JPH05141641A - Shredder dust incineration processing method - Google Patents

Abstract

PURPOSE:To obtain a shredder incineration processing method which prevents the discharge of harmful substances and collects thermal energy based on perfect combustion. CONSTITUTION:A shredder dust incineration processing method is designed to incinerate and process shredder dust 12 generated by shredder treatment of discarded cars directly as duct or mixed dust by using molten steel in an electric furnace 20 or a high temperature atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to plastics of dust produced by shredder treatment of abandoned automobiles and the like,
Shredder dust incineration method that enables incinerating inflammable components, mainly rubbers, while suppressing pollution, and using the combustion energy as heat energy when scrap is melted in an electric furnace. Regarding

[0002]

2. Description of the Related Art Dust produced by shredder processing of abandoned automobiles includes plastics and rubbers. In order to meet the need for weight reduction in automobiles, the use of plastics is naturally increasing, and the ratio of plastics in dust is also increasing.

Since shredder dust of abandoned automobiles is a dust of a binding material of various materials, it is difficult to recycle the dust. Therefore, at present, dust disposal by landfill is common.

When the shredder dust is incinerated,
Exhaust gas treatment equipment and cooling equipment are required to deal with the treatment of generated harmful substances (SO _x , NO x, HCl) and the increase in incineration temperature.

[0005]

However, in the process of landfilling, the landfill site is becoming more and more costly and the cost of the landfill process is becoming a major social problem. Is rising is a problem.

It is an object of the present invention to provide a method for incinerating shredder dust which can suppress the generation of harmful gas, does not increase the amount of equipment, and can utilize combustion energy.

[0007]

According to the present invention, the above object can be achieved by the following shredder dust incineration method. That is, shredder dust generated by shredding abandoned automobiles, etc., using molten steel or high temperature atmosphere in an electric furnace, is incinerated as dust or as mixed dust, a method for incinerating shredder dust. ..

[0008]

In the above-mentioned method of the present invention, since the shredder dust is incinerated by the electric furnace, high temperature (800-1300)
Processing at a temperature of ° C) is possible for a short time. Plastics generate combustible gas in the electric furnace and are completely burned instantly because of the high temperature atmosphere. Further, the thermal energy at the time of burning the plastic dust is used as a part of the thermal energy for melting scrap of the electric furnace.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a shredder dust incineration method according to the present invention will be described below with reference to the drawings. The incineration method of the shredder dust of the present invention is a step of shredding waste automobiles and the like, a step of removing a large amount of glass and other incombustibles from dust generated by the shredder by sieving, and dust remaining by sieving. Crushing and solidifying as required, and a step of incinerating combustible components such as plastics by charging into an electric furnace.

The shredder dust is charged into the electric furnace by a scrap charging bucket 2 as shown in FIG. 1, a chute 4 as shown in FIG. 2 to drop the furnace, and FIG. Although there is such injection into the furnace by the pressure-feeding lance 6 and injection into the molten steel 10 by the pressure-feeding lance 8 as shown in FIG. 4, any method may be used.

In the scrap loading bucket, as shown in FIG. 1, the scrap loading bucket 2 is charged with shredder dust 12 containing small pieces of plastics and rubber at the bottom thereof, and lime is placed on the shredder dust 12. 14, covered with iron scrap 16, the lid 22 of the electric furnace 20 is opened to move the bucket 2 onto the electric furnace 20, the door 18 of the bucket 2 is opened, and the shredder dust 12 and lime 14 in the scrap loading bucket 2 are opened. , The scrap 16 is put into the electric furnace 20. When charged, the dust 12 is burned at the same time as the scrap 16 is melted.

When the shredder dust 12 is charged into the bottom of the bucket 2, the upper part of the dust 12 remains covered with the lime 14 and the scrap 16 even when the shredder dust 12 is charged into the electric furnace 20. Molten steel 24
This is to prevent them from flying over. The reason why the dust 12 is covered with lime 14 is that when the shredder dust 12 contains vinyl chloride, hydrochloric acid is generated at the time of combustion, but Cl is easily captured as chloride by the added lime. .. The diagram in FIG. 7 shows that HCl is absorbed in the presence of lime addition. Also, S is SO
It can take the form of ₂ and be captured by lime.

Combustible materials such as plastics in the shredder dust 12 generate heat during combustion, and this heat is used as heat for melting the iron scrap 16 to recover heat energy. Also, shredder dust 12
When the combustible material inside is burnt to form a carbide, the carbide acts as a reducing agent for the oxidized molten steel.

When the dust 12 is charged into the electric furnace 20 (either a bucket charging method or another charging method may be used), a solid material as shown in FIG. 5 may be used, or as shown in FIG. You may throw in by the granular dust which has a crushed particle size distribution. In the case of a solid material, the dust 12 can be easily handled and transported.

FIG. 5 shows a solid material 30 produced by a twin-screw extruder or the like.
The dust is said to be.

FIG. 6 shows a crushed particle size distribution of granular dust.

In the solidification of the dust shown in FIG. 5, the shredder dust 12 may be mixed and solidified with lime, reducing slag or the like. Since it is desirable to add lime or reduced slag for refining, it is used to facilitate solidification of dust by solidifying it together with dust.

The shredder dust 12 by the lance
In addition to the air pressure, the oxygen pressure or the air-oxygen mixture gas pressure may be used to increase the amount of oxygen. Combustion is also accelerated.

Next, the operation will be described. The proportion of non-metals used in abandoned cars is increasing due to the trend toward lighter weight,
It has become about 20% by weight. The shredder dust 12 is obtained by cutting this into shreds of about 10 mm by shredding. This is put into the electric furnace 20 as it is, or after being solidified, or after being mixed and solidified with lime or the like.

In the electric furnace 20, combustible materials such as plastics in the shredder dust 12 are instantly completely burned by the high temperature atmosphere. In this case, chloride and sulfide are captured by lime or the like. Therefore, no offensive odor or harmful substances such as HCl are released.

The thermal energy generated when the plastics are burned is used for melting the iron scrap 16, so that the thermal energy is recovered. In addition, carbides that may be generated by burning plastics are used for molten steel reduction in refining.

[0022]

According to the present invention, the following effects are obtained. (B) Since it is an incineration method, the amount of dust disposed of in landfill can be reduced. (B) Since the heat generated during incineration can be used as a heat source, it can be expected to reduce the power source unit. (C) A carburizing effect can be seen and the molten steel peroxidation reaction can be reduced. (D) Since it is a high temperature reaction, C
l and S are captured, and the amount of harmful substances emitted into the atmosphere is reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment relating to a bucket charging method in the shredder dust incineration processing method of the present invention.

FIG. 2 is a schematic cross-sectional view of an embodiment relating to a method of dropping into a furnace by means of a chute in the shredder dust incineration processing method of the present invention.

FIG. 3 is a schematic cross-sectional view of an embodiment relating to a method of charging in a furnace by means of a pressure-feeding charging lance in the shredder dust incineration processing method of the present invention.

FIG. 4 is a schematic cross-sectional view of an example relating to a method of injecting into molten steel by means of a pressure feeding charging lance in the shredder dust incineration processing method of the present invention.

FIG. 5 is a shape of solid dust used in the method of the present invention.

FIG. 6 is a shape distribution diagram of crushed dust in the method of the present invention.

FIG. 7 is a characteristic table showing the relationship between addition of CaO (lime) and absorption of HCl and SO ₂ .

[Explanation of symbols]

 2 Scrap charging bucket 4 Chute 6 Pressure feeding charging lance 8 Pressure feeding charging lance 10 Molten steel 12 Shredder dust 14 Lime 16 Iron scrap 20 Electric furnace

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoriyuki Kuwahara 9-5, 4bancho, Chiyoda-ku, Tokyo Topy Industries Co., Ltd.

Claims (1)

[Claims] 1. Shredder dust generated by shredding an abandoned automobile or the like is incinerated as dust or mixed dust by utilizing molten steel in an electric furnace or a high temperature atmosphere. Incineration treatment method.