KR19990080422A - Pyrolysis and Plasma Vitrification of Low Level Radioactive and Hazardous Wastes - Google Patents

Abstract

The present invention relates to a pyrolysis and plasma vitrification system for low-level radioactive and hazardous wastes, wherein the pyrolysis and plasma vitrification system for low-level radioactive and hazardous wastes is a pyrolysis and plasma vitrification system. Is the first molten pool; A second molten pool for temporarily storing the molten metal flowing from the first molten pool and periodically separating and discharging a predetermined level of metal component from the molten metal; A metal tap spout having a predetermined diameter on the bottom of the second molten pool and formed vertically; A slag discharge port formed at a lower side of a side portion adjacent to the second molten pool; An exhaust gas outlet formed in communication with the exhaust gas treatment unit at a predetermined position on an upper surface thereof; A waste supply port formed in communication with the waste supply portion at a predetermined position on an upper surface thereof; A torch operating hole formed at a predetermined position on one side of the melting furnace; A torch for melting the solidified melt by heating the first molten pool, the second molten pool, and the slag discharge port; Torch position control means for controlling an arrangement state of the torch; And a supply waste administration means installed between the waste supply port and the waste supply unit.

Description

Pyrolysis and Plasma Vitrification Systems for Low-Level Radioactive and Hazardous Wastes

The present invention relates to a pyrolysis and plasma vitrification system of low-level radioactive and hazardous waste, and more particularly, to prevent the backflow of waste gas from the melting furnace, improve the melting efficiency by compressing the waste while simultaneously administering the appropriate amount of waste. The present invention relates to a pyrolysis and plasma vitrification system of low-level radioactive and hazardous wastes, which facilitates flow control and separation and discharge of molten metals and reworked even when the molten metals solidify.

In general, waste is generated daily in homes, offices and industrial plants, and conventionally, such waste is buried in landfills in urban suburbs or in oceans where natural spaces are not damaged or damaged.

However, landfill disposal of wastes must be continuously secured, and after the landfill, not only the environment is seriously polluted by the generation of leachate and gas, but also a lot of costs are required to secure landfills and expand landfill facilities.

Waste incineration treatment technology has been developed as an alternative to solve the problems caused by the conventional landfill.

Conventional waste incineration technology supplies waste to an incinerator and completely burns it, and high heat generated during incineration of waste is used for heating or hot water generation of houses or facilities around the incinerator.

However, the existing waste treatment as described above continues to incinerate residues and fly ashes after incineration of low level radioactive wastes and designated wastes (such as hazardous wastes and incineration fly ashes containing a large amount of inorganic and heavy metals) by incinerators. Not only the substance contained, but also leachate after the landfill is leaked, and to prevent this, even if the solidification treatment to further increase the volume of the waste ultimately there was a problem that the waste of the land is not only severe but also can not recycle the waste.

Accordingly, the present applicant has developed a pyrolysis and plasma vitrification system of low-level radioactive and hazardous wastes that can overcome the problems of the waste treatment method as described in Korean Patent Application No. 98-8762, issued on March 16, 1998. Filed.

Hereinafter, it should be noted that the present specification is described in the prior art of the patent application No. 98-8762 filed domestically by the applicant.

1 is a schematic diagram of a typical pyrolysis and plasma vitrification system, and FIG. 2 is a cross-sectional view showing the structure of a conventional plasma melting furnace.

1 and 2, a conventional low-level radioactive and hazardous waste pyrolysis and plasma vitrification system includes a plasma melting furnace (a), a waste supply unit (b), a melting furnace cooling unit (c), and an exhaust gas treatment unit (d). ), A metal processing portion (e), a granular slag forming portion (f), a granular slag tank (g), and a slag collecting device (h).

The plasma melting furnace (a) has a side wall portion (a1) and a lower surface portion (a2) having a wall structure, an upper portion (a3) having a panel structure, and a waste melting chamber (a4) therein, a torch (a5) and a cathode plate (a6). ), A slag discharge port a7, a molten metal discharge port a8, a waste supply port a9, an exhaust gas discharge port a10, and a driving device a14. A cooling passage is provided. The torch a5 has a double wall structure having a hollow inside and is operatively installed on the inner upper surface of the waste melting chamber a4 laterally and vertically by a driving device a14 to generate plasma arc heat. It is connected to the power supply (a11) and the compressed air supply (a12), the hollow of the double wall is connected in communication with the torch cooling device (a13).

The torch cooling device a13 is connected to the hollow of the torch a5 and is connected to the cooling water tank a14 for supplying the cooling water in the hollow, and the heat exchanger a15 for cooling the high temperature cooling water discharged from the hollow. The negative electrode plate a6 may be installed at the bottom of the waste melting chamber a4 to discharge the torch a5, or may be installed at the lower end of the torch itself. The slag discharge port a7 is formed to be inclined at one side wall portion a1 to communicate with the waste melting chamber a4, and the molten metal discharge port a8 is configured to extract the molten metal waste. It is formed perpendicular to the bottom of the. The waste supply port (a9) is formed in communication with the waste melting chamber (a4) at a predetermined position on one side of the upper portion (a3) and connected to the waste supply unit (b) to receive the waste to be treated, and the exhaust gas outlet (a10). ) Is vertically formed in communication with the waste melting chamber a4 at a predetermined position in the upper portion a3 so as to be in communication with the exhaust gas treatment unit d to completely burn the exhaust gas generated when the waste is melted.

The waste supply part (b) is provided with a plurality of conveyors (b1) and the collecting port (b2), the melting furnace cooling unit (c) is connected in communication with the cooling passage of the plasma melting furnace (a) to supply the cooling water And a cooling water tank (c1), a heat exchanger (c2) for cooling the high temperature cooling water discharged from the cooling flow path, and a circulation pump (c3) for circulating the cooling water.

The exhaust gas treatment unit (d) includes a dust collector (d1) for collecting dust, a rusty removal device (d2), and a fan (d3), and the metal treatment unit (e) is lowered through the molten metal discharge port (a8). The molten metal discharged to the metal is formed into a nod of a predetermined shape and stored. The granular slag forming portion f includes a shower chamber f1, a cooling water tank f2, and a pump f3.

One end of the shower chamber f1 is connected to the slag discharge port a7 of the plasma melting furnace a7 so as to be inclined and fixedly installed. The coolant tank f2 is configured to rapidly cool the slag discharged with coolant. It is connected in communication with the shower chamber (f1), the granular slag tank (g) of the shower chamber (f1) to temporarily remove the granular slag formed by rapid cooling in the shower chamber (f1) to remove water It is arranged in the lower side, the slag collecting device (h) is configured to be connected by the transfer means such as the granular slag tank (g) and the conveyor.

In the plasma melting furnace of the conventional low-level radioactive and hazardous waste pyrolysis and plasma vitrification system having the above configuration, the waste supply unit connected to the waste supply port and supplying waste does not have a means for supplying an appropriate amount of waste. In addition, since there is no blocking structure with the inside of the melting furnace, incomplete incineration occurs when excess supply of waste occurs, and backflow of exhaust gas occurs in the direction of the supply port, which seriously pollutes the atmosphere by fly ash and dust. If the melt of molten waste melts in the furnace by the torch, and the operation is suspended, the molten metal discharge outlet is solidified and shut off, so the solidified molten metal must be removed manually for rework. Very bad work That there is a problem.

In order to solve this problem, the present invention prevents backflow of waste gas from the melting furnace, improves the melting efficiency by administering an appropriate amount of waste, and facilitates flow control and separation discharge of the molten metal and reworking the molten metal. It is an object of the present invention to provide a pyrolysis and plasma vitrification system of low-level radioactive and hazardous wastes having a structure capable of carrying out the present invention.

1 is a schematic diagram of a typical pyrolysis and plasma vitrification system.

2 is a cross-sectional view showing the structure of a conventional plasma melting furnace.

3 is a cross-sectional view showing the structure of a plasma melting furnace according to the present invention;

4 is a front view showing the structure of a dam formed in the first molten pool of the plasma melting furnace according to the present invention;

♣ Explanation of symbols for main part of drawing ♣

20: plasma melting furnace 21: first molten pool

22: 2nd molten pool 23: metal tap

24: slag discharge port 25: exhaust gas discharge port

26: waste supply port 27: torch operator

28: torch 29: torch position control means

29a: vertical guide 29b: horizontal guide

29c: first driving means 29d: second driving means

30: supply waste administration means 30a: main body

30b: administration port 30c: first closed door

30d: second sealed door 30e: compression means

31: dam 32: overflow groove

33: seal

The object of the present invention described above is to completely burn a plasma melting furnace for melting waste, a waste supply unit for supplying designated waste into the melting furnace, a melting furnace cooling unit for cooling the plasma melting furnace, and gas discharged from the melting furnace. An exhaust gas treatment unit for forming the granules, a metal treatment unit for treating the metal waste melted and discharged in the melting furnace into a nodule, a granular slag forming unit for forming the slag discharged from the melting furnace into granules, and a granularity for temporarily storing the granular slag In the pyrolysis and plasma vitrification system of a low level radioactive and hazardous waste comprising a slag tank and a slag collecting device for collecting and storing the granular slag from the granular slag tank, the plasma melting furnace is formed with a single layer of the bottom surface in a multi-layered manner. At the end, a dam of a certain height The first molten pool is filled with the molten metal; A second molten pool formed in a bottom layer of the bottom part to temporarily store the molten metal flowing from the first molten pool and to periodically separate and discharge a predetermined level of metal component from the molten metal; A metal tap spout having a predetermined diameter at a bottom of the second melt pool and vertically connected to be in communication with the metal treatment unit for separating and discharging the metal component in the melt of the waste stored in the second melt pool; A slag discharge port formed at a lower side of the side portion adjacent to the second molten pool and connected in communication with the granular slag forming unit to discharge slag molten metal from the second molten pool; An exhaust gas outlet formed in communication with the exhaust gas treatment unit at a predetermined upper surface to discharge gas generated in the melting furnace to the exhaust gas treatment unit; A waste supply port formed in communication with the waste supply portion at a predetermined upper surface to supply waste to the first molten pool in the melting furnace; A torch operating hole formed at a predetermined position on one side of the melting furnace; A torch sealed by the seal in the torch operation hole and installed at a diagonal to enable vertical rotation and linear operation, and to melt the solidified melt by heating the first molten pool, the second molten pool, and the slag discharge port as necessary; Torch position control means installed to be connected to one end of the torch to control an arrangement state of the torch; By the pyrolysis and plasma vitrification system of the low-level radioactive and hazardous waste, characterized in that it is installed between the waste supply port and the waste supply unit to prevent waste gas backflow in the melting furnace and to introduce an appropriate amount of waste into the melting furnace. Is achieved.

Hereinafter, a pyrolysis and plasma vitrification system of a low level radioactive and hazardous waste according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. do.)

3 is a cross-sectional view showing the structure of the plasma melting furnace according to the present invention, Figure 4 is a front view showing the structure of a dam formed in the first molten pool of the plasma melting furnace according to the present invention.

1, 3 and 4, the low-level radioactive and hazardous waste pyrolysis and plasma vitrification system according to the present invention is a plasma melting furnace 20, waste supply unit (b), melting furnace cooling unit (c), An exhaust gas treatment unit d, a metal treatment unit e, a granular slag forming unit f, a granular slag tank g, and a slag collecting device h are included.

The plasma melting furnace 20 is a housing having a side wall portion and a lower surface portion having a wall, and an upper surface portion having a panel structure and a melting chamber formed therein. The first molten pool 21, the second molten pool 22, and the metal tap (23), slag discharge port (24), exhaust gas discharge port (25), waste supply port (26), torch operating hole (27), torch (28), torch position control means (29), And supply waste administration means (30).

The bottom portion of the plasma melting furnace 20 is inclined in multiple layers, and the surface between the top layer and the bottom layer forms an inclined surface.

The first molten pool 21 is formed so that the upper layer is filled with the molten metal by a dam 31 formed at a predetermined height at the end of the upper layer of the bottom surface of the plasma melting furnace 20. It is formed to be inclined at a predetermined angle in the direction 31, and the predetermined position on the upper surface of the dam 31 helps to overflow the molten metal filled in the first molten pool 21, so that the position of the torch 28 can be easily changed. The overflow groove 32 for cutting is formed to be bent downward with a predetermined width.

The second molten pool 22 is recessed in the bottom layer of the bottom surface of the plasma melting furnace 20 to temporarily store the molten metal flowing from the first molten pool and periodically separate and discharge a predetermined level of metal component from the molten metal. Is formed.

The metal tapping outlet 23 is vertically formed with a predetermined diameter on the bottom of the second molten pool 22 so as to separate and discharge the metal component in the molten metal of the waste stored in the second molten pool 22. It is connected in communication with the metal treatment (e).

The slag discharge port 24 is formed at the lower end side of the side portion adjacent to the second molten pool 22 so as to discharge the slag molten metal from the second molten pool 22 so as to be in communication with the granular slag forming unit f. do.

The exhaust gas discharge port 25 is formed in communication with the exhaust gas processing unit d at a predetermined position on the upper surface of the plasma melting furnace 20 to discharge the gas generated in the melting furnace 20 to the exhaust gas processing unit d.

The waste supply port 26 is formed at a predetermined position on the upper surface of the melting furnace 20, that is, the upper side of the first melting pool 21 in order to supply waste to the first melting pool 21 in the plasma melting furnace 20. It is connected in communication with the waste supply (b).

The torch operating hole 27 is formed at a predetermined position on the upper side of one side of the plasma melting furnace 20 so that the torch 28 is operatively installed.

The torch 28 has a double wall structure having a hollow inside and is connected to a power supply device a11 and a compressed air supply device a12 to generate plasma arc heat, and the hollow of the double wall is a torch cooling device a13. Is connected in communication with the torch position control means (29), and the other end is connected to the torch position control means (29), and the other end of the first melt pool (21) or the second melt pool The 22 and the slag discharge port 24 is selectively positioned to melt the molten metal, and one end of the torch operating hole 27 and the torch 28 is operated by the seal 33 so that the exhaust gas does not leak to the outside. Sealed freely, the seal 33 uses a flexible seal.

The torch position control means 29 is a plasma melting furnace 20 so that the torch 28 melts the solidified melt by heating the first molten pool 21 or the second molten pool 22 and the slag discharge port 24. It is installed on one side of the outer side to control the torch 28 to rotate up and down and linear operation, the vertical guide 29a, the horizontal guide 29b, the first driving means (29c) and the second driving means (29d) It is composed of

The horizontal guide 29b is fixed to the ground horizontally outside the one side of the plasma melting furnace 20, the vertical guide 29a is operated along the horizontal guide 29b on the upper surface of the horizontal side 29b Possibly vertically installed.

The first driving means 29c is fixed to the upper end side of the vertical guide 29a to drive the torch 28 so that one end of the torch 28 is operated up and down along the vertical guide 29a. The second driving means 29d is fixedly installed at a lower end side of the vertical guide 29a or a predetermined position of the horizontal guide 29b so that the vertical guide 29a is moved back and forth along the horizontal guide 29b. ).

The first and second driving means 29c and 29d may use a motor, or may use a syncer. The guide structure of the vertical and horizontal guides 29a and 29b may be various. The torch 28 may be vertically operated along the vertical guide 29a, and the vertical guide 29a may be any structure as long as it can be moved back and forth along the horizontal guide 29b.

The feed waste administration means 30 is disposed between the waste supply port 26 and the waste supply portion (b) of the plasma melting furnace 20 to compress the waste supplied from the hopper of the waste supply portion (b) by an appropriate amount to plasma The main body 30a, the first and second sealed doors 30c and 30d, and the compression means 30e are for administering into the melting furnace 20 and preventing the exhaust gas from flowing back into the melting furnace 20. ).

The main body 30a has an inlet 30b integrally connected to the hopper of the waste supply part b as an enclosure and connected to the waste supply port 26 at a right angle on the lower side.

The first hermetically closed door 30c is installed to be operated horizontally at the upper end of the main body 30a so as to open and close the hopper of the waste supply part b and the inner space of the main body 30a, and the second hermetically closed door ( 30d) is installed to be operated horizontally at a predetermined interval downward from the first sealed door 30c so as to open and close the inner middle portion and the lower space of the main body 30a.

The compression means (30e) is to compress the waste supplied from the hopper of the waste supply unit 40 to the first molten pool 21 of the melting furnace 20 through the administration port 30b to the main body (30a) It is preferably installed horizontally in the lower portion of the, it is preferable to use a compression piston as the compression means (30e).

Preferably, the first and second sealed doors 30c and 30d and the compression piston 30e are operated by a hydraulic or pneumatic cylinder.

In the plasma melting furnace 20 of the pyrolysis and plasma vitrification system of the low-level radioactive and hazardous waste according to the present invention having the configuration as described above, when the first sealed door 30c of the feed waste dispensing means 30 is opened, the waste supply unit The waste stored in the hopper 40 is introduced into the main body 30a by its own weight and is filled in the space between the first sealed door 30c and the second sealed door 30d.

When the waste is filled in the upper space inside the main body 30a as described above, the first airtight door 30c is operated to close the upper surface of the main body 30a so that no more waste can be introduced into the main body 30. After that, the second sealed door 30d is opened.

When the second closed door 30d is opened as described above, the waste filled in the space between the first and second closed doors 30c and 30d falls into the inner lower space of the main body 30a.

When the waste is filled in the inner lower portion of the main body 30a as described above, the compression means 30e is operated to compress the waste to the administration port 30b, and the compressed waste is administered to the administration port 30b and the plasma melting furnace 20. Through the waste supply port 26).

When the waste compressed as described above is administered to the first molten pool 21, the second sealed door 30d is operated to block the space between the inner middle part and the lower part of the main body 30a, and then the torch 28 Operation to melt the waste administered to the first molten pool (21).

The melt of the waste melted in the first molten pool 21 by the torch 28 is filled in the first molten pool 21 and overflows through the overflow groove 32 of the dam 31 along the second slope. It flows into the melting pool 22 and is temporarily stored.

As described above, when the molten metal is temporarily stored in the second molten pool 22, the molten metal solidifies as the temperature of the molten metal decreases and the slag discharge port 24 is blocked when the operation is temporarily stopped. At this time, the torch position control means 29 is operated to move the end of the torch 28 to the second molten pool 22 and the slag discharge port 24 to melt the molten solidified.

That is, the first driving means 29c of the torch position control means 29 is driven to move one end of the torch 28 downwardly by a predetermined distance along the vertical guide 29a. When one end of the torch 28 is moved downward, the other end of the torch 28 is rotated upward by a predetermined angle about the torch operating hole 27 and lifted upward. When the end of the torch 28 is lifted upward by the required position, the second driving means 29d is driven and vertical while the first driving means 29c is stopped to maintain the state of the torch 28. The guide 29a moves to the right side (see FIG. 3) along the horizontal guide 29b.

When the vertical guide 29a is moved to the right along the horizontal guide 29b as described above, the torch 28 is moved to the right by the distance the vertical guide 29a is moved, so that the second molten pool 22 and It moves to the slag discharge port 24 side, the second driving means 29d is stopped and the first driving means 29c is driven in reverse to rotate the end of the torch 28 downward by a predetermined angle and then fix the second molten metal. The molten metal of the pool 22 and the slag discharge port 24 side is continuously melted so as not to solidify.

The molten slag is separated into the slag and the metal material as described above, the slag is discharged into the granular slag forming part f through the slag discharge port 24 and formed into the granular slag, and the metal material is the metal processing part through the metal tapping port 23. It is tapped into (e) and formed into a nod.

When the melt treatment of the waste is completed as described above, the torch 28 is operated by operating the first and second driving means 29c and 29d of the torch position control means 29 in the reverse order and rotation. After moving to the first molten pool 21, the feed waste administration means 30 is operated as described above to administer the waste to the first molten pool 21 to continue the operation.

In addition, the exhaust gas generated in the plasma melting furnace 20 during the melting process is discharged to the exhaust gas processing unit d through the exhaust gas discharge port 25 and treated, and then discharged into the atmosphere.

According to the present invention described above, since the amount of waste administered into the melting furnace 20 by the feed waste administration means 30 is always constantly administered in an appropriate amount, the melting efficiency is significantly increased by the torch 28. Instead, the first and second melt pools 21 and 22 are formed in the melting furnace 20 to perform initial melting of the waste in the first melt pool 21 so that the melt of the waste is stored in the first melt pool 21. The molten metal flows over the dam 31 to flow into the second molten pool 22 to control the flow of the molten metal and to facilitate the separate discharge of the slag and the metallic material, and by the torch position control means 29. The torch 28 is quickly moved to the first molten pool 21, the second molten pool 22, and the slag discharge port 24 by simple operation to melt the molten metal, and the molten metal is separated and discharged to each outlet. To stop solidification and to stop working Even though the molten metal solidifies on the slag discharge port 24 side, the torch 28 is easily moved to solidify and melt the molten metal blocking the discharge port 24 to remove and remove the molten metal. Have

Claims (8)

A plasma melting furnace for melting waste, a waste supply unit for supplying designated waste into the melting furnace, a melting furnace cooling unit for cooling the plasma melting furnace, an exhaust gas treatment unit for completely burning the gas discharged from the melting furnace, A metal treatment unit for treating metal waste melted and discharged in the melting furnace into a nodule, a granular slag forming unit for forming slag discharged from the melting furnace into granules, a granular slag tank for temporarily storing the granular slag, and a granular slag tank In the pyrolysis and plasma vitrification system of low-level radioactive and hazardous waste, comprising a slag collecting device for collecting and storing granular slag from the plasma melting furnace, the plasma melting furnace 20 has a bottom portion formed in multiple layers and a predetermined height at the end of the top layer. Dam 31 is formed and the melt is filled And a first molten pool (21); A second molten pool 22 which is formed in a lower layer of the bottom surface to temporarily store the molten metal flowing down from the first molten pool 21 and periodically separate and discharge a predetermined level of metal component from the molten metal; Metal material formed vertically on the bottom surface of the second molten pool 22 and connected in communication with the metal processing unit to separate and discharge metal components in the molten metal of the waste stored in the second molten pool 22. A tapping hole 23; A slag discharge port (24) formed at a lower side of the side portion adjacent to the second molten pool (22) and connected in communication with a granular slag forming unit to discharge slag molten metal from the second molten pool (22); An exhaust gas outlet 25 formed in communication with the exhaust gas treatment part at an upper surface to discharge gas generated in the melting furnace 20 to the exhaust gas treatment part; A waste supply port 26 formed in communication with the waste supply portion at a predetermined upper surface to supply waste to the first molten pool 21 in the melting furnace 20; A torch operating hole 27 formed at a predetermined position on one side of the melting furnace 20; The torch operating hole 27 is sealed with a seal 33 and is installed at a diagonal so as to enable vertical rotation and sinusoidal operation. The first molten pool 21 and the second molten pool 22 and the slag discharge port 24 as necessary. A torch 28 to melt the solidified melt by heating the; A torch position control means 29 installed to be connected to one end of the torch 28 to control an arrangement state of the torch 28; It is installed between the waste supply port 26 and the waste supply unit to prevent waste gas backflow in the melting furnace 20, characterized in that it comprises a feed waste administration means 30 for introducing an appropriate amount of waste into the melting furnace 20 Pyrolysis and plasma vitrification systems for low-level radioactive and hazardous waste. The inlet 30b of claim 1, wherein the supply waste administering means 30 is an enclosure, the upper surface of which is connected to the waste supply part 40 and connected to the waste supply port 26 at right angles on the lower side. A first sealed door 30c having a main body 30a having a main body 30a and operatively installed horizontally at an upper end of the main body 30a to open and close the hopper of the waste supply unit 40 and the inner space of the main body 30a; And a second sealed door 30d installed to be horizontally spaced downwardly from the first sealed door 30c to open and close the inner middle portion and the lower space of the main body 30a, and the main body 30a. Compression means (30e) for compressing the waste to be supplied horizontally installed in the inner lower portion of the supplied to the first molten pool 21 of the melting furnace 20 through the administration port (30b), Between the waste supply port 26 and the waste supply portion 40 of the plasma melting furnace 20 A pyrolysis and plasma vitrification system for low level radioactive and hazardous waste, characterized in that it is disposed in the. The torch position control means (29) according to claim 1, wherein the torch position control means (29) is horizontally fixed to the ground outside one side of the plasma melting furnace (20) and horizontal to the upper surface of the horizontal side (29b). Vertical guides 29a installed vertically operatively along the guides 29b and fixed to the upper end side of the vertical guides 29a so that one end of the torch 28 is vertically up and down along the vertical guides 29a. The first driving means 29c for driving the torch 28 so as to be operated in a predetermined manner; and the vertical guide 29a is fixedly installed at a lower end of the vertical guide 29a or at a predetermined position of the horizontal guide 29b. And pyrolysis and plasma vitrification system of low-level radioactive and hazardous waste, characterized in that it comprises a second driving means (29d) for driving the vertical guide (29a) to be moved back and forth along). The dam 31 has a predetermined width at a predetermined position on the upper surface of the dam 31 so as to be bent downward, and includes an overflow groove 32 for assisting the overflow of the molten metal and the movement of the torch 28. Pyrolysis and plasma vitrification systems for low-level radioactive and hazardous waste. The pyrolysis and plasma vitrification system of low level radioactive and hazardous waste according to claim 1, characterized in that the seal (33) is a flexible seal. 2. The pyrolysis and plasma vitrification system of low-level radioactive and hazardous waste according to claim 1, wherein the bottom surface of the first molten pool is inclined at a predetermined angle toward the dam (31). According to claim 1 or 3, The torch 28 is rotated when the first driving means (29c) is driven and the other end is moved up and down when one end is moved up and down along the vertical guide (29a) The pyrolysis and plasma vitrification system of low-level radioactive and hazardous waste, characterized in that the other end is left and right operated when the second driving means 29d is driven to move the vertical guide 29a along the horizontal guide 29b. . 3. The pyrolysis and plasma vitrification system of low level radioactive and hazardous waste according to claim 2, wherein the compression means (30e) is a compressed piston.