JPH07883B2 - Asphalt mix production plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an asphalt mixture material in which a recycling plant capable of heating and regenerating waste asphalt pavement is attached to an asphalt plant for producing an asphalt mixture material which is a road pavement material. It relates to a manufacturing plant.

[Prior Art] Waste asphalt pavement material (hereinafter referred to as "recycled material") dug up by road construction or the like has been heated and recycled to be reused as an asphalt mixture. The recycling plant that heats and recycles this recycled material is rarely installed alone in an asphalt compound material manufacturing plant, and is usually installed together with an asphalt plant that manufactures new asphalt compound material.

This recycling plant has a reclaimed material dryer for heating the reclaimed material.When the reclaimed material is heated by this recycler dryer, fine particles of the reclaimed material are scattered as dust accompanying the gas flow passing through the drum. To do. This dust contains asphalt that has become soft and sticky due to heating, so if a bag filter is used as a dust collector, the filter cloth may become clogged. In many cases, cleaning dust collectors were mainly used because they could not be adopted. However, since the cleaning dust collector uses cleaning water, there are many aspects that are difficult to manage, and the dust collector of the asphalt plant that is adjacent to the recycling plant has a bag filter as the mainstream, so the cleaning dust collector is not used. Devices tended to be shunned.

Therefore, in order to make it possible to use a bag filter as a dust collector of a recycling plant, Japanese Patent Laid-Open No. 60-230408
In the publication, a method is proposed in which a stone filter is mixed with a gas stream discharged from a reclaimed material dryer to attach the stone powder to a sticky dust to form a non-sticky dust so that a bag filter can be used.

[Problems to be Solved by the Invention] However, in the method of mixing stone powder in the gas stream discharged from the recycled material dryer, the cost is increased by using a large amount of stone powder, and the stone powder captured by the bag filter is manufactured. There was a problem that a large amount of dust containing stone powder would be stored in the dust bin unless it was sequentially mixed into the asphalt mixture.

[Means for Solving the Problems] In order to solve the above problems, the present invention intends to effectively use the dust stored in the dust bin arranged in the plant body of the asphalt plant instead of the stone powder. That is, in the asphalt mixture production plant according to the present invention, a new material dryer for heating a new material, and a bag filter disposed downstream of the regenerated material dryer for heating the regenerated material are captured by the bag filter. A dust bin for storing dust is arranged in the plant main body, a pressure feeding pipe having a pressure feeding blower is arranged in the lower discharge part of the dust bin, and a smoke connecting the tip of the pressure feeding pipe to the regenerator dryer and the bag filter. They joined the road.

[Operation] In the asphalt composite material manufacturing plant according to the present invention, when the recycled material is heated by the recycled material dryer,
The dust stored in the dust bin is sent under pressure by a blower and sent into the flue that connects the regrind dryer and the bag filter. The dust sent into the flue is captured by the filter cloth of the downstream bag filter and adheres and deposits on the surface of the filter cloth, protecting the filter cloth from the sticky dust scattered from the recycler dryer. Also, while dust is sent into the flue and flows through the flue, it comes in contact with the sticky dust and can adhere to the surface to make the sticky dust non-sticky, and capture it with a bag filter. It does not cause clogging of the rag.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a new material dryer for an asphalt plant, in which a cylindrical drum having a large number of scraping blades around its inner periphery is rotatably supported in an inclined manner and is rotated at a predetermined rotation speed by a drive device. 2 is a burner, and a fuel tank 3
The supplied oil is burned to form a flame in the dryer 1 and a high-temperature gas is sent, while a new material stored in the aggregate silo 4 for each particle size is cut out by the aggregate feeder 5 in an appropriate amount, and the belt conveyor 6 , 7 to the new material dryer 1, and while heating the new material by the scraping blades, the material is heated to a desired temperature while rolling down in the drum. The heated new material is vertically conveyed by the hot elevator 8, lifted up above the plant main body 9 and put into the screen 10, and sieved to obtain a hot bottle.
Stored according to particle size in 11.

The exhaust gas derived from the new material dryer 1 passes through the flue 12, is guided to the inertial dust collector 13 to capture the dust contained in the exhaust gas, and the coarse particles of dust are captured, and then the bag filter. It is guided to 14 and the fine particles of dust are captured. The cleaned exhaust gas is discharged into the atmosphere from the chimney 16 via the exhaust fan 15.

Reference numeral 17 denotes a recycled material dryer which heats the recycled material, and has a structure similar to that of the new material dryer 1. Reference numeral 18 is a burner for burning the oil supplied from the fuel tank 3 in the combustion chamber.
The high-temperature gas is sent into the recycled material dryer 17 by burning it inside 19, and the recycled material stored in the recycled material hopper 20 is cut out by the recycled material feeder 21 in an appropriate amount and the belt conveyor 2
2. The recycled material drier 17 is charged through the bucket elevator 23 and the belt conveyor 24, and heated to a desired temperature while rolling down in the drum. The heated regenerated material is dropped into the skip bucket 26 of the skip elevator 25, lifted up to the upper part of the plant body 9, and temporarily stored in the regenerated material surge bin 27 provided on the side of the hot bin 11.

The exhaust gas discharged from the recycled material dryer 17 passes through the flue 28 and is guided downstream. The flue 28 is a new dryer 1
The exhaust gas is introduced into the inertial dust collector 13 and the bag filter 14, which are joined to the flue 12 connected to the. Further, in order to effectively use the exhaust gas discharged from the recycled material dryer 17, the flue 28 is branched to reduce a part of the exhaust gas, and the return fan 29 sucks the exhaust gas. , And is returned to the combustion chamber 19 through a cyclone 30 for capturing dust.

Dust bin on the side of the hot bin 11 of the plant body 9
31 is provided, and the dust captured by the bag filter 14 is pressure-fed by a pressure blower (not shown) and stored in the dust bin 31. The dust stored in the dust bin 31 is used as a part of the raw material of the asphalt mixture.

Further, in order to supply the dust stored in the dust bin 31 to the upstream side of the bag filter 14, a pressure feed pipe 32 is provided so as to face the lower discharge portion, and the tip end portion thereof is a recycle material dryer.
Dust stored in the dust bin 31 is connected to the flue 28 of 17 and is dropped into the pressure feed pipe 32 from the lower discharge part to send the pressure blower.
Driving the 33 allows it to be fed into the flue upstream of the bag filter 14.

34 is recycled material surge bin 27, hot bin 11 and dust bin
31 is a measuring instrument provided in the lower order of each of the 31,
Weigh each material by 34 and put into mixer 35,
Asphalt is sprayed and mixed to prepare an asphalt mixture.

When operating only the recycled material dryer 17, the pressure blower 33 is driven while the dust is discharged from the dust bin 31, the dust is sent to the flue 28 via the pressure feed pipe 32, and this dust is fed to the downstream bag filter 14 The filter cloth is captured and adhered and deposited on the surface of the filter cloth to protect the filter cloth from the sticky dust scattered from the reclaimed material dryer 17. Further, while the dust sent from the pressure-feeding pipe 32 collides with the adhesive dust while flowing in the flue 28, the adhesive dust can be attached to the surface of the adhesive dust to make it non-adhesive, and The filter cloth of the bag filter can be prevented from clogging.

When the new material drier 1 and the recycled material drier 17 are operated at the same time, dust is scattered from the new material drier 1 and the dust adheres to and accumulates on the filter cloth of the bag filter 14 to protect the filter cloth and also to the recycled material drier. As it adheres to the sticky dust scattered from 17 as well,
Dust in the dust bin 31 through 32 Bag filter 14
Since the same effect as when it is sent upstream is generated, in this case, the amount of dust sent from the dust bin 31 may be appropriately reduced or the sending may be stopped.

In the embodiment, the exhaust flues of the new material dryer 1 and the regenerated material dryer 17 are merged to form one bag filter 14
The dust scattered by is captured, but the new material dryer 1 and the recycled material dryer do not merge the exhaust flue.
A bag filter may be provided in each of the 17 types. In this case, when the new material dryer 1 and the recycled material dryer 17 are operated at the same time, the dust is discharged from the dust bin 31 as in the case where only the recycled material dryer 1 is operated. While driving the pressure blower 33, the recycled material dryer is driven through the pressure feed pipe 32.
It is necessary to send dust to the 17 downstream flues 28.

Further, in the embodiment, the dust in the dust bin 31 is sent to the flue that connects the reclaimed material dryer 17 and the bag filter 14, but the present invention is not limited to this and is sent upstream of the bag filter 14. Needless to say, it may be directly fed to the recycled material dryer 17, and this does not change the essence of the present invention.

[Effects of the Invention] In the asphalt composite material manufacturing plant according to the present invention, the dust stored in the dust bin 31 is recycled into the recycled material dryer 17
Since it is configured so that it can be sent to the upstream flue of the bag filter 14, the filter cloth can be protected from sticky dust by depositing the dust in the dust bin 31 on the filter cloth surface of the bag filter 14. . It is also possible to make sticky dust non-sticky by causing it to collide with sticky dust flowing in the flue.
It is also possible to prevent clogging of the filter cloth. Further, this dust is used for reducing the dust stored in the dust bin 31, so that there is no cost, and there is no trouble in operation.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an asphalt mixture manufacturing apparatus according to the present invention. 1 ... New material dryer, 2 ... Burner, 4 ... Aggregate silo, 9 ... Plant body, 12 ... Flue, 14 ... Bag filter, 17 ... Recycled material dryer, 18 ... Burner, 19 ......
Combustion chamber, 20 …… Recycled material hopper, 25 …… Skip elevator, 27 …… Recycled material surge bin, 28 …… Flue, 31 …… Dust bin, 31 …… Pressure pipe, 33 …… Pressure blower

Claims (1)

[Claims] 1. A new material dryer for heating a new material, and a bag filter disposed downstream of the reclaimed material dryer for heating a reclaimed material, and a dust bin for storing dust captured by the bag filter is provided in a plant body. Arranged,
An asphalt mixture manufacturing method, characterized in that a pressure-feeding pipe having a pressure-feeding blower is arranged at a lower discharge portion of the dust bin, and a tip end of the pressure-feeding pipe is joined to a flue connecting a regenerator dryer and a bag filter. plant