JPH07107249B2 - Asphalt pavement waste material recycling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for reclaiming asphalt pavement waste generated by replacement of existing asphalt pavement, repair, and construction of equipment buried under the existing asphalt pavement. It is about.

[Prior Art] Waste asphalt pavement material (hereinafter referred to as "waste material") dug up by road construction and the like has been heated and regenerated by a dryer, which is a heating device, and has been used effectively.

[Problems to be Solved by the Invention] However, when a waste material containing an asphalt component is heated, a bad odor may be generated and the bad odor may be diffused to the neighborhood. Therefore, it is necessary to take measures against the bad odor from the viewpoint of circulation conservation. It has become to.

Therefore, in view of the above points, the present invention has an object of proposing an asphalt pavement waste material recycling apparatus capable of deodorizing at low cost without using a large deodorizing apparatus.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a burner equipped with a combustion chamber on the hot hopper side at one end of a drum that heats and regenerates waste asphalt paving material An exhaust fan is interposed in the middle of the circulation flue connected to the cold hopper side of the end, and the end of the circulation flue is connected to the combustion chamber, and part of the gas in the drum is discharged to the outside in the hot hopper. A discharge flue is provided, and further, the circulation flue and the discharge flue are crossed, and a heat exchanger for heating the exhaust gas in the circulation flue by the high temperature gas of the discharge flue is arranged at the intersection. It is a feature.

The discharge flue is connected to the burner side of the dryer that heats the new aggregate.

[Operation] In the asphalt pavement waste material recycling apparatus according to the present invention, all the exhaust gas discharged from the cold hopper side of the drum is returned to the combustion chamber arranged on the hot hopper side, and the exhaust gas is burned in the combustion chamber. It decomposes into carbon dioxide and water vapor and odorless treatment is performed. Then, the high-temperature exhaust gas reheated in the combustion chamber is sent again into the drum to heat the waste material in the drum. At this time, of the total amount of gas in the drum, the amount of gas that gradually increases due to the combustion air taken in from the burner, the air that enters from the gap between the drums, and the steam generated from the heating waste material is from the discharge flue that is installed in the hot hopper. It is released.

The exhaust gas discharged from the discharge flue has a temperature of about 800 ° C., and its heat is recovered by heating the exhaust gas in the circulation flue with a heat exchanger, and also, of the known asphalt plant attached. It can be collected by sending it to the hot hopper side of the dryer for heating the new aggregate.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a dryer for heating and regenerating waste material, and a machine drum 4 having a cylindrical drum 3 in which a large number of scraping blades 2 are provided inside.
It is rotatably supported on the upper side and is rotated at a predetermined speed by a driving device (not shown). Reference numeral 5 denotes a hot hopper arranged at one end of the drum 3, a burner 6 is arranged on the hot hopper 5 side, and a combustion chamber 7 for forming a flame is provided in front of the burner 6. . Reference numeral 8 denotes a cold hopper arranged at the other end of the drum 3, and a circulation flue 9 for leading out the exhaust gas of the drum 3 is connected to the cold hopper 8, and in the middle of the circulation flue 9. An exhauster 10 for sucking and exhausting the exhaust gas discharged from the drum 3 and a dust collector 11 for collecting the scattered dust in the exhaust gas are provided. The other end of the circulation flue 9 is connected to the combustion chamber 7, and the exhaust gas discharged from the drum 3 is guided to the combustion chamber 7. 12 is a blower
A damper for adjusting the amount of air, which is arranged in the circulation flue 9 on the suction side of 10, and the damper 12 for adjusting the amount of air is set to a temperature in the combustion chamber 7 detected by a temperature sensor 13 inserted at an appropriate position in the combustion chamber 7. In response, the temperature inside the combustion chamber 7 is about 800.
The suction amount of the exhaust gas is controlled so that the temperature becomes approximately ° C.

Reference numeral 14 denotes a discharge flue connected to the hot hopper 5. The discharge flue 14 is the combustion air taken in by the burner 6, the air invading from each seal portion of the dryer 1 and the steam generated from the heating waste material in the drum 3. The surplus gas that is gradually increased is discharged to the outside of the drum 3, and the surplus gas is discharged to the outside by natural ventilation due to the positive pressure in the drum. An exhaust fan may be provided in the discharge flue to forcibly exhaust the air.

The gas discharged from the discharge flue 14 has a high temperature, and a heat exchanger 15 is disposed between the discharge flue 14 and the circulation flue 9 in order to effectively use this high temperature gas, and the exhaust flue The temperature of the gas on the side of the circulation flue 9 is raised by the high-temperature gas on the side of 14 and is sent to the combustion chamber 7 to recover heat.

Then, when the waste material is heated and regenerated by the dryer 1, the waste material is supplied into the drum 3 by the belt conveyor 16 and the waste material is heated to a desired temperature while the waste material rolls down in the drum 3. At this time, it is sucked and exhausted by the exhaust gas exhauster 10 accompanied by the odor, blue smoke and dust generated in the drum 3, and the dust is removed by the dust collector 11 provided in the middle of the circulation flue 9 and returned to the combustion chamber 7. Combustion chamber 7
The exhaust gas that has been reduced to a high temperature is heated to a high temperature by the flame of the burner 6, and the odorous components and blue smoke in the exhaust gas are thermally decomposed and become odorless. The deodorized high-temperature exhaust gas is sent again into the drum 3 and reused for heating the waste material. Due to the exhaust gas circulation, the amount of air required for combustion of the burner 6, the amount of air entering from the respective seal portions of the drum 3 and the amount of water vapor generated by the heating of the waste material corresponding to the amount of water vapor become excess gas and gradually increase. However, these surplus gases are discharged from the discharge flue 14 to the outside by the positive pressure of the hot hopper 5. Since all the exhaust gas is circulated in this way, it is preferable to burn the burner with a minimum required amount of air when burning the burner.

In addition, in order to effectively use the high temperature gas discharged from the discharge flue 14, the heat exchanger 15 is arranged to heat the exhaust gas in the circulation flue 9 to recover the heat. The high-temperature gas to be discharged may be sent to the hot hopper side of the dryer for heating a new aggregate of a known asphalt plant, which is also installed without passing through the heat exchanger 15. In this case about 80
Since hot air of about 0 ° C is sent to the dryer for heating the new aggregate, it can be effectively used for heating the new aggregate.

[Effects of the Invention] As described above, according to the asphalt waste material recycling apparatus of the present invention, the total amount of the exhaust gas discharged from the drum 3 is reduced to the combustion chamber 7 and reheated, and the odorous components and blue smoke contained in the exhaust gas are discharged. It can be decomposed by heating to make it odorless, and it can completely prevent odor and harm in the surrounding environment.

Also, the high-temperature gas discharged from the discharge flue 14 is recovered via the heat exchanger 15, or is supplied to the hot hopper side of the dryer of the known asphalt plant to heat the new aggregate, thereby exhausting heat. It can be used effectively and is economical.

[Brief description of drawings]

FIG. 1 is a partially longitudinal schematic explanatory view of an embodiment of an asphalt pavement waste material recycling apparatus according to the present invention. 1 ... dryer, 3 ... drum, 5 ... hot hopper,
6 ... Burner, 7 ... Combustion chamber, 8 ... Cold hopper,
9: Circulating flue, 10: Exhaust fan, 11: Dust collector, 14 ...
Exhaust flue, 15 ... Heat exchanger

Claims (2)

[Claims] 1. A burner equipped with a combustion chamber is disposed on the hot hopper side at one end of a drum for heating and regenerating waste asphalt pavement, while a burner flue connected to the cold hopper side at the other end of the drum is provided in the middle of the circulation flue. An exhaust fan is interposed and the end of the circulation flue is connected to the combustion chamber, and the hot hopper is provided with a discharge flue that discharges a part of the gas in the drum to the outside. An asphalt pavement waste material reclamation apparatus, characterized in that a heat exchanger for intersecting the flue and for heating the exhaust gas in the circulation flue by the hot gas of the discharge flue is disposed at the intersection. 2. A burner provided with a combustion chamber is provided on one side of a drum for heating and regenerating waste asphalt pavement material on the hot hopper side, and on the other hand, in the middle of a circulation flue connected to the cold hopper side of the other end of the drum. An exhaust fan is interposed and the end of the circulation flue is connected to the combustion chamber, and the hot hopper is provided with a discharge flue that discharges a part of the gas in the drum to the outside. An asphalt pavement waste recycling device, which is connected to the burner side of a dryer that heats aggregate.