JP3088515B2 - Induction heating residue melting furnace - Google Patents

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 incombustibles to sandy treatment.

[0002]

2. Description of the Related Art Municipal garbage and industrial waste, which increase year by year,
Some incinerators, such as gas burners and heavy oil burners, are incinerated, but the incombustibles contained therein remain as residues, and the residues are discarded in dedicated dumps. It is a major social problem as a land problem and a pollution problem.

[0003] In such a conventional combustion type incinerator, the incineration material is put into a combustion chamber lined with refractory material and heated by a combustion burner for incineration. Since minerals cannot be incinerated, the amount of residue increases and the volume reduction rate is low, and as mentioned above, dumping has become a problem.

[0004] Since the non-combustible material that remains as such 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, or a plasma furnace, an oxygen reactor, or the like has also been proposed. In this case, the residue to be melted is thrown into a crucible-shaped melting chamber constructed of bricks and irregular-shaped refractory material and heated and melted, but the heating temperature must be 1700 ° C or less, which is the refractory temperature of the refractory material . As described above, there is a metal as a residue having a melting point of 1700 ° C or less, but among the incombustible residue, there are few metals and most are mineral substances similar to the furnace wall refractory material. Could not be melted.

Further, since the melting chamber is a crucible, the size of the crucible is limited in terms of the crucible manufacturing technique. The molten residue must be discharged in a liquid state. However, there is a problem that it cannot be used as it is and the molten component cannot be separated.

[0006]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, dissolves a high melting point residue which could not be melted conventionally, and treats it as sand-like particles to separate metal components. In addition, the present invention provides an induction heating type residue melting furnace in which mineral particles can be reused as gravel or the like laid on a road.

[0007]

According to the present invention, there is provided an inductor in which a coil is wound around a leg of a U-shaped iron core, a closed melting chamber is disposed between the two legs, and a large number of graphites are provided in the melting chamber. It is characterized in that the block is housed, an inert gas supply pipe is attached thereto, and a die is formed at the bottom of the melting chamber, and a sealed water tank is provided below this.

[0008]

In the residue melting furnace of the present invention, a mixture of incombustible residue and a graphite block is charged into a melting chamber, and then the inert gas is supplied from an inert gas supply pipe into the melting chamber while the core is supplied from a high frequency power supply. An alternating current is applied to the coil wound around the legs of the U-shaped iron core to generate Joule heat in the graphite block.
As a result, the non-combustible residue in contact with the graphite block heated to a high temperature in the inert gas atmosphere is also heated and melted. The molten incombustible residue becomes liquid and is dropped into water in a water tank disposed below, where it is quenched and recovered as a sandy solid.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. In the figure, 1 is an inductor,
In this embodiment, coils 4, 4 are wound around both legs 3, 3, of a 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 disposed between the two legs 3, 3 around which the coil 4 is wound. The melting chamber 5 has a closed structure in which a side surface 5a and a ceiling surface 5b are formed by a carbon fiber refractory heat insulating board.

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

In the melting chamber 5, a large number of graphite blocks 8 are mixed with the non-combustible residue 9 and injected into the interior through an inlet opening the ceiling surface 5b. Melting chamber 5
At the bottom of the slab is a graphite 10 made of graphite as shown in FIG.
A water cooling beam 11 is attached to the bottom surface of the graphite scale 10 to cool the graphite scale 10.
Further, a closed water tank 12 is provided at a lower portion of the melting chamber 5, and water 13 is stored therein. The water tank 12 is detachably connected to the upper melting chamber 5 by a connector 14.

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

Next, when an alternating current is applied to the coil 4 from a high-frequency power supply (not shown) while supplying an inert gas such as an argon gas into the melting chamber 5 from the inert gas supply pipe 7, the opposed iron core legs 3, 3 A strong magnetic flux 15 is generated in between. The magnetic flux 15 penetrates through the melting chamber 5 and interlinks with the graphite block 8 inside, so that an induced current flows, and an eddy current loss is generated from the specific resistance of the graphite block 8 and the induced current, thereby generating Joule heat to generate the graphite block. 8 generates heat. 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 an inert gas atmosphere, the graphite block 8 does not oxidize and burn at 2000 ° C. By raising the temperature to the extent, most of the non-combustible residue 9 can be melted.

The melted incombustible residue 9 becomes liquid and drops into the water 13 of the water tank 12 disposed below from the gap between the graphite chips 10, where it is rapidly cooled to a sand-like solid 16. in this case,
Since the melting point differs depending on the type of the substance contained in the incombustible residue 9, the obtained sand-like solid 16 is formed with almost the same melting point. Since the solids 16 are in the form of solids, they can be effectively used by sorting them out 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, the eddy current of the induced current generated by the magnetic flux 15 interlinking with the side surface 5a can be prevented, and the heat generation of the side surface 5a itself can be suppressed. It has become.

FIG. 3 shows another embodiment of the present invention.
Wheels on the bottom of the water tank 12 with the long rectangular melting chamber 5
A plurality of units which can be moved by attaching 17 are prepared, and the melting chamber 5 is slowly moved between the inductors 1 to sequentially melt the incombustible residue 9 in the melting chamber 5 along the longitudinal direction. I'm going to go. When the melting in one melting chamber 5 is completed, the melting chamber 5 is drawn out of the inductor 1 and the other waiting melting chamber 5 is moved into the inductor 1 so that the processing can be efficiently performed without stopping the operation. .

In each of the above embodiments, a batch type residue melting furnace is shown. FIG. 4 shows a continuous type residue 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 to this upper part is provided.
Other configurations are the same as those in FIG.

In this method, the lid 19 is opened, and a mixture of the non-combustible residue 9 and the graphite block 8 is first charged from the hopper 20 and the graphite block 8 is sent into the melting chamber 5. And then the graphite block 8 is induction-heated to melt the non-combustible residue 9. When the incombustible residue 9 is melted and dropped into the water tank 12 to reduce the remaining amount, the incombustible residue 9 in the shooter 18 slides and is sequentially supplied into the melting chamber 5 to be continuously processed. I can do it.

[0018]

As described above, according to the present invention, a high melting point residue which could not be melted conventionally is melted by indirectly heating the graphite block to a high temperature by induction heating the graphite block.
An induction heating type residue melting furnace that quenches this in water to make it a sandy solid, facilitates post-treatment, separates metal components, and reuses it as gravel laid on roads. Obtainable.

[Brief description of the drawings]

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

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.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Inductor 2 U-shaped iron core 3 Leg part 4 Coil 5 Melting chamber 6 Irregularity part 7 Inert gas supply pipe 8 Graphite block 9 Non-combustible residue 10 Graphite slender 11 Water cooling beam 12 Water tank 13 Water 14 Connector 15 Magnetic flux 16 Sandy solids 17 Wheels 18 Shooter 19 Lid 20 Hopper

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI C22B 7/04 C22B 7/04 A 9/22 9/22 (58) Field surveyed (Int.Cl. ⁷ , DB name) F23G 5/00 F23J 1/00 F27D 11/06 C22B 7/00-7/04 C22B 9/22 H05B 6/10

Claims (1)

(57) [Claims] 1. An inductor in which a coil is wound around legs of a U-shaped iron core, a sealed melting chamber is disposed between the legs, and a large number of graphite blocks are accommodated in the melting chamber and inert. An induction-heating residue melting furnace, comprising: a gas supply pipe attached thereto; a bottom formed in a melting chamber; and a sealed water tank provided below the melting chamber.