JPH0584321B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dryer capable of simultaneously and separately drying and heating new material and recycled material in an asphalt plant.

[Conventional technology]

As a dryer used in an asphalt plant, there is a counter-current type dryer in which a drum is supported on a base in an inclined state with the input port at the top and the discharge port at the bottom, and a burner is provided on the discharge port side of the drum. A co-current type is known in which a burner is provided on the inlet side of the drum.

[Problem that the invention seeks to solve]

The above two types of dryers are designed to dry and heat new materials (new aggregate) and recycled materials (asphalt waste) efficiently and with as little pollution as possible.
Counter-current type dryers are used for new aggregate, and co-current type dryers are used for asphalt waste.

For this reason, in an asphalt plant that simultaneously produces new and recycled materials, it is necessary to install the two types of dryers mentioned above, which not only increases equipment and maintenance costs, but also requires a large area of land for installation. This is also uneconomical. In addition, in the case of a co-flow dryer for regeneration, asphalt mist is mixed in the exhaust gas, which tends to cause blue smoke and bad odors, causing pollution.In addition, asphalt mist adheres to the filter cloth, which puts restrictions on dust collectors. There are also problems.

[Means for solving problems]

The present invention consists of an outer drum which is supported on a base in an inclined state with the input port at the top and the discharge port at the bottom, and which is rotated in the circumferential direction by a required drive device; At the same time, an inner drum is inserted concentrically with the outer drum, with a gap formed between the outer drum and the outer drum, and is inserted from the input port of the outer drum to approximately the center thereof, and is supported by a fixing means, and an inner drum that is supported by a fixing means; a communication chute that communicates the discharge port of the inner drum with a through hole formed in the portion and that is provided radially around the inner drum to freely move the material to be heated and the hot air in the outer drum;
The above conventional problems are solved by including a first heating device connected to the outlet of the outer drum and a second heating device connected to the input port of the inner drum. .

[Effect]

While operating the first heating device and the second heating device and rotating the outer drum and the inner drum in the circumferential direction by the drive device, new material is fed from the input port of the outer drum, and new material is fed into the inner drum. Inject recycled materials into each mouth. The new material put into the outer drum gradually moves toward the outlet of the outer drum through the gap formed between the outer drum and the inner drum, and is heated by the hot air sent from the first heating device. As a result, it is dried and heated countercurrently and taken out from the outlet.

In addition, while the recycled material fed into the inner drum moves toward the communication chute, it is dried and heated in parallel by the hot air sent from the second heating device, and then passes through the discharge port and the communication chute to the outside. It is discharged to the outside through holes formed in the drum.

In the above operation, the hot air sent into the outer drum from the first heating device acts to dry and heat the recycled material across the inner drum, and the hot air sent into the inner drum from the second heating device Similarly, the inner drum is used to dry and heat new materials, and the radiation of heat to the atmosphere is suppressed, so new materials and recycled materials can be dried and heated accordingly.

Furthermore, since the inner drum for recycled materials is inserted into the outer drum, the installation area is small, and the through holes provided in the outer drum are connected to the first heating device by a connecting duct, and the outer drum The exhaust gas of the second heating device, which is discharged from the through hole, is sent to the first heating device to improve thermal efficiency, and the asphalt mist contained in the exhaust gas is used as fuel to prevent blue smoke and bad odors. I can do it.

〔Example〕

The accompanying drawings illustrate one embodiment of the invention,
Reference numeral 1 in the figure is an outer drum. This outer drum 1
As is well known, the input port 1a is placed on top and the discharge port 1 is placed on top.
It is supported by support rollers 3 on a base 2 in an inclined state with b facing down, and is configured to be rotated in the circumferential direction by a drive device (not shown). An exhaust manifold 4 is provided at the input port 1a of the outer drum 1, and a discharge chute 5 is provided at the discharge port 1b. is attached so that the combustion chamber 7 communicates with the outer drum 1, and furthermore, a charging means 9 consisting of a belt conveyor for charging new material into the outer drum 1 is disposed at the charging port 1a.

Inside the outer drum 1, there is an inner drum 10 having an input port 10a and a discharge port 10b.
0a is on top and the discharge port 10b is on the bottom,
A chute (fixing means) is inserted concentrically with the outer drum 1 and with a gap G formed between the outer drum 1 and the outer drum 1 from the input port 1a to approximately the center thereof, and communicates with the support (fixing means) 11. ) 12 is integrally fixed to the outer drum 1. The communication chute 12 communicates the exhaust port 10b of the inner drum 10 with the through hole 1c formed in the approximate center of the outer drum 1, and discharges exhaust gas on the upper side of rotation and discharges recycled material on the lower side of rotation. Together with the supports 11, they are provided radially around the inner drum 10, allowing free movement of new material from the gap G toward the discharge port 1b and movement of hot air toward the gap G in the outer drum. Note that it is convenient to provide the communication chute 12 in the tangential direction of the inner drum 10 as shown in FIG. 2, since the recycled material can be smoothly discharged.

A burner 13 is installed at the input port 10a of the inner drum 10.
A second heating device 15 comprising a combustion chamber 14 and a charging means 18 comprising a belt conveyor 16 and a charging chute 17 are provided.

Reference numeral 19 denotes an intermediate manifold provided surrounding the through hole 1c, the lower part of which is open, and the upper part connected to the first heating via a communication duct 22 equipped with a relay fan 20 and an opening/closing damper 21. It is connected to the combustion chamber 7 of the device 8 . A dust collector 23 , an exhaust fan 24 , and a chimney 25 are connected to the exhaust manifold 4 through an exhaust duct 26 .

Thus, 27 is an opening/closing damper, 28 is a flight provided on the inner peripheral surface of the outer drum 1, and 29 is a flight provided on the inner peripheral surface of the inner drum 10.

Next, the operation of the asphalt plant dryer according to the present invention configured as described above will be explained.

The first heating device 8, the second heating device 15, and the exhaust fan 24 are operated, and the outer drum 1 and the inner drum 1 are
0 is rotated counterclockwise in FIG. 2 by a drive device, new material is introduced into the outer drum 1 from the input port 1a by the input means 9, and recycled material is inputted by the input means 18. It is put into the inner drum 10 from the opening 10a. The new material placed in the outer drum 1 is fed into the outer drum 1 from the first heating device 8 while moving from right to left in FIG. 1 through the gap G between the outer drum 1 and the inner drum 10. The heated air is dried and heated countercurrently by the hot air flowing from left to right in FIG. 1, and is discharged to the outside through the discharge chute 5 from the discharge port 1b.

On the other hand, the recycled material placed in the inner drum 10 is
While moving inside the inner drum 10 from right to left in FIG. 1, it is fed into the inner drum 10 from the second heating device 15 and is dry-heated in a cocurrent manner by hot air flowing from right to left in FIG. It passes through the communication chute 12 from the discharge port 10b and is taken out from the lower part of the intermediate manifold 19 to the outside.

The exhaust gas that has worked to dry and heat the new material in the outer drum 1 is sucked in by the exhaust fan 24 and purified by the dust collector 23, as usual, and then sent to the chimney 25.
released into the atmosphere. Separately, the exhaust gas that has worked to dry and heat the recycled material in the inner drum 10 is sucked by the relay fan 20 and sent into the combustion chamber 7 of the first heating device 8 through the communication chute 12 and communication duct 22. It can be done. Therefore, the asphalt mist is combusted, improving thermal efficiency, eliminating the generation of blue smoke and bad odors caused by the asphalt mist, preventing pollution, and preventing asphalt mist from adhering to the filter cloth.

Note that flights 30 may be provided on the outer peripheral surface of the inner drum 10 inserted into the outer drum 1, or the connecting duct 2 may be
2 (or the intermediate manifold 19) to the exhaust duct 26 and a connecting duct 32 equipped with an opening/closing damper 31.
You can also connect with.

〔Effect of the invention〕

As explained above, the dryer for an asphalt plant of the present invention includes an outer drum that is supported on a base in an inclined state with the input port at the top and the discharge port at the bottom, and is rotated in the circumferential direction by a required drive device.
With the input port facing upward and the discharge port facing downward, it is inserted concentrically with the outer drum, with a gap formed between the outer drum and the outer drum, and is inserted from the input port to approximately the center of the outer drum, and is supported by a fixing means. The discharge port of the inner drum is connected to the through hole formed approximately in the center of the inner drum, and the material to be heated and the hot air in the outer drum are freely moved radially around the inner drum. A communication chute provided and a first communication chute connected to the discharge port of the outer drum.
The structure includes a heating device and a second heating device connected to the input port of the inner drum, and the counter-current type outer drum and the co-current type inner drum are integrated into one. , requires a small installation area, has low equipment and operating costs, and has good thermal efficiency. Another great advantage is that the present invention can be easily implemented by inserting the inner drum into the drum of an existing countercurrent dryer.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a dryer for an asphalt plant according to the present invention, and FIG. 2 is a cross-sectional view of a portion of a communication chute. 1... Outer drum, 1a... Inlet, 1b... Outlet, 1c... Through hole, 2... Base, 8... First
Heating device, 10... Inner drum, 10a... Inlet, 10b... Outlet, 11... Support (fixing means), 12... Communication chute (fixing means), 15
...Second heating device, G...Gap.

Claims (1)

[Claims] 1. An outer drum supported on the base in an inclined state with the input port on top and the discharge port on the bottom and rotated in the circumferential direction by a required drive device, and an outer drum with the input port on top and the discharge port on the bottom. The inner drum is inserted concentrically with the drum, with a gap formed between the outer drum and the outer drum, and is inserted from the inlet to the approximately central portion of the outer drum, and is supported by a fixing means.The inner drum is formed approximately in the central portion of the outer drum. The discharge port of the inner drum is connected to the through hole, and the material to be heated and the hot air in the outer drum are freely moved. A dryer for an asphalt plant, comprising: a first heating device connected in series; and a second heating device connected to an input port of the inner drum.