KR101569758B1 - Combined melting device having metallic sector - Google Patents

Combined melting device having metallic sector Download PDF

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Publication number
KR101569758B1
KR101569758B1 KR1020150127377A KR20150127377A KR101569758B1 KR 101569758 B1 KR101569758 B1 KR 101569758B1 KR 1020150127377 A KR1020150127377 A KR 1020150127377A KR 20150127377 A KR20150127377 A KR 20150127377A KR 101569758 B1 KR101569758 B1 KR 101569758B1
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South Korea
Prior art keywords
melting furnace
cooling
cooling water
melting
furnace unit
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KR1020150127377A
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Korean (ko)
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최석모
박규원
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뉴클리어솔루션(주)
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/30—Processing
    • G21F9/308—Processing by melting the waste
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any preceding group

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Mechanical Engineering (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

The present invention relates to a composite melting furnace, and a plasma melting furnace and a low-temperature melting furnace can be combined to treat any kind of hazardous waste. The low temperature melting furnace is used to vitrify combustible waste, and the plasma melting furnace is classified as a facility for treating flammable and nonflammable. The slag discharged from the low-temperature melting furnace can be selectively discharged to the outside of the plasma melting furnace and the apparatus, and the melt produced in the plasma melting furnace can selectively discharge the slag and the metal through at least two outlets. The low temperature melting furnace includes a vitrified low temperature melting furnace metal sector having three or more cooling passages having different diameters, thereby enhancing the cooling efficiency of a melting furnace that is enlarged.

Figure R1020150127377

Description

TECHNICAL FIELD [0001] The present invention relates to a composite melting furnace having a metal sector,

The present invention relates to a composite melting furnace system for melting and discharging harmful waste including radioactive waste, wherein the low-temperature melting furnace part is used as a facility for treating liquid waste containing sludge and for handling combustible waste, It is used as a facility capable of treating most wastes including ductility. In addition, the low temperature melting furnace part has a metal sector, and the cooling channel structure inside the metal sector is improved to efficiently cool the low temperature melting furnace which is becoming larger. To a sintering furnace apparatus.

More stable handling, storage and management of hazardous wastes, especially radioactive waste from nuclear power generation, is a very important issue. Various techniques such as compression, incineration, and cement solidification have been applied as methods for treating such hazardous wastes. However, each technique has a problem of low cost and high possibility of secondary damage such as leachate.

Among the methods of treating and storing hazardous waste in some countries, the induction heating type low temperature melting furnace is used to burn harmful waste, and the heavy metals are melted and made into a glass solid with glass to prevent it from leaching into the surrounding environment Low temperature melting furnace vitrification technology has been developed.

As another method, a waste melting method using a plasma torch has been used, and a plasma melting furnace has been used as a kind and size of a melting furnace suitable for use by constructing a separate facility for each company. The plasma melting furnace melts the waste by the plasma torch which generates heat at a high temperature and discharges the metal or slag through the exclusive outlet.

The metal sector used for cooling the melting furnace in the conventional low-temperature melting furnace vitrification apparatus is divided into two types according to the number of the cooling channels, one using the cooling channel and the other using two cooling sectors. In the case of using one channel, the inlet and the outlet are formed at different positions. In the case of using two cooling channels in the metal sector, the inlet and the outlet are divided at the same position. In such conventional systems, there was no problem in cooling when the low-temperature melting furnace was small, but there was a problem that the cooling inside the melting furnace became uneven due to the increase in the size of the low-temperature melting furnace and the problem that the temperature at the corners inside the metal sector increased, The cooling efficiency is also lowered.

Korea Open Patent No. 2012-0129418 (disclosed on November 28, 2012) Korean Unexamined Patent Publication No. 2005-0004647 (Dec. 12, 2005) Korean Laid-Open Patent No. 2014-0064048 (Published May 28, 2014) Korean Published Patent Application No. 2013-0093285 (published on Aug.22, 2013)

The vitrification apparatus using the conventional low-temperature melting furnace has a problem that it is difficult to treat non-combustible wastes such as metallic ones, and the plasma furnace has a problem that it is difficult to stably vitrify the liquid wastes among the low-level radioactive wastes. It is possible to melt treatment regardless of the type of waste and to operate efficiently according to the quantity of waste. In the vitrified low-temperature melting furnace metal sector, the structure of the cooling channel is improved to increase the number of cooling channels, And to provide a composite melting furnace device including a low-temperature melting furnace metal sector in which the cooling efficiency of the corner portion of the metal sector is increased by differently arranging the outlet side.

It is an object of the present invention to provide a composite melting furnace for treating hazardous wastes, comprising: a first melting furnace unit including a metal sector forming a melt by an induction coil and a plurality of assembled members for cooling a low- A second melting furnace unit for forming a melt by the plasma torch and an inner outlet formed in the molten space of the first furnace unit so as to allow the melt to move into the melting space of the second furnace unit, A first cooling passage connected to the cooling water inlet pipe and the cooling water discharge pipe at the upper portion and formed as a single flow path from the cooling water inlet to the cooling water header at the lower portion of the metal sector, And at least two independent sub-flow paths from the cooling water header to the cooling water discharge pipe The first is achieved by the combined melting furnace comprises a second cooling channel.

The first melting furnace unit includes an inclined bottom portion at an upper portion of the inclined bottom portion and a first outlet port through which at least a portion of the melted material can be discharged to the outside of the composite melting furnace.

The internal discharge port may be formed at a lower portion of the inclined bottom portion of the first melting furnace unit.

The first melting furnace unit may include an outlet shut-off rod for opening and closing the first outlet.

The second melting furnace unit may include a second outlet formed to communicate with at least a part of the side surface of the melt space and a third outlet formed to communicate with the bottom of the melt space.

The inner discharge port of the first melting furnace unit may be formed to communicate with the ceiling portion of the second melting furnace unit melting space.

The second melting furnace unit may include a drum loading port for inputting the drum into the melting space.

The cooling water header may be formed such that cooling water moving downward through the first cooling channel may be U-shaped upwardly moved through the second cooling channel.

The second cooling flow path may be formed such that a plurality of sub flow paths are parallel to the melting furnace body and are closer to the melting space of the melting furnace body than the first cooling flow path.

Sectional area of each of the second cooling passages may be substantially the same, and a cross-sectional area of the first cooling passages may be larger than a cross-sectional area of the second cooling passages.

The composite melting furnace apparatus of the present invention is an apparatus that combines a plasma melting furnace and a low-temperature melting furnace, and can treat and discharge non-combustible wastes that can not be treated in a low-temperature melting furnace to a plasma melting furnace. The low temperature melting furnace is used to vitrify combustible waste, and the plasma melting furnace is classified as a facility that simultaneously treats flammability and nonflammability. When the slag discharged from the low temperature melting furnace and the slag discharged from the plasma melting furnace have the same characteristics, they can be discharged through the plasma melting furnace outlet.

The low temperature melting furnace is a facility that treats all waste except non-combustible and can operate alone. Since the plasma melting furnace can operate all waste except liquid waste, it can be operated either by selecting two facilities or by operating two types simultaneously Method can be operated efficiently.

Moreover, the cooling temperature in the entire metal sector of the low-temperature melting furnace can be uniformly maintained, and an excellent cooling effect can be obtained even in a large-scale low-temperature melting furnace.

In addition, by sharing the exhaust gas treatment facility, it is possible to improve human and material cost saving and operation efficiency, and it is possible to efficiently and safely treat the radiation waste regardless of the kind.

1 is a plan view of a composite melting furnace apparatus according to an embodiment of the present invention.
2 is a vertical cross-sectional view of a composite melting furnace according to an embodiment of the present invention viewed from the front.
FIG. 3 is a vertical cross-sectional view of a composite melting furnace according to an embodiment of the present invention, viewed from one side.
4 is a cross-sectional view of a low temperature furnace metal sector assembly in accordance with an embodiment of the present invention.
5 is a cross-sectional view of a low temperature melting furnace metal sector according to an embodiment of the present invention.
6 is a sectional view of AA ', BB' and CC 'in FIG.

The composite melting furnace system of the present invention is a system that combines a plasma melting furnace and a low-temperature melting furnace, and consists of a system for discharging uncompleted non-combustible wastes in a low-temperature furnace to a plasma melting furnace and completely discharging the waste through a plasma melting furnace outlet. Low temperature melting furnaces are mainly used to vitrify combustible wastes and are used to treat liquid wastes that are difficult to treat with plasma melting furnaces, and plasma melting furnaces are distinguished for use as a furnace that simultaneously treats combustible and nonflammable.

The slag discharged from the vitrification low-temperature melting furnace is divided into discharge by plasma melting and discharge by drum. Plasma melting furnace is a device for discharging slag and metal by different discharge port. When the slag discharged from the low temperature melting furnace and the slag discharged from the plasma melting furnace have the same characteristics, they can be discharged through the plasma melting furnace outlet.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the drawings.

1 is a plan view of a composite melting furnace apparatus according to an embodiment of the present invention. Fig. 2 is a sectional view of the apparatus of Fig. 1 viewed from the front, and Fig. 3 is a sectional view of the apparatus of Fig. 1 seen from one side.

The composite melting furnace system (1) according to the present invention is composed of two melting furnaces. As shown in the figure, the composite melting furnace apparatus 1 includes a first melting furnace unit 100 at the upper portion and a second melting furnace unit 200 at the lower portion.

The first melting furnace unit 100 is a low-temperature melting furnace that heats materials inside the first melting space 120 by induction coils to vitrify them. The bottom portion of the first melting furnace unit 100 is formed in an inclined bottom portion shape. Two outlets are formed in the inclined bottom, and a first outlet (140) for discharging the upper melt from the upper portion of the inclined bottom portion to the outside of the apparatus, a lower melt and a non-melted non- To the second melting space (220) of the second melting furnace unit (200).

The first outlet 140 is opened and closed by a shut-off bar 150 driven up and down to discharge the melt. The shut-off bar 150 is driven by a shut-off bar driving device above the low-temperature melting furnace, and periodically opens and closes the first outlet 140 during operation to discharge the melted material (slag) to the outside of the apparatus. The melted material discharged through the first outlet 140 constitutes the apparatus to be charged directly into the slag drum 600. When the slag drum 600 is directly charged, there is an advantage that post-treatment after melting of the hazardous waste becomes easier.

The melting space of the first furnace unit 100 is formed to include a plurality of metal sector assemblies 160. 4 is a cross-sectional view of a first furnace unit 100 metal sector assembly 160 according to an embodiment of the present invention. 5 is a cross-sectional view of the first furnace unit 100 according to an embodiment of the present invention in a vertical direction so as to coincide with the flow direction of the cooling water of the metal sector 161. As shown in FIG. As shown in FIG. 5, a plurality of metal sectors 161 having different cooling flow paths at a portion connected to the cooling water inlet pipe 170 and the cooling water discharge pipe 180 are assembled to constitute the outer wall of the melting space of the low-temperature melting furnace . As shown, a plurality of metal sectors 161 are generally assembled such that the metal sector assembly 160 is formed to be close to a circular shape when viewed from above. This means that a uniform temperature distribution in the low-temperature melting furnace during induction heating and cooling This is because it is desirable to have.

5, the cooling water supplied to the low-temperature melting furnace metal sector 161 is supplied to the first cooling channel 1611 of the metal sector through the cooling water inlet pipe 170, and the cooling water header 1613 of the metal sector Through the second cooling passage 1612 formed by a plurality of sub-flow paths, and is discharged through the cooling water discharge pipe 180 connected to the upper portion. The second cooling flow passage 1612 in the metal sector 161 is formed on the side adjacent to the melting space relative to the first cooling flow passage 1611. [ The second cooling flow passage 1612 formed by a plurality of sub flow passages is formed close to the melting space so that the area in contact with the cooling water is widened to further improve the cooling efficiency and the first cooling flow passage 1611 is connected to the second cooling passage 1612 are formed outside the melting space, uniform cooling can be achieved.

In the conventional technology, the cooling water supplied to the metal sector is discharged through the single flow path. However, in the present invention, the supplied cooling water is moved downward through the single first cooling flow passage 1611 and two or more And then flows into the second cooling passage 1612 composed of a plurality of sub-flow passages and then flows into a single flow passage under the portion connected to the cooling water discharge pipe 180 and is discharged to the cooling water discharge pipe. As a result, the cooling area of the metal sector surface in contact with the glass melt is increased and the cooling efficiency is improved. The first cooling flow passage 1611 and the second cooling flow passage 1612 are formed substantially parallel to each other in the vertical cross section of the metal sector as shown in the figure.

The cooling water header 1613 serves to change the direction so that the cooling water descending through the first cooling flow path 1611 can rise through the second cooling flow path 1612 having a plurality of sub flow paths, Not only serves to distribute the cooling water to the second cooling flow path 1612 having a plurality of sub flow paths in the flow path 1611 but also serves to cool the lower part of the metal sector.

The bottom surface of the cooling water header 1613 includes a cooling water header assembly plate 1614 and the cooling water header assembly plate 1614 forms a cooling water header 1613 It facilitates the work of the city.

As shown in FIG. 5, it is preferable that the position of the connection between the cooling water pipe 170 and the first cooling channel 1611 is lower than the position of the connection between the cooling water discharge pipe 180 and the second cooling channel 1612. The cooling water discharge pipe 180 is connected to the second cooling flow passage 1612 and the second cooling flow passage 1612 is formed at a portion substantially adjacent to the melt of the metal sector 161 to serve as a main function of the melting furnace cooling. For this reason, in order to form the second cooling passage 1612 as long as possible in the metal sector, the cooling water discharge pipe 170 is connected to the first cooling passage 1611 ) At a position higher than a position connected to the second electrode

6 is a cross-sectional view taken along line A-A ', B-B' and C-C 'in FIG.

Although two sub flow paths of the second cooling flow path 1612 are shown in the present invention, the sub flow paths may be three or more depending on the size of the low temperature melting furnace.

The cooling water flows into the first cooling channel 1611 formed by a single flow path through the cooling water inlet pipe 170 and flows in the cooling water header 1613 passing through the cross section B-B ' And flows into the second cooling flow passage 1612 formed by the two sub flow passages while switching to the direction of the second cooling flow passage 1612 from the cross section A-A 'beyond the cross section B-B' And then discharged through the cooling water discharge pipe 180. [

The cooling water header 1613 is a space in which the cooling water makes a U turn and has the widest cross-sectional area in the flow path portion in the metal sector. The cooling water passing through the cooling flow path at this portion satisfies the high temperature heat of the metal sector portion Can be cooled. The shape of the cross section C-C 'of the cooling water header 1613 may be formed to be close to a triangle as shown and may be formed such that the cross sectional area decreases as the cooling water header assembly plate 1614 approaches the cooling water header assembly plate 1614 . It is preferable that the shape of the triangle is formed in a rounded corner of the triangle so that the flowing resistance of the cooling water does not occur corresponding to the connected first cooling flow path 1611 and the second cooling flow path 1612.

The plurality of sub flow paths forming the second cooling flow path 1612 are each formed to have substantially the same size and the cooling water cools the metal sector while passing through the sub flow paths at substantially the same pressure and flow rate during operation. Substantially the same in the present invention means that the difference is within 10%. The cross sectional areas of the sub flow paths are formed to be substantially equal to each other in order to allow cooling water to flow at the same flow rate so that the glass melt contact surface of the metal sector can be uniformly cooled. The cross-sectional area of the first cooling passage 1611 is larger than the cross-sectional area of the second cooling passage 1612, which is the sum of the sub- Specifically, the cross-sectional area of the first cooling passage 1611 is preferably 1.5 to 2 times the cross-sectional area of the second cooling passage. This is to prevent the cooling efficiency from being lowered because the first cooling flow path 1611 must be formed to be large enough to maintain the flow velocity and pressure of the second cooling flow path 1612 to be suitable for cooling.

The second melting furnace unit (200) is located below the first melting furnace unit (100). It is preferable that the first melting furnace unit 100 is positioned at the upper end of the second melting furnace unit 200 as shown in FIG. However, in another embodiment, the first melting furnace unit 100 may be located on the side of the second melting furnace unit 200, but the lower end of the first melting furnace 120 is created during operation of the second melting furnace unit 200 The first melting furnace unit 100 may be formed to be higher than the maximum height of the melts so that the first melting furnace unit 100 is located at a relatively higher position than the second melting furnace unit 200. In other words, it is also possible that the melt of the first melting furnace unit 100 is located on the side of the structural surface that is movable into the second melting space 220 of the second melting furnace unit 200.

The second melting furnace unit 200 is a plasma melting furnace for heating and melting the waste by the plasma torch 210. Plasma melting furnaces are advantageous in that both flammable wastes and non-combustible wastes can be slagged, but it is difficult to treat liquid wastes. In general, when a liquid waste is to be treated with a plasma melting furnace, pre-treatment such as drying or incineration is necessary. However, in the present invention, because the liquid waste can be treated through the first melting furnace unit 100, almost all kinds of waste treatment can be performed by one apparatus.

The second melting furnace unit 200 has two outlets for separating and discharging slag and metal by density difference. Due to the difference in specific gravity, the heavy metal melt is located at the bottom and the slag with a relatively small specific gravity is located at the top of the melt. Therefore, the second outlet 230 for discharging the slag is formed in the side surface of the second melting space 220 of the second melting furnace unit 200. The second outlet 230 is formed at 5 to 50% of the height of the side surface of the second melting space 220 so that the upper material of the melt generated during the operation of the second melting furnace unit 200 can be discharged. The third outlet 240 is formed at the bottom of the second melting space 220 to discharge the entire amount of the melt including the discharge of the metal melt. Separately discharging the metal melt is for the purpose of easily extracting and recycling precious metals, etc., in order to prepare for the case where the disposal method is changed according to the kind of the material.

In the present invention, as shown in the drawing, the drum inlet 500 is formed so that the waste drum 400 containing the hazardous waste can be directly introduced into the second melting furnace unit 200. In the case of medium-low-level radioactive waste, it is common to store it in a drum and to be stored and transported. When this drum is directly melted without opening or closing it, the possibility of exposure of the radioactive waste to the surrounding environment is reduced and efficient treatment becomes possible.

The second melting furnace unit 200 has a drum charging device capable of automatically charging the waste drum 500. As shown in FIG. 3, the waste drum 400 is in a standby state at the entrance of the drum inlet 500 along an inclined gradient and is rotated by the drum conveying motor 320, the drum transferring cylinder 350, 330 and the second closing door 340 are sequentially interlocked and charged into the second melting space 220 in sequence. When the second hermetically closed door 340 is opened, the drum transfer cylinder 350 pushes one of the waste drums 400 in. When the second hermetically closed door 340 is closed, the first hermetically closed door 330 is opened and the drum conveying motor 320 is rotated to operate the drum conveying device 310 to transfer one waste drum 400 to the drum inlet 500 do.

The loaded waste drum 400 is initially slid in the state of being laid down in the drum loading port 500 and is transferred and melted. In some cases, however, the drum is transferred to a standing state and melted.

The first melting furnace unit 100, which is a low-temperature melting furnace, is disposed such that there is no interference during the operation and maintenance of the plasma torch of the second melting furnace unit 200.

The waste incineration of the first melting furnace unit 100 is performed through a first inlet 110 formed at the upper part as shown in the figure. In addition to the drum inlet 500, the second melting furnace unit 200 has a second inlet 250 formed in the upper portion of the second melting space 220 so that waste other than the drum-type waste can be introduced.

The drum inlet 500 is closed by the first and second closing doors 330 and 340 and the drum inlet 500 is maintained at a negative pressure in order to further block the harmful gas So that the leakage of harmful gas can be prevented in advance.

The first melting furnace unit 100 and the second melting furnace unit 200 according to the present invention can be operated independently according to the amount and type of waste, and can be efficiently processed regardless of the type of hazardous waste through simultaneous operation Do.

The above-described embodiments are illustrative of the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims (10)

A composite melting furnace apparatus for treating hazardous wastes, comprising:
A first furnace unit including a metal sector forming a melt by the induction coil and a plurality of assembled members for forming a melting space for cooling the low temperature melting furnace,
A second melting furnace unit for forming a melt by the plasma torch, and
And an inner outlet formed in the melt space of the first melting furnace unit so as to allow the melt to move to the melting space of the second melting furnace unit;
Wherein the metal sector comprises:
A first cooling flow passage connected to the cooling water inlet pipe and the cooling water discharge pipe at the upper portion and formed as a single flow path from the cooling water inlet pipe to the cooling water header at the lower portion of the metal sector,
And a second cooling channel communicated with the first cooling channel in the cooling water header and formed of at least two independent sub-channels from the cooling water header to the cooling water discharge pipe,
Wherein the second cooling flow path is formed such that a plurality of sub flow paths are parallel to each other and closer to the melting space than the first cooling flow path. The method of claim 1,
Wherein the first furnace unit includes a bottom sloped bottom portion,
And a first outlet for discharging at least a part of the melt to the outside of the composite melting furnace is formed in the upper portion of the inclined bottom portion. 3. The method of claim 2,
And the inner discharge port is formed at a lower portion of the inclined bottom portion of the first melting furnace unit. 3. The method of claim 2,
Wherein the first melting furnace unit includes an outlet shut-off rod for opening and closing the first outlet. The method of claim 1,
Wherein the second melting furnace unit comprises:
A second outlet formed to communicate with at least a part of the side surface of the melting space,
And a third outlet formed to communicate with a bottom portion of the melting space. The method of claim 1,
And the inner discharge port of the first melting furnace unit is formed so as to communicate with a ceiling portion of the melting chamber of the second melting furnace unit. The method of claim 1,
Wherein the second melting furnace unit includes a drum loading port for introducing the drum into the melting space. The method of claim 1,
Wherein the cooling water header is formed such that cooling water moving downward through the first cooling channel can be U-turned upward through the second cooling channel. delete delete
KR1020150127377A 2015-09-09 2015-09-09 Combined melting device having metallic sector KR101569758B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101661112B1 (en) * 2015-08-12 2016-09-30 한국수력원자력 주식회사 Drum type waste feeding apparatus of a plasma melter
CN110396432A (en) * 2019-07-26 2019-11-01 西安航天源动力工程有限公司 A kind of Horizontal water cooling wall type plasma gasification furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101661112B1 (en) * 2015-08-12 2016-09-30 한국수력원자력 주식회사 Drum type waste feeding apparatus of a plasma melter
CN110396432A (en) * 2019-07-26 2019-11-01 西安航天源动力工程有限公司 A kind of Horizontal water cooling wall type plasma gasification furnace

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