JP2006045845A - Drier for heating-drying regenerated asphalt aggregate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce sticking of a regenerated heated asphalt aggregate to a drum inner wall surface, while enhancing heat energy efficiency by using hot air by a heating burner of a drier for heating and drying a regenerated asphalt aggregate and radiation heat from an inner cylinder for covering its flame. <P>SOLUTION: The inner cylinder for covering the flame of the heating burner 3 of the drier 1 for heating and drying the regenerated asphalt aggregate rotatably supported in an inclined state, is installed in a drum 2, and the regenerated asphalt aggregate 5 is inputted from the upper side of an end part of the drum 2 attached with this heating burner 3, to heat and dry the regenerated asphalt aggregate 5 by a parallel flow heating method by the hot air and the radiation heat from the inner cylinder 6. A side surface part or an under surface part on the tip side of the inner cylinder 6 of the heating burner 3, is also put in an opening state, and the radiation heat is desirably radiated toward the inner wall surface of the drum 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a dryer for heating and drying reclaimed asphalt aggregates that are recycled by heating and drying recycled asphalt aggregates obtained by digging up, pulverizing and selecting asphalt pavement materials laid on a road.

It is possible to recycle recycled asphalt aggregate obtained by crushing asphalt pavement waste generated by replacement of asphalt pavement etc. with a crusher, sorting by particle size, drying in a dryer, and reusing it as a new asphalt mixture Generally done.

In this conventional reclaimed asphalt aggregate heat drying dryer, a combustion chamber is disposed outside one end of the drum, and hot hot air is supplied into the drum while forming a burner flame in the combustion chamber. The recycled asphalt aggregate supplied into the drum is heated and dried.

However, when the recycled asphalt aggregate is heated and the aggregate temperature reaches around 60 to 100 ° C., the asphalt component becomes sticky and adheres to and accumulates on the drum inner wall and blades near the drum inlet. If this adherence continues, the ability of the dryer will be hindered. Therefore, it is scraped off with an adhesion prevention chain or the like, and the adhering matter is removed by hand.

Therefore, as a result of conducting a prior patent search, a reclaimed asphalt aggregate was formed by inserting an inner cylinder at one end of a dry film as in JP-B-1-35121, forming a flame of a heating burner in the inner cylinder,
Some new aggregates are heated.

However, the above-mentioned Japanese Patent Publication No. 1-35211 is a dryer that heats both recycled asphalt aggregates and new aggregates. When the so-called co-current heating system is used, the exhaust gas becomes high temperature and energy loss occurs. Since it is large, a counter-current heating system that can reduce the temperature of the exhaust gas was adopted, and the regenerated asphalt aggregate was supplied to almost the middle part of the drum so as not to be overheated.
JP-B-1-35121

An object of the present invention is to increase the thermal energy efficiency by using hot air from a heating burner and radiant heat from an inner cylinder covering the flame, and to reduce the adhesion of regenerated heated asphalt aggregates to the inner wall surface of the drum.

In order to solve the above-described problems, the present invention has an inner cylinder that covers the flame of a heating burner of a regenerated asphalt aggregate heat drying dryer that is rotatably supported in an inclined state. Insert the recycled asphalt aggregate from the upper side of the end of the drum equipped with this heating burner, and install the recycled asphalt aggregate by hot air and the radiant heat from the inner cylinder of the heating burner. The present invention provides a dryer for heating and drying recycled asphalt aggregate, which is characterized by being heated and dried.

Further, the side or bottom surface portion on the front end side mounted in the drum of the inner cylinder of the heating burner is in an open state so that radiant heat is radiated from the opening toward the inner wall surface of the dryer drum. The present invention provides a dryer for heating and drying recycled asphalt aggregates.

Furthermore, the side or lower surface of the inner cylinder mounted in the drum of the heating burner is opened in an oblique state so that radiant heat is radiated from the opening toward the inner wall of the dryer drum. The present invention provides a dryer for heat drying dried asphalt aggregate.

In the present invention, the inner cylinder that covers the flame of the heating burner of the dryer for heating and drying the recycled asphalt aggregate that is rotatably supported in an inclined state is mounted in the drum of the dryer, thereby simplifying the structure of the dryer. Recycled asphalt aggregate can be heated and dried with increased energy efficiency.

Then, by putting recycled asphalt aggregate from the upper side of the end of the drum equipped with this heating burner, and heating and drying the recycled asphalt aggregate by the hot air and the radiant heat from the inner cylinder of the heating burner In addition, it is possible to reduce the adhesion and accumulation of regenerated heated asphalt aggregate that easily adheres to the inner peripheral wall in the vicinity of the aggregate of the drum, and to increase the heating efficiency of the dryer.

Also, the hot air and the drum of the heating burner are formed by radiating radiant heat from the opening to the inner wall surface of the drum with the side surface or the lower surface of the inner cylinder mounted in the drum of the heating burner opened. Radiant heat and radiant heat can be radiated from the periphery of the inner cylinder inserted in the inside to heat the regenerated asphalt aggregate and the inner wall surface of the drum, and the regenerated heated asphalt aggregate can be prevented from adhering and accumulating near the inlet of the dryer. .

Furthermore, by radiating radiant heat from the opening to the inner wall surface of the dryer drum by opening the side or lower surface portion on the tip side mounted in the drum of the inner cylinder of the heating burner, Radiant heat from the circumference of the inner cylinder of the heating burner and radiant heat is radiated toward the inner wall surface of the drum from the diagonally cut-out opening of the inner cylinder to effectively recycle the asphalt aggregate and the inner wall surface of the drum It is possible to reliably prevent the regenerated and heated asphalt aggregate from adhering to and depositing near the inlet of the dryer.

The reclaimed asphalt aggregate heat drying dryer of the present invention is mounted in the dryer drum with the inner cylinder covering the flame of the reheated asphalt aggregate heat drying dryer heated and supported in an inclined state. Recycled asphalt aggregate was introduced from the upper side of the end of the drum equipped with this heating burner, and the regenerated asphalt aggregate was heated and dried by a cocurrent flow method using hot air and radiant heat from the inner cylinder of the heating burner. It is characterized by.

As shown in FIG. 1, the dryer 1 supports a heat-resistant drum 2 having a predetermined diameter and a predetermined length so as to be slightly inclined and rotatable, and a heating burner 3 is disposed on an upper end side thereof, and the heating burner 3 The inner cylinder 6 is inserted into the drum 2 and mounted so as to cover the flame of the drum, and the recycled asphalt aggregate 5 is introduced from the aggregate inlet 4 on the upper side of the end of the drum 2, and is heated and dried. Regeneratively heated asphalt aggregate can be manufactured.

In particular, the inner cylinder 6 that covers the flame inserted into the drum 2 of the heating burner 3 is made of heat-resistant steel and has a diameter of about one half of the inner diameter of the drum 2 inside the drum 2 as shown in FIG. It is arranged so as to protrude from the end surface to about one fifth to one third of the drum length, and the recycled asphalt aggregate 5 fed from the aggregate inlet 4 is not directly touched by the flame. 2 is heated and dried by hot air passing through the inside of the heating cylinder 3 and the radiant heat from the inner circumferential surface of the inner cylinder 6 of the heating burner 3, particularly the lower circumferential surface, and the blade is fed to the inner wall of the drum 2 protruding from the inner cylinder 6. 7 is arranged in a single stage so that the recycled asphalt aggregate 5 is fed into the inside of the drum, and is scraped up by a scraping blade 9 disposed at the rear of the drum 2 and uniformly heated and dried with hot air while being dropped. It discharges from the rear outlet 8

In this way, the portion R where the regenerated asphalt aggregate is most likely to adhere to the drum 2 in the past, from the vicinity of the root of the inner cylinder 6 of the heating burner 3 to the front portion of the scraper blade 9 at the input portion of the regenerated asphalt aggregate 5. Is heated by the hot air in the dryer 1 and the radiant heat from the side surface of the inner cylinder 6 of the heating burner 3, particularly the lower peripheral surface, as described above, so that the recycled asphalt aggregate 5 becomes the drum 2.
Can be prevented and energy saving can be achieved.

Further, as described above, the scraping blade 9 is provided on the peripheral surface from the vicinity of the center of the drum 2 of the dryer 1 to the rear thereof, and the scraping blade 9 is cylindrical as shown in FIG. It is arranged in a state of being lifted about 50 to 100 mm from the wall surface, and even if it is touched with regenerated heated asphalt aggregate, it is difficult to slip and adhere.

3 and 4 are provided with an opening 10 in which the side surface or the lower surface of the front end side of the inner cylinder 6 covering the flame of the above-described heating burner 3 is notched so as to be as large as possible. The regenerated asphalt aggregate 5 is heated and dried more effectively by the radiant heat, the hot air, and the radiant heat. In addition, it is preferable to provide the opening part 10 in a side surface or a lower surface side so that the reproduction | regeneration asphalt aggregate 5 may not accumulate in the inner cylinder 6 like a figure.

1 and 2 show an embodiment of the present invention. A heating burner 3 made of heavy oil is attached to one end of a dryer 1450 having a diameter of 1450 mm and a length of 4500 mm, and a cylindrical steel inner cylinder 6 having a diameter of 700 mm. Is inserted into the drum 2 so as to protrude about 1000 mm, and recycled asphalt aggregate 5 is introduced from the aggregate inlet 4 provided at the upper end of the drum 2 so as to be heated and dried efficiently by a cocurrent heating method. Is.

When the recycled asphalt aggregate 5 is introduced from the aggregate inlet 4, the recycled asphalt aggregate 5 is fed into the drum through the feed blade 8 by the rotation of the drum 2, and hot air generated by heating of the heating burner 3, It is heated and dried by radiant heat from the cylinder 6.

Therefore, compared with the conventional heat exchange method using only hot air, heat absorption into the recycled asphalt aggregate can be accelerated, and it can be prevented from adhering to the wall surface of the drum, further improving energy efficiency, The residence time of the regenerated asphalt aggregate can be shortened to about 3 to 4 minutes, and the time to rise to an appropriate temperature can be shortened, and the length of the dryer can be shortened by about 20 to 30% as compared with the conventional type.

Further, the regenerated asphalt aggregate 5 heated and dried by the hot air and the radiant heat from the inner cylinder 6 as described above is sent to the rear as shown in FIG.
It falls and is heated and dried by hot air. At that time, the scraping blade 9 is cylindrical as shown in FIG. 2 and is slightly separated from the wall surface of the drum 2, so that the regenerated and heated asphalt aggregate is difficult to adhere, heat exchange is sufficiently performed, and moisture is eliminated. The

FIGS. 3 and 4 show another embodiment of the present invention. The side surface of the tip of the inner cylinder 6 of the heating burner 3 is cut obliquely to form an opening 10. Furthermore, the regenerated asphalt aggregate can be heated and dried by emitting radiant heat, and the energy efficiency can be further increased.

Side sectional view for explaining the main part of one embodiment of the present invention, Longitudinal sectional view of the upper part of the dryer, Plan sectional view for explaining the main part of another embodiment of the above, Side sectional view for explaining the main part of the above,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dryer 2 ... Drum 3 ... Heating burner 5 ... Recycled asphalt aggregate

6 ... Inner cylinder 7 ... Feeding blade 9 ... Raising blade 10 ... Opening

Claims (3)

An inner cylinder that covers the flame of the heating burner of the dryer for heating and drying the reclaimed asphalt aggregate that is rotatably supported as an inclined state is installed in the drum of the dryer, and from the upper side of the end of the drum equipped with this heating burner A dryer for heating and drying recycled asphalt aggregate, wherein the recycled asphalt aggregate is heated and dried by a co-current heating method using hot air and radiant heat from the inner cylinder of a heating burner. The side or bottom surface of the inner cylinder mounted in the drum of the heating burner is opened, and radiant heat is radiated from the opening toward the inner wall of the drum of the dryer. Item 2. A dryer for heat drying dried asphalt aggregates according to item 1. Radiation heat is radiated from the opening to the inner wall of the dryer drum, with the side or bottom of the inner cylinder mounted inside the drum of the heating burner being opened in an oblique manner. A dryer for heating and drying recycled asphalt aggregates according to claim 1 or 2.

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