JPH0463216A - Smelting reduction device - Google Patents
Smelting reduction deviceInfo
- Publication number
- JPH0463216A JPH0463216A JP17363890A JP17363890A JPH0463216A JP H0463216 A JPH0463216 A JP H0463216A JP 17363890 A JP17363890 A JP 17363890A JP 17363890 A JP17363890 A JP 17363890A JP H0463216 A JPH0463216 A JP H0463216A
- Authority
- JP
- Japan
- Prior art keywords
- reduction furnace
- gas
- furnace
- smelting reduction
- preliminary
- 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.)
- Granted
Links
- 238000003723 Smelting Methods 0.000 title claims abstract description 56
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 9
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- 150000002739 metals Chemical class 0.000 claims abstract 2
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- 238000013022 venting Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 98
- 229910052742 iron Inorganic materials 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 66
- 239000006185 dispersion Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 238000007664 blowing Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
- Furnace Details (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
この発明は、金属酸化物鉱石を固体状態のまま予備的に
還元する予備還元炉と、さらにその鉱石を溶融して最終
還元する溶融還元炉とを備える溶融還元装置に関するも
のである。以下、詳細な説明の項では金属(金属酸化物
鉱石)として鉄(鉄鉱石)を例にとって述べる。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a preliminary reduction furnace that preliminarily reduces metal oxide ore in a solid state, and a smelting reduction furnace that further melts the ore for final reduction. The present invention relates to a melting reduction apparatus comprising: In the detailed explanation section below, iron (iron ore) will be described as an example of the metal (metal oxide ore).
[従来の技術]
溶融還元製鉄法とは、溶融還元炉を用い、鉄鉱石を溶融
状態で還元して銑鉄を得る方法である。[Prior Art] The smelting reduction ironmaking method is a method of reducing iron ore in a molten state using a smelting reduction furnace to obtain pig iron.
溶融還元炉は、反応が速やかで生産量を弾力的に調整で
きるなどの利点を有する反面、エネルギー利用率が低い
ので、これに予備還元炉を併設して溶融還元装置が構成
されることが多い。予備還元炉には、溶融還元炉で発生
するガス(Coを含み還元性のある高温ガス)が還元ガ
スとして導入され、ここで鉄鉱石が固体状態で予備的に
(予備還元鉄にまで)還元されたうえ、溶融還元炉に装
入される。予備還元炉としては、上記の還元ガスにより
鉄鉱石が流動化しながら還元させられる流動層式のもの
が多く採用される。流動層式なら、粉粒状の鉄鉱石をそ
のまま原料として使用できるうえ、それを連続的かつ均
一に処理できるからである。Although smelting reduction furnaces have the advantage of rapid reaction and the ability to flexibly adjust production volume, they have a low energy utilization rate, so smelting reduction equipment is often configured by adding a preliminary reduction furnace to the furnace. . The gas generated in the smelting reduction furnace (a high-temperature reducing gas containing Co) is introduced as a reducing gas into the pre-reduction furnace, where the iron ore is preliminarily reduced in a solid state (to pre-reduced iron). After that, it is charged into a smelting reduction furnace. As the pre-reduction furnace, a fluidized bed type is often adopted in which iron ore is reduced while being fluidized by the above-mentioned reducing gas. This is because the fluidized bed method allows granular iron ore to be used as it is as a raw material and can be processed continuously and uniformly.
溶融還元炉と流動層式の予備還元炉とは、従来、第4図
のように接続されている。すなわち、予備還元炉1の流
動層室1cから、下方にある溶融還元炉2の上部にかけ
て予備還元鉄(鉄鉱石)の供給管7が設けられるととも
に、溶融還元炉2のフード2eから予備還元炉1の風箱
(ガス導入室)1bまでガスダクト9が連続している。Conventionally, a smelting reduction furnace and a fluidized bed pre-reduction furnace are connected as shown in FIG. That is, a supply pipe 7 for pre-reduced iron (iron ore) is provided from the fluidized bed chamber 1c of the pre-reduction furnace 1 to the upper part of the smelting-reduction furnace 2 located below, and from the hood 2e of the smelting-reduction furnace 2 to the pre-reduction furnace. The gas duct 9 is continuous up to the wind box (gas introduction chamber) 1b.
予備還元炉1から溶融還元炉2までの予備還元鉄の通路
と、その逆向きに流れる還元ガスの通路とは、それぞれ
別々の管路なのである。特開平1−152225号公報
に記載の装置でも、この点は同様である。なお、詳細に
は、供給管7の途中に、上下間の圧力差保持機能のある
粉粒体切出し器(たとえばロータリバルブ) 8a・8
cとバッファタンク8bなどからなる予備還元鉄払出し
手段8が介装される必要がある。The path for the pre-reduced iron from the pre-reduction furnace 1 to the smelting reduction furnace 2 and the path for the reducing gas flowing in the opposite direction are separate pipes. This point is also the same in the device described in Japanese Patent Application Laid-Open No. 1-152225. In addition, in detail, in the middle of the supply pipe 7, there is a powder cutter (for example, a rotary valve) 8a, 8 that has a function of maintaining the pressure difference between the upper and lower sides.
A preliminary reduced iron dispensing means 8 consisting of a buffer tank 8b and a buffer tank 8b must be interposed.
[発明が解決しようとする課題]
第4図のような溶融還元装置は、溶融還元炉2への予備
還元鉄の供給量を制御しやすいという利点はあるが、下
記の不都合をともなう。[Problems to be Solved by the Invention] Although the smelting reduction apparatus as shown in FIG. 4 has the advantage of being easy to control the amount of pre-reduced iron supplied to the smelting reduction furnace 2, it has the following disadvantages.
イ)供給管7の上端が開口している予備還元炉1の流動
層室la内と、その下端が開口している溶融還元炉2の
内部とではかなりの圧力差がある(後者が高い)ので、
前者から後者へ予備還元鉄を送るために上述の払出し手
段8が不可欠である。b) There is a considerable pressure difference between the inside of the fluidized bed chamber la of the preliminary reduction furnace 1, where the upper end of the supply pipe 7 is open, and the inside of the smelting reduction furnace 2, where the lower end is open (the latter is higher) So,
The above-mentioned dispensing means 8 is essential in order to send the preliminary reduced iron from the former to the latter.
同手段8を設けることは、コスト的な不利は言うまでも
なく、溶融還元装置の全体高さが増すというデメリット
となる。Providing the means 8 has the disadvantage of increasing the overall height of the melting reduction apparatus, not to mention the cost disadvantage.
口)供給管7(および払出し手段8)を通過する間に、
予備還元鉄から系外(大気中)への放熱が起きるので、
その分、溶融還元装置としての熱効率が低い。) While passing through the supply pipe 7 (and dispensing means 8),
Heat is radiated from the preliminary reduced iron to the outside of the system (into the atmosphere), so
Accordingly, the thermal efficiency as a melting reduction device is low.
ハ)溶融還元炉2からガスとともに発生するダスト(鉄
粉など)が、ダクト9の内面に付着・堆積しやすい。こ
れは、ガスを保温してその還元能力を高(保つ目的でダ
クト9の内面に耐火物が張られているせいでもある。c) Dust (such as iron powder) generated together with the gas from the melting reduction furnace 2 tends to adhere and accumulate on the inner surface of the duct 9. This is partly because the inner surface of the duct 9 is lined with refractory material in order to keep the gas warm and its reducing ability high.
二)流動層室1cから分散板(ガスの整流板) laの
ノズルを通過して予備還元鉄が落下しないよう、従来、
多めの還元ガスを予備還元炉1に導入するのが常識的で
あるが、その場合にも多少の予備還元鉄は落下して風箱
1b内にたまる。それらは、風箱1bの底部において高
温の還元ガスに長時間さらされることにより溶着し、極
めて除去しにくい堆積物となる。2) To prevent the pre-reduced iron from falling from the fluidized bed chamber 1c through the nozzle of the dispersion plate (gas rectifying plate) la,
It is common sense to introduce a large amount of reducing gas into the preliminary reduction furnace 1, but even in that case, some preliminary reduced iron falls and accumulates in the wind box 1b. They are welded by being exposed to the high temperature reducing gas at the bottom of the wind box 1b for a long time, and become deposits that are extremely difficult to remove.
本発明の目的は、上記イ)〜二)の不都合を解消する溶
融還元装置を提供することである。An object of the present invention is to provide a melting reduction apparatus that eliminates the above-mentioned disadvantages (a) to (2).
[課題を解決するための手段]
本発明の請求項1の溶融還元装置では、■予備還元炉の
風箱底部と溶融還元炉の上部とを、前者から後者への鉄
鉱石(予備還元鉄)の通路と後者から前者への還元ガス
の通路とを兼ねる管路によってつなぐとともに、■予備
還元炉の排ガス管に開度調整ダンパを設けている。[Means for Solving the Problems] In the smelting reduction apparatus according to claim 1 of the present invention, (1) the bottom of the wind box of the preliminary reduction furnace and the upper part of the smelting reduction furnace are connected to the iron ore (preliminary reduced iron) from the former to the latter; The passageway is connected by a pipe that also serves as a passageway for reducing gas from the latter to the former, and an opening adjustment damper is provided on the exhaust gas pipe of the preliminary reduction furnace.
また請求項2の溶融還元装置では、■予備還元炉の風箱
底部と溶融還元炉の上部とを、前者から後者への鉄鉱石
(予備還元鉄)の通路と後者から前者への還元ガスの通
路とを兼ねる管路によってつなぐとともに、■予備還元
炉の風箱もしくは溶融還元炉の上部に、開度調整ダンパ
を有するガス抜き管を接続している。In addition, in the smelting reduction apparatus of claim 2, (1) the bottom of the wind box of the preliminary reduction furnace and the top of the smelting reduction furnace are connected to a passage for iron ore (preliminary reduced iron) from the former to the latter and a passage for reducing gas from the latter to the former; They are connected by a pipe that also serves as a passage, and a gas vent pipe with an opening adjustment damper is connected to the wind box of the preliminary reduction furnace or the upper part of the smelting reduction furnace.
[作用コ
この発明の溶融還元装置では、予備還元炉において予備
還元鉄が風箱内に落下し、その底部から上記■の管路を
通って溶融還元炉まで予備還元鉄が供給されるとともに
、逆の向きに(後者から前者へ)同じ管路を経て還元ガ
スが導かれる。すなわち、予備還元炉で風箱内に落下し
た予備還元鉄は、上記の管路内を、還元ガスに接触しな
がらそのガスの流れとは逆の向きに重力落下して溶融還
元炉内に入る。溶融還元炉からの上記還元ガスは高温な
ので、この管路内で予備還元鉄は加熱されながら予備還
元を継続されることになる。また、溶融還元炉からガス
で運ばれて管路の内面などに付着したダストは、下方へ
向かう予備還元鉄によって取り除かれ、予備還元鉄とと
もに溶融還元炉内に落下する。[Function] In the smelting reduction apparatus of this invention, the pre-reduced iron falls into the wind box in the pre-reduction furnace, and the pre-reduced iron is supplied from the bottom of the box to the smelting-reduction furnace through the pipe line (2) above. Reducing gas is led in the opposite direction (from the latter to the former) through the same conduit. In other words, the pre-reduced iron that has fallen into the wind box in the pre-reduction furnace falls by gravity in the direction opposite to the flow of the gas while coming into contact with the reducing gas in the above-mentioned pipe and enters the smelting reduction furnace. . Since the reducing gas from the smelting reduction furnace has a high temperature, the pre-reduced iron continues to be pre-reduced while being heated in this conduit. Further, dust carried by gas from the smelting reduction furnace and attached to the inner surface of the pipe line is removed by the preliminary reduced iron moving downward, and falls into the smelting reduction furnace together with the preliminary reduced iron.
溶融還元炉への予備還元鉄の供給量は、上記■(請求項
1)または◎(請求項2)の開度調整ダンパの開度を適
当に設定することにより調整される。溶融還元炉へ供給
される予備還元鉄は、予備還元炉において流動層室から
風箱へ向けて落下したものであり、その量は、溶融還元
炉を出て予備還元炉の風箱を通り上の流動層室に向かう
還元ガスの量によって調整が可能だからである。すなわ
ち請求項1の場合は、■のダンパについて例えば開度を
増すと、予備還元炉内のガスの圧力が下がって体積が増
え、流動層内へのガスの実流j!(流速)が高まって予
備還元鉄の落下量(つまり供給量)が減少する。請求項
2の場合は、■のダンパにつき例えば開度を増すと、ガ
ス抜き管から外部に至るガスが増えて予備還元炉の流動
層室に流れるガスか減ることにより、予備還元鉄の落下
量(供給量)が増加する。The amount of pre-reduced iron supplied to the smelting reduction furnace is adjusted by appropriately setting the opening degree of the opening adjustment damper of the above (claim 1) or ◎ (claim 2). The pre-reduced iron supplied to the smelting reduction furnace is the one that falls from the fluidized bed chamber to the wind box in the pre-reduction furnace, and the amount of pre-reduced iron that leaves the smelter reduction furnace, passes through the wind box of the pre-reduction furnace and rises. This is because the amount of reducing gas flowing into the fluidized bed chamber can be adjusted. That is, in the case of claim 1, when the opening degree of the damper (2) is increased, the pressure of the gas in the pre-reduction furnace decreases, the volume increases, and the actual flow of gas into the fluidized bed j! (flow velocity) increases, and the amount of falling preliminary reduced iron (that is, the amount of supply) decreases. In the case of claim 2, for example, when the opening degree of the damper (■) is increased, the amount of gas flowing from the gas vent pipe to the outside increases, and the amount of gas flowing into the fluidized bed chamber of the pre-reducing furnace decreases, thereby reducing the amount of pre-reduced iron that falls. (supply amount) increases.
このように、予備還元炉の流動層室に至るガスの量を調
整することにより予備還元鉄を重力落下させて溶融還元
炉へ供給するため、溶融還元炉への予備還元鉄の払出し
手段は特別には必要ない。In this way, by adjusting the amount of gas that reaches the fluidized bed chamber of the pre-reduction furnace, the pre-reduced iron is allowed to fall by gravity and is supplied to the smelting reduction furnace. Therefore, the means for discharging the pre-reduced iron to the smelting reduction furnace is specially designed. It's not necessary.
[実施例]
第1図は、この発明の第一実施例としての溶融還元装置
につき概要断面を示す図面である。図中、符号1は鉄鉱
石の流動層式予備還元炉、符号2は溶融還元炉をさす。[Example] FIG. 1 is a schematic cross-sectional view of a melting reduction apparatus as a first example of the present invention. In the figure, reference numeral 1 indicates a fluidized bed preliminary reduction furnace for iron ore, and reference numeral 2 indicates a smelting reduction furnace.
予備還元炉1は、多数のノズルがあけられた分散板1a
を炉体内に備え、その下部に風箱1bが形成され、上部
に流動層室1cが形成されている。流動層室1cには、
粒状の鉄鉱石が投入管1dから投入される一方、風箱1
bから分散板1a(のノズル)を通して還元ガス(兼流
動化ガス)が導入され、鉄鉱石はここで流動化しながら
加熱・還元されて予備還元鉄となる。流動層室1cの上
部には排ガス管4が設けられており、これには、飛散し
た微粒の予備還元鉄を捕集するためのサイクロン6aか
介装され、それに切り出しバルブ6bおよび移送管6c
か接続されている。The preliminary reduction furnace 1 includes a dispersion plate 1a in which a large number of nozzles are drilled.
A wind box 1b is formed in the lower part of the furnace body, and a fluidized bed chamber 1c is formed in the upper part. In the fluidized bed chamber 1c,
While granular iron ore is introduced from the input pipe 1d, the wind box 1
Reducing gas (also fluidizing gas) is introduced from b through (the nozzle of) the dispersion plate 1a, and the iron ore is fluidized while being heated and reduced to become pre-reduced iron. An exhaust gas pipe 4 is provided in the upper part of the fluidized bed chamber 1c, and a cyclone 6a for collecting scattered fine particles of pre-reduced iron is interposed therein, and a cut-out valve 6b and a transfer pipe 6c are connected to the exhaust gas pipe 4.
or connected.
溶融還元炉2は、鉄浴(溶鉄) 2a中に、予備還元鉄
のほか、還元剤である石炭やその燃焼剤である酸素など
を装入することにより、溶融銑鉄を得るものである。図
中、符号2bは石炭および副原料の投入管、2cは酸素
吹込み用ランス、2dは、前記サイクロン6aで捕集し
た微粒予備還元鉄などを鉄浴撹拌ガスとともに装入する
吹込み管である。運転中、鉄浴2aからはCO(−酸化
炭素)を多量に含んで還元性のある高温のガスが発生す
るので、これを密閉式のフード2eで集め、還元ガスと
して予備還元炉1へ送っている。符号2fは、溶融還元
炉2を傾動可能に支える支持手段の一部である。The smelting reduction furnace 2 obtains molten pig iron by charging preliminary reduced iron, coal as a reducing agent, oxygen as a combustion agent, etc. into an iron bath (molten iron) 2a. In the figure, reference numeral 2b is a charging pipe for coal and auxiliary raw materials, 2c is a lance for oxygen blowing, and 2d is a blowing pipe into which fine particles of preliminary reduced iron collected by the cyclone 6a are charged together with the iron bath stirring gas. be. During operation, high-temperature reducing gas containing a large amount of CO (-carbon oxide) is generated from the iron bath 2a. This is collected in a closed hood 2e and sent to the preliminary reduction furnace 1 as a reducing gas. ing. Reference numeral 2f is a part of support means that supports the melting reduction furnace 2 in a tiltable manner.
この装置では、溶融還元炉2から予備還元炉1へのガス
の導入路と、予備還元炉lから溶融還元炉2への予備還
元鉄の供給路とを兼ねて、管路3により両炉1・2を接
続している。還元ガスの通路であるため、この管路3は
、溶融還元炉2のフード2eと予備還元炉lの風fib
とをつなくものとし、ガスの放熱を抑えるよう耐火物を
内張すした。In this device, a conduit 3 serves both as an introduction path for gas from the smelting reduction furnace 2 to the preliminary reduction furnace 1 and as a supply path for preliminary reduced iron from the preliminary reduction furnace 1 to the smelting reduction furnace 2.・2 is connected. Since this pipe line 3 is a passage for reducing gas, it is connected to the hood 2e of the melting reduction furnace 2 and the wind fib of the preliminary reduction furnace l.
It was lined with refractory material to suppress the heat radiation of the gas.
管路3は予備還元鉄の通路でもあるため、予備還元鉄か
風箱1b内に堆積せぬよう風箱1bの最下部中央に大き
く開口させるとともに、予備還元鉄か重力落下するに十
分な急傾斜をもたせた。また、予備還元炉1の分散板1
aについては、流動層室1c内の予備還元鉄がこれを通
過して風箱1bおよび管路3内へ落下するように、鉄鉱
石の粒径より大きめの径をもつストレートなノズルを設
けている。このようなノズルは、鉄鉱石が高温下で焼結
または溶着しやすいにも拘わらず、それによる閉塞が起
こりにくい点でも好都合である。Since the conduit 3 is also a passage for the pre-reduced iron, it should be opened wide at the center of the bottom of the wind box 1b to prevent the pre-reduced iron from accumulating in the wind box 1b, and should be opened sufficiently steeply so that the pre-reduced iron can fall by gravity. It was tilted. In addition, the dispersion plate 1 of the preliminary reduction furnace 1
Regarding a, a straight nozzle with a diameter larger than the particle size of the iron ore is provided so that the preliminary reduced iron in the fluidized bed chamber 1c passes through this and falls into the wind box 1b and the pipe line 3. There is. Such a nozzle is also advantageous in that although iron ore tends to sinter or weld at high temperatures, it is unlikely to be clogged by this.
分散板1aを下方へ通過する予備還元鉄の量、すなわち
風箱1b・管路3を経て溶融還元炉2へ供給される量は
、分散板1aを上方へ通過するガスの流速によって決ま
るが、その流速を調整する手段として本実施例では、予
備還元炉1からの排ガス管4に、開度調整可能なダンパ
5を介装している。The amount of pre-reduced iron that passes downward through the distribution plate 1a, that is, the amount that is supplied to the melting reduction furnace 2 via the wind box 1b and pipe line 3, is determined by the flow rate of the gas that passes upward through the distribution plate 1a. In this embodiment, as a means for adjusting the flow rate, a damper 5 whose opening degree can be adjusted is interposed in the exhaust gas pipe 4 from the preliminary reduction furnace 1.
ここで使用したダンパ5は、遠隔操作されるアクチュエ
ータ(図示せず)により弁体が開閉駆動されるもので、
その開度によって予備還元炉1内のガス圧力を変えられ
る。したがって、たとえばその開度を下げる(閉じぎみ
にする)と、圧力が上がってガスの体積が減り、分散板
1aを通るガス流速が下がるので、落下する予備還元鉄
の量を増やすことかできる。なお、この落下量の増減は
、たとえば、予備還元炉1で流動層室1cにおける流動
層の高さ(層高)を観察(もしくは自動検知)し、それ
に応じて設定すればよい。The damper 5 used here has a valve body that is driven to open and close by a remotely controlled actuator (not shown).
The gas pressure inside the preliminary reduction furnace 1 can be changed depending on the opening degree. Therefore, for example, if the opening degree is lowered (closed), the pressure increases and the volume of gas decreases, and the gas flow rate through the dispersion plate 1a decreases, so it is possible to increase the amount of pre-reduced iron that falls. Incidentally, the increase or decrease in the falling amount may be determined, for example, by observing (or automatically detecting) the height of the fluidized bed (bed height) in the fluidized bed chamber 1c in the preliminary reduction furnace 1, and setting it accordingly.
第2図は本発明の第二実施例を示す概要図である。この
溶融還元装置でも、予備還元鉄と還元ガスとの双方の通
路を兼ねた管路3によって予備還元炉1と溶融還元炉2
とをつないでいるが、−基の溶融還元炉2に対し、二基
の予備還元炉lを、二股に形成した管路3を用いて並列
に接続している。また、それぞれの予備還元炉lに、開
度調整ダンパ5を介して排ガス管4を連結している。FIG. 2 is a schematic diagram showing a second embodiment of the present invention. In this smelting reduction apparatus, the pre-reducing furnace 1 and the smelting-reducing furnace 2
However, two pre-reduction furnaces 1 are connected in parallel to the smelting reduction furnace 2 using a bifurcated pipe line 3. Further, an exhaust gas pipe 4 is connected to each preliminary reduction furnace 1 via an opening adjustment damper 5.
この実施例の装置では、溶融還元炉2への予備還元鉄の
供給量を、各予備還元炉1ごとに独立に設定することか
できる。したかつて例えば、一方の予備還元炉lからは
溶融還元炉2へ予備還元鉄を多く供給しながら、他方の
予備還元炉1ではその供給量をほとんどゼロにし、時間
をかけて還元の度合い(予備還元率)を高める、といっ
た運転も可能である。In the apparatus of this embodiment, the amount of preliminary reduced iron supplied to the smelting reduction furnace 2 can be set independently for each preliminary reduction furnace 1. For example, in the past, one pre-reducing furnace 1 supplied a large amount of pre-reduced iron to the smelting reduction furnace 2, while the other pre-reducing furnace 1 reduced its supply amount to almost zero, and over time the degree of reduction (pre-reduced iron) was reduced to zero. It is also possible to increase the return rate.
続く第3図の溶融還元装置は、本発明の第三実施例であ
り、予備還元炉と溶融還元炉、それに両者間の管路すな
わち予備還元鉄および還元ガスの兼用通路を、一つの炉
体である複合炉10のうちに形成したものである。The subsequent smelting reduction apparatus shown in FIG. 3 is a third embodiment of the present invention, in which a pre-reducing furnace, a smelting-reducing furnace, and a conduit between the two, that is, a dual-purpose passage for pre-reduced iron and reducing gas, are integrated into one furnace body. It was formed in a composite furnace 10.
すなわち、縦に長い筒状炉体を有する図示の複合炉10
において、上部に流動層式の予備還元炉部分11を設け
、下部には溶融還元炉部分12を設けた。That is, the illustrated combined furnace 10 having a vertically long cylindrical furnace body
A fluidized bed pre-reduction furnace section 11 was provided in the upper part, and a smelting reduction furnace section 12 was provided in the lower part.
予備還元炉部分11というのは、分散板11aをはさん
で上に流動層室11C,下に風箱11bを形成し、最上
部に鉄鉱石の投入管lidおよび排ガス管14を設けた
ものである。また溶融還元炉部分12については、底部
を鉄浴保持部12aとし、ここに、酸素や微粉原料の吹
込み管12cと、マッドガンやエアドリル等を用いて開
閉可能な出湯孔12gとを設けるとともに、側壁には石
炭等の投入管12bと、予備還元炉部分11へ送るガス
の温度調整(冷却)用窒素ガスの吹込み管12hとを接
続している。両炉部分11・12が直線状に上下につな
かっていることから、予備還元炉部分11の真下の空間
は、風箱11bであると同時に、分散板11aから落下
して溶融還元炉部分12に至る予備還元鉄と、溶融還元
炉部分12で発生して予備還元炉部分11に向かう還元
ガスとの双方が通る管路13でもある。The preliminary reduction furnace section 11 has a fluidized bed chamber 11C on the top and a wind box 11b on the bottom with a dispersion plate 11a in between, and an iron ore input pipe lid and an exhaust gas pipe 14 are provided at the top. be. In addition, regarding the melting reduction furnace section 12, the bottom part is an iron bath holding section 12a, and here is provided a blowing pipe 12c for oxygen and fine powder raw materials, and a tapping hole 12g that can be opened and closed using a mud gun, an air drill, etc. A charging pipe 12b for coal, etc., and a nitrogen gas blowing pipe 12h for temperature adjustment (cooling) of the gas sent to the preliminary reduction furnace section 11 are connected to the side wall. Since both furnace parts 11 and 12 are connected vertically in a straight line, the space directly below the preliminary reduction furnace part 11 is a wind box 11b, and at the same time, the space that falls from the dispersion plate 11a is connected to the smelting reduction furnace part 12. It is also a conduit 13 through which both the preliminary reduced iron leading to the smelting reduction furnace section 12 and the reducing gas generated in the smelting reduction furnace section 12 and heading toward the preliminary reduction furnace section 11 pass.
こうした複合炉lOに対し、予備還元炉部分11の排ガ
ス管14に開度調整ダンパ15を設けるとともに、風箱
11bすなわち溶融還元炉部分12の上部空間であり管
路13でもある部分の側壁に、開度調整ダンパ17を有
するガス抜き管16を連結している。これらはいずれも
、予備還元炉部分11から落下して溶融還元炉部分12
へ供給される予備還元鉄の量を調整する手段である。す
なわちダンパ15は、前記した実施例におけるダンパ5
と同じく炉内の圧力を変えることにより、分散板11a
を通るガス流速を変更して予備還元鉄の落下量を調整す
る。ガス抜き管16およびダンパ17は、溶融還元炉部
分12で発生したガスの一部を、予備還元炉部分11へ
送らず排ガス管■4の下流へバイパスさせることにより
、分散板11aを通るガスの流速、したかって予備還元
鉄の落下量を調整することかできる。In such a combined furnace IO, an opening adjustment damper 15 is provided on the exhaust gas pipe 14 of the preliminary reduction furnace section 11, and on the side wall of the wind box 11b, that is, the upper space of the smelting reduction furnace section 12, which is also the pipe line 13. A gas vent pipe 16 having an opening adjustment damper 17 is connected. All of these fall from the pre-reduction furnace section 11 and enter the smelting reduction furnace section 12.
This is a means to adjust the amount of preliminary reduced iron supplied to the That is, the damper 15 is the same as the damper 5 in the embodiment described above.
Similarly, by changing the pressure inside the furnace, the distribution plate 11a
Adjust the amount of pre-reduced iron falling by changing the gas flow rate through. The gas vent pipe 16 and the damper 17 bypass a part of the gas generated in the melting reduction furnace section 12 to the downstream of the exhaust gas pipe 4 without sending it to the preliminary reduction furnace section 11, thereby reducing the amount of gas passing through the distribution plate 11a. It is possible to adjust the flow rate and therefore the falling amount of pre-reduced iron.
予備還元鉄の落下量調整手段を上記のとおり二つ設けた
のは、二つのダンパ15・17を同時に開度調整するこ
とにより炉内のガス圧力と分散板11aを通るガス流速
とを別々に変更するなど、高い自由度のもとて予備還元
鉄の落下量調整を可能にするのが目的である。たとえば
、ダンパ15の開度を下げる(しぼる)とガス流速が下
がるとともにガス圧力が上昇するが、同時にダンパ17
の開度を適当に上げると、その圧力を元どおりの一定値
にすることができる。こういった点は、ガスの圧力が炉
内の冶金的反応に影響することからメリットとなる。こ
の例(第3図)に比べてダンパ15がない場合にも、あ
るいはダンパ15があってガス抜き管16とダンパ17
がない場合にも、予備還元鉄の落下量調整が可能なこと
は言うまでもない。The reason why two means for adjusting the fall amount of preliminary reduced iron are provided as described above is that by simultaneously adjusting the opening of the two dampers 15 and 17, the gas pressure in the furnace and the gas flow rate passing through the dispersion plate 11a can be adjusted separately. The purpose is to make it possible to adjust the falling amount of preliminary reduced iron with a high degree of freedom. For example, when the opening degree of the damper 15 is lowered (squeezed), the gas flow rate decreases and the gas pressure increases, but at the same time, the damper 17
By increasing the opening degree appropriately, the pressure can be returned to its original constant value. This is an advantage because the gas pressure affects the metallurgical reactions inside the furnace. Compared to this example (Fig. 3), even if there is no damper 15, or there is a damper 15, the gas vent pipe 16 and the damper 17
Needless to say, it is possible to adjust the fall amount of the preliminary reduced iron even if there is no such thing.
なお、この複合炉10は固定(定置)式の炉であって傾
動手段をもたないが、内部の耐火物施工等の便宜上、炉
体は数箇所のフランジ部分(図示せず)によって分離可
能に接合されている。Although this combined furnace 10 is a fixed (stationary) type furnace and does not have a tilting means, the furnace body can be separated by several flanges (not shown) for convenience such as installing refractories inside. is joined to.
以上、三つの実施例を紹介したか、これらのほかにも例
えば下記のように、本発明には種々の実施態様が考えら
れる。Above, three embodiments have been introduced, and in addition to these, various embodiments of the present invention can be considered, for example, as described below.
a)流動層式予備還元炉が、分散板を備えず、代わりに
風箱と流動層室との境界部の径を小さくしたものであっ
てもよい。a) The fluidized bed pre-reduction furnace may not include a dispersion plate, but instead may have a smaller diameter at the boundary between the wind box and the fluidized bed chamber.
b)鉄鉱石を原料として銑鉄を得るための装置に限らず
、他の金属酸化物鉱石などから合金鉄(フェロアロイ)
等を得るための溶融還元装置としても適用できる。b) Not only equipment for obtaining pig iron using iron ore as raw material, but also ferroalloys from other metal oxide ores, etc.
It can also be applied as a melting reduction device for obtaining etc.
[発明の効果]
本発明(請求項1・2)の溶融還元装置には下記の効果
がある。[Effects of the Invention] The melting reduction apparatus of the present invention (claims 1 and 2) has the following effects.
イ)特別な払出し手段を設けることなく、予備還元炉か
ら溶融還元炉へ予備還元鉄(鉄鉱石)を送ることかでき
る。b) It is possible to send pre-reduced iron (iron ore) from the pre-reduction furnace to the smelting reduction furnace without providing any special discharging means.
口)予備還元炉を出た予備還元鉄は、溶融還元炉へ同か
う管路でも高温の還元ガスと接触して加熱・還元を継続
されるので、溶融還元炉への投入温度か高くなりそこで
の熱動↑か改善される。また、同じ理由で、鉄鉱石か予
備還元炉内に滞留すべき時間か短縮され、生産の能率化
か図れる。(1) The pre-reduced iron that has left the pre-reduction furnace continues to be heated and reduced by contacting high-temperature reducing gas in the same conduit to the smelting-reduction furnace, so the temperature at which it is introduced into the smelting-reduction furnace becomes high. Thermal dynamics ↑ or improved. Furthermore, for the same reason, the time the iron ore must stay in the preliminary reduction furnace can be shortened, leading to more efficient production.
ハ)溶融還元炉から発生するダストが、予備還元炉まで
のガスの通路(本発明の管路)内に付着・堆積しに(い
。c) Dust generated from the smelting reduction furnace adheres and accumulates in the gas passage (pipe line of the present invention) to the preliminary reduction furnace.
二)予備還元炉で風箱内に落下した予備還元鉄は管路を
通って溶融還元炉に至り、風箱の底部に堆積することが
ないので、長期間運転を続けても、それを除去するなど
の作業は不要である。2) The pre-reduced iron that falls into the wind box in the pre-reduction furnace reaches the smelting reduction furnace through a pipe and does not accumulate at the bottom of the wind box, so it can be removed even if the operation continues for a long time. There is no need to do this.
第1図は、本発明の第一実施例としての溶融還元装置に
つき概要断面を示す図面である。また第2図および第3
図はそれぞれ、本発明の第二・第三の実施例を示す正面
図および断面図である。
方、第4図は、従来の溶融還元装置の断面図である。
l・予備還元炉、lb・・風箱、2・・・溶融還元炉、
3・・管路、4・・排ガス管、5・・開度調整タンパ1
0・複合炉、11・・・予備還元炉部分、12・溶融還
元炉部分、14 排ガス管、15・17・・開度調整
タンパ16・ガス抜き管。FIG. 1 is a schematic cross-sectional view of a melting reduction apparatus as a first embodiment of the present invention. Also, Figures 2 and 3
The figures are a front view and a sectional view showing second and third embodiments of the present invention, respectively. On the other hand, FIG. 4 is a sectional view of a conventional melt reduction apparatus. l・Preliminary reduction furnace, lb・・wind box, 2・・melting reduction furnace,
3. Pipe line, 4. Exhaust gas pipe, 5. Opening adjustment tamper 1
0. Combined furnace, 11. Preliminary reduction furnace part, 12. Melting reduction furnace part, 14. Exhaust gas pipe, 15. 17. Opening adjustment tamper 16. Gas venting pipe.
Claims (1)
の風箱から導入し金属酸化物鉱石に接触させたうえ上方
の排ガス管より排出する流動層式予備還元炉とを備える
金属の溶融還元装置に於て、(a)予備還元炉の風箱底
部と溶融還元炉の上部とを、前者から後者への金属酸化
物鉱石の通路と後者から前者への上記ガスの通路とを兼
ねる管路によってつなぐとともに、(b)予備還元炉の
排ガス管に開度調整ダンパを設けた ことを特徴とする溶融還元装置。 2、溶融還元炉と、その発生ガスを還元ガスとして下方
の風箱から導入し金属酸化物鉱石に接触させたうえ上方
の排ガス管より排出する流動層式予備還元炉とを備える
金属の溶融還元装置に於て、(a)予備還元炉の風箱底
部と溶融還元炉の上部とを、前者から後者への金属酸化
物鉱石の通路と後者から前者への上記ガスの通路とを兼
ねる管路によってつなぐとともに、(c)予備還元炉の
風箱もしくは溶融還元炉の上部に、開度調整ダンパを有
するガス抜き管を接続した ことを特徴とする溶融還元装置。[Claims] 1. A smelting reduction furnace, and a fluidized bed pre-reduction furnace in which the generated gas is introduced as a reducing gas from a lower wind box, brought into contact with metal oxide ore, and then discharged from an upper exhaust gas pipe. (a) The bottom of the wind box of the pre-reduction furnace and the upper part of the smelting reduction furnace are connected to a passage for metal oxide ore from the former to the latter and a passage for the gas from the latter to the former. A smelting reduction apparatus characterized in that it is connected by a pipe line that also serves as a passage, and (b) an opening adjustment damper is provided in the exhaust gas pipe of the preliminary reduction furnace. 2. Melting reduction of metals equipped with a smelting reduction furnace and a fluidized bed pre-reduction furnace in which the generated gas is introduced as a reducing gas from a lower wind box, brought into contact with metal oxide ore, and then discharged from an upper exhaust gas pipe. In the apparatus, (a) a conduit connecting the bottom of the wind box of the preliminary reduction furnace and the top of the smelting reduction furnace, which serves as a passage for metal oxide ore from the former to the latter and a passage for the above gas from the latter to the former; (c) A gas venting pipe having an opening adjustment damper is connected to the wind box of the preliminary reduction furnace or the upper part of the melting reduction furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17363890A JPH07122087B2 (en) | 1990-06-30 | 1990-06-30 | Smelting reduction device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17363890A JPH07122087B2 (en) | 1990-06-30 | 1990-06-30 | Smelting reduction device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0463216A true JPH0463216A (en) | 1992-02-28 |
JPH07122087B2 JPH07122087B2 (en) | 1995-12-25 |
Family
ID=15964319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17363890A Expired - Fee Related JPH07122087B2 (en) | 1990-06-30 | 1990-06-30 | Smelting reduction device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07122087B2 (en) |
-
1990
- 1990-06-30 JP JP17363890A patent/JPH07122087B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07122087B2 (en) | 1995-12-25 |
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