JPH0574558A - Induction heating type residue melting furnace - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to dissolve the high melting point residue and process it into sand-like particles to separate the metal components, and also to reuse the mineral particles as gravel laid on the road. it can. [Structure] A closed melting chamber 5 is arranged between the legs 3 of an inductor 1 in which a coil 4 is wound around a leg 3 of a U-shaped iron core 2, and a large number of graphite blocks 8 are arranged in the melting chamber 5.
And the incombustible residue 9 are stored, and the inert gas supply pipe 7
Attached, and forming the slats 10 at the bottom of the melting chamber 5,
A sealed water tank 2 is provided below this, and the graphite block 8 is induction-heated to indirectly heat and melt the incombustible residue 9 in contact therewith, and the melted residue is dropped into a water tank 12 and rapidly cooled in water,
The sandy solid matter 16 is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating type residue melting furnace for heating a graphite block to indirectly heat and melt the residue of an incombustible material to treat it with sand.

[0002]

2. Description of the Related Art Urban waste and industrial waste, which are increasing year by year,
Although it is incinerated to some extent in an incinerator such as a gas burner or a heavy oil burner, the incombustibles contained in this remain as a residue, and this residue is discarded in a dedicated dump, so it is necessary to secure a dump. It has become a major social problem as a land problem and pollution problem.

In such a conventional combustion type incinerator, an incinerator is put in a combustion chamber lined with a refractory material and heated by a combustion burner to incinerate, so that the incineration temperature is limited and metal and Since minerals cannot be incinerated, the amount of residue increases and the volume reduction rate is low, and as mentioned above, the dump site has been a problem.

Since the incombustible material which has become a residue as described above can be further reduced in volume by melting at a high temperature,
A method of melting in an electric furnace such as an arc furnace, a resistance furnace, a plasma furnace, or an oxygen reaction furnace has also been proposed. In this case, the residue to be melted is put into a crucible-shaped melting chamber constructed of bricks and irregular-shaped refractory materials and heated and melted, but the heating temperature must be 1700 ° C or lower, which is the refractory temperature of the refractory materials. .. In this way, there are metals as the residue with a melting point of 1700 ° C or less, but there are few metals contained in the incombustible residue residue, and most of them are mineral substances similar to furnace wall refractory materials. The high melting point residue of could not be melt processed.

Moreover, since the melting chamber has a crucible shape, there is a limit to the size of the crucible manufacturing technology, and the molten residue must be discharged in a liquid state, and the discharged molten residue is cooled to form a block. Since it solidifies to a small volume, the volume is reduced, but it cannot be used as it is, and there is a problem that the molten components cannot be separated.

[0006]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, dissolves a high melting point residue that could not be conventionally melted, and treats it as sandy particles to separate metal components. At the same time, the mineral particles provide an induction heating type residual melting furnace that can be reused as gravel laid on the road.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an inductor having a coil wound around a leg portion of a U-shaped iron core is provided with a hermetically sealed melting chamber between the both legs, and a large number of graphite particles are provided in the melting chamber. The present invention is characterized in that a block is housed, an inert gas supply pipe is attached, a sludge is formed at the bottom of the melting chamber, and a sealed water tank is provided at the bottom of this.

[0008]

In the residue melting furnace of the present invention, a mixture of the incombustible residue and the graphite block is put into the melting chamber, and then an inert gas is supplied from the high frequency power supply to the melting chamber while supplying the inert gas. An alternating current is applied to the coil wound around the leg of the U-shaped core to generate Joule heat in the graphite block.
As a result, the incombustible residue remaining in contact with the graphite block heated in the inert gas atmosphere and heated to a high temperature is also heated and melted. The molten incombustible residue is liquefied and dropped into the water in the water tank arranged below, where it is rapidly cooled and recovered as a sandy solid.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. In the figure, 1 is an inductor,
In this configuration, coils 4 and 4 are wound around both legs 3 and 3 of the U-shaped iron core 2, and the coil 4 is connected to a high frequency power source (not shown). Reference numeral 5 denotes a melting chamber which is arranged between the leg portions 3 and 3 around which the coil 4 is wound. The melting chamber 5 has a side wall 5a and a ceiling surface 5b formed of a carbon fiber refractory heat insulating board, and has a closed structure.

Further, as shown in FIG. 2, an uneven portion 6 is formed on the surfaces of the side surfaces 5a, 5a of the melting chamber 5 facing the coils 4, 4. Further, the ceiling surface 5b has an opening / closing structure, which serves as a charging port. Further, an inert gas supply pipe 7 such as argon gas is attached to the upper part of the melting chamber 5 so as to maintain the inside of the melting chamber 5 in an inert gas atmosphere.

In addition, a large number of graphite blocks 8 are mixed with the incombustible residue 9 in the melting chamber 5 and are introduced into the interior through an opening through which the ceiling surface 5b is opened. Also the melting chamber 5
As shown in Fig. 1, the bottom part of the drainboard 10 is made of graphite.
Is provided, and a water cooling beam 11 is attached to the bottom surface of the graphite slats 10 to cool the graphite slats 10.
Further, a sealed water tank 12 is provided in the lower portion of the melting chamber 5, and water 13 is stored therein, and the water tank 12 is detachably connected to the upper melting chamber 5 by a connecting tool 14.

In the induction heating type residue melting furnace, first, a water tank is used.
Put water 13 in 12, then put melting chamber 5 on top and connect
Connect together at 14. Next, the ceiling surface 5b of the melting chamber 5 is opened, and a mixture of the incombustible residue 9 and the graphite block 8 is charged from this charging port. Next, the melting chamber 5 is moved and installed between the leg portions 3 of the inductor 1.

Next, while supplying an inert gas such as argon gas from the inert gas supply pipe 7 into the melting chamber 5, an alternating current is passed through the coil 4 from a high frequency power source (not shown), the iron core legs 3 and 3 facing each other. A strong magnetic flux 15 is generated between them. This magnetic flux 15 penetrates the melting chamber 5 and links with the internal graphite block 8 so that an induced current flows, and eddy current loss is generated from the specific resistance of the graphite block 8 and the induced current to generate Joule heat to generate the graphite block. 8 heats up. As a result, the incombustible residue 9 in contact with the high temperature graphite block 8 is also indirectly heated, and since the inside of the melting chamber 5 is maintained in the inert gas atmosphere, the graphite block 8 does not undergo oxidative combustion and is 2000 ° C. It is possible to raise the temperature to some extent and melt most of the incombustible residue 9.

The molten incombustible residue 9 becomes a liquid and is dripped into the water 13 in the water tank 12 arranged below from the gap of the graphite sludge 10 and is rapidly cooled to become a sandy solid matter 16. in this case,
Since the melting point differs depending on the type of substance contained in the non-combustible residue 9, the obtained sandy solid substance 16 is formed to have substantially the same melting point. Since the solid matter 16 is formed, it can be effectively used by selecting it according to the difference in specific gravity. Further, since the side surface 5a of the melting chamber 5 is formed with the uneven portion 6, it is possible to prevent the eddy current of the induced current generated by the magnetic flux 15 interlinking with the side surface 5a and suppress the heat generation of the side surface 5a itself. It has become.

FIG. 3 shows another embodiment of the present invention.
Wheels are attached to the bottom of the water tank 12 equipped with a long rectangular melting chamber 5.
Prepare a plurality of units with 17 attached so that they can move, and slowly run the melting chamber 5 between the inductors 1 to melt the incombustible residue 9 in the melting chamber 5 sequentially along the longitudinal direction. I'm supposed to go. When melting is completed in one melting chamber 5, it is pulled out from the inductor 1 and the melting chamber 5 that is on standby is run inside the inductor 1 so that efficient processing can be performed without stopping the operation. ..

Although all of the above-mentioned embodiments have shown a batch type residual melting furnace, FIG. 4 shows a continuous type residual melting furnace in which a shooter 18 is connected to the side of the melting chamber 5,
A hopper 20 with a lid 19 attached is provided on top of this.
Other configurations are similar to those in FIG.

The lid 19 is opened, a mixture of the incombustible residue 9 and the graphite block 8 is first introduced from the hopper 20 and the graphite block 8 is fed into the melting chamber 5, after which only the incombustible residue 9 is left. And then the graphite block 8 is induction-heated to melt the incombustible residue 9. When the incombustible residue 9 melts and drops into the water tank 12 and the remaining amount decreases, the incombustible residue 9 in the shooter 18 slips and is sequentially supplied into the melting chamber 5 for continuous processing. You can do it.

[0018]

As described above, according to the present invention, a high melting point residue that could not be conventionally melted is melted by inductively heating the graphite block to a high temperature,
By rapidly cooling this in water to form a sandy solid, post-treatment can be facilitated, and metal components can be separated, and this can be reused as gravel laid on the road. Obtainable.

[Brief description of drawings]

FIG. 1 is a front view showing a melting chamber of an induction heating type residue melting furnace according to an embodiment of the present invention in a cutaway manner.

FIG. 2 is a horizontal sectional view of FIG.

FIG. 3 is a side view showing an induction heating type residue melting furnace according to another embodiment of the present invention.

FIG. 4 is a vertical sectional side view showing an induction heating type residue melting furnace according to another embodiment of the present invention.

[Explanation of sign]

 1 inductor 2 U-shaped iron core 3 leg 4 coil 5 melting chamber 6 uneven part 7 inert gas supply pipe 8 graphite block 9 incombustible residue 10 graphite sludge 11 water cooling beam 12 water tank 13 water 14 connector 15 magnetic flux 16 sandy solid 17 Wheels 18 Shooters 19 Lids 20 Hoppers

Claims (1)

[Claims] 1. An inductor in which a coil is wound around a leg portion of a U-shaped iron core is provided with a sealed melting chamber between the both legs, and a large number of graphite blocks are housed in the melting chamber and the inertness is maintained. An induction heating type residue melting furnace, characterized in that a gas supply pipe is attached, a drain is formed at the bottom of the melting chamber, and a sealed water tank is provided below this.