JPH06128617A - Operation of two step tuyere melting reduction furnace - Google Patents

Operation of two step tuyere melting reduction furnace

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Publication number
JPH06128617A
JPH06128617A JP4277026A JP27702692A JPH06128617A JP H06128617 A JPH06128617 A JP H06128617A JP 4277026 A JP4277026 A JP 4277026A JP 27702692 A JP27702692 A JP 27702692A JP H06128617 A JPH06128617 A JP H06128617A
Authority
JP
Japan
Prior art keywords
raceway
tuyeres
furnace
determined
coke
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
Application number
JP4277026A
Other languages
Japanese (ja)
Other versions
JP3298942B2 (en
Inventor
Taro Kusakabe
太郎 日下部
Hiroshi Itaya
宏 板谷
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 Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP27702692A priority Critical patent/JP3298942B2/en
Publication of JPH06128617A publication Critical patent/JPH06128617A/en
Application granted granted Critical
Publication of JP3298942B2 publication Critical patent/JP3298942B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

PURPOSE:To operate a furnace in the stable furnace condition by controlling the size of a raceway in an upper step tuyere, at the time of producing molten iron, etc., in the vertical type coke packing furnace providing the upper and the lower tuyeres. CONSTITUTION:From the upper step tuyeres 4 in the vertical type smelting reduction furnace 1 having reducing agent packing layer by supplying carbonaceous reducing agent of bulky coke, etc., from the carboneceous supplying device 6, powdery and granular ore 7 and flux 8 as slag-making agent are blown together with hot blast from a high temp. blower 2 and oxygen from an oxygen supplying device 13, and from the lower step tuyeres 5, the hot blast and the oxygen are blown. The powdery and granular ore and the flux are melted in the raceways formed at the tip parts of the upper step tuyeres 4 and reduced with coke while dripping to the lower step tuyeres 5, and molten iron and molten slag are produced and discharged from a molten iron tapping hole 15 and a molten slag tapping hole. In this case, by adjusting the degree of the coke and the blasting condition, the size of the raceway is controlled to the suitable size, and the lowering of productivity caused by excess small raceway, the aggravation of the nace condition by blow-by of the powdery and granular raw material caused by excess large raceway, are prevented.

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、製鉄または合金鉄製造
に関する竪型溶融還元炉の操業方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a vertical smelting reduction furnace for producing iron or ferroalloy.

【０００２】[0002]

【従来の技術】上下少くとも２段に羽口を有し、炭素系
固体還元剤を炉内に充填した竪型炉において、高温空気
と共に少くとも上段羽口より予備還元鉱石及びフラック
スを吹き込むことにより、溶融金属を製造する技術が報
告されている（特開昭５７−１９８２０５号公報）。2. Description of the Related Art In a vertical furnace having at least two tuyeres at the top and bottom and having a carbon-based solid reducing agent filled in the furnace, blowing pre-reducing ore and flux from at least the upper tuyeres with high temperature air. Discloses a technique for producing a molten metal (Japanese Patent Laid-Open No. 57-198205).

【０００３】図１に示すように、炭材充填層型溶融還元
炉１は、上段羽口４と下段羽口５を備え、炉上方の炭材
供給装置６から炭素系固体還元剤が供給され炉内に充填
層を形成している。高温送風装置２から、空気などの酸
素含有の高温ガスが供給され、高温送風分配装置３はこ
れを上下羽口４，５に分配する。粉粒状鉱石供給装置７
及びフラックス供給装置８から供給物を受けて、これら
の粉粒体を羽口に吹き込む装置９は粉粒体輸送管１０を
経て上段羽口４に粉粒体を供給する。一方、酸素供給装
置１３から酸素を上下段羽口４、５に流量調節弁１１、
１２を介して単独もしくは高温ガスと混合して供給す
る。炉内で溶融したメタルは出銑口１５から排出され、
スラグは出滓口１４から排出される。炭材充填層型溶融
還元炉１から排出したガスは排ガス処理装置１６で処理
される。As shown in FIG. 1, a carbonaceous material packed bed type smelting reduction furnace 1 is provided with an upper stage tuyeres 4 and a lower stage tuyeres 5, and a carbonaceous solid reducing agent is supplied from a carbonaceous material supply device 6 above the furnace. A packed bed is formed in the furnace. A high-temperature gas containing oxygen such as air is supplied from the high-temperature air blower 2, and the high-temperature air blower distribution device 3 distributes this to the upper and lower tuyere 4, 5. Powdered ore supply device 7
A device 9 that receives the supply from the flux supply device 8 and blows these powders into the tuyere supplies the powder to the upper tuyere 4 via the powder transport pipe 10. On the other hand, the flow rate control valve 11, which supplies oxygen from the oxygen supply device 13 to the upper and lower tuyeres 4, 5,
It is supplied via 12 alone or mixed with a high temperature gas. The metal melted in the furnace is discharged from the tap hole 15,
The slag is discharged from the outlet 14. The gas discharged from the carbonaceous material packed bed type smelting reduction furnace 1 is processed by the exhaust gas processing device 16.

【０００４】このような溶融還元装置では、吹き込んだ
鉱石、フラックスは、羽口前に形成される高温のレース
ウェイ空間にて溶融し、この溶融物が下段羽口まで滴下
する間に炭材により溶融還元されてスラグとメタルが生
成し炉床に貯溜される。この溶融還元に必要な熱は下段
羽口前での炭材の燃焼熱により補償される。In such a smelting reduction apparatus, the blown ore and flux are melted in a high temperature raceway space formed in front of the tuyere, and the carbonaceous material is used while the melted material is dropped to the lower tuyere. It is smelted and reduced and slag and metal are generated and stored in the hearth. The heat required for this smelting reduction is compensated by the combustion heat of the carbonaceous material in front of the lower tuyeres.

【０００５】[0005]

【発明が解決しようとする課題】前記の従来技術におい
ては、溶融金属の生産速度、すなわち鉱石の溶融速度は
上段羽口前に形成されるレースウェイの大きさに強く依
存する。このためレースウェイが小さ過ぎると生産量が
確保できず、余り大きすぎると炉の中心部でレースウェ
イの吹き抜け現象が発生し、上段羽口から吹き込まれた
鉱石類はそのまま炉頂からダストとして排出され安定し
た操業ができない問題があった。In the above-mentioned prior art, the molten metal production rate, that is, the ore melting rate, strongly depends on the size of the raceway formed in front of the upper tuyeres. Therefore, if the raceway is too small, the production cannot be secured, and if it is too large, the raceway blow-through phenomenon occurs in the center of the furnace, and the ore blown from the upper tuyeres is discharged as dust from the furnace top as it is. There was a problem that stable operation was not possible.

【０００６】この理由は、上、下２段の羽口から送風さ
れる場合の上段羽口前に形成されるレースウェイの深さ
を操業中に常時測定する方法や適正に推定する方法もな
く、またそれを適正に制御する手段がなかったことによ
る。本発明はこのような実情に鑑み、目標とする生産量
に見合った適正な範囲に上段レースウェイの大きさを制
御することによりレースウェイの吹き抜けやレースウェ
イが過小になることを防止して安定した操業を確保する
技術を提供することを目的とする。[0006] The reason for this is that there is no method for constantly measuring the depth of the raceway formed in front of the upper tuyeres during operation when the air is blown from the upper and lower tuyeres, or a method for properly estimating the depth. , And because there was no means to control it properly. In view of such circumstances, the present invention prevents the raceway from passing through or becoming too small by controlling the size of the upper raceway in an appropriate range corresponding to the target production amount, and stabilizes. The purpose is to provide the technology to ensure the stable operation.

【０００７】[0007]

【課題を解決するための手段】本発明は、様々な熱間実
験、冷間実験、実炉での上段羽口レースウェイ深さの測
定を実施し、レースウェイ形成に対する動力学的検討を
重ね使用する炭材粒度、送風条件から、上段羽口レース
ウェイの深さＤr を精度よく推定する下式を開発し、こ
の推定式に基づき、上記の炭材粒度及びまたは送風条件
を調整する。According to the present invention, various hot experiments, cold experiments, and measurement of the upper tuyere raceway depth in an actual furnace were carried out, and kinetic studies on raceway formation were repeated. The following formula for accurately estimating the depth D r of the upper tuyere raceway from the used carbon material particle size and blowing condition is developed, and the above carbon material particle size and / or blowing condition is adjusted based on this estimation formula.

【０００８】[0008]

【数２】 [Equation 2]

【０００９】Ｃ1 ；レースウェイ内のガス密度、粒子に
及ぼす炉壁の抵抗力などにより決まる係数 Ｃ2 ；粒子に及ぼす炉壁の抵抗力により決まる係数 Ｃ3 ；粒子の形状係数，充填層の空隙率、炉内上昇ガス
密度、などにより決まる係数 Ｃ4 ；送風温度により決まる係数 Ｌ；上記式により決まる値 Ｕt ；上段レースウェイ内ガス速度 Ｕ；エアレーションガス速度 ρp ；粒子密度 ρgt；羽口内ガス密度 φc ；形状係数 ε；空隙率 ｇ；重力加速度 Ｈ；層高 Ｄp ；粒子径C 1 ; coefficient determined by gas density in raceway, resistance of furnace wall to particles, etc. C 2 ; coefficient determined by resistance of furnace wall to particles, C 3 ; shape factor of particles, packed bed Coefficient C 4 determined by porosity, in-furnace gas density, etc .; Coefficient determined by blast temperature L; Value determined by the above formula U t ; Upper stage raceway gas velocity U; Aeration gas velocity ρ p ; Particle density ρ gt ; Tuyere gas density φ c ; shape factor ε; porosity g; gravitational acceleration H; bed height D p ; particle size

【００１０】[0010]

【作用】本発明によれば、溶融金属の生成速度を決定す
る上段羽口前のレースウェイの大きさを適正に制御でき
るため、吹き抜けやレースウェイが過小になることによ
る生産量の低下を防止して、安定した操業を達成するこ
とができる。According to the present invention, since the size of the raceway in front of the upper tuyeres, which determines the production rate of molten metal, can be appropriately controlled, it is possible to prevent a decrease in production amount due to blow-through or an excessively small raceway. Then, stable operation can be achieved.

【００１１】[0011]

【実施例】実施例の２段羽口を有する炭材充填層型溶融
還元炉をの仕様を表１に示した。この炉を用い、目標生
産速度から決まるレースウェイの深さを設定し、本発明
の方法によりそのレースウェイ深さＤr を満足するよう
に上記（１）式を用いて炭材の粒径を調整して銑鉄と３
０％Ｃｒ含有銑の製造を行った。なお、供給酸素量１Ｎ
ｍ3 当たりの溶融メタル生産量の目標値が１．１４ｋｇ
／Ｎｍ3 、０．９４ｋｇ／Ｎｍ3 に対するレースウェイ
深さＤr は生産量の目標値に相当する炉内断面積からそ
れぞれ０．７５ｍ、０．６７ｍとなる。[Examples] Table 1 shows the specifications of the carbonaceous material packed bed type smelting reduction furnace having the two-stage tuyeres of the examples. Using this furnace, the depth of the raceway determined by the target production speed is set, and the grain size of the carbonaceous material is determined by the above formula (1) so that the raceway depth Dr is satisfied by the method of the present invention. Adjust and pig iron and 3
A pig iron containing 0% Cr was manufactured. In addition, supply oxygen amount 1N
Target value of molten metal production per m 3 is 1.14 kg
The raceway depths D r for / Nm 3 and 0.94 kg / Nm 3 are 0.75 m and 0.67 m, respectively, from the in-reactor cross-sectional area corresponding to the target value of the production amount.

【００１２】表２の比較例１、２は本発明を実施する以
前の操業例を示し、実施例１、２は比較例１、２と目標
生産量を一致させて本発明を適用した場合の操業例を示
したものである。なお、表２中の「レースウェイ深さの
設定値と実績値の差」は、図１において水冷のプローブ
１７を操業中に駆動装置１８によりレースウェイ内に挿
入して実測したレースウェイ深さと本発明による設定値
との差を示すものである。本発明によりレースウェイ深
さは非常に良好な精度で推算することが可能である。Comparative Examples 1 and 2 in Table 2 show examples of operations before carrying out the present invention, and Examples 1 and 2 show cases in which the present invention is applied with the target production amounts matched with those of Comparative Examples 1 and 2. It shows an example of operation. The difference between the set value of raceway depth and the actual value in Table 2 is the raceway depth measured by inserting the water-cooled probe 17 into the raceway by the drive device 18 during operation in FIG. It shows the difference from the set value according to the present invention. The present invention allows the raceway depth to be estimated with very good accuracy.

【００１３】表２に示すように、本発明を実施すること
により、比較例に比べ、生産量は目標値に対して好精度
で一致させることができ、しかも溶融金属の温度変動も
著しく改善され安定した操業が可能になった。また、吹
き抜けの発生やレースウェイが過小となることを完全に
防止することができた。As shown in Table 2, by carrying out the present invention, the production amount can be matched with the target value with good accuracy and the temperature fluctuation of the molten metal is remarkably improved as compared with the comparative example. Stable operation became possible. In addition, it was possible to completely prevent the occurrence of blow-by and the raceway being too small.

【００１４】[0014]

【表１】 [Table 1]

【００１５】[0015]

【表２】 [Table 2]

【００１６】[0016]

【発明の効果】本発明によれば生産量に見合うレースウ
ェイ深さを設定し、このレースウェイ深さを満足するよ
うに、２段羽口式溶融還元炉の計算式を用いて炭材の粒
径及び又は送風条件を調整することにより、安定した操
業を続けることができる。According to the present invention, the raceway depth corresponding to the production amount is set, and the carbonaceous material of the two-stage tuyere type smelting reduction furnace is calculated so as to satisfy the raceway depth. Stable operation can be continued by adjusting the particle size and / or the blowing conditions.

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

【図１】本発明の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of the present invention.

【符号の説明】[Explanation of symbols]

１ 炭材充填層型溶融還元炉 ２ 高温送風装
置 ３ 高温送風分配装置 ４ 上段羽口 ５ 下段羽口 ６ 炭材供給装
置 ７ 粉粒状鉱石供給装置 ８ フラックス
供給装置 ９ 粉粒体羽口吹込装置 １０ 粉粒体輸送
管 １１ 上段羽口流量調節弁 １２ 下段羽口流
量調節弁 １３ 酸素供給装置 １４ 出滓口 １５ 出銑口 １６ 排ガス処理
装置 １７ プローブ １８ 駆動装置1 Carbonaceous material packed bed type smelting reduction furnace 2 High temperature air blower 3 High temperature air blower distribution device 4 Upper stage tuyeres 5 Lower stage tuyeres 6 Carbonaceous material feeders 7 Granular ore feeders 8 Flux feeder 9 Powdered tuyeres blower 10 Powder and granular material transport pipe 11 Upper stage tuyere flow rate control valve 12 Lower stage tuyere flow rate control valve 13 Oxygen supply device 14 Outlet port 15 Outlet port 16 Exhaust gas treatment device 17 Probe 18 Drive device

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 炭素系固体還元剤の充填層が形成され、
この充填層下部に高温空気を吹き込む上下２段の羽口を
有する竪型炉を用いて、少くとも上段の羽口から粉粒状
の金属酸化物を吹き込み溶融金属を製造する方法におい
て、レースウェイ深さＤr を溶融金属の目標生産速度か
ら設定し、そのレースウェイの深さＤ r を満足するよう
に炭材粒度及び／又は送風条件を次式を用いて調整する
ことを特徴とする２段羽口式溶融還元炉の操業方法。 【数１】 Ｃ1 ；レースウェイ内のガス密度、粒子に及ぼす炉壁の
抵抗力などにより決まる係数 Ｃ2 ；粒子に及ぼす炉壁の抵抗力により決まる係数 Ｃ3 ；粒子の形状係数，充填層の空隙率、炉内上昇ガス
密度などにより決まる係数 Ｃ4 ；送風温度により決まる係数 Ｌ；上記式により決まる値 Ｕt ；上段レースウェイ内ガス速度 Ｕ；エアレーションガス速度 ρp ；粒子密度 ρgt；羽口内ガス密度 φc ；形状係数 ε；空隙率 ｇ；重力加速度 Ｈ；層高 Ｄp ；粒子径1. A packed bed of a carbon-based solid reducing agent is formed,
The upper and lower tuyeres that blow hot air into the bottom of this packed bed
Using a vertical furnace that I have, at least from the tuyeres on the upper stage to powder
In the method of producing molten metal by injecting other metal oxides
Raceway depth Dr The target production rate of molten metal
And set the raceway depth D r To satisfy
Adjust carbonaceous material particle size and / or blast condition using the following formula
A method for operating a two-stage tuyere type smelting reduction furnace, which is characterized in that [Equation 1]C1 ; Gas density in raceway, effect of furnace wall on particles
Coefficient C determined by resistance etc.2 ; Coefficient C determined by resistance of furnace wall to particles3 Shape factor of particles, porosity of packed bed, rising gas in furnace
Coefficient C determined by density etc.Four ; Coefficient determined by blast temperature L; Value determined by the above formula Ut ; Upper raceway gas velocity U; Aeration gas velocity ρp Particle density ρgt; Gas density in tuyere φc Shape factor ε; porosity g; gravitational acceleration H; bed height Dp ;Particle size
JP27702692A 1992-10-15 1992-10-15 Operation method of two-stage tuyere type smelting reduction furnace Expired - Fee Related JP3298942B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27702692A JP3298942B2 (en) 1992-10-15 1992-10-15 Operation method of two-stage tuyere type smelting reduction furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27702692A JP3298942B2 (en) 1992-10-15 1992-10-15 Operation method of two-stage tuyere type smelting reduction furnace

Publications (2)

Publication Number Publication Date
JPH06128617A true JPH06128617A (en) 1994-05-10
JP3298942B2 JP3298942B2 (en) 2002-07-08

Family

ID=17577742

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008508423A (en) * 2004-07-30 2008-03-21 ポスコ Pig iron manufacturing apparatus for blowing pulverized carbonaceous material into molten gasification furnace and pig iron manufacturing method
KR100880367B1 (en) 2008-06-02 2009-01-30 삼보이엔씨 주식회사 Process for constructing diffuser in the water
US7662210B2 (en) 2004-07-30 2010-02-16 Posco Apparatus for manufacturing molten irons by injecting fine coals into a melter-gasifier and the method using the same
CN113049429A (en) * 2021-03-15 2021-06-29 上海大学 Device and method for simulating surface melting loss of blast furnace tuyere small sleeve and crystallizer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008508423A (en) * 2004-07-30 2008-03-21 ポスコ Pig iron manufacturing apparatus for blowing pulverized carbonaceous material into molten gasification furnace and pig iron manufacturing method
US7662210B2 (en) 2004-07-30 2010-02-16 Posco Apparatus for manufacturing molten irons by injecting fine coals into a melter-gasifier and the method using the same
JP2011047053A (en) * 2004-07-30 2011-03-10 Posco Apparatus and method for producing molten iron including blowing fine carbonaceous material into melting gasifier
KR100880367B1 (en) 2008-06-02 2009-01-30 삼보이엔씨 주식회사 Process for constructing diffuser in the water
CN113049429A (en) * 2021-03-15 2021-06-29 上海大学 Device and method for simulating surface melting loss of blast furnace tuyere small sleeve and crystallizer
CN113049429B (en) * 2021-03-15 2023-02-17 上海大学 Device and method for simulating surface melting loss of blast furnace tuyere small sleeve and crystallizer

Also Published As

Publication number Publication date
JP3298942B2 (en) 2002-07-08

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