JPH0959913A - Asphalt-containing material manufacturing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a malodor contained in exhaust gas discharged from a smokestack when waste materials are heat-reclaimed. SOLUTION: A return gas duct 16 which returns exhaust gas is connected to a smokestack 15 downstream from a drier 1 which heat-renovates waste materials and the other end of the return gas duct 16 is connected to the burner side 7 of the drier 1. An exhaust gas suction fan 24 is arranged halfway in the return gas duct 16 to suck the exhaust gas from the smokestack 15 and delivers to the burner side 7, and exhaust gas extracted from the smokestack 15 is exposed to the flames of the burner 7 and high-temperature gas for combustion of an odor component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt composite material manufacturing apparatus capable of heating and regenerating asphalt pavement waste generated by road construction or the like.

[0002]

2. Description of the Related Art Waste asphalt pavement material (hereinafter referred to as "waste material") dug up by road construction and the like is heated and regenerated by a dryer that is an aggregate heating device, and is effectively used after being mixed with a new mixture material.

[0003]

However, since the waste material has asphalt content coated on the surface, if the waste material is heated more than necessary, the volatile components in the asphalt will burn and produce a bad odor. There is also a need to consider measures against offensive odors from the viewpoint of environmental protection, as they may be diffused further into the surrounding area.

In view of the above points, it is an object of the present invention to provide an asphalt mixture manufacturing apparatus capable of reducing the amount of malodor emitted from a chimney when heating waste materials.

[0005]

In order to achieve the above object, the present invention is directed to an asphalt mixture manufacturing apparatus according to claim 1 in which an exhaust gas chimney disposed downstream of a dryer for heating and regenerating waste materials. A return flue that returns the exhaust gas is connected to the burner, the other end of the return flue is connected to the burner side of the dryer, and a fan that sucks the exhaust gas from the chimney is disposed in the middle of the return flue. It has a feature.

Further, the apparatus for producing an asphalt mixture according to a second aspect is characterized in that the return flue is connected to the combustion air intake of the burner.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION According to the asphalt mixture manufacturing apparatus according to claim 1 of the present invention, when the exhaust gas containing the odorous components generated by the waste material heating in the dryer is discharged from the stack, it is connected to the stack. A part of the exhaust gas discharged from the return flue is sucked by a fan and sent to the burner side of the dryer. Exhaust gas containing odorous components sent to the burner side is exposed to the flame of the burner and high temperature gas, and the odorous components in the exhaust gas are burned and deodorized. Thus, by collecting a part of the exhaust gas discharged from the chimney and burning the odorous components in the gas, the amount of malodor emitted into the atmosphere can be reduced as much as possible.

Further, according to the asphalt mixture manufacturing apparatus according to the second aspect of the present invention, a part of the exhaust gas discharged from the return flue connected to the chimney is sucked by the fan and the burner combustion air intake port of the dryer. The odor component in the exhaust gas is burned while being sent to and used as the combustion air. By connecting the return flue to the burner combustion air intake in this way, the combustion air intake of the burner is not opened to the outside, and noise reduction can be expected. Exhaust gas of a certain degree can be used, and improvement of combustion efficiency can be expected.

[0009]

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

Reference numeral 1 in the figure is a dryer for heating and recycling waste material, and a cylindrical drum 3 having a large number of scraping blades 2 provided therein is rotatably supported on a machine base 4 for driving. It is driven to rotate by the motor 5.

Reference numeral 6 denotes a hot hopper disposed at one end of the drum 3, a burner 7 is disposed on the hot hopper 6 side, and a combustion chamber 8 forming a flame in front of the burner 7.
Further, the hot hopper 6 is provided with a belt conveyor 9 for supplying waste material to the drum 3.

Reference numeral 10 denotes a cold hopper arranged at the other end of the drum 3, and the cold hopper 10 includes the drum 3
An exhaust flue 11 for leading out the exhaust gas is connected. The exhaust flue 11 is provided with a dry cyclone 12 that collects coarse particles and a bag filter 13 that collects fine particles of dust contained in the exhaust gas discharged from the drum 3, and a bag filter 13 is provided downstream thereof. A chimney 15 for arranging an exhaust fan 14 for sucking the exhaust gas and for discharging the exhaust gas sucked by the exhaust fan 14 to the atmosphere
Is arranged.

The chimney 15 is connected to a return flue 16 for returning a part of the exhaust gas discharged to the atmosphere to the dryer side,
The other end of the return flue 16 is connected to the burner 7.

Although various burners are adopted as the burner 7, an axial flow burner is shown in FIG. 2 as an example. The axial flow burner opens a fuel injection port 18 for injecting fuel into the front part of the cylindrical main body 17 to form a flame, and a fuel injection nozzle 19 is arranged in the fuel injection port 18 and a flame is formed. At times, a flame holding plate 20 for properly maintaining the shape of the flame is provided.

Further, an air intake port 21 for taking in combustion air is opened in the rear portion of the cylindrical main body 17, and a damper 22 for adjusting the flow rate of air is arranged in the air intake port 21 and the cylindrical main body is An axial blower 23 that sucks combustion air from an air intake port 21 and sends the combustion air toward the fuel injection port 18 is provided inside the air intake port 17. FIG. 1 shows a state in which the return flue 16 is connected to the air intake 21 of the axial burner.

The return flue 16 is connected to the combustion chamber 8 or a position near the burner side of the hot hopper 6 or the like, and the exhaust gas is brought into contact with the flame of the burner 7 or the high temperature gas to emit an odor. You may make it burn a component.

Reference numeral 24 is a fan disposed in the middle of the return flue 16 for sucking a part of the exhaust gas discharged from the chimney 15 and sending it to the burner 7. The adjustment of the gas suction amount is a return. This is performed by controlling the opening / closing degree of the damper in the flue 16 or controlling the number of revolutions by the fan inverter. An axial fan may be adopted as the fan 24 and housed in the return flue 16 to reduce noise.

When the waste material is heated and regenerated, however, the waste material is supplied into the drum 3 by the belt conveyor 9, and the waste material is heated to a desired temperature while the waste material rolls down in the drum 3. At this time, the dust and the exhaust gas accompanied with the malodorous components generated in the drum 3 are led to the exhaust flue 11, and the dry cyclone 12 first removes the coarse particles of the dust and the bag filter 1
The fine particles of dust are removed by 3 and are emitted from the chimney 15.

At this time, a part of the exhaust gas containing the odor component is sucked by the fan 24 of the return flue 16 and sent to the burner 7 side of the dryer 1. And the odorous components in the exhaust gas are exposed to the flame of the burner 7 and high temperature gas and burned,
It is decomposed into carbon dioxide and water and deodorized. By collecting a part of the exhaust gas discharged from the chimney and performing the deodorizing process in this way, the amount of malodor emitted from the chimney into the atmosphere can be reduced as much as possible.

When the exhaust gas sucked by the fan 24 is sent to the combustion air intake port 21 of the burner 7 and the exhaust gas containing the odor component is used as the combustion air, the burner 7 is removed in addition to the combustion removal of the odor component. The combustion air intake 21 is not opened to the outside, so that noise reduction can be expected, and further, exhaust gas at about 100 ° C. can be used as combustion air, and improvement in combustion efficiency can be expected.

Further, in the embodiment of the present invention, the exhaust gas containing the odorous component is fed to the burner 7 side of the dryer 1 for heating the waste material, but since the dryer for heating the new material is provided side by side. If necessary, exhaust gas containing odorous components may be sent to the burner side of the new material heating dryer, or odorous components may be sent to the burner side of both the waste material heating and new material heating dryers. You may make it send in the exhaust gas containing.

[0022]

As described above, in the asphalt mixture manufacturing apparatus according to the first aspect of the present invention, the return flue for returning the exhaust gas to the chimney 15 arranged downstream of the dryer 1 for heating and regenerating the waste material. 16 is connected, the other end of the return flue 16 is connected to the burner 7 side of the dryer 1, and a fan 24 for sucking exhaust gas is arranged in the middle of the return flue 16, so that the exhaust is emitted from the chimney 15. The odorous components in the exhaust gas can be burned to deodorize, and the amount of malodor emitted from the chimney into the atmosphere when the waste material is heated can be reduced.

Further, in the asphalt mixture manufacturing apparatus according to the second aspect of the present invention, since the return flue 16 is connected to the combustion air intake 21 of the burner 7, the odorous components are deodorized. In addition to the treatment, the combustion air intake of the burner 7 will not be opened to the outside, which can be expected to reduce noise, and the exhaust gas at about 100 ° C can be used as combustion air to improve combustion efficiency. it can.

[Brief description of drawings]

FIG. 1 is a schematic vertical explanatory view showing a part of an embodiment of an asphalt mixture manufacturing apparatus of the present invention.

FIG. 2 is a vertical cross sectional view showing an example of a burner.

[Explanation of symbols]

1 ... Dryer 7 ... Burner 16 ... Return flue 21 ... Combustion air intake 24 ... Axial fan

Claims (2)

[Claims] 1. A return flue for returning exhaust gas is connected to a chimney for exhaust gas emission, which is arranged downstream of a dryer for heating and regenerating waste material, and the other end of the return flue is connected to the burner side of the dryer. A device for manufacturing an asphalt mixture, which is connected with a fan for sucking exhaust gas from a chimney in the middle of the return flue. 2. The asphalt mixture manufacturing apparatus according to claim 1, wherein the return flue is connected to a combustion air intake of a burner.