JPH057483B2 - - 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 parallel flow type is known in which a burner is provided on the inlet side of the drum.

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 parallel-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 parallel flow dryers 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 is also a problem.

Therefore, the present applicants first invented a new dryer for asphalt plants (Patent Application No. 1983-
017411). This is achieved by installing an inner drum concentrically inside the outer drum, rotating the outer drum and the inner drum together, and installing a heating device at the discharge port of the outer drum. Hot air is blown into the inner drum, and the material that has been dried inside the inner drum is removed through a communication chute provided radially with the discharge port of the inner drum connected to the through hole formed in the outer drum. I try to discharge it outside.

[Problem that the invention seeks to solve]

In the dryer described above, when new material is input into the input port of the outer drum and recycled material is input into the input port of the inner drum, the new material is heated between the outer drum and the inner drum. Dry and heated countercurrently by hot air sent from the device,
On the other hand, the recycled material is dried and heated within the inner drum by hot air whose temperature has slightly decreased after passing between the outer drum and the inner drum. Therefore, two types of aggregates can be heat-treated at the same time using the same equipment, which has the advantage of requiring less installation space, lowering equipment and operating costs, and having good thermal efficiency. However, a device configured in this way does not always dry and heat process two types of materials: new material and recycled material. For example, it may process only new material, and in that case, the following methods may be used. There was a problem. In other words, if material is only put into the outer drum, the inner drum will be empty and will not contribute to drying and heating, resulting in lower thermal efficiency and the exposed inner drum will be exposed to hot air, causing early wear and tear on the inner drum. . On the other hand, if the same material is also put into the inner drum, a device or labor is required to reassemble the materials discharged from each drum, and there are also problems such as the degree of drying and heating being different between the inner and outer drums.

[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 inner drum and the outer drum, and is inserted from the input opening of the outer drum to approximately the center thereof, and is supported by a support, and an inner drum formed on the outer drum. In an asphalt plant dryer, the asphalt plant dryer is equipped with a communication chute that connects the outlet of the inner drum to the outlet of the outer drum, and a heating device that connects the outlet of the outer drum to the outlet of the outer drum. A storage section with a discharge valve at the bottom is provided on the lower side, and a return hole is formed near the through hole of the outer drum, and a storage section is provided at the edge of the return hole as the outer drum rotates. The above-mentioned problems of the conventional method have been solved by providing a scraper for scooping up the material and charging it into the outer drum through the return hole.

[Effect]

When processing both new material and recycled material, the discharge valve of the storage section is opened and the first heating device and second heating device are
While operating the heating device and rotating the outer drum and inner drum in the circumferential direction by the drive device,
New material is input through the input port of the outer drum, and recycled material is input through the input port of the inner drum. The new material introduced into the outer drum passes through the gap formed between the outer drum and the inner drum and gradually moves towards the outlet of the outer drum, where it is heated by hot air sent from the heating device. It is heated and dried, and then taken out from the outlet.

In addition, the recycled material placed in the inner drum is fed from a heating device as it moves toward the communication chute, and is dried by hot air whose temperature has decreased slightly after passing between the outer drum and the inner drum. It is heated and discharged to the outside through the discharge port, the communication chute, the through hole formed in the outer drum, the storage section, and the discharge valve in this order.

In the above operation, the hot air sent from the heating device into the outer drum also works to dry and heat the recycled material across the inner drum, and the hot air sent into the inner drum also dissipates heat to the atmosphere. As this reduces the amount of heat generated, new and recycled materials can be dried and heated more efficiently.

On the other hand, when processing only the same material, for example new material, the new material is put into both the inner drum and outer drum with the discharge valve of the storage section closed, and the new material is dried and heated by the respective heating devices. be done. The new material in the inner drum is discharged from the discharge port through the communication chute and the through hole into the storage section, where it is blocked by the discharge valve and stored. The stored material is scooped out by a scraper and charged into the outer drum through the return hole, where it is mixed with new material flowing from the input port of the outer drum, undergoes drying and heating treatment again, and then transferred to the discharge port of the outer drum. is discharged from.

〔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 rotated in the circumferential direction by a drive device 4. A discharge chute 5 is provided at the discharge port 1b of the outer drum 1, and a burner (heating device) 6 is attached to the center of the discharge chute 5 so as to communicate with the outer drum 1. A belt conveyor (feeding means) 7 for feeding new material into the outer drum 1 is provided.

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,
It 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 the approximately central portion, and is connected to the outer drum by the support 11 and the communication chute 12. 1 is integrally fixed. The communication chute 12 connects the outer drum 1
The exhaust port 10b of the inner drum 10 is connected to the through hole 1c formed almost in the center of the drum, and the exhaust gas is discharged on the upper side of the rotation, and the recycled material is discharged on the lower side of the rotation. This allows new materials and hot air to move freely to the gap G, and also allows for smooth discharge of recycled materials.

Outer drum 1 and inner drum 10 input ports 1a, 1
0a is covered with exhaust manifolds 13 and 14, respectively, and these exhaust manifolds 13 and 14 are connected to a dust collector 15 via exhaust dampers 13a and 14a and an exhaust duct 15a, respectively.
A charging means 1 consisting of a belt conveyor 16 and a charging chute 17 is provided at the discharge port 10b of the inner drum 10.
8 is provided.

Further, 19 is an intermediate manifold provided surrounding the above-mentioned through hole 1c, the lower part of which is open and communicates with the hopper-shaped storage section 43.
In the lower part of this storage part 43, discharge valves 44, 44 made up of an arcuate plate and a pair of side plates are pivotally supported so as to be openable and closable, and a discharge pipe 45 is provided in the lower part of the discharge valve 44. The upper part of the intermediate manifold 19 is connected to the inner drum discharge manifold 13 via a communication duct 21 equipped with an opening/closing damper 20. Note that the communication duct 21 is replaced by the exhaust duct 15a.
The dust collector 15 may be directly connected to the dust collector 15 by contacting the dust collector 15. Further, the dust collector 15 is provided with a damper 22, an exhaust fan 23, and a chimney 24.

The outer drum 1 has a return hole 41 adjacent to the through hole 1c.
is formed with an opening, and this return hole 4
A scraper 42 is formed on the rear side of the edge of the outer drum 1 in the direction of rotation of the outer drum 1 and projects upwardly from the return hole 41. The material accumulated on the lower side of the hole is scooped out and allowed to flow into the return hole 41.

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

First, when processing new material and recycled material at the same time, the discharge valve 44 is kept open, the heating device 6 and the exhaust fan 23 are operated, and the outer drum 1 and the inner drum 10 are moved to the drive device 4. Therefore, while rotating counterclockwise in FIG.
It is put into the inner drum 10 from 0a. outer drum 1
The new material put inside is the outer drum 1 and the inner drum 1.
Moving from left to right in Figure 1 through 0's G,
The first drum is fed into the outer drum 1 from the heating device 6
The hot air flowing from right to left in the figure is used to dry and heat the product in a countercurrent manner, 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 left to right in FIG. street,
It is taken out from the storage section 43 at the lower part of the intermediate manifold 19 through the discharge pipe 45 to the outside.

The exhaust gas that has worked to dry and heat the new material in the outer drum 1 has its ventilation volume reduced by the outer drum exhaust damper 1.
3a, the air is sucked in by the exhaust fan 23 through the exhaust duct 15a and the dust collector 15, and is purified and discharged into the atmosphere from the chimney 24. Separately, the exhaust gas that has worked to dry and heat the recycled material in the inner drum 10 passes through the inner drum exhaust manifold 14, the exhaust damper 14a, and the exhaust duct 15a, and merges with the exhaust gas from the outer drum 1.

On the other hand, when processing only new material, the discharge valve 4
4 is in the closed state, materials are introduced through the input ports 1a, 10a of the outer drum 1 and the inner drum 10 by the input means 7, 18. Outer drum 1 input port 1
The material input from a is dried and heated in a countercurrent manner as described above while flowing toward the discharge port 1b. The material put into the inner drum 10 is dried in the inner drum 10 by receiving hot air from the heating device 6, and then is passed through the communication chute 12 through the discharge port 10b.
It is discharged through the through hole 1c to the storage section 43, where it is blocked by the discharge valve 44 and stored. The stored material is scooped out by the scraper 42 and charged into the outer drum 1 through the return hole 41, where it merges with the material from the input port 1a in the outer drum 1,
Further, while flowing toward the discharge port 1b, the material is subjected to drying and heating treatment while being mixed.
It is discharged from b.

In addition, the communication duct 21 of the intermediate manifold 19
, the outer drum exhaust manifold 1 as in the example above
3, it is also possible to connect directly to the exhaust duct 15a as shown by the two-dot chain line in FIG.

〔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 support. an asphalt assembly comprising: an inner drum; a communication chute provided to connect a discharge port of the inner drum to a through hole formed in the outer drum; and a heating device connected to the discharge port of the outer drum. In a plant dryer, a storage section with a discharge valve at the bottom is provided below the through hole in the outer drum, and a return hole is formed near the through hole in the outer drum. A scraper is installed on the edge to scoop up the material in the storage area as the outer drum rotates and charge it into the outer drum through the return hole.When processing different types of materials, it is possible to combine the processing into one. Because it can be done, the installation space is small, equipment costs and operating costs are low, and thermal efficiency is good. In addition, when processing only the same material, the material to be processed in the inner drum is charged again into the outer drum through the storage section and return hole, mixed with the material to be processed in the outer drum, and then discharged, so thermal efficiency does not decrease. Moreover, it has the excellent effect of being able to perform uniform drying and heating treatment without causing early wear and tear of the inner drum.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a dryer for an asphalt plant according to the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a view taken along the - arrow in FIG. 1. 1...Outer drum, 1a...Inlet, 1b...Outlet, 1c...Through hole, 2...Base, 6...Heating device, 10...Inner drum, 10a...Inlet, 1
0b...Discharge port, 11...Support, 12...Communication chute, 41...Return hole, 42...Scraper, 43...Storage part, 44...Drain valve, G...〓
while.

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. An inner drum that is inserted concentrically with the drum and with a space between it and the outer drum from the input port of the outer drum to approximately the center thereof and supported by a support, and a through hole formed in the outer drum. In an asphalt plant dryer, which is equipped with a communication chute connected to the discharge port of the inner drum and a heating device connected to the discharge port of the outer drum, the bottom side of the through hole of the outer drum is , a storage part equipped with a discharge valve is provided at the bottom, and a return hole is formed near the through hole of the outer drum, and a storage part is formed at the edge of the return hole as the outer drum rotates. A dryer for an asphalt plant, characterized in that it is provided with a scraper that scoops up material from the outside and charges it into an outer drum through a return hole.