JP3149726B2 - Electric resistance type incineration ash melting furnace and its operation method - Google Patents
Electric resistance type incineration ash melting furnace and its operation methodInfo
- Publication number
- JP3149726B2 JP3149726B2 JP09947195A JP9947195A JP3149726B2 JP 3149726 B2 JP3149726 B2 JP 3149726B2 JP 09947195 A JP09947195 A JP 09947195A JP 9947195 A JP9947195 A JP 9947195A JP 3149726 B2 JP3149726 B2 JP 3149726B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- furnace
- incineration ash
- slag
- melting furnace
- 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.)
- Expired - Lifetime
Links
Landscapes
- Gasification And Melting Of Waste (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、都市ごみおよびその
他の廃棄物を焼却することによって生じる灰を、減量化
および灰中の重金属の不溶出化の目的で、電気抵抗加熱
によって溶融するための電気抵抗式の焼却灰溶融炉に関
し、詳しくは、耐スラグ性に優れた耐火構造の炉壁を有
する電気抵抗式の焼却灰溶融炉およびその操業方法に関
するものである。BACKGROUND OF THE INVENTION The present invention relates to a method for melting ash produced by incineration of municipal solid waste and other wastes by electric resistance heating for the purpose of weight reduction and non-elution of heavy metals in the ash. More specifically, the present invention relates to an electric resistance type incineration ash melting furnace having a fire-resistant structure with excellent slag resistance and a method of operating the same.
【０００２】[0002]
【従来の技術】都市ごみおよびその他の廃棄物（以下、
「ごみ」で総称する）を焼却する焼却プラントの中に
は、焼却後の灰を減量化および灰中の重金属類の不溶出
化の目的で、焼却灰溶融炉を用いて焼却灰を加熱・溶融
し、灰溶融スラグとして排出するプラントが使用されて
いる。ごみ焼却灰の溶融方式には、電気を熱源とするア
ーク加熱方式、プラズマ加熱方式および抵抗加熱方式等
がある。灰が溶融した溶融スラグは温度が約１５００℃
もあり、また、アーク加熱方式やプラズマ加熱方式で
は、高温のアークやプラズマおよび溶融スラグ面が炉内
に露出しているため、炉内雰囲気温度は９００℃以上に
なるため、溶融炉炉壁の内周面の側壁は耐火材からなる
層で構成されている。そして、定期的に耐火材の補修を
実施しながら操業を行っている。2. Description of the Related Art Municipal solid waste and other waste (hereinafter referred to as "waste")
Some incineration plants that incinerate garbage) collect incineration ash using an incineration ash melting furnace for the purpose of reducing ash after incineration and making heavy metals in the ash insoluble. A plant that melts and discharges as ash molten slag is used. As a method of melting refuse incineration ash, there are an arc heating method using electricity as a heat source, a plasma heating method, a resistance heating method, and the like. The temperature of the molten slag in which the ash is melted is about 1500 ° C.
In addition, in the arc heating method and the plasma heating method, since the high-temperature arc, plasma, and molten slag surface are exposed in the furnace, the furnace atmosphere temperature becomes 900 ° C. or more, so that The side wall of the inner peripheral surface is composed of a layer made of a refractory material. The operation is being carried out while periodically repairing the refractory materials.
【０００３】また、一般的に炉内雰囲気はＯ2 を多量に
含む酸化雰囲気の場合が多く、耐スラグ性に優れたカー
ボン系の耐火材を側壁に使用できないため、スラグの浸
食による耐火材の寿命低下をもたらしており、溶融炉操
業におけるランニングコストを引き上げる要因になって
いた。このため、溶融炉炉壁の内周面の側壁の耐火材の
延命・保護対策については、様々な方式が考案されてい
る。In general, the atmosphere in the furnace is often an oxidizing atmosphere containing a large amount of O 2, and a carbon-based refractory material having excellent slag resistance cannot be used for the side wall. The service life has been shortened, and this has been a factor that raises the running cost in operating the melting furnace. For this reason, various methods have been devised to extend the life and protect the refractory material on the inner peripheral side wall of the melting furnace wall.
【０００４】上記の対策としては、特開平４−３６７５
１８号公報に、ロックウール用電気溶融炉の炉壁に関
し、溶融物と接する犠牲耐火物の内面に溶融物の熱で焼
成する真耐火壁を用いる技術が提案されている（以下、
「先行技術１」という）。The above countermeasure is disclosed in Japanese Patent Laid-Open No. Hei 4-3675.
No. 18, with respect to a furnace wall of an electric melting furnace for rock wool, a technique of using a true refractory wall, which is fired by the heat of the melt, on the inner surface of a sacrificial refractory in contact with the melt, has been proposed (hereinafter, referred to as “fire wall”).
"Prior art 1").
【０００５】更に、特開平５−１４１８６８号公報に
は、ロックウール用電気溶融炉に関し、浸食の最も激し
いとされる溶融物と雰囲気の境界面等に大きな熱伝導率
を有する高熱伝導層を具備し、耐火物全体の寿命を平均
化する技術（以下、「先行技術２」という）が提案され
ている。Further, Japanese Patent Application Laid-Open No. 5-141868 discloses an electric melting furnace for rock wool, which is provided with a high thermal conductive layer having a large thermal conductivity at the boundary between the melt and the atmosphere, which is considered to be most eroded. A technique for averaging the life of the entire refractory (hereinafter referred to as “prior art 2”) has been proposed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、先行技
術１、２の方法は、いずれも根本的な解決策でなく、ま
た、炉体の構造が複雑になる場合がある等の問題があっ
た。However, none of the methods of the prior arts 1 and 2 is a fundamental solution, and there are problems that the structure of the furnace body may be complicated.
【０００７】従って、この発明の目的は、上述したよう
な従来の問題点を解決することができる電気抵抗式の焼
却灰溶融炉およびその操業方法を提供することにある。Accordingly, an object of the present invention is to provide an electric resistance type incineration ash melting furnace capable of solving the above-mentioned conventional problems and an operation method thereof.
【０００８】[0008]
【課題を解決するための手段】請求項１記載の発明は、
焼却灰溶融炉の高さ方向中間部の炉壁に溶融スラグの出
滓口を設け、前記溶融炉底面近くの炉壁に溶融メタルの
排出口を設け、前記溶融炉内に焼却灰を投入し、その焼
却灰層を電極が貫通し前記焼却灰の溶融スラグ内に挿入
し、溶融スラグ中に電気を通すことにより電気抵抗加熱
により前記焼却灰を溶融するとともに前記焼却灰を溶融
スラグと溶融メタルとに比重分離して溶融スラグ層およ
びその下の溶融メタル層を形成し、前記溶融スラグを前
記出滓口から、前記溶融メタルは前記排出口からそれぞ
れ別々に出湯する電気抵抗式の焼却灰溶融炉であって、
前記炉壁は、Ｃ：６０ｗｔ．％以上８０ｗｔ．％以下、
且つ、ＳｉＯ2：５ｗｔ．％以下を含有するカーボン系
の耐火材からなる層と、前記カーボン系の耐火材からな
る層の外側の、スタンプ材からなる層と、前記スタンプ
材からなる層の外側の、炉体鉄皮とからなり、前記炉体
鉄皮は水冷構造を有していることに特徴を有するもので
ある。According to the first aspect of the present invention,
A molten slag discharge port is provided on the furnace wall in the middle of the height direction of the incineration ash melting furnace, a discharge port for molten metal is provided on the furnace wall near the bottom of the melting furnace, and incineration ash is charged into the melting furnace. The electrode penetrates the incinerated ash layer and is inserted into the molten slag of the incinerated ash, and electricity is passed through the molten slag to melt the incinerated ash by electric resistance heating and to melt the incinerated ash with the molten slag and molten metal. An electric resistance type incineration ash melting method in which a molten slag layer and a molten metal layer therebelow are formed by specific gravity separation, and the molten slag is separately discharged from the slag port and the molten metal is separately discharged from the discharge port. Furnace,
The furnace wall has a C: 60 wt. % Or more and 80 wt. %Less than,
And SiO 2 : 5 wt. %, A layer made of a carbon-based refractory material containing no more than 10%, a layer made of a stamp material outside the layer made of the carbon-based refractory material, and a furnace shell outside the layer made of the stamp material. And the furnace shell has a water-cooled structure.
【０００９】請求項２記載の発明は、請求項１記載の発
明において、前記カーボン系の耐火材からなる層と前記
スタンプ材からなる層との間に、ＳｉＣ：５５ｗｔ．％
以上、且つ、ＳｉＯ2：５ｗｔ．％以下を含有するＳｉ
Ｃ系の耐火材からなる層を有することに特徴を有するも
のである。According to a second aspect of the present invention, in the first aspect of the invention, SiC: 55 wt.% Is provided between the layer made of the carbon-based refractory material and the layer made of the stamp material. %
Above, and SiO 2 : 5 wt. % Or less
It is characterized by having a layer made of a C-based refractory material.
【００１０】請求項３記載の発明は、焼却灰溶融炉の高
さ方向中間部の炉壁に溶融スラグの出滓口を設け、前記
溶融炉底面近くの炉壁に溶融メタルの排出口を設け、前
記溶融炉内に焼却灰を投入し、その焼却灰層を電極が貫
通し前記焼却灰の溶融スラグ内に挿入し、溶融スラグ中
に電気を通すことにより電気抵抗加熱により前記焼却灰
を溶融するとともに前記焼却灰を溶融スラグと溶融メタ
ルとに比重分離して溶融スラグ層およびその下の溶融メ
タル層を形成し、前記溶融スラグを前記出滓口から、前
記溶融メタルは前記排出口からそれぞれ別々に出湯する
電気抵抗式の焼却灰溶融炉であって、前記炉壁は、Ｃ：
６０ｗｔ．％以上、且つ、ＳｉＯ 2 ：５ｗｔ．％以下を
含有するカーボン系の耐火材からなる層と、前記カーボ
ン系の耐火材からなる層の外側の、スタンプ材からなる
層と、前記スタンプ材からなる層の外側の、炉体鉄皮と
からなり、前記炉体鉄皮は水冷構造を有している電気抵
抗式の焼却灰溶融炉の操業方法において、前記電気抵抗
式の焼却灰溶融炉内に焼却灰を投入し、その焼却灰層を
電極が貫通し前記焼却灰の溶融スラグ内に挿入し、溶融
スラグ中に電気を通すことにより電気抵抗加熱により前
記焼却灰を溶融するとともに前記焼却灰を溶融スラグと
溶融メタルとに比重分離して溶融スラグ層およびその下
の溶融メタル層を形成し、前記溶融スラグを前記出滓口
から、前記溶融メタルは前記排出口からそれぞれ別々に
出湯するに際し、前記溶融炉内の溶融スラグ層の上に未
溶融の焼却灰層を形成することにより炉内雰囲気温度を
６００℃以下の温度に保持し、且つ、炉内の酸素濃度を
２．０％以下に保持し他のガス組成は還元性のガスと水
蒸気とからなすことに特徴を有する、電気抵抗式の焼却
灰溶融炉の操業方法である。[0010] The third aspect of the present invention is a method for manufacturing an incinerated ash melting furnace.
A molten slag discharge port is provided on the furnace wall in the middle of the
An outlet for molten metal is provided on the furnace wall near the bottom of the
The incineration ash is put into the melting furnace, and the electrode penetrates the incineration ash layer.
Through the molten slag of the incinerated ash
The incineration ash by electric resistance heating
While melting the incinerated ash with molten slag and molten metal
To separate the molten slag layer and the molten
The molten slag is formed from the slag port,
The molten metal taps separately from the outlet
An electric resistance type incineration ash melting furnace, wherein the furnace wall is C:
60 wt. % Or more, and SiO 2 : 5 wt. % Or less
A layer made of a carbon-based refractory material,
Of stamping material outside the layer of refractory material
Layer, and a furnace body shell outside the layer made of the stamp material.
The furnace shell is an electric resistor having a water cooling structure.
In the operation method of the resistance type incineration ash melting furnace, the incineration ash is put into the electric resistance type incineration ash melting furnace, the incineration ash layer penetrates the electrode, and is inserted into the melting slag of the incineration ash. The incineration ash is melted by electric resistance heating by passing electricity through the slag, and the incineration ash is separated into a specific gravity of molten slag and molten metal to form a molten slag layer and a molten metal layer thereunder. When the slag is discharged from the slag port and the molten metal is separately discharged from the discharge port, an atmosphere temperature in the furnace is formed by forming an unmelted incinerated ash layer on the molten slag layer in the melting furnace. Electrical resistance type incineration characterized by maintaining the temperature at 600 ° C. or less, maintaining the oxygen concentration in the furnace at 2.0% or less, and using other gas compositions of reducing gas and water vapor. How to operate ash melting furnace It is.
【００１１】[0011]
【作用】焼却灰溶融炉の灰溶融手段として電気抵抗式を
用い、その溶融炉炉壁の内周面の側壁にカーボン系の耐
火材を使用するとともに、その外側にＳｉＣ系の耐火材
を、その外側にスタンプ材を、更に、その外側の外周に
水冷構造を有する炉体鉄皮を使用した耐火構造とするこ
とにより、カーボン系の耐火材を焼却灰溶融炉の炉壁と
して使用することができる。The electric ash melting means of the incineration ash melting furnace uses an electric resistance type, and uses a carbon-based refractory material on the inner peripheral side wall of the furnace wall and a SiC-based refractory material on the outside thereof. By using a stamp material on the outside and a refractory structure using a furnace shell having a water-cooled structure on the outer periphery, a carbon-based refractory material can be used as a furnace wall of an incineration ash melting furnace. it can.
【００１２】焼却灰の溶融手段として、電気抵抗式の溶
融炉を用いることにより、炉内の溶融スラグの上にほぼ
連続的に焼却灰を投入して未溶融の灰層を形成させて炉
内雰囲気温度を６００℃以下の低温にすることができ
る。且つ、これとともに、炉内の酸素濃度を２．０％以
下で他のガス組成は還元性のガスと水蒸気とからなるよ
うに保つ。このようにして溶融炉内を前記の低温且つ還
元雰囲気に保持することにより、カーボン系の耐火材を
炉壁に使用した上記の耐火構造を有する炉壁の耐スラグ
性が向上し、溶融炉の寿命を延ばすことができ、溶融炉
操業におけるランニングコストの低下が図れる。[0012] By using an electric resistance type melting furnace as a means for melting the incinerated ash, the incinerated ash is charged almost continuously on the molten slag in the furnace to form an unmelted ash layer and The ambient temperature can be as low as 600 ° C. or less. At the same time, the oxygen concentration in the furnace is kept at 2.0% or less, and the other gas compositions are kept so as to be composed of reducing gas and water vapor. By maintaining the inside of the melting furnace at the low temperature and the reducing atmosphere as described above, the slag resistance of the furnace wall having the above refractory structure using the carbon-based refractory material for the furnace wall is improved, The service life can be extended, and the running cost in the operation of the melting furnace can be reduced.
【００１３】カーボン系の耐火材としては、Ｃ：６０w
t.%以上、且つ、ＳｉＯ2 ：５wt.%以下のものを使用す
る。Ｃ含有量が６０wt.%未満では、カーボンの耐スラグ
性が十分に発揮できない。ＳｉＯ2 含有量が５wt.%を超
えると、耐火材内部でＳｉＯ2より遊離した酸素により
カーボンが酸化され耐火材の構造組織がもろくなる。As the carbon-based refractory material, C: 60 w
A material having a content of t.% or more and SiO 2 : 5 wt.% or less is used. If the C content is less than 60 wt.%, The slag resistance of carbon cannot be sufficiently exhibited. If the SiO 2 content exceeds 5 wt.%, Carbon is oxidized by oxygen released from SiO 2 inside the refractory material, and the structural structure of the refractory material becomes brittle.
【００１４】また、炉内の還元雰囲気が崩れカーボン系
耐火材が酸化浸食されるような緊急時でも、その外側に
酸化雰囲気中でもいくらか使用できるＳｉＣ系の耐火材
をバックアップとして用いることにより、事故につなが
る前に炉壁温度および冷却水の温度上昇により炉内の状
態を検知することができ、安全が図れる。Further, even in an emergency where the reducing atmosphere in the furnace collapses and the carbon-based refractory material is oxidized and eroded, an SiC-based refractory material which can be used to some extent even in an oxidizing atmosphere is used as a backup to prevent accidents. Before the connection, the condition inside the furnace can be detected by the temperature rise of the furnace wall and the temperature of the cooling water, and safety can be achieved.
【００１５】ＳｉＣ系の耐火材としては、ＳｉＣ：５５
wt.%以上、且つ、ＳｉＯ2 ：５wt.%以下のものを使用す
る。ＳｉＣ含有量が５５wt.%未満では、ＳｉＣの耐スラ
グ性が十分に発揮できない。ＳｉＯ2 含有量が５wt.%を
超えると、耐火材内部でＳｉＯ2 より遊離した酸素によ
りカーボンが酸化され耐火材の構造組織がもろくなる。
ＳｉＣのカーボンが耐火材内部でＳｉＯ2 より遊離した
酸素によりカーボンが酸化され耐火材の構造組織がもろ
くなる。As the SiC-based refractory material, SiC: 55
A material having a content of not less than wt.% and SiO 2 : not more than 5 wt.% is used. If the SiC content is less than 55 wt.%, The slag resistance of SiC cannot be sufficiently exhibited. If the SiO 2 content exceeds 5 wt.%, Carbon is oxidized by oxygen released from SiO 2 inside the refractory material, and the structural structure of the refractory material becomes brittle.
The carbon of SiC is oxidized by oxygen released from SiO 2 inside the refractory material, and the structural structure of the refractory material becomes brittle.
【００１６】更に、炉体鉄皮の外周を溶融に必要な電力
が高くなり過ぎない程度に水冷することによって、溶融
スラグと接する耐火材面（work面）のスラグ流動性を小
さくできることによる延命効果があり、また、いくらか
でも酸素と接触する可能性のある、溶融スラグと接して
いない部分においても、炉内雰囲気が低温で還元性雰囲
気であることおよび外周からの冷却効果のため、酸化さ
れにくく延命が図れる。Furthermore, by extending the outer periphery of the furnace shell with water to such an extent that the electric power required for melting does not become too high, the slag fluidity of the refractory material surface (work surface) in contact with the molten slag can be reduced, thereby extending the life. There is also a possibility that it may come into contact with oxygen, even in a part that is not in contact with the molten slag, because the atmosphere in the furnace is a reducing atmosphere at a low temperature and a cooling effect from the outer periphery, it is difficult to be oxidized. You can extend your life.
【００１７】[0017]
【実施例】次に、この発明を図面を参照しながら説明す
る。Next, the present invention will be described with reference to the drawings.
【００１８】図１および図２はこの発明の実施例に係る
電気抵抗式灰溶融炉を示す断面図である。図１に示すよ
うに、灰溶融炉１ａの炉壁は、Ｃ：６０wt.%以上、且
つ、ＳｉＯ2 ：５wt.%以下を含有するカーボン系の耐火
材からなる層６と、カーボン系耐火材層６の外側の、Ｓ
ｉＣ：５５wt.%以上、且つ、ＳｉＯ2 ：５wt.%以下を含
有するＳｉＣ系の耐火材からなる層７と、ＳｉＣ系耐火
材層７の外側の、スタンプ材からなる層８と、スタンプ
材層８の外側の、水冷ジャケット構造を有する炉体鉄皮
９とからなっている。また、図２は、図１のＳｉＣ系耐
火物層７を使用しない実施例であり、他は図１と同様
に、灰溶融炉１ｂの炉壁はカーボン系耐火材層６とその
外側にスタンプ材層８を設け、スタンプ材層８の外側に
は水冷ジャケット構造の炉体鉄皮９を有している。１３
は、炉壁の高さ方向中間部に設けられた溶融スラグ出滓
口、１４は、炉壁の炉床耐火材１０の近傍に設けられた
溶融メタル排出口、１１は炉蓋、１２は３本の電極であ
る。また、１５は出滓口用耐火材、１６はメタル排出口
用耐火材である。FIGS. 1 and 2 are sectional views showing an electric resistance type ash melting furnace according to an embodiment of the present invention. As shown in FIG. 1, the furnace wall of the ash melting furnace 1a includes a layer 6 made of a carbon-based refractory material containing C: 60 wt.% Or more and SiO 2 : 5 wt.% Or less, and a carbon-based refractory material. S outside layer 6
a layer 7 made of a SiC-based refractory material containing iC: 55 wt.% or more and SiO 2 : 5 wt.% or less, a stamp material layer 8 outside the SiC-based refractory material layer 7, and a stamp material A furnace body shell 9 having a water-cooled jacket structure is provided outside the layer 8. FIG. 2 shows an embodiment in which the SiC-based refractory layer 7 of FIG. 1 is not used. In other respects, as in FIG. 1, the furnace wall of the ash melting furnace 1b has a carbon-based refractory material layer 6 and a stamp formed on the outside thereof. A material layer 8 is provided, and a furnace shell 9 having a water-cooled jacket structure is provided outside the stamp material layer 8. 13
Is a molten slag discharge port provided in the middle part of the furnace wall in the height direction, 14 is a molten metal discharge port provided near the hearth refractory material 10 on the furnace wall, 11 is a furnace cover, and 12 is 3 It is a book electrode. Reference numeral 15 denotes a refractory material for a slag outlet, and 16 denotes a refractory material for a metal outlet.
【００１９】電極１２は、未溶融灰層５を貫通し、溶融
スラグ２内に挿入される。電気抵抗式灰溶融炉１に投入
された焼却灰４は、加熱・溶融され、溶融した焼却灰は
溶融スラグ２と溶融メタル３とに比重分離する。焼却灰
４を連続的または間欠的に投入し、溶融スラグ層２の上
に、未溶融灰層５を形成させてカバーリング層として機
能させ、炉内雰囲気温度を６００℃以下の低温に保持
し、更に、炉内雰囲気の酸素濃度を２．０％以下に保持
し、他のガス組成は還元性のガスと水蒸気とからなるよ
うな操業を行った。これにより、溶融炉内周面の側壁の
カーボン系の耐火材（Ｃ：６０wt.%以上、且つ、ＳｉＯ
2 ：５wt.%以下を含有する）層６を有する本発明溶融炉
の耐スラグ性が向上した。また、炉内の還元雰囲気が崩
れカーボン系の耐火材層６が酸化浸食されるような緊急
時でも、図１においては、その次に酸化雰囲気中でもあ
る程度は使用できるＳｉＣ系の耐火材（ＳｉＣ：５５w
t.%以上、且つ、ＳｉＯ2 ：５wt.%以下を含有する）層
７をバックアップとして用いたことにより、安全が保た
れた。The electrode 12 penetrates the unmelted ash layer 5 and is inserted into the molten slag 2. The incinerated ash 4 charged into the electric resistance type ash melting furnace 1 is heated and melted, and the melted incinerated ash is separated into a molten slag 2 and a molten metal 3 with specific gravity. The incineration ash 4 is continuously or intermittently charged, an unmelted ash layer 5 is formed on the molten slag layer 2 to function as a covering layer, and the furnace atmosphere temperature is maintained at a low temperature of 600 ° C. or less. Further, the operation was performed such that the oxygen concentration in the furnace atmosphere was maintained at 2.0% or less, and the other gas compositions consisted of reducing gas and water vapor. Thereby, the carbon-based refractory material (C: 60 wt.% Or more, SiO 2
2 : The slag resistance of the melting furnace of the present invention having the layer 6 (containing 5 wt.% Or less) was improved. Even in an emergency where the reducing atmosphere in the furnace collapses and the carbon-based refractory material layer 6 is oxidized and eroded, FIG. 1 shows that the SiC-based refractory material (SiC: 55w
By using the layer 7 (containing t.% or more and SiO 2 : 5 wt.% or less) as a backup, the safety was maintained.
【００２０】本実施例において、使用された材質は下記
の通りであった。カーボン系耐火材層６を構成するカー
ボン系の耐火材の成分組成は、Ｃ：約８０wt.%、ＳｉＯ
2 ：約２wt.%、（その他：１８wt.%）であった。ＳｉＣ
系の耐火材層７を構成するＳｉＣ系の耐火材の成分組成
は、ＳｉＣ：約８５wt.%、ＳｉＯ2 ：約３wt.%、（その
他約：１２wt.%）であった。スタンプ材層８を構成する
スタンプ材の成分組成は、主にアルミナであった。炉床
耐火材層１０を構成する耐火材成分組成は、主にカーボ
ンであった。In this example, the materials used were as follows. The composition of the carbon-based refractory material constituting the carbon-based refractory material layer 6 is C: about 80 wt.
2 : about 2 wt.% (Others: 18 wt.%). SiC
The composition of the SiC refractory constituting the refractory material layer 7 was about 85 wt.% For SiC, about 3 wt.% For SiO 2, and about 12 wt.% For others. The component composition of the stamp material constituting the stamp material layer 8 was mainly alumina. The composition of the refractory material constituting the hearth refractory material layer 10 was mainly carbon.
【００２１】更に、炉体鉄皮の外周を水冷ジャケット構
造９で水冷することによって、溶融スラグ層と接する耐
火材面（work面）のスラグ流動性を小さくでき延命効果
があり、また、いくらかでも酸素と接触する可能性のあ
る、溶融スラグと接していない部分でも炉内雰囲気が低
温で還元性であることおよび外周からの冷却効果のた
め、酸化されにくく延命できる。このように、炉内雰囲
気を低温且つ還元性に保持することにより、耐スラグ性
に優れたカーボン系の耐火材を使用することが可能とな
り、灰溶融炉の延命が図れた。Further, by cooling the outer periphery of the furnace shell with water using the water-cooling jacket structure 9, the slag fluidity of the refractory material surface (work surface) in contact with the molten slag layer can be reduced, and a life extension effect can be obtained. Even in a portion that is likely to come into contact with oxygen and is not in contact with the molten slag, the atmosphere in the furnace is low-temperature and reducible, and the effect of cooling from the outer periphery is less likely to be oxidized, thereby extending the life. As described above, by maintaining the furnace atmosphere at a low temperature and reducing property, it becomes possible to use a carbon-based refractory material having excellent slag resistance, thereby extending the life of the ash melting furnace.
【００２２】[0022]
【発明の効果】以上説明したように、この発明の焼却灰
溶融炉は、電気抵抗式を採用し、溶融炉内の溶融スラグ
層の上に未溶融の焼却灰層を形成することにより炉内雰
囲気温度を６００℃以下の低温に保持し、且つ、炉内の
酸素濃度を２．０％以下とし他のガス組成は還元性のガ
スと水蒸気とからなるように保持することにより、耐ス
ラグ性に優れたカーボン系の耐火材を含む炉壁の構造が
使用可能となり、耐溶融スラグ性に優れた焼却灰溶融炉
を得ることができ、灰溶融炉の寿命が延長し、かくし
て、工業上有用な効果がもたらされる。As described above, the incineration ash melting furnace of the present invention employs an electric resistance method and forms an unmelted incineration ash layer on the molten slag layer in the melting furnace. The slag resistance is maintained by maintaining the atmosphere temperature at a low temperature of 600 ° C. or less, and maintaining the oxygen concentration in the furnace at 2.0% or less and maintaining the other gas composition of a reducing gas and water vapor. The furnace wall structure containing a carbon-based refractory material with excellent heat resistance can be used, and an incineration ash melting furnace with excellent melting slag resistance can be obtained, and the life of the ash melting furnace is extended, thus being industrially useful. Effects are provided.
【図１】この発明の実施例に係る電気抵抗式焼却灰溶融
炉を示す断面図である。FIG. 1 is a sectional view showing an electric resistance type incineration ash melting furnace according to an embodiment of the present invention.
【図２】この発明の別の実施例に係る電気抵抗式焼却灰
溶融炉を示す断面図である。FIG. 2 is a sectional view showing an electric resistance incineration ash melting furnace according to another embodiment of the present invention.
１ａ、１ｂ 焼却灰溶融炉 ２ 溶融スラグ ４ 焼却灰 ３ 溶融メタル ５ 未溶融灰層（カバーリング層） ６ カーボン系耐火材層 ７ ＳｉＣ系耐火材層 ８ スタンプ材層 ９ 水冷ジャケット構造を有する炉体鉄皮 １０ 炉床耐火材層 １１ 炉蓋 １２ 電極 １３ 溶融スラグ出滓口 １４ 溶融メタル排出口 １５ 出滓口用耐火材 １６ メタル排出口用耐火材 1a, 1b Incineration ash melting furnace 2 Molten slag 4 Incineration ash 3 Molten metal 5 Unmolten ash layer (covering layer) 6 Carbon-based refractory material layer 7 SiC-based refractory material layer 8 Stamp material layer 9 Furnace body having water cooling jacket structure Iron shell 10 Furnace floor refractory material layer 11 Furnace lid 12 Electrode 13 Molten slag discharge port 14 Molten metal discharge port 15 Refractory material for discharge port 16 Refractory material for metal discharge port
フロントページの続き (56)参考文献 特開 平８−135938（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F23J 1/00 F23J 1/08 F23J 9/00 F23G 5/00 F23G 5/24 - 5/28 F23G 7/00 F23G 5/44 Continuation of the front page (56) References JP-A-8-135938 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) F23J 1/00 F23J 1/08 F23J 9/00 F23G 5 / 00 F23G 5/24-5/28 F23G 7/00 F23G 5/44
Claims (3)
融スラグの出滓口を設け、前記溶融炉底面近くの炉壁に
溶融メタルの排出口を設け、前記溶融炉内に焼却灰を投
入し、その焼却灰層を電極が貫通し前記焼却灰の溶融ス
ラグ内に挿入し、溶融スラグ中に電気を通すことにより
電気抵抗加熱により前記焼却灰を溶融するとともに前記
焼却灰を溶融スラグと溶融メタルとに比重分離して溶融
スラグ層およびその下の溶融メタル層を形成し、前記溶
融スラグを前記出滓口から、前記溶融メタルは前記排出
口からそれぞれ別々に出湯する電気抵抗式の焼却灰溶融
炉であって、 前記炉壁は、Ｃ：６０ｗｔ．％以上８０ｗｔ．％以下、
且つ、ＳｉＯ2：５ｗｔ．％以下を含有するカーボン系
の耐火材からなる層と、前記カーボン系の耐火材からな
る層の外側の、スタンプ材からなる層と、前記スタンプ
材からなる層の外側の、炉体鉄皮とからなり、前記炉体
鉄皮は水冷構造を有していることを特徴とする電気抵抗
式の焼却灰溶融炉。An incineration ash melting furnace is provided with an outlet for molten slag on a furnace wall at an intermediate portion in a height direction, and an outlet for molten metal is provided on a furnace wall near the bottom of the melting furnace. The incineration ash is charged, the incineration ash layer is penetrated by an electrode, inserted into the molten slag of the incinerated ash, and electricity is passed through the molten slag to melt the incinerated ash by electric resistance heating and to remove the incinerated ash. An electric resistance for separating the molten slag and the molten metal from each other to form a molten slag layer and a molten metal layer below the molten slag layer and the molten metal from the slag port and the molten metal from the discharge port separately; An incineration ash melting furnace of the type, wherein the furnace wall has a C: 60 wt. % Or more and 80 wt. %Less than,
And SiO 2 : 5 wt. %, A layer made of a carbon-based refractory material containing no more than 10%, a layer made of a stamp material outside the layer made of the carbon-based refractory material, and a furnace shell outside the layer made of the stamp material. Wherein the furnace shell has a water-cooled structure. An electric resistance type incineration ash melting furnace.
スタンプ材からなる層との間に、ＳｉＣ：５５ｗｔ．％
以上、且つ、ＳｉＯ2：５ｗｔ．％以下を含有するＳｉ
Ｃ系の耐火材からなる層を有する請求項１記載の電気抵
抗式の焼却灰溶融炉。2. The method according to claim 1, further comprising the step of providing a layer of SiC: 55 wt. %
Above, and SiO 2 : 5 wt. % Or less
The electric resistance type incineration ash melting furnace according to claim 1, further comprising a layer made of a C-based refractory material.
融スラグの出滓口を設け、前記溶融炉底面近くの炉壁に
溶融メタルの排出口を設け、前記溶融炉内に焼却灰を投
入し、その焼却灰層を電極が貫通し前記焼却灰の溶融ス
ラグ内に挿入し、溶融スラグ中に電気を通すことにより
電気抵抗加熱により前記焼却灰を溶融するとともに前記
焼却灰を溶融スラグと溶融メタルとに比重分離して溶融
スラグ層およびその下の溶融メタル層を形成し、前記溶
融スラグを前記出滓口から、前記溶融メタルは前記排出
口からそれぞれ別々に出湯する電気抵抗式の焼却灰溶融
炉であって、 前記炉壁は、Ｃ：６０ｗｔ．％以上、且つ、ＳｉＯ 2 ：
５ｗｔ．％以下を含有するカーボン系の耐火材からなる
層と、前記カーボン系の耐火材からなる層の外側の、ス
タンプ材からなる層と、前記スタンプ材からなる層の外
側の、炉体鉄皮 とからなり、前記炉体鉄皮は水冷構造を
有している電気抵抗式の焼却灰溶融炉の操業方法におい
て、 前記電気抵抗式の焼却灰溶融炉内に焼却灰を投入し、そ
の焼却灰層を電極が貫通し前記焼却灰の溶融スラグ内に
挿入し、溶融スラグ中に電気を通すことにより電気抵抗
加熱により前記焼却灰を溶融するとともに前記焼却灰を
溶融スラグと溶融メタルとに比重分離して溶融スラグ層
およびその下の溶融メタル層を形成し、前記溶融スラグ
を前記出滓口から、前記溶融メタルは前記排出口からそ
れぞれ別々に出湯するに際し、前記溶融炉内の溶融スラ
グ層の上に未溶融の焼却灰層を形成することにより炉内
雰囲気温度を６００℃以下の温度に保持し、且つ、炉内
の酸素濃度を２．０％以下に保持し他のガス組成は還元
性のガスと水蒸気とからなすことを特徴とする電気抵抗
式の焼却灰溶融炉の操業方法。3. An incineration ash melting furnace which melts on a furnace wall at an intermediate portion in a height direction.
Provide a slag outlet for the molten slag, and attach it to the furnace wall near the bottom of the melting furnace.
An outlet for molten metal is provided, and incineration ash is injected into the melting furnace.
The electrode penetrates through the incineration ash layer and melts the incineration ash.
By inserting it into the lag and passing electricity through the molten slag
Melting the incinerated ash by electric resistance heating and
Melting incineration ash by separating it into molten slag and molten metal
Forming a slag layer and a molten metal layer thereunder,
The molten slag is discharged from the slag port and the molten metal is discharged
Electric resistance type incineration ash melting with tap water separately from the mouth
A furnace, wherein the furnace wall has a C: 60 wt. % Or more and SiO 2 :
5 wt. % Of carbon-based refractory material
Layer and a layer outside the carbon-based refractory layer.
A layer made of a tamping material and a layer outside the layer made of the stamp material
Side, a furnace body shell , said furnace body shell has a water cooling structure
The operating method of the electric resistance type incineration ash melting furnace
Then, the incineration ash is charged into the electric resistance type incineration ash melting furnace, the incineration ash layer is penetrated by an electrode, inserted into the melting slag of the incineration ash, and electricity is passed through the melting slag. The incinerated ash is melted by heating and the incinerated ash is separated into a specific gravity of molten slag and molten metal to form a molten slag layer and a molten metal layer thereunder. When the metal is discharged separately from the outlet, the atmosphere temperature in the furnace is maintained at a temperature of 600 ° C. or less by forming an unmelted incinerated ash layer on the molten slag layer in the melting furnace, and A method for operating an electric resistance type incineration ash melting furnace, characterized in that the oxygen concentration in the furnace is kept at 2.0% or less and the other gas composition is composed of reducing gas and steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09947195A JP3149726B2 (en) | 1995-04-03 | 1995-04-03 | Electric resistance type incineration ash melting furnace and its operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09947195A JP3149726B2 (en) | 1995-04-03 | 1995-04-03 | Electric resistance type incineration ash melting furnace and its operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08270926A JPH08270926A (en) | 1996-10-18 |
| JP3149726B2 true JP3149726B2 (en) | 2001-03-26 |
Family
ID=14248237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09947195A Expired - Lifetime JP3149726B2 (en) | 1995-04-03 | 1995-04-03 | Electric resistance type incineration ash melting furnace and its operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3149726B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030060570A (en) * | 2002-01-10 | 2003-07-16 | 윤기섭 | High Temperature Melting Apparatus for the DC resistance supplying low voltage |
| CN101858599B (en) * | 2010-07-12 | 2011-06-29 | 常州市三信环保设备有限公司 | Externally-packed structure of garbage incinerator |
-
1995
- 1995-04-03 JP JP09947195A patent/JP3149726B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08270926A (en) | 1996-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3149726B2 (en) | Electric resistance type incineration ash melting furnace and its operation method | |
| JP3590243B2 (en) | Furnace wall cooling structure of electric melting furnace | |
| JP3377906B2 (en) | Method for preventing decrease in fluidity of molten slag in plasma melting furnace | |
| JPH1027687A (en) | Plasma melting furnace | |
| JP3921706B2 (en) | Electrode sealing device for ash melting furnace | |
| JPH10267235A (en) | Melt treatment apparatus for incineration residue and fly ash and method thereof | |
| JPH0694926B2 (en) | Method of melting incineration ash | |
| JP2958605B2 (en) | Melt treatment method for fibrous waste | |
| JP3744668B2 (en) | Ash melting furnace | |
| JP3542263B2 (en) | Furnace wall structure of electric melting furnace | |
| JP3831930B2 (en) | Electrode sealing device for ash melting furnace | |
| JPH11351534A (en) | Waste melting furnace and its refractory material | |
| JPH0798180B2 (en) | Asbestos melting method | |
| JP3714383B2 (en) | Ash melting furnace and method of operating the same | |
| JP3857089B2 (en) | Ash melting treatment method and ash melting treatment apparatus | |
| JPH1019230A (en) | Method for melting treatment of refuse inclineration ash and melting furnace therefor | |
| JP3732561B2 (en) | Simultaneous implementation of iron alloy production and incineration ash melting in an electric furnace | |
| JPH0829061A (en) | Dc arc furnace | |
| JP3757409B2 (en) | Ash melting furnace and method for forming bottom electrode of ash melting furnace | |
| JP3582603B2 (en) | Plasma melting equipment | |
| JPH11207288A (en) | Waste treatment method | |
| JP4467769B2 (en) | Electric resistance melting furnace | |
| JPH10288321A (en) | Electric resistance melting furnace for incineration ash | |
| JPH11108330A (en) | Melting furnace | |
| JP2004152730A (en) | Electrode structure for plasma melting furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313121 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313121 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080119 Year of fee payment: 7 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080119 Year of fee payment: 7 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080119 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090119 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090119 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100119 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100119 Year of fee payment: 9 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100119 Year of fee payment: 9 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110119 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110119 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120119 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120119 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130119 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130119 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140119 Year of fee payment: 13 |
|
| EXPY | Cancellation because of completion of term |