JPH07243767A - Melting treatment furnace for waste consisting principally of dust - Google Patents

Abstract

PURPOSE:To facilitate the movement, replacement or adding of an electrode by a method wherein a main electrode is inserted into a furnace from the upper part thereof, a non- electroconductive bulkhead, partitioning the molten salt layer of an upper layer between the main electrodes, is equipped in the furnace and a melting starting agent charging port and auxiliary electrodes are provided in every furnace units partitioned by the bulkhead. CONSTITUTION:A waste charging port 61a, a melting starting agent charging port 71a and an exhaust port 81a are opened on a furnace lid 21, forming a first chamber 41a, while another melting starting agent charging port 71b and another exhaust port 81b are opened on the furnace lid 21, forming a second chamber 41b. A molten salt discharging port 91a is opened on the upper part of a left side wall 11a while a molten slag discharging port 101a is opened on the upper part of a right wide wall 11b. A main electrode 111a is inserted while penetrating the furnace lid 21 between the melting starting agent charging port 71a and the exhaust port 81a while a main electrode 111b is inserted between the melting starting agent charging port 71b and the exhaust port 81b. Further, an auxiliary electrode 121a is inserted between the waste charging port 61a and the melting starting agent charging port 71a while an auxiliary electrode 121b is inserted into the left side of the melting starting agent charging port 71b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to dust (fly ash) generated when incinerating municipal waste, dust (fly ash) generated when melting incineration ash of urban garbage, and part of the dust in the city. The present invention relates to a melting treatment furnace for waste mainly containing dust, such as one to which waste incineration ash is added. Since the dust contains high concentrations of salt, heavy metals, etc., it cannot be discarded as it is. Therefore, the waste mainly composed of dust is melted and solidified by using a melting treatment furnace, and a part of the waste is effectively used, and the volume is reduced and stabilized, and then the waste is discarded.
The present invention relates to an improvement of such a melt processing furnace.

[0002]

2. Description of the Related Art Conventionally, as a waste melting treatment furnace mainly composed of dust, a waste input port, an exhaust port, a molten salt discharge port,
A molten slag discharge port and an electrode are provided, the electrode is horizontally inserted from the side wall of the furnace body into the furnace, and the entire in-furnace portion of the electrode is immersed in the molten slag layer formed in the lower layer in the furnace. The one formed as described above is used (Japanese Patent Laid-Open No. 58-58).
-30382, JP-A-60-54780, JP-A-60-
103213, JP-A-60-263007). In such a conventional melting treatment furnace, in general, when the melting treatment of the waste mainly consisting of dust is stopped for some reason and restarted, after inserting the burner into the furnace and melting the slag solidified by the combustion flame, Electrodes are inserted into the molten slag layer and electricity is applied between the electrodes.

However, in the conventional melting treatment furnace as described above, since the electrode is inserted into the furnace from the side wall of the furnace main body at a position facing the molten slag layer in the horizontal direction, the electrode and the side wall of the furnace main body are separated from each other. In addition to the drawbacks that the seal structure between them is extremely complicated, and especially the movement of the electrode position, the replacement and replacement of the electrodes are very troublesome, and the burner and fuel gas supply to the burner in preparation for restarting the melting process. There is the drawback that equipment, combustion air supply equipment to the burner and exhaust gas treatment equipment to be generated are required.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that in the conventional waste melting furnace mainly composed of dust, the sealing structure between the electrode and the side wall of the furnace body is remarkably complicated. In addition, it is very difficult to move the electrode position, replace the electrodes, and reconnect the electrodes. In addition, in order to restart the melting process, complicated auxiliary equipment related to the burner is required.

[0005]

DISCLOSURE OF THE INVENTION The present invention, however, is directed to a waste melting furnace having a waste charging port, an exhaust port, a molten salt discharging port, and a molten slag discharging port, and a main electrode in the furnace. Inserted from above, the furnace is equipped with a substantially non-electrically conductive partition wall that separates the upper molten salt layer between the main electrodes, and melting starts for each furnace unit partitioned by the partition wall. The present invention relates to a waste melting treatment furnace mainly composed of dust, which is equipped with an agent inlet and an auxiliary electrode.

The melting treatment furnace of the present invention is provided with a waste inlet, an exhaust outlet, a molten salt outlet, and a molten slag outlet, and the downstream side of the outlet is connected to a dust collector, such as a bag filter. They are connected and the main electrode is inserted into the furnace from above. The main electrode may be connected to a DC power supply or an AC power supply, and the AC power supply may be single-phase or three-phase. The number of main electrodes connected to the same power supply terminal may be one or two or more, but the main electrodes connected to the same power supply terminal are in the same chamber formed by the partition wall. insert.
These main electrodes are usually inserted through the furnace lid vertically into the furnace from above the furnace, but penetrate the upper part of the side wall of the furnace lid or the furnace main body and obliquely face down from above the furnace, preferably the furnace. It may be inserted into the furnace toward the center of the.

When the waste mainly consisting of dust is melted by resistance heating in a melting furnace, a molten slag layer is formed in the lower layer in the furnace and a molten salt layer is formed in the upper layer in the furnace due to the difference in specific gravity. . When the main electrode is inserted into the furnace from above the furnace, that is, when the main electrode is inserted so as to penetrate the molten salt layer in the upper layer and its tip is immersed in the molten slag layer in the lower layer, the electrical conductivity is lower layer. Since the upper molten salt layer is much higher than the molten slag layer, the current can short-circuit between the main electrodes through the upper molten salt layer, thus heating the lower molten slag layer to a given temperature. Difficult, smooth discharge of molten slag, and smooth melting of waste cannot be achieved.

In the above case, a large current is passed between the main electrodes,
It is also possible to heat the lower molten slag layer to a predetermined temperature, but if this is done, the upper molten salt layer will reach an abnormally high temperature, salt evaporation and decomposition will occur, and the molten salt will be separated and recovered effectively. It cannot be used, and the dust collector is overloaded, which is extremely uneconomical in the first place.

The melt processing furnace of the present invention is equipped with a substantially non-electrically conductive partition wall for partitioning an upper molten salt layer between main electrodes in the furnace. The partition wall separates the upper molten salt layer, that is, it penetrates the upper molten salt layer and its tip (lower end) is immersed in the lower molten slag layer, and therefore the partition wall The end (upper end) is located above the liquid level of the molten salt layer in the upper layer of the furnace discharged from the molten salt discharge port, and the tip (lower end) of the partition wall is higher than the molten salt discharge port. It is located below the liquid level of the molten slag layer of the lower layer in the furnace discharged from the molten slag discharge port below. The partition wall separates the upper molten salt layer and the upper portion of the lower molten slag layer, but does not partition the middle and lower portions of the molten slag layer, and these middle and lower portions are in communication. . The upper wall of the molten salt layer is partitioned between the main electrodes by the partition wall to prevent current from short-circuiting between the main electrodes via the upper layer of molten salt, and the molten slag of the lower layer without flowing a large current between the main electrodes. The layer is heated to a given temperature.

The partition wall is constructed of a substantially non-electrically conductive normally refractory material, preferably a refractory material having a jacket for cooling. The partition wall may be attached to the furnace lid or may be attached to the side wall of the furnace body.

By the way, when the waste mainly consisting of dust is melt-processed using the above-mentioned melt-processing furnace in which the main electrodes are partitioned by the partition wall, when the melt-processing is stopped and restarted for some reason, When the solidified slag is lower than the partition wall, the melting initiator is put in the upper part of the slag, and the main electrodes are embedded in the melting initiator, and current is applied between the main electrodes to solidify. The molten slag can be sequentially melted from the upper portion thereof, and along with this, the main electrode can be sequentially inserted into the molten slag layer to restart the melting process. Such a method of restarting the operation is also performed in the above-described conventional melt processing furnace, that is, in the melt processing furnace in which the partition wall is not provided in the furnace and the electrodes are horizontally inserted into the furnace ( JP-A-60-263007). However, when the solidified slag is higher than the partition wall, the solidified insulating slag and the partition wall provide insulation between the main electrodes,
Even with the above configuration, the slag solidified by energizing the main electrodes cannot be melted, and therefore the melting process cannot be restarted.

The melting treatment furnace of the present invention is equipped with a melting initiator charging port and an auxiliary electrode for each furnace unit partitioned by a partition wall. When the inside of the furnace is divided by the partition into the first chamber and the second chamber, the first chamber and the second chamber are equipped with the melting initiator charging port and the auxiliary electrode, respectively, and the inside of the furnace is divided by the partition. When partitioned into the first chamber, the second chamber, and the third chamber, the first chamber, the second chamber, and the third chamber are equipped with a melting initiator charging port and an auxiliary electrode, respectively. For the melting initiator charging port, for example, a dedicated melting initiator charging port may be opened in the furnace lid, or the waste charging port may also be used. The auxiliary electrode penetrates through the upper portion of the side wall of the furnace lid or the furnace body, is obliquely downward from the upper side of the furnace, and is vertically movable as in the case of the main electrode.

When the melting process is stopped and restarted for some reason, the melting initiator is charged into the furnace through the melting initiator charging port for each unit in the furnace partitioned by the partition wall. The main electrode and the auxiliary electrode are buried in. Then, in this state, each electrode is switched and connected to the main power source or an auxiliary power source equipped separately separately for each in-furnace unit partitioned by the partition wall, electricity is passed between the electrodes, and remelting is sequentially performed from the top of the solidified slag. To do. The inside of the furnace is partitioned by a partition into a first chamber and a second chamber,
When the first chamber and the second chamber are equipped with one main electrode and one auxiliary electrode, respectively, during the normal melting process, in addition to the main power source to which these two main electrodes in total are connected, an auxiliary power source The main electrode and the auxiliary electrode are switched and connected to an auxiliary power source by a switch operation in each of the first chamber and the second chamber, and electricity is supplied between the main electrode and the auxiliary electrode.
In this case, the auxiliary power source is omitted, and in each of the first chamber and the second chamber, the main electrode and the auxiliary electrode are switched and connected to the main power source by switch operation, and electricity is supplied between the main electrode and the auxiliary electrode. You can also When the inside of the furnace is partitioned by a partition into a first chamber and a second chamber, and each of the first chamber and the second chamber is equipped with two or more main electrodes and one or two or more auxiliary electrodes, Further, the inside of the furnace is partitioned by a partition into a first chamber, a second chamber and a third chamber, and each of the first chamber, the second chamber and the third chamber is equipped with one main electrode and one auxiliary electrode. The same applies to the case.

In the present invention, when melting waste mainly consisting of dust, in order to further reduce evaporation of salts and heavy metals, a covering layer of waste mainly consisting of dust is further provided as an upper layer of the molten salt layer in the furnace. Are preferably formed. In addition, when the waste mainly consisting of dust with a large amount of metal is melted, a molten metal layer is formed under the molten slag layer in the furnace. It is preferable to open a molten metal discharge port on the side wall or the bottom wall of the furnace body below.

[0015]

In the melting treatment furnace of the present invention, since the electrode is inserted into the furnace from above the furnace, the electrode is inserted into the furnace from the horizontal direction facing the molten slag layer below the furnace. Compared to the processing furnace, it is not necessary to consider the sealing structure between the electrode and the furnace lid or the furnace body, and it is particularly easy to move the electrode position, replace the electrode, and add the electrode. In addition, since the upper layer of molten salt layer is partitioned between the electrodes by the partition wall, it is possible to prevent the current from short-circuiting between the electrodes through the upper layer of molten salt, and therefore the lower layer is melted without flowing a large current between the electrodes. The slag layer can be heated to a predetermined temperature.

During the normal melting process, the molten slag layer is formed in the lower layer in the furnace, the molten salt layer is formed in the upper layer in the furnace, and the tip of the main electrode is immersed in the molten slag layer. There is. When the melting process is stopped for some reason, the main electrode is pulled up. Then, when the melting process is restarted, the melting initiator is charged into the furnace through the melting initiator charging port for each unit in the furnace partitioned by the partition wall, and the main electrode and the auxiliary electrode are placed in the melting initiator. In the buried state, each electrode is switched and connected to the main power supply or the auxiliary power supply by switch operation, and electricity is supplied between the electrodes. By energizing, the solidified slag is remelted sequentially from the upper part, so that each electrode is sequentially lowered along with this, and the solidified slag is remelted at least below the partition wall, then the auxiliary electrode is pulled up, and the switch operation is performed. The main electrode is switched back to the main power supply and connected again to restart the melting process. According to the present invention, it goes without saying that the solidified slag is at a lower level than the partition wall, and when the solidified slag is at a higher level, the melting process can be restarted by the above-described simple operation. No complicated burner-related auxiliary equipment is required for restarting the melting process.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional view showing a first embodiment of the present invention, showing a state in which the melting process is restarted. A furnace lid 21 is attached to the left side wall 11a, the right side wall 11b of the furnace main body 11 and the upper ends of front and rear side walls (not shown), and a partition wall 31 is attached to the furnace cover 21. It is joined to front and rear side walls (not shown) of 11. A first chamber 41a partitioned by a partition wall 31 is provided above the furnace.
And the second chamber 41b are formed, and the lower part of the furnace is not partitioned by the partition wall 31 and communicates with each other. During a normal melting process, in the first chamber 41a and the second chamber 41b, a covering layer is formed on the uppermost layer, a molten salt layer is formed on the upper layer, and a molten slag layer is further formed on the lower layer. Communicates with the first chamber 41a and the second chamber 41b, and the tip (lower end) of the partition wall 31 is immersed in the upper portion of the molten slag layer. In FIG. 1, the partition wall 31 is mounted on the furnace lid 21, but the partition wall can also be mounted on upper portions of front and rear side walls (not shown) of the furnace body 11.

The furnace lid 21 forming the first chamber 41a has a waste inlet 61a, a melting initiator inlet 71a and an exhaust port 8.
1a, and the furnace lid 21 forming the second chamber 41b is provided with a melting initiator charging port 71b and an exhaust port 81b. A molten salt discharge port 91a is provided above the left side wall 11a of the furnace body 11 forming the first chamber 41a, and the right side wall 1 of the furnace body 11 is below the molten salt discharge port 91a.
A molten slag discharge port 101a is opened above 1b. During the normal melting process, the upper molten salt layer is discharged by overflow from the molten salt discharge port 91a, and the lower molten slag layer is discharged from the molten slag discharge port 101a.

The main electrode 111a penetrates through the furnace lid 21 which forms the first chamber 41a between the melting initiator charging port 71a and the exhaust port 81a, and the melting initiator charging port 71b and the exhaust port 8 are provided.
1b, the main electrode 111b is inserted into each chamber by penetrating the furnace lid 21 forming the second chamber 41b, and further between the waste charging port 61a and the melting initiator charging port 71a. The auxiliary electrode 121a penetrates through the furnace lid 21 that forms the first chamber 41a, and the auxiliary electrode 121a is located on the right side of the melting initiator charging port 71b.
The auxiliary electrode 121 is penetrated through the furnace lid 21 forming the chamber 41b.
b is inserted in each chamber. During the normal melting process, the base end portions of the main electrodes 111a and 111b are connected to the main power source 131 which is an AC single-phase power source, and the front end portions (lower end portions) of the main electrodes 111a and 111b form a molten slag layer. Although it is immersed, the auxiliary electrodes 121a and 121b are pulled up.

When the melting process is stopped for some reason,
The main electrodes 111a and 111b are pulled up. Then, when the melting process is restarted, the first chamber 41 partitioned by the partition wall 31
In each of the a and the second chamber 41b, the melting initiators 141a and 141b are supplied from the melting initiator input ports 71a and 71b.
Is charged, and the main electrodes 11 are added to the melting initiators 141a and 141b.
1a, 111b and the respective tip portions of the auxiliary electrodes 121a, 121b are buried. In this state, switch operation
The main electrode 111a and the auxiliary electrode 121a are switched and connected to an auxiliary power supply 151a which is an AC single-phase power supply, and the main electrode 111b and the auxiliary electrode 121b are switched and connected to an auxiliary power supply 151b which is an AC single-phase power supply. In each of the first chamber 41a and the second chamber 41b, electricity is applied between the electrodes.

The salt 16 solidified by energization between the electrodes
Since the slag 171 solidified together with 1a is sequentially remelted from the upper portion, each electrode is sequentially lowered accordingly, and the solidified slag is remelted at least below the partition wall 31 and then the auxiliary electrodes 121a and 121b are pulled up. , The main electrodes 111a and 111b are again switched and connected to the main power source 131 by the switch operation, and the melting process is restarted.

FIG. 2 is a vertical sectional view showing a second embodiment of the present invention, and FIG. 3 is a transverse sectional view schematically showing the same second embodiment as in FIG. Shows the state of. A furnace lid 22 is attached to the left side wall 12a, the right side wall 12b of the furnace body 12 and the upper ends of front and rear side walls (not shown), and a partition wall 32 is hung on the furnace lid 22 with a connecting member 32a. The partition walls 32 are joined to front and rear side walls (not shown) of the furnace body 12. A first chamber 42a and a second chamber 42b partitioned by a partition wall 32 are formed above the furnace.
The first chamber 42a and the second chamber 42b communicate with each other above them, and the lower part inside the furnace is not partitioned by the partition wall 32 but communicates therewith. During the normal melting process, the first chamber 42a
In the second chamber 42b, the covering layer is formed on the uppermost layer, the molten salt layer is formed on the upper layer, and the molten slag layer is further formed on the lower layer. The molten slag layer is formed on the first chamber 42a and the second chamber 42b.
It communicates with the chamber 42b, and the tip (lower end) of the partition wall 32 is immersed in the upper portion of the molten slag layer. In FIG. 2, the partition wall 32 is suspended from the furnace lid 22, but the partition wall may be mounted on the upper part of the front and rear side walls (not shown) of the furnace body 12.

The furnace lid 22 forming the first chamber 42a has a waste inlet 62a and an exhaust port 82a, and the second chamber 42b.
The furnace lid 22 that forms the furnace has a waste input port 62b and an exhaust port 82b, respectively.
Melting initiator injection ports 72a and 72b are connected to a and 62b. A molten salt discharge port 92a is provided above the left side wall 12a of the furnace body 12 forming the first chamber 42a, and a molten salt discharge port 92b is also provided above the right side wall 12b of the furnace body 12 forming the second chamber 42b. The molten slag discharge ports are opened in the upper part of the rear side wall (not shown) of the furnace body 12 below the molten salt discharge ports 92a and 92b opened in the same area. During the normal melting process, the upper molten salt layer is discharged from these molten salt discharge ports 9
2a and 92b are discharged by overflow,
The lower molten slag layer is discharged from a molten slag discharge port on the rear side wall (not shown). In FIG. 2, exhaust ports 82a and 82b are provided in the first chamber 42a and the second chamber 42b, respectively, but since the upper portions of the first chamber 42a and the second chamber 42b communicate with each other, these exhaust ports are One of them can be omitted.

Two main electrodes 112a and 112b penetrate the furnace lid 22 forming the first chamber 42a between the waste input port 62a and the exhaust port 82a, and the waste input port 62b and the exhaust port 82b. Furnace lid 22 forming a second chamber 42b between
The main electrodes 112c and 112d are inserted into the respective chambers, and further on the left side of the waste input port 62a.
The auxiliary electrode 122 is penetrated through the furnace lid 22 forming the chamber 42a.
The auxiliary electrode 122b is inserted into each chamber by passing a through the furnace lid 22 that forms the second chamber 42b on the right side of the waste input port 62b. During the normal melting process,
The base ends of the main electrodes 112a to 112d are connected to a main power supply 132 that is an AC single-phase power supply, and the main electrodes 112a to 112d are connected to the main power supply 132.
The tip portion (lower end portion) of 112d is immersed in the molten slag layer, but the auxiliary electrodes 122a and 122b are pulled up.

When the melting process is stopped for some reason,
The main electrodes 112a to 112d are pulled up. When restarting the melting process, the first chamber 42 partitioned by the partition wall 32
In each of the a and the second chamber 42b, the melting initiators 142a and 142b are charged from the melting initiator charging ports 72a and 72b through the waste charging ports 62a and 62b, and the main electrodes 112a to 142b are charged to the melting initiators 142a and 142b. The tip portions of 112d and the auxiliary electrodes 122a and 122b are buried. In this state, by operating the switch, the main electrode 112
a, 112b and the auxiliary electrode 122a are switched and connected to the auxiliary power supply 152a which is an AC single-phase power supply, and the main electrode 1
12c, 112d and the auxiliary electrode 122b are switched and connected to the auxiliary power supply 152b which is an AC single-phase power supply, and the main electrode 1 is provided in each of the first chamber 42a and the second chamber 42b.
Power is supplied between the electrodes 12a and 112b and the auxiliary electrode 122a, and between the main electrodes 112c and 112d and the auxiliary electrode 122b.

The salt 16 solidified by energization between the electrodes
Since the slag 172 solidified together with 2a and 162b is sequentially remelted from the upper part, each electrode is sequentially lowered accordingly, and the solidified slag is remelted at least below the partition wall 32, and then the auxiliary electrodes 122a and 122b.
The main electrodes 112a to 11a
2d is again switched and connected to the main power source 132 to restart the melting process.

FIG. 4 is a vertical cross-sectional view showing a third embodiment of the present invention, showing a state in which the melting process is restarted. A furnace lid 23 is attached to the left side wall 13a and the right side wall 13b of the furnace body 13 and upper ends of front and rear side walls (not shown), and partition walls 33a and 33b are attached to the furnace lid 23. A first chamber 43a partitioned by a partition wall 33a, a second chamber 43b partitioned by a partition wall 33a and a partition wall 33b, and a third chamber 43c partitioned by a partition wall 33b are formed above the furnace. The lower part is not partitioned by the partition walls 33a and 33b, but communicates with each other. During the normal melting process, in the first chamber 43a and the third chamber 43c, a covering layer is formed on the uppermost layer, a molten salt layer is formed on the upper layer, and a molten slag layer is formed on the lower layer. First room 4
3a, 2nd chamber 43b, and 3rd chamber 43c are connected, and the tip part (lower end part) of partition walls 33a and 33b is immersed in the upper part of the molten slag layer.

The furnace lid 23 forming the first chamber 43a has a waste inlet 63a and an exhaust port 83a, and the second chamber 43b.
The furnace lid 23 that forms the
The furnace lid 23 forming 3c is provided with a waste input port 63c and an exhaust port 83c, respectively.
3a and 63c are connected to melting initiator charging ports 73a and 73c, and a melting initiator charging port 73b is opened in the furnace lid 23 forming the second chamber. A molten salt discharge port 93a is provided above the left side wall 13a of the furnace body 13 forming the first chamber 43a, and a molten salt discharge port 93c is also provided above the right side wall 13b of the furnace body 13 forming the third chamber 43c. The molten slag discharge ports are provided above the unillustrated rear side wall of the furnace body 13 below the molten salt discharge ports 93a and 93c opened in the same area. During normal melting processing, the upper molten salt layer is discharged by overflow from these molten salt discharge ports 93a and 93c, and the lower molten slag layer is discharged from the molten slag discharge port on the rear side wall (not shown).

The main electrode 1 is penetrated through the furnace lid 23 forming the first chamber 43a between the waste input port 63a and the exhaust port 83a.
13a is a melting initiator charging port 73b and an exhaust port 83b.
Through the furnace lid 23 forming the second chamber 43b between the main electrode 113b, the waste charging port 63c and the exhaust port 83.
The main electrode 113c is inserted into each chamber by penetrating the furnace lid 23 forming the third chamber 43c with the chamber c and further forming the first chamber 43a on the left side of the waste input port 63a. A furnace lid 23 that penetrates 23 to form an auxiliary electrode 123a and also forms a second chamber 43b on the left side of the melting initiator charging port 73b.
The auxiliary electrode 123b through the
Auxiliary electrodes 123c are inserted into the respective chambers through the furnace lid 23 forming the third chamber 43c on the left side of c. During the normal melting process, the main electrodes 113a, 113b,
The base end of 113c is connected to a main power supply 133, which is an AC three-phase power supply, and is connected to the main electrodes 113a, 113b, 113.
The tip portion (lower end portion) of c is immersed in the molten slag layer, but the auxiliary electrodes 123a, 123b, 123c are pulled up.

When the melting process is stopped for some reason,
The main electrodes 113a to 113c are pulled up. Then, when the melting process is restarted, in each of the first chamber 43a, the second chamber 43b, and the third chamber 43c partitioned by the partition walls 33a, 33b, from the melting initiator charging ports 73a, 73c to the waste charging ports 63a, 63c. Through the melting initiator charging port 73b, and the melting initiators 143a to 143c are charged.
Main electrodes 113a to 11 are added to the melting initiators 143a to 143c.
3c and the respective tip portions of the auxiliary electrodes 123a to 123c are buried. In this state, by operating the switch, the main electrode 11
3a to 113c are auxiliary power sources 153a which are AC single-phase power sources.
To 153c, the first chamber 43a, the second chamber
In each of the chamber 43b and the third chamber 43c, electricity is applied between the electrodes.

The salt 16 solidified by energization between the electrodes
Since the slag 173 solidified together with 3a and 163c are sequentially remelted from the upper part, each electrode is sequentially lowered accordingly, and thus the solidified slag is at least separated by the partition wall 33a,
After remelting to a lower level than 33b, the auxiliary electrode 123a
~ 123c is pulled up and the main electrode 11 is operated by a switch operation.
3a to 113c are again switched and connected to the main power source 133 to restart the melting process.

[0032]

As is apparent from the above, according to the present invention described above, it is not necessary to particularly consider the sealing structure between the electrode and the furnace lid or the furnace body. In addition to the effect that the molten slag layer can be heated to a predetermined temperature without flowing a large current between the electrodes, the burner-related complicated No additional equipment is required, and the melting process can be restarted with a simple operation.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is a transverse cross-sectional view schematically showing the same second embodiment as in FIG.

FIG. 4 is a longitudinal sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

11-13 ... Furnace body, 21-23 ... Furnace lid, 31
-33b ... Partition walls, 61a-63c ... Waste input port, 71a-73c ... Melting initiator input port, 81a-
83c ... Exhaust port, 91a-93c ... Molten salt discharge port, 101a ... Molten slag discharge port, 111a-11
3c ... Main electrode, 121a-123c ... Auxiliary electrode, 131-133 ... Main power supply, 141a-143c
... Melting initiator, 151a-153c ... Auxiliary power source, 171-173 ... Solidified slag

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F23G 5/00 ZAB 115 B F27B 3/04 3/18 3/19 3/20 F27D 11/04 7727 -4K

Claims (3)

[Claims] 1. A waste melting treatment furnace comprising a waste input port, an exhaust port, a molten salt discharge port, and a molten slag discharge port, wherein a main electrode is inserted into the furnace from above. Is equipped with a substantially non-electrically conductive partition wall for partitioning the upper molten salt layer between the main electrodes, and each reactor unit partitioned by the partition wall is equipped with a melting initiator inlet and an auxiliary electrode. A waste melting furnace mainly consisting of dust. 2. A melting furnace for waste mainly comprising dust as claimed in claim 1, further comprising an auxiliary power source switchably provided between the auxiliary power source and the main power source. 3. A waste melting treatment furnace mainly comprising dust according to claim 1, further comprising a molten metal discharge port.