JPH07197114A - Coke packing layer type vertical smelting furnace - Google Patents
Coke packing layer type vertical smelting furnaceInfo
- Publication number
- JPH07197114A JPH07197114A JP77594A JP77594A JPH07197114A JP H07197114 A JPH07197114 A JP H07197114A JP 77594 A JP77594 A JP 77594A JP 77594 A JP77594 A JP 77594A JP H07197114 A JPH07197114 A JP H07197114A
- Authority
- JP
- Japan
- Prior art keywords
- coke
- furnace
- tuyeres
- smelting furnace
- packing layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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- Manufacture Of Iron (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、炉頂から複数の装入管
を介して供給、形成されたコークス充填層を有し、炉下
部の円周方向に複数本設けた羽口から熱風を吹込んで金
属酸化物を溶融、還元する竪型製錬炉に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a coke packed layer which is supplied and formed from the furnace top through a plurality of charging pipes, and hot air is blown from a plurality of tuyere provided circumferentially at the lower part of the furnace. The present invention relates to a vertical smelting furnace that melts and reduces metal oxide by blowing.
【０００２】[0002]
【従来の技術】コークス充填層方式の竪型製錬炉は、例
えば特開昭５７−１９８２０５号公報で開示されている
ように、コークスが充填された炉下部の円周方向で、上
下２段に設けた羽口前に形成されるレースウェイ内部の
高温域へ、粉状原料を吹き込み、そのレースウェイ内部
の熱とコークス中の炭素により該粉状原料の溶融、還元
を行うものである。その際、該粉状原料の還元よりも溶
融が先行するため、未還元の溶融物が上段羽口から下方
へ滴下する。この未還元溶融物は、コークス充填層内を
滴下中に金属への還元が終了するが、その還元に必要な
熱は、下段羽口から炉内へ送風された空気中の酸素及び
富化酸素とコークスの燃焼で発生したガスから供給され
る。2. Description of the Related Art A vertical coke packed bed type vertical smelting furnace is disclosed in, for example, Japanese Unexamined Patent Publication (Kokai) No. 57-198205. The powdery raw material is blown into the high temperature region inside the raceway formed in front of the tuyere, and the powdery raw material is melted and reduced by the heat inside the raceway and the carbon in the coke. At that time, since the melting of the powdery raw material precedes the reduction, the unreduced melt is dripped downward from the upper tuyeres. This unreduced melt is reduced to metal during the dropping in the coke packed bed, but the heat required for the reduction is the oxygen and enriched oxygen in the air blown from the lower tuyeres into the furnace. And is supplied from the gas generated by the combustion of coke.
【０００３】ところで、この炉へのコークスの装入は、
特開昭５７−１５３０７号公報で開示されているよう
に、従来は炉中心付近と炉壁付近にコークス装入管を設
置して行われていた（図３参照）。この装入方法は、炉
内でのコークス堆積面をできるだけ平坦に保ち、炉内全
面で通気抵抗を均一にして、炉内ガス流の偏流を低減し
ようとするものであった。一般に、コークス充填層方式
の竪型製錬炉では、炉内のコークスを安定して降下させ
るため、かつ炉体への熱負荷を低減するために、炉内中
心部を流れるガス流を強化する（中心部を流れるガスを
多くする）ように操業が行われる。しかし、上記特開昭
５７−１５３０７号公報に記載のコークス装入方法で
は、炉頂中心部に設置したコークス装入管への熱負荷が
非常に大となり、装入管の変形等の問題が生じ、設備保
全に多くの費用が必要となるという問題があった。By the way, the charging of coke into this furnace is
As disclosed in Japanese Patent Application Laid-Open No. 57-15307, conventionally, a coke charging pipe has been installed near the center of the furnace and near the wall of the furnace (see FIG. 3). This charging method is intended to keep the coke deposition surface in the furnace as flat as possible, to make the ventilation resistance uniform over the entire furnace surface, and to reduce the uneven flow of the gas flow in the furnace. Generally, in the vertical smelting furnace of the coke packed bed method, the gas flow flowing through the center of the furnace is strengthened in order to stably lower the coke in the furnace and reduce the heat load on the furnace body. The operation is performed so as to increase the amount of gas flowing through the center. However, in the coke charging method described in JP-A-57-15307, the heat load on the coke charging pipe installed at the center of the furnace top becomes very large, and there is a problem such as deformation of the charging pipe. However, there is a problem in that much cost is required for equipment maintenance.
【０００４】そこで、本出願人は、最近、特願平４−７
１７６４号として、上記特開昭５７−１５３０７号公報
記載の技術で生じる問題点を解決する目的で、図４に示
すようなコークス装入方法を提案した。それは、コーク
ス装入管の中心軸を下段送風羽口が形成するレースウェ
イのほぼ中心と一致するように設定し、コークスの消費
域であるレースウェイの直上に装入管を設置することに
より、炉内コークスの降下を安定させ、炉の安定操業を
図ったものである。Therefore, the present applicant has recently filed Japanese Patent Application No. 4-7.
No. 1764, a coke charging method as shown in FIG. 4 was proposed for the purpose of solving the problems caused by the technique described in JP-A-57-15307. It sets the central axis of the coke charging pipe so that it coincides with the center of the raceway formed by the lower blast tuyere, and by installing the charging pipe directly above the raceway, which is the coke consumption area, This is intended to stabilize the operation of the furnace by stabilizing the fall of the coke in the furnace.
【０００５】しかしながら、この特願平４−７１７６４
号のように、コークス装入管をレースウェイ直上に設置
しても、以下のような別の問題が生じた。すなわち、装
入管から炉内のコークス充填層の表面にコークスが流出
する際、そのコークスの堆積状態は装入管の下端を頂点
とする山形状になるが、この場合は、コークス粒径の大
きい粒子ほど転がる距離が大きくなるため、装入管の直
下では粒径が小さく、装入管から水平方向で遠くに離れ
る程、粒径が大きいコークスが堆積する傾向がある。こ
の状況を、図５の概念図で示す。水平断面でみるとレー
スウェイ位置ではコークス粒径は小さくなり、レースウ
ェイから離れるほどコークス粒径が大きくなる。また、
炉内でコークスの降下する流線は、ほぼ炉シャフト部の
傾きに応じて鉛直方向に流れるので、炉内頂部での水平
断面方向のコークス粒径分布は炉下部においても保存さ
れる。その結果、羽口前で発生したガスは炉の上方へ流
れるが、その際、コークス粒径が小さい領域では通気抵
抗が大きいため、コークス粒径の大きい領域を選択的に
ガスは流れることになる。従って、レースウェイ直上に
装入管を設置すると、羽口付近のコークスは粒径が比較
的小さく、羽口前から水平方向に遠ざかるほどコークス
粒径が大きいので、下段羽口前で発生したガスは炉中心
部、及び隣接する各羽口との間の領域へより流れやすく
なる。上述したように、コークス充填層方式の竪型製錬
炉では、上段羽口から吹き込まれた粉状原料が滴下する
際に、下段羽口前で発生する高温ガスからの熱供給で還
元が進行するので、下段羽口前で発生したガスができる
だけ鉛直上方へ流れ、上段羽口前から滴下する未還元溶
融物と熱交換することが望ましい。However, this Japanese Patent Application No. 4-71764
Even if the coke charging pipe was installed just above the raceway as in No. 6, another problem as described below occurred. That is, when the coke flows out from the charging pipe to the surface of the coke packed layer in the furnace, the coke deposition state has a mountain shape with the lower end of the charging pipe as an apex. Since larger particles have a longer rolling distance, the particle size is smaller immediately below the charging pipe, and coke having a larger particle size tends to be deposited as the distance from the charging pipe increases in the horizontal direction. This situation is shown in the conceptual diagram of FIG. When viewed in a horizontal section, the coke grain size becomes smaller at the raceway position, and the coke grain size becomes larger as the distance from the raceway increases. Also,
Since the streamline of the coke falling in the furnace flows in the vertical direction substantially in accordance with the inclination of the furnace shaft, the coke particle size distribution in the horizontal cross section at the top of the furnace is preserved even in the lower part of the furnace. As a result, the gas generated in front of the tuyere flows upward in the furnace, but at that time, the gas has a large gas flow resistance in the region where the coke particle size is small, so that the gas selectively flows in the region where the coke particle size is large. . Therefore, if a charging pipe is installed directly above the raceway, the coke particle size near the tuyere is relatively small, and the coke particle size increases as it moves further away from the front of the tuyere in the horizontal direction. Flow more easily into the furnace center and into the area between adjacent tuyeres. As described above, in the vertical coke packed bed type vertical smelting furnace, when the powdered raw material blown from the upper tuyeres drips, the reduction proceeds by the heat supply from the high temperature gas generated in front of the lower tuyeres. Therefore, it is desirable that the gas generated in front of the lower tuyeres flows as vertically upward as possible and exchanges heat with the unreduced melt that drops from the front of the upper tuyeres.
【０００６】しかしながら、特願平４−７１７６４号の
コークス装入方法では、以上説明した理由で、上段羽口
前から滴下する未還元溶融物と下段羽口前で発生したガ
スとの効果的な熱交換ができず、下段羽口から供給する
熱が有効に利用されないのである。However, in the coke charging method of Japanese Patent Application No. 4-71764, for the reasons explained above, the unreduced melt dripping from the front of the upper tuyeres and the gas generated in front of the lower tuyeres are effective. The heat cannot be exchanged, and the heat supplied from the lower tuyeres is not effectively used.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、かかる事情
を鑑み、コークスが炉内を安定して降下すると共に、熱
効率の優れた操業ができるコークス充填層方式の竪型製
錬炉を提供することを目的としている。SUMMARY OF THE INVENTION In view of such circumstances, the present invention provides a coke packed bed type vertical smelting furnace capable of stably descending coke in the furnace and operating with excellent thermal efficiency. Is intended.
【０００８】[0008]
【課題を解決するための手段】発明者は、上記目的を達
成するため、本発明で対象としている竪型製錬炉の冷間
縮尺模型を用い、炉内のガス流れと、コークス粒径分布
に関する試験、研究を行った。その際、下段羽口前で発
生するガスが効果的に上段羽口方向へ上昇するために
は、水平方向断面での羽口近傍のコークス粒径を周辺よ
り比較的大きくすることが効果的であることがわかっ
た。本発明は、この知見を具現化したもので、炉上方の
ホッパから複数本の装入管を介してコークスを供給して
形成されたコークス充填層に、炉下部円周方向で上下２
段に設けた複数本の送風用羽口のうち、上段羽口より粉
状の金属酸化物、及びスラグ成分調整用の造滓剤を、下
段羽口より酸素含有ガスを吹込み、該金属酸化物を溶
融、還元するコークス充填層方式の竪型製錬炉におい
て、上記コークス装入管を、その中心軸が炉円周方向で
隣り合う送風羽口の直前に形成されるレースウェイ間の
中間位置になるように設けたことを特徴とするコークス
充填層方式の竪型製錬炉である。In order to achieve the above object, the inventor has used a cold scale model of a vertical smelting furnace, which is the object of the present invention, and has a gas flow in the furnace and a coke particle size distribution. We conducted tests and research on. At that time, in order for the gas generated in front of the lower tuyeres to rise effectively toward the upper tuyeres, it is effective to make the coke grain size in the vicinity of the tuyeres in the horizontal section relatively larger than that of the periphery. I knew it was. The present invention embodies this knowledge, and a coke packed layer formed by supplying coke from a hopper above the furnace through a plurality of charging pipes forms a coke packed layer formed in the lower circumferential direction of the furnace.
Of the multiple blast tuyeres installed in the stage, powdered metal oxide from the upper stage tuyeres and a slag component adjusting agent are blown, and an oxygen-containing gas is blown from the lower stage tuyeres to oxidize the metal. In a vertical coking bed type vertical smelting furnace that melts and reduces matter, the above-mentioned coke charging pipe is formed between the raceways formed immediately before the blast tuyere whose central axis is adjacent in the furnace circumferential direction. This is a coke packed bed type vertical smelting furnace characterized by being installed at a position.
【０００９】[0009]
【作用】本発明では、炉上方のホッパから複数本の装入
管を介してコークスを供給して形成されたコークス充填
層に、炉下部円周方向で上下２段に設けた複数本の送風
用羽口のうち、上段羽口より粉状の金属酸化物、及びス
ラグ成分調整用の造滓剤を、下段羽口より酸素含有ガス
を吹込み、該金属酸化物を溶融、還元するコークス充填
層方式の竪型製錬炉において、上記コークス装入管を、
その中心軸が炉円周方向で隣り合う送風羽口の直前に形
成されるレースウェイ間の中間位置になるように設けた
ので、下段羽口前のコークス粒径をその周辺部より大き
くすることができるようになり、上段羽口前から滴下す
る未還元溶融物と上記下段羽口前で発生する高温ガスと
の接触が容易になる。その結果、熱交換の効率が著しく
増大することになる。以下、図１〜２に基づき、本発明
の内容を説明する。According to the present invention, a plurality of blowers are provided in the upper and lower two stages in the circumferential direction of the lower part of the coke packed bed formed by supplying the coke from the hopper above the furnace through the plurality of charging pipes. Of the tuyeres, powdered metal oxide from the upper tuyeres and slag-forming agent for adjusting the slag component, and oxygen-containing gas are blown from the lower tuyeres to melt and reduce the metal oxides. In the vertical smelting furnace of the layer method, the coke charging pipe,
Since the center axis was set at the middle position between the raceways formed immediately before the adjacent blast tuyeres in the circumferential direction of the furnace, the coke grain size in front of the lower tuyeres should be larger than that of the surrounding area. As a result, it becomes easy to contact the unreduced melt dropped from the front of the upper tuyeres with the hot gas generated in front of the lower tuyeres. As a result, the efficiency of heat exchange is significantly increased. The contents of the present invention will be described below with reference to FIGS.
【００１０】図１は、本発明に係るコークス充填層方式
の竪型精錬炉の概要である。それは、縦断面図の図１
（ａ）より明らかなように、装入管８が、炉上のホッパ
７に蓄積された塊状コークス６を炉内へ供給する構造で
あり、金属酸化物の粉状原料は上段羽口２から吹込ま
れ、酸素含有ガスが下段羽口より吹込まれる。また、平
面図の図１（ｂ）に示したように，下段羽口２’前のレ
ースウェイ３は、正常な操業が行われている際には、い
ずれも上下方向にほぼ同等の大きさの空洞である。そし
て、本発明のポイントは、これらのレースウェイ３を包
含するドーナツ状領域１２の中で、且つ隣接する各レー
スウェイ３の間の中間に相当する位置に、その中心軸が
くるように、装入管を設置するものである。その結果、
装入されるコークスは、炉円周方向に、図２に示すよう
な粒径分布を持つ。つまり、羽口２直前の粒径は、その
周辺部より大きくなる。発明者は、この粒径分布の達成
を冷間模型での実験（実験条件は表１に示す）によって
確認できたのである。FIG. 1 is an outline of a coke packed bed type vertical refining furnace according to the present invention. It is a vertical sectional view in Figure 1.
As is clear from (a), the charging pipe 8 has a structure for supplying the massive coke 6 accumulated in the hopper 7 on the furnace into the furnace, and the powdery raw material of the metal oxide is supplied from the upper tuyeres 2. It is blown in and the oxygen-containing gas is blown in from the lower tuyeres. In addition, as shown in FIG. 1 (b) of the plan view, the raceways 3 in front of the lower tuyeres 2 ′ have almost the same size in the vertical direction during normal operation. It is a hollow of. The point of the present invention is that the center axis of the doughnut-shaped region 12 including these raceways 3 is located at a position corresponding to the middle between adjacent raceways 3. It is to install an immigration pipe. as a result,
The coke charged has a particle size distribution as shown in FIG. 2 in the circumferential direction of the furnace. That is, the particle diameter immediately before the tuyere 2 is larger than that of the peripheral portion. The inventor was able to confirm the achievement of this particle size distribution by an experiment in a cold model (experimental conditions are shown in Table 1).
【００１１】[0011]
【表１】 [Table 1]
【００１２】なお、該装入管の下端が、レースウエイよ
りはるか上方の炉上部になることは、説明を要しない。It should be noted that it is not necessary to explain that the lower end of the charging pipe is located above the raceway and above the furnace.
【００１３】[0013]
【実施例】生産能力１４０Ｔ／Ｄの本発明に係る竪型製
錬炉を製作し、粉状酸化鉄の原料から溶融鉄を製造し
た。その際の操業条件と操業結果を表２に示す。表２よ
り明らかなように、本発明の効果により、１４０Ｔ／Ｄ
の生産を行っても、燃料比１１２０ｋｇ／ｔ−ｍｅｔａ
ｌで操業が可能であった。一方、従来の装入管の中心軸
を各羽口の形成するレースウェイのほぼ中心位置に一致
させて設置した竪型製錬炉での結果（表２比較例）と比
較すると、燃料比で５０ｋｇ／ｔ−ｍｅｔａｌの低減が
あったことになる。Example A vertical smelting furnace according to the present invention having a production capacity of 140 T / D was manufactured, and molten iron was manufactured from a raw material of powdered iron oxide. Table 2 shows the operating conditions and the operating results at that time. As is clear from Table 2, due to the effect of the present invention, 140 T / D
Fuel ratio of 1120kg / t-meta
It was possible to operate at 1 l. On the other hand, when compared with the result (vertical example in Table 2) of the vertical smelting furnace in which the central axis of the conventional charging pipe is set to be substantially aligned with the central position of the raceway formed by each tuyere, the fuel ratio is There is a reduction of 50 kg / t-metal.
【００１４】[0014]
【表２】 [Table 2]
【００１５】[0015]
【発明の効果】以上述べたように、本発明では、炉下部
円周方向に複数本の送風用羽口を上下２段配設し、その
上下２段の羽口の内、上部の羽口より粉状の金属酸化
物、及びスラグ成分の調整用の造滓剤を炉内のコークス
充填層に吹込む竪型製錬炉において、コークス装入管の
配置を変える改造をしただけで、炉内で高温ガスと溶融
物の適正な接触を保つことができるようになり、操業に
おける燃料比の著しい低減が可能となった。As described above, according to the present invention, a plurality of air blower tuyeres are arranged in the upper and lower two stages in the circumferential direction of the lower part of the furnace. In a vertical smelting furnace in which a more powdery metal oxide and a slag-forming agent for adjusting the slag component are blown into the coke packed bed in the furnace, the furnace is simply modified by changing the arrangement of the coke charging pipes. It became possible to maintain proper contact between the hot gas and the melt inside, and it became possible to significantly reduce the fuel ratio during operation.
【図１】本発明に係るコークス充填層方式の竪型製錬炉
の概要を示す図であり、（ａ）は縦断面図、（ｂ）は平
面図である。FIG. 1 is a diagram showing an outline of a vertical coke packed bed type vertical smelting furnace according to the present invention, in which (a) is a longitudinal sectional view and (b) is a plan view.
【図２】冷間模型における本発明実施時の円周方向コー
クス粒径分布である。FIG. 2 is a circumferential coke grain size distribution when the present invention is carried out in a cold model.
【図３】従来の竪型製錬炉の概要を示す縦断面図であ
る。FIG. 3 is a vertical sectional view showing an outline of a conventional vertical smelting furnace.
【図４】同一出願人の特願平４−７１７６４号で出願中
の竪型製錬炉の概要図であり、（ａ）は縦断面図、
（ｂ）は平面図である。FIG. 4 is a schematic view of a vertical smelting furnace applied for in Japanese Patent Application No. 4-71764 of the same applicant, in which (a) is a vertical sectional view,
(B) is a plan view.
【図５】図４の装置で得た炉内円周方向でのコークスの
粒径分布である。FIG. 5 is a particle size distribution of coke in the furnace circumferential direction obtained by the apparatus of FIG.
１ コークス充填層 ２、２’ 上段羽口、下段羽口 ３ レースウェイ ４ ガス流 ５ ６ コークス ７ コークス供給ホッパ ８ 装入管 １２ レースウェイを包含するドーナツ状領域 １３ シャフト部 1 coke packed bed 2, 2'upper and lower tuyeres 3 raceway 4 gas flow 5 6 coke 7 coke supply hopper 8 charging pipe 12 donut-shaped region including raceway 13 shaft part
Claims (1)
してコークスを供給して形成されたコークス充填層に、
炉下部円周方向で上下２段に設けた複数本の送風用羽口
のうち、上段羽口より粉状の金属酸化物、及びスラグ成
分調整用の造滓剤を、下段羽口より酸素含有ガスを吹込
み、該金属酸化物を溶融、還元するコークス充填層方式
の竪型製錬炉において、 上記コークス装入管を、その中心軸が炉円周方向で隣り
合う送風羽口の直前に形成されるレースウェイ間の中間
位置になるように設けたことを特徴とするコークス充填
層方式の竪型製錬炉。1. A coke packed bed formed by supplying coke from a hopper above a furnace through a plurality of charging pipes,
Out of a plurality of blast tuyeres arranged in the upper and lower two stages in the circumferential direction of the lower part of the furnace, a powdered metal oxide from the upper tuyere and a slag-forming agent for adjusting the slag component, and oxygen from the lower tuyere In a vertical smelting furnace of a coke packed bed system in which a gas is blown to melt and reduce the metal oxide, the coke charging pipe is placed just before the blast tuyere whose central axis is adjacent in the furnace circumferential direction. A coke packed bed type vertical smelting furnace which is provided at an intermediate position between raceways to be formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP77594A JPH07197114A (en) | 1994-01-10 | 1994-01-10 | Coke packing layer type vertical smelting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP77594A JPH07197114A (en) | 1994-01-10 | 1994-01-10 | Coke packing layer type vertical smelting furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07197114A true JPH07197114A (en) | 1995-08-01 |
Family
ID=11483081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP77594A Withdrawn JPH07197114A (en) | 1994-01-10 | 1994-01-10 | Coke packing layer type vertical smelting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07197114A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824500A (en) * | 2010-05-18 | 2010-09-08 | 王志江 | Novel melting reduction iron-making furnace and smelting method thereof |
| CN102234698A (en) * | 2010-05-06 | 2011-11-09 | 丁公权 | Novel energy-saving and environment-friendly technology for making iron and making iron alloy by using lamp-shaped furnace |
| JP2012001778A (en) * | 2010-06-18 | 2012-01-05 | Jfe Steel Corp | Method for operating melting reduction furnace |
-
1994
- 1994-01-10 JP JP77594A patent/JPH07197114A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234698A (en) * | 2010-05-06 | 2011-11-09 | 丁公权 | Novel energy-saving and environment-friendly technology for making iron and making iron alloy by using lamp-shaped furnace |
| CN101824500A (en) * | 2010-05-18 | 2010-09-08 | 王志江 | Novel melting reduction iron-making furnace and smelting method thereof |
| JP2012001778A (en) * | 2010-06-18 | 2012-01-05 | Jfe Steel Corp | Method for operating melting reduction furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010403 |