JP2000162389A - Melting device - Google Patents
Melting deviceInfo
- Publication number
- JP2000162389A JP2000162389A JP10335287A JP33528798A JP2000162389A JP 2000162389 A JP2000162389 A JP 2000162389A JP 10335287 A JP10335287 A JP 10335287A JP 33528798 A JP33528798 A JP 33528798A JP 2000162389 A JP2000162389 A JP 2000162389A
- Authority
- JP
- Japan
- Prior art keywords
- melting
- melting tank
- refractory
- furnace
- inner layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は被溶融物を連続的に
加熱・溶融する装置に関し、特に原子力発電等により発
生する放射性廃棄物および耐用年数を過ぎた原子炉の廃
炉廃材等を連続的に溶融・減容処理する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously heating and melting an object to be melted, and more particularly to an apparatus for continuously discharging radioactive waste generated by nuclear power generation or the like and waste material of a nuclear reactor whose service life has expired. The present invention relates to an apparatus for melting and reducing the volume.
【０００２】[0002]
【従来の技術】現在、原子力発電等により大量の低レベ
ル放射性廃棄物が国内において発生している。特にその
中でも金属等の不・難燃性のものはセメント固化され原
子力施設内で保管されており、今後、埋設処理される予
定である。しかし、これらの廃棄物の量は膨大であるた
め、保管・埋設場所の確保が重要となっている。このよ
うな状況から、放射性廃棄物の処理・処分法として、減
容性の低いセメント固化処理法に代わり、減容性の高い
溶融処理が脚光を浴びている。2. Description of the Related Art At present, a large amount of low-level radioactive waste is generated in Japan due to nuclear power generation and the like. In particular, non-flammable materials such as metals are solidified in cement and stored in nuclear facilities, and will be buried in the future. However, since the amount of these wastes is enormous, it is important to secure storage and burial places. Under these circumstances, as a method of treating and disposing of radioactive waste, a melting treatment with a high volume reduction has been spotlighted in place of a cement solidification method with a low volume reduction.
【０００３】溶融処理法としては、導電性発熱体を炉内
に充填した高周波溶融炉，プラズマアーク溶融炉，導電
性耐火物性坩堝を用いた高周波溶融炉等の溶融装置が開
発中である。尚、これらに関する特許としては、導電性
発熱体を炉内に充填した高周波連続溶融炉については
（特開平4−17631号公報），プラズマアーク溶融炉につ
いては（特開平9−49616号公報），導電性耐火物性坩堝
を用いた高周波溶融炉については（特開平6−273591 号
公報）などが挙げられる。As a melting treatment method, a melting apparatus such as a high-frequency melting furnace in which a conductive heating element is filled in a furnace, a plasma arc melting furnace, or a high-frequency melting furnace using a conductive refractory crucible is under development. Patents relating to these include a high-frequency continuous melting furnace in which a conductive heating element is filled in a furnace (Japanese Patent Laid-Open No. 4-17631), a plasma arc melting furnace (Japanese Patent Laid-Open No. 9-49616), A high-frequency melting furnace using a conductive refractory crucible includes, for example, JP-A-6-273591.
【０００４】[0004]
【発明が解決しようとする課題】上記の従来技術の内、
導電性発熱体充填型の高周波連続溶融炉においては、コ
イル下端面と溶解槽底部の位置が近いため、溶解槽底部
近傍での磁束密度が高く、溶解槽底部耐火物およびその
近傍における導電性発熱体および溶融物が高温となり、
炉底の侵食速度が大きかった。SUMMARY OF THE INVENTION Among the above prior arts,
In a high-frequency continuous melting furnace filled with a conductive heating element, the position of the lower end of the coil and the bottom of the melting tank are close, so the magnetic flux density near the bottom of the melting tank is high, and the conductive heat generation at the bottom of the melting tank and the vicinity thereof The body and the melt become hot,
The erosion rate of the hearth was large.
【０００５】また、従来の導電性発熱体充填型の高周波
連続溶融炉においては、溶解槽と損傷の大きい溶解槽底
部が一体構造であった。耐火物は溶融物と接触する面か
ら浸食が進行していくため、常に溶融物と接触する溶解
槽底部の局所的な損傷に対する補修頻度が炉全体の補修
頻度を決定しており、補修に際しては溶解槽の耐火物を
全て交換する大がかりな工事が必要であった。In a conventional high-frequency continuous melting furnace filled with a conductive heating element, the melting tank and the bottom of the severely damaged melting tank are integrally formed. Since the erosion of refractory proceeds from the surface that comes into contact with the melt, the frequency of repair for local damage to the bottom of the melting tank that always contacts the melt determines the repair frequency of the entire furnace. Extensive work was required to replace all refractories in the melting tank.
【０００６】本発明の目的は、溶解槽底部およびその近
傍の溶融物の温度を低下させることにより、炉壁耐火物
の寿命を延長し、炉の補修頻度を低下させると共に、溶
解槽底部を耐火物内層を設置する事により、補修の際の
負担を軽減することにある。An object of the present invention is to reduce the temperature of the melt at and near the bottom of the melting tank, thereby extending the life of the refractory of the furnace wall, reducing the frequency of repairing the furnace, and reducing the temperature of the melting tank at the bottom. The purpose is to reduce the burden of repairs by installing an inner layer.
【０００７】[0007]
【課題を解決するための手段】本発明の溶融炉は、熱源
となる複数の塊状の導電性発熱体をその内部に収納する
溶解槽と上記溶解槽の外部に上記導電性発熱体を誘導加
熱する電磁コイルを備え、投入される廃棄物が上記導電
性発熱体の誘導加熱により溶解しこの導電性発熱体の間
を通過するように、廃棄物の投入口を上記導電性物質が
収納される位置よりも上方位置に有し、且つ上記加熱溶
融された後に導電性発熱体の間を通過する溶融廃棄物を
流れ出す排出口を下部に有する溶融装置において、溶解
槽底部が、溶解槽内の底部に溶解槽とは一体でない耐火
物内層を有する二重構造となっており、更に上記溶解槽
底部の耐火物内層が電磁コイルの下端より下方位置に設
置されていることを特徴としている。According to the present invention, there is provided a melting furnace in which a plurality of massive conductive heating elements serving as heat sources are accommodated in a melting tank, and the conductive heating elements are heated outside the melting tank by induction heating. An electromagnetic coil is provided, and the conductive material is stored in the waste inlet so that the waste to be introduced is melted by induction heating of the conductive heating element and passes between the conductive heating elements. A melting tank having a discharge port for discharging molten waste passing between the conductive heating elements after being heated and melted, wherein the bottom of the melting tank has a bottom in the melting tank. It has a double structure having a refractory inner layer that is not integral with the melting tank, and the refractory inner layer at the bottom of the melting tank is located below the lower end of the electromagnetic coil.
【０００８】誘導コイル下端よりも炉底位置を下げるこ
とにより、炉底近傍の磁束密度を低下させることが可能
である。これにより炉底およびその近傍の溶融物の温度
が低下するので、溶解槽底部耐火物の寿命延長を図るこ
とが可能である。By lowering the furnace bottom position from the lower end of the induction coil, it is possible to reduce the magnetic flux density near the furnace bottom. This lowers the temperature of the melt at the furnace bottom and in the vicinity thereof, so that the life of the refractory at the bottom of the melting tank can be extended.
【０００９】また、溶解槽と溶解槽底部の耐火物内層を
分離し二重構造としたため、従来溶融炉全体の補修頻度
を決定していた溶解槽の補修を、耐火物内層の交換のみ
で済ますことができ、炉の補修にかかる負担を大幅に低
減することが可能である。In addition, since the melting tank and the inner layer of the refractory at the bottom of the melting tank are separated to form a double structure, the repair of the melting tank, which had previously determined the repair frequency of the entire melting furnace, can be performed simply by replacing the inner layer of the refractory. Therefore, it is possible to greatly reduce the burden of repairing the furnace.
【００１０】第２の発明の特徴は、上記溶融装置におい
てコイル下端より下方に設置した溶解層底部の耐火物内
層をＺｒＢ2 もしくはＭｏ−ＺｒＯ2 製とした点にあ
る。A feature of the second invention is that the refractory inner layer at the bottom of the melting layer, which is provided below the lower end of the coil, is made of ZrB 2 or Mo—ZrO 2 in the above melting apparatus.
【００１１】ＺｒＢ2 およびＭｏ−ＺｒＯ2 は溶融金
属，溶融酸化物に対する耐食性が優れているため、溶解
槽底部の耐火物内層に用いることにより炉の保守頻度を
低減することが可能である。また、ＺｒＢ2 およびＭｏ
−ＺｒＯ2 は導電性物質であるため、溶解槽底部をコイ
ル下端よりも下方に置くことにより、溶解槽底部の耐火
物内層に流れる誘導電流を抑制し、耐火物内層のみの極
端な加熱を避けることが可能であると共に、導電性発熱
体を効率よく加熱できるため溶融処理効率を向上するこ
とができる。Since ZrB 2 and Mo—ZrO 2 have excellent corrosion resistance to molten metals and molten oxides, it is possible to reduce the maintenance frequency of the furnace by using them in the refractory inner layer at the bottom of the melting tank. ZrB 2 and Mo
-ZrO 2 since a conductive material, by placing the dissolution tank bottom below the coil lower end, to suppress the induced current flowing through the refractory lining of the melting tank bottom, avoid extreme heating of the refractory lining only In addition, the efficiency of the melting treatment can be improved because the conductive heating element can be efficiently heated.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施例を図を用い
て説明する。図１は、本発明の特徴を最も良く表わして
いる溶融装置の図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram of a melting apparatus that best illustrates the features of the present invention.
【００１３】図１において、被溶融物および導電性発熱
体の投入口は溶解槽の上部に設けられ、溶融物の排出口
は溶解槽下部に設けられており、溶融処理を連続的に行
う。また、溶解槽内の底に熱源となる導電性発熱体を積
層し、炉内に投入された被溶融物を溶融する。導電性発
熱体および被溶融物を誘導加熱するための高周波コイル
は炉側壁の外部に設置されている。また、溶解槽底部が
コイル下端よりも下部にあるため、溶解槽底部近傍の磁
束密度を低下させることが可能である。In FIG. 1, the inlets for the material to be melted and the conductive heating element are provided in the upper part of the melting tank, and the outlet for the molten material is provided in the lower part of the melting tank. In addition, a conductive heating element serving as a heat source is laminated on the bottom in the melting tank, and the material to be melted put in the furnace is melted. A high-frequency coil for inductively heating the conductive heating element and the material to be melted is installed outside the furnace side wall. Further, since the bottom of the melting tank is lower than the lower end of the coil, the magnetic flux density near the bottom of the melting tank can be reduced.
【００１４】これにより炉底およびその近傍の溶融物の
温度が低下するので、炉底耐火物の寿命延長を図ること
が可能である。更に、冷却効率が高い場合は溶融物が炉
底部で凝固し、廃棄物自身が溶解槽底部を構成すること
が可能であり、溶解槽底部の耐火物をコーティングし、
寿命延長を図ることが可能である。As a result, the temperature of the melt at the furnace bottom and in the vicinity thereof decreases, so that the life of the furnace refractory can be extended. Furthermore, when the cooling efficiency is high, the melt solidifies at the bottom of the furnace, and the waste itself can form the bottom of the melting tank, coating the refractory at the bottom of the melting tank,
It is possible to extend the life.
【００１５】また、図１の溶融装置において、溶解層底
部の耐火物内層をＺｒＢ2 もしくはＭｏ−ＺｒＯ2 で作
成することも可能である。溶解槽底部の耐火物内層が溶
融金属，溶融スラグに対する耐食性に優れたＺｒＢ2 お
よびＭｏ−ＺｒＯ2 で作成されているので溶解槽底部の
補修頻度を低くすることができる。また、浸食の激しい
溶解槽底部の補修が耐火物内層の交換のみで行えるた
め、補修の負担を低減可能である。更に、溶解槽底部が
コイル下端よりも下部にあるので、導電性発熱体を効率
よく加熱できると共に、溶解槽底部のみの極端な加熱を
避けることが可能なので、耐火物内層の寿命を延長する
ことができる。In the melting apparatus shown in FIG. 1, the inner layer of the refractory at the bottom of the melting layer can be made of ZrB 2 or Mo—ZrO 2 . Dissolution tank bottom of the refractory lining molten metal, it is possible to reduce the repair frequency dissolution container bottom because it is created by ZrB 2 and Mo-ZrO 2 with excellent corrosion resistance to molten slag. Further, since the repair of the bottom of the melting tank where erosion is severe can be performed only by replacing the inner layer of the refractory, the burden of repair can be reduced. Further, since the bottom of the melting tank is lower than the lower end of the coil, the conductive heating element can be efficiently heated, and extreme heating of only the bottom of the melting tank can be avoided, thereby extending the life of the refractory inner layer. Can be.
【００１６】[0016]
【発明の効果】第１の発明によれば、溶解槽底部の耐火
物内層を誘導コイル下端よりも炉底部を下部にある炉構
造を有しているので、炉底近傍の磁束密度を低下させる
ことが可能である。これにより炉底およびその近傍の溶
融物の温度が低下するので、炉底耐火物の寿命延長を図
ることが可能である。また、溶解槽底部の耐火物内層と
溶解槽が分離できるので、耐火物内層の交換のみで炉底
の補修を行うことができ、補修の負担を軽減可能であ
る。According to the first aspect of the present invention, since the refractory inner layer at the bottom of the melting tank has a furnace structure in which the furnace bottom is lower than the lower end of the induction coil, the magnetic flux density near the furnace bottom is reduced. It is possible. As a result, the temperature of the melt at the furnace bottom and the vicinity thereof decreases, so that it is possible to extend the life of the furnace refractory. Further, since the refractory inner layer at the bottom of the melting tank and the melting tank can be separated, the furnace bottom can be repaired only by replacing the inner layer of the refractory, and the burden of repair can be reduced.
【００１７】第２の発明によれば、溶解槽底部が導電性
耐火物で作成されているので、これを高周波により誘導
加熱することができ、溶融物の排出口の閉塞を防止する
ことができる。また、溶解槽底部がコイル下端よりも下
部にあるので、導電性発熱体を効率よく加熱できると共
に、溶解槽底部のみの極端な加熱を避けることが可能で
ある。According to the second aspect of the present invention, since the bottom of the melting tank is made of a conductive refractory, it can be induction-heated by high frequency, and the blockage of the discharge port of the melt can be prevented. . In addition, since the bottom of the melting tank is below the lower end of the coil, the conductive heating element can be efficiently heated, and extreme heating of only the bottom of the melting tank can be avoided.
【図１】本発明の実施例である溶融装置の断面図。FIG. 1 is a sectional view of a melting apparatus according to an embodiment of the present invention.
１…導電性発熱体、２…溶解槽、３…電磁コイル、４…
被溶融物および導電性発熱体の投入口、５…溶融物の排
出口、６…溶解槽底部耐火物内層。DESCRIPTION OF SYMBOLS 1 ... Conductive heating element, 2 ... Dissolution tank, 3 ... Electromagnetic coil, 4 ...
Inlet for the melt and conductive heating element, 5 for the melt, 6 for the inner layer of the refractory at the bottom of the melting tank.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松尾 俊明 茨城県日立市大みか町七丁目２番１号 株 式会社日立製作所電力・電機開発本部内 (72)発明者 松田 将省 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 (72)発明者 上田 清隆 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 Ｆターム(参考） 4K046 AA01 BA10 CB06 CB16 CB18 CD02 CE08 4K051 AA05 AB05 BB02 BB07 BB08 BE03 DA18 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Matsuo 7-2-1, Omika-cho, Hitachi City, Ibaraki Pref. Electric Power & Electrical Development Division, Hitachi, Ltd. (72) Inventor Masato Matsuda Sachi Hitachi, Ibaraki Prefecture 3-1-1, Machi-cho, Hitachi, Ltd. Hitachi Plant, Hitachi, Ltd. (72) Inventor, Kiyotaka Ueda 3-1-1, Sakaimachi, Hitachi-shi, Ibaraki F-term, Hitachi Plant, Hitachi Plant F-term (reference) 4K046 AA01 BA10 CB06 CB16 CB18 CD02 CE08 4K051 AA05 AB05 BB02 BB07 BB08 BE03 DA18
Claims (2)
の内部に収納する溶解槽と、上記溶解槽の外部に上記導
電性発熱体を誘導加熱する電磁コイルを備え、投入され
る廃棄物が上記導電性発熱体の誘導加熱により溶解し、
この導電性発熱体の間を通過するように、廃棄物の投入
口を上記導電性物質が収納される位置よりも上方位置に
設置し、且つ上記加熱溶融された後に導電性発熱体の間
を通過する溶融廃棄物を流れ出す排出口を下部に有する
溶融装置において、溶解槽内の底部に溶解槽とは一体で
ない耐火物内層を有し、更に上記溶解槽底部の耐火物内
層が電磁コイルの下端より下方位置に設置されているこ
とを特徴とする溶融装置。1. A dissolving tank for accommodating a plurality of massive conductive heating elements serving as heat sources therein, and an electromagnetic coil for inductively heating the conductive heating elements outside the dissolving tank. The substance is melted by the induction heating of the conductive heating element,
An insertion port for waste is installed at a position higher than a position where the conductive substance is stored so as to pass between the conductive heating elements, and a gap between the conductive heating elements after being heated and melted. In a melting apparatus having a discharge port at a lower portion through which molten waste passes therethrough, a refractory inner layer that is not integral with the melting tank is provided at the bottom of the melting tank, and the refractory inner layer at the bottom of the melting tank is a lower end of the electromagnetic coil. A melting device, which is installed at a lower position.
底部の耐火物内層がＺｒＢ2 もしくはＭｏ−ＺｒＯ2 製
であることを特徴とした溶融装置。2. The melting apparatus according to claim 1, wherein the refractory inner layer at the bottom of the melting layer is made of ZrB 2 or Mo—ZrO 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10335287A JP2000162389A (en) | 1998-11-26 | 1998-11-26 | Melting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10335287A JP2000162389A (en) | 1998-11-26 | 1998-11-26 | Melting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000162389A true JP2000162389A (en) | 2000-06-16 |
Family
ID=18286843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10335287A Pending JP2000162389A (en) | 1998-11-26 | 1998-11-26 | Melting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000162389A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003106907A1 (en) * | 2002-06-13 | 2003-12-24 | 旭硝子セラミックス株式会社 | Melting furnace |
| JP2009052764A (en) * | 2007-08-23 | 2009-03-12 | Sharp Corp | High frequency induction furnace and molten material manufacturing method using the same |
| CN113357910A (en) * | 2021-07-14 | 2021-09-07 | 闽南师范大学 | Smelting device for preparing high-entropy alloy material |
-
1998
- 1998-11-26 JP JP10335287A patent/JP2000162389A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003106907A1 (en) * | 2002-06-13 | 2003-12-24 | 旭硝子セラミックス株式会社 | Melting furnace |
| JP2009052764A (en) * | 2007-08-23 | 2009-03-12 | Sharp Corp | High frequency induction furnace and molten material manufacturing method using the same |
| CN113357910A (en) * | 2021-07-14 | 2021-09-07 | 闽南师范大学 | Smelting device for preparing high-entropy alloy material |
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