JP2001279312A - Method for removing substance stuck inside rotary kiln type reduction furnace - Google Patents
Method for removing substance stuck inside rotary kiln type reduction furnaceInfo
- Publication number
- JP2001279312A JP2001279312A JP2000091928A JP2000091928A JP2001279312A JP 2001279312 A JP2001279312 A JP 2001279312A JP 2000091928 A JP2000091928 A JP 2000091928A JP 2000091928 A JP2000091928 A JP 2000091928A JP 2001279312 A JP2001279312 A JP 2001279312A
- Authority
- JP
- Japan
- Prior art keywords
- rotary kiln
- furnace
- type reduction
- reduction furnace
- kiln type
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、ロータリーキルン
式還元炉の炉内付着物除去方法に関する。The present invention relates to a method for removing deposits in a rotary kiln type reduction furnace.
【０００２】[0002]
【従来の技術】金属酸化物含有原料は、還元剤や成分調
整剤などとともにロータリーキルン式還元炉に投入さ
れ、バーナーからロータリーキルン内へ放射された火炎
によって加熱されつつ、撹拌されて、還元される。2. Description of the Related Art A metal oxide-containing raw material is put into a rotary kiln type reduction furnace together with a reducing agent and a component adjusting agent, and is stirred and reduced while being heated by a flame radiated from a burner into the rotary kiln.
【０００３】しかし、炉内温度によっては、被処理物の
軟化半溶融物がロータリーキルンの内壁に付着し始め、
時間経過とともに付着物の厚さが増大し、堰を形成して
しまい、ついには原料やスラグが下流へ向かって移動で
きなくなる。このように付着物が所定の厚さ以上となっ
た場合あるいは付着物が成長し原料の流れを阻害した
り、ロータリーキルンの処理能力が低下してきた場合
に、従来は、ロータリーキルン式還元炉を停止し、炉内
温度を下げた後に、人力あるいは重機械などの手段によ
り、炉内付着物を機械的に除去し、再度運転を始めてい
た。[0003] However, depending on the furnace temperature, the softened semi-molten material to be processed starts to adhere to the inner wall of the rotary kiln,
As time elapses, the thickness of the deposit increases, forming a weir, and eventually the raw material or slag cannot move downstream. Conventionally, when the deposit becomes a predetermined thickness or more, or when the deposit grows and obstructs the flow of the raw material, or when the processing capacity of the rotary kiln is reduced, the rotary kiln type reduction furnace is conventionally stopped. After the temperature in the furnace was lowered, deposits in the furnace were mechanically removed by means of human power or heavy machinery, and the operation was started again.
【０００４】また、実開平６−２０９９号、特開２００
０−１８８３０号には、ハンマーやスクリュー部材など
を用いて、運転中に機械的にロータリーキルン内部の付
着物を除去する方法が開示されているが、炉内温度が１
２００℃を越えるような高温のロータリーキルンには、
熱的な耐久性の観点からこのような機械的な付着物除去
装置を適用することは不可能である。Further, Japanese Utility Model Laid-Open No. 6-2099,
No. 0-18830 discloses a method of mechanically removing deposits inside a rotary kiln during operation using a hammer, a screw member, or the like.
For a rotary kiln with a high temperature of over 200 ° C,
From the viewpoint of thermal durability, it is impossible to apply such a mechanical deposit removing device.
【０００５】なお、本明細書において、「金属酸化物」
の語には、酸化鉄のみならず、Ｃｕ、Ｔｉ、Ｃｒ、Ｎｉ
等の非鉄金属の酸化物も含まれる。[0005] In this specification, "metal oxide"
Are not only iron oxide but also Cu, Ti, Cr, Ni
And the like are also included.
【０００６】[0006]
【発明が解決しようとする課題】上記従来技術において
は、ロータリーキルン式還元炉の降温・再昇温による休
止時間が長く、ロータリーキルンの稼働率を低下させ、
かつ、付着物除去作業は付着物落下などが起こる可能性
のある危険な作業であり、また昇降温による耐火物の損
傷などの問題がある。In the above-mentioned prior art, the downtime of the rotary kiln type reduction furnace due to the temperature reduction and reheating is long, and the operation rate of the rotary kiln is reduced.
The adhering matter removing operation is a dangerous operation that may cause the adhering object to fall, and has a problem such as damage to a refractory due to temperature rise and fall.
【０００７】この問題点に鑑みて、鋭意研究開発し本発
明に至ったものであり、本発明の目的は、ロータリーキ
ルン式還元炉を昇降温することなく、比較的短時間のう
ちに炉内付着物を除去する新しい方法を提供する事にあ
る。In view of this problem, the present inventors have made intensive research and development and have arrived at the present invention. An object of the present invention is to provide a rotary kiln type reduction furnace with a relatively short time without having to raise and lower its temperature. It is to provide a new method of removing a kimono.
【０００８】[0008]
【課題を解決するための手段】上記目的は、請求項１に
記載のロータリーキルン式還元炉の炉内付着物除去方
法、すなわち、金属酸化物含有原料を炭素質固体還元剤
を用いて還元するロータリーキルン式還元炉において、
半溶融物がロータリーキルンの内壁に付着し、付着物が
所定の厚さ以上となった場合に、金属酸化物含有原料の
投入を中止し、還元剤のみを投入して炉内の還元雰囲気
を維持した状態で運転する、具体的にはロータリーキル
ン排ガス中の酸素濃度を０〜１％、一酸化炭素濃度が１
〜５％になるよう空気量を調整することにより、ロータ
リーキルンの炉内付着物を溶融・除去することができ
る。An object of the present invention is to provide a method for removing deposits in a rotary kiln type reduction furnace according to claim 1, that is, a rotary kiln for reducing a metal oxide-containing raw material using a carbonaceous solid reducing agent. In the type reduction furnace,
When the semi-molten matter adheres to the inner wall of the rotary kiln and the adhered substance becomes more than the specified thickness, the charging of the metal oxide-containing raw material is stopped and only the reducing agent is charged to maintain the reducing atmosphere in the furnace. Operation, specifically, the oxygen concentration in the exhaust gas of the rotary kiln is 0 to 1%, and the carbon monoxide concentration is 1%.
By adjusting the amount of air so as to be ５5%, deposits in the furnace of the rotary kiln can be melted and removed.
【０００９】[0009]
【作用】金属酸化物含有原料の投入を中止し、還元剤の
みを投入するとともに空気供給量を減らした状態で運転
すると、付着物を構成している金属酸化物が、投入した
還元剤と装入空気を減じた効果による還元雰囲気との相
剰効果により、還元・溶融され、これにより、付着物全
体が徐々に溶融・除去される。When the operation of supplying the metal oxide-containing raw material is stopped and only the reducing agent is supplied and the air supply amount is reduced, the metal oxide forming the deposits is loaded with the supplied reducing agent. Reduction and melting are caused by a surplus effect with the reducing atmosphere due to the effect of reducing the incoming air, whereby the entire attached matter is gradually melted and removed.
【００１０】[0010]
【発明の実施の形態】以下、添付図面を参照して、本発
明の実施形態について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１１】図１は、本発明の実施形態のロータリーキ
ルンの正面断面を示す概略図である。FIG. 1 is a schematic diagram showing a front cross section of a rotary kiln according to an embodiment of the present invention.
【００１２】ロータリーキルン１は円筒形状であり、外
面は外皮鋼板１０１によって被われ、その内側には耐火
レンガ１０２が内張りされている。上流開口端１１０
（図１において左端）が、被処理物及び排ガスを放出す
る下流開口端１２０よりもわずかに高く、中心軸１０５
がほぼ水平となるように配置してある。The rotary kiln 1 has a cylindrical shape, the outer surface of which is covered with a skin steel plate 101, and a refractory brick 102 is lined inside. Upstream open end 110
1 (left end in FIG. 1) is slightly higher than the downstream open end 120 for discharging the object to be treated and the exhaust gas,
Are arranged to be substantially horizontal.
【００１３】上流開口端１１０はフロントウォール１０
３によって閉鎖されているが、重油バーナー１３０がフ
ロントウォール１０３を貫通してあり、重油バーナー１
３０の火炎１３５をロータリーキルン１の内部に放射し
ている。また、フロントウォール１０３には、金属酸化
物含有原料等投入ホッパー１０６のほかに還元剤投入ホ
ッパー１０７が取り付けられている。さらに、フロント
ウォール１０３には空気吹き込み口１０８が取り付けら
れており、調整弁１０９によって、ロータリーキルン内
への空気導入量を調整することができる。The upstream open end 110 is connected to the front wall 10.
3, the fuel oil burner 130 penetrates the front wall 103, and the fuel oil burner 1
The thirty flames 135 are radiated into the rotary kiln 1. The front wall 103 is provided with a reducing agent charging hopper 107 in addition to the metal oxide-containing raw material charging hopper 106. Further, an air blowing port 108 is attached to the front wall 103, and the amount of air introduced into the rotary kiln can be adjusted by the adjusting valve 109.
【００１４】ロータリーキルン１は中心軸１０５のまわ
りに回転しており、金属酸化物含有原料等２は撹拌され
ながら、上流から下流へ向かって徐々に移動しつつ加熱
され、金属酸化物は還元され、下流開口端１２０へ向か
って移動し、ついに下流開口端１２０の下部から落下す
る。The rotary kiln 1 rotates around the central axis 105, and the metal oxide-containing raw material 2 is heated while being gradually moved from upstream to downstream while being stirred, so that the metal oxide is reduced. It moves toward the downstream open end 120 and finally falls from below the downstream open end 120.
【００１５】しかしながら、ロータリーキルン１の内壁
に付着する付着物の厚さが所定値以上となると、被処理
物の下流への移動が妨げられてしまう。However, if the thickness of the deposits on the inner wall of the rotary kiln 1 exceeds a predetermined value, the movement of the workpiece to the downstream is hindered.
【００１６】[0016]
【実施例】本実施例においては、金属酸化物として酸化
鉄含有ダストを用い、直径４．２ｍ、長さ１４ｍのロー
タリーキルンを用い、付着物の厚さが６００ｍｍに達し
た時に、上記通常運転を停止し、付着物除去運転に切り
替える。酸化鉄含有原料等投入ホッパー１０６を閉じ、
酸化鉄含有原料等の投入を停止し、一方、還元剤投入ホ
ッパーを開いて、１０ｍｍアンダーの粒度の石炭を約１
ｔｏｎ／ｈで連続投入した。炉内温度は１３００℃以上
とし、通常運転時よりも５０℃程度高めとした。また、
ロータリーキルン１への空気吹き込み量を減らして、ロ
ータリーキルン内が酸化雰囲気にならないように保つ。
付着物除去運転を続けると、付着物を構成している鉄含
有酸化物が還元・溶融されるため、付着物全体が徐々に
除去されて、約２４時間で、付着物の厚さは１００ｍｍ
程度に低減された。この程度の厚さの付着物であれば、
通常運転を行う上で障害とならない。EXAMPLE In this example, a dust-containing iron oxide was used as a metal oxide, a rotary kiln having a diameter of 4.2 m and a length of 14 m was used. When the thickness of the deposit reached 600 mm, the above-mentioned normal operation was performed. Stop and switch to the deposit removal operation. Close the iron oxide-containing raw material input hopper 106,
The charging of the iron oxide-containing raw material and the like was stopped, and the reducing agent charging hopper was opened to remove coal having a particle size of under 10 mm to about 1 mm.
Continuously charged at ton / h. The temperature in the furnace was 1300 ° C. or higher, which was about 50 ° C. higher than that during normal operation. Also,
The amount of air blown into the rotary kiln 1 is reduced to keep the inside of the rotary kiln from becoming an oxidizing atmosphere.
When the deposit removal operation is continued, the iron-containing oxide constituting the deposit is reduced and melted, so that the entire deposit is gradually removed, and in about 24 hours, the thickness of the deposit is 100 mm.
Reduced to a degree. If the deposit is about this thick,
Does not hinder normal operation.
【００１７】[0017]
【発明の効果】本発明に係る炉内付着物除去方法によれ
ば、比較的短時間のうちに付着物を除去し、運転を再開
でき、ロータリーキルン式還元炉の休止期間を短縮し、
炉の稼動率を向上できる。また、炉の昇降温による耐火
物が損傷防止され、付着物の人か重機による除去作業が
解消されるという効果が得られる。According to the method for removing deposits in a furnace according to the present invention, the deposits can be removed in a relatively short time, the operation can be resumed, the downtime of the rotary kiln type reduction furnace can be shortened,
Furnace operation rate can be improved. In addition, the refractory due to the temperature rise and fall of the furnace is prevented from being damaged, and the effect of removing the attached matter by a person or a heavy machine is eliminated.
【図１】本発明の実施形態のロータリーキルンの正面断
面を示す概略図である。FIG. 1 is a schematic diagram showing a front cross section of a rotary kiln according to an embodiment of the present invention.
１ ロータリーキルン １０１ 外皮鋼板 １０２ 耐火レンガ １０３ フロントウォール １０５ 中心軸 １０６ 金属酸化物含有原料等投入ポッパー １０７ 還元剤投入ホッパー １１０ 上流開口端 １２０ 下流開口端 １３０ 重油バーナー ３ 還元物 DESCRIPTION OF SYMBOLS 1 Rotary kiln 101 Skin steel plate 102 Refractory brick 103 Front wall 105 Center axis 106 Metal oxide containing raw material input popper 107 Reducing agent input hopper 110 Upstream open end 120 Downstream open end 130 Heavy oil burner 3 Reduced material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小出 浩 和歌山県和歌山市湊1850番地 住友金属工 業株式会社和歌山製鉄所内 (72)発明者 森下 茂 和歌山県和歌山市湊1850番地 住友金属工 業株式会社和歌山製鉄所内 Ｆターム(参考） 4K001 AA08 AA09 AA10 AA19 AA27 BA05 DA05 GA07 HA01 4K012 CA04 DD06 4K061 AA08 BA02 BA04 CA23 DA01 FA01 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroshi Koide 1850 Minato, Wakayama City, Wakayama Prefecture Sumitomo Metal Industries, Ltd. F-term in the Wakayama Works (reference) 4K001 AA08 AA09 AA10 AA19 AA27 BA05 DA05 GA07 HA01 4K012 CA04 DD06 4K061 AA08 BA02 BA04 CA23 DA01 FA01
Claims (1)
を用いて還元するロータリーキルン式還元炉において、
半溶融物がロータリーキルンの内壁に付着し、付着物が
所定の厚さ以上となった場合に、金属酸化物含有原料の
投入を中止し、還元剤のみを投入して炉内の還元雰囲気
を維持した状態で運転するロータリーキルン式還元炉の
炉内付着物を溶融除去する方法。1. A rotary kiln type reduction furnace for reducing a metal oxide-containing raw material using a carbonaceous solid reducing agent,
When the semi-molten matter adheres to the inner wall of the rotary kiln and the adhered substance becomes more than the specified thickness, the charging of the metal oxide-containing raw material is stopped and only the reducing agent is charged to maintain the reducing atmosphere in the furnace. A method for melting and removing deposits in a rotary kiln type reduction furnace that is operated in a state where the furnace is operated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000091928A JP3878390B2 (en) | 2000-03-29 | 2000-03-29 | In-furnace deposit removal method for rotary kiln reduction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000091928A JP3878390B2 (en) | 2000-03-29 | 2000-03-29 | In-furnace deposit removal method for rotary kiln reduction furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001279312A true JP2001279312A (en) | 2001-10-10 |
| JP3878390B2 JP3878390B2 (en) | 2007-02-07 |
Family
ID=18607336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000091928A Expired - Fee Related JP3878390B2 (en) | 2000-03-29 | 2000-03-29 | In-furnace deposit removal method for rotary kiln reduction furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3878390B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008297624A (en) * | 2007-06-04 | 2008-12-11 | Sumitomo Heavy Ind Ltd | Apparatus and method for reduction processing |
| KR20160100997A (en) * | 2013-12-19 | 2016-08-24 | 타타 스틸 네덜란드 테크날러지 베.뷔. | Method to operate a smelt cyclone |
-
2000
- 2000-03-29 JP JP2000091928A patent/JP3878390B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008297624A (en) * | 2007-06-04 | 2008-12-11 | Sumitomo Heavy Ind Ltd | Apparatus and method for reduction processing |
| KR20160100997A (en) * | 2013-12-19 | 2016-08-24 | 타타 스틸 네덜란드 테크날러지 베.뷔. | Method to operate a smelt cyclone |
| KR102369474B1 (en) * | 2013-12-19 | 2022-03-02 | 타타 스틸 네덜란드 테크날러지 베.뷔. | Method to operate a smelt cyclone |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3878390B2 (en) | 2007-02-07 |
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