JPH09101399A - Method for melting waste and method and decomposer for melting, oxidizing and decomposing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an efficient and quick melting treatment of wastes and make is possible to carry out the melting treatment of nonflammable wastes separately or carry out an efficient melting treatment of the nonflammable wastes and the oxidizing and decomposing treatment of flammable and/or incombustible wastes collectively and rationally by directly heating molten nonflammable wastes at all times with a high-temperature heating heat source. SOLUTION: Nonflammable wastes 61 and flammable and/or incombustible wastes 62 are respectively supplied to a melting area 42 and an oxidizing and decomposing area 43 in a melting, oxidizing and decomposing reactor 40. The nonflammable wastes 61 supplied to the melting area on one side are melted by a high-temperature heating heat source, and the melts of them are discharged to the oxidizing and decomposing area 43 on the other side and are maintained there. Additionally, the flammable and/or incombustible wastes 62 supplied to the oxidizing and decomposing area 43 are oxidized and decomposed on the melts by the high-temperature heating heat source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melting method, a non-combustible miscellaneous method for reducing the volume of waste, particularly non-combustible miscellaneous solid waste such as low-level radioactive miscellaneous solid waste generated from a nuclear power plant. The present invention relates to a melting / oxidizing / decomposing method and a melting / oxidizing / decomposing furnace for reducing the volume of solid waste and combustible and / or flame-retardant miscellaneous solid waste.

[0002]

2. Description of the Related Art Conventionally, there are an electric system and a fossil fuel system in a facility for melting municipal incineration ash. There are plasma heating furnaces, arc heating furnaces, resistance heating furnaces, and low-frequency heating furnaces as electric systems, and rotary surface heating furnaces as fossil fuel systems.
There are fixed surface heating furnaces, self-combustion heating furnaces, and coke bed heating furnaces. There are various types such as those under experiment, under demonstration, under construction, and put into practical use. Although all of these melting facilities have merits and demerits, they are regarded as promising because the plasma heating furnace can melt the refuse incineration ash in a short time by the plasma arc of very high temperature and is efficient.

Further, not only the melting of municipal waste incineration ash, but also the melting volume of non-combustible waste such as low-level radioactive miscellaneous solid waste, industrial waste, etc. is promising. Has been. As shown in FIG. 9, a basic plasma melting furnace is equipped with a plasma torch 1 in an upper furnace shell 2 and the lower furnace shell 3 is lined with bricks 4 for heat insulation, and a base metal 5 is held on the bricks. A waste charging guide tube 6 is provided in the center of the upper furnace shell 2, a tap hole 7 is provided on the side of the lower furnace shell 3, a stirring coil 8 is provided on the outside of the bottom, and the entire furnace shell has a water cooling structure. The non-combustible waste 9 is supplied from the guide cylinder 6 to the molten pool 10 of the base metal 5 which has been melted and held in advance by the canned drum, and is melted by the arc 11 of the plasma torch 1 and melted. The material is made to overflow and discharged from the outlet 7 (as a prior art document, "Thermal Nuclear Power Generation" Vo issued in October 1984).
l 35, No. There is a plasma melting furnace described in P30 of No. 6).

As a structural concept of the plasma melting test furnace, the one shown in FIG. 10 has been proposed. This is done by flattening the bottom 16 of the furnace main body 15, obliquely penetrating the upper wall 17 of the furnace main body 15, and providing a plasma torch 18 so that it can be taken in and out by a drive device 19. An electrode 20 is provided, a waste material supply port 22 is provided at a middle height portion of a side wall 21 of the furnace body 15, an exhaust gas duct 23 is provided below the side wall 21, and a side wall 24 adjacent to the side wall 21 in a right angle direction.
A tap hole 25 is provided at the lower part of the table and is normally closed with a lid 26. The bottom surface of the end of the furnace body 15 on the side of the tap hole 25 is pivotally supported on the upper end of the support column 27, and the bottom surface of the opposite end is mounted on the upper end of the support column 28, and a bracket 29 provided on the upper outer surface of the end section. The upper end of the furnace body tilting device 30 is pivotally supported on the upper end of the furnace body tilting device 30 and the lower end of the furnace body tilting device 30 is pivotally supported on the support base 31.
2 is supplied to the inside of the furnace main body 15 through the supply port 22 in a state of being removed, is melted by the arc of the plasma torch 18, the lid 26 is opened, and the furnace main body 15 is tilted by the furnace body tilting device 30 and discharged. Emitted from the sprue 25 (as prior art documents, Journal of Plasma and Fusion Research, Vol. 70, No. 5, 19
In May 1994, there is "5. Melting of incinerated ash by plasma" described on pages 479 to 487).

[0005]

By the way, in the above-mentioned conventional plasma melting furnace and plasma melting test furnace, in the region where non-combustible waste was supplied until the melting process was completed,
Since the molten material is retained, the unmelted incombustible waste is covered with the molten metal, and the direct heating by the plasma arc cannot be performed, so that the melting efficiency is reduced. In addition, in order to efficiently heat non-combustible waste, it is necessary to limit the melting area of the furnace with a refractory structure. Therefore, if the furnace volume is reduced, combustible and flame-retardant waste will be oxidized and decomposed. In this case, it is not possible to efficiently oxidize and decompose, and the amount of oxidation and decomposition becomes small. Further, in order to improve the melting efficiency, if only the region to which the non-combustible waste is supplied is heated, the melt may resolidify in the region away from the plasma torch and may not be discharged. Further, since the conventional plasma melting furnace and plasma melting test furnace are furnaces lined with refractory materials, melting rate of the refractory materials reduces the operating rate of the furnace. That is, since the entire furnace bottom was used as a flow path for the melt, the refractory was worn over the entire furnace and the life was short.

Therefore, the present invention is designed so that unmelted non-combustible waste is always directly heated by a heat source for high temperature heating,
The melting process can be performed efficiently and in a short time, and the efficient melting process of non-combustible waste can be performed independently.
In addition, the efficient melting process of this non-combustible waste and the oxidization / decomposition process of combustible and / or flame-retardant waste can be performed rationally collectively, and the life of the furnace can be further extended. The present invention intends to provide a melting method, melting / oxidizing / decomposing method, and melting / oxidizing / decomposing furnace of the waste.

[0007]

The method for melting waste according to the present invention for solving the above-mentioned problems is achieved by supplying non-combustible waste to one of the melting areas in a melting / oxidation / decomposition furnace, Volatile waste is melted by a heat source for high temperature heating, and the melt is discharged to the other oxidative decomposition region and held by the heat source for high temperature heating. The method for melting, oxidizing and decomposing wastes according to the present invention to solve the above-mentioned problems is a method of melting non-combustible wastes and combustible and / or flame-retardant wastes into a melting region in a melting, oxidation and decomposition furnace and oxidation.・ The non-combustible wastes supplied to the decomposition areas are melted by the heat source for high temperature heating, and the melts are oxidized to the other.
It is characterized by discharging and holding it in the decomposition area and oxidizing and decomposing the combustible and / or flame-retardant waste supplied to the oxidation / decomposition area on the melt by a heat source for high temperature heating. is there.

In this method of melting / oxidizing / decomposing waste, the heat source for high temperature heating is a plasma arc, and one or more plasma torches are provided in the melting region and the oxidizing / decomposing region, respectively. -It is preferable to make the inside of the decomposition furnace a high temperature atmosphere necessary for melting, oxidizing and decomposing waste.
In discharging the melt to the other oxidation / decomposition region, the furnace body is tilted toward the melt discharge side to discharge the melt, or the melt is discharged by overflow,
Alternatively, it is preferable that the melt is naturally flowed down and discharged depending on the level difference between the melting region and the oxidation / decomposition region, or the melt is collected in the center of the melting region and discharged from the passage to the oxidation / decomposition region.

The waste melting / oxidation / decomposition furnace of the present invention is
A melting area that melts non-combustible waste and an oxidation / decomposition area that holds the melt and that oxidizes / decomposes flammable and / or flame-retardant waste are provided in the furnace body. Each is equipped with a heat source for high temperature heating, a non-combustible waste supply device is installed above the furnace body in the melting region, and a combustible and flame-retardant waste supply device and oxidation are provided above or in the side of the furnace body in the oxidation / decomposition region.・ An air supply device for decomposition is provided, and a discharge port for the melt containing the oxidation / decomposition residue is provided at the end bottom of the oxidation / decomposition region.

In this waste melting / oxidation / decomposition furnace, it is preferable that the heat source for high temperature heating is a plasma arc and one or more plasma torches are provided in the melting region and the oxidation / decomposition region, respectively. Further, it is preferable that the plasma torch provided in the melting region can be changed in angle, can be swung, or can be changed in angle and can be swung.

However, in the waste melting / oxidation / decomposition furnace of the present invention, the floor level of the melting area in the furnace main body is raised and the floor level of the oxidation / decomposition area is lowered so that the melt is When it is discharged to the oxidation / decomposition area, and when it is formed higher than the side wall side of the furnace bottom of the melting area in the furnace body, the non-combustible waste is supplied to the central part. At the same time, when the melt is collected in the center and quickly discharged to the oxidation / decomposition region, an overflow wall is placed at the boundary between the bottom of the melting region and the bottom of the oxidation / decomposition region in the furnace body. Provided,
In some cases, the melt in the melting region overflows from the overflow wall and is discharged to the oxidation / decomposition region.

In the waste melting / oxidation / decomposition furnace of the present invention, a weir is provided between the melting area and the oxidation / decomposition area in the furnace body, and a plurality of melt discharge passages are provided in the weir. There is a case where a main body is provided and the melt is circulated and used alternately at regular intervals. Further, in the waste melting / oxidation / decomposition furnace of the present invention, the furnace body is pivotally supported on the upper end of the support frame at the lower surface of the end on the oxidation / decomposition region side, and on the lower surface of the end on the melting region side. It is preferable that the furnace is tiltable by being pivotally supported on the upper end of the lifting jack.

As described above, in the method for melting waste according to the present invention, the non-combustible waste is melted by the heat source for high temperature heating in the melting area in the furnace body, and the melt is discharged to the oxidation / decomposition area for high temperature. Since the molten state is maintained by the heat source for heating, it does not solidify, and the incombustible waste that is supplied to the melting area later is not directly covered by the melt, but is directly heated by the heat source for high-temperature heating for a short time. The melt processing can be performed efficiently. In addition, the melting / oxidation / decomposition method of the present invention can efficiently perform the melting treatment of the above-mentioned non-combustible waste, and it is also possible to oxidize / decombust combustible and / or flame-retardant waste in the area. The heat source for high temperature heating can efficiently oxidize / decompose the melt, and the oxidation / decomposition residue is melted and integrated into the high temperature melt. Moreover, the melt is heated by the heat source for high temperature heating and does not re-solidify. Therefore, the non-combustible waste and the combustible and / or flame-retardant waste can be significantly melted and reduced in volume by the batch treatment, and the radionuclide in the oxidation / decomposition residue can be fixed. In particular, a plasma arc is used as the heat source for high-temperature heating, and one or more plasma torches are provided in the melting region and the oxidizing / decomposing region, respectively, to create a high-temperature atmosphere in the furnace body for melting and oxidizing / decomposing waste. By uniformizing the temperature distribution in each region, melting treatment of non-combustible waste, oxidation / decomposition treatment of combustible and / or flame-retardant waste,
It is done more smoothly and more efficiently.

Further, in discharging the melt in the melting region to the oxidation / decomposition region, the furnace body is tilted to the melt discharge side to discharge the melt, or the melt is discharged by overflow, and the melt region is discharged. If the melt is naturally flowed down and discharged depending on the level difference between the oxidation and decomposition areas, or if the melt is collected in the center of the melting area and discharged from the passage to the oxidation and decomposition area, the melt is quickly oxidized and decomposed. Since it is discharged to the area, the melting area does not need a large space for holding the melt, and can be efficiently melted in a small space. on the other hand,
Since the furnace volume required for oxidation / decomposition in the oxidation / decomposition area can be set sufficiently large, the melting process of non-combustible waste and the oxidation / decomposition process of combustible and / or flame-retardant waste can be rationalized collectively. Done. However, according to the waste melting / oxidation / decomposition furnace of the present invention configured as described above, the above-described waste melting method and melting / oxidation / decomposition method can be carried out smoothly, reliably and efficiently. , The volume reduction rate of waste can be greatly improved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The melting method, melting / oxidizing / decomposing method and melting / oxidizing / decomposing furnace of the present invention will be described in detail with reference to the drawings.

First, a method of melting waste and melting / oxidizing
Figure 1 shows a melting, oxidation and decomposition furnace for carrying out the decomposition method.
Referring to FIGS. 2 and 3, reference numeral 40 denotes a melting / oxidizing / decomposing furnace, which has a refractory-structured furnace body 41, a non-combustible waste melting region (hereinafter referred to as a melting region) 42, a melt-holding / combustible property and a difficulty. A combustible waste oxidation / decomposition region (hereinafter referred to as an oxidation / decomposition region) 43 is provided, and a plasma torch serving as a heat source for high-temperature heating penetrating the furnace body 41 above the melting region 42 and the oxidation / decomposition region 43, respectively. 44 and 45 are provided so as to be swingable in pairs, two on the left and right, and on the front and rear, and electrodes 46 and 47 are provided on the bottom of the furnace correspondingly. A non-combustible waste supply device 48 having a sluice valve 48a is provided in the furnace body 41 above the center of the melting region 42, and the furnace body 41 is flammable and difficult to burn above the center of the oxidation / decomposition region 43. A combustible waste supply device 49 is provided, and an oxidizing / decomposing air supply device 50 is provided on the side thereof. The lower surface of the end portion of the furnace body 41 on the side of the oxidation / decomposition region 43 is pivotally supported by the upper end of the support frame 51, and the lower surface of the end portion on the opposite side is placed on the upper end of a column 53 standing upright on the base 52, and next to it. The upper end of the lifting cylinder 54 is pin-connected, and the lower end is pin-connected to the support base 55 on the base 52. An exhaust gas duct 56 is connected above the end of the furnace body 41 on the oxidation / decomposition region 43 side. The melting region 42 and the oxidation / decomposition region 43
Has a step at the floor level, that is, the bed level of the melting region 42 is raised, the bed level of the oxidation / decomposition region 43 is lowered and is inclined upward toward the outer end, and the melting region 42 becomes a shallow pool. The oxidation / decomposition region 43 is a deep pool. An overflow wall 57 is provided at the boundary between the melting region 42 and the oxidation / decomposition region 43, and a melt discharge port 58 is provided at the end of the upward sloping floor of the oxidation / decomposition region 43, and an outside opening of the discharge port 58 is provided. The end is normally sealed with a stopper (not shown). A container 59 for receiving the melt containing the oxidation / decomposition residue discharged from the melt discharge port 58 is provided below the outer open end of the sealed melt discharge port 58.
The melt filling device 60 that moves up and down and moves horizontally is faced.

Next, a method for melting waste according to the present invention using the waste melting / oxidation / decomposition furnace configured as described above will be described. The non-combustible waste 61 is laterally supplied to the melting region 42 in the furnace body 41 by the supply device 48 in a drum-canned state, and the non-combustible waste 61 is heated to a melting point or higher by the two plasma torches 44 and melted. To do. At the same time, the atmosphere in the furnace is melted by the two plasma torches 44 and the two plasma torches 45 in the oxidation / decomposition region 43.
Is heated to a temperature at which it can be maintained in the molten state. Since the incombustible waste 61 has a shallow pool in the melting region 42, as it is melted, it overflows the overflow wall 57 and oxidizes adjacently.
It is sent to the decomposition area 43. Since the two plasma torches 45 maintain the molten state in the oxidation / decomposition region 43, they do not solidify. In addition, the non-combustible waste 61 supplied to the melting region 42 later is directly heated by the two plasma torches 44 without being covered with the melt 63, and is efficiently melted in a short time. The melt 63 of the non-combustible waste 61 thus melted in the melting region 42 is successively sent to the oxidation / decomposition region 43 and stored up to a required amount, and then the furnace body 41 is moved to the lifting cylinder 5
By tilting about the upper end pivot point of the support frame 51 by driving 4, the melt is discharged from the melt discharge port 58 without the stopper, and is filled in the container 59 which has been raised by the melt filling device 60. . The container 59 filled with the melt 63 is lowered and then horizontally moved to a cooling device (not shown) to be solidified. The exhaust gas generated in the furnace body 41 is purified from the exhaust gas duct 56 through an exhaust gas purification processing device (not shown), and then exhausted into the atmosphere. Next, the melting / oxidizing / decomposing method of the present invention will be described. First, the non-combustible waste 61 is laterally supplied to the melting region 42 in the furnace body 41 by the supply device 48 in a drum-canned state, and then the combustible and flame-retardant waste 62 is supplied in a removed state. Four
9 to supply to the oxidation / decomposition region 43. Then, the non-combustible waste 61 previously supplied to the melting region 42 is heated to a melting point or higher by the two plasma torches 44 and melted. At the same time, two plasma torches 44 and oxidation / decomposition region 43
The two plasma torches 45 and the melt 63 heat the atmosphere in the furnace to a temperature above the oxidation / decomposition temperature of the combustible and flame-retardant waste 62. Since the melting region 42 is a shallow pool, the non-combustible waste 61 overflows the overflow wall 57 as it is melted and is sent to the adjacent oxidation / decomposition region 43. The combustible and flame-retardant waste 62 is supplied onto the melt 63 by the supply device 49, and the required oxidizing / decomposing air is supplied from the supply device 50, and the combustible and flame-retardant waste is supplied. The plasma torch 45 oxidizes and decomposes 62. Thus, the oxidation / decomposition residue of the flammable and flame-retardant waste 62 is contained in the melt 63, and this oxidation / decomposition residue-containing melt 63 ′ moves the furnace body 41 up and down the cylinder 5 for raising and lowering.
By tilting about the upper pivot point of the support frame 51 by driving 4, the melt is discharged from the melt discharge port 58 without the stopper, and is filled in the container 59 which has been raised by the melt filling device 60. . This melt containing the oxidation / decomposition residue 6
The container 59 filled with 3'is lowered and then horizontally moved to a cooling device (not shown) to be solidified. Furnace body 4
Exhaust gas generated in 1 is purified by an exhaust gas duct 56 through an exhaust gas purification processing device (not shown) and then discharged into the atmosphere.

As described above, in the waste melting method of the embodiment, the incombustible waste 61 is melted by the plasma torch 44 in the melting area 42 in the furnace body 41, and the melt 63 is immediately oxidized / decomposed area 43. Discharge to plasma torch 45
Because it keeps the molten state, it does not solidify,
Moreover, the non-combustible waste 6 supplied to the melting region 42 later
1 is a plasma torch 4 without being covered with the melt 63.
Directly heated by 4 and melted efficiently in a short time. In addition, in the melting / oxidation / decomposition method of the present invention, it is possible to efficiently perform the melting treatment of the above-mentioned incombustible waste 61, and in addition, the combustible and flame-retardant waste 62 is oxidized / decomposed in the area 43. Plasma torch 45 on the melt 63 of
Since it is oxidized and decomposed by the above, it can be efficiently oxidized and decomposed, and the oxidation and decomposition residue is melted and integrated into the high temperature melt 63. Moreover, the melt 6 in the oxidation / decomposition region 43
No. 3 is heated by the plasma torch 45 and does not re-solidify. Therefore, the non-combustible waste 61 and the combustible and flame-retardant waste 62 are significantly melted and reduced in volume by the batch treatment, and the radionuclide in the oxidation / decomposition residue can be fixed. Particularly, in this embodiment, since the temperature distributions of the melting region 42 and the oxidation / decomposition region 43 in the furnace body 41 are made uniform by the plasma torches 44 and 45, the melting process and the oxidation / decomposition process are stable and smooth. It is done more efficiently.

Further, the non-combustible waste 61 melted in the melting region 42 overflows the overflow wall 57 as soon as it is melted and is oxidized and oxidized.
Since it is quickly discharged to the decomposition region 43, the melting region 42
Does not require a large space to hold the melt 63,
A small space is enough. Therefore, since the furnace volume of the oxidation / decomposition region 43 can be made sufficiently large, the melting process of the non-combustible waste 61 and the oxidation / decomposition process of the combustible and flame-retardant waste 62 can be rationalized collectively. Further, according to the waste melting / oxidation / decomposition furnace of the embodiment configured as described above,
The melting method and melting / oxidation / decomposition method of the above waste are
It can be carried out smoothly, reliably and efficiently, and the volume reduction rate of waste can be greatly improved.

In the above embodiment, the plasma torch 44,
Although 45 is swingable, it is directed toward the supply position of the non-combustible waste 61 in the melting area 42, and also in the oxidation / decomposition area 43.
The angle may be variable toward the supply position of the flammable and flame-retardant waste 62, and the swingable and variable angle may be used. Further, in the above embodiment, the plasma torches 44 and 45 for generating the plasma arc are used as the heat source for high temperature heating, but the present invention is not limited to this, and an electric arc, a gas burner or the like may be used.

The melting area 42 and the oxidation / decomposition area 43 in the furnace body 41 may be changed as shown in FIG.
That is, the melting region 42 having a high floor level is provided in the center, and the oxidation / decomposition region 43 having a low floor level is provided in the periphery so that the melting region 4
The non-combustible waste 61 supplied to No. 2 may be melted by the pair of inclined plasma torches 44, and the melt 63 may be naturally flowed from the surrounding weir 42a to the oxidation / decomposition region 43 and held. .

Further, as shown in FIG. 5, the floor of the melting region 42 shown in FIG. 2 is formed to have an arcuate cross section so that the side wall side is made higher, so that the sitting of the drum can filled with the incombustible waste 61 can be improved. At the same time, the melt 63 melted by the plasma torch 44 may be easily discharged to the oxidation / decomposition region 43.

Further, as shown in FIG. 6, the plasma torch 4
4 may be inclined toward the oxidation / decomposition region 43, or the plasma torch 45 may be swung from the melting region 42 toward the oxidation / decomposition region 43 to expedite the discharge of the melt 63. Good.

Further, as shown in FIG. 7A, when the incombustible waste 61 is melted, the furnace body 41 is tilted in the opposite direction by the lifting cylinder 54, and when the melt 63 is discharged, as shown in FIG. 7B. Alternatively, the furnace body 41 may be held horizontally by the lifting cylinder 54 to expedite the discharge of the melt 63 to the oxidation / decomposition region 43. In addition, the melting region 42
Of unmelted material or incompletely melted material is prevented from flowing down to the oxidation / decomposition area 43.
The molten pool level of can be properly maintained.

As shown in FIGS. 8A and 8B, a weir 57a is provided at the boundary between the melting region 42 and the oxidation / decomposition region 43,
Two discharge passages 57b for the melt 63 are provided below the weir 57a.
Provided more than one, at least one of these can be circulated, and the other discharge passages are closed with a plug made of refractory,
The melt 63 may not flow. In this way, after a certain period of time or after confirming the constant melting loss of the refractory, the discharge passage through which the melt 63 was flowing is plugged and the other discharge passage is caused to flow, whereby the discharge portion of the melt 63 is discharged. The refractory can be made to have the same life as the refractories of other parts, or only the damaged part can be easily replaced / repaired, improving the operating rate of the furnace and extending the life of the furnace. can do.

[0026]

As can be seen from the above description, according to the waste melting method, the melting / oxidation / decomposition method of the present invention, the non-combustible waste is directly heated directly from the heat source, so that the waste can be efficiently processed in a short time. Can be melt processed. Further, according to the melting / oxidation / decomposition method of the present invention, flammable and / or flame-retardant waste is efficiently oxidized / decomposed on the melt by a heat source, and the oxidation / decomposition is performed.
The decomposition residue is melted and integrated in the high temperature melt, and the melt is heated by the heat source so that it does not resolidify. Therefore, the non-combustible waste and the combustible and / or flame-retardant waste are collectively processed, the volume of the melt is significantly reduced, and the radionuclide in the oxidation / decomposition residue can be stably fixed. Further, since the melt of the non-combustible waste can be quickly discharged, the melt region does not need a large space for holding the melt, and a small space is sufficient. Therefore, since the furnace volume for oxidation / decomposition can be sufficiently large,
Melt processing of non-combustible waste and oxidation / decomposition processing of combustible and / or flame-retardant waste are rationalized collectively.
According to the waste melting / oxidation / decomposition furnace of the present invention,
Melting, oxidation and decomposition of waste can be performed smoothly, reliably and efficiently, and the volume reduction rate of waste can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a waste melting / oxidation / decomposition furnace of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a diagram showing a modification example of a melting region and an oxidation / decomposition region inside the melting / oxidation / decomposition furnace of FIG.

FIG. 5 is a diagram showing a modified example of the floor of the melting region shown in FIG.

6 is a diagram showing another example of how to attach the plasma torch in the melting / oxidation / decomposition furnace of FIG.

FIG. 7 shows another example of the tilting operation of the furnace body, wherein a is a diagram showing a state of the furnace body at the time of melting the incombustible waste, and b is a furnace body at the time of discharging the melt. It is a figure which shows the state of.

FIG. 8 shows another example of the melt discharge portion at the boundary between the melting region and the oxidation / decomposition region of the furnace body, where a is a side view and b is a front view.

FIG. 9 is a vertical sectional view showing the basic concept of a conventional plasma melting furnace.

FIG. 10 is a vertical cross-sectional view showing the structural concept of a conventional plasma melting test furnace.

[Explanation of symbols]

 40 Melting / Oxidation / Decomposition Furnace 41 Furnace Main Body 42 Melting Area 43 Oxidation / Decomposition Area 44, 45 Plasma Torch 48 Non-combustible Waste Supply Device 49 Combustible and Flame Retardant Waste Supply Device 50 Oxidation / Decomposition Air Supply Device 54 Lifting cylinder 56 Exhaust gas duct 57 Overflow wall 58 Melt outlet 61 Non-combustible waste 62 Combustible and flame-retardant waste 63 Melt 63 'Melt containing oxidation / decomposition residue

Front page continuation (72) Yoshitaka Akagawa Yoshihiro Akakawa 1-6-1, Otemachi, Chiyoda-ku, Tokyo Nihon Nuclear Power Co., Ltd. (72) Inventor Morimoto Lighting 2-3 2-3, Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Incorporated (72) Inventor Akihiko Hayashi 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Co., Ltd. (72) Inventor Seiichiro Yamazaki 2-6-5 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Design In the office (72) Taichi Sakamoto 2-6-5 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries Ltd. Tokyo Design Office

Claims (12)

[Claims] 1. A non-combustible waste is supplied to one melting region in a melting / oxidation / decomposition furnace, the non-combustible waste is melted by a heat source for high temperature heating, and the other melt is oxidized / decomposed. A method for melting waste, characterized in that the waste is discharged to an area and held by a heat source for high temperature heating. 2. Non-combustible waste and flammable and / or flame-retardant waste are supplied to a melting area and an oxidation / decomposition area in a melting / oxidation / decomposition furnace, respectively, and are supplied to one of the melting areas. Incombustible waste is melted by a heat source for high temperature heating, and the melt is discharged to the other oxidation / decomposition area and held,
The combustible and / or flame-retardant waste supplied to the oxidation / decomposition area is oxidized on the melt by a heat source for high-temperature heating.
A method for melting, oxidizing and decomposing waste, characterized by decomposing. 3. A plasma arc is used as a heat source for high temperature heating,
One or more plasma torches are provided in the melting region and the oxidizing / decomposing region, respectively, so that the melting / oxidizing / decomposing furnace has a high temperature atmosphere necessary for melting and oxidizing / decomposing the waste. The method for melting, oxidizing and decomposing waste according to 1 or 2. 4. When discharging the melt to the other oxidation / decomposition region, the furnace body is tilted to the melt discharge side to discharge the melt, or the melt is discharged by overflow, or The melt is naturally flowed down and discharged depending on the level difference between the melting region and the oxidation / decomposition region, or the melt is collected in the center of the melting region and discharged from the passage to the oxidation / decomposition region. The method for melting waste according to claim 2 or the method for melting / oxidizing / decomposing waste according to claim 2 or 3. 5. A melting region for melting non-combustible waste and an oxidation / decomposition region for holding the melt and oxidizing / decomposing combustible and / or flame-retardant waste are provided in the furnace body to form a melting region. Heat sources for high-temperature heating are provided in the oxidation / decomposition area, non-combustible waste supply device is provided above the furnace body in the melting area, and flammable and flame-retardant waste is provided at the top or side of the furnace body in the oxidation / decomposition area. An object supply device and an air supply device for oxidation / decomposition are installed,
A furnace for melting / oxidizing / decomposing waste, which is provided with an outlet for the melt containing oxidation / decomposing residue at the end of the furnace on the side of the oxidizing / decomposing area. 6. A plasma arc is used as a heat source for high temperature heating,
The melting / oxidizing / decomposing furnace for waste according to claim 5, wherein one or a plurality of plasma torches are provided in the melting region and the oxidizing / decomposing region, respectively. 7. The discard according to claim 5, wherein the plasma torch provided in the melting region is variable in angle, is swingable, or is variable in angle and swingable. Material melting, oxidation and decomposition furnace. 8. The molten material is discharged to the oxidation / decomposition area by increasing the bed level in the melting area and lowering the bed level in the oxidation / decomposition area in the furnace body. Item 5. The melting / oxidation / decomposition furnace for waste according to any one of Items 5, 6 and 7. 9. The melting region in the furnace body is formed higher than the side wall side of the furnace bottom as compared to the center so that the non-combustible waste is supplied to the central portion and the molten material is collected in the central portion. The melting / oxidation / decomposition furnace for waste according to any one of claims 5, 6, 7, and 8, characterized in that the waste is rapidly discharged to the oxidation / decomposition region. 10. An overflow wall is provided at the boundary between the furnace bottom of the melting region and the furnace bottom of the oxidation / decomposition region in the furnace body, and the melt in the melting region overflows from the overflow wall to cause the oxidation / decomposition region. The discharge is made to
The waste melting / oxidation / decomposition furnace according to any one of 7 and 8. 11. A weir is provided between a melting region and an oxidation / decomposition region in a furnace body, and a plurality of melt discharge passages are provided in this weir, and the melt is alternately flowed at regular intervals for use. The melting / oxidation / decomposition furnace for waste according to claim 5, 6, or 7. 12. The furnace body is tilted by pivotally supporting an upper surface of a supporting frame on a lower surface of an end portion on the side of an oxidation / decomposition region and on an upper surface of an elevating jack on a lower surface of an end portion on a melting region side. Claims 5, 6, 7, 8, 9, 1 characterized by enabling
The waste melting / oxidation / decomposition furnace according to any of 0 and 11.