JPH02240207A - Tuyere for blast furnace - Google Patents
Tuyere for blast furnaceInfo
- Publication number
- JPH02240207A JPH02240207A JP6018889A JP6018889A JPH02240207A JP H02240207 A JPH02240207 A JP H02240207A JP 6018889 A JP6018889 A JP 6018889A JP 6018889 A JP6018889 A JP 6018889A JP H02240207 A JPH02240207 A JP H02240207A
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- ceramic tube
- ceramic
- tip
- porosity
- 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
- 239000000919 ceramic Substances 0.000 claims abstract description 23
- 230000002787 reinforcement Effects 0.000 claims abstract description 7
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract 3
- 230000004888 barrier function Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 19
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 13
- 229910010271 silicon carbide Inorganic materials 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 239000002893 slag Substances 0.000 description 9
- 230000003628 erosive effect Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 4
- 238000004901 spalling Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Blast Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
この発明は省エネルギー化、耐久性の向上9羽口調節用
などの多目的に使用できる高炉用羽口に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a blast furnace tuyere that can be used for multiple purposes, such as energy saving, improved durability, and tuyere adjustment.
(従来の技術)
高炉の羽口は炉内に1100℃〜1300℃の高温で、
かつ200〜230m/sの高速で熱風と重油や微粉炭
などの燃料を吹き込み燃焼させるものである。この羽口
は従来より銅製のものを用い、羽口材の保護のために強
制水冷冷却機構を備えた羽口が使用されているが、この
過酷な使用条件により短寿命に終っていると共に羽口材
の保護のために強制水冷冷却を行っているので焦損も非
常に大きなものがある。このため最近では1羽口の保護
、寿命延長対策、また省エネルギ一対策や高炉の操業上
より羽口よりの吹込み量の調節用などの諸対策として第
3図のように水冷帯2aを有する羽口1aの内側にAl
l0.系、 A t20.− S io2系またはコー
プライト系のセラミックス管3aを挿入し、モルタルセ
ット5aした羽口が使用されているが、その使用条件が
、
■ 羽口内での燃料(重油、微粉炭)の燃焼によりガス
及び熱と溶融灰分に゛よる化学的浸食度が高い。(Prior art) The tuyere of a blast furnace is heated at a high temperature of 1100°C to 1300°C inside the furnace.
Hot air and fuel such as heavy oil or pulverized coal are blown into the combustion chamber at a high speed of 200 to 230 m/s. Traditionally, these tuyeres have been made of copper and equipped with a forced water cooling mechanism to protect the tuyere material, but due to these harsh operating conditions, the lifespan of the tuyeres has been shortened and the tuyere has Because forced water cooling is used to protect the mouthpiece, burnout can be very large. For this reason, recently water cooling zone 2a has been installed as shown in Figure 3 as a measure to protect the tuyere, extend its life, save energy, and adjust the amount of air injected from the tuyere for the operation of the blast furnace. Al inside the tuyere 1a with
l0. System, A t20. - A tuyere in which a ceramic tube 3a of Sio2 type or coprite type is inserted and a mortar set 5a is used, but the conditions of use are as follows: ■ The combustion of fuel (heavy oil, pulverized coal) in the tuyere and high degree of chemical erosion due to heat and molten ash.
■ 羽口内は1100℃〜1300℃の温度となり、か
つ風速200〜230m/sのスピードで熱風及び重油
、微粉炭などの燃料が多量に吹込まれるので熱間におけ
る摩耗が非常に大きい。(2) The inside of the tuyere has a temperature of 1,100°C to 1,300°C, and a large amount of hot air and fuel such as heavy oil or pulverized coal are blown in at a speed of 200 to 230 m/s, so wear during hot conditions is extremely large.
■ セラミックス管内部は高温にさらされるが、裏面は
水冷されている銅製羽口と接触しているため、大きな温
度勾配を有している。■ The inside of the ceramic tube is exposed to high temperatures, but because the back side is in contact with the water-cooled copper tuyeres, there is a large temperature gradient.
また炉内より受ける影響としては、
(う 炉内焦(ショウ)点は理論上、2300℃ともい
われており、先端部は炉内よりの高温熱を受ける。In addition, the influence from inside the furnace is as follows: (Theoretically, the in-furnace scorching point is said to be 2300°C, and the tip receives high-temperature heat from inside the furnace.
(ロ)鉄鉱石1石灰、コークスなどにより生ずるスラグ
とアルカリによる浸食、浸透による組織の胞弱化と損傷
。(b) Iron ore 1. Tissue cell weakening and damage due to erosion and penetration by slag and alkali caused by lime, coke, etc.
Q%)COガスによるカーボン沈積及び組織への影響。Q%) Effect of CO gas on carbon deposition and structure.
などなどの機械的、化学的、熱的及び熱変化に対する抵
抗性が高くなければならない状態下にある。Under conditions such as mechanical, chemical, thermal and resistance to thermal changes must be high.
(発明が解決しようとする問題点))
前述のように現在のセラミックス管はAl2o3系、A
1.O,−8in、系、コープライト系などの材質によ
り製造し1羽口の内側に挿入して使用に供していること
より、これらの諸条件が満足させることかできず、使用
開始後、数日で先端部に異状が起こり、熱風の乱流が除
々に始まり損傷が進み1羽口の冷却水の温度上昇となり
、これに、伴ない吹込ガスの温度低下、速度低下を引き
起こすなど不利益をもたらす。このため羽口の保護、省
エネルギー化などの効果を持続させえないのが現状であ
るため、これらの諸条件を満たす耐久性の高い羽口が強
く求められている。(Problem to be solved by the invention)) As mentioned above, the current ceramic tubes are made of Al2o3 system, A
1. Since it is manufactured from materials such as O, -8in, Copelite, etc. and inserted into the inside of a tuyere for use, these conditions cannot be satisfied, and after the start of use, several After a few days, an abnormality occurs at the tip, and turbulent flow of hot air gradually begins, causing damage and increasing the temperature of the cooling water in one tuyere. bring. For this reason, it is currently not possible to maintain the effects of tuyere protection and energy saving, so there is a strong demand for highly durable tuyeres that meet these conditions.
(問題点を解決するための手段)
このような現状に鑑み、本発明者はこれらの諸条件に対
する抵抗性の高い材質を求め1種々研究を重ねた結果、
SiC含有量が90%以上で気孔率3%〜17%の耐火
材が耐機械的摩耗性が高く、かつ熱の変化、耐熱性にも
優れ、化学的にも安定していることを見い出したが、S
iC成分を90%以上を含有している素材であるため、
熱伝導率が15〜30 Kcal/ m、hr * ”
Cと高く、断熱効果が従来材に比べ低くなるため、省エ
ネルギー効果が小さくなる。この欠点を改善するために
挿入するセラミックス管の先端部を201〜100■と
内側層をSiC含有量90%以上で気孔率3%〜I7%
の材質で、外側を必要ならば任意な型で任意な個所に補
強及びセラミックス管の支持部を設け。(Means for solving the problem) In view of the current situation, the inventor of the present invention searched for a material with high resistance to these conditions, and as a result of repeated research,
It has been discovered that a refractory material with a SiC content of 90% or more and a porosity of 3% to 17% has high mechanical abrasion resistance, excellent resistance to thermal changes, and is chemically stable. But, S
Because it is a material containing more than 90% of iC ingredients,
Thermal conductivity is 15-30 Kcal/m, hr *”
C, and the insulation effect is lower than that of conventional materials, so the energy saving effect is small. To improve this defect, the tip of the inserted ceramic tube should be 201 to 100 cm, and the inner layer should have a SiC content of 90% or more and a porosity of 3% to I7%.
material, and if necessary, provide reinforcement and support for the ceramic tube at any location using any type of material.
それ以外は空障とすることにより従来高伝導性であるた
め、省エネルギー効率が低いとされ不適当材質とされて
いた成分9品質を限定した炭化珪素質材を採用すること
により耐久性が高く1羽口の保護ができ、しかも省エネ
ルギー効果の高い羽口を見い出したものである。Other than that, by making it an air barrier, we have adopted a silicon carbide material with limited quality, which was previously considered to be an inappropriate material due to its high conductivity and low energy saving efficiency.It is highly durable. We have discovered a tuyere that can protect the tuyere and has a high energy-saving effect.
(限定理由)
(A) SiCの含有量90%以上について、第1図
に示すようにSiCの含有量が90%以下となると急激
にスラグとの反応性が高まり溶損量が大きくなるためで
ある。(Reasons for limitation) (A) Regarding the SiC content of 90% or more, as shown in Figure 1, when the SiC content becomes 90% or less, the reactivity with slag increases rapidly and the amount of erosion increases. be.
* 劇転スラグ試験法
テスト条件、■1500℃、430時間(6時間×5回
の繰返しテスト)
■スラグ石炭灰
(B) 気孔率3%〜17%について1) 気孔率が
3%以内であると耐熱スポーリング性が小さくなり、カ
ケと亀裂の発生が多くなる。* Dramatic slag test method test conditions, ■1500℃, 430 hours (6 hours x 5 repeated tests) ■Slag coal ash (B) Regarding porosity 3% to 17% 1) Porosity is within 3% The heat spalling resistance decreases and chips and cracks occur more frequently.
2) 気孔率が17%以上となると1粒子間の結合性が
悪くなり、スラグの組織内への浸透による厚い変質層の
生成やスラグ付着を生じ溶損も大きくなる。2) When the porosity is 17% or more, the bonding between particles deteriorates, and the penetration of slag into the structure causes the formation of a thick altered layer, slag adhesion, and increases erosion loss.
(C) 炭化珪素材の先端部2001〜100m及び
内層について
先端部は羽口と接していないと、スラグなどの浸入があ
り、これを防ぐためと損傷状態と耐久性の点より最低を
201とする。またLoommまでとするのは熱効率を
高めるためには高熱伝導性材料はより少ない方が良いこ
とより決めた。(C) Regarding the tip 2001 to 100m of the silicon carbide material and the inner layer, if the tip is not in contact with the tuyere, slag etc. may infiltrate.To prevent this, and from the viewpoint of damage and durability, the minimum value is 201. do. Moreover, the reason for setting it to Loomm was decided because it is better to use less highly thermally conductive material in order to increase thermal efficiency.
即ちこの発明は、第2図に示すように水冷帯2を有する
羽口1内挿入のセラミックス管3の先端部を20醜〜1
00mと内側層をSiC含有量90%以上で気孔率が3
%〜17%の品質特性値を有するセラミックス材で他の
外表部を必要ならば任意な型で任意な個所に補強及びセ
ラミックス管3の支持部を設け、それ以外は金属製羽口
1との間に空障4を有する構造にモルタルセット5した
ものである。That is, in this invention, as shown in FIG.
00m and the inner layer has a SiC content of 90% or more and a porosity of 3.
% to 17% of the quality characteristic value, and if necessary, provide reinforcement and a support part for the ceramic tube 3 at any location using an arbitrary type if necessary, and otherwise connect it to the metal tuyere 1. This is a mortar set 5 with a structure having an air gap 4 between them.
(発明の効果) 次にこの発明品の効果を実施例を挙げて述べる。(Effect of the invention) Next, the effects of this invention will be described with reference to examples.
実施態様
羽口管の先端30omと内側8■を炭化珪素機 1
質焼成材で先端部30■を除く外側には必要に応じて図
4、図5に示されている様にSiC質セラミックス層の
外部に補強部及び支持部を設ける以外は羽口との間には
空障部を有する構造とする。Embodiment: The tip 30 om and the inner 8 cm of the tuyere tube are made of silicon carbide 1. The outside except for the tip 30 mm is made of a silicon carbide ceramic layer as shown in FIGS. 4 and 5 as required. The structure has an air barrier between the tuyere and the tuyere, except for the reinforcement and support parts provided on the outside of the tuyere.
なお実施例に用いた原料の化学成分値を表1に示す。Table 1 shows the chemical composition values of the raw materials used in the examples.
上記衣1の原料を用い、
■ 先端部及び内層材としてSiC材で最大粒径1.4
mとQ、Q44mの2材質の焼成品を用いる。なお使用
は先端部100mとセラミックス管支持部以外は水冷羽
口とのとの間は空間とする。Using the raw material of Clothing 1 above, ■ SiC material for the tip and inner layer material with a maximum particle size of 1.4.
Fired products made of two materials, m and Q, and Q44m are used. In use, there is a space between the tip 100m and the water-cooled tuyere except for the ceramic tube support.
■ 比較量はハイアルミナ材として合成ムライト。■ Comparison amount is synthetic mullite as a high alumina material.
焼結アルミナ材を主体とした焼成品を造り比較する。Create and compare fired products made mainly of sintered alumina material.
その結果を表2に示す。The results are shown in Table 2.
表2に示す品質特性値に示される如く、炭化珪素材は非
常に強度も高く高熱伝導性を有し、耐熱スポーリング性
も弾性率の残存率にも示されるように高い、また体スラ
グ浸食性にも秀でた特性を有している。As shown in the quality characteristic values shown in Table 2, silicon carbide material has extremely high strength and high thermal conductivity, and has high heat spalling resistance as shown in the residual rate of elastic modulus, and also has high resistance to body slag erosion. It also has excellent sexual characteristics.
以上の実施例に用いるための各材質の品質特性値の表2
にも示されている如く炭化硅素質材は非常に強度(熱間
、室温共)が高く、高熱伝導率性であり、耐熱スポーリ
ング性もスポーリング試験による弾性率の残存率にも示
されるように良好なる値を示す。Table 2 of quality characteristic values of each material used in the above examples
As shown in the above, silicon carbide materials have extremely high strength (both hot and room temperature) and high thermal conductivity, and their heat spalling resistance is also shown in the residual rate of elastic modulus in the spalling test. It shows good value.
また石炭灰による浸食試験においても非常に優れた特性
を有している。また外層部に用いるSin。It also has excellent properties in erosion tests using coal ash. Also, Sin is used for the outer layer.
−Al2O2系のキャスタブルと熱伝導率が1.59K
cal/m、hr、’Cと低く、断熱効果を充分期待で
きるものである。- Al2O2 based castable and thermal conductivity of 1.59K
It has low cal/m, hr, and 'C, and can be expected to have a sufficient heat insulating effect.
次に図面第4図及び第5図に本発明品1及び本発明品2
の実施態様を示す、なお第6図は従来品を示す。そして
図中、6はセラミックス管外部補強部、7はセラミック
ス管支持部、8は先端本体部である。Next, the drawings 4 and 5 show the invention product 1 and the invention product 2.
FIG. 6 shows a conventional product. In the figure, 6 is a ceramic tube external reinforcement part, 7 is a ceramic tube support part, and 8 is a tip main body part.
表 3
以上の材質及び態様の組合わせにより本発明品■■の2
種と比較量■を3800rn’の高炉羽口として用いた
結果は、使用開始時はいずれもほぼ同様な効果をもたら
したが、比較量■は68目より熱風の乱流が認められ、
徐々に排水温度の上昇が認められ43日間の使用で熱的
効果は認められなくなった。本発明品の2種共に初期の
効果を接続することができ、90日8に取外し点検を行
うも、その結果先端部溶損が1.6BIlと0.8mi
孔径拡大は先端より60Wmの所で1.9mと0.9閣
でカケ、亀裂などの発生も無く良好な結果を示す。Table 3 Inventive product ■■-2 by combining the above materials and aspects
The results of using seeds and comparative amount ■ as blast furnace tuyeres at 3800 rn' show that both had almost the same effect at the beginning of use, but with comparative amount ■, turbulence of hot air was observed from the 68th point onwards.
A gradual rise in wastewater temperature was observed, and no thermal effect was observed after 43 days of use. Both of the two types of products of the present invention were able to connect the initial effects, and even though they were removed and inspected on the 90th day, the results showed that the melting damage at the tip was 1.6 BIl and 0.8 mi.
The hole diameter expanded to 1.9 m at 60 Wm from the tip, showing good results with no chips or cracks.
なお羽口の再使用に当り比較量■の水冷金属羽口は修理
を必要としたが、本発明品は全く修理の必要もなく、大
きな効果をおさめることができた。Note that the water-cooled metal tuyere of Comparative Volume (1) required repair in order to reuse the tuyere, but the product of the present invention did not require repair at all and was able to achieve great effects.
図面はこの発明高炉用羽口の実施例を示すものであって
、第1図は炭化硅素含有量とスラグ溶損量との関係を示
す図表、第2図はこの発明セット品の縦断面図、第3図
は従来のセラミックス管挿入羽口の縦断面図、第4図は
実施態様の本発明品1の斜視図、第5図は同本発明品2
の斜視図、第6図は従来品の斜視図である。
1.1a・・・羽口、2,2・・・水冷帯、3・・・S
iCセラミックス管、3a・・・ハイアルミナ質セラミ
ックス管、4・・・空障、5,5a・・・モルタルセッ
ト、6・・・セラミックス管外部補強部、7・・・セラ
ミックス管支持部、8・・・先端本体部、
第 4 図The drawings show an embodiment of the blast furnace tuyere according to the invention, in which Fig. 1 is a chart showing the relationship between silicon carbide content and slag erosion amount, and Fig. 2 is a longitudinal cross-sectional view of the set product of the invention. , FIG. 3 is a vertical cross-sectional view of a conventional ceramic tube insertion tuyere, FIG. 4 is a perspective view of an embodiment of the invention product 1, and FIG. 5 is a perspective view of the invention product 2.
FIG. 6 is a perspective view of a conventional product. 1.1a...Tuyere, 2,2...Water cooling zone, 3...S
iC ceramics tube, 3a... High alumina ceramics tube, 4... Air barrier, 5, 5a... Mortar set, 6... Ceramics tube external reinforcement part, 7... Ceramics tube support part, 8 ...Tip body part, Fig. 4
Claims (1)
てセラミックス管の先端部を20mm〜100mmと内
側層をSiC含有量90%以上で気孔率が3%〜17%
の品質特性値を有するセラミックス材で他の外表部を必
要ならば任意な型で任意な個所に補強及びセラミックス
管の支持部を設け、それ以外は金属製羽口との間に空障
を有する構造とすることを特徴とする高炉用羽口。In a tuyere made by inserting a ceramic tube inside the tuyere, the tip of the ceramic tube is 20 mm to 100 mm, and the inner layer has a SiC content of 90% or more and a porosity of 3% to 17%.
The other outer surface is made of ceramic material with quality characteristic values, and if necessary, reinforcement and support for the ceramic tube are provided in any place using any type, and otherwise there is an air barrier between it and the metal tuyere. A blast furnace tuyere characterized by a structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6018889A JP2779514B2 (en) | 1989-03-13 | 1989-03-13 | Tuyere for blast furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6018889A JP2779514B2 (en) | 1989-03-13 | 1989-03-13 | Tuyere for blast furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02240207A true JPH02240207A (en) | 1990-09-25 |
JP2779514B2 JP2779514B2 (en) | 1998-07-23 |
Family
ID=13134939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6018889A Expired - Lifetime JP2779514B2 (en) | 1989-03-13 | 1989-03-13 | Tuyere for blast furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2779514B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2633685C1 (en) * | 2016-12-20 | 2017-10-16 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Blast-furnace air tuyere |
RU182797U1 (en) * | 2018-05-14 | 2018-09-03 | Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский технологический университет "МИСиС" | Blast furnace air lance |
RU2686750C1 (en) * | 2018-06-26 | 2019-04-30 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method for installation of heat-insulating insert into blowing channel of air tuyere of blast furnace |
RU2756191C1 (en) * | 2020-12-18 | 2021-09-28 | Публичное акционерное общество «Северсталь» (ПАО «Северсталь») | Air tuyere of a blast furnace |
-
1989
- 1989-03-13 JP JP6018889A patent/JP2779514B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2779514B2 (en) | 1998-07-23 |
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