JPH05171234A - Method for charging raw material into smelting reduction furnace and chute for charging raw material into smelting reduction furnace - Google Patents

Method for charging raw material into smelting reduction furnace and chute for charging raw material into smelting reduction furnace

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Publication number
JPH05171234A
JPH05171234A JP34509791A JP34509791A JPH05171234A JP H05171234 A JPH05171234 A JP H05171234A JP 34509791 A JP34509791 A JP 34509791A JP 34509791 A JP34509791 A JP 34509791A JP H05171234 A JPH05171234 A JP H05171234A
Authority
JP
Japan
Prior art keywords
reduction furnace
raw material
smelting reduction
coarse
iron ore
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.)
Pending
Application number
JP34509791A
Other languages
Japanese (ja)
Inventor
Katsuhiro Iwasaki
克博 岩崎
Teruyuki Hasegawa
輝之 長谷川
Kenji Takahashi
謙治 高橋
Masahiro Muroya
正廣 室屋
Osamu Yamase
治 山瀬
Hironori Fukushima
裕法 福島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP34509791A priority Critical patent/JPH05171234A/en
Publication of JPH05171234A publication Critical patent/JPH05171234A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To produce molten iron in good yield of raw material by returning fine powdery iron ore and powdery coal generated from a smelting reduction furnace and a pre-reduction furnace together with coarse grain iron ore and coal back to the smelting reduction furnace, in the iron ore smelting reduction furnace providing the pre-reduction furnace. CONSTITUTION:The coarse grain iron ore from the fluidized bed type pre-reduction 2 is charged into the converter type smelting reduction furnace 1 through a chute 5. High temp. reducing exhaust gas containing dust generated from the smelting reduction furnace 1 is subjected to the fine powdery dust separation in a cyclone 3 and supplied into a fine powdery dust carrying pipe 9 or into a chute 7 for pulverized coal from a cyclone 4 by changing over dumpers 12a, 12b with a carrier gas 11 of N2, etc. It is then connected to the chute 5 for coarse granular into ore and a chute 6 for coarse granular coal and supplied into the smelting reduction furnace 1 together with the coarse granular iron ore and coal. The high temp. exhaust gas from the smelting reduction furnace 1 is supplied into the pre-reduction furnace 2 after separating the dust by the cyclone 3 and the coarse granular iron ore in the furnace is pre-reduced in the solid phase and charged into the smelting reduction furnace 1 through the chute 5 and the fine powdery raw material in the dust is effectively utilized.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は鉄鉱石や燃料及び還元材
である炭材等の原料（以下、両者を一括して説明する場
合には、単に原料と言う）を溶融還元炉に装入する方法
及び溶融還元炉の原料装入シュ−トに関する。BACKGROUND OF THE INVENTION The present invention charges a raw material such as iron ore, fuel, and carbonaceous material as a reducing material (hereinafter, simply referred to as raw material when both are collectively described) into a smelting reduction furnace. And a raw material charging shunt for a smelting reduction furnace.

【０００２】[0002]

【従来の技術】転炉型溶融還元炉を用いる鉄鉱石の溶融
還元においては、溶融還元炉内へ予備還元された鉄鉱石
や石炭等の炭材が供給されると共に、酸素が吹き込まれ
る。In the smelting reduction of iron ore using a converter type smelting reduction furnace, pre-reduced carbonaceous materials such as iron ore and coal are supplied into the smelting reduction furnace, and oxygen is blown into the smelting reduction furnace.

【０００３】この際、炉内へ原料を装入する手段の一つ
として、炉体の底部或いは炉腹部を貫通させた原料装入
管を設け、この原料装入管によって原料を気流輸送して
炉内の溶湯中へ直接吹き込む操作（所謂インジェクショ
ン方式）が行われている。又、原料を炉上部から重力落
下させて装入する操作も行われている。At this time, as one of the means for charging the raw material into the furnace, a raw material charging pipe penetrating the bottom or the abdomen of the furnace is provided, and the raw material charging pipe is used to carry the material by air flow. The operation of directly blowing into the molten metal in the furnace (so-called injection method) is performed. Further, an operation is also performed in which the raw material is dropped from the upper part of the furnace by gravity and charged.

【０００４】[0004]

【発明が解決しようとする課題】しかし、上記何れの原
料装入技術にも、次のような問題がある。まず、インジ
ェクション方式は、原料を直接溶湯中に吹き込むので、
反応性がよく、且つ原料の歩留もよいと言う利点がある
が、次のように設備面での問題がある。However, any of the above-mentioned raw material charging techniques has the following problems. First of all, the injection method blows the raw materials directly into the molten metal,
It has the advantages of good reactivity and good yield of raw materials, but has the following problems in terms of equipment.

【０００５】 原料を細かく粉砕する必要があり、各
原料それぞれの系統に微粉砕工程を設けなければならな
い。 気流輸送の流速は非常に速いので、装入される原料
粒子による配管の磨耗が激しく、配管の耐用期間が短
い。 炉内への吹き出し口に溶鉄やスラグが凝固し茸状の
付着物（所謂、マッシュルーム）が生成するため、原料
装入管の吹き出し口が詰まり易く、酸素洗浄による溶解
操作を行わなければならない。 炭材を吹き込む場合には、炭塵爆発を防止するため
の防爆設備にしなければならない。It is necessary to finely pulverize the raw materials, and it is necessary to provide a fine pulverization step for each system of each raw material. Since the flow velocity of pneumatic transportation is very high, the wear of the pipe due to the charged raw material particles is severe and the service life of the pipe is short. Molten iron and slag are solidified at the outlet of the furnace to form mushroom-like deposits (so-called mushrooms), so the outlet of the raw material charging pipe is easily clogged, and the melting operation by oxygen cleaning must be performed. When blowing carbonaceous material, explosion-proof equipment must be used to prevent coal dust explosion.

【０００６】次に、重力落下による装入は、インジェク
ション方式のように、原料を微粉砕する処理が必要でな
く、その他に係る設備面での問題はないが、粉原料を装
入する場合、この粉原料の粒子が炉内から発生するガス
の上昇流によって炉外に飛散し、これによって原料歩留
が低下すると言う問題がある。この場合、特に比重の小
さい炭材の粉末が飛散し易く、その影響が大きい。[0006] Next, the charging by gravity dropping does not require a finely pulverizing process of the raw material as in the injection system, and there is no problem in terms of other facilities, but when charging the powder raw material, There is a problem that the particles of the powder raw material are scattered outside the furnace by the upward flow of the gas generated from the inside of the furnace, thereby lowering the raw material yield. In this case, the carbonaceous material powder, which has a particularly low specific gravity, easily scatters, which has a large effect.

【０００７】ところで、溶融還元の操業時には、粗粒品
の原料（粗粒原料）だけではなく、粉状品の原料（粉原
料）も装入しなくてはならないことが多い。上記の粉原
料としては、粉炭等があるが、この他に、溶融還元炉か
ら飛散するダスト（鉄鉱石や炭材のダスト）や、予備還
元炉から飛散する鉄鉱石のダスト等があり、これらのダ
ストも捕集して溶融還元炉へ装入しなければならない。
従って、上記２方式のうち、設備面での問題がない重力
落下方式を採用しようとすれば、粉原料の飛散を抑制す
る措置を講じなければならない。By the way, at the time of smelting reduction operation, it is often necessary to charge not only the raw material for coarse particles (coarse raw material) but also the raw material for powdery products (powder raw material). As the above-mentioned powder raw material, there are pulverized coal and the like, but in addition to this, there are dust (iron ore and carbonaceous material dust) scattered from the smelting reduction furnace, and iron ore dust scattered from the preliminary reduction furnace. Must also be collected and charged into the smelting reduction furnace.
Therefore, if the gravity drop method, which does not cause a problem in terms of equipment, is adopted from the above two methods, measures must be taken to suppress the scattering of the powder raw material.

【０００８】本発明はこのような問題に鑑みてなされた
もので、粉原料の飛散を抑制できる重量落下方式よる溶
融還元炉への原料装入方法及びこの方法を実施するため
の溶融還元炉の原料装入シュ−トを提供することを目的
とする。The present invention has been made in view of the above problems, and is a method of charging a raw material into a smelting reduction furnace by a weight drop method capable of suppressing the scattering of powder raw materials and a smelting reduction furnace for carrying out this method. The purpose is to provide a raw material charging shoe.

【０００９】[0009]

【課題を解決するための手段】上記の目的を達成するた
めに、第一の発明である原料装入方法は、溶融還元炉へ
粉原料と粗粒原料を装入するに際し、装入されている粗
粒原料流の中に粉原料を装入し、粉原料流の周囲を粗粒
原料流で囲む状態にして粉原料と粗粒原料を装入する。In order to achieve the above object, the raw material charging method according to the first aspect of the present invention is used when charging a powder raw material and a coarse grain raw material into a smelting reduction furnace. The powder raw material is charged into the existing coarse-grain raw material stream, and the powder raw material and the coarse-grain raw material are charged so that the periphery of the powder raw material stream is surrounded by the coarse-grain raw material flow.

【００１０】又、第二の発明である原料装入シュ−ト
は、溶融還元炉の上部に接続されているものであって、
粉原料輸送管が挿着され、且つこの粉原料輸送管の位置
が出口部において中心付近に配置されている。The raw material charging shunt according to the second aspect of the invention is connected to the upper part of the smelting reduction furnace,
The powder raw material transport pipe is inserted, and the position of the powder raw material transport pipe is arranged near the center at the outlet.

【００１１】[0011]

【作用】本発明の原料装入方法においては、粉原料は炉
内発生ガスによる飛散が起こらない粗粒原料の流れで囲
まれた状態で装入されるので、粉原料と炉内発生ガスの
上昇流とが接触する度合が小さくなり、粉原料の飛散が
抑えられる。In the raw material charging method of the present invention, the powder raw material is charged in a state of being surrounded by the flow of the coarse-grained raw material which is not scattered by the gas generated in the furnace. The degree of contact with the upward flow is reduced, and scattering of the powder raw material is suppressed.

【００１２】又、本発明の原料装入シュ−トは、粉原料
輸送管が粗粒原料シュ−トの中心付近に挿入されて取り
付けられており、粉原料が粗粒原料の流れで囲まれた状
態で装入されるようになっているので、粉原料の飛散が
抑制される。Further, in the raw material charging shunt according to the present invention, the powder raw material transport pipe is inserted and attached near the center of the coarse-grain raw material shoot, and the powder raw material is surrounded by the flow of the coarse-grain raw material. Since it is loaded in the state of being charged, scattering of the powder raw material is suppressed.

【００１３】なお、原料装入シュ−トが設けられて原料
の装入が行われる炉上部、即ち、炉口付近は炉内発生ガ
スの上昇流速が最も速い箇所であるが、炉口付近は原料
が装入された直後の位置であり、装入された原料の流れ
が未だ広がっていないので、粉原料は粗粒原料の流れに
十分に包囲された状態で装入され、炉内発生ガス流への
随伴が防止される。It should be noted that the upper part of the furnace, in which the raw material is charged and the raw material is charged, that is, the vicinity of the furnace opening is the location where the rising velocity of the gas generated in the furnace is the fastest, but the vicinity of the furnace opening is This is the position immediately after the raw material is charged, and since the flow of the charged raw material has not spread yet, the powdered raw material is charged while being sufficiently surrounded by the flow of the coarse-grained raw material, and the gas generated in the furnace Entrainment in the flow is prevented.

【００１４】[0014]

【実施例】以下、本発明の詳細を図面に基づいて説明す
る。図１は本発明の原料装入方法に係る一実施例の説明
図である。この図の説明においては、炭材として石炭を
用いている。図１において、１は転炉型の溶融還元炉、
２は溶融還元炉１に装入する粗粒鉱石を溶融還元炉１か
ら発生するガスによって予備還元するための流動層式の
予備還元炉、３は溶融還元炉１から発生するガス中のダ
ストを捕集するためのサイクロン（以下、溶融還元炉の
サイクロンと言う）、４は予備還元炉２から排出するガ
ス中のダストを捕集するためのサイクロン（以下、予備
還元炉のサイクロンと言う）である。又、５は予備還元
炉２から溶融還元炉の上部に接続され、原料装入シュ−
トの一つである粗粒鉄鉱石装入シュ−ト、６は溶融還元
炉１の上部に接続され、他の原料装入シュ−トである粗
粒炭装入シュ−ト、７は粉原料の一つである粉炭の輸送
管である。２０は溶鉄、２１はスラグを示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of one embodiment of the raw material charging method of the present invention. In the description of this figure, coal is used as the carbonaceous material. In FIG. 1, 1 is a converter type smelting reduction furnace,
Reference numeral 2 is a fluidized bed type pre-reduction furnace for pre-reducing coarse-grained ore charged into the smelting reduction furnace 1 with gas generated from the smelting reduction furnace 1, and 3 is dust in the gas generated from the smelting reduction furnace 1. Cyclones for collecting (hereinafter referred to as smelting reduction cyclones), 4 are cyclones for collecting dust in the gas discharged from the preliminary reduction furnace 2 (hereinafter referred to as preliminary reduction furnace cyclones) is there. Further, 5 is connected from the pre-reduction furnace 2 to the upper part of the smelting reduction furnace, and the raw material charging shroud
Coarse-grain iron ore charging shunt, which is one of the grate, 6 is connected to the upper portion of the smelting reduction furnace 1, and other raw material charging shunt, coarse-grain carbon charging shunt, 7 is powder. This is a transport pipe for pulverized coal, which is one of the raw materials. 20 shows molten iron and 21 shows slag.

【００１５】上記溶融還元装置において、溶融還元炉１
には、予備還元炉２から粗粒鉄鉱石装入シュ−ト５を経
由して粗粒鉄鉱石が装入され、又、粗粒炭装入シュ−ト
６から粗粒炭が装入され、更に、粉炭輸送管７からは窒
素又は溶融還元炉からの発生ガス等のキャリアガスによ
る気体輸送によって粉炭が装入される。この粉炭は、粗
粒炭装入シュ−ト６中の粗粒鉄鉱石の流れの中に入れら
れ、粗粒炭の流れに囲まれるような状態にされて、溶融
還元炉１内へ装入される。なお、この他に、図示は省略
したが、石灰等のフラックスが装入されると共に、酸素
が吹き込まれる。In the above smelting reduction apparatus, the smelting reduction furnace 1
Coarse-grained iron ore is charged from the preliminary reduction furnace 2 via the coarse-grained iron ore charging shunt 5 and coarse-grained coal is charged from the coarse-grained coal charging shunt 6. Further, the pulverized coal transportation pipe 7 is charged with pulverized coal by gas transportation by a carrier gas such as nitrogen or a gas generated from the smelting reduction furnace. This pulverized coal is put into the flow of the coarse-grained iron ore in the coarse-grained coal charging shunt 6, is made to be surrounded by the flow of the coarse-grained coal, and is charged into the smelting reduction furnace 1. To be done. In addition to this, although not shown, a flux of lime or the like is charged and oxygen is blown in as well.

【００１６】溶融還元炉１から発生するガス中には、多
量のダストを含んでいるので、このダストは溶融還元炉
のサイクロン３で捕集される。又、予備還元炉２へは、
溶融還元炉１から発生するガスが還元用ガスとしての吹
き込まれるので、ここで発生するダストは予備還元炉の
サイクロン４で捕集される。上記溶融還元炉のサイクロ
ン３及び予備還元炉のサイクロン４によって捕集された
ダストは溶融還元炉１へ装入される。Since the gas generated from the smelting reduction furnace 1 contains a large amount of dust, this dust is collected by the cyclone 3 of the smelting reduction furnace. Also, to the preliminary reduction furnace 2,
Since the gas generated from the smelting reduction furnace 1 is blown as the reducing gas, the dust generated here is collected by the cyclone 4 of the preliminary reduction furnace. The dust collected by the cyclone 3 of the smelting reduction furnace and the cyclone 4 of the preliminary reduction furnace is charged into the smelting reduction furnace 1.

【００１７】まず、予備還元炉のサイクロン４で捕集さ
れたダストは、配管１０から吹き込まれる窒素又は溶融
還元炉からの発生ガス等のキャリアガスによって気流輸
送される。このダストは、ダスト輸送管９から粗粒鉄鉱
石装入シュ−ト５中の粗粒鉄鉱石の流れの中に入れら
れ、粗粒鉄鉱石の流れに囲まれるような状態にされて溶
融還元炉１内へ装入される。First, the dust collected by the cyclone 4 of the preliminary reduction furnace is transported by air by a carrier gas such as nitrogen blown from the pipe 10 or a gas generated from the smelting reduction furnace. This dust is put into the coarse iron ore flow in the coarse iron ore charging shunt 5 from the dust transport pipe 9, and is made to be surrounded by the flow of the coarse iron ore and melt-reduced. It is charged into the furnace 1.

【００１８】又、溶融還元炉のサイクロン３で捕集され
たダストは、配管１１から吹き込まれる上記のようなキ
ャリアガスによって気流輸送され、ダンパー１２ａ，１
２ｂの切り替えによって、ダスト輸送管８ａから粉炭輸
送管７中の粉炭に混入されるか、又は、ダスト輸送管８
ｂからダスト輸送管９中のダストに混入される。このよ
うに、溶融還元炉のサイクロン３で捕集されたダスト
は、予備還元炉のダスト又は粉炭に混入され、粗粒鉄鉱
石の流れ又は粗粒炭の流れに囲まれるような状態にされ
て溶融還元炉１内へ装入される。Further, the dust collected by the cyclone 3 of the smelting reduction furnace is pneumatically transported by the carrier gas as described above blown from the pipe 11 and the dampers 12a, 1a.
By switching 2b, the dust transport pipe 8a mixes with the pulverized coal in the pulverized coal transport pipe 7, or the dust transport pipe 8
It is mixed in the dust in the dust transport pipe 9 from b. In this way, the dust collected by the cyclone 3 in the smelting reduction furnace is mixed with the dust or pulverized coal in the preliminary reduction furnace, and is made to be surrounded by the flow of coarse iron ore or the flow of coarse coal. It is charged into the smelting reduction furnace 1.

【００１９】図２は本発明の原料装入シュ−トに係る一
実施例を模式的に表した説明図であり、図３は図２にお
けるIII − III矢視図であり、原料装入シュ−トの端面
を示す。図２、図３において、１は転炉型の溶融還元炉
であり、２０は溶鉄、２１はスラグを示す。５は原料装
入シュ−トの一つであって、予備還元炉から溶融還元炉
１の上部に接続された粗粒鉄鉱石装入シュ−ト、９は上
端が予備還元炉のサイクロンに接続され、下端部が上記
粗粒鉄鉱石装入シュ−ト５中に挿入されている捕集ダス
トの輸送管である。又、６は他の原料装入シュ−トであ
って、溶融還元炉１の上部に接続された粗粒炭装入シュ
−ト、７は下端部が上記粗粒炭装入シュ−ト５中に挿入
されている炭粉の輸送管である。FIG. 2 is an explanatory view schematically showing an embodiment of a raw material charging shoe of the present invention, and FIG. 3 is a view taken along the line III--III in FIG. -Shows the end face of the g. 2 and 3, 1 is a converter type smelting reduction furnace, 20 is molten iron, and 21 is slag. Reference numeral 5 is one of the raw material charging shunts, and a coarse iron ore charging shunt connected from the preliminary reduction furnace to the upper part of the smelting reduction furnace 1, and 9 is connected at its upper end to a cyclone of the preliminary reduction furnace. The lower end portion is a transport pipe for the collected dust inserted in the coarse iron ore charging shunt 5. Further, 6 is another raw material charging shoe, which is a coarse-grained coal charging shoe connected to the upper part of the smelting reduction furnace 1, and 7 is a lower end portion which is the coarse-grained carbon charging shoe 5 It is a coal powder transport tube inserted inside.

【００２０】そして、捕集ダストの輸送管９及び粉炭の
輸送管７は、それぞれ粗粒鉄鉱石装入シュ−ト５及び粗
粒炭装入シュ−ト６の出口部において中心付近に位置す
るように挿入された配置になっている。The collected dust transport pipe 9 and the pulverized coal transport pipe 7 are located near the center at the outlets of the coarse iron ore charging shunt 5 and the coarse coal charging shunt 6, respectively. It is arranged so that it is inserted.

【００２１】このように、捕集ダストの輸送管９や粉炭
の輸送管７が、粗粒鉄鉱石装入シュ−ト５や粗粒炭装入
シュ−ト６の出口部の中心付近に配置されていると、気
体輸送によって吹き込まれた粉原料の流れは、飛散しな
い粗粒鉄鉱石や粗粒炭等の粗粒原料の流れで囲まれた状
態になる。As described above, the transport pipe 9 for the collected dust and the transport pipe 7 for the pulverized coal are arranged near the center of the outlet of the coarse iron ore charging shunt 5 and the coarse coal charging shunt 6. Then, the flow of the powdered raw material blown by gas transportation is surrounded by the flow of the coarse-grained raw material such as coarse-grained iron ore and coarse-grained coal that do not scatter.

【００２２】（実施例）図１で説明した方法を実施で
き、図２及び図３に示した原料装入シュ−トが設けられ
た５０ｔｏｎ／日の転炉型の溶融還元炉を使用した操業
を行った。なお、溶融還元炉のサンクロンで捕集したダ
ストは粗粒鉄鉱石装入シュ−トから装入した。この際の
操業条件は次の通りにした。(Embodiment) Operation using the smelting reduction furnace of the converter type of 50 ton / day which can carry out the method described in FIG. 1 and is equipped with the raw material charging shunt shown in FIGS. 2 and 3. I went. The dust collected by the Sancron of the smelting reduction furnace was charged from a coarse iron ore charging shunt. The operating conditions at this time were as follows.

【００２３】 送酸量 ；１６００〜１９００Ｎｍ3 ／ｈ 排ガス量；５０００〜５５００Ｎｍ3 ／ｈ 圧力 ；１．３〜１．４ｋｇ／cm2 Ｇ 原料装入；鉱石 ３０〜４０ｋｇ／min 、石炭 ３５〜
４３ｋｇ／min 原料粒度；粗粒鉱石 ５ｍｍ以下、粗粒石炭 ５〜３０
ｍｍ、粉石炭 ３ｍｍ 粗粒石炭と粉石炭の比；８：２ この操業における原料の飛散率は表１のごとくであっ
た。Acid supply amount: 1600 to 1900 Nm 3 / h Exhaust gas amount: 5000 to 5500 Nm 3 / h Pressure: 1.3 to 1.4 kg / cm 2 G Raw material charge; Ore 30 to 40 kg / min, Coal 35 to 35
43 kg / min Raw material particle size; coarse ore 5 mm or less, coarse coal 5-30
mm, pulverized coal 3 mm Ratio of coarse-grained coal to pulverized coal; 8: 2 The scattering rate of raw materials in this operation is as shown in Table 1.

【００２４】[0024]

【表１】 [Table 1]

【００２５】（比較例）操業条件は上記実施例と同じに
し、粗粒原料と粉原料はそれぞれ単独で装入した。この
操業における原料の飛散率も表１に示す。上記の実施例
の値と従来技術である比較例の値を比べてると、表１の
ように、実施例の値は比較例の値に対し、特に、石炭の
飛散率低下に著しい効果をもたらしている。即ち、３％
〜５％であった鉄鉱石の飛散率が２％〜３％に低下し
（低下率３０％〜４０％）、十分の効果をもたらしてい
るが、石炭の場合には、２０％〜３０％もあった飛散率
が３％〜５％に低下した（低下率約８５％）。(Comparative Example) The operating conditions were the same as in the above example, and the coarse-grain raw material and the powder raw material were separately charged. Table 1 also shows the scattering rate of the raw materials in this operation. Comparing the value of the above-mentioned example with the value of the comparative example which is a conventional technique, as shown in Table 1, the value of the example has a remarkable effect on the reduction of the scattering rate of coal, in particular, with respect to the value of the comparative example. ing. That is, 3%
The iron ore scattering rate, which was ~ 5%, decreased to 2% to 3% (reduction rate 30% to 40%), which provided a sufficient effect, but in the case of coal, 20% to 30% The scattering rate also decreased to 3% to 5% (reduction rate of about 85%).

【００２６】[0026]

【発明の効果】本発明の原料装入方法は、溶融還元炉へ
粉原料と粗粒原料を装入するに際し、装入されている粗
粒原料流の中に粉原料を装入し、粉原料流の周囲を粗粒
原料流で囲む状態にして粉原料と粗粒原料を装入するも
のである。又、本発明の原料装入シュ−トは、溶融還元
炉の上部に接続され、粉原料輸送管が挿着され、且つこ
の粉原料輸送管の位置が出口部において中心付近に配置
されている。EFFECT OF THE INVENTION The raw material charging method of the present invention, when charging the powder raw material and the coarse particle raw material into the smelting reduction furnace, charges the powder raw material into the charged coarse particle raw material stream, The raw material stream is surrounded by the coarse grain raw material stream, and the powder raw material and the coarse grain raw material are charged. Further, the raw material charging shoe of the present invention is connected to the upper part of the smelting reduction furnace, the powder raw material transport pipe is inserted, and the position of the powder raw material transport pipe is arranged near the center at the outlet portion. ..

【００２７】本発明の原料装入方法によるか、又は本発
明の原料装入シュ−トを備えれば、粉原料は炉内発生ガ
スによる飛散が起きない粗粒原料の流れで囲まれた状態
で装入されるので、粉原料と炉内発生ガスの上昇流とが
接触する度合が小さくなる。従って、粉原料の飛散率が
低下し、原料歩留が向上する。According to the raw material charging method of the present invention, or if the raw material charging shout of the present invention is provided, the powder raw material is surrounded by a flow of coarse-grain raw material which is not scattered by the gas generated in the furnace. Since the charging is carried out by the method described above, the degree of contact between the powder raw material and the upward flow of the gas generated in the furnace becomes small. Therefore, the scattering rate of the powder raw material is reduced and the raw material yield is improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の原料装入方法に係る一実施例の説明図
である。FIG. 1 is an explanatory diagram of an embodiment of a raw material charging method of the present invention.

【図２】本発明の原料装入シュ−トに係る一実施例を模
式的に表した説明図である。FIG. 2 is an explanatory view schematically showing an embodiment of a raw material charging shoe of the present invention.

【図３】図２におけるIII − III矢視図である。FIG. 3 is a view taken along the line III-III in FIG.

【符号の説明】[Explanation of symbols]

１ 転炉型溶融還元炉 ２ 予備還元炉 ３ 溶融還元炉のサイクロン ４ 予備還元炉のサイクロン ５ 粗粒鉄鉱石装入シュ−ト ６ 粗粒炭装入シュ−ト ７ 粉炭輸送管 ８ａ、８ｂ 溶融還元炉のサイクロンで捕集したダスト
の輸送管 ９ 予備還元炉のサイクロンで捕集したダストの輸送管1 Converter type smelting reduction furnace 2 Preliminary reduction furnace 3 Cyclone of smelting reduction furnace 4 Cyclone of preliminary reduction furnace 5 Coarse-grained iron ore charging shunt 6 Coarse-grained coal charging shunt 7 Pulverized coal transportation pipe 8a, 8b Melting Transport pipe for dust collected by cyclone of reduction furnace 9 Transport pipe for dust collected by cyclone of preliminary reduction reactor

フロントページの続き (72)発明者 室屋 正廣 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内 (72)発明者 山瀬 治 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内 (72)発明者 福島 裕法 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内Front Page Continuation (72) Inventor Masahiro Muroya 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) Inventor Osamu Yamase 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Incorporated (72) Inventor Yuho Fukushima 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 溶融還元炉へ粉原料と粗粒原料とを装入
するに際し、装入されている粗粒原料流の中に粉原料を
装入し、粉原料流の周囲を粗粒原料流で囲む状態にして
粉原料と粗粒原料を装入する溶融還元炉への原料装入方
法。1. When charging a raw powder material and a coarse raw material into a smelting reduction furnace, the raw raw material is charged into the coarse raw material stream being charged, and the raw material stream is surrounded by the coarse raw material. A method for charging raw materials into a smelting reduction furnace in which powdered raw materials and coarse-grained raw materials are charged in a state of being surrounded by a flow. 【請求項２】 粉原料輸送管が挿着され、且つこの粉原
料輸送管の位置が出口部において中心付近に配置され、
溶融還元炉の上部に接続された溶融還元炉の原料装入シ
ュ−ト。2. A powder raw material transport pipe is inserted, and the position of the powder raw material transport pipe is arranged near the center at the outlet portion,
Raw material charging shunt of the smelting reduction furnace connected to the upper part of the smelting reduction furnace.
JP34509791A 1991-12-26 1991-12-26 Method for charging raw material into smelting reduction furnace and chute for charging raw material into smelting reduction furnace Pending JPH05171234A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34509791A JPH05171234A (en) 1991-12-26 1991-12-26 Method for charging raw material into smelting reduction furnace and chute for charging raw material into smelting reduction furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34509791A JPH05171234A (en) 1991-12-26 1991-12-26 Method for charging raw material into smelting reduction furnace and chute for charging raw material into smelting reduction furnace

Publications (1)

Publication Number Publication Date
JPH05171234A true JPH05171234A (en) 1993-07-09

Family

ID=18374268

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34509791A Pending JPH05171234A (en) 1991-12-26 1991-12-26 Method for charging raw material into smelting reduction furnace and chute for charging raw material into smelting reduction furnace

Country Status (1)

Country Link
JP (1) JPH05171234A (en)

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