JPH10121409A - Asphalt plied material manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the recycle of the waste material with heating separately from other material by improving an asphalt plied material manufacturing device, which combines a new material drier and a waste material drier for deodorization and while which heats a new frame material and the waste material at the same time. SOLUTION: An asphalt plied material manufacturing device is provide with a new material drier 1 and a waste material drier 14, and the new material drier 1 is provided with a combustion chamber 5 for deodorization so that the hot air, which is generated in the combustion chamber 5, is flowed to the waste material drier 14. Exhaust gas of the waste material drier 14 is returned to the combustion chamber 5 for deodorization, and while the exhaust gas is made to bypass the combustion chamber 5 through a bypass duct 27 so as to be directly led out to a bag filter 11. At the time of heating the only waste material, a flow passage opening and closing damper 29, which is arranged near an inlet of the new material drier 1, is closed so that the hot air at a high temperature passes through the new material drier 1 and that the hot air is not directly flowed to the bag filter 11, and all of the hot air at a high temperature is led out to the waste material drier 14, and the exhaust gas is led out to the bypass duct 27, and flowed to the bag filter 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing asphalt mixture as road pavement waste, and more particularly, to an asphalt mixture in which a new dryer for heating new aggregate and a waste dryer for heating waste are provided. Related to the device.

[0002]

2. Description of the Related Art Asphalt pavement waste material (hereinafter referred to as "waste material") excavated by road construction or the like is being regenerated by heating and reused as asphalt mixture. However, when the waste material containing asphalt is heated, depending on the heating conditions, an odorous exhaust gas is generated, causing an odor in the vicinity of the plant and causing a problem that cannot be ignored in terms of pollution.

[0003] The present applicant has disclosed in Japanese Patent Application Laid-Open No. 5-39605.
As described in the publication, a waste material dryer is provided along with a new material dryer, a combustion chamber also serving as a deodorizing furnace is provided in the new material dryer, and a hot air outlet duct is connected to the downstream side of the combustion chamber. An asphalt mixture manufacturing apparatus has been proposed in which an end of an outlet duct is connected to a material supply side of the waste material dryer, and an end of an exhaust duct of the waste material dryer is connected to an upstream side of the combustion chamber.

In this apparatus, when new aggregate is heated by a new material dryer, hot air generated in a combustion chamber of the new material dryer is led out to a waste material dryer, and the waste material is heated and regenerated by the hot air. . Then, the exhaust gas containing the malodorous component generated when the waste material is heated and regenerated is returned from the waste material dryer to the combustion chamber of the new material dryer, and the malodor component in the exhaust gas is burned and deodorized in the combustion chamber. .

[0005]

However, when only the waste material is to be heated and regenerated alone in the above asphalt mixture production apparatus, a part of the hot air generated in the combustion chamber of the new material dryer is removed. Most of the hot air passes through the new-material dryer and flows downstream of the new-material dryer without being used for heating the new aggregate, but the downstream bag filter is exposed to high temperatures and burns the filter cloth. This is an apparatus that cannot heat and regenerate only waste materials.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide an asphalt mixture manufacturing apparatus which can improve the conventional apparatus and can heat and regenerate only waste materials.

[0007]

In order to achieve the above object, the present invention provides a new material dryer for heating a new aggregate and a waste material dryer for heating a waste material. A burner for heating new material is provided through a combustion chamber having a length, and a new aggregate supply means is provided at the other end, and a hot air outlet duct is connected to the downstream side of the combustion chamber. The end is connected to the waste material supply side of one end of the waste material dryer, and an exhaust duct connected to the other end of the waste material dryer is connected to the upstream side of the combustion chamber of the new material dryer via an exhaust fan and a damper for air volume control. Further, a bypass duct is provided by branching an exhaust duct of the waste material dryer from just before the air flow adjusting damper, and an end of the bypass duct is connected to an exhaust gas flow path downstream of the combustion chamber, and a combustion chamber outlet is provided. From the Ipasudakuto is characterized in that is disposed a flow channel opening and closing the damper for controlling the flow of exhaust gas to a predetermined position of the exhaust gas flow path to the connection point.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the asphalt mixture production apparatus of the present invention, when waste material is heated alone, first, a damper for opening and closing a flow passage disposed in an exhaust gas flow passage downstream of a combustion chamber is closed to thereby heat the waste gas. To prevent the hot air from flowing to the new material dryer side, close the air volume adjustment damper located on the combustion chamber side of the exhaust duct of the waste material dryer, and bypass the exhaust gas derived from the waste material dryer without flowing to the combustion chamber. Let it flow to the duct side.

When the hot air is generated in the combustion chamber, the hot air does not flow out to the new material dryer downstream of the combustion chamber, but flows exclusively into the waste material dryer from the hot air outlet duct connected downstream of the combustion chamber. After the waste material is heated by the waste material dryer, the exhaust gas is led to the exhaust duct, but the combustion chamber side of the exhaust duct does not flow into the combustion chamber because it is closed by the air volume adjustment damper, and it is used for air volume adjustment. It flows to the side of the bypass duct that branches off before the damper. The exhaust gas passing through the bypass duct is guided to a bag filter and discharged into the atmosphere.

As described above, when the waste material is heated alone, all the hot air generated by the burner is caused to flow to the waste material dryer side, and the exhaust gas of the waste material dryer is caused to flow from the bypass duct to the bag filter. Hot air does not flow through the new material dryer and into the bag filter, preventing damage to the bag filter.

[0011]

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

Reference numeral 1 denotes a new material dryer of an asphalt plant for heating and drying new aggregate, and a rotatable and inclined support of a cylindrical drum 2 having a number of raised blades provided therein, and a driving device (see FIG. 1). (Not shown) at a predetermined speed. Reference numeral 3 denotes a burner provided on the hot hopper 4 side of the new material dryer 1, which forms a flame in the combustion chamber 5 and sends high-temperature gas into the drum 2, while supplying new aggregate provided on the cold hopper 6 side. The new aggregate is fed through the conveyor 7 as a means, and the new aggregate is heated to a predetermined temperature while being rolled down while being scraped up by the lifting blades, and is discharged from the discharge unit 8. An exhaust flue 9 serving as an exhaust gas passage is connected to the cold hopper 6 of the new material dryer 1, and an exhaust fan 10 for sucking exhaust gas, a bag filter 11 for removing dust in the exhaust gas, and an exhaust gas A chimney 12 is provided for discharging to

A deodorizing furnace 13 is provided in front of the combustion chamber 5. The deodorizing furnace 13 has a hot air passage that requires at least one second for hot air to pass in order to completely burn off malodorous components in exhaust gas. Is preferably ensured. Note that the combustion chamber 5 may be lengthened so as to be used also as the deodorizing furnace 13.

Reference numeral 14 denotes a waste material dryer for heating and regenerating the waste material, which has substantially the same structure as that of the new material dryer 1 described above. A hot hopper 16 is provided at one end and a cold hopper 17 is provided at the other end. The waste material is conveyed to a hot hopper 16 by a conveyor 18 as waste material supply means.
The waste material is heated to a predetermined temperature and discharged from the discharge unit 19 while being rolled down in the drum while being supplied from the side and being lifted up by a lifting blade.

In order to guide the hot air generated by the burner 3 to the waste material dryer 13, the deodorizing furnace 1 on the downstream side of the combustion chamber 5 is used.
3 and the hot hopper 16 of the waste material dryer 14 are connected by a hot air outlet duct 20. Also, waste material dryer 1
An exhaust duct 21 is connected to the cold hopper 17 of No. 4,
A cyclone dust collector 22 and a blower 23 are provided in the middle of the exhaust duct 21, and the other end is connected to the upstream side of the combustion chamber 5 of the new material dryer 1 via a damper 24 for adjusting the air flow.

Further, a circulation duct 25 is connected to the exhaust duct 21 by branching the downstream of the exhaust fan 23 as necessary.
An air flow control damper 26 is provided in the middle of the circulation duct 25, and the other end is connected to the hot air outlet duct 20 to circulate a part of the exhaust gas having a lowered temperature discharged from the waste material dryer 14 to derive hot air. The high-temperature hot air in the duct 20 is combined with the high-temperature hot air, and the hot air introduced into the waste material dryer 14 is appropriately adjusted to a temperature suitable for heating the waste material.

Further, the exhaust duct 21 is branched before the air volume adjusting damper 24 to connect the bypass duct 27, and the other end is connected to the exhaust flue 9 before the bag filter 11. At this time, the other end of the bypass duct 27 may be connected to the exhaust gas flow path in front of the bag filter 11, and in the above-described embodiment, the other end of the bypass duct 27 is connected to the exhaust flue 9.
As indicated by a dotted line, the hot air that has passed through the deodorizing furnace 13 may be connected to a hot air introduction duct 28 that sends the hot air to the new material dryer 1.

Reference numeral 29 denotes a flow path opening / closing damper provided in the hot air introduction duct 28, and reference numerals 30, 31, and 32 denote air flow control dampers provided in the exhaust flue 9, the hot air outlet duct 20 and the bypass duct 27, respectively. It is a damper.

When simultaneously heating the new aggregate and the waste material, the damper 29 for opening and closing the flow passage is opened and the damper 32 for adjusting the air volume is closed in advance. Then, the burner 3 is burned to form a flame in the combustion chamber 5, and hot air is sucked by a downstream exhaust 10 to remove the deodorizing furnace 13.
And maintain a hot gas flow passing through the drum 2. Then, the new aggregate is supplied into the drum 2 by the conveyor 7, and the aggregate is heated to a predetermined temperature. At this time, the combustion control of the burner 3 makes the temperature of the hot air in the deodorizing furnace 13 downstream of the combustion chamber 5 variable at a predetermined temperature, for example, in the range of 700 ° C to 1200 ° C.

Next, the exhaust fan 2 downstream of the waste material dryer 14
A part of the hot air generated in the combustion chamber 5 is sucked from the deodorizing furnace 13 through the hot air outlet duct 20 while the suction amount is adjusted by the air volume adjusting dampers 25 and 31 by driving the air conditioner 3 and guided into the waste material dryer 14. . Then, the waste material is supplied from the hot hopper 16 side of the waste material dryer 14 by the conveyor 18, and the waste material is heated to a predetermined temperature by the parallel flow heating method.

At this time, if the circulation duct 25 is provided, the temperature of the hot air introduced into the waste material dryer 14 is adjusted to a temperature suitable for heating the waste material by adjusting the gas circulation amount by the damper 26 for adjusting the air volume. I do.

The exhaust gas discharged from the waste material dryer 14 is sent into the combustion chamber 5 after dust is removed by the cyclone dust collector 22. As a result, the temperature in the combustion chamber 5 tends to fluctuate, but the amount of combustion in the burner 3 is adjusted to control the hot air temperature of the deodorizing furnace 13 to about 800 ° C.

The exhaust gas sent from the waste material dryer 14 into the combustion chamber 5 is exposed to a flame of about 1200 ° C.
By contacting with hot air of 800 ° C. or more while passing through the deodorizing furnace 13 for more than a second, the malodorous components contained in the exhaust gas are burned and decomposed and deodorized. Further, the high-temperature exhaust gas discharged from the waste material dryer 14 passes through the new material dryer 1, so that heat is recovered in the new material dryer 1 and effective use of heat can be achieved.

When the waste material is heated and regenerated alone by the waste material dryer 14, first, the damper 2 for opening and closing the flow path of the hot air introduction duct 28 provided at the entrance of the new material dryer 1 is used.
By operating 9, the exhaust gas flow path is closed so that hot air does not flow into the new material dryer 1. Further, the exhaust duct 21
Of the waste material dryer 14 by closing the air volume adjustment damper 24
Exhaust gas derived from the combustion chamber 5 is prevented from returning.

Next, the exhaust fan 2 downstream of the waste material dryer 14
3 is driven and all the hot air generated in the combustion chamber 5 is led out to the hot air outlet duct 20 while adjusting the gas amount by the dampers 25 and 31, introduced into the waste material dryer 14, and the exhaust gas led out from the waste material dryer 14 is discharged. The air flows into the bypass duct 27 through the exhaust duct 21, passes through the bag filter 11, and is discharged from the chimney 12. During this time, the waste material is supplied to the waste material dryer 14 by the conveyor 18, heated to a desired temperature by hot air passing through the waste material dryer 14, and discharged from the discharge unit 19.

As described above, when only the waste material is heated and regenerated alone, all the high-temperature hot air generated by the burner 3 flows to the waste material dryer 14, and the exhaust gas from the waste material dryer 14 is also filtered from the bypass duct 27 through the bag filter 27. Since the hot air flows into the bag filter 11 without passing through the new material dryer 1, the filter cloth of the bag filter 11 can be prevented from being damaged. The exhaust gas discharged from the waste material dryer 14 is supplied to the deodorizing furnace 1.
3 is not deodorized because it does not pass through, but the time for heating only the waste material alone is extremely short.
Mist having an odor component can be removed even with 1 so that there is no problem.

In this embodiment, the hot air for heating the waste material is extracted from the deodorizing furnace 13 downstream of the combustion chamber 5.
The hot hopper 4 of the downstream part of the combustion chamber 5 and the new material dryer 1,
Alternatively, hot air may be extracted from the vicinity of the high-temperature portion of the drum 2. Further, in the embodiment, the exhaust duct 21 of the waste material dryer 14 is connected to the vicinity of the burner 3 on the upstream side of the combustion chamber 5, but it may be connected to the primary air intake of the burner 3 to use exhaust gas as primary air for combustion. good.

Further, in this embodiment, a part of the exhaust gas discharged from the waste material dryer 14 is circulated by the circulation duct 25 to adjust the temperature of the hot air introduced into the waste material dryer 14, but the circulation duct 25 is omitted. Then, high-temperature hot air may be introduced into the waste material dryer 14, or the temperature of the hot air may be adjusted as a structure for taking in outside air. Further, various changes can be made without departing from the gist of the present invention, such as providing an auxiliary burner on the hot hopper 16 side of the waste material dryer 14.

[0029]

As described above, according to the asphalt mixture manufacturing apparatus of the present invention, a new material dryer and a waste material dryer are provided side by side, and the new material dryer is provided with a combustion chamber and generated in the combustion chamber. A structure that supplies part of the hot air to the waste material dryer side and returns the exhaust gas that has passed through the waste material dryer to the combustion chamber again, while preventing the hot air derived from the combustion chamber from being led out to the new material dryer side. An opening / closing damper is placed near the entrance of the new material dryer, and the exhaust gas from the waste material dryer can be bypassed to the combustion chamber by a bypass duct to the bag filter side. The exhaust gas can be deodorized while simultaneously heating the waste material, and the waste material can be heated and regenerated alone without burning the filter cloth of the bag filter.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... New material dryer 3 ... Burner 5 ... Combustion chamber 7 ... New aggregate supply means 9 ... Exhaust flue 11 ... Bag filter 14 ... Waste material dryer 20 ... Hot air outlet duct 21 ... Exhaust duct 23 ... Exhaust air 24 ... Air volume adjustment Damper 25 ... Circulation duct 26 ... Damper for air volume adjustment 27 ... Bypass damper 28 ... Hot air introduction duct 29 ... Damper for opening and closing a flow path

Claims (1)

[Claims] 1. A new material dryer for heating new aggregate and a waste material dryer for heating waste material are provided side by side, and a burner for heating new material is provided at one end of the new material dryer via a combustion chamber of an appropriate length. A new aggregate supply means is provided at the other end, a hot air outlet duct is connected to the downstream side of the combustion chamber, and the other end of the hot air outlet duct is connected to a waste material supply side of one end of the waste material dryer, An exhaust duct connected to the other end of the waste material dryer is connected to an upstream side of the combustion chamber of the new material dryer via an exhaust fan and an air flow control damper, and the exhaust duct of the waste material dryer is further connected to the air flow control damper. A bypass duct is provided branching from the near side, and an end of the bypass duct is connected to an exhaust gas flow path downstream of the combustion chamber, and is discharged to a predetermined position of the exhaust gas flow path from the combustion chamber outlet to the bypass duct connection point. Moth Asphalt mixture manufacturing apparatus characterized by the flow channel opening and closing damper is disposed to control the flow of.