JP3403093B2 - Method and equipment for producing reduced iron - Google Patents
Method and equipment for producing reduced ironInfo
- Publication number
- JP3403093B2 JP3403093B2 JP30016798A JP30016798A JP3403093B2 JP 3403093 B2 JP3403093 B2 JP 3403093B2 JP 30016798 A JP30016798 A JP 30016798A JP 30016798 A JP30016798 A JP 30016798A JP 3403093 B2 JP3403093 B2 JP 3403093B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- reduced iron
- gas
- iron
- produced
- 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 - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、還元鉄の製造方法
および製造設備に関し、特に、鉄鉱石の回転床式直接還
元炉に密閉式電気製銑炉を付設する技術に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing reduced iron and a manufacturing facility, and more particularly to a technology for attaching a closed electric pig iron furnace to a rotary bed type direct reduction furnace for iron ore.
【０００２】[0002]
【従来の技術】鉄鉱石の回転床式直接還元炉は、粉状の
鉄鉱石を還元剤としての石炭等の炭素質粉体と混合して
得た原料ペレットを高温に加熱して短時間で還元する設
備であり、以下の（１）〜（３）のような多くの利点を
有している。2. Description of the Related Art A rotary bed direct reduction furnace for iron ore heats raw material pellets obtained by mixing powdered iron ore with carbonaceous powder such as coal as a reducing agent to a high temperature, and in a short time. It is a facility for reduction, and has many advantages such as the following (1) to (3).
【０００３】すなわち、（１）還元剤として安価な石炭
を利用できる。（２）原料ペレットを予め焼成する必要
がないので、熱経済上有利である。（３）反応に預かる
物質（鉄鉱石粉および炭素質材料粉）が互いに接近して
存在し、かつ微粉であるために、還元反応速度が大とな
り還元が短時間（約１０分）で完結する。したがって、
回転床式直接還元炉の設備はシンプルでコンパクトにで
きるため、設備費が安くなる等の利点を有している。That is, (1) inexpensive coal can be used as a reducing agent. (2) It is advantageous in terms of heat economy because it is not necessary to fire the raw material pellets in advance. (3) Since the substances (iron ore powder and carbonaceous material powder) entrusted to the reaction exist close to each other and are fine powders, the reduction reaction rate is high and the reduction is completed in a short time (about 10 minutes). Therefore,
Since the equipment of the rotary bed type direct reduction furnace can be simple and compact, it has an advantage that the equipment cost is low.
【０００４】図５および図６を参照して、回転床式直接
還元炉についてより詳細に説明する。先ず、図５に示す
ように、符号１は回転床式直接還元炉（以下、還元炉と
称す）、符号２２は還元炉１の側壁等に備えられたバー
ナー、符号１３は原料ペレットを運搬するための運搬コ
ンベア、符号２は還元炉１の回転炉床２７上に均一に原
料ペレットを層状に均一に装入するための例えば往復動
式のコンベア、符号２４は還元されたペレット（還元鉄
ペレット）を還元炉１外へ排出するための、例えばスク
リュー式の還元鉄ペレット排出機、符号４は排出された
還元鉄ペレットを一時的に格納するためのコンテナー、
符号５は還元炉１内の燃焼ガスを排出するための排ガス
ダクトである。The rotary bed type direct reduction furnace will be described in more detail with reference to FIGS. 5 and 6. First, as shown in FIG. 5, reference numeral 1 is a rotary bed type direct reduction furnace (hereinafter, referred to as a reduction furnace), reference numeral 22 is a burner provided on a side wall of the reduction furnace 1, and reference numeral 13 is for carrying raw material pellets. A transport conveyor for carrying out the above, reference numeral 2 is, for example, a reciprocating conveyor for uniformly loading the raw material pellets in a layered manner on the rotary hearth 27 of the reducing furnace 1, and reference numeral 24 is a reduced pellet (reduced iron pellet ) Is discharged to the outside of the reduction furnace 1, for example, a screw type reduced iron pellet discharging machine, reference numeral 4 is a container for temporarily storing the discharged reduced iron pellets,
Reference numeral 5 is an exhaust gas duct for discharging the combustion gas in the reduction furnace 1.
【０００５】酸化鉄粉体としての鉄鉱石粉と炭素質粉体
としての石炭粉とを混合して製造された原料ペレット
は、運搬コンベア１３を介して往復動式コンベア２に供
給され、この往復動コンベア２により回転炉床２７上に
均一に１〜２層のペレット充填層として装入される。こ
のペレット充填層は、還元炉１内を矢印Ａ方向（図５中
では、時計回り方向）に一回転する間に、バーナー２２
により約１２００℃に加熱・還元され、さらに、スクリ
ュー式の還元鉄ペレット排出機２４により還元炉１外に
排出され、コンテナー４内に切り出される。一方、還元
炉１内の燃焼ガスは、原料ペレットを加熱した後、排ガ
スダクト５を通って還元炉１外に排出され、さらに、し
かるべき設備により清浄化された後、大気放出される。Raw material pellets produced by mixing iron ore powder as iron oxide powder and coal powder as carbonaceous powder are supplied to a reciprocating conveyor 2 via a conveying conveyor 13 and reciprocating. The conveyor 2 uniformly charges the rotary hearth 27 as one or two layers of pellet-packed layers. This pellet-packed bed is rotated in the direction of arrow A (clockwise in FIG. 5) in the reduction furnace 1 while the burner 22 is being rotated.
Is heated and reduced to about 1200 ° C., and further discharged to the outside of the reduction furnace 1 by a screw type reduced iron pellet discharging machine 24 and cut into the container 4. On the other hand, the combustion gas in the reducing furnace 1 heats the raw material pellets, is discharged to the outside of the reducing furnace 1 through the exhaust gas duct 5, is further cleaned by appropriate equipment, and is then released to the atmosphere.
【０００６】図６は、図５中においてバーナー２２から
時計回りに排ガスダクト５までの、原料ペレットの装入
部および還元鉄ペレットの排出部を詳細に示した断面図
である。図６において、符号３は還元鉄ペレット層２８
を炉外に切り出すための還元鉄排出室（排出部）であ
る。回転炉床２７は耐火物から構成されており、その下
部は鋼製の部材により構成され、回転駆動用の車輪３０
が付設されている。符号３１は車輪３０用のレールであ
る。回転炉床２７は、図６中で左から右に移動するよう
に回転する。符号２２は、還元炉１の固定壁に据え付け
てある原料ペレット加熱用バーナーであり、このバーナ
ー２２には、送気管２３より燃焼用空気が供給される。
符号３４は燃焼フレーム、符号２５は高温の還元鉄ペレ
ット層２８が焼き付きを生じないための冷却装置で、間
接的に還元鉄ペレット層２８を冷却する装置である。符
号２６は、還元鉄ペレット排出部３（排出室）と原料ペ
レット１００を還元炉１内に装入する原料ペレット装入
部１０１（装入室）とのガスの流通を抑制するためのガ
スリーク抑制用ダンパ（ガスシールダンパ）である。FIG. 6 is a sectional view showing in detail the charging section for raw material pellets and the discharging section for reduced iron pellets from the burner 22 to the exhaust gas duct 5 in the clockwise direction in FIG. In FIG. 6, reference numeral 3 is a reduced iron pellet layer 28.
This is a reduced iron discharge chamber (discharging part) for cutting the iron out of the furnace. The rotary hearth 27 is made of a refractory material, and its lower portion is made of a steel member.
Is attached. Reference numeral 31 is a rail for the wheel 30. The rotary hearth 27 rotates so as to move from left to right in FIG. Reference numeral 22 is a burner for heating the raw material pellets, which is installed on the fixed wall of the reduction furnace 1. The burner 22 is supplied with combustion air from an air supply pipe 23.
Reference numeral 34 is a combustion flame, and reference numeral 25 is a cooling device for preventing the high-temperature reduced iron pellet layer 28 from seizing, and is an apparatus for indirectly cooling the reduced iron pellet layer 28. Reference numeral 26 is a gas leak suppression for suppressing the flow of gas between the reduced iron pellet discharge part 3 (discharge chamber) and the raw material pellet charging part 101 (charge chamber) for charging the raw material pellets 100 into the reduction furnace 1. It is a damper for gas (gas seal damper).
【０００７】[0007]
【発明が解決しようとする課題】従来の回転床式還元炉
１は、図６に示したように、原料ペレット装入部１０１
と還元鉄ペレット排出部３とが円周上で接近しており、
かつ原料ペレット装入部１０１は排ガスダクト５に近
く、図中Ｓ部では排ガスダクト５に連結された排気ファ
ンのために大気圧に比し負圧となっている。また、原料
ペレット装入部１０１は、大気に通じているために、往
復動式コンベア２（装入コンベア）との間に隙間１０２
が形成され、この隙間を通って空気が矢印１０３，１０
４のように還元炉１内に流入してくる。As shown in FIG. 6, the conventional rotary bed type reduction furnace 1 has a raw material pellet charging section 101.
And the reduced iron pellet discharge part 3 are close to each other on the circumference,
In addition, the raw material pellet charging unit 101 is close to the exhaust gas duct 5, and at S portion in the figure, the exhaust fan connected to the exhaust gas duct 5 has a negative pressure compared to the atmospheric pressure. In addition, since the raw material pellet charging unit 101 communicates with the atmosphere, a gap 102 is formed between the raw material pellet charging unit 101 and the reciprocating conveyor 2 (charging conveyor).
Is formed, and air passes through these gaps and the arrows 103, 10
It flows into the reduction furnace 1 like No. 4.
【０００８】ところで、原料ペレット装入部１０１と還
元鉄ペレット排出室３の間にガスリーク抑制のためのダ
ンパー２６が付設されているとはいえ、シール性は完全
ではなく、リーク空気流１０３は還元鉄ペレット排出部
３内にも流入してくる。このため、以下の化学反応式
（１）および（２）が進行して、高温の還元鉄ペレット
は前記流入空気により再酸化されるという問題が生じ
る。
Ｆｅ（還元鉄）＋１／２Ｏ2→ＦｅＯ ……（１）
Ｆｅ＋３／４Ｏ2→１／２Ｆｅ2Ｏ3 ……（２）By the way, although the damper 26 for suppressing the gas leak is provided between the raw material pellet charging portion 101 and the reduced iron pellet discharge chamber 3, the sealing performance is not perfect and the leak air flow 103 is reduced. It also flows into the iron pellet discharging unit 3. For this reason, the following chemical reaction formulas (1) and (2) proceed, causing a problem that the hot reduced iron pellets are reoxidized by the inflowing air. Fe (reduced iron) + 1 / 2O 2 → FeO …… (1) Fe + 3 / 4O 2 → 1 / 2Fe 2 O 3 …… (2)
【０００９】また、時には、原料ペレット装入部１０１
および還元鉄ペレット排出部３の両室間の圧力バランス
が崩れ、バーナ２２の燃焼ガスが還元鉄ペレット排出部
３側に侵入してくる場合がある（図中１０５のガス
流）。この場合にも、バーナ２２の燃焼ガスは、ＣＯ2
ガス、Ｈ2Ｏガスを含有する酸化性ガスであるので、以
下の化学反応式（３）および（４）が進行して、還元鉄
ペレットの再酸化が生じ易いという問題点も生じる。そ
して、このような還元鉄（Ｆｅ）の再酸化反応は発熱反
応であり、場合によって再酸化した際にペレット同士が
融着してしまうこともある。
Ｆｅ＋ＣＯ2→ＦｅＯ＋ＣＯ ……（３）
Ｆｅ＋Ｈ2Ｏ→ＦｅＯ＋Ｈ2 ……（４）Also, sometimes, the raw material pellet charging section 101 is used.
Also, the pressure balance between the two chambers of the reduced iron pellet discharge part 3 may be lost, and the combustion gas of the burner 22 may enter the reduced iron pellet discharge part 3 side (gas flow 105 in the figure). Also in this case, the combustion gas of the burner 22 is CO 2
Since it is an oxidizing gas containing gas and H 2 O gas, the following chemical reaction formulas (3) and (4) proceed, and there is a problem that reoxidation of the reduced iron pellets easily occurs. Then, such a reoxidation reaction of reduced iron (Fe) is an exothermic reaction, and the pellets may be fused to each other when reoxidized in some cases. Fe + CO 2 → FeO + CO (3) Fe + H 2 O → FeO + H 2 (4)
【００１０】本発明は、上記従来技術の有する問題点に
鑑みてなされたものであり、回転床式直接還元炉で製造
された還元鉄の再酸化を防止する還元鉄の製造方法およ
び製造設備を提供することを目的としている。The present invention has been made in view of the above problems of the prior art, and provides a method and an apparatus for producing reduced iron for preventing reoxidation of the reduced iron produced in a rotary bed type direct reduction furnace. It is intended to be provided.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
の本発明の還元鉄の製造方法は、酸化鉄粉体と炭素質粉
体とを混合して製造した原料ペレットを回転床式直接還
元炉により還元し、該回転床式直接還元炉で製造された
還元鉄を密閉式電気製銑炉で溶解するとともに、該密閉
式電気製銑炉で副生されたＣＯガスを主体とする還元性
ガスを、前記回転床式直接還元炉の還元鉄ペレット排出
部近傍に流入せしめることを特徴とするものである。A method for producing reduced iron according to the present invention for achieving the above object is a rotary bed direct reduction of raw material pellets produced by mixing iron oxide powder and carbonaceous powder. Furnace, and the reduced iron produced in the rotary bed direct reduction furnace is melted in a closed electric pig iron furnace, and the reducing property is mainly CO gas by-produced in the closed electric pig iron furnace. It is characterized in that the gas is caused to flow into the vicinity of the reduced iron pellet discharge portion of the rotary bed type direct reduction furnace.
【００１２】また、本発明の還元鉄の製造設備は、酸化
鉄粉体と炭素質粉体とを混合して製造した原料ペレット
を還元するための回転床式直接還元炉と、該回転床式直
接還元炉で製造された還元鉄を溶解するための密閉式電
気製銑炉と、該密閉式電気製銑炉で副生されたＣＯガス
を主体とする還元性ガスを、前記回転床式直接還元炉の
還元鉄ペレット排出部近傍に流入せしめるための還元性
ガス流入手段と、を備えていることを特徴とするもので
ある。ここで、前記還元性ガス流入手段は、前記密閉式
電気製銑炉で副生された前記還元性ガスを収集するため
のガスホルダーと、前記ガスホルダーにパイプラインを
介して接続されかつ前記回転床式直接還元炉の前記還元
鉄ペレット排出部直前の炉壁を貫通するように配置され
たノルズと、を備えているものとすることができる。The facility for producing reduced iron of the present invention comprises a rotary bed type direct reduction furnace for reducing raw material pellets produced by mixing iron oxide powder and carbonaceous powder, and the rotary bed type direct reduction furnace. A closed-type electric pig iron furnace for melting reduced iron produced in a direct reduction furnace, and a reducing gas mainly containing CO gas by-produced in the closed-type electric pig iron furnace, Reducing gas inflow means for injecting the reducing gas into the vicinity of the reduced iron pellet discharge portion of the reducing furnace. Here, the reducing gas inflow means is connected to a gas holder for collecting the reducing gas by-produced in the closed electric pig iron furnace, a pipeline to the gas holder, and the rotation. And a Nords arranged so as to penetrate through the furnace wall immediately before the reduced iron pellet discharge part of the floor-type direct reduction furnace.
【００１３】ここで、本発明の作用について詳述する。
回転床式直接還元炉により製造される還元鉄の特性とし
て、石炭を還元剤として用いるために硫黄含有率が比
較的大きい、未還元のＦｅＯ分を含有していること、
ＳｉＯ2等の脈石分が比較的多いこと、等がある。Here, the operation of the present invention will be described in detail.
As a characteristic of the reduced iron produced by the rotary bed type direct reduction furnace, the content of unreduced FeO, which has a relatively large sulfur content because coal is used as a reducing agent,
There is a relatively large amount of gangue such as SiO 2 .
【００１４】しかして、本発明者等は、このような特性
を有する還元鉄を溶解し、鋼を溶製する場合の溶解炉と
しては、溶解炉の内部が還元性雰囲気に維持できる構造
を持ち、かつ銑鉄が溶製できて炉内の溶融物温度（約１
５００℃程度）が低い状態で操業できる密閉式電気製銑
炉（別名：サブマージドアーク炉）を利用するのが適切
であることを見出した。The inventors of the present invention, however, have a structure in which the inside of the melting furnace can be maintained in a reducing atmosphere as a melting furnace for melting reduced iron having such characteristics and melting steel. , And pig iron can be melted, the temperature of the melt in the furnace (about 1
It has been found that it is suitable to use a closed electric pig iron furnace (also known as a submerged arc furnace) that can operate in a low temperature (about 500 ° C.).
【００１５】さらに、前述のように還元鉄中に残留する
未還元のＦｅＯは炉内に存在するＣにより還元され、金
属鉄に転換されるとともに、副生成物としてＣＯガスを
生成する。このＣＯガスの生成量は、一般的な還元鉄の
金属比率の場合、還元鉄１トン当たり３０〜４０Ｎｍ3
にもなる。そこで、本発明者等は、回転床式直接還元炉
により製造される還元鉄の溶解には密閉式電気製銑炉が
適することを見出すとともに、この密閉式電気製銑炉で
副生されたＣＯガスを回転床式直接還元炉の還元鉄ペレ
ット排出部に導入することにより、以下のように、還元
鉄ペレットの再酸化を効率的に防止できることを見出し
た。Further, as described above, the unreduced FeO remaining in the reduced iron is reduced by C existing in the furnace and converted into metallic iron, and at the same time CO gas is produced as a by-product. The production amount of this CO gas is 30 to 40 Nm 3 per ton of reduced iron in the case of a general reduced iron metal ratio.
It also becomes. Therefore, the present inventors have found that a closed electric pig iron furnace is suitable for melting reduced iron produced by a rotary bed type direct reduction furnace, and the CO produced as a by-product in the closed electric pig iron furnace. It was found that the reoxidation of the reduced iron pellets can be effectively prevented by introducing the gas into the reduced iron pellet discharge part of the rotary bed type direct reduction furnace as follows.
【００１６】すなわち、回転床式直接還元炉で生産され
た還元鉄の溶解するために適切に選定された密閉式電気
製銑炉から副生する還元力の強いＣＯガスを、酸化性ガ
スと接触し易い、回転床式直接還元炉の還元鉄ペレット
排出部に導入することにより、この付近の酸化性ガス
（Ｏ2、ＣＯ2およびＨ2Ｏガス）の分圧を下げることに
よって、高温還元鉄ペレットの再酸化を抑制するもので
ある。また、導入されたＣＯガスは還元炉本体内で燃料
としても利用することができるので、バーナー燃料の節
約を図ることができる。That is, a highly reducing CO gas produced as a by-product from a closed electric ironmaking furnace properly selected for melting reduced iron produced in a rotary bed type direct reduction furnace is contacted with an oxidizing gas. By introducing it into the reduced iron pellet discharge part of the rotary bed type direct reduction furnace, the partial pressure of the oxidizing gas (O 2 , CO 2 and H 2 O gas) in this vicinity is lowered, so that the high temperature reduced iron is reduced. It suppresses reoxidation of pellets. Further, since the introduced CO gas can be used as fuel in the reduction furnace main body, burner fuel can be saved.
【００１７】[0017]
【発明の実施の形態】次に、本発明の一実施形態につい
て図面を参照して説明する。図１は本発明に係わる還元
鉄（ペレット）の製造設備の一実施形態の全体概要を示
す図、図２は図１に示した回転床式直接還元炉の還元鉄
ペレット排出部近傍の構造を示す断面図である。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an overall outline of an embodiment of a facility for producing reduced iron (pellets) according to the present invention, and FIG. 2 shows a structure in the vicinity of the reduced iron pellet discharge part of the rotary bed type direct reduction furnace shown in FIG. It is sectional drawing shown.
【００１８】先ず、図１に示すように、符号１ａは回転
床式直接還元炉１の炉本体で、図３に示したドーナツ状
の円形炉を平面状に展開したものである。符号２は原料
ペレットの装入部（往復動式のコンベア）、符号３は還
元鉄ペレット層２８を還元炉１外へ排出する場所であり
還元鉄ペレット排出部（排出室）であり、符号４は排出
された還元鉄ペレット格納用のコンテナー、符号５は炉
内の燃焼ガスを排出するための排ガスダクトを示す。つ
まり、図中符号１〜５および符号１３は図３に示した回
転床式直接還元炉と同一のものを示し、かつ作用も同一
である。First, as shown in FIG. 1, reference numeral 1a is a furnace body of a rotary bed type direct reduction furnace 1, which is a donut-shaped circular furnace shown in FIG. Reference numeral 2 is a charging portion for the raw material pellets (reciprocating conveyor), reference numeral 3 is a place for discharging the reduced iron pellet layer 28 out of the reduction furnace 1 and a reduced iron pellet discharging portion (discharge chamber), and reference numeral 4 Is a container for storing the discharged reduced iron pellets, and reference numeral 5 is an exhaust gas duct for discharging the combustion gas in the furnace. That is, the reference numerals 1 to 5 and the reference numeral 13 in the figure show the same thing as the rotary bed type direct reduction furnace shown in FIG. 3, and the operation is also the same.
【００１９】しかして、符号１４は還元鉄溶解用の密閉
式電気製銑炉（別名：サブマージドアーク炉）であり、
回転床式直接還元炉１で製造された還元鉄ペレットを装
入したコンテナー４が、密閉式電気製銑炉１４の炉頂ホ
ッパー１６上に運搬されると、還元鉄ペレットは空気に
触れることなく炉頂ホッパー１６内に装入され、さら
に、炉内に通じたシュート１７により連続的に密閉式電
気製銑炉１４内に装入される。そして、この還元鉄ペレ
ットは電極１８による通電加熱により、順次溶解され
る。生成された溶湯は炭素を比較的多く含有した溶銑の
状態を呈することとなる。この溶銑は間欠的にタップホ
ールから排出されトリベ１５に受湯された後、脱硫黄お
よび脱炭素の処理を施されて所望の溶鋼となる。Reference numeral 14 is a closed electric pig iron furnace (also known as a submerged arc furnace) for melting reduced iron,
When the container 4 charged with the reduced iron pellets produced in the rotary bed type direct reduction furnace 1 is transported to the top hopper 16 of the closed electric ironmaking furnace 14, the reduced iron pellets do not come into contact with air. It is charged into the furnace top hopper 16 and is further continuously charged into the closed electric pig iron furnace 14 by the chute 17 which communicates with the furnace. Then, the reduced iron pellets are sequentially melted by heating the electrodes 18 with electricity. The produced molten metal exhibits a state of molten pig iron containing a relatively large amount of carbon. The hot metal is intermittently discharged from the tap hole and received by the trowel 15, and then subjected to desulfurization and decarbonization treatment to obtain a desired molten steel.
【００２０】ところで、上述のように、還元炉１から製
造される還元鉄中には未還元の酸化鉄（ＦｅＯ）が残留
しており、この酸化鉄が密閉式電気製銑炉１４内の強還
元雰囲気により還元されると、ＣＯガスが副生される。
このＣＯガスの発生量は上述のごとく、還元鉄１トン当
たり３０〜４０Ｎｍ3であり、この副生されたＣＯガス
を主体とする還元性ガスは排気管１９を介して炉外に排
出された後、洗浄され、一旦ガスホルダー２０内に貯蔵
される。そして、ガスホルダー２０内の還元性ガスは、
パイプライン２１により還元炉１の還元鉄ペレット排出
部３の近傍より還元炉１内に導入される。By the way, as described above, unreduced iron oxide (FeO) remains in the reduced iron produced from the reduction furnace 1, and this iron oxide is strong in the closed electric pig iron furnace 14. When reduced by the reducing atmosphere, CO gas is produced as a by-product.
As described above, the generated amount of CO gas is 30 to 40 Nm 3 per ton of reduced iron, and the reducing gas mainly containing the CO gas produced as a by-product was discharged to the outside of the furnace through the exhaust pipe 19. After that, it is washed and once stored in the gas holder 20. Then, the reducing gas in the gas holder 20 is
It is introduced into the reduction furnace 1 from the vicinity of the reduced iron pellet discharge part 3 of the reduction furnace 1 by the pipeline 21.
【００２１】この態様を図２を参照して、さらに詳しく
説明する。図２において、符号１，３，４，２２〜３１
は図４中のものと同一のものを示す。パイプライン２１
の先端部は二股に分岐されており、各分岐先端にはガス
流入用ノズル３２，３３がそれぞれ接続されている。各
ガス流入用ノズル３２，３３は、回転床式直接還元炉１
の還元鉄ペレット排出部３の直前の炉本体１ａを斜めに
貫通する、かつ冷却装置２５の両側に配置されている。
ガスホルダー２０はパイプライン２１ａを介して排気管
１９に接続されている。ガスホルダー２０で一旦貯留さ
れた還元性ガスはパイプライン２１を通って、ガス流入
用ノズル３２，３３より、還元炉１の還元鉄ペレット排
出部３近傍に導入される。符号３５および３６は、この
還元性ガスのガス流を示す。This aspect will be described in more detail with reference to FIG. In FIG. 2, reference numerals 1, 3, 4, 22 to 31
Indicates the same as that in FIG. Pipeline 21
Has a bifurcated end, and gas inflow nozzles 32 and 33 are connected to the respective bifurcated ends. Each of the gas inflow nozzles 32, 33 has a rotary bed direct reduction furnace 1
The furnace main body 1a immediately before the reduced iron pellet discharge part 3 is obliquely penetrated, and is arranged on both sides of the cooling device 25.
The gas holder 20 is connected to the exhaust pipe 19 via a pipeline 21a. The reducing gas once stored in the gas holder 20 passes through the pipeline 21 and is introduced from the gas inflow nozzles 32 and 33 to the vicinity of the reduced iron pellet discharge part 3 of the reduction furnace 1. Reference numerals 35 and 36 indicate the gas flow of the reducing gas.
【００２２】上記説明から明らかなように、ガスホルダ
ー２０は、密閉式電気製銑炉１４で副生されたＣＯガス
を主体とする還元性ガスを収集するための還元性ガス収
集手段であり、このガスホルダー２０、パイプライン２
１およびガス流入用ノズル３２，３３等により、密閉式
電気製銑炉１４で副生された還元性ガスを、回転床式直
接還元炉１の還元鉄ペレット排出部３に流入せしめるた
めの還元性ガス流入手段を構成している。なお、ガスホ
ルダー２０（還元性ガス収集手段）を設けずに、双方の
パイプライン２１ａ，２１を繋ぎ、前記収集を経ずに還
元性ガスを還元鉄ペレット排出部３に流入せしめてもよ
い。また、ガス流入用ノズルの個数は、２つに限らず、
単数や他の複数個としてもよい。As is apparent from the above description, the gas holder 20 is a reducing gas collecting means for collecting a reducing gas mainly containing CO gas by-produced in the closed electric pig iron furnace 14, This gas holder 20, pipeline 2
1 and the gas inflow nozzles 32, 33, etc., to reduce the reducing gas by-produced in the closed electric pig iron furnace 14 into the reduced iron pellet discharge part 3 of the rotary bed type direct reduction furnace 1 It constitutes a gas inflow means. It is also possible to connect the two pipelines 21a, 21 without providing the gas holder 20 (reducing gas collecting means) and allow the reducing gas to flow into the reduced iron pellet discharge part 3 without passing through the collection. Further, the number of gas inflow nozzles is not limited to two,
It may be singular or other plural.
【００２３】還元鉄ペレットを１時間当たりに約５０ト
ン製造する場合の操業例を挙げると、密閉式電気製銑炉
１４は、１時間当たり約２２００Ｎｍ3のＣＯガスが副
生し、このＣＯガスを主体とする還元性ガスを還元炉１
の還元鉄ペレット排出部３にガス流入用ノズル３２，３
３より同量ずつ流入せしめた。これにより、排出される
直前の還元鉄ペレット層２８に前記還元性ガスを吹き付
けるとともに、還元鉄ペレット排出部３付近の酸化性ガ
ス（Ｏ2、ＣＯ2およびＨ2Ｏガス）の分圧を下げて、高
温の還元鉄ペレットの再酸化を抑制することができる。
還元鉄ペレット用のコンテナ４ー内に排出された還元鉄
を取り出して、その金属比率を分析したところ、従来の
還元鉄の金属比率に比して、平均して約３％も高い金属
比率の還元鉄を得ることができた。To give an example of operation for producing about 50 tons of reduced iron pellets per hour, the closed electric iron-making furnace 14 produces about 2200 Nm 3 of CO gas per hour as a by-product. Reducing gas containing mainly reducing gas 1
Nozzle 32, 3 for gas inflow to the reduced iron pellet discharge part 3 of
From 3 the same amount was introduced. As a result, the reducing gas is sprayed onto the reduced iron pellet layer 28 immediately before being discharged, and the partial pressure of the oxidizing gas (O 2 , CO 2 and H 2 O gas) near the reduced iron pellet discharging part 3 is lowered. Thus, reoxidation of the high temperature reduced iron pellets can be suppressed.
When the reduced iron discharged into the container 4 for reduced iron pellets was taken out and the metal ratio was analyzed, it was found that the metal ratio was about 3% higher on average than the metal ratio of the conventional reduced iron. Reduced iron could be obtained.
【００２４】また、回転床式直接還元炉１内に導入され
たＣＯガスは燃料としても使うことができるので、バー
ナー燃料の節約にも寄与できる。具体的には、バーナー
２２（バーナー群の一部）に使用するガス燃料を約１０
％低減することができた。Further, since the CO gas introduced into the rotary bed type direct reduction furnace 1 can be used also as fuel, it can contribute to the saving of burner fuel. Specifically, the gas fuel used for the burner 22 (a part of the burner group) is about 10
% Could be reduced.
【００２５】次に、本発明の還元鉄（ペレット）の製造
設備の他の実施形態について説明する。図３に示すよう
に、本実施形態では、冷却装置２５の両側のガス流入用
ノズル３２，３３（図２参照）を廃止し、その代わり
に、還元鉄ペレット排出部３を形成する炉本体３ａ（天
壁）に、ガス流入用ノズル４０を斜めに貫通しかつ還元
鉄ペレット排出機２４の上方に位置するように設け、さ
らに、このガス流入用ノズル４０を、パイプライン２１
を介して、密閉式電気製銑炉１４にて副生されたＣＯガ
スを主体とする還元性ガスのガスホルダー２０に接続し
たものである。Next, another embodiment of the reduced iron (pellet) manufacturing equipment of the present invention will be described. As shown in FIG. 3, in the present embodiment, the gas inflow nozzles 32 and 33 (see FIG. 2) on both sides of the cooling device 25 are eliminated, and instead, the furnace body 3a forming the reduced iron pellet discharge part 3 is formed. On the (top wall), the gas inflow nozzle 40 is provided so as to obliquely penetrate and is located above the reduced iron pellet discharger 24. Further, the gas inflow nozzle 40 is provided in the pipeline 21.
It is connected to a gas holder 20 of a reducing gas mainly composed of CO gas by-produced in the closed electric pig iron furnace 14 via.
【００２６】このような構成に基づき、ガス流入用ノズ
ル４０より還元性ガスのガス流４１を還元鉄ペレット排
出部３内に流入せしめ、このガス流４１を、スクリュー
式の回転する還元鉄ペレット排出機２４のスクリュー表
面に、その回転の接線方向とほぼ平行に当て、すなわ
ち、ガス流４１をスクリュー表面になめるように当て
る。したがって、スクリュー表面は、常温に近いガス流
４１により均一に冷却されて良好な冷却効果を受けるの
で、スクリューの摩耗速度が減少し、還元鉄ペレット排
出機２４の寿命が従来よりも約２０％以上も延びること
が確認された。また、前記の実施形態でも記したよう
に、コンテナー４に排出された還元鉄ペレットを取り出
してその金属比率を分析したところ、従来方法と比較し
て平均して約２％高い金属比率の還元鉄ペレットを得る
ことができた。また、バーナー２２（バーナー郡の一
部）に使用するガス燃料を従来と比較して約８％低減す
ることができた。Based on such a configuration, a gas flow 41 of a reducing gas is caused to flow into the reduced iron pellet discharge part 3 from the gas inflow nozzle 40, and this gas flow 41 is discharged by a screw type rotating reduced iron pellet. The screw surface of the machine 24 is applied almost parallel to the tangential direction of its rotation, ie the gas stream 41 is applied so that it blunts the screw surface. Therefore, the screw surface is uniformly cooled by the gas flow 41 close to room temperature and receives a good cooling effect, so that the wear rate of the screw is reduced and the life of the reduced iron pellet discharger 24 is about 20% or more than that of the conventional one. It was confirmed that it would be extended. Further, as described in the above embodiment, when the reduced iron pellets discharged into the container 4 were taken out and the metal ratio thereof was analyzed, it was found that the reduced iron having a metal ratio higher by about 2% on average as compared with the conventional method. A pellet could be obtained. Further, the gas fuel used for the burner 22 (a part of Burner County) could be reduced by about 8% as compared with the conventional one.
【００２７】本発明の還元鉄の製造設備のさらに他の実
施形態を図４に示す。この実施形態では、図２における
一方のガス流入用ノズル３３を廃止し、その代わりに、
図３と同様なガス流入用ノズル４０を備え、２つのガス
流入用ノズル３２，４０を枝分かれ形態のパイプライン
２１を介して、還元性ガスのガスホルダー２０に接続し
たものである。このように２つのガス流入用ノズル３
２，４０を併用する場合、毎時発生する約２２００Ｎｍ
3の還元性ガスをガス流入用ノズル３２より約３０％、
また、ガス流入用ノズル４０より約７０％をそれぞれ噴
出せしめ、ガス流３５および４１を形成せしめて、操業
した。その結果、還元鉄ペレット排出機２４の寿命が従
来よりも約１５％以上も延びることが確認され、また、
還元鉄ペレットの金属比率も平均して従来よりも約２．
５％高いことが確認された。さらに、バーナー２２（バ
ーナ郡の一部）に使用するガス燃料を従来と比較して約
９％低減することができた。FIG. 4 shows still another embodiment of the facility for producing reduced iron of the present invention. In this embodiment, one of the gas inflow nozzles 33 in FIG. 2 is eliminated, and instead,
A gas inflow nozzle 40 similar to that shown in FIG. 3 is provided, and two gas inflow nozzles 32, 40 are connected to a reducing gas holder 20 via a branched pipeline 21. In this way, the two gas inflow nozzles 3
Approximately 2200 Nm generated every hour when 2, 40 is used together
About 30% of the reducing gas of 3 from the gas inflow nozzle 32,
In addition, about 70% of the gas was injected from the gas inflow nozzle 40 to form the gas streams 35 and 41, and the operation was performed. As a result, it was confirmed that the life of the reduced iron pellet discharger 24 is extended by about 15% or more as compared with the conventional one.
The metal ratio of reduced iron pellets is about 2.
It was confirmed to be 5% higher. Furthermore, the gas fuel used for the burner 22 (part of Burner County) could be reduced by about 9% compared to the conventional one.
【００２８】[0028]
【発明の効果】本発明は、以上説明したとおりに構成さ
れているので、以下に記載するような効果を奏する。請
求項１記載の還元鉄の製造方法は、酸化鉄粉体と炭素質
粉体とを混合して製造した原料ペレットを回転床式直接
還元炉により還元し、該回転床式直接還元炉で製造され
た還元鉄を密閉式電気製銑炉で溶解するとともに、該密
閉式電気製銑炉で副生されたＣＯガスを主体とする還元
性ガスを、前記回転床式直接還元炉の還元鉄ペレット排
出部近傍に流入せしめたので、還元鉄ペレットの再酸化
を抑制することができる。また、発熱反応である再酸化
反応の進行を阻止できるので、ペレット同士が融着して
しまうこともない。さらに、ＣＯガスをバーナ燃料とし
ても利用できるので、バーナ燃料の節減を図ることがで
きる。Since the present invention is configured as described above, it has the following effects. The method for producing reduced iron according to claim 1, wherein raw material pellets produced by mixing iron oxide powder and carbonaceous powder are reduced in a rotary bed direct reduction furnace and produced in the rotary bed direct reduction furnace. The reduced iron thus produced is melted in a closed electric pig iron furnace, and a reducing gas mainly containing CO gas by-produced in the closed electric pig iron furnace is reduced iron pellets in the rotary bed direct reduction furnace. Since it was made to flow into the vicinity of the discharge part, reoxidation of the reduced iron pellets can be suppressed. Further, since the progress of the reoxidation reaction, which is an exothermic reaction, can be prevented, the pellets will not be fused together. Further, since CO gas can be used as the burner fuel, it is possible to save the burner fuel.
【００２９】請求項２記載の発明は、上記還元鉄の製造
方法を容易かつ確実に実施できる。請求項３記載の発明
は、還元性ガス流入手段として簡単な構成のものを採用
することにより、銑鉄の製造設備のコストが嵩まない。The invention according to claim 2 can easily and surely carry out the method for producing reduced iron. According to the third aspect of the invention, the cost of the pig iron manufacturing facility does not increase because the reducing gas inflow means has a simple structure.
【図１】 本発明に係わる還元鉄の製造設備の一実施形
態の全体概要を示す図である。FIG. 1 is a diagram showing an overall outline of an embodiment of a facility for producing reduced iron according to the present invention.
【図２】 図１に示した回転床式直接還元炉の還元鉄ペ
レット排出部近傍の構造を示す断面図である。FIG. 2 is a cross-sectional view showing a structure in the vicinity of a reduced iron pellet discharge part of the rotary bed type direct reduction furnace shown in FIG.
【図３】 本発明に係わる還元鉄の製造設備の他の実施
形態を示す、図２と同様に還元鉄ペレット排出部近傍の
構造を示す断面図である。FIG. 3 is a cross-sectional view showing another embodiment of the facility for producing reduced iron according to the present invention, showing the structure in the vicinity of the reduced iron pellet discharging part as in FIG. 2.
【図４】 本発明に係わる還元鉄の製造設備のさらに他
の実施形態を示す、図２と同様に還元鉄ペレット排出部
近傍の構造を示す断面図である。FIG. 4 is a sectional view showing a structure in the vicinity of a reduced iron pellet discharging portion, similar to FIG. 2, showing still another embodiment of the reduced iron manufacturing facility according to the present invention.
【図５】 従来の回転式鉄鉱石直接還元炉の概要を示す
図である。FIG. 5 is a diagram showing an outline of a conventional rotary iron ore direct reduction furnace.
【図６】 従来の回転式鉄鉱石直接還元炉で特に本発明
と係わりの深い部分を示す図である。FIG. 6 is a diagram showing a part particularly related to the present invention in a conventional rotary iron ore direct reduction furnace.
１ 回転床式直接還元炉 １ａ 炉本体（炉壁） ２ 原料ペレット装入部（往復動式のコンベア） ３ 還元鉄ペレット排出部 ４ コンテナー １４ 密閉式電気製銑炉（サブマージドアーク炉） １９ 排気管（ガス排出管） ２０ ガスホルダー ２１，２１ａ パイプライン ２２ バーナー ２４ スクリュー式の還元鉄ペレット排出機 ２５ 冷却装置 ２６ ガスリーク抑制用ダンパ ２７ 回転炉床（耐火材） ２８ 還元鉄ペレット層 ３２，３３，４０ ガス流入用ノズル ３５，３６，４１ ガス流 1 Rotary bed direct reduction furnace 1a Furnace body (furnace wall) 2 Raw material pellet charging section (reciprocating conveyor) 3 Reduced iron pellet discharge part 4 containers 14 Closed electric pig iron furnace (submerged arc furnace) 19 Exhaust pipe (gas exhaust pipe) 20 gas holder 21,21a pipeline 22 burners 24 screw type reduced iron pellet discharging machine 25 cooling system 26 Damper for gas leak suppression 27 Rotating hearth (refractory material) 28 Reduced iron pellet layer Nozzle for gas inflow 35,36,41 gas flow
───────────────────────────────────────────────────── フロントページの続き (72)発明者 板野 重夫 広島県広島市西区観音新町一丁目20番24 号 菱明技研株式会社内 (56)参考文献 特開 平11−29806（ＪＰ，Ａ) 特開 平２−228411（ＪＰ，Ａ) 特開 平11−269521（ＪＰ，Ａ) 特開 昭52−91721（ＪＰ，Ａ) 特開 平９−217105（ＪＰ，Ａ) 特表2001−515138（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21B 13/08 C21B 11/08 C21B 11/10 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeo Itano 1-20-24 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Ryomei Giken Co., Ltd. (56) Reference Japanese Patent Laid-Open No. 11-29806 (JP, A) Kaihei 2-228411 (JP, A) JP 11-269521 (JP, A) JP 52-91721 (JP, A) JP 9-217105 (JP, A) JP 2001-515138 (JP , A) (58) Fields investigated (Int.Cl. 7 , DB name) C21B 13/08 C21B 11/08 C21B 11/10
Claims (3)
造した原料ペレットを回転床式直接還元炉により還元
し、該回転床式直接還元炉で製造された還元鉄を密閉式
電気製銑炉で溶解するとともに、該密閉式電気製銑炉で
副生されたＣＯガスを主体とする還元性ガスを、前記回
転床式直接還元炉の還元鉄ペレット排出部近傍に流入せ
しめることを特徴とする還元鉄の製造方法。1. A raw material pellet produced by mixing iron oxide powder and carbonaceous powder is reduced in a rotary bed direct reduction furnace, and the reduced iron produced in the rotary bed direct reduction furnace is closed type. Reducing gas, which is melted in an electric pig iron furnace and mainly contains CO gas produced as a by-product in the closed electric pig iron furnace, into the vicinity of the reduced iron pellet discharge part of the rotary bed type direct reduction furnace. A method for producing reduced iron, comprising:
造した原料ペレットを還元するための回転床式直接還元
炉と、該回転床式直接還元炉で製造された還元鉄を溶解
するための密閉式電気製銑炉と、該密閉式電気製銑炉で
副生されたＣＯガスを主体とする還元性ガスを、前記回
転床式直接還元炉の還元鉄ペレット排出部近傍に流入せ
しめるための還元性ガス流入手段と、を備えていること
を特徴とする還元鉄の製造設備。2. A rotary bed direct reduction furnace for reducing raw material pellets produced by mixing iron oxide powder and carbonaceous powder, and reduced iron produced in the rotary bed direct reduction furnace. A closed electric pig iron furnace for melting and a reducing gas mainly containing CO gas by-produced in the closed electric pig iron furnace are provided in the vicinity of the reduced iron pellet discharge part of the rotary bed direct reduction furnace. An apparatus for producing reduced iron, comprising: a reducing gas inflow means for causing inflow.
電気製銑炉で副生された前記還元性ガスを収集するため
のガスホルダーと、前記ガスホルダーにパイプラインを
介して接続されかつ前記回転床式直接還元炉の前記還元
鉄ペレット排出部直前の炉壁を貫通するように配置され
たノルズと、を備えているものである請求項２記載の還
元鉄の製造設備。3. The reducing gas inflow means is connected to a gas holder for collecting the reducing gas by-produced in the closed electric pig iron furnace, and to the gas holder via a pipeline. 3. The reduced iron manufacturing facility according to claim 2, further comprising a nord arranged so as to penetrate through a furnace wall immediately before the reduced iron pellet discharging part of the rotary bed type direct reduction furnace.
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30016798A JP3403093B2 (en) | 1998-10-21 | 1998-10-21 | Method and equipment for producing reduced iron |
| TW088114480A TW461920B (en) | 1998-09-25 | 1999-08-24 | Method of producing reduced iron and production facilities therefor |
| US09/386,291 US6312501B1 (en) | 1998-09-25 | 1999-08-31 | Method of producing reduced iron and production facilities therefor |
| EP99306974A EP0989194A1 (en) | 1998-09-25 | 1999-09-02 | Method of producing reduced iron and production facilities therefor |
| EP03018218A EP1365036A1 (en) | 1998-09-25 | 1999-09-02 | Method of preparing carbonaceous iron oxide pellets with hydrocarbon-type binder |
| ARP990104650A AR021809A1 (en) | 1998-09-25 | 1999-09-16 | METHOD FOR PRODUCING REDUCED IRON AND FACILITIES FOR YOUR PRODUCTION |
| AU48784/99A AU722831B2 (en) | 1998-02-19 | 1999-09-17 | Method of producing reduced iron and production facilities therefor |
| KR1019990041200A KR100331211B1 (en) | 1998-09-25 | 1999-09-22 | Method of producing reduced iron and production facilities therefor |
| BR9904331A BR9904331A (en) | 1998-09-25 | 1999-09-23 | Reduced iron production process and production facilities |
| IDP990898A ID24548A (en) | 1998-09-25 | 1999-09-27 | METHOD OF MAKING IRON SEED AND PRODUCTION FACILITIES FOR THAT |
| US09/848,280 US6840981B2 (en) | 1998-09-25 | 2001-05-04 | Method of producing reduced iron and production facilities therefor |
| US09/912,498 US20020000687A1 (en) | 1998-09-25 | 2001-07-26 | Method of producing reduced iron and production facilities therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30016798A JP3403093B2 (en) | 1998-10-21 | 1998-10-21 | Method and equipment for producing reduced iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000129323A JP2000129323A (en) | 2000-05-09 |
| JP3403093B2 true JP3403093B2 (en) | 2003-05-06 |
Family
ID=17881563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30016798A Expired - Fee Related JP3403093B2 (en) | 1998-02-19 | 1998-10-21 | Method and equipment for producing reduced iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3403093B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001073020A (en) * | 1999-09-07 | 2001-03-21 | Mitsubishi Heavy Ind Ltd | Apparatus for producing reduced iron |
| JP5583940B2 (en) * | 2009-09-18 | 2014-09-03 | スタンレー電気株式会社 | Liquid crystal display device and method of manufacturing liquid crystal display device |
| AT508953B1 (en) | 2009-10-16 | 2011-07-15 | Siemens Vai Metals Tech Gmbh | METHOD AND DEVICE FOR CHARGING IN A FILLING UNIT |
| CN101967530B (en) * | 2010-10-29 | 2012-05-02 | 昆明钢铁集团有限责任公司 | Method for reducing iron by smelting reduction in electrometallurgy |
-
1998
- 1998-10-21 JP JP30016798A patent/JP3403093B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000129323A (en) | 2000-05-09 |
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