the waste material fine particles (0.6 mm Under) is not heated excessively, and thermal degradation of asphalt can be suppressed.

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

  In the figure, reference numeral 1 denotes a regeneration dryer which is an apparatus for heating and regenerating waste material, and is composed of a first drum 2 and a second drum 3 arranged in series, and the discharge side of the first drum 2 is connected to the second drum 2. The waste material that has been inserted into the drum 3 and passed through the first drum 2 is supplied to the second drum 3.

  The first drum 2 and the second drum 3 are provided with a large number of scraping blades (not shown) on the inner periphery thereof, and are rotatably supported on the machine bases 4 and 5 so as to be separated from each other. Is rotated at a predetermined speed. A burner 8 is disposed on the charging hopper 6 side at one end of the regenerative dryer 1 via a combustion chamber 7. A flame is formed in the combustion chamber 7 by the burner 8, and the first drum 2, While the hot air is sent to the drum 3, the exhaust gas is sucked by the exhaust fan (not shown) at the end of the exhaust flue 10 connected to the discharge hopper 9 at the other end, thereby the inside of the first drum 2 and the second drum 3. Maintaining a hot gas flow through.

  Reference numeral 11 denotes a waste material hopper for storing waste materials, particularly waste material coarse particles having a relatively large particle diameter. The waste material coarse particles stored in the waste material hopper 11 by the belt conveyor 12 serving as the first supply means are supplied from the input hopper 6. One drum 2 is supplied. Reference numeral 13 denotes a waste material hopper for storing waste material, particularly waste material fine particles having a small particle diameter. The second drum 3 stores waste material fine particles stored in the waste material hopper 13 by a belt conveyor 14 as a second supply means. I am trying to supply it inside.

  When the waste material is heated and regenerated by the regenerative dryer 1 having the above-described configuration, first, coarse particles having a small asphalt content in the waste material, for example, a waste material having a particle diameter over about 5 mm, is stored in the waste material hopper 11, while the asphalt content is reduced. A large amount of fine particles, for example, waste material having a particle diameter under about 5 mm, is stored in the waste material hopper 13.

  Then, while sending hot air from the burner 8, the waste material coarse particles are cut out by a predetermined amount from the waste material hopper 11 and supplied into the first drum 2 via the belt conveyor 12. The supplied coarse fraction of waste material is heated in contact with hot air while rolling down in the first drum 2, and the adhesiveness of the asphalt content in the waste material is increased, so that the recycle dryer 1 has a substantially central portion. And supplied to the second drum 3.

  On the other hand, from the waste material hopper 13, a predetermined amount of the fine material of the waste material is cut out by a predetermined amount and supplied into the second drum 3 via the belt conveyor 14 to be combined with the coarse material of the waste material. The combined waste material fine particles adhere to the highly sticky waste material coarse particles and roll down while increasing in size, heated to a predetermined temperature and discharged to the discharge hopper 9.

  In this way, since the waste material fine particles are heated and regenerated while adhering and increasing the amount of the waste material coarse particles to the highly sticky waste material coarse particles, it is possible to suppress the waste material fine particles having a large amount of asphalt from adhering to the drum inner surface of the regenerated dryer 1. Therefore, it is possible to minimize the adhesion of the waste material to the drum inner surface of the regenerative dryer 1. Further, by supplying the waste material fine particles to the region where the hot air temperature is lowered, the waste material fine particles, particularly the waste material fine particles, are not excessively heated, and thermal degradation of the asphalt can be suppressed.

  In this embodiment, two drums, the first drum 2 and the second drum 3, are used. However, as a reproduction dryer having a single drum with a supply port for fine waste particles in the center of the drum. Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Reproduction dryer 2 ... 1st drum 3 ... 2nd drum 6 ... Input hopper 7 ... Combustion chamber 8 ... Burner 9 ... Discharge hopper 11, 13 ... Waste material hopper 12 ... Belt conveyor (1st supply means)
14 ... belt conveyor (second supply means)

Claims (2)

  A burner is provided at one end of the regenerative dryer that is supported in a tilted manner, and a first supply means for supplying waste material to the regenerative dryer is disposed at one end of the regenerative dryer on the burner side, and the regenerative dryer is substantially at the center. The part is provided with a second supply means for supplying the waste material to the substantially central portion of the regenerated dryer, and the coarse fraction of waste material having a small asphalt content is supplied from one end of the regenerated dryer from the first supply means, The waste material fines with a high content of asphalt are supplied from the second supply means to the approximate center of the regenerated dryer, and the asphalt content in the waste coarse particles is heated to increase the adhesiveness. The supply of asphalt pavement waste material is characterized by the fact that the fine particles of the waste material adhere to the coarse particles of the waste material and the heat regenerates while suppressing the adhesion of the fine particles of the waste material to the drum inner surface of the recycled dryer. Playback method.   The waste material coarse particles supplied to one end of the regenerated dryer by the first supply means have a particle diameter over 5 mm, and the waste fine particles supplied to the substantially central portion of the regenerated dryer by the second supply means are 5 mm. 2. The method for heating and regenerating asphalt pavement waste material according to claim 1, wherein the particle size is under the particle size.

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