JPH04117008U - Asphalt pavement waste recycling equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent generation of blue smoke and odor when heating asphalt waste. [Structure] Dust processing device 1 for producing an asphalt mixture by mixing supplied aggregate, stone powder, and asphalt, and for processing dust generated from a dryer 11.
In an asphalt plant having a recycle dryer (drum mixer) 3 provided between a dryer 11 and a dust treatment device 15, the exhaust gas from the recycle dryer 3 is inserted into the dryer 11 between the dryer 11 and the recycle dryer 3. A means 9 for doing so is provided. [Effect] The exhaust gas generated by the drum mixer is circulated through the dryer again for secondary combustion, which prevents the generation of odors and blue smoke, and improves combustion efficiency by using part of the dryer exhaust gas. It becomes economical.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a recycling dryer exhaust gas treatment device.

0002

[Conventional technology]

Currently, the structures of general paved roads include asphalt pavement, concrete Two types of pavement and simple pavement are known.

0003 Asphalt pavement is constructed on a leveled roadbed by sequentially applying the lower subbase, upper subbase, base subbase, Pavement consisting of a surface layer and a wear layer on top of the surface layer. A so-called asphalt mixture is used for the base layer, surface layer, and wear layer.

0004 This asphalt mix is usually manufactured by an asphalt plant at the factory stage. Approximately 90% of this material is crushed stone as aggregate and stone powder as filler. It contains asphalt. This asphalt mixture is manufactured by In an asphalt plant, a burner flame is used in a dryer that rotates at a constant speed. Crushed stone and stone powder heated and dried at high temperature by radiant heat and similarly heated and melted. It is manufactured by mixing with asphalt. This asphalt mixture are transported directly to the paving site by truck, etc., or are partially stored in the factory floor space. Stored at high temperatures in phalt mixture silos.

[0005] In the manufacturing process of asphalt mixture, the above-mentioned crushed stone is heated at high temperature and mixed, etc. A large amount of dust and exhaust gas is generated and becomes a source of air pollution. Dust and exhaust gas treatment equipment is required.

[0006] On the other hand, in recent years, as a result of the increasing traffic volume, roads have been severely damaged. Repairs to pavement sections are frequently carried out. Asphalt is used in the pavement area to be repaired. It contains rut and aggregate, and recently it has been recycled to save resources. It is becoming.

[0007] For this reason, various recycling plants for reusing the asphalt waste material is developed by the manufacturer.

[0008]

[Problem that the idea aims to solve]

However, in these various recycling plants, If the burner flame is directly injected and heated to about 800°C or higher, the waste material can be converted into a low melting point aluminum. Because it contains asphalt, the asphalt burns and causes the so-called blue smoke. There was a problem in that it generated a lot of heat and odor.

[0009] This invention was made to eliminate the above-mentioned drawbacks, and it is possible to use asphalt waste material. The purpose is to prevent blue smoke and odor from occurring when heating. do.

0010

[Means to solve the problem]

The asphalt pavement waste recycling device of this invention uses a driver to heat and dry the aggregate. The aggregate and asphalt storage equipment Mix stone powder and asphalt to produce an asphalt mixture, and A dust treatment device for treating dust generated from the dryer, and the dryer and the dryer. For heating, drying and mixing asphalt pavement waste installed between the dust treatment equipment In an asphalt plant with a recycling dryer, A recycle dryer is provided between the dryer and the recycle dryer. The dryer is characterized by comprising means for inserting the exhaust gas into the dryer.

[0011]

[Effect]

In this invention, the exhaust gas generated by the drum mixer is recirculated to the dryer. Secondary combustion. The heating temperature inside the drum mixer is operated at a temperature that does not cause overheating. This improves combustion efficiency and prevents the generation of odors and blue smoke.

0012

【Example】

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

[0013] Figure 1 shows how the asphalt pavement waste recycling device according to the present invention is installed on an existing asphalt pavement. It is a layout diagram when installed in a plant.

[0014] In Figure 1, the existing asphalt plant includes a crushed stone storage device 10, a dryer -11, stone powder storage device 12, asphalt storage device 13, and for mixing these Dust for treating dust generated from the mixing device 14 and the dryer 11 It consists of a processing device 15. In this asphalt plant, crushed stone The stones are fed from the stone storage device 10 to the dryer 11 by the belt conveyor 10a, Inside the dryer 11, the fuel oil is burned by heavy oil supplied from the heavy oil tank 11a. The mixture is heated and dried by the burner 11b, and mixed via the elevator 14a and the sieve 14b. It is transported to the combining device 14. In this mixing device 14, also from the stone powder storage device 12, Stone powder and asphalt storage device 1 transported via elevator 12a The asphalt conveyed from 3 through pipe A is mixed and the asphalt is combined. material is manufactured.

[0015] This asphalt mixture is directly paved by a truck 16 from the bottom of the mixing device 14. Either they are transported to the installation site, or some of them are stored at high temperatures in the mixed material silo 17. Ru.

[0016] Further, an asphalt pavement is provided between the dryer 11 and the dust treatment device 15. A drum mixer 3 is installed to recycle waste materials. this drum mixer 3 is attached to the dryer 11, and the inlet side is connected to the dryer 11 through the flue 4. The dust treatment device 15 is further connected to the dust treatment device 15 via a duct D.

[0017] In this embodiment, the flue 8 is connected to the drum mixer 3 from the outlet side. Connected to Year 11. This flue 8 is provided with an exhaust fan 9.

[0018] In addition, asphalt pavement waste R is pre-crusted using a crusher and a sieve (not shown). The waste material is made into a constant particle size and stored in the waste material supply device 1.

[0019] This waste material R is transported from the waste material supply device 1 to the conveyor belt 2 at a constant speed. It is fed into a rotating drum mixer 3. Here, the flue 4 is a driver as described above. The mumixer 3 is installed alongside the dryer 11, and the exhaust gas G from the dryer 11 is A portion of the water flows into the drum mixer 3. The exhaust gas G generated in the dryer 11 The temperature is about 110°C to 120°C, and the oil is separately supplied from the heavy oil tank 11a. The heavy oil F is used as secondary air for the burner 5, and the combustion of the burner 5 is I try to keep the temperature appropriate.

[0020] Therefore, the asphalt and aggregate contained in the waste material R are contained in the drum mixer 3. It melts without being excessively heated, and a suitable asphalt mixture can be obtained.

[0021] In this way, the asphalt waste material is not heated excessively in the drum mixer 3. The heating temperature is kept at approximately 800°C. Therefore, in this embodiment, the drum Discharged from the outlet side of the mixer 3 through the flue 8 to the vicinity of the burner 11b of the dryer 11. Gas H is supplied to cause secondary combustion within the dryer 11. exhaust gas H is forcibly blown by an exhaust fan 9.

[0022] The asphalt mixture obtained by the drum mixer 3 is placed on the outlet side of the drum mixer 3. The charged material is transported from the charge hopper 6 by the skip 7 to the mixed material silo 17. Injected and stored.

[0023] Note that the dust from the waste material generated in the drum mixer 3 is crushed by this dryer 11. It rotates with stones, etc., and most of it is captured. However, the powder not captured at this stage Dust is also captured and cleaned by the cyclone 15a and bag filter 15b, It is discharged to the outside via the exhaust fan 15c and the chimney 15d.

[0024] The asphalt pavement waste recycling device with the above configuration starts from the drum mixer 3. The exhaust gas H is circulated to the dryer 11 to cause secondary combustion within the dryer 11. This prevents the generation of odors and blue smoke, and also prevents the generation of smoke inside the drum mixer. Combustion efficiency is improved by maintaining the appropriate temperature.

[0025]

[Effect of the idea]

As explained above, the asphalt pavement waste recycling device of the present invention uses a drum The exhaust gas generated by the mixer is circulated through the dryer again for secondary combustion. This prevents the generation of odors and blue smoke, and also eliminates some of the exhaust gas from the dryer. Its use improves combustion efficiency and makes it economical.

[Brief explanation of drawings]

FIG. 1 is a layout diagram when an apparatus for recycling asphalt pavement waste according to an embodiment of the present invention is installed in an existing asphalt plant.

[Explanation of symbols]

1 Waste storage equipment 2,10a Belt conveyor 3, drum mixer 4,8 Flue 5,11b burner 6 Charge hopper 7 Skip 9,15c Exhaust fan 10 Crushed stone storage device 11 Dryer 11a Heavy oil tank 12 Stone powder storage device 12a, 14a elevator 13 Asphalt storage equipment 14 Mixing device 14b Sieve 15 Dust treatment equipment 15a Cyclone 15b Bag filter 15d chimney 16 tracks 17 Mixed wood silo A Asphalt pipe D duct F Heavy oil G Exhaust gas H Exhaust gas R Asphalt pavement waste material

Claims (1)

[Scope of utility model registration request] [Claim 1] An asphalt mixture is produced by mixing the aggregate, stone powder, and asphalt supplied from a dryer for heating and drying the aggregate, a stone powder storage device, and an asphalt storage device, and the asphalt mixture is produced from the dryer. An asphalt plant having a dust treatment device for treating dust, and a recycling dryer for heating and drying and mixing asphalt pavement waste material provided between the dryer and the dust treatment device, wherein the dryer and the recycling dryer are An apparatus for recycling asphalt pavement waste material, characterized in that a means for inserting exhaust gas from the recycling dryer into the dryer is provided between the dryers.