JPS5836635B2 - How to reuse asphalt waste - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for burning asphalt in asphalt waste, recovering aggregate, and effectively using the generated heat.

Conventional asphalt waste materials (hereinafter referred to as waste materials) are processed by thermal crushing,
Alternatively, after being mechanically crushed, it is heated and dried in an inclined rotating cylindrical heating furnace to obtain a recycled composite material.

However, recycled composite materials have inferior properties compared to new composite materials because the asphalt deteriorates to some extent.

Therefore, it has been desired by the industry to find an effective method for recycling waste materials into composite materials comparable to new composite materials.

The present invention was made in consideration of the above circumstances, and it burns the asphalt content in waste materials and effectively uses the heat, and mixes the remaining burned aggregate with new heated aggregate to produce asphalt. This method provides a method for use in plants, in which waste materials are burned in a rotary combustion furnace, aggregates in the waste materials are recovered, and the exhaust gas generated by the combustion is collected in a sloping furnace installed almost continuously with the combustion furnace. Introduced into a rotating cylindrical heating furnace,
After the new aggregate is heated and dried, it is used as a heat source to preheat the waste material, and the preheated waste material is crushed and then put into the rotary combustion furnace.

The present invention will be described in detail below with reference to the drawings.

The drawing shows an example of an apparatus for carrying out the method of the present invention, and the reference numeral 1 in the drawing is a part of the housing.

A rotating cylindrical combustion furnace 2 is provided on one side of the Hosopa part 1, and an inclined rotating cylindrical heating furnace 3 for heating and drying new aggregate is provided on the other side.

The cylindrical portion 2a of the combustion furnace 2 and the cylindrical portion 3a of the heating furnace 3 are as follows:
Within the header part 1, one circular opening end of each is substantially opposed to each other.

At the other end of the cylindrical portion 2a of the heating furnace 20, there is a burner 2b for burning waste materials and a shoe for charging the waste materials into the cylindrical portion.
2c is provided.

Furthermore, tire rollers 2d, 2d are provided on the outer periphery of the rotating cylindrical body 2a.
are provided, and these tires 2d, 2d support rollers 2
e, 2e, and supports the cylindrical portion 2a almost horizontally.

The support rollers 2e, 2e are rotated by a motor 2f, and the cylindrical portion 2a is rotated.

The inside of the cylindrical portion 2a has a tapered shape that widens toward the housing part 1, and a weir 2g is provided around the end of the housing part 1.

Further, the heating furnace 3 is almost the same as one used for heating and drying aggregates generally used in asphalt plants.

That is, an exhaust gas outlet 3b and an aggregate import inlet 3c are provided at the end of the rotating cylindrical portion 3a of the heating furnace 30.

An aggregate carrying-in device 3d is provided at this carrying-in port 3c.

Tire rollers 3e, 3e are provided on the outer periphery of the cylindrical portion 3a, and are placed on support rollers (not shown), so that the cylindrical portion is rotated by a motor (not shown).

A fly }3f is provided on the inner surface of the cylindrical body 3a.

The exhaust gas outlet 3b of the heating furnace 3 is connected to the inlet 4a of the cyclone 4, and the outlet 4b is connected to the bag filter 5.

The bag filter 5 is connected to a waste material receiving hopper 7 via an exhaust fan 6.

The upper part of this receiving hopper 7 has an opening of 300 to 500 m.
A grizzly grizzly 7a of size m is attached, and a feeder 7b is attached to the lower part.

The waste material carried out by this feeder γb is fed into a crusher 8.

The waste material crushed into pieces of 50 mm or less by the crusher 8 is transferred to the chute 2 by a conveying device such as an elevator 2h.
c.

Next, the operation of the apparatus configured as described above for carrying out the present invention will be explained.

The waste materials are piled up on the griddle at the top of the waste material receiving hopper 7 by a lift vehicle 9 or the like.

Exhaust gas hot air sent by an exhaust fan 6 is fed into the hopper 7 .

This hot air heats and softens the asphalt of the waste material inside the hopper 7, and also thermally crushes the asphalt of the waste material on the grizzly Ia.

The waste material that has been thermally crushed below the opening of the grizzly 7a falls into the homper 7, and the asphalt content is further softened.

This softened waste material is transferred to a crusher 8 by a feeder 7b.
is supplied to

At this time, since the asphalt content is softened, the waste material can be crushed to 501n7IL or less with less power.

The waste material crushed into pieces of 59 mm or less is fed into the cylindrical portion 2a of the rotary combustion furnace 20 through a shoe 2c by a conveying device 2h or the like.

The asphalt portion of the waste material thrown in is ignited by the flame of the burning burner 2b and spontaneously combusts.

The waste material is stored in the cylinder 2a by a weir 2g at the end of the cylinder part 2a.

The asphalt is evenly burnt away while being stirred by the rotation of the cylindrical portion 2a, leaving only the aggregate.

The remaining aggregate is removed from the weir 2g as the cylindrical part 2a rotates.
It falls into the hopper part 1 and is taken out to the outside.

On the other hand, the hot air generated by the combustion of asphalt is introduced into the cylindrical portion 3aK of the heating furnace 30 because the exhaust gas outlet of the heating furnace 3 is sucked by the exhaust fan 6.

The new aggregate introduced through the aggregate introduction port 3C of the cylindrical part 3a gradually moves toward the hopper part 1 while being stirred by the flights 3f due to the rotation and inclination of the cylindrical part 3a.

In this process, the aggregate is heated and dried by hot air drawn in from the combustion furnace 2.

The heat-dried aggregate falls from the hopper part 1, and together with the recycled aggregate discharged from the combustion furnace 2, is sent as heat-dried aggregate to an asphalt plant, where it is used as aggregate for asphalt mixture. .

The hot air suctioned and discharged from the exhaust gas outlet 3b is guided to the cyclone 4, where most of the dust contained therein is removed, and the dust is almost completely removed by the bag filter.

The purified exhaust gas is introduced below the waste material receiving hopper 7 via the exhaust fan 6, and is used to soften the asphalt in the waste material as described above.

In this device, by adjusting the amount of exhaust gas sucked in by the exhaust fan 6, the amount of air sucked from the burner side of the combustion furnace 2 is adjusted, and the temperature inside the heating furnace can be freely adjusted. .

As described above, the method according to the present invention burns the asphalt content of waste material, regenerates the waste material as aggregate, uses the heat of this combustion exhaust gas to heat dry new aggregate, and crushes it. The heat of asphalt combustion is effectively used because it heats and softens the waste materials and reduces the power burden on the crusher.

In addition, recycled aggregate is discharged from a part of the hopper together with new aggregate as heat-dried aggregate, sent to an asphalt plant, and made into asphalt mix, producing high-quality asphalt mix using waste materials. You can.

[Brief explanation of drawings]

The figure shows an example of an apparatus for carrying out the method of the invention. 1... Hosopa part, 2... Rotary combustion furnace, 2a... Combustion furnace cylindrical part, 2b... Combustion furnace burner, 2c... ...Shoot, 2g...
... Weir, 3... Inclined rotating cylindrical heating furnace, 3a
... Heating furnace cylindrical part, 3b ... Exhaust gas outlet, 3c ... Aggregate delivery port, 3d ...
・Aggregate loading device, 4...Cyclone, 5...
... Bag filter 6 ... Exhaust fan, 7 ...
...Waste material receiving homper 7a...Grizzly,
7b...Feeder, 8...Crusher.

Claims (1)

[Claims] 1 Asphalt waste is put into a combustion furnace and burned, and this combustion exhaust gas is introduced into an inclined rotating cylindrical heating furnace connected to the combustion furnace to heat and dry the new aggregate, and then the asphalt waste is preheated and softened. . A method for reusing asphalt waste material, characterized in that the aggregate in the burned asphalt waste material is recovered as heated aggregate together with new aggregate.