JPH0470364B2 - - Google Patents
Info
- Publication number
- JPH0470364B2 JPH0470364B2 JP17331386A JP17331386A JPH0470364B2 JP H0470364 B2 JPH0470364 B2 JP H0470364B2 JP 17331386 A JP17331386 A JP 17331386A JP 17331386 A JP17331386 A JP 17331386A JP H0470364 B2 JPH0470364 B2 JP H0470364B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion gas
- furnace
- blowing
- combustion
- converter
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 50
- 239000000567 combustion gas Substances 0.000 claims description 47
- 238000007664 blowing Methods 0.000 claims description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 239000004449 solid propellant Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 26
- 239000002994 raw material Substances 0.000 claims description 21
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims 3
- 239000007921 spray Substances 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- 239000003575 carbonaceous material Substances 0.000 description 10
- 239000003245 coal Substances 0.000 description 10
- 239000000446 fuel Substances 0.000 description 8
- 230000002411 adverse Effects 0.000 description 7
- 239000000571 coke Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000007670 refining Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- -1 and recently Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えば屑鉄等の被溶解原料を溶解し
て溶綱を製造する電気炉又は転炉における燃焼ガ
ス吹き込み方法及び該方法の実施に適した吹き込
み装置に関し、特に、比較的多量の灰分を含有す
る固体燃料を用いる場合の、該固体燃料中の灰分
による溶綱への悪影響を防止できるようにした方
法及び装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for blowing combustion gas into an electric furnace or a converter for producing molten steel by melting raw materials to be melted, such as scrap iron, and a method for implementing the method. The present invention relates to a suitable blowing device, and in particular to a method and device capable of preventing the adverse effects of the ash in the solid fuel on the molten metal when using a solid fuel containing a relatively large amount of ash.
一般に、屑鉄等を溶かして溶綱を製造する方法
として電気炉が採用されており、また最近では転
炉による鉄屑精錬が開発されている。
Generally, electric furnaces are used as a method for melting scrap iron and the like to produce molten steel, and recently, iron scrap refining using a converter has been developed.
第３図は転炉による鉄屑精錬を示す。この方法
は転炉本体１０内の底部にコークス１１を入れ、
その上部に屑鉄等の原材料１３を充填し、この状
態で上記底部から酸素１２を吹き付けながら燃焼
させ、さらに炉本体１０の上方から挿入されたラ
ンスを用いて、酸素１２及び固体燃料、例えば微
粉状の炭材１４を吹き込んで精錬するようにした
方法である。これによると電気炉に比べて２割の
コスト低減になる。 Figure 3 shows iron scrap refining using a converter. In this method, coke 11 is placed at the bottom of the converter body 10,
The upper part of the furnace is filled with raw material 13 such as scrap iron, and in this state, oxygen 12 is blown from the bottom of the furnace while being combusted. Furthermore, using a lance inserted from above the furnace body 10, oxygen 12 and solid fuel, e.g. This is a method in which charcoal material 14 is blown in for refining. According to this, the cost will be reduced by 20% compared to an electric furnace.
また従来用いられている転炉においても炭材を
吹き込むことが行われている。これは、製鋼プロ
セスを連続化するため溶綱を転炉に注入する前の
溶銑輸送中に脱ケイ、脱リン等の溶銑予備処理が
行われているが、その結果溶綱中の可燃物が不足
することから、転炉内に酸素を吹き込んでも温度
上昇しない問題があり、その熱補償として転炉内
にランスを用いて炭材を吹き込むものである。 Carbon material is also injected into conventional converters. In order to make the steelmaking process continuous, hot metal pretreatment such as desilicification and dephosphorization is carried out during the transportation of the hot metal before it is injected into the converter, but as a result, combustibles in the hot metal are removed. Due to the lack of oxygen, there is a problem in that even if oxygen is blown into the converter, the temperature does not rise, and to compensate for this, carbonaceous material is blown into the converter using a lance.
〔発明が解決しようとする問題点〕
上記従来方法は、炭材等の固体燃料を炉内に直
接吹き込む方法であるが、この固体燃料は一般に
灰分を比較的多量に含有しており、これが溶綱に
悪影響を及ぼすという、固体燃料を使用する場合
には避けられない致命的な問題がある。[Problems to be solved by the invention] The above conventional method is a method in which solid fuel such as carbonaceous material is injected directly into the furnace, but this solid fuel generally contains a relatively large amount of ash, which is dissolved. There is a fatal problem that cannot be avoided when using solid fuel, which is that it has a negative effect on the rope.
また炭材を転炉内に吹き込む場合は、炉内が
CO等の還元性ガスで占められ、かつ炭材の炉内
滞留時間（燃焼時間）が短いため、吹き込まれた
炭材が完全燃焼せず、未燃焼のまま排出され易い
ことから、溶綱に充分な熱補償を与えることがで
きないという問題がある。 Also, when blowing carbonaceous material into the converter, the inside of the furnace
Because it is dominated by reducing gases such as CO and the residence time (combustion time) of carbonaceous material in the furnace is short, the injected carbonaceous material does not burn completely and is easily discharged unburned. There is a problem that sufficient thermal compensation cannot be provided.
さらにまた上記転炉による鉄屑精錬の場合は、
炉内に熱源となるコークスを充填しなければなら
ない厄介な作業があり、しかも底部から酸素を吹
き付けて燃焼させる方法であることから、酸素吹
込み口が詰まり易く、底吹きのメンテナンスや安
全性に問題がある。 Furthermore, in the case of iron scrap refining using the above converter,
There is a cumbersome process in which the furnace must be filled with coke, which serves as a heat source, and since the combustion method involves blowing oxygen from the bottom, the oxygen inlet is easily clogged, which poses a problem in the maintenance and safety of bottom blowing. There's a problem.
そこで本発明は、上記従来の炭材等の固体燃料
を使用する場合の問題点を解消し、固体燃料を使
用しながら、灰分による溶綱への悪影響を防止で
き、かつ燃焼性を向上させて充分な熱補償を与え
ることができ、さらにメンテナンス性、安全性も
向上できる電気炉又は転炉の燃焼ガス吹き込み方
法及びその装置を提供することを目的としてい
る。 Therefore, the present invention solves the above problems when using conventional solid fuels such as carbonaceous materials, prevents the adverse effects of ash on the molten steel, and improves combustibility while using solid fuels. It is an object of the present invention to provide a method and apparatus for blowing combustion gas into an electric furnace or a converter, which can provide sufficient heat compensation and also improve maintainability and safety.
本願発明者等は、従来方法は、炉内に直接固体
燃料を吹き込む方法であるから、該固体燃料中の
灰分が炉内に侵入するのをその構造上防止でき
ず、上述の問題が生じる点に着目した。そして本
発明者等は、固体燃料を炉外で燃焼させれば、灰
分を分離除去した後、炉内に供給できる点に想到
して本発明をなしたものである。
The inventors of the present application pointed out that since the conventional method is a method in which solid fuel is directly blown into the furnace, it is structurally impossible to prevent the ash in the solid fuel from entering the furnace, resulting in the above-mentioned problem. We focused on The present inventors developed the present invention based on the idea that if the solid fuel is burned outside the furnace, the ash can be separated and removed before being fed into the furnace.
即ち、本願の第１発明は、屑鉄等の原材料を溶
解して溶綱を製造する電気炉又は転炉において、
上記原材料を燃焼ガスを吹き付けて予熱し、又は
さらに溶解する電気炉又は転炉の燃焼ガス吹き込
み方法であつて、炉外に設けられた予燃焼室内で
固体燃料を燃焼させて燃焼ガスを発生させるとと
もに、該燃焼ガス中の灰分を上記予燃焼室内で分
離除去し、この灰分が除去された燃焼ガスで、か
つ上記原材料の溶解温度以上の燃焼ガスを上記原
材料を吹き付けるようにしたことを特徴としてい
る。 That is, the first invention of the present application is an electric furnace or a converter for producing molten steel by melting raw materials such as scrap iron,
A method of blowing combustion gas into an electric furnace or converter, in which the above raw materials are preheated or further melted by blowing combustion gas, and solid fuel is burned in a pre-combustion chamber provided outside the furnace to generate combustion gas. In addition, the ash content in the combustion gas is separated and removed in the pre-combustion chamber, and the combustion gas from which the ash content has been removed and which has a temperature higher than the melting temperature of the raw material is sprayed onto the raw material. There is.
また、本願第２の発明は、上記方法を実施する
ための装置であつて、固体燃料を燃焼させて燃焼
ガスを発生させるとともに、該燃焼ガス中の灰分
を分離除去する予燃焼室を炉外に設け、該予燃焼
室からの上記灰分が除去された燃焼ガスで、かつ
上記原材料の溶解温度以上の燃焼ガスを炉内に導
入する導入孔を炉内の原材料に臨むように形成し
たことを特徴としている。 Further, the second invention of the present application is an apparatus for carrying out the above method, in which a solid fuel is combusted to generate combustion gas, and a pre-combustion chamber for separating and removing ash in the combustion gas is installed outside the furnace. and an inlet hole is formed facing the raw material in the furnace for introducing combustion gas from the pre-combustion chamber from which the ash content has been removed and which has a temperature higher than the melting temperature of the raw material into the furnace. It is a feature.
ここで本発明において「予熱し、又はさらに溶
解する」とは、燃焼ガスの吹き付けによつて原
材料を溶解温度近傍の温度（例えば屑鉄の場合
1200℃程度）まで昇温させ、その後はランスから
の酸素の吹き込み等によつて溶解する場合、及び
燃焼ガスの吹き付けによつて予熱するだけでな
く溶解する場合、の両方を含む趣旨である。 Here, in the present invention, "preheating or further melting" means that the raw material is heated to a temperature near the melting temperature (for example, in the case of scrap iron) by spraying combustion gas.
This includes both cases where the temperature is raised to about 1200°C) and then melted by blowing oxygen from a lance, etc., and cases where not only preheating but also melting is done by blowing combustion gas.
また本発明における「灰分の分離除去」は以下
の方法で実現できる。例えば、予燃焼室内に固体
燃料と空気を旋回流が生じるように吹き込みなが
ら燃焼させることにより、その遠心力で灰分を分
離落下させる方法を採用できる。これはサイクロ
ン式スラグタツプ法として従来周知の方法であ
る。 Further, "separation and removal of ash" in the present invention can be realized by the following method. For example, a method can be adopted in which the solid fuel and air are blown into the pre-combustion chamber while being combusted so as to create a swirling flow, and the ash is separated and dropped by the centrifugal force. This is a conventionally known method as the cyclone slug tap method.
さらにまた本発明において「燃焼ガスを原材料
に吹き付ける」とは、燃焼ガスを原材料に当たる
ように炉内に導入するとの意味であり、この吹き
付け速度が高いほど熱交換効率が向上し、本発明
の趣旨に合致する。 Furthermore, in the present invention, "blowing combustion gas onto the raw materials" means introducing the combustion gas into the furnace so as to hit the raw materials, and the higher the spraying speed, the better the heat exchange efficiency, and the purpose of the present invention is to matches.
本発明に係る電気炉又は転炉の燃焼ガス吹き込
み方法及び装置によれば、個体燃料を炉外に設置
した予燃焼室内で燃焼させるようにしたので、燃
料に空気等を確実に混合させることができ、また
予燃焼室内の燃焼負荷（単位時間、単位容積あた
りに燃焼により得られる熱量）を自由に調整でき
るので、本来燃焼性の悪い石炭、コークス等の個
体燃料であつても効率良く略完全に燃焼させるこ
とができる。この略完全燃焼による高温の燃焼ガ
スを炉内に高速で吹き込むことにより、原材料を
高温に予熱でき、さらには溶解できる。また酸素
のランスによる吹き込み等を併用することにより
従来より大幅に溶鋼温度を上昇させることもでき
る。従来のランス吹き込み技術では、燃料と酸素
等を高速で炉内に噴射するので、火災の吹き飛び
が起こり、未燃物が多量に発生するため効率が悪
化する問題が生じていたが、本発明では燃料を予
燃焼室で確実に燃焼させた後、炉内に吹き込むか
らこのような問題を回避できる。またコークスの
炉内充填、酸素の底吹きを必要としないからメン
テナンス、安全性の問題が生じることもない。
According to the method and device for blowing combustion gas into an electric furnace or converter according to the present invention, the solid fuel is combusted in the pre-combustion chamber installed outside the furnace, so that it is possible to reliably mix air, etc. with the fuel. In addition, the combustion load in the pre-combustion chamber (the amount of heat obtained by combustion per unit time and unit volume) can be freely adjusted, so even solid fuels such as coal and coke, which have inherently poor combustibility, can be efficiently and almost completely processed. can be burned. By blowing high-temperature combustion gas from this almost complete combustion into the furnace at high speed, the raw materials can be preheated to a high temperature and further melted. In addition, by using oxygen blowing with a lance, etc., the temperature of molten steel can be increased significantly compared to the conventional method. With conventional lance blowing technology, fuel, oxygen, etc. are injected into the furnace at high speed, which causes the fire to blow over and generates a large amount of unburned material, resulting in a decrease in efficiency.However, with the present invention, This problem can be avoided because the fuel is reliably combusted in the pre-combustion chamber and then blown into the furnace. Furthermore, since it does not require coke filling in the furnace or bottom blowing of oxygen, there are no maintenance or safety problems.
また、上述のように、個体燃料を使用した場合
は、該燃料中の灰分が溶鋼に悪影響を与えるとい
う重大な問題がある。これに対して、本発明で
は、該個体燃料中の灰分を、例えばサイクロン式
スラグタツプ法等の脱灰燃焼により除去した後、
その燃焼ガスを炉内に吹き込むようにしているの
で、灰分の溶鋼に与える悪影響を大幅に減少させ
ることができる。この点は従来の炭材を直接炉内
に吹き込む方法では決して実現できないものであ
る。本発明では、炉外に設置された予燃焼室で個
体燃料を燃焼させるようにしたので、灰分を分離
除去でき、この点が本発明の特徴となつている。 Moreover, as mentioned above, when solid fuel is used, there is a serious problem that the ash content in the fuel has an adverse effect on molten steel. In contrast, in the present invention, after the ash content in the solid fuel is removed by deashing combustion such as a cyclone slag tap method,
Since the combustion gas is blown into the furnace, the adverse effect of ash on molten steel can be significantly reduced. This point cannot be achieved using the conventional method of directly blowing carbonaceous material into the furnace. In the present invention, since the solid fuel is burned in a pre-combustion chamber installed outside the furnace, ash can be separated and removed, which is a feature of the present invention.
以下、本発明の実施例を図について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は本願の第２発明の第１実施例による電
気炉の燃焼ガス吹き込み装置を示す。図におい
て、１は電気炉であり、これは耐火材で内張りさ
れた炉本体１ａの上面に炉蓋１ｂを開閉自在に装
着し、電極６を炉内の溶鋼３に向けて挿入した構
成となつている。なお、１ｃは排気ガスを煙突に
導く煙道である。 FIG. 1 shows a combustion gas blowing device for an electric furnace according to a first embodiment of the second invention of the present application. In the figure, reference numeral 1 denotes an electric furnace, which has a structure in which a furnace lid 1b is attached to the upper surface of the furnace body 1a lined with a refractory material so as to be openable and closable, and an electrode 6 is inserted toward the molten steel 3 in the furnace. ing. Note that 1c is a flue that guides exhaust gas to the chimney.
そして炉本体１ａの側方には、該炉本体１ａに
形成された開口部１ｄに挿通された予燃焼室４が
設置されている。該予燃焼室４は、内面が耐火材
で内張りされた円筒状のもので、その軸芯は炉内
の溶鋼３の中心部を向いている。またこの予燃焼
室４の後壁には燃焼用空気を旋回流をなすように
吹き込むための空気吹込管４ａが接続されてお
り、該空気吹込管４ａには、例えば石炭、コーク
ス等の個体燃料を吹き込むためのバーナ４ｂが挿
入されている。これにより個体燃料と燃焼用空気
とが旋回流をなして予燃焼室４内に吹き込まれ
る。 A pre-combustion chamber 4 is installed on the side of the furnace body 1a, and is inserted through an opening 1d formed in the furnace body 1a. The pre-combustion chamber 4 has a cylindrical shape whose inner surface is lined with a refractory material, and its axis faces the center of the molten steel 3 in the furnace. Further, an air blowing pipe 4a for blowing combustion air into a swirling flow is connected to the rear wall of the pre-combustion chamber 4, and the air blowing pipe 4a is connected to a solid fuel such as coal or coke. A burner 4b for blowing in is inserted. As a result, the solid fuel and the combustion air are blown into the pre-combustion chamber 4 in a swirling flow.
また上記予燃焼室４の先端部には、導入孔５が
形成されており、該導入孔５の軸芯は上記予燃焼
室４の軸芯と同一線上にあり、その噴出口５ａは
炉内中心の溶鋼３の液面付近に向けられている。 Further, an introduction hole 5 is formed at the tip of the pre-combustion chamber 4, the axis of the introduction hole 5 is on the same line as the axis of the pre-combustion chamber 4, and the ejection port 5a is located inside the furnace. It is directed near the liquid level of the molten steel 3 in the center.
さらにまた、図示していないが、上記予燃焼室
４の底壁には、スラグポツトが設けられている。
このスラグポツトは、上記個体燃料の燃焼によつ
て生成される灰を溜めて回収するためのものであ
る。 Furthermore, although not shown, a slag pot is provided on the bottom wall of the pre-combustion chamber 4.
This slag pot is for storing and recovering ash produced by combustion of the solid fuel.
次に上記実施例装置において、第１発明の第１
実施例方法を実施する場合について説明する。 Next, in the above embodiment device, the first
A case will be described in which the example method is implemented.
電極６に通電するとともに、予燃焼室４内にバ
ーナ４ｂから燃料、例えば石炭を送り込み、空気
吹込管４ａから燃焼用空気を吹き込み、点火す
る。するとこれにより上記石炭は予燃焼室４内に
おいて空気とともに旋回流を生じながら燃焼す
る。このとき上記石炭は空燃比が所定値になるよ
うに空気量を自在に調整することにより、略完全
燃焼することとなる。また、このとき、石炭の燃
焼によつて生成された灰は、該予燃焼室４のスラ
グポツト内に落下収容される。この略完全燃焼に
よる高温で、かつ灰分の分離除去された燃焼ガス
が炉本体１ａ内の屑鉄等に吹き付けられ、これに
より屑鉄等は予熱され、さらに溶解される。 While energizing the electrode 6, fuel, such as coal, is fed into the pre-combustion chamber 4 from the burner 4b, and combustion air is blown from the air blowing pipe 4a to ignite. As a result, the coal is burned in the pre-combustion chamber 4 while creating a swirling flow together with the air. At this time, the coal is almost completely combusted by freely adjusting the amount of air so that the air-fuel ratio becomes a predetermined value. Also, at this time, ash generated by the combustion of coal falls and is stored in the slag pot of the pre-combustion chamber 4. The high temperature combustion gas resulting from this almost complete combustion and from which the ash has been separated and removed is blown onto the scrap iron, etc. in the furnace body 1a, thereby preheating the scrap iron, etc. and further melting it.
このように本実施例では、石炭を炉外の予燃焼
室４で燃焼させるようにしたので、燃料と空気と
を確実に混合させることができるとともに、予燃
焼室４内の燃焼負荷を自由に調整でき、本来燃焼
性の極めて悪い個体燃料を略完全に燃焼させるこ
とができ、充分な熱補償が可能となり、その結果
電力単位を低減できる。 In this way, in this embodiment, the coal is combusted in the pre-combustion chamber 4 outside the furnace, so that the fuel and air can be reliably mixed, and the combustion load in the pre-combustion chamber 4 can be freely controlled. The solid fuel, which originally has extremely poor combustibility, can be combusted almost completely, and sufficient heat compensation can be achieved, resulting in a reduction in the power unit.
また、上述のように、個体燃料を直接炉内に吹
き込む従来方法の場合、該個体燃料中の灰分が溶
鋼に悪影響を与えるのを防止できず、致命的な欠
点となつていた。これに対して本実施例では、炉
外の予燃焼室４内で石炭を燃焼させるようにした
ので、該石炭の燃焼ガス中から灰分を除去するこ
とができ、この灰分の非常に少ない、かつ高温の
燃焼ガスを炉内に導入でき、その結果、灰分が多
く含まれた個体燃料を使用しながら、灰分の溶鋼
への悪影響を大幅に低減できる。 Further, as mentioned above, in the case of the conventional method of directly injecting solid fuel into the furnace, it was impossible to prevent the ash content in the solid fuel from having an adverse effect on molten steel, which was a fatal drawback. On the other hand, in this embodiment, since the coal is burned in the pre-combustion chamber 4 outside the furnace, the ash content can be removed from the combustion gas of the coal, and the ash content is very low and High-temperature combustion gas can be introduced into the furnace, and as a result, the negative effect of ash on molten steel can be significantly reduced while using solid fuel with a high ash content.
さらにまた、本実施例では予燃焼室４内に供給
する燃料量と空気量との比率及び燃焼負荷を精度
良く制御することが可能であるから、還元性から
酸化性まで広範囲のガス組成の燃焼ガスを得るこ
とができる。例えば燃焼ガスを還元性のものとす
ればスラグ（Fe2O3）の生成を防止でき、電極６
の酸化を抑制できる。 Furthermore, in this embodiment, since it is possible to accurately control the ratio between the amount of fuel and the amount of air supplied to the pre-combustion chamber 4 and the combustion load, combustion of a wide range of gas compositions from reducing to oxidizing is possible. You can get gas. For example, if the combustion gas is reducing, the formation of slag (Fe 2 O 3 ) can be prevented, and the electrode 6
oxidation can be suppressed.
なお、上記実施例では、電極６に通電しつつ燃
焼ガスで予熱するようにしたが、本発明では様々
なヒートパターンが考えられる。例えば操業開始
時は電極６に通電しないで予燃焼室４からの高温
燃焼ガスの吹き込みのみにより予熱、溶解し、最
後の成分調整時のみ通電するようにしてもよい。 In the above embodiment, the electrode 6 is preheated with combustion gas while being energized, but various heat patterns are conceivable in the present invention. For example, at the start of operation, the electrode 6 may be preheated and melted only by blowing high-temperature combustion gas from the pre-combustion chamber 4 without being energized, and the electrode 6 may be energized only during the final component adjustment.
また、上記実施例では炉本体が耐火材を内張り
した構造であつたが、本発明は勿論水冷構造の電
気炉にも適用できる。 Further, in the above embodiment, the furnace body was lined with a refractory material, but the present invention can of course be applied to an electric furnace having a water-cooled structure.
次に、本願第２発明の第２実施例による転炉の
燃焼ガス吹き込み装置を第２図について説明す
る。 Next, a combustion gas blowing device for a converter according to a second embodiment of the second invention of the present application will be described with reference to FIG.
図において、第１図、第３図と同一符号は同一
又は相当部分を示し、転炉本体１０の上方には予
燃焼室４が設置されている。この予燃焼室４の後
壁には空気吹込管４ａが接続され、該吹込管４ａ
には炭材を吹き込むバーナ４ｃが挿入されてい
る。また上記予燃焼室４の先端部には導入孔５が
形成されており、該導入孔５の噴出口５ａは屑鉄
１３の中央部に向けて開口している。また本実施
例においても、予燃焼室４の底部には、上記第１
図の場合と同様のスラグポツトが形成されてい
る。 In the figure, the same reference numerals as in FIGS. 1 and 3 indicate the same or corresponding parts, and a pre-combustion chamber 4 is installed above the converter main body 10. An air blowing pipe 4a is connected to the rear wall of this pre-combustion chamber 4.
A burner 4c for blowing carbonaceous material is inserted into. Further, an introduction hole 5 is formed at the tip of the pre-combustion chamber 4, and an ejection port 5a of the introduction hole 5 opens toward the center of the scrap iron 13. Also in this embodiment, the bottom of the pre-combustion chamber 4 is provided with the first
A slug pot similar to that shown in the figure is formed.
本実施例装置による燃焼ガス吹き込み方法によ
れば、予燃焼室４内で炭材を燃焼させ、その燃焼
ガスを炉本体１０内の屑鉄１３に吹き付ける。こ
のとき、該燃焼により生成された灰は、上述のス
ラグポツト内に落下収容される。するとこれによ
り高温で、かつ灰分がほとんど含まれていない燃
焼ガスが屑鉄１３に吹き付けられ、該屑鉄１３が
予熱、溶融されることとなる。またこれと同時に
ランス１２から酸素が吹き込まれる。 According to the method of blowing combustion gas using the apparatus of this embodiment, carbonaceous material is combusted in the pre-combustion chamber 4, and the combustion gas is blown onto the scrap iron 13 in the furnace body 10. At this time, the ash produced by the combustion falls into the slag pot. As a result, high-temperature combustion gas containing almost no ash is blown onto the scrap iron 13, and the scrap iron 13 is preheated and melted. At the same time, oxygen is blown in from the lance 12.
このように本実施例によると、石炭を炉外の予
燃焼室４内で燃焼させるようにしたので、本来燃
焼性の悪い個体燃料を略完全燃焼させることがで
き、かつ灰分を除去できるから、屑鉄等への熱補
償を灰分による悪影響を回避しながら確実に実現
できる。 According to this embodiment, since the coal is burned in the pre-combustion chamber 4 outside the furnace, the solid fuel, which originally has poor combustibility, can be almost completely combusted, and the ash content can be removed. Heat compensation for scrap iron, etc. can be reliably achieved while avoiding the adverse effects of ash content.
また、本実施例の精錬方法では、コークスを入
れて熱源を作るという面倒な作業が不要になり、
さらに炉本体の底から酸素を吹き込むという従来
方法とは異なり、上方から燃焼ガスを吹き付ける
方法であるから、簡単な構造の炉の採用が可能に
なるとともに、酸素吹き込み口が詰まり易いとい
う問題が生じる余地はなく、その分メンテナン
ス、安全性が向上する。 In addition, the refining method of this example eliminates the troublesome work of adding coke to create a heat source.
Furthermore, unlike the conventional method of blowing oxygen from the bottom of the furnace body, this method blows combustion gas from above, which makes it possible to use a furnace with a simple structure, and at the same time it does not cause the problem that the oxygen blowing port is easily clogged. There is no room left, which improves maintenance and safety.
以上のように、本発明に係る電気炉又は転炉の
燃焼ガス吹き込み方法及び吹き込み装置によれ
ば、炉外で個体燃料を燃焼させるようにしたの
で、本来燃焼性の悪い個体燃料を略完全燃焼させ
ることが可能であり、高温の燃焼ガスを炉内に吹
き込むことができ、それだけ熱補償を充分に行え
る効果がある。
As described above, according to the method and apparatus for blowing combustion gas into an electric furnace or converter according to the present invention, the solid fuel is combusted outside the furnace, so that the solid fuel, which originally has poor combustibility, is almost completely combusted. This allows high-temperature combustion gas to be blown into the furnace, which has the effect of sufficient heat compensation.
また炉外で燃焼させるようにしたので、燃焼ガ
ス中の灰分を分離除去でき、この灰分の少ない燃
焼ガスを炉内に吹き込むことができ、灰分による
溶鋼への悪影響を確実に防止できる効果がある。 In addition, since the combustion is performed outside the furnace, the ash in the combustion gas can be separated and removed, and this combustion gas with a low ash content can be blown into the furnace, which has the effect of reliably preventing the adverse effects of ash on the molten steel. .
第１図は本願の第２発明の第１実施例による電
気炉の燃焼ガス吹き込み装置を示す断面側面図、
第２図は第２実施例による転炉の燃焼ガス吹き込
み装置を示す断面側面図、第３図は従来の転炉の
断面側面図である。
図において、１は電気炉、３は溶鋼、４は予燃
焼室、５は導入孔、１０は転炉、１３は屑鉄（原
材料）である。
FIG. 1 is a cross-sectional side view showing a combustion gas blowing device for an electric furnace according to a first embodiment of the second invention of the present application;
FIG. 2 is a cross-sectional side view showing a combustion gas blowing device for a converter according to a second embodiment, and FIG. 3 is a cross-sectional side view of a conventional converter. In the figure, 1 is an electric furnace, 3 is molten steel, 4 is a pre-combustion chamber, 5 is an introduction hole, 10 is a converter, and 13 is scrap iron (raw material).
Claims (1)
気炉又は転炉において、上記原材料を燃焼ガスを
吹き付けて予熱し、又はさらに溶解する電気炉又
は転炉の燃焼ガス吹き込み方法であつて、炉外に
設けられた予燃焼室内で固体燃料を燃焼させて燃
焼ガスを発生させるとともに、該燃焼ガス中の灰
分を上記予燃焼室内で分離除去し、この灰分が除
去された燃焼ガスで、かつ上記原材料の溶解温度
以上の燃焼ガスを上記原材料に吹き付けるように
したことを特徴とする電気炉又は転炉の燃焼ガス
吹き込み方法。 ２ 屑鉄等の原材料を溶解して溶綱を製造する電
気炉又は転炉において、上記原材料を燃焼ガスを
吹き付けて予熱し、又はさらに溶解する電気炉又
は転炉の燃焼ガス吹き込み装置であつて、固体燃
料を燃焼させて燃焼ガスを発生させるとともに、
該燃焼ガス中の灰分を分離除去する予燃焼室を炉
外に設け、該予燃焼室からの上記灰分が除去され
た燃焼ガスで、かつ上記原材料の溶解温度以上の
燃焼ガスを炉内に導入する導入孔を炉内の原材料
に臨むように形成したことを特徴とする電気炉又
は転炉の燃焼ガス吹き込み装置。[Scope of Claims] 1. In an electric furnace or converter that melts raw materials such as scrap iron to produce molten steel, the combustion gas of the electric furnace or converter that sprays combustion gas on the raw materials to preheat or further melt them. This is a blowing method in which solid fuel is burned in a pre-combustion chamber provided outside the furnace to generate combustion gas, and ash in the combustion gas is separated and removed in the pre-combustion chamber. A method for blowing combustion gas into an electric furnace or a converter, characterized in that combustion gas having a temperature higher than the melting temperature of the raw material is blown onto the raw material. 2. A combustion gas blowing device for an electric furnace or converter that melts raw materials such as scrap iron to produce molten steel, and preheats or further melts the raw materials by blowing combustion gas, In addition to burning solid fuel to generate combustion gas,
A pre-combustion chamber for separating and removing ash in the combustion gas is provided outside the furnace, and combustion gas from which the ash has been removed and whose temperature is higher than the melting temperature of the raw materials is introduced into the furnace. A combustion gas blowing device for an electric furnace or a converter, characterized in that an introduction hole is formed so as to face a raw material in the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61173313A JPS6328818A (en) | 1986-07-23 | 1986-07-23 | Method and device for blowing fuel in to electric furnace or converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61173313A JPS6328818A (en) | 1986-07-23 | 1986-07-23 | Method and device for blowing fuel in to electric furnace or converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6328818A JPS6328818A (en) | 1988-02-06 |
| JPH0470364B2 true JPH0470364B2 (en) | 1992-11-10 |
Family
ID=15958128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61173313A Granted JPS6328818A (en) | 1986-07-23 | 1986-07-23 | Method and device for blowing fuel in to electric furnace or converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6328818A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51126305A (en) * | 1975-04-28 | 1976-11-04 | Kawasaki Heavy Ind Ltd | Preheating arrangement for charge materials to be charged into smeltin g and refining furnaces |
| JPS5637483A (en) * | 1979-09-01 | 1981-04-11 | Ito Taira | Heating furnace |
-
1986
- 1986-07-23 JP JP61173313A patent/JPS6328818A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51126305A (en) * | 1975-04-28 | 1976-11-04 | Kawasaki Heavy Ind Ltd | Preheating arrangement for charge materials to be charged into smeltin g and refining furnaces |
| JPS5637483A (en) * | 1979-09-01 | 1981-04-11 | Ito Taira | Heating furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6328818A (en) | 1988-02-06 |
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