JP3535571B2 - DC arc furnace - Google Patents
DC arc furnaceInfo
- Publication number
- JP3535571B2 JP3535571B2 JP16372394A JP16372394A JP3535571B2 JP 3535571 B2 JP3535571 B2 JP 3535571B2 JP 16372394 A JP16372394 A JP 16372394A JP 16372394 A JP16372394 A JP 16372394A JP 3535571 B2 JP3535571 B2 JP 3535571B2
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- Prior art keywords
- furnace
- refractory material
- wall
- layer
- electrode
- Prior art date
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- Furnace Details (AREA)
Description
【０００１】[0001]
【産業上の利用分野】都市ごみや産業廃棄物は、焼却処
理によって無害化及び減容化した上、その焼却残滓を埋
立投棄することにより処理されているが、焼却残滓や燃
焼排ガスから集塵，除去された煤塵等には、重金属やダ
イオキシン等の有害物質が含まれているため、埋立投棄
後に環境汚染を生じる虞れがある上、埋立地の確保も困
難になりつつあり、実務上様々な問題を生じている。そ
こで、近時においては、焼却残滓や煤塵等を溶融固化す
ることにより、その無害化と一層の減容化を図る方策が
取られている。本発明は、このような焼却残滓や煤塵等
を溶融処理するための直流アーク炉に関するものであ
る。[Industrial field of application] Municipal solid waste and industrial waste are detoxified and reduced in volume by incineration, and the incineration residue is disposed of by landfill. However, dust is collected from the incineration residue and combustion exhaust gas. ， Since the soot and dust that have been removed contain harmful substances such as heavy metals and dioxins, there is a risk that environmental pollution will occur after landfill disposal, and securing landfill sites is becoming difficult. Is causing problems. Therefore, in recent years, measures have been taken to make the incineration residue, soot dust, etc., harmless and further reduce their volume by melting and solidifying them. The present invention relates to a DC arc furnace for melting and processing such incineration residue and soot dust.
【０００２】[0002]
【従来の技術】この種の直流アーク炉は、一般に、図４
又は図５に示す如く、炉壁１，２，３ａ，３ｂを耐火材
で構成し、天井壁１を貫通する上部電極４と炉底たる底
壁３ａ，３ｂに設けた炉底電極５ａ，５ｂとの間で溶湯
６を介してアークを発生させることによって、焼却残滓
や燃焼排ガスから集塵，除去された煤塵等（以下「廃棄
灰」という）を溶融処理するように構成されている。2. Description of the Related Art A DC arc furnace of this type is generally shown in FIG.
Alternatively, as shown in FIG. 5, the furnace walls 1, 2, 3a, 3b are made of a refractory material, and the upper electrode 4 penetrating the ceiling wall 1 and the furnace bottom electrodes 5a, 5b provided on the bottom walls 3a, 3b serving as the furnace bottom. By generating an arc through the molten metal 6 between and, the soot dust and soot dust (hereinafter referred to as "waste ash") removed from the incineration residue and the combustion exhaust gas are melted.
【０００３】而して、図４に示す直流アーク炉（以下
「第１従来炉」という）では、炉底電極５ａが非導電性
耐火材層である炉底３ａに貫通保持させた金属製のピン
や丸棒等で構成されており、図５に示す直流アーク炉
（以下「第２従来炉」という）では、炉底３ｂ全体を炉
底電極５ｂとなしている。すなわち、図５に示す如く、
炉底３ｂを集電板１７と導電性耐火材層１８と耐食性耐
火材層１９とからなる３層構造となすと共に、耐食性耐
火材層１９にこれを貫通して導電性耐火材層１８に接触
する多数の導電体（金属製のピンや丸棒等からなる）２
０…を埋設して、これらが全体として炉底電極５ｂを構
成するように工夫してある。Thus, in the DC arc furnace shown in FIG. 4 (hereinafter referred to as "first conventional furnace"), the bottom electrode 5a is made of metal and is held through the bottom 3a of the non-conductive refractory material layer. The direct current arc furnace (hereinafter referred to as “second conventional furnace”) shown in FIG. 5 is composed of a pin, a round bar and the like, and the entire bottom 3b serves as a bottom electrode 5b. That is, as shown in FIG.
The furnace bottom 3b has a three-layer structure including a current collector plate 17, a conductive refractory material layer 18 and a corrosion resistant refractory material layer 19, and penetrates the corrosion resistant refractory material layer 19 to contact the conductive refractory material layer 18. A large number of conductors (consisting of metal pins, round bars, etc.) 2
0 are buried so that they constitute the furnace bottom electrode 5b as a whole.
【０００４】[0004]
【発明が解決しようとする課題】ところで、廃棄灰を溶
融して得られる溶湯６は、ＳｉＯ2 ，Ａｌ2 Ｏ3 ，Ｃａ
Ｏ等のスラグ成分を含む他、Ｎａ，Ｋ，Ｃａ，Ｃｌ，Ｓ
Ｏ4 ，ＣＯ3 等の塩成分やＰｂ，Ｚｎ，Ｃｄ，Ｃｕ等の
重金属等を含んでおり、極めて強い侵食性を有する。The molten metal 6 obtained by melting the waste ash is composed of SiO 2 , Al 2 O 3 and Ca.
In addition to containing slag components such as O, Na, K, Ca, Cl, S
It contains salt components such as O 4 and CO 3 and heavy metals such as Pb, Zn, Cd and Cu, and has extremely strong corrosiveness.
【０００５】したがって、第１従来炉では、炉底電極５
ａが溶湯６に接触する耐火材層３ａにその表面に露出す
る状態で貫通されているため、両者３ａ，５ａ間の隙間
から溶湯６（特に、溶湯６に含まれるＰｂ，Ｃｕ等の低
粘性低融点金属）が滲入する虞れがあり、電極５ａ及び
耐火材層３ａを侵食，損傷させたり、極端な場合には、
炉底３ａからの脱湯や電極５ａの脱落を生じる虞れがあ
る。さらに、非導電性耐火材層３ａにひびがはいると、
これに溶湯６中の導電性金属が侵入して、電極５ａとの
間に絶縁不良を生じる等、炉運転上からも種々の問題が
生じる。Therefore, in the first conventional furnace, the bottom electrode 5
Since a penetrates the refractory layer 3a which is in contact with the molten metal 6 in a state of being exposed on the surface thereof, the molten metal 6 (especially low viscosity such as Pb and Cu contained in the molten metal 6 is provided from the gap between the both 3a and 5a. (Low melting point metal) may infiltrate the electrode 5a and the refractory material layer 3a, and in extreme cases,
There is a possibility that hot water may be removed from the furnace bottom 3a or the electrode 5a may be dropped. Furthermore, if the non-conductive refractory material layer 3a is cracked,
The conductive metal in the molten metal 6 penetrates into this, resulting in poor insulation between the molten metal 6 and the electrode 5a.
【０００６】一方、第２従来炉では、溶湯６に直接接触
する炉底部分１９を耐食性耐火材で構成していることか
ら、溶湯６による炉底侵食を防止でき、炉底全体を電極
５ｂに構成しているから、上記した問題を生じない。し
かし、炉底３ｂを熱伝導率の高い導電性耐火材層１８を
含む積層構造としているため、炉底３ｂからの放熱量が
多くなり、炉底３ｂからの熱放散を効果的に抑制するた
めには、炉底耐火材層を必要以上に厚くしておかざるを
得ない。さらに、多数の導電体２０…を耐食性耐火材層
１９に均等に埋設しておく必要があるため、炉底構造な
いし炉底電極構造が極めて複雑となり、施工や保守，管
理が面倒である。勿論、第１従来炉と同様に、耐火材以
外の異物２０…が溶湯６が接触する耐火材層１９にその
表面に露出した状態で埋設されているから、溶湯６が滲
入して炉材１９や導電体２０…を損傷させる虞れがあ
る。On the other hand, in the second conventional furnace, since the furnace bottom portion 19 that is in direct contact with the molten metal 6 is made of a corrosion-resistant refractory material, the corrosion of the furnace bottom by the molten metal 6 can be prevented, and the entire furnace bottom is covered by the electrode 5b. Since it is configured, the above problems do not occur. However, since the furnace bottom 3b has a laminated structure including the conductive refractory material layer 18 having high thermal conductivity, the amount of heat released from the furnace bottom 3b increases, and the heat dissipation from the furnace bottom 3b is effectively suppressed. Therefore, the furnace bottom refractory layer must be thicker than necessary. Further, since it is necessary to uniformly embed a large number of conductors 20 ... In the corrosion resistant refractory material layer 19, the furnace bottom structure or the furnace bottom electrode structure becomes extremely complicated, and construction, maintenance and management are troublesome. Of course, as in the first conventional furnace, since the foreign matters 20 other than the refractory material are buried in the refractory material layer 19 with which the molten metal 6 contacts in an exposed state on the surface thereof, the molten metal 6 penetrates and the furnace material 19 And the conductors 20 ... May be damaged.
【０００７】本発明は、第１及び第２従来炉における上
記した問題をすべて解決して、長期に亘って良好な溶融
処理を行いうる直流アーク炉を提供することを目的とす
る。An object of the present invention is to solve all of the above problems in the first and second conventional furnaces, and to provide a DC arc furnace capable of performing excellent melting treatment for a long period of time.
【０００８】[0008]
【課題を解決するための手段】本発明の直流アーク炉に
あっては、上記の目的を達成すべく、特に、炉底たる底
壁を、集電板と２層又は単層の耐火材層とからなる３層
構造又は２層構造となす。すなわち、底壁を、集電板
と、この集電板上に積層形成した断熱性耐火材層と、こ
の断熱耐火材層上に積層形成した耐食性耐火材層とから
なる３層構造となし、或いは集電板上に耐食性及び断熱
性に優れた炉底耐火材層を積層形成した２層構造とな
す。さらに、炉の周壁における内周面部分であって、上
端部が底壁上の溶湯に接触し且つ下端部が集電板に接触
する筒状部分を、導電性耐火材で構成すると共に、炉の
周壁及び上部電極を設けた炉の天井壁を、上記筒状部分
を除いて、非導電性耐火材で構成して、底壁及び筒状部
分を全体として炉底電極となす。なお、本発明にいうア
ーク炉とは、プラズマ炉も含む概念である。In order to achieve the above-mentioned object, in the DC arc furnace of the present invention, in particular, the bottom wall as the furnace bottom is provided with a current collector plate and a two-layer or single-layer refractory material layer. And a three-layer structure or a two-layer structure. That is, the bottom wall has a three-layer structure including a current collector, a heat-insulating refractory material layer laminated on the current collector, and a corrosion-resistant fire-resistant material layer laminated on the heat-insulating fire-resistant material layer. Alternatively, it has a two-layer structure in which a furnace bottom refractory material layer excellent in corrosion resistance and heat insulation is laminated on a current collector plate. Furthermore, the inner peripheral surface portion of the peripheral wall of the furnace, the tubular portion of which the upper end portion contacts the molten metal on the bottom wall and the lower end portion contacts the current collector plate, is made of a conductive refractory material, and the furnace The peripheral wall and the ceiling wall of the furnace provided with the upper electrode are made of a non-conductive refractory material except for the cylindrical portion, and the bottom wall and the cylindrical portion together serve as a furnace bottom electrode. The arc furnace referred to in the present invention is a concept including a plasma furnace.
【０００９】[0009]
【作用】溶湯に接触する周壁の内周面部分（筒状部分）
が、導電性耐火材で構成されており且つ集電板に接触さ
れているから、この内周面部分が電極として機能し、溶
湯を介して上部電極に電流が流れる。その結果、上部電
極と溶湯との間でアークが発生して、アーク熱に加えて
電気抵抗熱が炉内全域で発生することになり、炉内の中
心領域のみならず周壁領域においても良好な溶融処理が
行われる。なお、炉の始動時においては、炉内に上部電
極下から炉底全面に亘って鉄屑等のベースメタル材を敷
いた状態で溶融を開始し、その溶融メタル層と上記内周
面部分とで電極が構成される。したがって、始動用の上
部電極が不要となる。[Function] Inner peripheral surface portion (cylindrical portion) of the peripheral wall that contacts the molten metal
However, since it is made of a conductive refractory material and is in contact with the current collector plate, this inner peripheral surface portion functions as an electrode, and a current flows through the molten metal to the upper electrode. As a result, an arc is generated between the upper electrode and the molten metal, and electric resistance heat is generated in addition to the arc heat in the entire area of the furnace, which is good not only in the central area of the furnace but also in the peripheral wall area. Melt processing is performed. At the time of starting the furnace, melting is started in a state where a base metal material such as iron scrap is laid in the furnace from below the upper electrode to the entire furnace bottom, and the molten metal layer and the inner peripheral surface portion are The electrode is composed of. Therefore, the upper electrode for starting is unnecessary.
【００１０】そして、溶湯が接触する炉壁面は、すべて
耐火材で構成され、第１及び第２従来炉における如き耐
火材以外の異物が全く存在しないことから、炉底表面層
が耐食性耐火材で構成されていることとも相俟って、低
粘性低融点金属等の溶湯滲入による炉壁の侵食，損傷は
これが可及的に防止される。また、炉底を構成する耐火
材として第２従来炉における如く熱伝導率の高い導電性
耐火材が使用されておらず、集電板上の炉底耐火材層を
耐食性及び断熱性を有する２層構造（溶湯に直接触れる
上層は耐食性耐火材層となっている）又は単層構造に構
成していることから、炉底の耐火材層を必要以上に厚く
せずとも、炉底からの放熱を効果的に抑制することがで
きる。The furnace wall surface which the molten metal comes into contact with is entirely made of a refractory material, and since there is no foreign matter other than the refractory material as in the first and second conventional furnaces, the furnace bottom surface layer is made of a corrosion resistant refractory material. In combination with the structure, the erosion and damage of the furnace wall due to the infiltration of molten metal such as low-viscosity low-melting point metal can be prevented as much as possible. Further, as the refractory material constituting the furnace bottom, a conductive refractory material having high thermal conductivity is not used as in the second conventional furnace, and the furnace bottom refractory material layer on the current collector plate has corrosion resistance and heat insulation. Because it has a layered structure (the upper layer that comes into direct contact with the molten metal is a corrosion-resistant refractory layer) or a single-layer structure, the heat release from the furnace bottom does not have to be made thicker than necessary. Can be effectively suppressed.
【００１１】[0011]
【実施例】以下、本発明の構成を図１及び図２に示す実
施例に基づいて具体的に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be specifically described below with reference to the embodiments shown in FIGS.
【００１２】この実施例のアーク炉は、図１に示す如
く、炉壁１，２，３を耐火材で構成し、天井壁１に設け
た上部電極４と炉底たる底壁３に設けた炉底電極５との
間で溶湯６を介してアークを発生させることによって、
焼却残滓や燃焼排ガスから集塵，除去された煤塵等の廃
棄灰を溶融処理するように構成されているが、特に、以
下に説明する如く、底壁３及び周壁２の内周面部分１０
が全体として炉底電極５となすように工夫してある。な
お、上部電極４は、通常のアーク炉と同様に、昇降操作
されるようになっている。In the arc furnace of this embodiment, as shown in FIG. 1, furnace walls 1, 2 and 3 are made of a refractory material, and an upper electrode 4 provided on a ceiling wall 1 and a bottom wall 3 serving as a furnace bottom are provided. By generating an arc between the furnace bottom electrode 5 and the molten metal 6,
Although it is configured to melt and process waste ash such as dust collected and removed from incineration residue and combustion exhaust gas, in particular, as described below, the inner peripheral surface portions 10 of the bottom wall 3 and the peripheral wall 2 are processed.
Is devised so as to form the furnace bottom electrode 5 as a whole. The upper electrode 4 can be moved up and down, as in a normal arc furnace.
【００１３】すなわち、底壁３は、図１に示す如く、集
電板７と、この集電板７上に積層形成した断熱性耐火材
層８と、この断熱耐火材層８上に積層形成した耐食性耐
火材層９と、からなる３層構造に構成されている。That is, the bottom wall 3 is, as shown in FIG. 1, a collector plate 7, a heat-insulating refractory material layer 8 laminated on the collector plate 7, and a laminate formed on the heat-insulating refractory material layer 8. And a corrosion resistant refractory material layer 9 having the above structure.
【００１４】また、周壁２における内周面部分は導電性
耐火材層１０で構成されている。この導電性耐火材層１
０は、図１及び図２に示す如く、上端部が底壁３上の溶
湯６に接触し且つ下端部が集電板７の外周縁部７ａに接
触する筒形状をなしている。なお、導電性耐火材層１０
の上端位置は、該層１０が溶湯６に接触することを必須
条件として、適宜に設定される。The inner peripheral surface portion of the peripheral wall 2 is composed of a conductive refractory material layer 10. This conductive refractory material layer 1
As shown in FIGS. 1 and 2, 0 has a cylindrical shape in which the upper end contacts the molten metal 6 on the bottom wall 3 and the lower end contacts the outer peripheral edge 7 a of the current collector 7. The conductive refractory material layer 10
The upper end position of is properly set on the condition that the layer 10 contacts the molten metal 6.
【００１５】さらに、天井壁１及び周壁２は、上記導電
性耐火材層１０で構成される部分を除いて、非導電性耐
火材で構成されていて、炉底電極５と鉄製等の金属製ケ
ーシング１１とを電気的に絶縁している。Further, the ceiling wall 1 and the peripheral wall 2 are made of a non-conductive refractory material except for the portion made of the conductive refractory material layer 10, and are made of a furnace bottom electrode 5 and a metal such as iron. It is electrically insulated from the casing 11.
【００１６】ところで、各耐火材としては、溶融処理し
ようとする廃棄灰ないし溶湯６の成分等の性状や溶融条
件等に応じて適宜に選定される。例えば、層８を構成す
る断熱性耐火材としては、アルミナ系耐火材やシリカ系
耐火材等が使用され、層９を構成する耐食性耐火材とし
ては、炭化珪素系耐火材やマグネシア−クロム系耐火材
等が使用され、層１０を構成する導電性耐火材として
は、マグネシア−カーボン系耐火材やカーボン系耐火材
等が使用され、天井壁１等を構成する非導電性耐火材と
しては、アルミナ系耐火材等が使用される。By the way, each refractory material is appropriately selected according to the properties of the waste ash to be melt-processed or the components of the molten metal 6, the melting conditions, and the like. For example, an alumina-based refractory material or a silica-based refractory material is used as the heat insulating refractory material forming the layer 8, and a silicon carbide-based refractory material or a magnesia-chromium refractory material is used as the corrosion-resistant refractory material forming the layer 9. Materials, etc. are used, as the conductive refractory material constituting the layer 10, magnesia-carbon refractory material, carbon refractory material, etc. are used, and as the non-conductive refractory material constituting the ceiling wall 1 etc., alumina is used. Fire-resistant materials are used.
【００１７】以上のように構成された直流アーク炉にあ
っては、始動時においては、炉内に上部電極４下から炉
底全面に亘って鉄屑等のベースメタル材を敷いた状態で
溶融を開始すると、その溶融メタル層と導電性耐火材層
１０とで電極が構成され、爾後、溶湯６を介して炉底電
極５から上部電極４に電流が流れて、アークが発生す
る。したがって、アーク熱に加えて電気抵抗熱が発生
し、炉内の中心領域のみならず周壁領域においても良好
な溶融処理が行われる。In the DC arc furnace constructed as described above, at the time of starting, the base metal material such as iron scraps is melted in the furnace from below the upper electrode 4 to the entire bottom surface of the furnace. Then, an electrode is formed by the molten metal layer and the conductive refractory material layer 10. After that, an electric current flows from the furnace bottom electrode 5 to the upper electrode 4 through the molten metal 6, and an arc is generated. Therefore, in addition to arc heat, electric resistance heat is generated, and good melting treatment is performed not only in the central region of the furnace but also in the peripheral wall region.
【００１８】かかる溶融処理においては、溶湯６が接触
する炉壁面は、すべて耐火材で構成され、第１及び第２
従来炉における如き耐火材以外の異物が全く存在しない
ことから、炉底表面層が耐食性耐火材９で構成されてい
ることとも相俟って、低粘性低融点金属等の溶湯滲入に
よる炉壁の侵食，損傷はこれが可及的に防止される。ま
た、炉底３を構成する耐火材として第２従来炉における
如く熱伝導率の高い導電性耐火材を使用されておらず、
しかも耐食性耐火材層９下に断熱性耐火材層８を配して
いることから、炉底３の耐火材層を必要以上に厚くせず
とも、炉底３からの放熱を効果的に抑制することができ
る。また、始動用の上部電極も不要となる。In the melting process, the wall surface of the furnace with which the molten metal 6 contacts is entirely made of refractory material, and the first and second
Since there is no foreign matter other than the refractory material in the conventional furnace at all, the fact that the furnace bottom surface layer is composed of the corrosion-resistant refractory material 9 contributes to the infiltration of the molten metal such as low-viscosity low-melting point metal into the furnace wall. Erosion and damage are prevented as much as possible. Further, as the refractory material forming the furnace bottom 3, the conductive refractory material having high thermal conductivity as in the second conventional furnace is not used,
Moreover, since the heat insulating refractory material layer 8 is arranged below the corrosion resistant refractory material layer 9, the heat radiation from the furnace bottom 3 is effectively suppressed without making the refractory material layer of the furnace bottom 3 thicker than necessary. be able to. Further, the upper electrode for starting is also unnecessary.
【００１９】なお、本発明は上記実施例に限定されるも
のでなく、本発明の基本原理を逸脱しない範囲で適宜に
改良，変更することができる。例えば、上記実施例にお
いては、炉底３を集電板７と耐食性耐火材層９と断熱性
耐火材層８とからなる３層構造としたが、図３に示す如
く、集電板７上の炉底耐火材層９´を耐食性及び断熱性
の何れにも優れた耐火材で構成した単層構造となし、炉
底３を集電板７と耐火材層９´とからなる２層構造に構
成するようにしてもよい。このような場合にも、上記実
施例と同一の作用効果が奏せられることは勿論である。The present invention is not limited to the above-mentioned embodiments, but can be appropriately improved and changed without departing from the basic principle of the present invention. For example, in the above-described embodiment, the furnace bottom 3 has a three-layer structure including the current collector plate 7, the corrosion resistant refractory material layer 9 and the heat insulating refractory material layer 8. However, as shown in FIG. The bottom of the furnace refractory material 9'is a single-layer structure composed of a refractory material having excellent corrosion resistance and heat insulation, and the bottom 3 of the furnace has a two-layer structure composed of a current collector 7 and a refractory material layer 9 '. You may make it comprise. Even in such a case, it goes without saying that the same effects as those of the above embodiment can be obtained.
【００２０】[0020]
【発明の効果】以上の説明からも明らかなように、本発
明の直流アーク炉にあっては、炉底電極を集電板を除い
て耐火材のみで構成するため、電極の損傷がない。しか
も、耐火材層への溶湯滲入がなく、炉底からの脱湯も生
じない。また、炉材の補修と炉底電極の補修とを同時に
行うことができ、これらを各別に行う場合に比して、補
修作業が極めて容易となる。As is apparent from the above description, in the DC arc furnace of the present invention, since the bottom electrode of the furnace is made of only the refractory material except the collector plate, the electrode is not damaged. Moreover, there is no infiltration of molten metal into the refractory material layer, and no molten metal is removed from the furnace bottom. Further, the repair of the furnace material and the repair of the furnace bottom electrode can be performed at the same time, and the repair work becomes extremely easy as compared with the case where these are performed separately.
【００２１】また、集電板上の炉底耐火材層を、溶湯に
接触する上層を耐食性耐火材で構成すると共に下層を断
熱性耐火材で構成してなる上下２層構造となし、または
耐食性及び断熱性の何れにも優れた耐火材からなる単層
構造となしたから、強い侵食性を有する溶湯に対しても
炉材の長寿命化を図ることができ、耐火材層を必要以上
に厚くせずとも、炉底からの熱放散を効果的に抑制する
ことができる。Further, the furnace bottom refractory material layer on the current collector plate is not composed of an upper and lower two-layer structure in which the upper layer in contact with the molten metal is a corrosion resistant refractory material and the lower layer is a heat insulating refractory material, or the corrosion resistance is And because it has a single layer structure made of refractory material excellent in both heat insulation properties, it is possible to extend the life of the furnace material even for molten metal having strong erosion, and to make the refractory material layer unnecessary. It is possible to effectively suppress heat dissipation from the furnace bottom without increasing the thickness.
【００２２】さらに、周壁の内周面部分を炉底電極の構
成部としたから、アーク熱に加えて電気抵抗熱が炉内全
域で発生することになり、炉内の中心領域のみならず周
壁領域においても良好な溶融処理が行われる。また、始
動用の上部電極も不要となる。Further, since the inner peripheral surface portion of the peripheral wall is the constituent part of the furnace bottom electrode, electric resistance heat is generated in addition to the arc heat throughout the furnace, so that not only the central region in the furnace but also the peripheral wall. Good melting processing is also performed in the region. Further, the upper electrode for starting is also unnecessary.
【図１】本発明に係る直流アーク炉の一実施例を示す縦
断側面図である。FIG. 1 is a vertical sectional side view showing an embodiment of a DC arc furnace according to the present invention.
【図２】図１のII−II線に沿う横断平面図である。FIG. 2 is a cross-sectional plan view taken along the line II-II of FIG.
【図３】他の実施例を示す縦断側面図である。FIG. 3 is a vertical side view showing another embodiment.
【図４】第１従来炉を示す縦断側面図である。FIG. 4 is a vertical side view showing a first conventional furnace.
【図５】第２従来炉を示す縦断側面図である。FIG. 5 is a vertical sectional side view showing a second conventional furnace.
１…天井壁、２…周壁、３…底壁（炉底）、４…上部電
極、５…炉底電極、６…溶湯、７…集電板、８…断熱性
耐火材層、９…耐食性耐火材層、９´…耐食性及び断熱
性を有する炉底耐火材層、１０…導電性耐火材層（周壁
の内周面部分，筒状部分）、１１…ケーシング。DESCRIPTION OF SYMBOLS 1 ... Ceiling wall, 2 ... Peripheral wall, 3 ... Bottom wall (furnace bottom), 4 ... Top electrode, 5 ... Furnace bottom electrode, 6 ... Molten metal, 7 ... Current collecting plate, 8 ... Thermal insulation refractory layer, 9 ... Corrosion resistance Refractory material layer, 9 '... Furnace bottom refractory material layer having corrosion resistance and heat insulation property, 10 ... Conductive refractory material layer (inner peripheral surface portion of peripheral wall, tubular portion), 11 ... Casing.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 考太郎 大阪府大阪市北区堂島浜１丁目３番23号 株式会社タクマ内 (72)発明者 川部 末信 大阪府大阪市北区堂島浜１丁目３番23号 株式会社田熊総合研究所内 (56)参考文献 特開 平５−234675（ＪＰ，Ａ) 特開 平５−203361（ＪＰ，Ａ) 特開 平５−5593（ＪＰ，Ａ) 特開 平４−359791（ＪＰ，Ａ) 実開 平２−131197（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F27B 3/08 F27B 3/14 F27D 11/08 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kotaro Kato 1-3-23, Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture Takuma Co., Ltd. (72) Suenobu Kawabe, 1-chome, Dojimahama, Kita-ku, Osaka-shi, Osaka No. 3-23, Takuma Research Institute Co., Ltd. (56) Reference JP 5-234675 (JP, A) JP 5-203361 (JP, A) JP 5-5593 (JP, A) JP Flat 4-359791 (JP, A) Actual Flat 2-131197 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) F27B 3/08 F27B 3/14 F27D 11/08
Claims (2)
上に積層形成した断熱性耐火材層と、この断熱耐火材層
上に積層形成した耐食性耐火材層とからなる３層構造と
なし、炉の周壁における内周面部分であって、上端部が
底壁上の溶湯に接触し且つ下端部が集電板に接触する筒
状部分を、導電性耐火材で構成すると共に、炉の周壁及
び上部電極を設けた炉の天井壁を、上記筒状部分を除い
て、非導電性耐火材で構成して、底壁及び筒状部分を全
体として炉底電極となしたことを特徴とする、直流アー
ク炉における炉底電極構造。1. A bottom wall, which is a furnace bottom, is composed of a current collector, a heat-insulating refractory layer laminated on the current collector, and a corrosion-resistant fire-resistant layer laminated on the heat-insulating refractory layer. A three-layer structure, the inner peripheral surface portion of the peripheral wall of the furnace, the cylindrical portion of which the upper end contacts the molten metal on the bottom wall and the lower end contacts the current collector plate is made of a conductive refractory material. In addition, the peripheral wall of the furnace and the ceiling wall of the furnace provided with the upper electrode are made of a non-conductive refractory material except for the tubular portion, and the bottom wall and the tubular portion serve as the furnace bottom electrode as a whole. The bottom electrode structure in a DC arc furnace characterized by the above.
断熱性に優れた耐火材からなる炉底耐火材層を積層形成
した２層構造となし、炉の周壁における内周面部分であ
って、上端部が底壁上の溶湯に接触し且つ下端部が集電
板に接触する筒状部分を、導電性耐火材で構成すると共
に、炉の周壁及び上部電極を設けた炉の天井壁を、上記
筒状部分を除いて、非導電性耐火材で構成して、底壁及
び筒状部分を全体として炉底電極となしたことを特徴と
する、直流アーク炉における炉底電極構造。2. The inner wall of the peripheral wall of the furnace, wherein the bottom wall of the furnace bottom has a two-layer structure in which a furnace bottom refractory layer made of a refractory material having excellent corrosion resistance and heat insulation is laminated on a current collector plate. A cylindrical portion of which the upper end is in contact with the molten metal on the bottom wall and the lower end is in contact with the current collector plate is made of a conductive refractory material, and is provided with a furnace peripheral wall and an upper electrode. Of the bottom of the DC arc furnace, characterized in that the ceiling wall of, except for the tubular portion, is made of non-conductive refractory material, and the bottom wall and the tubular portion as a whole serve as a bottom electrode. Electrode structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16372394A JP3535571B2 (en) | 1994-07-15 | 1994-07-15 | DC arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16372394A JP3535571B2 (en) | 1994-07-15 | 1994-07-15 | DC arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0829061A JPH0829061A (en) | 1996-02-02 |
| JP3535571B2 true JP3535571B2 (en) | 2004-06-07 |
Family
ID=15779446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16372394A Expired - Fee Related JP3535571B2 (en) | 1994-07-15 | 1994-07-15 | DC arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3535571B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4446429B2 (en) * | 2003-02-25 | 2010-04-07 | 財団法人電力中央研究所 | Operating method of plasma melting treatment equipment for waste treatment |
| JP4113970B2 (en) * | 2003-03-13 | 2008-07-09 | 富士電機水環境システムズ株式会社 | DC electric resistance type reduction melting furnace |
| JP2007071509A (en) * | 2005-09-09 | 2007-03-22 | Takuma Co Ltd | Bottom electrode structure for electric melting furnace |
-
1994
- 1994-07-15 JP JP16372394A patent/JP3535571B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0829061A (en) | 1996-02-02 |
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