JPH0791805B2 - Deodorizing recycling plant for asphalt pavement waste - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste asphalt pavement recycling plant capable of preventing odor pollution.

[0002]

2. Description of the Related Art As a recent pollution problem, there is smoke odor from an asphalt pavement waste material recycling plant in the suburbs of the city. In the recycling of waste asphalt pavement materials, the majority of the methods involve direct contact between hot gas and the material in the heating process, and the odor of volatile matter generated from asphalt is included in the exhaust gas.

The odor in the exhaust gas of a recycling plant is caused by flammable mist generated from asphalt,
To remove odor, exhaust the heating dryer to 700-8
It is effective to allow the flammable mist to burn by allowing it to stay in a deodorizing furnace at 00 ° C for 0.5 to 1 second and reheating.

Therefore, a deodorizing type asphalt pavement waste material recycling plant shown in FIG. 2 is known. That is, this recycling plant is equipped with the first burner 8
And a heating dryer 4 for heating the asphalt pavement waste material by bringing the hot air of the first burner 8 into contact with the asphalt pavement waste material, and a dust collector 21 for purifying the hot air used for heating the asphalt pavement waste material by the heating dryer 4. A deodorizing furnace 14 into which the hot air that has been collected and purified by the dust collector 21 is introduced; and a second burner 17 that burns the asphalt mist present in the hot air introduced into the deodorizing furnace 14 to deodorize it. Deodorization furnace 1
And a heat exchanger 28 for applying the heat of the hot air of No. 4 to the combustion air of the burners 8 and 17, and burns the combustible mist generated in the heating dryer 4 in the deodorizing furnace 14 to remove the odor.

[0005]

However, in the conventional deodorizing type recycling plant for asphalt pavement waste materials, the hot air of the second burner 17 which burns asphalt mist in the deodorizing furnace 14 is supplied to the burners 8 and 17. By simply heating the combustion air that is generated through the heat exchanger 28, the combustion air is released to the atmosphere as it is at a high temperature. Therefore, there is a drawback that the heat efficiency is poor and the production cost is increased.

The operating time of this type of asphalt plant per day is usually about 8 hours, and since there are many intermittent operations, a heat exchanger is installed for heat recovery, and other heat sources,
For example, it is difficult to use for district heating and hot water supply.

The present invention relates to a new aggregate and a waste asphalt pavement material.
It is an object of the present invention to provide a deodorizing type recycling plant for waste asphalt pavement, which has good heat efficiency and workability and can be simultaneously heated without mixing with and.

[0008]

In order to achieve the above-mentioned object, the present invention is provided so as to be rotatable in the circumferential direction and substantially horizontally.
Heated between the outer cylinder with a circular cross section and the inside of the outer cylinder.
A chamber is formed and is provided concentrically with the outer cylinder and along with the outer cylinder in the circumferential direction.
Heating dryer with circular cross section that can be rotated to
Feeder for new aggregates to add new aggregates to the chamber
Recycled aggregate that puts waste asphalt pavement into a thermal dryer
For supplying hot air to the feeding feeder for heating and the above heating dryer
A first burner, a deodorizing furnace into which hot air that has worked to heat the asphalt pavement waste material by the heating dryer is introduced, and an asphalt component in the hot air introduced into the deodorizing furnace is burned to deodorize and the hot air is heated to the above. a second burner for feeding to the chamber,
A dust collector for purifying the hot air coming out of the heating chamber is provided. Adjust the heating chamber to the connecting duct that connects to the dust collector.
The hot air whose amount is adjusted by the economizing damper is fed to the combustion chamber of the first burner.
It is preferable to have a branch duct for circulation.
Yes.

[0009]

[Function] The second method of burning asphalt mist in the deodorizing furnace
The hot air from the burner enters the heating chamber and heats the asphalt pavement waste through the heating dryer. For this reason, the heat can be sufficiently recovered, and the thermal efficiency is improved.

Depending on the method of recycling the asphalt pavement waste material, a new aggregate may be added to the asphalt pavement waste material to adjust the particle size. In such a case, the new aggregate is put into the heating chamber, and the new aggregate is heated by the hot air of the second burner in which the asphalt mist is burned in the deodorizing furnace to further improve the thermal efficiency and improve the work efficiency. be able to. Contact duct
If a branch duct was installed on the, it worked to heat the new aggregate.
The appropriate amount of hot air is circulated in the combustion chamber of the first burner to further heat it.
The efficiency can be increased.

[0011]

FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 is an outer cylinder having a circular cross section. The outer cylinder 1 is supported substantially horizontally by two pairs of drum rollers 2 and 3 (both of which are on the front side only in the figure), and is rotated in the circumferential direction by a rotary drive device (not shown). .

A heating dryer (inner cylinder) 4 having a circular cross section is provided inside the outer cylinder 1. The heating dryer 4 is concentric with the outer cylinder 1, and a heating chamber 5 is formed between the heating dryer 4 and the outer cylinder 1. The heating dryer 4 rotates in the circumferential direction together with the outer cylinder 1.

Manifolds 6 and 7 are provided at the left and right ends of the heating dryer 4, and a combustion chamber 9 of a burner 8 is fixed to the right manifold 7 in FIG. The waste asphalt pavement is fed into the heating dryer 4 from the manifold 7 by the feeding feeder 11 for recycled aggregate, heated in the heating dryer 4 by the hot air supplied from the burner 8 and discharged from the manifold 6.

The manifold 1 is provided at the left and right ends of the outer cylinder 1.
2 and 13 are provided, respectively. The manifolds 6, 7, 12, and 13 are fixed to the floor side, and do not rotate together with the outer cylinder 1 and the heating dryer 4.

Manifold 6 of heating dryer 4 and outer cylinder 1
A deodorizing furnace 14 is installed in the manifold 12 of the ducts 15 and 16
Have been contacted by each. The hot air of the burner 8 which has heated the asphalt pavement waste material in the heating dryer 4 is introduced into the deodorizing furnace 14 through the manifold 6 and the duct 15. Then, the asphalt mist in the hot air is burned by the burner 17 in the deodorizing furnace 14 together with other combustible components to remove the odor. The hot air of the burner 17 that has worked for deodorization passes through the duct 16 and the manifold 12 and enters the heating chamber 5 between the outer cylinder 1 and the heating dryer 4.

New aggregate is charged into the heating chamber 5 from the manifold 13 by the new aggregate charging feeder 18. The new aggregate is heated by the hot air supplied from the manifold 12 to the heating chamber 5 and taken out of the manifold 12 to the outside. Since the new aggregate does not have a combustible component such as asphalt, even if the new aggregate is heated, a combustible mist that causes an odor does not occur in the hot air.

A dust collector 21 is connected to the manifold 13 via a communication duct 19. The hot air that has heated the new aggregate in the heating chamber 5 is sucked by the exhaust fan 22 and passes through the dust collector 21, where it is purified and discharged to the atmosphere. Dust collector 21
May be wet or dry. In the heating chamber 5, the asphalt pavement waste is also heated by the deodorized gas via the heating dryer 4.

A branch duct 23 branches from the communication duct 19 and communicates with the combustion chamber 9 of the burner 8 . A circulation fan 24 is provided in the branch duct 23, and the duct 19
A part of the hot air is circulated in the combustion chamber 9. Branch duct 23
The adjustment damper 25 provided at the branching portion of the control unit adjusts the amount of hot air released to the atmosphere and the amount of circulation to the combustion chamber 9. Reference numeral 26
Is a heat insulating material.

In the deodorizing type recycling plant for waste asphalt pavement, the hot air obtained by heating the waste asphalt pavement by the heating dryer 4 is burned by the burner 17 in the deodorizing furnace 14.
As a result, combustible mist can be burnt, so no odor pollution occurs. In addition, the hot air of the burner 17 is introduced into the heating chamber 5 to heat the new aggregate, and also heats the heating dryer 4 and, if necessary, can be circulated to the combustion chamber 9 so that sufficient heat can be obtained. It is possible to improve the thermal efficiency by recovering it.

[0020] Incidentally, detailed structures such as heating dryer 4 and the manifold, and heating system (countercurrent, cocurrent type) of asphalt pavement waste, etc. is arbitrary not limited to that of FIG. Further, in the plant of FIG. 1, the heating of the new aggregate by the gas after deodorization is of the countercurrent type, and a better heat transfer efficiency can be obtained, but it may be of the cocurrent type. It goes without saying that the combustion air of each burner 8, 17 may be heated by the deodorized gas.

[0021] In conventional deodorization shaped recycling plant of Figure 2 the deodorization after gas has been discharged at about 500 ° C., if a new aggregate in the plant of the present invention were placed in the outer cylinder 1, exhaust from about Good results were obtained that the heat could be recovered up to 200 ° C.

[0022]

As described above, according to the present invention, the circumferential direction
An outer cylinder with a circular cross-section that is rotatably provided substantially horizontally,
A heating chamber is formed between the outer cylinder and the outer cylinder so as to be concentric with the outer cylinder.
A cross-section circle that is provided on the and can be rotated in the circumferential direction together with the outer cylinder.
-Shaped heating dryer and a new type that introduces new aggregate into the above heating chamber
Asphalt is added to the feeder for aggregate and the above heating dryer.
And a feeder for recycled aggregate that inputs waste pavement material, and
A first burner for supplying hot air to the heating dryer, a deodorizing furnace into which hot air that has worked to heat the asphalt pavement waste material by the heating dryer is introduced, and an asphalt component in the hot air introduced into the deodorizing furnace is burned. Deodorize and add the hot air to the above
A second burner to supply the heat chamber are configured to have and a precipitator to purify the hot air exiting the heating chamber, heating de
Hot air generated by heating waste asphalt pavement with a liner deodorizes
Combustible mist was burned by the second burner in the furnace
Therefore, no odor pollution will occur. Also the heat of the second burner
The wind is introduced into the heating chamber to heat the new aggregate,
Since the heating dryer is also heated, the heat must be sufficiently recovered and
It is possible to recycle scrap pavement waste materials at a low cost,
Moreover, mixing asphalt pavement waste with new aggregate
It is possible to work efficiently by simultaneously heating without.

[0023] When a branch duct is provided in the communication duct
Is an appropriate amount of hot air that has worked to heat the new aggregate.
It can be circulated in the combustion chamber to further improve thermal efficiency.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a deodorizing type recycling plant for waste asphalt pavement according to the present invention.

[Fig. 2] Deodorization type recycling of conventional asphalt pavement waste
It is a front view of a Kuru plant.

[Explanation of symbols] 1 Outer cylinder 4 Heating dryer 5 Heating chamber 8 Burner 11 Feeder for recycled aggregate 14 Deodorizing furnace 17 Burner 18 Feeder for new aggregate 19 Connecting duct 21 Dust collector 23 Branch duct 25 Adjusting damper

Claims (2)

[Claims] 1. A substantially horizontal arrangement rotatably in the circumferential direction.
An outer cylinder having a circular cross section, and a heating chamber between the outer cylinder and the outer cylinder.
And is installed concentrically with the outer cylinder and along with the outer cylinder in the circumferential direction.
Heating dryer with circular cross section that can be rotated, and the above heating chamber
Feeder for new aggregates to add new aggregates to
For recycled aggregate that puts asphalt pavement waste into the dryer
First, to supply hot air to the feeding feeder and the heating dryer.
1 burner, a deodorizing furnace into which hot air that has worked to heat waste asphalt pavement by the heating dryer is introduced, and an asphalt component in the hot air introduced into the deodorizing furnace are burned to deodorize the hot air in the heating chamber. the second burner and, on the supplied
Deodorization type recycling plant asphalt pavement waste, characterized by comprising a precipitator to purify the hot air exiting the serial heating chamber. 2. A communication duct connecting the heating chamber to the dust collector.
In addition, the hot air whose amount was adjusted by the adjustment damper was burned in the first burner.
It is characterized by the provision of a branch duct that circulates in the baking chamber.
The deodorizing type LISA of asphalt pavement waste according to claim 1.
Uccle plant.