JP4045136B2 - Method for producing asphalt mixture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing an asphalt mixture which is a road pavement material.
[0002]
[Prior art]
In the asphalt mixture manufacturing plant, new aggregate heating dryer (hereinafter referred to as “new material dryer”) that heats new aggregate (hereinafter referred to as “new material”) and asphalt pavement waste material (hereinafter referred to as “new material dryer”) that is excavated due to road construction etc. There are many places where both waste material heating dryers (hereinafter referred to as “waste material dryers”) for heating waste materials ”are installed.
[0003]
When the waste material is heated by the waste material dryer, malodorous components are contained in the exhaust gas, and a deodorizing furnace may be installed to burn and decompose the malodorous component. And since the exhaust gas derived from the deodorization furnace is still high temperature, a heat exchanger is installed to recover the heat stored in the exhaust gas, and the recovered heat is supplied as combustion air for the burner of the waste dryer to effectively use the heat. I am trying.
[0004]
[Problems to be solved by the invention]
However, the present inventor may recover the high-temperature gas discharged from the deodorization furnace with a heat exchanger for effective use, but there is another method that can effectively use the high-temperature gas from the deodorization furnace as it is. Thought.
[0005]
BACKGROUND OF THE INVENTION
This invention makes it a subject to provide the manufacturing method of the asphalt mixture which utilized effectively the retained heat of the high temperature gas derived | led-out from a deodorizing furnace in view of said point.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention includes a new material dryer for heating new material and a waste material dryer for heating waste material, while the exhaust gas derived from the waste material dryer is disposed downstream of the exhaust flue of the waste material dryer. A deodorizing furnace that disposes and decomposes malodorous odors in a high-temperature atmosphere is disposed, and the sand having a high water content is heated exclusively by the high-temperature gas derived from the deodorizing furnace downstream of the exhaust flue of the deodorizing furnace. A sand dryer to be dried is disposed, and an end of the exhaust flue of the sand dryer is derived from the exhaust flue of the waste dryer when the waste material is heated by the waste material dryer in the asphalt mixture manufacturing apparatus connected to the dust collector. After introducing the exhaust gas into the deodorization furnace and burning and decomposing malodorous components in the exhaust gas, the high-temperature gas derived from the deodorization furnace is guided to the sand dryer, and the sand is supplied to the sand dryer to contact the high-temperature gas. It was heated to a predetermined temperature by causing the heated sand stored in the sand storage bottle plant body side, and the sand in the sand storage bin at the time of manufacture of the asphalt mixture so as to produce a predetermined amount contaminating mixture It is characterized by that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the method for producing an asphalt mixture of the present invention, exhaust gas derived from a waste material dryer is introduced into a deodorization furnace, and exposed to a high-temperature atmosphere in the deodorization furnace to burn and decompose malodorous components in the exhaust gas. Then, the hot gas derived from the deodorizing furnace is introduced into the sand dryer, and the sand is heated to a predetermined temperature while contacting with the supplied sand. The heated sand is stored in a sand storage bottle disposed on the side of the plant main body having a storage, weighing, and mixing function, and is used after being mixed with a predetermined amount when manufacturing the asphalt mixture. On the other hand, the exhaust gas derived from the sand dryer is guided to the dust collector, and the dust in the exhaust gas is removed.
[0008]
As described above, the sand dryer is disposed downstream of the deodorization furnace, and the high temperature gas discharged from the deodorization furnace is introduced into the sand dryer to heat the sand which is one of the materials of the asphalt mixture. The retained heat of the high-temperature exhaust gas from the furnace can be used effectively.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
In the figure, reference numeral 1 denotes a waste material dryer for heating the waste material. The waste material dryer 1 is configured to freely rotate a cylindrical drum 2 having a large number of scraping blades (not shown) on its inner periphery on a machine base 3. The drum is rotated at a predetermined speed by a drive device (not shown), and a drum is formed while a flame is formed in the combustion chamber 6 by a burner 5 provided at one end of the drum 2 on the hot hopper 4 side. While maintaining the high-temperature gas flow passing through the drum 2 by sucking the exhaust gas by the exhaust fan 9 disposed in the exhaust flue 8 of the storage bin 7 having the inertia dust collecting mechanism at the other end. is doing.
[0011]
Then, the waste material is fed into the drum 2 by the belt conveyor 10 and brought into contact with the high temperature gas flow while rolling down the drum 2 while scraping the waste material with the scraping blades, and the waste material is heated to a desired temperature and stored. Drain into bin 7. The heated waste material stored in the storage bin 7 is supplied in a predetermined amount to a mixer (not shown) of the plant body, and mixed with the new material at a predetermined ratio to produce an asphalt mixture having a desired composition.
[0012]
A deodorizing furnace 11 is disposed downstream of the exhaust flue 8 of the waste material dryer 1, and the inside of the furnace is maintained in a high temperature atmosphere by high-temperature hot air introduced from the burner 12. It burns and decomposes malodorous substances in exhaust gas.
[0013]
The exhaust flue 13 of the deodorizing furnace 11 is connected to a sand dryer 14. The sand dryer 14 exclusively heats the small particle size sand in the aggregate, which is the raw material of the asphalt mixture, and has a drum structure almost the same as that of the waste material dryer 1, and has a number of scrapes on the inner periphery. A cylindrical drum 15 provided with blades (not shown) is rotatably supported on a machine base 16 and is rotated at a predetermined speed by a driving device (not shown). The sand is supplied from the conveyor 18 on the cold hopper 17 side and heated to the desired temperature by contacting with the high-temperature gas from the deodorizing furnace 11 while rolling down the drum 15 and discharged from the outlet on the hot hopper 19 side. is doing. The discharged heated sand is stored in a sand storage bin on the side of the plant body by an appropriate conveying means and used as a material for the asphalt mixture.
[0014]
Reference numeral 20 denotes a new material dryer that heats a new material, and has a structure substantially similar to that of the waste material dryer 1, and a cylindrical drum 21 having a large number of scraping blades (not shown) provided around the inner periphery thereof The drum 21 is rotatably supported on the surface 22 and is rotated at a predetermined speed by a driving device (not shown), and hot air is supplied from a burner 24 on the hot hopper 23 side of one end of the drum 21 while a cold hopper 25 is supplied. A new material is supplied from the side conveyor 26 and heated to a desired temperature. The exhaust flue 27 of the new material dryer 20 is connected to the dust collector 28, and the exhaust gas that has passed through the dust collector 28 passes through the exhaust fan 29 and is discharged from the chimney 30.
[0015]
Further, the exhaust flue 31 of the sand dryer 14 joins the exhaust flue 27 of the new material dryer 20, and the exhaust gas derived from the sand dryer 14 is introduced into the dust collector 28 to remove the dust content in the exhaust gas.
[0016]
Thus, when waste material is supplied to the waste material dryer 1 and heated, exhaust gas containing malodorous components is led out from the exhaust flue 8 and introduced into the deodorization furnace 11. In the deodorizing furnace 11, bad odor components in the exhaust gas are burned and decomposed by high-temperature hot air from the burner 12. Then, the high-temperature gas led out from the deodorizing furnace 11 is guided to the sand dryer 14. In the sand dryer 14, a predetermined amount of sand is supplied by the conveyor 18 and is heated to a predetermined temperature in contact with the high temperature gas. At this time, the heating temperature of the sand is controlled by the supply amount of the sand, and the heated sand is transferred to a sand storage bottle (not shown) on the side of the plant body by an appropriate conveying means and stored.
[0017]
For example, the new material dryer 20 normally heats the new material to about 180 ° C., but the sand dryer 14 heats the sand to a high temperature of about 300 ° C., which is higher than this. If the temperature of the asphalt mixture to be produced is adjusted by appropriately adjusting the amount of high-temperature sand mixed during the production of the asphalt mixture, the mixture at the desired temperature can be produced.
[0018]
In addition, when the sand having a high water content is heated by the sand dryer 14 and the new material dryer 20 is heated by reducing the amount of sand supplied to the sand, the new material dryer 20 is made of aggregate. Since the moisture content fluctuation is small, stable operation can be performed and energy saving can be achieved.
[0019]
In this way, the sand dryer 14 is disposed downstream of the deodorizing furnace 9 that burns and decomposes the malodorous content contained in the exhaust gas of the waste material dryer 1, and the sand is heated by the high-temperature gas derived from the deodorizing furnace 11. Therefore, the retained heat of the high temperature gas in the deodorizing furnace 11 can be effectively used to save energy.
[0020]
【The invention's effect】
As described above, according to the method for producing an asphalt mixture of the present invention, a new material dryer for heating new material and a waste material dryer for heating waste material are provided , and the waste material dryer is led downstream from the exhaust flue of the waste material dryer. A deodorizing furnace that disposes and decomposes bad odors in the exhaust gas exposed to a high temperature atmosphere is disposed, and sand having a high water content ratio is provided downstream of the exhaust flue of the deodorizing furnace with a high temperature gas derived from the deodorizing furnace. In the asphalt mixture manufacturing apparatus, the exhaust flue of the sand dryer is connected to a dust collector, and the exhaust smoke of the waste dryer is heated when the waste dryer is heated. After introducing the exhaust gas derived from the road into the deodorization furnace and burning and decomposing malodorous components in the exhaust gas, the high-temperature gas derived from the deodorization furnace is guided to the sand dryer, and the sand dryer is Supply and heat to high temperature gas to contact with the hot gas, store the heated sand in the sand storage bin on the side of the plant body, mix the predetermined amount of sand in the sand storage bin when manufacturing the asphalt mixture Since the mixture is manufactured, the retained heat of the high-temperature exhaust gas in the deodorization furnace can be effectively utilized by bringing the sand into contact with the high-temperature gas derived from the deodorization furnace and heating the sand to a predetermined temperature in the sand dryer.
[Brief description of the drawings]
1 is a schematic diagram showing one embodiment of a method of manufacturing the asphalt mixture according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Waste material dryer 11 ... Deodorizing furnace 14 ... Sand dryer 20 ... New material dryer 28 ... Dust collector

Claims (1)

While equipped with a new material dryer that heats the new material and a waste material dryer that heats the waste material , the odor component in the exhaust gas derived from the waste material dryer is exposed to the high temperature atmosphere and decomposed downstream of the exhaust gas flue of the waste material dryer. A deodorizing furnace is disposed, and a sand dryer is disposed downstream of the exhaust flue of the deodorizing furnace to heat and dry the sand having a high water content ratio with a high-temperature gas derived from the deodorizing furnace. The end of the exhaust flue of the dryer is an asphalt mixture manufacturing apparatus connected to a dust collector, and when the waste material is heated by the waste material dryer, the exhaust gas derived from the exhaust flue of the waste material dryer is introduced into the deodorizing furnace, After the bad odor is burned and decomposed, the high temperature gas derived from the deodorizing furnace is guided to the sand dryer, and the sand dryer is supplied to the sand dryer and brought into contact with the high temperature gas to be heated to a predetermined temperature. Method for producing sand was stored in the sand storage bottle plant body side, asphalt mixture, characterized in that the sand in the sand storage bin at the time of manufacture of the asphalt mixture so as to produce a predetermined amount contaminating mixture .

Images