JP2742635B2 - Asphalt mixture production equipment - Google Patents

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 asphalt mixture production in which a new material dryer for heating new aggregate and a waste material dryer for heating waste are provided. It concerns 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. As a device for heating this waste material, generally, a device having substantially the same structure as a dryer (hereinafter referred to as "new material dryer") which is a new aggregate heating device for an asphalt plant is employed. The above-mentioned waste material heating dryer (hereinafter referred to as “waste material dryer”) is often provided together with the new material dryer.

[0003]

However, when the waste material to which asphalt is adhered is heated by the waste material dryer, an odorous exhaust gas is generated depending on the heating conditions, causing a bad odor to flow near the plant, which cannot be ignored in terms of pollution. It can cause problems.

[0004] In view of the above, it is an object of the present invention to provide an asphalt mixture production apparatus capable of deodorizing odorous gas discharged from a waste material dryer by properly combining a new material dryer and a waste material dryer. .

[0005]

In order to achieve the above object, the present invention provides a new material dryer for heating new aggregate and a waste material dryer for heating waste material, and a predetermined length is provided at one end of the new material dryer. the burner for new material heating provided through the combustion chamber, provided with a new bone material supply means at the other end, said
The combustion chamber is longer than the burner flame.
And a hot air outlet duct is connected downstream of the combustion chamber, the other end of the hot air outlet duct is connected to a waste material supply side at one end of the waste material dryer, and the other end of the waste material dryer exhaust duct connected to the end is obtained by concatenating the upstream side of the combustion chamber of the new material dryer with intervening air blower and air-flow control damper.

[0006]

According to the present invention, when simultaneously heating the new aggregate and the waste material, the burner of the new material dryer is burned to form a flame in the combustion chamber, and high-temperature hot air is sent into the new material dryer. To heat the new aggregate. Also, we introduced into waste dryer to force sucking from the hot air outlet ducts having a portion of the hot air generated in the combustion chamber downstream of the combustion chamber. Its to,
After heating the waste material in the waste material dryer, the discharged exhaust gas is sent to the upstream side of the combustion chamber of the new material dryer, and is brought into contact with the high-temperature hot air generated from the burner in the combustion chamber to burn off odor components in the exhaust gas. It deodorizes odors generated from waste materials. Further, the high-temperature exhaust gas discharged from the waste material dryer is once passed through the new material dryer and released into the atmosphere, so that heat is recovered in the new material dryer, so that effective use of heat can be achieved.

[0007]

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 aggregates. The new material dryer rotatably inclines and supports a cylindrical drum 3 in which a number of scraping blades 2 are provided. (Not shown)). Reference numeral 4 denotes a burner provided on the hot hopper 5 side of the new material dryer 1, which forms a flame in the combustion chamber 6 and sends high-temperature gas into the drum 3, while supplying a new aggregate provided on the cold hopper 7 side. The new aggregate is fed through a conveyor 8 as a means, and the new aggregate is heated to a predetermined temperature while being rolled down while being scraped up by the scraper blades 2 and discharged from the discharge unit 9. An exhaust flue 10 is connected to a cold hopper 7 of the new material dryer 1, and an exhaust fan 11 for sucking exhaust gas, a bag filter 12 for removing dust in the exhaust gas, and a chimney 13 for discharging exhaust gas to the atmosphere are provided downstream thereof. Is provided.

The combustion chamber 6 also serves as a deodorizing furnace, and it is preferable to secure a hot air passage which takes at least one second for hot air to pass in order to completely burn off the malodorous components in the exhaust gas.

Reference numeral 14 denotes a waste material dryer for heating and regenerating the waste material. The waste material dryer has substantially the same structure as that of the new material dryer 1. And a hot hopper 17 at one end,
A cold hopper 18 is provided at the other end. Then, the waste material is supplied from the hot hopper 17 side by the conveyor 19 as the waste material supply means, and the waste material is heated to a predetermined temperature while being rolled down in the drum while being scraped up by the scraper blades 16 and discharged from the discharge unit 20. .

In order to guide the hot air generated by the burner 4 to the waste material dryer 14, a downstream side of the combustion chamber 6 and a hot hopper 17 of the waste material dryer 14 are connected by a hot air outlet duct 21. An exhaust duct 22 is connected to the cold hopper 18 of the waste material dryer 14, and a cyclone dust collector 23 and an exhaust fan 24 are provided in the middle of the exhaust duct 22, and the other end is connected to the combustion chamber 6 of the new material dryer 1.
It is connected to the upstream side of. In addition, the exhaust duct 22 branches downstream of the cyclone dust collector 23 and connects the circulation duct 25, a circulation fan 26 is provided in the middle of the circulation duct 25, and the other end is connected to the hot air outlet duct 21, A part of the exhaust gas having a lowered temperature discharged from the waste material dryer 14 is circulated and combined with the high-temperature hot air in the hot air outlet duct 21, and the hot air introduced into the waste material dryer 14 is appropriately adjusted to a temperature suitable for heating the waste material. I can do it.

Numerals 27, 28, 29, and 30 denote air flow rate adjustment dampers disposed in the respective flues, and control the air flow rate so as to obtain a desired opening.

When simultaneously heating the new aggregate and the waste material, the burner 4 is burned to form a flame in the combustion chamber 6, and the hot air is sucked by the exhaust fan 11 on the downstream side and the inside of the drum 3 is sucked. Maintain a hot gas stream passing through. Then, the new aggregate is supplied into the drum 3 by the conveyor 8, and the aggregate is heated to a predetermined temperature. At this time, the combustion control of the burner 4 controls the amount of combustion of the burner 4 so as to maintain the temperature of the hot air near the outlet downstream of the combustion chamber 6 at a predetermined temperature, for example, about 800 ° C. Therefore, the temperature of the heated aggregate is adjusted by adjusting the supply amount of the new aggregate.

Next, the exhaust fan 2 downstream of the waste material dryer 14
A part of the hot air in the combustion chamber 6 is forcibly sucked through the hot air outlet duct 21 while the suction amount is adjusted by the damper 30 by driving the 4, and the hot air is guided into the waste material dryer 14. Then, the hot hopper 17 of the waste material dryer 14 is conveyed by the conveyor 19.
The waste material is supplied from the side, and the waste material is heated to a predetermined temperature by a co-current heating method. At this time, the circulation fan 26 provided in the middle of the circulation duct 25 is driven to adjust the temperature of the hot air introduced into the waste material dryer 14, and the temperature discharged from the waste material dryer 14 is reduced while adjusting the suction amount by the damper 29. A part of the exhaust gas is sent into the hot air outlet duct 21. In this way, the hot air sent into the waste material dryer 14 is lowered from about 800 ° C. to about 600 ° C., and is adjusted to a temperature suitable for heating the waste material. Waste material dryer 14
Once the amount of waste material supplied to the furnace and the set temperature of heated waste material are determined,
Since the required amount of heat to be introduced into the waste material dryer 14 can be determined, the opening degree of each of the dampers 29 and 30 is controlled to adjust the air flow so as to introduce a predetermined amount of heat. The fine adjustment of the heating temperature of the waste material depends on the amount of waste material supplied and the dampers 29, 30.
Performed by the control of

The exhaust gas discharged from the waste material dryer 14 is sent into the combustion chamber 6 after dust is removed by the cyclone dust collector 23. As a result, the temperature inside the combustion chamber 6 tends to fluctuate, but the amount of combustion of the burner 4 is adjusted to control the hot air temperature near the downstream outlet of the combustion chamber 6 to be maintained at about 800 ° C.

The exhaust gas sent from the waste material dryer 14 to the combustion chamber 6 is exposed to a flame of about 1200 ° C.
By contacting with hot air of 800 ° C. or more while passing through the combustion chamber 6 for more than a second, the malodorous components contained in the exhaust gas are burned and decomposed and deodorized. Waste material dryer 1
Since the high-temperature exhaust gas discharged from 4 passes through the new-material dryer 1, heat is recovered in the new-material dryer 1 and effective use of heat can be achieved.

Further, according to the asphalt mixture manufacturing apparatus according to the present invention, the waste material dryer 14 is fired empty and the drum 15
It is possible to burn and remove the waste material adhering to the inner wall of the device. When performing the combustion removal, first, the exhaust fan 24 is driven while the supply of the waste material to the waste material dryer 14 is stopped, and the hot air of about 800 ° C. in the combustion chamber 6 is guided to the waste material dryer 14. As a result, the internal temperature of the drum 15 rises, and the waste material adhering to the drum inner wall ignites and starts burning. By starting the waste material combustion, the driving of the exhaust fan 24 is stopped. Since the suction of the cold hopper 18 is stopped by stopping the operation of the air blower 24, the combustion gas generated in the drum 15 is sucked from the hot hopper 17 side and passes through the hot air outlet duct 21. Flow to the upstream side of the combustion chamber 6 and the drum 3 of the new material dryer 1
Guided inside.

The combustion gas comes into contact with the aggregate in the new material dryer 1 and exchanges heat, and the mist and the exhaust gas collide with and adhere to the aggregate particles or are trapped by the downstream bag filter 12. In addition, since there is no device in the hot air outlet duct 21 through which the high-temperature combustion gas passes, which does not hinder exposure to high temperatures, the waste material dryer 14 is ignited to burn the waste material adhering to the inner wall. Can be handled well. When burning this waste material, a new material dryer 1
However, if the combustion amount of the burner 4 is controlled so as to maintain the hot air outlet temperature of the combustion chamber 6 at about 800 ° C., the combustion amount of the burner 4 is reduced. Therefore, there is no problem on the device. As a result, it is possible to eliminate the harsh work of removing waste material adhering when a worker enters the waste material dryer 14.

In this embodiment, the hot air for heating the waste material is taken out from the vicinity of the downstream exit of the combustion chamber 6, but the hot air is taken out from the hot hopper 5 of the new material dryer 1 and the high temperature portion of the drum 3. You may do it. In the embodiment, the exhaust duct 22 of the waste material dryer 14 is connected to the vicinity of the burner 4 on the upstream side of the combustion chamber 6, but it may be connected to the primary air intake of the burner 4 to use exhaust gas as primary air for combustion. good. Furthermore, in the present embodiment, a part of the exhaust gas discharged from the waste material dryer 14 is circulated through the circulation duct 25 to adjust the temperature of the hot air introduced into the waste material dryer 14, but the circulation is reduced although the thermal efficiency is reduced. Duct 2
5 may be omitted to adjust the temperature of the hot air as a structure for taking in outside air, and further, an auxiliary burner may be provided on the hot hopper 17 side of the waste material dryer 14 without departing from the scope of the present invention. Of course, changes can be made.

[0020]

As described above, according to the present invention, the new material dryer 1 and the waste material dryer 14 are provided side by side, and the new material dryer 1 is provided with a combustion chamber 6 of an appropriate length also serving as a deodorizing furnace. Since a part of the hot air generated in the combustion chamber 6 is supplied to the waste material dryer 14 and the exhaust gas passing through the waste material dryer 14 is returned to the combustion chamber 6 again, the exhaust gas from the waste material dryer 14 Odor component can be burned in the combustion chamber 6, and the odor generated when the waste material is heated can be deodorized. In addition, since the high-temperature exhaust gas discharged from the waste material dryer 15 can be recovered in the new material dryer 1, heat can be effectively used. Furthermore, the waste material adhering to the inside of the drum 15 can be removed by burning the waste material dryer 14 in an empty state.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of one embodiment of the present invention with a part cut away.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... New material dryer 4 ... Burner 6 ... Combustion chamber 8 ... New aggregate supply means 14 ... Waste material dryer 21 ... Hot air derivation duct 22 ... Exhaust duct 24 ... Air blower 25 ... Circulation duct 26 ... Circulation fan

Claims (1)

(57) [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 a predetermined length. , provided with a new bone material supply means at the other end, said
The combustion chamber is longer than the burner flame.
And a hot air outlet duct is connected downstream of the combustion chamber, the other end of the hot air outlet duct is connected to a waste material supply side at one end of the waste material dryer, and the other end of the waste material dryer an exhaust duct for connecting the ends asphalt mixture manufacturing apparatus characterized by with intervening air blower and the air volume adjusting dampers were consolidated on the upstream side of the combustion chamber of the new material dryer.