JPS62207812A - Furnace internal heating method for converter refining - Google Patents
Furnace internal heating method for converter refiningInfo
- Publication number
- JPS62207812A JPS62207812A JP5091386A JP5091386A JPS62207812A JP S62207812 A JPS62207812 A JP S62207812A JP 5091386 A JP5091386 A JP 5091386A JP 5091386 A JP5091386 A JP 5091386A JP S62207812 A JPS62207812 A JP S62207812A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- secondary combustion
- heat
- combustion zone
- additive
- 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
- 238000007670 refining Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims description 18
- 238000010438 heat treatment Methods 0.000 title abstract 2
- 238000002485 combustion reaction Methods 0.000 claims abstract description 29
- 239000000654 additive Substances 0.000 claims abstract description 28
- 230000000996 additive effect Effects 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 7
- 239000003575 carbonaceous material Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000571 coke Substances 0.000 abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 description 9
- 229910052804 chromium Inorganic materials 0.000 description 7
- 239000011651 chromium Substances 0.000 description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は転炉操業における生産能率と熱回収率（着熱
効率）の向上をはかる技術に係り、特に炉内で発生する
ＣＯガスの燃焼熱と鉄鉱石粉等の添加物を有効に利用し
て炉内着熱効率を飛躍的に高めた転炉精錬ｌこおける熱
付与方法に関する。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a technology for improving production efficiency and heat recovery rate (heat transfer efficiency) in converter operation, and in particular, to improve the production efficiency and heat recovery rate (heat transfer efficiency) in converter operation. This invention relates to a heat application method in a converter refining furnace that dramatically increases the heat transfer efficiency in the furnace by effectively utilizing additives such as stone powder.
従来技術とその問題点
従来、転炉操業における炉内熱付与方法としては大別し
て、■コークス等の炭材を添加してＣ＋ １／２０ｔ→
ＣＯ発生熱を利用する方法と、■精錬時に発生するＣＯ
ガスを炉内または炉口近傍で再燃焼（二次燃焼）してＧ
ｏ ＋ １／２０．→ｃｏ、発生熱を利用する方法が知
られている。Conventional technology and its problems Conventionally, the methods of providing heat in the furnace during converter operation can be roughly divided into: ■ C+ 1/20t by adding carbonaceous material such as coke →
How to use CO generated heat and CO generated during refining
G by re-burning the gas in the furnace or near the furnace mouth (secondary combustion)
o + 1/20. →co, a method that utilizes the generated heat is known.
しかし、■炭材添加によるＣＯ発生熱を利用する方法は
、添加炭材に含有されているｐ、ｓ等の有害元素が溶融
金属中に混入するため大量の炭材使用には制約があり、
また■発生ＣＯガスを二次燃焼させて熱不足を補う方法
は、燃焼率が低くかつ着熱効率も低いという欠点があっ
た。すなわち、従来の二次燃焼着熱機構は、ＣＯガスの
二次燃焼熱は内張耐火物の温度上昇をもたらすとともに
、スラブ表面への放射、炉内雰囲気ガスの対流伝熱によ
りスラグおよび溶融金属の温度上昇に供される一方、排
ガス顕熱上昇および炉体鉄皮からの放散熱が熱的損失と
なる。従って、ＣＯガスの二次燃焼熱を利用する方法で
は、十分に熱不足を補うことができなかった。However, the method of utilizing the heat of CO generated by adding carbonaceous materials has restrictions on the use of large amounts of carbonaceous materials because harmful elements such as P and S contained in the added carbonaceous materials mix into the molten metal.
Furthermore, the method (2) of secondary combustion of the generated CO gas to compensate for the lack of heat has the drawbacks of low combustion rate and low heat transfer efficiency. In other words, in the conventional secondary combustion heat transfer mechanism, the secondary combustion heat of CO gas causes a rise in the temperature of the lining refractory, and also heat radiation to the slab surface and convection heat transfer of the furnace atmosphere gas to reduce the slag and molten metal. On the other hand, the sensible heat increase in the exhaust gas and the heat radiated from the furnace shell result in thermal loss. Therefore, the method of utilizing the heat of secondary combustion of CO gas has not been able to sufficiently compensate for the heat deficiency.
発 明 の 目 的
この発明は従来の前記欠点を解消するためになされたも
ので、発生ＣＯガスの二次燃焼熱を利用して熱付与を行
なう方法において、鉄鋼石粉等の添加物を投入し二次燃
焼ゾーンを通過させることｌこよって該添加物を熱媒体
として有効に利用し着熱効率の向上をはかる方法を提案
することを目的とするものである。Purpose of the Invention This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and is a method for applying heat by utilizing the secondary combustion heat of generated CO gas, by adding additives such as iron and steel powder. The object of the present invention is to propose a method for improving heat transfer efficiency by passing the additive through a secondary combustion zone, thereby effectively using the additive as a heat medium.
発−明の構成
この発明に係る転炉精錬における炉内熱付与方法は、精
錬時に発生するＣＯガスを炉内または炉口近傍で燃焼さ
せて二次燃焼ゾーンを形成すると同時に、排ガス流速を
２５ｍ／ｓｅｃ以下に低下させて炉上方より粉状の鉱石
類あるいは炭材からなる添加物を炉内に投入し、該添加
物を前記二次燃焼ゾーンを通過させて熱交換した後溶融
金属浴中および／または溶融滓中に溶解させることを特
徴とするものである。Structure of the Invention The in-furnace heat application method in converter refining according to the present invention burns CO gas generated during refining in the furnace or near the furnace mouth to form a secondary combustion zone, and at the same time reduces the exhaust gas flow velocity to 25 m Additives made of powdered ores or carbonaceous materials are introduced into the furnace from above the furnace at a temperature of less than /sec, and the additives are passed through the secondary combustion zone for heat exchange and then placed in the molten metal bath. and/or is characterized by being dissolved in a molten slag.
第１図はこの発明方法の一実施態様を示す概略図で、（
１）は上下吹転炉、（２）は上吹酸素ランス、（３）は
攪拌用底吹羽口、（４）は二次燃焼用０２羽口、（５）
は排ガス吸引ダクト、（６）は添加物投入ホッパーをそ
れぞれ示す。FIG. 1 is a schematic diagram showing one embodiment of the method of the present invention.
1) is a top-bottom blowing converter, (2) is a top-blowing oxygen lance, (3) is a bottom-blowing tuyere for stirring, (4) is a 02 tuyere for secondary combustion, (5)
(6) indicates the exhaust gas suction duct, and (6) indicates the additive input hopper.
すなわち、この発明方法は転炉精錬時に発生するＣＯガ
スを０２羽口（４）から吹込むｏ２により再燃焼させて
炉内空間に二次燃焼ゾーン（７）を形成する。That is, in the method of this invention, CO gas generated during converter refining is re-burned by O2 injected from the O2 tuyere (4) to form a secondary combustion zone (7) in the furnace interior space.
この二次燃焼ゾーンは炉口近傍、あるいは炉口近傍より
さらに下方の炉内空間に形成する。次に、炉上に設けた
添加物投入ホッパー（６）より粉状添加物（８）を連続
的に切出して炉内に投入する。添加物としては、鉄鉱石
、クロム鉱石、マンガン鉱石等の鉱石類、あるいは石炭
、コークス等の炭材を用いることができる。これらの添
加物は熱伝導を考慮して可及的に乾燥（水分５％以下程
度）したものでかつ粉状（粒度２０以下程度）のものが
望ましい。これは添加物の比表面４１（表面積／体積の
比）を十分に高めて熱伝導を促進することができるため
である。This secondary combustion zone is formed near the furnace mouth or in the furnace interior space further below the vicinity of the furnace mouth. Next, the powdered additive (8) is continuously cut out from an additive charging hopper (6) provided on the furnace and charged into the furnace. As additives, ores such as iron ore, chromium ore, and manganese ore, or carbonaceous materials such as coal and coke can be used. These additives are desirably as dry as possible (water content of about 5% or less) and in powder form (particle size of about 20 or less) in consideration of heat conduction. This is because the specific surface 41 (surface area/volume ratio) of the additive can be sufficiently increased to promote heat conduction.
ただし、比表面積の高い添加物は炉上部より炉内に落下
する際、炉内で発生する上昇ガス流で排ガス系すなわち
排ガス吸引ダクト（５）へ吸引され飛散損失が増大する
傾向がある。このため、この発明では排ガスの流速を２
５ｍ／ｓｅｃ以下に限定した。However, when additives with a high specific surface area fall into the furnace from the upper part of the furnace, they tend to be sucked into the exhaust gas system, that is, the exhaust gas suction duct (5) by the rising gas flow generated within the furnace, increasing scattering loss. Therefore, in this invention, the flow rate of exhaust gas is reduced to 2.
The speed was limited to 5 m/sec or less.
すなわち、排ガス流速が２５ｍ／ｓｅｃを超えると添加
物の飛散損失が大きくなり、効果が減少する。That is, when the exhaust gas flow rate exceeds 25 m/sec, the scattering loss of the additive increases and the effect decreases.
しかし、排ガス流速を２５ｍ１ｓｅｃ以下に抑えると添
加物の飛散損失をほとんど無視できる量にまで低減でき
る。However, by suppressing the exhaust gas flow rate to 25 ml sec or less, the scattering loss of additives can be reduced to an almost negligible amount.
炉上部より炉内に落下した添加物（８）は二次燃焼ゾー
ン（７）を通過し、スラグ（９）および溶融金属αＯ中
に落下するが、二次燃焼ゾーンを通過する際この二次燃
焼熱と熱交換されて顕熱が増大し、スラグ−メタル中に
溶解する。The additive (8) that has fallen into the furnace from the upper part of the furnace passes through the secondary combustion zone (7) and falls into the slag (9) and molten metal αO. Sensible heat increases through heat exchange with combustion heat, and is dissolved into the slag-metal.
従って、この発明方法による二次燃焼着熱機構は、ＣＯ
ガスの二次燃焼熱は内張耐火物の温度上昇、スラグ表面
への放射、炉内雰囲気ガスの対流伝熱に、さらに粉状添
加物（８）の顕熱上昇に供され、スラグ（９）および溶
融金属αＱの温度上昇効果を大ならしめる。Therefore, the secondary combustion heat transfer mechanism according to the method of this invention
The secondary combustion heat of the gas increases the temperature of the lining refractory, radiates to the slag surface, convection heat transfer of the furnace atmosphere gas, and increases the sensible heat of the powdered additive (8). ) and the effect of increasing the temperature of the molten metal αQ.
実 施 例
１６０Ｔ上下吹転炉において、上吹０２量２０００ＯＮ
ｒｒ／／Ｈｒ 、底吹Ｎｔ量２０００ Ｎｍ’／Ｈｒ
、二次燃焼用０２量１００００ Ｎｎｆ／ Ｈｒで、ク
ロム鉱石をクロム源として用い１３％Ｃｒステンレス精
錬を実施した。その際、排ガス流速を２５ｍ／ｓｅｔに
抑えて、添加物として粉状クロム鉱石（粒度１′Ｈ以下
〕を均一に公役した。Example 1 In a 60T top-bottom blowing converter furnace, the top blowing amount was 2000ON.
rr//Hr, bottom blowing Nt amount 2000 Nm'/Hr
, 13% Cr stainless steel was refined using chromium ore as a chromium source at a secondary combustion O2 amount of 10,000 Nnf/Hr. At that time, the exhaust gas flow rate was suppressed to 25 m/set, and powdered chromium ore (particle size of 1'H or less) was uniformly applied as an additive.
また比較のため、粉状クロム鉱石を投入せず、排ガス流
速３０ｍ／！１ｅＣで、他は上記と同一条件で精錬を実
施した。For comparison, no powdered chromium ore was added and the exhaust gas flow rate was 30m/! Refining was carried out at 1 eC under the same conditions as above.
本実施例における装入量バランスを第１表に示す。Table 1 shows the charging amount balance in this example.
第１表より明らかなごとく、従来の二次燃焼熱のみを利
用する方法では熱源としてコークス４５０Ｉｆ／Ｔを要
したのに対し、本発明方法では添加物（クロム鉱石粉）
の顕熱上昇効果ζこより溶鋼への着熱効率が高まり、コ
ークス使用量を減少できた。As is clear from Table 1, while the conventional method using only secondary combustion heat required 450If/T of coke as a heat source, the method of the present invention uses additives (chromium ore powder).
The effect of increasing sensible heat ζ increases the efficiency of heat transfer to molten steel and reduces the amount of coke used.
第 １ 表
発 明 の 効 果
以上説明したごとく、この発明方法は精錬時に発生する
ＣＯガスを再燃焼させて発生する二次燃焼熱に加えて、
炉内に粉状添加物を投入し前記二次燃焼ゾーンを通過さ
せることによって該添加物を熱媒体として利用するので
炉内着熱効率を大幅に高めることができ、熱源としての
コークスの使用量を低減できる。従って、この発明方法
によれば、精錬コストの低減および生産能率の向上がは
かられる。Table 1 Effects of the Invention As explained above, in addition to the secondary combustion heat generated by re-burning the CO gas generated during refining, the method of this invention
By introducing powdered additives into the furnace and passing them through the secondary combustion zone, the additives are used as a heat medium, so the heat transfer efficiency in the furnace can be greatly increased, and the amount of coke used as a heat source can be reduced. Can be reduced. Therefore, according to the method of this invention, it is possible to reduce refining costs and improve production efficiency.
第１図はこの発明方法の一実施態様を示す概略図である
。
１・・・上下吹転炉、２・・・上吹酸素ランス、３・・
・攪拌用底吹羽口、４・・・二次燃焼用０２羽口、５・
・・排ガス吸引ダクト、６・・・添加物装入ホッパー、
７・・・二次燃焼ゾーン、８・・・粉状添加物、９・・
・スラグ、１０・・・溶融金属。FIG. 1 is a schematic diagram showing one embodiment of the method of this invention. 1...Top-blowing converter furnace, 2...Top-blowing oxygen lance, 3...
・Bottom blowing tuyere for stirring, 4...02 tuyere for secondary combustion, 5.
...Exhaust gas suction duct, 6...Additive charging hopper,
7...Secondary combustion zone, 8...Powdered additive, 9...
- Slag, 10... Molten metal.
Claims (1)
たは炉口近傍で燃焼させて二次燃焼ゾーンを形成すると
同時に、排ガス流速を２５ｍ／ｓｅｃ以下に低下させて
炉上方より粉状の鉱石類あるいは炭材からなる添加物を
炉内に投入し、該添加物を前記二次燃焼ゾーンを通過さ
せて熱交換した後溶融金属浴中および／または溶融滓中
に溶解させることを特徴とする転炉精錬における炉内熱
付与方法。In converter refining, CO gas generated during refining is combusted in the furnace or near the furnace mouth to form a secondary combustion zone, and at the same time, the exhaust gas flow velocity is reduced to 25 m/sec or less to collect powdered ores from above the furnace. Alternatively, an additive made of carbonaceous material is introduced into a furnace, and the additive is passed through the secondary combustion zone for heat exchange and then dissolved in a molten metal bath and/or molten slag. Method for applying heat in a furnace in furnace refining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5091386A JPS62207812A (en) | 1986-03-07 | 1986-03-07 | Furnace internal heating method for converter refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5091386A JPS62207812A (en) | 1986-03-07 | 1986-03-07 | Furnace internal heating method for converter refining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62207812A true JPS62207812A (en) | 1987-09-12 |
| JPH0478687B2 JPH0478687B2 (en) | 1992-12-11 |
Family
ID=12872017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5091386A Granted JPS62207812A (en) | 1986-03-07 | 1986-03-07 | Furnace internal heating method for converter refining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62207812A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04136113A (en) * | 1990-09-27 | 1992-05-11 | Nippon Steel Corp | Method for melting iron-contained cold material |
| JP2010163645A (en) * | 2009-01-14 | 2010-07-29 | Kobe Steel Ltd | Refining-processing method and gas recovering system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54109016A (en) * | 1977-12-10 | 1979-08-27 | Maximilianshuette Eisenwerk | Improvement of heat balance in steel making |
-
1986
- 1986-03-07 JP JP5091386A patent/JPS62207812A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54109016A (en) * | 1977-12-10 | 1979-08-27 | Maximilianshuette Eisenwerk | Improvement of heat balance in steel making |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04136113A (en) * | 1990-09-27 | 1992-05-11 | Nippon Steel Corp | Method for melting iron-contained cold material |
| JP2010163645A (en) * | 2009-01-14 | 2010-07-29 | Kobe Steel Ltd | Refining-processing method and gas recovering system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0478687B2 (en) | 1992-12-11 |
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