JPH05271735A - Method for effectively utilizing dust in furnace top exhaust gas in coke packing layer type vertical furnace - Google Patents
Method for effectively utilizing dust in furnace top exhaust gas in coke packing layer type vertical furnaceInfo
- Publication number
- JPH05271735A JPH05271735A JP7176592A JP7176592A JPH05271735A JP H05271735 A JPH05271735 A JP H05271735A JP 7176592 A JP7176592 A JP 7176592A JP 7176592 A JP7176592 A JP 7176592A JP H05271735 A JPH05271735 A JP H05271735A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- exhaust gas
- raw material
- slurry
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コークス充填層型堅形
炉の炉頂排ガス中のダストの有効利用方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for effectively utilizing dust in the top exhaust gas of a coke packed bed type fixed furnace.
【０００２】[0002]
【従来の技術】一般に、コークス充填層型竪形溶融還元
炉では、炉頂から排出する排ガス中のダスト濃度は約３
０〜５０ｇ／Ｎｍ3 である。このダスト中には、炉頂か
ら炉内に装入したコークスが、未燃の微粉状で混合して
おり、ダスト中のカーボン割合が約５０％と高いことが
特徴である。2. Description of the Related Art Generally, in a vertical coke packed bed vertical smelting reduction furnace, the dust concentration in the exhaust gas discharged from the furnace top is about 3
It is 0 to 50 g / Nm 3 . Coke charged into the furnace from the furnace top is mixed in the dust in the form of unburned fine powder, and the carbon content in the dust is high at about 50%.
【０００３】従来、上記ダストの処理は、排ガスの乾式
集塵や、湿式集塵により回収し、鉄鉱石の焼結鉱製造工
場に搬送し、コークス（エネルギ源）を含む鉄源ダスト
として、焼結鉱製造用原料として使用していた。Conventionally, in the treatment of the above dust, exhaust gas is collected by dry dust collection or wet dust collection, transported to an iron ore sinter ore manufacturing plant, and burned as iron source dust containing coke (energy source). It was used as a raw material for mine production.
【０００４】[0004]
【発明が解決しようとする課題】前記の従来技術では、
コークス充填層型溶融還元炉の排ガス中のダスト量が多
く、また、ダスト中に多量の未燃カーボンを含んでいる
ことから、金属（溶銑）１トンを製造するために使用す
るコークス量（以下、コークス比）が多くなり、原料コ
ークスが多量に必要である。In the above prior art,
The amount of dust in the exhaust gas of the coke packed bed type smelting reduction furnace is large, and since a large amount of unburned carbon is included in the dust, the amount of coke used to produce 1 ton of metal (hot metal) (hereinafter , Coke ratio) is increased, and a large amount of raw coke is required.
【０００５】したがって、従来の回収したダストを系外
に搬出するプロセスでは、コークス（熱エネルギ）を有
効に利用していないという問題がある。また、回収され
た多量のダストを系外に搬送するための費用も大きいと
いう問題もある。Therefore, there is a problem that coke (heat energy) is not effectively utilized in the conventional process for discharging the recovered dust out of the system. There is also a problem that the cost for transporting a large amount of collected dust to the outside of the system is high.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記の問題点
を解決するために、炉頂から排出した排ガス中のダスト
を湿式集塵機で回収し、脱水し、スラリー状にした後、
本製造プロセスの原料処理工程に供給し、２次脱水処理
と、噴霧乾燥処理を行い、原料粉鉱として回収した後、
再び、上段羽口から竪型溶融還元炉内へ吹込むことによ
り、炉頂排ガスから回収したダストを系内で循環利用す
るものである。In order to solve the above-mentioned problems, the present invention collects dust in exhaust gas discharged from the furnace top with a wet dust collector, dehydrates it, and slurries it,
After supplying to the raw material processing step of this manufacturing process, performing secondary dehydration processing and spray drying processing, and collecting as raw material powder ore,
The dust recovered from the furnace top exhaust gas is circulated and reused in the system by blowing again from the upper tuyeres into the vertical smelting reduction furnace.
【０００７】[0007]
【作用】本発明の構成及び作用を図１により以下に説明
する。竪型溶融還元炉１から排出した排ガスは、乾式除
塵機４で１次除塵された後、湿式除塵機５で、２次除塵
される。湿式除塵機５で発生したスラリー状のダスト
は、シックナ６で濃縮され、ポンプ（Ｐ）で脱水機７に
送られる。ここで他部門から搬送されてきたスラリー状
の原料粉と共に脱水機７によって濃縮処理され、濃縮さ
れたスラリー状のダストとなる。The structure and operation of the present invention will be described below with reference to FIG. The exhaust gas discharged from the vertical smelting reduction furnace 1 is subjected to primary dust removal by the dry dust remover 4 and then secondary dust removal by the wet dust remover 5. The slurry dust generated in the wet dust remover 5 is concentrated by the thickener 6 and sent to the dehydrator 7 by the pump (P). Here, the slurry-like raw material powder conveyed from other departments is concentrated by the dehydrator 7 to be concentrated slurry-like dust.
【０００８】濃縮したスラリー状ダストは、スプレード
ライヤ１０内に噴霧される。スプレードライヤ１０には
熱風発生炉１１で発生した熱風が吹込まれ、スラリー状
ダストはこの熱風により乾燥し、スプレードライヤ１０
の下部に乾燥した原料粉として堆積する。この乾燥した
原料粉は、スプレードライヤ１０の付属集塵機１２で回
収したダストと共に貯槽１３に貯えられる。そして均排
圧タンク１４とインジェクションタンク１５を経て、上
段羽口８より竪型溶融還元炉１に吹込まれる。上記のよ
うに排ガスの除塵工程で発生する、カーボンを多量に含
むダストを回収し、これを原料として系内で循環使用す
ることにより、エネルギ源として炉に装入するコークス
を減らすことができ、コークス比の低減が可能となる。The concentrated slurry-like dust is sprayed into the spray dryer 10. The hot air generated in the hot air generating furnace 11 is blown into the spray dryer 10, and the slurry-like dust is dried by the hot air.
Is deposited as a dry raw material powder at the bottom of the. The dried raw material powder is stored in the storage tank 13 together with the dust collected by the auxiliary dust collector 12 of the spray dryer 10. Then, it is blown into the vertical smelting reduction furnace 1 from the upper tuyeres 8 through the pressure equalizing pressure tank 14 and the injection tank 15. As described above, generated in the dust removal process of the exhaust gas, by collecting the dust containing a large amount of carbon, by circulating this in the system as a raw material, it is possible to reduce the coke charged into the furnace as an energy source, The coke ratio can be reduced.
【０００９】[0009]
【実施例】図１は、本発明の一実施例を示すフロー図で
ある。実施例は、炉内容積が１０ｍ3 、羽口組数（上
下）が１組の竪型溶融還元炉１で、原料粉としてＣｒ系
ダストを用い、原料吹込量が７３０ｇ／Ｎｍ3 、送風中
酸素濃度を３０％として、Ｃｒ銑鉄を製造した。1 is a flow chart showing an embodiment of the present invention. Examples furnace capacity is 10 m 3, tuyere sets the number (up and down) is a set of vertical smelting reduction furnace 1, using a Cr-based dust as raw material powder, the raw material blowing amount 730 g / Nm 3, blowing in Cr pig iron was produced with an oxygen concentration of 30%.
【００１０】溶融還元炉１から排出した排ガスから回収
し、シックナ６で濃縮されたスラリー状のダストは、水
分が約８０％であり、ダストの成分はＣ：５０％、Ｔ．
Ｆｅ：９％、ＳｉＯ2 ：２２％、Ａｌ2 Ｏ3 ：１１％、
Ｔ．Ｃｕ：０．４５％、Ｐ：０．１７％であった。また
脱水機７でダストの水分は約４０〜５０％であった。The slurry dust collected from the exhaust gas discharged from the smelting reduction furnace 1 and concentrated in the thickener 6 has a water content of about 80%, and the dust component is C: 50%, T.
Fe: 9%, SiO 2 : 22%, Al 2 O 3 : 11%,
T. Cu was 0.45% and P was 0.17%. The water content of the dust in the dehydrator 7 was about 40 to 50%.
【００１１】スプレードライヤ１０で噴霧乾燥した後、
上段羽口８から竪型炉１内に吹込んだ。本発明の実施に
より、排ガスから回収したカーボンを含むダストを系内
で乾燥処理し、循環使用するようにしたので、コークス
比は約３０〜５０（ｋｇ／ｔ−Ｍｅｔａｌ）低減しエネ
ルギの有効利用を図ることができた。After spray drying with the spray dryer 10,
It was blown into the vertical furnace 1 from the upper tuyeres 8. By carrying out the present invention, the dust containing carbon recovered from the exhaust gas is dried in the system and is circulated for use. Therefore, the coke ratio is reduced by about 30 to 50 (kg / t-Metal) and the energy is effectively used. Could be achieved.
【００１２】[0012]
【発明の効果】本発明は、上記のように構成したので、
ダスト中に含まれるカーボンを有効に利用することがで
き、コークス比が低減した。また、本発明の実施によ
り、従来行っていた、回収された多量のスラリー状のダ
ストを系外に搬出する費用が軽減された。Since the present invention is constructed as described above,
The carbon contained in the dust can be effectively used, and the coke ratio is reduced. Further, by carrying out the present invention, the cost of carrying out a large amount of collected slurry-like dust to the outside of the system, which has been conventionally performed, is reduced.
【図１】本発明のプロセスを示すフロー図である。FIG. 1 is a flow diagram showing the process of the present invention.
１ 竪型溶融還元炉 ２ コークス ３ 排ガスダスト ４ 乾式除塵
機 ５ 湿式除塵機 ６ シックナ ７ 脱水機 ８ 上段羽口 ９ 下段羽口 １０ スプレ
ードライヤ １１ 熱風発生炉 １２ 集塵機 １３ 貯槽 １４ 均排圧
タンク １５ インジェクションタンク1 Vertical smelting reduction furnace 2 Coke 3 Exhaust gas dust 4 Dry dust remover 5 Wet dust remover 6 Thickener 7 Dehydrator 8 Upper stage tuyeres 9 Lower stage tuyeres 10 Spray dryer 11 Hot air generator 12 Dust collector 13 Storage tank 14 Uniform discharge tank 15 Injection tank
Claims (1)
から排出する排ガス中のダストを湿式集塵し、スラリー
状にし、これを、該溶融還元炉の原料スラリー中に混合
し、脱水した後噴霧乾燥し、上段羽口より前記竪型溶融
還元炉に吹込むことを特徴とするコークス充填層型堅形
炉の炉頂排ガス中のダストの有効利用方法。1. Dust in exhaust gas discharged from the top of a vertical coke packed bed type vertical smelting reduction furnace is wet-collected to form a slurry, which is mixed with a raw material slurry of the melting reduction furnace and dehydrated. After that, spray drying, and blowing into the vertical smelting reduction furnace from the upper tuyeres, an effective use method of dust in the top exhaust gas of a coke packed bed type fixed furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7176592A JPH05271735A (en) | 1992-03-30 | 1992-03-30 | Method for effectively utilizing dust in furnace top exhaust gas in coke packing layer type vertical furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7176592A JPH05271735A (en) | 1992-03-30 | 1992-03-30 | Method for effectively utilizing dust in furnace top exhaust gas in coke packing layer type vertical furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05271735A true JPH05271735A (en) | 1993-10-19 |
Family
ID=13469971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7176592A Withdrawn JPH05271735A (en) | 1992-03-30 | 1992-03-30 | Method for effectively utilizing dust in furnace top exhaust gas in coke packing layer type vertical furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05271735A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0840756A (en) * | 1994-04-11 | 1996-02-13 | Voest Alpine Ind Anlagenbau Gmbh | Preparation of iron melt |
| KR100584738B1 (en) * | 2001-11-26 | 2006-05-30 | 주식회사 포스코 | Corex Operation Method |
-
1992
- 1992-03-30 JP JP7176592A patent/JPH05271735A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0840756A (en) * | 1994-04-11 | 1996-02-13 | Voest Alpine Ind Anlagenbau Gmbh | Preparation of iron melt |
| KR100584738B1 (en) * | 2001-11-26 | 2006-05-30 | 주식회사 포스코 | Corex Operation Method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990608 |