JPS6354582A - Drier for drying and heating asphalt aggregate, etc. - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method of drying and heating two types of materials with different properties, such as new aggregate and recycled aggregate, under conditions suitable for their properties. Regarding asphalt bones (A) and other drying/heating dryers.

[Conventional technology]

Conventionally, in asphalt plants, when producing recycled composite material by mixing recycled bone 10A into new aggregate, the new aggregate is overheated to prevent deterioration and combustion of the asphalt components contained in the recycled aggregate. and regular/llr& recycled aggregate in a mixer, and then heat the recycled aggregate with new aggregate to obtain a recycled composite material.Alternatively, a dryer exclusively for recycled aggregate is installed in the asphalt plant. Regenerated aggregate is produced by heating the recycled aggregate and mixing it with new bone that has been heated in another dryer.

[Problem that the invention seeks to solve]

However, in the former case, there are restrictions on overheating the new bone phase in terms of equipment or thermal efficiency, and it is not possible to heat the recycled aggregate according to theory, so the heated drying of the recycled aggregate tends to be insufficient. Practical use of the contamination rate of regenerated skeleton A -120
Some people are dissatisfied with the fact that they cannot increase the amount by more than 2%.

In addition, in the latter case, there are disadvantages as mentioned above (although there is no need to go to the trouble of installing a dedicated dryer for the recycled bone shrine in addition to the dryer for the new aggregate, which requires additional equipment). It becomes complicated, and it is not economical as it increases not only the equipment cost but also the operating cost. In addition, asphalt mist mixes with the exhaust gas and tends to cause blue smoke and bad odors, and it also adheres to the filter cloth of the bag filter and damages it. Therefore, there is a problem in that there are restrictions on the dust collector.

[Means for solving problems]

The present invention provides an inclined cylindrical rotating drum having a lower manifold at the lower end, an intermediate manifold at the middle, and an upper manifold at the upper end, and a heating device installed in the lower manifold of the inclined cylindrical rotating drum. and an intake port for heated waste such as a discharge nozzle for recycled aggregate etc. at the lower end, and the above-mentioned discharge nozzle is provided at the intermediate manifold portion of the inclined cylindrical rotating drum. The two-end opening portions are respectively disposed in the upper manifold portion, and a gap is formed between the two ends of the upper manifold and the inclined cylindrical rotating drum. Installed in the tube and the upper manifold above:
a first charging means for charging new aggregate, etc. into the inclined cylindrical rotating drum; a second charging means, partially installed in the manifold, for charging recycled skeletons 4, etc. into the inner cylinder;
The rotary drum exhaust part of the first part manifold is equipped with a dust collector, an exhaust fan, etc. connected via an exhaust duct, and the inner cylinder exhaust part of the first part manifold is connected to the combustion chamber of the heating device. The above-mentioned conventional problems have been solved by providing a circulation duct provided with a circular duct.

[Effect]

The inclined cylindrical rotating drum and the inner cylinder are rotated in the circumferential direction, and while the heating device feeds heated gas into the inclined cylindrical rotating drum, new aggregate is introduced into the inclined cylindrical rotating drum by the first input means. is charged into the inner cylinder by the second charging means.

The new aggregate placed in the inclined cylindrical rotating drum gradually moves downward through the gap between the inclined cylindrical rotating drum and the inner cylinder.
It is heated and dried in heated gas and discharged from the lower manifold.

On the other hand, the recycled aggregate introduced into the inner cylinder is dried and heated by heated gas fed into the inner cylinder from the intake port at the lower end, and is discharged from the intermediate manifold.

The heated gas used to dry and heat the new aggregate in the inclined cylindrical rotating drum is sucked by the exhaust fan and discharged into the atmosphere from the rotating drum exhaust section of the upper manifold through the exhaust duct and dust collector. In addition, the heated gas that has worked to dry and heat the recycled aggregate in the inner cylinder is sucked by a circulation fan and introduced into the combustion chamber of the heating device through a circulation duct, where it is used to dry and heat the asphalt mist material.

In the above case, the heated gas sent into the inner cylinder works to heat the new aggregate in the inclined cylindrical rotating drum and lowers the temperature to an appropriate level before reaching the intake port of the inner cylinder. The asphalt components contained in it may burn,
It does not deteriorate its properties.

The fresh bones dried and heated as described above and the recycled aggregate are mixed in a mixer or the like to obtain a recycled composite material.

〔Example〕

FIGS. 1 and 2 show an embodiment of the present invention, and in these figures, reference numeral 1 represents an inclined cylindrical rotating drum. This inclined cylindrical rotating drum 1 is supported by a pivot shaft 2 and a jack 3, and is tilted freely in three parts with the pivot shaft 2 as a fulcrum. The rotary drum 1 is mounted on the rotary drum 1 and is configured to be rotated in the circumferential direction by a rotary drive device (not shown) in a well-known manner.A lower manifold 6 is provided at the lower end, middle and upper end of the inclined cylindrical rotary drum 1. , an intermediate manifold 7 and an upper manifold 8 are respectively provided and fixed to the base.

"The two-legged lower manifold 6 has a burner 9a and a combustion chamber 9.
At the center of the upper end side of the inclined cylindrical rotating drum l, an inner cylinder 1O is arranged to form a gap 1.1 between it and the inclined cylindrical rotating drum I. It is provided concentrically with the cylindrical rotating drum 1. This inner cylinder lO
is for drying and heating recycled aggregate, etc., and has a discharge noute 12 for recycled aggregate, etc. and a heating gas intake 1]1 at the lower end.
3, and the discharge chute 12 is arranged in the intermediate manifold 7 part of the inclined cylindrical rotating drum I.
The two-end opening part 14 is connected to the inner cylinder exhaust part 8 of the upper manifold 8.
1) and is fixed to the inclined cylindrical rotating drum I through a discharge chute 12 and a rod-shaped sabot 15.

Further, a damper I7 is provided at the outside air intake port II6 of the intermediate manifold 7 so as to be openable and closable by a hinge I8, and a discharge feeder 19 for recycled aggregate, etc. is provided at the lower part of the intermediate manifold 7. At the lower part of the upper manifold 8, there is a first input means 20 such as a belt conveyor for inputting new pre-material etc. into the inclined cylindrical rotary drum 1, and recycled aggregate etc. A second inputting means 21 such as a belt conveyor is provided, and the upper rotary drum exhaust section 8a and the inner cylinder exhaust section 8b are provided with a second input means 21 such as a belt conveyor.
An exhaust duct 22 and a circulation duct 23 are installed individually. Blades 24 are provided radially in the intake port 13 and rotate together with the inner cylinder 10 to repel the recycled aggregate to the right in FIG. 1 and prevent the recycled aggregate from falling into the inclined cylindrical rotating drum 1. It becomes.

In addition, on the inner peripheral surfaces of the inclined cylindrical rotating drum 1 and the inner cylinder 10,
As is well known, there are provided raking vanes 25, 4.

Reference numeral 26 denotes a badge tower, which includes a hot elevator 28 that receives fresh material discharged from the lower manifold 6 via a feeder 27, a screen 29 that sieves the new material received from the hot elevator 28 according to particle size, and a screen. 21] and the hot bin 30 for storing the sieved fresh materials according to particle size.
a weighing hopper 3I arranged under the weighing hopper 31, a mixer 32 arranged under the weighing hopper 31, and the intermediate manifold 7.
A serge bin 33 receives and stores the recycled aggregate discharged from the discharge feeder 19 via a conveyor (not shown), and puts the recycled aggregate into the weighing tube 31 as necessary. ing.

The exhaust duct 22 includes an opening/closing damper 34 and a dust collector 35.
, and an exhaust fan 36 are installed, and the circulation duct 23 is equipped with an opening/closing damper 37 and a circulation fan 38,
It is connected to the combustion chamber 91) of the heating device 9. 39
is a connecting duct which is provided with an opening/closing duct 40 and connects the exhaust duct 22 and the circulation duct 23, but this is not always necessary.

Next, the operation of the dryer for drying and heating asphalt aggregate, etc. configured as described above will be explained.

Rotating the inclined cylindrical rotating drum I and the inner cylinder 10 in the circumferential direction,
While operating the exhaust fan 36 and circulation fan 38,
While feeding heated gas into the inclined cylindrical rotating drum 1 by the operation of the heating device 9, new material is fed into the inclined cylindrical rotating drum 1 by the first charging means 20, and recycled aggregate is fed into the inclined cylindrical rotating drum 1 by the second charging means 2I.
, respectively, into the inner cylinder 10.

The new material placed in the inclined cylindrical rotating drum 1 moves to the lower end of the inclined cylindrical rotating drum 1 through the gap 11 between the inclined cylindrical rotating drum 1 and the inner cylinder 10, and is discharged from the lower manifold 6. However, during this time, the inclined cylindrical rotating drum 1
It is dry-heated countercurrently by heating gas moving inside from left to right in FIG. In addition, the recycled aggregate placed in the inner cylinder 1O is taken in and passed between the blades 24 in the 113 portion (pulled) and passed through the inside of the inner cylinder 10 while being heated by the heated gas put in the inner cylinder 10. In Figure 1, the new pipe material moves gradually to the left and is discharged from the discharge shaft 5.-1-12 to the discharge feeder 19 of the intermediate manifold 7. It is sent to the screen 29 through the filter, where it is classified according to particle size and stored in a pot bin 30.
The recycled aggregate discharged in step 9 is stored in the Zahn bin 33. The new tubes and regenerated bone phase stored in the pot bin 30 and the serge bin 33 are weighed in the weighing hopper 31 and transferred to the mixer 3.
2 and mixed at a desired blending ratio to form a recycled composite material.

The heated gas used to dry and heat the new pipe material in the inclined cylindrical rotating drum 1 is cleaned by removing dust etc. in a dust collector 35, and then is discharged to the atmosphere through an exhaust fan 36. In addition, exhaust gas containing a large amount of asphalt mist, which enters the inner cylinder 10 from the intake port 13 and works to dry and heat the recycled aggregate, is sucked by the circulation fan 38 and sent to the circulation duct 23.
The asphalt mist is circulated through the combustion chamber 9b of the heating device 9, where the asphalt mist is burned and reused for drying and heating the new pipe +4 and recycled aggregate. In addition, if there is a small amount of asphalt mist contained in the exhaust gas that heated the recycled aggregate, the circulation fan 38 is stopped, the opening/closing damper 37 is closed, and the opening/closing damper 40 is opened to reduce the amount of recycled aggregate. The exhaust gas subjected to dry heating is sent from the connecting tact 39 to the exhaust duct 22 and is discharged into the atmosphere through the dust collector 35.

-, the temperature of the heated gas introduced into the inner cylinder 10 from the intake port 13 is a temperature at which the asphalt component in the recycled aggregate does not deteriorate or burn, that is, 5008C.
This is usually adjusted by operating the heating device 9, opening of the damper 17.34°37.39, or adjusting the exhaust fan 3.
Perform the adjustment in step 6 by changing the amount of new pipe material introduced. In addition,
The recycled aggregate may be introduced into the mixer 32 from the Zanohin 33 via a dedicated weighing hopper (not shown).

In addition, when not drying and heating the recycled aggregate with this dryer, a part of the new pipe material, especially the fine particles that are easily heated, can be poured into the inner cylinder IO, or the inclined cylindrical rotating drum can be used without using the inner cylinder IO.
Dry and heat the new pipe material using a chisel.

〔Effect of the invention〕

As explained below, the dryer for drying and heating asphalt aggregate, etc. according to the present invention has an inner cylinder provided in the inclined cylindrical rotating drum, and works to dry and heat the new pipe material to lower the temperature appropriately. Since the recycled aggregate is dried and heated using heated gas, the recycled aggregate can be efficiently and sufficiently dried and heated without degrading or burning the asphalt components. In addition, it is easy to increase the mixing rate of recycled aggregate in new pipe materials, and there is no need for a dryer specifically for recycled aggregate, and the equipment and operating costs are not high, and are no different from before. Economical. A circulation duct equipped with a circulation fan was installed to connect the exhaust part for the inner cylinder of the manifold and the combustion chamber of the heating device, and worked to dry and heat the recycled aggregate in the inner cylinder. Returning the heated gas to the combustion chamber of the heating device 1. Since the structure is designed to burn the asphalt mist contained in the asphalt mist, it not only prevents troubles such as blue smoke and bad odors caused by asphalt mist, but also improves thermal efficiency. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a dryer for drying and heating asphalt aggregate, etc. according to the present invention, and FIG. 2 is a sectional view of a portion n-11 of FIG. 1. l... Inclined cylindrical rotating drum, 6... Lower manifold,
7...Middle manifold, 8. Upper manifold,
8a... Exhaust section for rotating drum, 8b... Exhaust section for inner cylinder, 9... Heating device, 9 b. Combustion chamber, 10... Inner cylinder,
DESCRIPTION OF SYMBOLS 11 Gap, 12...Exhaust duct, 13...Intake, 14...Top opening, 20...First input means, 21・Second input means, 22・Exhaust duct, 23・
...Circulation duct, 35. Dust collector, 36. Exhaust fan, 38.
・Circulation fan.

Claims (1)

[Claims] an inclined cylindrical rotating drum having a lower manifold at the lower end, an intermediate manifold at the middle, and an upper manifold at the upper end; a heating device provided in the lower manifold of the inclined cylindrical rotating drum; It is provided with a discharge chute for recycled aggregate, etc. and an intake port for heated gas, and the discharge chute is disposed in the middle manifold part of the tilted cylindrical rotating drum, and the upper end opening is disposed in the upper manifold part of the tilted cylindrical rotating drum. An inner cylinder is provided concentrically with the inclined cylindrical rotating drum at the center of the inclined cylindrical rotating drum with a gap formed between the inner cylinder and the inclined cylindrical rotating drum, and a new aggregate is provided in the inclined cylindrical rotating drum in the upper manifold. a first input means for inputting recycled aggregate, etc.; and a second input means provided in the upper manifold for inputting recycled aggregate, etc. into the inner cylinder.
an input means, a dust collector and an exhaust fan connected via an exhaust duct to the rotary drum exhaust part of the upper manifold, and a circulation fan, and connect the inner cylinder exhaust part of the upper manifold to the combustion chamber of the heating device. A dryer for drying and heating asphalt aggregate, etc., characterized in that it is equipped with a circulation duct provided as a duct.